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<file_summary>
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<purpose>
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It is designed to be easily consumable by AI systems for analysis, code review,
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</purpose>

<file_format>
The content is organized as follows:
1. This summary section
2. Repository information
3. Directory structure
4. Repository files, each consisting of:
  - File path as an attribute
  - Full contents of the file
</file_format>

<usage_guidelines>
- This file should be treated as read-only. Any changes should be made to the
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  between different files in the repository.
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<notes>
- Some files may have been excluded based on .gitignore rules and Repomix's configuration
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</notes>

<additional_info>

</additional_info>

</file_summary>

<directory_structure>
.gitignore
Cargo.toml
src/auth.rs
src/db.rs
src/handlers.rs
src/main.rs
src/models.rs
</directory_structure>

<files>
This section contains the contents of the repository's files.

<file path=".gitignore">
/target
</file>

<file path="Cargo.toml">
[package]
name = "formies_be"
version = "0.1.0"
edition = "2021"

[dependencies]
actix-web = "4.0"
rusqlite = { version = "0.29", features = ["bundled", "chrono"] } 
serde = { version = "1.0", features = ["derive"] }
serde_json = "1.0"
uuid = { version = "1.0", features = ["v4"] }
actix-files = "0.6"
actix-cors = "0.6"
env_logger = "0.10"
log = "0.4"
futures = "0.3"
bcrypt = "0.13" 
anyhow = "1.0"
dotenv = "0.15.0"
chrono = { version = "0.4", features = ["serde"] } 
regex = "1"
url = "2"
</file>

<file path="src/auth.rs">
// src/auth.rs
use actix_web::error::{ErrorInternalServerError, ErrorUnauthorized}; // Specific error types
use actix_web::{
    dev::Payload, http::header::AUTHORIZATION, web, Error as ActixWebError, FromRequest,
    HttpRequest, Result as ActixResult,
};
use chrono::{Duration, Utc}; // Import chrono for time checks
use futures::future::{ready, Ready};
use log; // Use the log crate
use rusqlite::Connection;
use std::sync::{Arc, Mutex};

// Represents an authenticated user via token
pub struct Auth {
    pub user_id: String,
}

impl FromRequest for Auth {
    // Use actix_web::Error for consistency in error handling within Actix
    type Error = ActixWebError;
    // Use Ready from futures 0.3
    type Future = Ready<Result<Self, Self::Error>>;

    fn from_request(req: &HttpRequest, _: &mut Payload) -> Self::Future {
        // Extract database connection pool from application data
        // Replace .expect() with proper error handling
        let db_data_result = req.app_data::<web::Data<Arc<Mutex<Connection>>>>();

        let db_data = match db_data_result {
            Some(data) => data,
            None => {
                log::error!("Database connection missing in application data configuration.");
                return ready(Err(ErrorInternalServerError(
                    "Internal server error (app configuration)",
                )));
            }
        };

        // Extract Authorization header
        let auth_header = req.headers().get(AUTHORIZATION);

        if let Some(auth_header_value) = auth_header {
            // Convert header value to string
            if let Ok(auth_str) = auth_header_value.to_str() {
                // Check if it starts with "Bearer "
                if auth_str.starts_with("Bearer ") {
                    // Extract the token part
                    let token = &auth_str[7..];

                    // Lock the mutex to get access to the connection
                    // Handle potential mutex poisoning explicitly
                    let conn_guard = match db_data.lock() {
                        Ok(guard) => guard,
                        Err(poisoned) => {
                            log::error!("Database mutex poisoned: {}", poisoned);
                            // Return internal server error if mutex is poisoned
                            return ready(Err(ErrorInternalServerError(
                                "Internal server error (database lock)",
                            )));
                        }
                    };

                    // Validate the token against the database (now includes expiration check)
                    match super::db::validate_token(&conn_guard, token) {
                        // Token is valid and not expired, return Ok with Auth struct
                        Ok(Some(user_id)) => {
                            log::debug!("Token validated successfully for user_id: {}", user_id);
                            ready(Ok(Auth { user_id }))
                        }
                        // Token is invalid, not found, or expired
                        Ok(None) => {
                            log::warn!("Invalid or expired token received"); // Avoid logging token
                            ready(Err(ErrorUnauthorized("Invalid or expired token")))
                        }
                        // Database error during token validation
                        Err(e) => {
                            log::error!("Database error during token validation: {:?}", e);
                            // Return Unauthorized to avoid leaking internal error details
                            // Consider mapping specific DB errors if needed, but Unauthorized is generally safe
                            ready(Err(ErrorUnauthorized("Token validation failed")))
                        }
                    }
                } else {
                    // Header present but not "Bearer " format
                    log::warn!("Invalid Authorization header format (not Bearer)");
                    ready(Err(ErrorUnauthorized("Invalid token format")))
                }
            } else {
                // Header value contains invalid characters
                log::warn!("Authorization header contains invalid characters");
                ready(Err(ErrorUnauthorized("Invalid token value")))
            }
        } else {
            // Authorization header is missing
            log::warn!("Missing Authorization header");
            ready(Err(ErrorUnauthorized("Missing authorization token")))
        }
    }
}
</file>

<file path="src/db.rs">
// src/db.rs
use anyhow::{anyhow, Context, Result as AnyhowResult};
use bcrypt::{hash, verify, DEFAULT_COST};
use chrono::{Duration as ChronoDuration, Utc}; // Use Utc for timestamps
use log; // Use the log crate
use rusqlite::{
    params, types::Value as RusqliteValue, Connection, OptionalExtension, Result as RusqliteResult,
};
use std::env;
use uuid::Uuid;

use crate::models;

// Configurable token lifetime (e.g., from environment variable or default)
const TOKEN_LIFETIME_HOURS: i64 = 24; // Default to 24 hours

// Initialize the database connection and create tables if they don't exist
pub fn init_db(database_url: &str) -> AnyhowResult<Connection> {
    log::info!("Attempting to open or create database at: {}", database_url);
    let conn = Connection::open(database_url)
        .context(format!("Failed to open the database at {}", database_url))?;

    log::debug!("Creating 'users' table if not exists...");
    conn.execute(
        "CREATE TABLE IF NOT EXISTS users (
            id TEXT PRIMARY KEY,
            username TEXT NOT NULL UNIQUE,
            password TEXT NOT NULL,             -- Stores bcrypt hashed password
            token TEXT UNIQUE,                  -- Stores the current session token (UUID)
            token_expires_at DATETIME           -- Timestamp when the token expires
        )",
        [],
    )
    .context("Failed to create 'users' table")?;

    log::debug!("Creating 'forms' table if not exists...");
    // Storing complex form definitions as JSON blobs in TEXT columns is pragmatic
    // but sacrifices DB-level type safety and query capabilities. Ensure robust
    // application-level validation and consider backup strategies carefully.
    conn.execute(
        "CREATE TABLE IF NOT EXISTS forms (
            id TEXT PRIMARY KEY,
            name TEXT NOT NULL,
            fields TEXT NOT NULL, -- Stores JSON definition of form fields
            created_at DATETIME DEFAULT CURRENT_TIMESTAMP
        )",
        [],
    )
    .context("Failed to create 'forms' table")?;

    log::debug!("Creating 'submissions' table if not exists...");
    // Storing submission data as JSON blobs has similar tradeoffs as form fields.
    conn.execute(
        "CREATE TABLE IF NOT EXISTS submissions (
            id TEXT PRIMARY KEY,
            form_id TEXT NOT NULL,
            data TEXT NOT NULL,    -- Stores JSON submission data
            created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
            FOREIGN KEY (form_id) REFERENCES forms (id) ON DELETE CASCADE
        )",
        [],
    )
    .context("Failed to create 'submissions' table")?;

    // Setup the initial admin user if it doesn't exist, using environment variables
    setup_initial_admin(&conn).context("Failed to setup initial admin user")?;

    log::info!("Database initialization complete.");
    Ok(conn)
}

// Sets up the initial admin user from *required* environment variables if it doesn't exist
fn setup_initial_admin(conn: &Connection) -> AnyhowResult<()> {
    // CRITICAL SECURITY CHANGE: Remove default credentials. Require env vars.
    let initial_admin_username = env::var("INITIAL_ADMIN_USERNAME")
        .map_err(|_| anyhow!("FATAL: INITIAL_ADMIN_USERNAME environment variable is not set."))?;
    let initial_admin_password = env::var("INITIAL_ADMIN_PASSWORD")
        .map_err(|_| anyhow!("FATAL: INITIAL_ADMIN_PASSWORD environment variable is not set."))?;

    if initial_admin_username.is_empty() || initial_admin_password.is_empty() {
        return Err(anyhow!(
            "FATAL: INITIAL_ADMIN_USERNAME and INITIAL_ADMIN_PASSWORD must not be empty."
        ));
    }

    // Check password complexity? (Optional enhancement)

    add_user_if_not_exists(conn, &initial_admin_username, &initial_admin_password)
        .context("Failed during initial admin user setup")?;
    Ok(())
}

// Adds a user with a hashed password if the username doesn't exist
pub fn add_user_if_not_exists(
    conn: &Connection,
    username: &str,
    password: &str,
) -> AnyhowResult<bool> {
    // Check if user already exists
    let user_exists: bool = conn
        .query_row(
            "SELECT EXISTS(SELECT 1 FROM users WHERE username = ?1)",
            params![username],
            |row| row.get::<_, i32>(0),
        )
        .context(format!("Failed to check existence of user '{}'", username))?
        == 1;

    if user_exists {
        log::debug!("User '{}' already exists, skipping creation.", username);
        return Ok(false); // User already exists, nothing added
    }

    // Generate a UUID for the new user
    let user_id = Uuid::new_v4().to_string();

    // Hash the password using bcrypt
    // Ensure the cost factor is appropriate for your security needs and hardware.
    // Higher cost means slower hashing and verification, but better resistance to brute-force.
    log::debug!(
        "Hashing password for user '{}' with cost {}",
        username,
        DEFAULT_COST
    );
    let hashed_password = hash(password, DEFAULT_COST).context("Failed to hash password")?;

    // Insert the new user (token and expiry are initially NULL)
    log::info!("Creating new user '{}' with ID: {}", username, user_id);
    conn.execute(
        "INSERT INTO users (id, username, password) VALUES (?1, ?2, ?3)",
        params![user_id, username, hashed_password],
    )
    .context(format!("Failed to insert user '{}'", username))?;

    Ok(true) // User was added
}

// Validate a session token and return the associated user ID if valid and not expired
pub fn validate_token(conn: &Connection, token: &str) -> AnyhowResult<Option<String>> {
    log::debug!("Validating received token (existence and expiration)...");
    let mut stmt = conn.prepare(
        // Select user ID only if token matches AND it hasn't expired
        "SELECT id FROM users WHERE token = ?1 AND token_expires_at IS NOT NULL AND token_expires_at > ?2"
    ).context("Failed to prepare query for validating token")?;

    let now_ts = Utc::now().to_rfc3339(); // Use ISO 8601 / RFC 3339 format compatible with SQLite DATETIME

    let user_id_option: Option<String> = stmt
        .query_row(params![token, now_ts], |row| row.get(0))
        .optional() // Makes it return Option instead of erroring on no rows
        .context("Failed to execute query for validating token")?;

    if user_id_option.is_some() {
        log::debug!("Token validation successful.");
    } else {
        // This covers token not found OR token expired
        log::debug!("Token validation failed (token not found or expired).");
    }

    Ok(user_id_option)
}

// Invalidate a user's token (e.g., on logout) by setting it to NULL and clearing expiration
pub fn invalidate_token(conn: &Connection, user_id: &str) -> AnyhowResult<()> {
    log::debug!("Invalidating token for user_id {}", user_id);
    conn.execute(
        "UPDATE users SET token = NULL, token_expires_at = NULL WHERE id = ?1",
        params![user_id],
    )
    .context(format!(
        "Failed to invalidate token for user_id {}",
        user_id
    ))?;
    Ok(())
}

// Authenticate a user by username and password, returning user ID and hash if successful
pub fn authenticate_user(
    conn: &Connection,
    username: &str,
    password: &str,
) -> AnyhowResult<Option<models::UserAuthData>> {
    log::debug!("Attempting to authenticate user: {}", username);
    let mut stmt = conn
        .prepare("SELECT id, password FROM users WHERE username = ?1")
        .context("Failed to prepare query for authenticating user")?;

    let result = stmt
        .query_row(params![username], |row| {
            Ok(models::UserAuthData {
                id: row.get(0)?,
                hashed_password: row.get(1)?,
            })
        })
        .optional()
        .context(format!(
            "Failed to execute query to fetch auth data for user '{}'",
            username
        ))?;

    match result {
        Some(user_data) => {
            // Verify the provided password against the stored hash
            let is_valid = verify(password, &user_data.hashed_password)
                .context("Failed to verify password hash")?;

            if is_valid {
                log::info!("Authentication successful for user: {}", username);
                Ok(Some(user_data)) // Return user ID and hash
            } else {
                log::warn!(
                    "Authentication failed for user '{}' (invalid password)",
                    username
                );
                Ok(None) // Invalid password
            }
        }
        None => {
            log::warn!(
                "Authentication failed for user '{}' (user not found)",
                username
            );
            Ok(None) // User not found
        }
    }
}

// Generate and save a new session token (with expiration) for a user
pub fn generate_and_set_token_for_user(conn: &Connection, user_id: &str) -> AnyhowResult<String> {
    let new_token = Uuid::new_v4().to_string();
    // Calculate expiration time
    let expires_at = Utc::now() + ChronoDuration::hours(TOKEN_LIFETIME_HOURS);
    let expires_at_ts = expires_at.to_rfc3339(); // Store as string

    log::debug!(
        "Generating new token for user_id {} expiring at {}",
        user_id,
        expires_at_ts
    );

    conn.execute(
        "UPDATE users SET token = ?1, token_expires_at = ?2 WHERE id = ?3",
        params![new_token, expires_at_ts, user_id],
    )
    .context(format!("Failed to update token for user_id {}", user_id))?;

    Ok(new_token)
}

// Fetch a specific form definition by its ID
pub fn get_form_definition(conn: &Connection, form_id: &str) -> AnyhowResult<Option<models::Form>> {
    let mut stmt = conn
        .prepare("SELECT id, name, fields FROM forms WHERE id = ?1")
        .context("Failed to prepare statement for getting form definition")?;

    let form_option = stmt
        .query_row(params![form_id], |row| {
            let id: String = row.get(0)?;
            let name: String = row.get(1)?;
            let fields_str: String = row.get(2)?;

            // Ensure fields can be parsed as valid JSON Value
            let fields: serde_json::Value = serde_json::from_str(&fields_str).map_err(|e| {
                // Log clearly that this is a data integrity issue
                log::error!(
                    "Database integrity error: Failed to parse 'fields' JSON for form_id {}: {}. Content: '{}'",
                    id, e, fields_str // Log content if not too large/sensitive
                );
                rusqlite::Error::FromSqlConversionFailure(
                    2,
                    rusqlite::types::Type::Text,
                    Box::new(e),
                )
            })?;

            // **Basic check**: Ensure fields is an array (common pattern for form definitions)
            if !fields.is_array() {
                log::error!(
                    "Database integrity error: 'fields' column for form_id {} is not a JSON array.",
                    id
                );
                return Err(rusqlite::Error::FromSqlConversionFailure(
                    2,
                    rusqlite::types::Type::Text,
                    "Form fields definition is not a valid JSON array".into(),
                ));
            }

            Ok(models::Form {
                id: Some(id),
                name,
                fields,
            })
        })
        .optional() // Handle case where form_id doesn't exist
        .context(format!(
            "Failed to execute query for form definition with id {}",
            form_id
        ))?;

    Ok(form_option)
}
</file>

<file path="src/handlers.rs">
// src/handlers.rs
use crate::auth::Auth;
use crate::models::{Form, LoginCredentials, LoginResponse, Submission};
use actix_web::{web, Error as ActixWebError, HttpResponse, Responder, Result as ActixResult};
use anyhow::Context; // Import anyhow::Context for error chaining
use log;
use regex::Regex; // For pattern validation
use rusqlite::{params, Connection};
use serde_json::{json, Map, Value as JsonValue}; // Alias for clarity
use std::collections::HashMap;
use std::error::Error as StdError;
use std::sync::{Arc, Mutex};
use uuid::Uuid;

// --- Helper Function for Database Access ---

// Gets a database connection from the request data, handling lock errors consistently.
fn get_db_conn(
    db: &web::Data<Arc<Mutex<Connection>>>,
) -> Result<std::sync::MutexGuard<'_, Connection>, ActixWebError> {
    db.lock().map_err(|poisoned| {
        log::error!("Database mutex poisoned: {}", poisoned);
        actix_web::error::ErrorInternalServerError("Internal database error (mutex lock)")
    })
}

// --- Helper Function for Validation ---

/// Validates submission data against the form field definitions with enhanced checks.
///
/// Expected field definition properties:
/// - `name`: string (required)
/// - `type`: string (e.g., "string", "number", "boolean", "email", "url", "object", "array") (required)
/// - `required`: boolean (optional, default: false)
/// - `maxLength`: number (for "string" type)
/// - `minLength`: number (for "string" type)
/// - `min`: number (for "number" type)
/// - `max`: number (for "number" type)
/// - `pattern`: string (regex for "string", "email", "url" types)
///
/// Returns `Ok(())` if valid, or `Err(JsonValue)` containing validation errors.
fn validate_submission_against_definition(
    submission_data: &JsonValue,
    form_definition_fields: &JsonValue,
) -> Result<(), JsonValue> {
    let mut errors: HashMap<String, String> = HashMap::new();

    // Ensure 'fields' in the definition is a JSON array
    let field_definitions = match form_definition_fields.as_array() {
        Some(defs) => defs,
        None => {
            log::error!(
                "Form definition 'fields' is not a JSON array. Def: {:?}",
                form_definition_fields
            );
            errors.insert(
                "_internal".to_string(),
                "Invalid form definition format (not an array)".to_string(),
            );
            return Err(json!({ "validation_errors": errors }));
        }
    };

    // Ensure the submission data is a JSON object
    let data_map = match submission_data.as_object() {
        Some(map) => map,
        None => {
            errors.insert(
                "_submission".to_string(),
                "Submission data must be a JSON object".to_string(),
            );
            return Err(json!({ "validation_errors": errors }));
        }
    };

    // Build a map of valid field names to their definitions from the definition for quick lookup
    let defined_field_names: HashMap<String, &Map<String, JsonValue>> = field_definitions
        .iter()
        .filter_map(|val| val.as_object())
        .filter_map(|def| {
            def.get("name")
                .and_then(JsonValue::as_str)
                .map(|name| (name.to_string(), def))
        })
        .collect();

    // 1. Check for submitted fields that are NOT in the definition
    for submitted_key in data_map.keys() {
        if !defined_field_names.contains_key(submitted_key) {
            errors.insert(
                submitted_key.clone(),
                "Unexpected field submitted".to_string(),
            );
        }
    }
    // Exit early if unexpected fields were found
    if !errors.is_empty() {
        log::warn!("Submission validation failed: Unexpected fields submitted.");
        return Err(json!({ "validation_errors": errors }));
    }

    // 2. Iterate through each field definition and validate corresponding submitted data
    for (field_name, field_def) in &defined_field_names {
        // Extract properties using helper functions for clarity
        let field_type = field_def
            .get("type")
            .and_then(JsonValue::as_str)
            .unwrap_or("string"); // Default to "string" if type is missing or not a string
        let is_required = field_def
            .get("required")
            .and_then(JsonValue::as_bool)
            .unwrap_or(false); // Default to false if required is missing or not a boolean
        let min_length = field_def.get("minLength").and_then(JsonValue::as_u64);
        let max_length = field_def.get("maxLength").and_then(JsonValue::as_u64);
        let min_value = field_def.get("min").and_then(JsonValue::as_f64); // Use f64 for flexibility
        let max_value = field_def.get("max").and_then(JsonValue::as_f64);
        let pattern = field_def.get("pattern").and_then(JsonValue::as_str);

        match data_map.get(field_name) {
            Some(submitted_value) if !submitted_value.is_null() => {
                // Field is present and not null, perform type and constraint checks
                let mut type_error = None;
                let mut constraint_errors = vec![];

                match field_type {
                    "string" | "email" | "url" => {
                        if let Some(s) = submitted_value.as_str() {
                            if let Some(min) = min_length {
                                if (s.chars().count() as u64) < min {
                                    // Use chars().count() for UTF-8 correctness
                                    constraint_errors
                                        .push(format!("Must be at least {} characters long", min));
                                }
                            }
                            if let Some(max) = max_length {
                                if (s.chars().count() as u64) > max {
                                    constraint_errors.push(format!(
                                        "Must be no more than {} characters long",
                                        max
                                    ));
                                }
                            }
                            if let Some(pat) = pattern {
                                // Consider caching compiled Regex if performance is critical
                                // and patterns are reused frequently across requests.
                                match Regex::new(pat) {
                                    Ok(re) => {
                                        if !re.is_match(s) {
                                           constraint_errors.push(format!("Does not match required pattern"));
                                        }
                                    }
                                    Err(e) => log::warn!("Invalid regex pattern '{}' in form definition for field '{}': {}", pat, field_name, e), // Log regex compilation error
                                }
                            }
                            // Specific checks for email/url
                            if field_type == "email" {
                                // Basic email regex (adjust for stricter needs or use a validation crate)
                                // This regex is very basic and allows many technically invalid addresses.
                                // Consider crates like `validator` for more robust validation.
                                let email_regex =
                                    Regex::new(r"^[^\s@]+@[^\s@]+\.[^\s@]+$").unwrap(); // Safe unwrap for known valid regex
                                if !email_regex.is_match(s) {
                                    constraint_errors
                                        .push("Must be a valid email address".to_string());
                                }
                            }
                            if field_type == "url" {
                                // Basic URL check (consider `url` crate for robustness)
                                if url::Url::parse(s).is_err() {
                                    constraint_errors.push("Must be a valid URL".to_string());
                                }
                            }
                        } else {
                            type_error = Some(format!("Expected a string for '{}'", field_name));
                        }
                    }
                    "number" => {
                        // Use as_f64 for flexibility (handles integers and floats)
                        if let Some(num) = submitted_value.as_f64() {
                            if let Some(min) = min_value {
                                if num < min {
                                    constraint_errors.push(format!("Must be at least {}", min));
                                }
                            }
                            if let Some(max) = max_value {
                                if num > max {
                                    constraint_errors.push(format!("Must be no more than {}", max));
                                }
                            }
                        } else {
                            type_error = Some(format!("Expected a number for '{}'", field_name));
                        }
                    }
                    "boolean" => {
                        if !submitted_value.is_boolean() {
                            type_error = Some(format!(
                                "Expected a boolean (true/false) for '{}'",
                                field_name
                            ));
                        }
                    }
                    "object" => {
                        if !submitted_value.is_object() {
                            type_error =
                                Some(format!("Expected a JSON object for '{}'", field_name));
                        }
                        // TODO: Could add deeper validation for object structure here if needed based on definition
                    }
                    "array" => {
                        if !submitted_value.is_array() {
                            type_error =
                                Some(format!("Expected a JSON array for '{}'", field_name));
                        }
                        // TODO: Could add validation for array elements here if needed based on definition
                    }
                    _ => {
                        // Log unsupported types during development/debugging if necessary
                        log::trace!(
                            "Unsupported field type '{}' encountered during validation for field '{}'. Treating as valid.",
                            field_type,
                            field_name
                        );
                        // Assume valid if type is not specifically handled or unknown
                    }
                }

                // Record errors found for this field
                if let Some(err) = type_error {
                    errors.insert(field_name.clone(), err);
                } else if !constraint_errors.is_empty() {
                    // Combine multiple constraint errors if necessary
                    errors.insert(field_name.clone(), constraint_errors.join("; "));
                }
            } // End check for present and non-null value
            Some(_) => {
                // Value is present but explicitly null (e.g., "fieldName": null)
                if is_required {
                    errors.insert(
                        field_name.clone(),
                        "This field is required and cannot be null".to_string(),
                    );
                }
                // Otherwise, null is considered a valid (empty) value for non-required fields
            }
            None => {
                // Field is missing entirely from the submission object
                if is_required {
                    errors.insert(field_name.clone(), "This field is required".to_string());
                }
                // Missing is valid for non-required fields
            }
        } // End match data_map.get(field_name)
    } // End loop through field definitions

    // Check if any errors were collected
    if errors.is_empty() {
        Ok(()) // Validation passed
    } else {
        log::info!(
            "Submission validation failed with {} error(s).", // Log only the count for brevity
            errors.len()
        );
        // Return a JSON object containing the specific validation errors
        Err(json!({ "validation_errors": errors }))
    }
}

// Helper function to convert anyhow::Error to actix_web::Error
fn anyhow_to_actix_error(e: anyhow::Error) -> ActixWebError {
    actix_web::error::ErrorInternalServerError(e.to_string())
}

// --- Public Handlers ---

// POST /login
pub async fn login(
    db: web::Data<Arc<Mutex<Connection>>>,
    creds: web::Json<LoginCredentials>,
) -> ActixResult<impl Responder> {
    let db_conn = db.clone(); // Clone Arc for use in web::block
    let username = creds.username.clone();
    let password = creds.password.clone();

    // Wrap the blocking database operations in web::block
    let auth_result = web::block(move || {
        let conn = db_conn
            .lock()
            .map_err(|_| anyhow::anyhow!("Database mutex poisoned during login lock"))?;
        crate::db::authenticate_user(&conn, &username, &password)
    })
    .await
    .map_err(|e| {
        log::error!("web::block error during authentication: {:?}", e);
        actix_web::error::ErrorInternalServerError("Authentication process failed (blocking error)")
    })?
    .map_err(anyhow_to_actix_error)?;

    match auth_result {
        Some(user_data) => {
            let db_conn_token = db.clone(); // Clone Arc again for token generation
            let user_id = user_data.id.clone();

            // Generate and store a new token within web::block
            let token = web::block(move || {
                let conn = db_conn_token
                    .lock()
                    .map_err(|_| anyhow::anyhow!("Database mutex poisoned during token lock"))?;
                crate::db::generate_and_set_token_for_user(&conn, &user_id)
            })
            .await
            .map_err(|e| {
                log::error!("web::block error during token generation: {:?}", e);
                actix_web::error::ErrorInternalServerError(
                    "Failed to complete login (token generation blocking error)",
                )
            })?
            .map_err(anyhow_to_actix_error)?;

            log::info!("Login successful for user_id: {}", user_data.id);
            Ok(HttpResponse::Ok().json(LoginResponse { token }))
        }
        None => {
            log::warn!("Login failed for username: {}", creds.username);
            // Return 401 Unauthorized for failed login attempts
            Err(actix_web::error::ErrorUnauthorized(
                "Invalid username or password",
            ))
        }
    }
}

// POST /logout
pub async fn logout(
    db: web::Data<Arc<Mutex<Connection>>>,
    auth: Auth, // Requires authentication (extracts user_id from token)
) -> ActixResult<impl Responder> {
    log::info!("User {} requesting logout", auth.user_id);
    let db_conn = db.clone();
    let user_id = auth.user_id.clone();

    // Invalidate the token in the database within web::block
    web::block(move || {
        let conn = db_conn
            .lock()
            .map_err(|_| anyhow::anyhow!("Database mutex poisoned during logout lock"))?;
        crate::db::invalidate_token(&conn, &user_id)
    })
    .await
    .map_err(|e| {
        let user_id = auth.user_id.clone(); // Clone user_id again after the move
        log::error!(
            "web::block error during logout for user {}: {:?}",
            user_id,
            e
        );
        actix_web::error::ErrorInternalServerError("Logout failed (blocking error)")
    })?
    .map_err(anyhow_to_actix_error)?;

    log::info!("User {} logged out successfully", auth.user_id);
    Ok(HttpResponse::Ok().json(json!({ "message": "Logged out successfully" })))
}

// POST /forms/{form_id}/submissions
pub async fn submit_form(
    db: web::Data<Arc<Mutex<Connection>>>,
    path: web::Path<String>,                  // Extracts form_id from path
    submission_payload: web::Json<JsonValue>, // Expect arbitrary JSON payload
) -> ActixResult<impl Responder> {
    let form_id = path.into_inner();
    let submission_data = submission_payload.into_inner(); // Get the JSON data

    // --- Stage 1: Fetch form definition (Read-only, can use shared lock) ---
    let form_definition = {
        // Acquire lock temporarily for the read operation
        let conn = get_db_conn(&db)?;
        match crate::db::get_form_definition(&conn, &form_id) {
            Ok(Some(form)) => form,
            Ok(None) => {
                log::warn!("Submission attempt for non-existent form_id: {}", form_id);
                return Err(actix_web::error::ErrorNotFound("Form not found"));
            }
            Err(e) => {
                log::error!("Failed to fetch form definition for {}: {:?}", form_id, e);
                return Err(actix_web::error::ErrorInternalServerError(
                    "Could not retrieve form information",
                ));
            }
        }
        // Lock is released here when 'conn' goes out of scope
    };

    // --- Stage 2: Validate submission against definition (CPU-bound, no DB lock needed) ---
    if let Err(validation_errors) =
        validate_submission_against_definition(&submission_data, &form_definition.fields)
    {
        log::warn!(
            "Submission validation failed for form_id {}. Errors: {:?}", // Log actual errors if needed (might be verbose)
            form_id,
            validation_errors
        );
        // Return 400 Bad Request with validation error details
        return Ok(HttpResponse::BadRequest().json(validation_errors));
    }

    // --- Stage 3: Serialize validated data and Insert submission (Write operation, use web::block) ---
    let submission_json = match serde_json::to_string(&submission_data) {
        Ok(json_string) => json_string,
        Err(e) => {
            log::error!(
                "Failed to serialize validated submission data for form {}: {}",
                form_id,
                e
            );
            return Err(actix_web::error::ErrorInternalServerError(
                "Failed to process submission data internally",
            ));
        }
    };

    let db_conn_write = db.clone(); // Clone Arc for the blocking operation
    let form_id_clone = form_id.clone(); // Clone for closure
    let submission_id = Uuid::new_v4().to_string(); // Generate unique ID for the submission
    let submission_id_clone = submission_id.clone(); // Clone for closure

    web::block(move || {
        let conn = db_conn_write.lock().map_err(|_| {
            anyhow::anyhow!("Database mutex poisoned during submission insert lock")
        })?;
        conn.execute(
            "INSERT INTO submissions (id, form_id, data) VALUES (?1, ?2, ?3)",
            params![submission_id_clone, form_id_clone, submission_json],
        )
        .context(format!(
            "Failed to insert submission for form {}",
            form_id_clone
        ))
        .map_err(anyhow::Error::from)
    })
    .await
    .map_err(|e| {
        log::error!(
            "web::block error during submission insertion for form {}: {:?}",
            form_id,
            e
        );
        actix_web::error::ErrorInternalServerError("Failed to save submission (blocking error)")
    })?
    .map_err(anyhow_to_actix_error)?;

    log::info!(
        "Successfully inserted submission {} for form_id {}",
        submission_id,
        form_id
    );
    // Return 200 OK with the new submission ID
    Ok(HttpResponse::Ok().json(json!({ "submission_id": submission_id })))
}

// --- Protected Handlers (Require Auth) ---

// POST /forms
pub async fn create_form(
    db: web::Data<Arc<Mutex<Connection>>>,
    auth: Auth, // Authentication check via Auth extractor
    form_payload: web::Json<Form>,
) -> ActixResult<impl Responder> {
    log::info!(
        "User {} attempting to create form: {}",
        auth.user_id,
        form_payload.name
    );

    let mut form = form_payload.into_inner();
    // Generate a new UUID for the form if not provided (or overwrite if provided)
    let form_id = form.id.unwrap_or_else(|| Uuid::new_v4().to_string());
    form.id = Some(form_id.clone()); // Ensure the form object has the ID

    // Basic structural validation: Ensure 'fields' is a JSON array before serialization/saving
    if !form.fields.is_array() {
        log::error!(
            "User {} attempted to create form '{}' ('{}') where 'fields' is not a JSON array.",
            auth.user_id,
            form.name,
            form_id
        );
        return Err(actix_web::error::ErrorBadRequest(
            "Form 'fields' must be a valid JSON array.",
        ));
    }
    // TODO: Add deeper validation of the 'fields' structure itself if needed
    // e.g., check if each element in 'fields' is an object with 'name' and 'type'.

    // Serialize the fields part to JSON string for DB storage
    let fields_json = match serde_json::to_string(&form.fields) {
        Ok(json_str) => json_str,
        Err(e) => {
            log::error!(
                "Failed to serialize form fields for form '{}' ('{}') by user {}: {}",
                form.name,
                form_id,
                auth.user_id,
                e
            );
            return Err(actix_web::error::ErrorInternalServerError(
                "Failed to process form fields internally",
            ));
        }
    };

    // Clone data needed for the blocking database operation
    let db_conn = db.clone();
    // let form_id = form_id; // Already have it from above
    let form_name = form.name.clone();
    let user_id = auth.user_id.clone(); // For logging inside block if needed

    // Insert the form using web::block for the blocking DB write
    web::block(move || {
        let conn = db_conn
            .lock()
            .map_err(|_| anyhow::anyhow!("Database mutex poisoned during form creation lock"))?;
        conn.execute(
            // Consider adding user_id to the forms table if forms are user-specific
            "INSERT INTO forms (id, name, fields) VALUES (?1, ?2, ?3)",
            params![form_id, form_name, fields_json],
        )
        .context("Failed to insert new form into database")
        .map_err(anyhow::Error::from)
    })
    .await
    .map_err(|e| {
        log::error!(
            "web::block error during form creation by user {}: {:?}",
            auth.user_id,
            e
        );
        actix_web::error::ErrorInternalServerError("Failed to create form (blocking error)")
    })?
    .map_err(anyhow_to_actix_error)?;

    log::info!(
        "Successfully created form '{}' with id {} by user {}",
        form.name,
        form.id.as_ref().unwrap(), // Safe unwrap as we set it
        auth.user_id
    );
    // Return 200 OK with the newly created form object (including its ID)
    Ok(HttpResponse::Ok().json(form))
}

// GET /forms
pub async fn get_forms(
    db: web::Data<Arc<Mutex<Connection>>>,
    auth: Auth, // Requires authentication
) -> ActixResult<impl Responder> {
    log::info!("User {} requesting list of forms", auth.user_id);
    let db_conn = db.clone();
    let user_id = auth.user_id.clone(); // Clone for logging context if needed inside block

    // Wrap DB query in web::block as it might be slow with many forms or complex parsing
    let forms_result = web::block(move || {
        let conn = db_conn
            .lock()
            .map_err(|_| anyhow::anyhow!("Database mutex poisoned during get_forms lock"))?;

        let mut stmt = conn
            .prepare("SELECT id, name, fields FROM forms")
            .context("Failed to prepare statement for getting forms")?;

        let forms_iter = stmt
            .query_map([], |row| {
                let id: String = row.get(0)?;
                let name: String = row.get(1)?;
                let fields_str: String = row.get(2)?;

                // Parse the 'fields' JSON string. If it fails, log the error and skip the row.
                let fields: serde_json::Value = match serde_json::from_str(&fields_str) {
                    Ok(json_value) => json_value,
                    Err(e) => {
                        // Log the data integrity issue clearly
                        log::error!(
                            "DB Parse Error: Failed to parse 'fields' JSON for form id {}: {}. Skipping this form.",
                             id, e
                        );
                        // Return a special error that `filter_map` below can catch,
                        // without failing the entire query_map.
                        // Using a specific rusqlite error type here is okay.
                        return Err(rusqlite::Error::FromSqlConversionFailure(
                            2, // Column index
                            rusqlite::types::Type::Text,
                            Box::new(e) // Box the original error
                        ));
                    }
                };

                Ok(Form { id: Some(id), name, fields })
            })
            .context("Failed to execute query map for getting forms")?;

        // Collect results, filtering out rows that failed parsing WITHIN the block
        let forms: Vec<Form> = forms_iter
            .filter_map(|result| match result {
                Ok(form) => Some(form),
                Err(e) => {
                    // Error was already logged inside the query_map closure.
                    // We just filter out the failed row here.
                    log::warn!("Skipping a form row due to a processing error: {}", e);
                    None // Skip this row
                }
            })
            .collect();

        Ok::<_, anyhow::Error>(forms) // Ensure block returns Result compatible with flattening
    })
    .await
    .map_err(|e| {
        // Handle web::block error
        log::error!("web::block error during get_forms for user {}: {:?}", user_id, e);
        actix_web::error::ErrorInternalServerError("Failed to retrieve forms (blocking error)")
    })?
    .map_err(anyhow_to_actix_error)?; // Flatten Result<Result<Vec<Form>, anyhow::Error>, BlockingError>

    log::debug!(
        "Returning {} forms for user {}",
        forms_result.len(),
        auth.user_id
    );
    Ok(HttpResponse::Ok().json(forms_result))
}

// GET /forms/{form_id}/submissions
pub async fn get_submissions(
    db: web::Data<Arc<Mutex<Connection>>>,
    auth: Auth,              // Requires authentication
    path: web::Path<String>, // Extracts form_id from the path
) -> ActixResult<impl Responder> {
    let form_id = path.into_inner();
    log::info!(
        "User {} requesting submissions for form_id: {}",
        auth.user_id,
        form_id
    );

    let db_conn = db.clone();
    let form_id_clone = form_id.clone();
    let user_id = auth.user_id.clone(); // Clone for logging context

    // Wrap DB queries (existence check + fetching submissions) in web::block
    let submissions_result = web::block(move || {
        let conn = db_conn
            .lock()
            .map_err(|_| anyhow::anyhow!("Database mutex poisoned during get_submissions lock"))?;

        // 1. Check if the form exists first
        let form_exists: bool = match conn.query_row(
            "SELECT EXISTS(SELECT 1 FROM forms WHERE id = ?1 LIMIT 1)", // Added LIMIT 1 for potential optimization
            params![form_id_clone],
            |row| row.get::<_, i32>(0), // sqlite returns 0 or 1 for EXISTS
        ) {
            Ok(count) => count == 1,
            Err(rusqlite::Error::QueryReturnedNoRows) => false, // Should not happen with EXISTS, but handle defensively
            Err(e) => return Err(anyhow::Error::from(e) // Propagate other DB errors
                .context(format!("Failed check existence of form {}", form_id_clone))),
        };

        if !form_exists {
             // Use Ok(None) to signal "form not found" to the calling async context
            return Ok(None);
        }

        // 2. If form exists, fetch its submissions
        let mut stmt = conn.prepare(
                "SELECT id, form_id, data, created_at FROM submissions WHERE form_id = ?1 ORDER BY created_at DESC", // Include created_at if needed
            )
            .context(format!("Failed to prepare statement for getting submissions for form {}", form_id_clone))?;

        let submissions_iter = stmt
            .query_map(params![form_id_clone], |row| {
                let id: String = row.get(0)?;
                let form_id_db: String = row.get(1)?;
                let data_str: String = row.get(2)?;
                // let created_at: String = row.get(3)?; // Example: If you fetch created_at

                // Parse the 'data' JSON string, handling potential errors
                let data: serde_json::Value = match serde_json::from_str(&data_str) {
                    Ok(json_value) => json_value,
                    Err(e) => {
                         log::error!(
                            "DB Parse Error: Failed to parse 'data' JSON for submission_id {}: {}. Skipping.",
                            id, e
                        );
                        // Return specific error for filter_map
                        return Err(rusqlite::Error::FromSqlConversionFailure(
                            2, rusqlite::types::Type::Text, Box::new(e)
                        ));
                    }
                };

                Ok(Submission { id, form_id: form_id_db, data }) // Add created_at if fetched
            })
             .context(format!("Failed to execute query map for getting submissions for form {}", form_id_clone))?;

        // Collect valid submissions, filtering out rows that failed parsing
        let submissions: Vec<Submission> = submissions_iter
            .filter_map(|result| match result {
                Ok(submission) => Some(submission),
                Err(e) => {
                    log::warn!("Skipping a submission row due to processing error: {}", e);
                    None // Skip this row
                }
            })
            .collect();

        Ok(Some(submissions)) // Indicate success with the (potentially empty) list of submissions

    })
    .await
    .map_err(|e| { // Handle web::block error (cancellation, panic)
        log::error!("web::block error during get_submissions for form {} by user {}: {:?}", form_id, user_id, e);
        actix_web::error::ErrorInternalServerError("Failed to retrieve submissions (blocking error)")
    })?
    .map_err(anyhow_to_actix_error)?; // Flatten Result<Result<Option<Vec<Submission>>, anyhow::Error>, BlockingError>

    // Process the result obtained from the web::block
    match submissions_result {
        Some(submissions) => {
            // Form exists, return the found submissions (might be an empty list)
            log::debug!(
                "Returning {} submissions for form {} requested by user {}",
                submissions.len(),
                form_id,
                auth.user_id
            );
            Ok(HttpResponse::Ok().json(submissions))
        }
        None => {
            // Form was not found (signaled by Ok(None) from the block)
            log::warn!(
                "Attempt by user {} to get submissions for non-existent form_id: {}",
                auth.user_id,
                form_id
            );
            Err(actix_web::error::ErrorNotFound("Form not found"))
        }
    }
}
</file>

<file path="src/main.rs">
// src/main.rs
use actix_cors::Cors;
use actix_files as fs;
use actix_web::{http::header, middleware::Logger, web, App, HttpServer}; // Added Logger explicitly
use dotenv::dotenv;
use log;
use std::env;
use std::io::Result as IoResult; // Alias for clarity
use std::process;
use std::sync::{Arc, Mutex};

// Import modules
mod auth;
mod db;
mod handlers;
mod models;

#[actix_web::main]
async fn main() -> IoResult<()> {
    dotenv().ok(); // Load .env file

    // Initialize logger (using RUST_LOG env var)
    env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("info")).init();

    // --- Configuration (Environment Variables) ---
    // CRITICAL: Database URL is required
    let database_url = env::var("DATABASE_URL").unwrap_or_else(|_| {
        log::warn!("DATABASE_URL environment variable not set. Defaulting to 'form_data.db'.");
        "form_data.db".to_string()
    });
    // CRITICAL: Bind address is required
    let bind_address = env::var("BIND_ADDRESS").unwrap_or_else(|_| {
        log::warn!("BIND_ADDRESS environment variable not set. Defaulting to '127.0.0.1:8080'.");
        "127.0.0.1:8080".to_string()
    });
    // CRITICAL: Initial admin credentials (checked in db::init_db)
    // let initial_admin_username = env::var("INITIAL_ADMIN_USERNAME").expect("Missing INITIAL_ADMIN_USERNAME");
    // let initial_admin_password = env::var("INITIAL_ADMIN_PASSWORD").expect("Missing INITIAL_ADMIN_PASSWORD");
    // OPTIONAL: Allowed origin for CORS
    let allowed_origin = env::var("ALLOWED_ORIGIN").ok(); // Use ok() to make it optional

    log::info!(" --- Formies Backend Configuration ---");
    log::info!("Required Environment Variables:");
    log::info!(" - DATABASE_URL (Current: {})", database_url);
    log::info!(" - BIND_ADDRESS (Current: {})", bind_address);
    log::info!(" - INITIAL_ADMIN_USERNAME (Set during startup, MUST be present)");
    log::info!(" - INITIAL_ADMIN_PASSWORD (Set during startup, MUST be present)");
    log::info!("Optional Environment Variables:");
    if let Some(ref origin) = allowed_origin {
        log::info!(" - ALLOWED_ORIGIN (Set: {})", origin);
    } else {
        log::warn!(" - ALLOWED_ORIGIN (Not Set): CORS will be restrictive, potentially blocking browser access. Set to your frontend URL (e.g., http://localhost:5173 or https://yourdomain.com).");
    }
    log::info!(" - RUST_LOG (e.g., 'info,formies_be=debug')");
    log::info!(" --- End Configuration ---");

    // Initialize database connection
    let db_connection = match db::init_db(&database_url) {
        Ok(conn) => conn,
        Err(e) => {
            // Specific check for missing admin credentials error
            if e.to_string().contains("INITIAL_ADMIN_USERNAME")
                || e.to_string().contains("INITIAL_ADMIN_PASSWORD")
            {
                log::error!("FATAL: {}", e);
                log::error!("Please set the INITIAL_ADMIN_USERNAME and INITIAL_ADMIN_PASSWORD environment variables.");
            } else {
                log::error!(
                    "FATAL: Failed to initialize database at {}: {:?}",
                    database_url,
                    e
                );
            }
            process::exit(1); // Exit if DB initialization fails
        }
    };

    // Wrap connection in Arc<Mutex<>> for thread-safe sharing
    let db_data = web::Data::new(Arc::new(Mutex::new(db_connection)));

    log::info!("Starting server at http://{}", bind_address);

    HttpServer::new(move || {
        // Clone shared state for the closure
        let db_data_clone = db_data.clone();
        let allowed_origin_clone = allowed_origin.clone();

        // Configure CORS
        let cors = match allowed_origin_clone {
            Some(origin) => {
                log::info!("Configuring CORS for specific origin: {}", origin);
                Cors::default()
                    .allowed_origin(&origin) // Allow only the specified origin
                    .allowed_methods(vec!["GET", "POST", "PUT", "DELETE", "OPTIONS"])
                    .allowed_headers(vec![
                        header::AUTHORIZATION,
                        header::ACCEPT,
                        header::CONTENT_TYPE,
                        header::ORIGIN, // Add Origin header if needed
                        header::ACCESS_CONTROL_REQUEST_METHOD,
                        header::ACCESS_CONTROL_REQUEST_HEADERS,
                    ])
                    .supports_credentials()
                    .max_age(3600)
            }
            None => {
                // Default restrictive CORS: No origin allowed explicitly.
                // This will likely block browser requests unless the browser and server are on the same origin.
                log::warn!("CORS is configured restrictively: No ALLOWED_ORIGIN set.");
                Cors::default() // No allowed_origin set
                    .allowed_methods(vec!["GET", "POST", "PUT", "DELETE", "OPTIONS"])
                     .allowed_headers(vec![
                        header::AUTHORIZATION,
                        header::ACCEPT,
                        header::CONTENT_TYPE,
                        header::ORIGIN,
                        header::ACCESS_CONTROL_REQUEST_METHOD,
                        header::ACCESS_CONTROL_REQUEST_HEADERS,
                    ])
                    .supports_credentials()
                    .max_age(3600)
                // DO NOT use allow_any_origin() unless you fully understand the security implications.
            }
        };

        App::new()
            .wrap(cors) // Apply CORS middleware
            .wrap(Logger::default()) // Add request logging (default format)
            .app_data(db_data_clone) // Share database connection pool
            // --- API Routes ---
            .service(
                web::scope("/api") // Group API routes under /api
                    // --- Public Routes ---
                    .route("/login", web::post().to(handlers::login))
                    .route(
                        "/forms/{form_id}/submissions",
                        web::post().to(handlers::submit_form),
                    )
                    // --- Protected Routes (using Auth extractor) ---
                    .route("/logout", web::post().to(handlers::logout)) // Added logout
                    .route("/forms", web::post().to(handlers::create_form))
                    .route("/forms", web::get().to(handlers::get_forms))
                    .route(
                        "/forms/{form_id}/submissions",
                        web::get().to(handlers::get_submissions),
                    ),
            )
            // --- Static Files (Serve Frontend - Optional) ---
            // Assumes frontend build output is in ../frontend/dist
            // Register this LAST to avoid conflicts with API routes
            .service(
                fs::Files::new("/", "../frontend/dist/")
                    .index_file("index.html")
                    .use_last_modified(true)
                    // Optional: Add a fallback to index.html for SPA routing
                    .default_handler(
                        fs::NamedFile::open("../frontend/dist/index.html").unwrap_or_else(|_| {
                            log::error!("Fallback file not found: ../frontend/dist/index.html");
                            process::exit(1); // Exit if fallback file is missing
                        }), // Handle error explicitly
                    ),
            )
    })
    .bind(&bind_address)?
    .run()
    .await
}
</file>

<file path="src/models.rs">
// src/models.rs
use serde::{Deserialize, Serialize};
// Consider adding chrono for DateTime types if needed in responses
// use chrono::{DateTime, Utc};

// Represents the structure for defining a form
#[derive(Serialize, Deserialize, Debug, Clone)]
pub struct Form {
    #[serde(skip_serializing_if = "Option::is_none")]
    pub id: Option<String>,
    pub name: String,
    /// Stores the structure defining the form fields.
    /// Expected to be a JSON array of field definition objects.
    /// Example field definition object:
    /// ```json
    /// {
    ///   "name": "email",                  // String, required: Unique identifier for the field
    ///   "type": "email",                  // String, required: "string", "number", "boolean", "email", "url", "object", "array"
    ///   "label": "Email Address",         // String, optional: User-friendly label
    ///   "required": true,                 // Boolean, optional (default: false): If the field must have a value
    ///   "placeholder": "you@example.com", // String, optional: Placeholder text
    ///   "minLength": 5,                   // Number, optional: Minimum length for strings
    ///   "maxLength": 100,                 // Number, optional: Maximum length for strings
    ///   "min": 0,                         // Number, optional: Minimum value for numbers
    ///   "max": 100,                       // Number, optional: Maximum value for numbers
    ///   "pattern": "^\\S+@\\S+\\.\\S+$"     // String, optional: Regex pattern for strings (e.g., email, url types might use this implicitly or explicitly)
    ///   // Add other properties like "options" for select/radio, etc.
    /// }
    /// ```
    pub fields: serde_json::Value,
    // Optional: Add created_at if needed in API responses
    // pub created_at: Option<DateTime<Utc>>,
}

// Represents a single submission for a specific form
#[derive(Serialize, Deserialize, Debug, Clone)]
pub struct Submission {
    pub id: String,
    pub form_id: String,
    /// Stores the data submitted by the user.
    /// Expected to be a JSON object where keys are field names (`name`) from the form definition's `fields` array.
    /// Example: `{ "email": "user@example.com", "age": 30 }`
    pub data: serde_json::Value,
    // Optional: Add created_at if needed in API responses
    // pub created_at: Option<DateTime<Utc>>,
}

// Used for the /login endpoint request body
#[derive(Debug, Serialize, Deserialize)]
pub struct LoginCredentials {
    pub username: String,
    pub password: String,
}

// Used for the /login endpoint response body
#[derive(Debug, Serialize, Deserialize)]
pub struct LoginResponse {
    pub token: String, // The session token (UUID)
}

// Used internally to represent a user fetched from the DB for authentication check
// Not serialized, only used within db.rs and handlers.rs
#[derive(Debug)]
pub struct UserAuthData {
    pub id: String,
    pub hashed_password: String,
    // Note: Token and expiry are handled separately and not needed in this specific struct
}

// --- Custom Application Error (Optional but Recommended for Consistency) ---
// Although not fully integrated in this pass to minimize changes,
// this shows the structure for future improvement.

// use actix_web::{ResponseError, http::StatusCode};
// use std::fmt;

// #[derive(Debug)]
// pub enum AppError {
//     DatabaseError(anyhow::Error),
//     ConfigError(String),
//     ValidationError(serde_json::Value), // Store the validation errors JSON
//     NotFound(String),
//     Unauthorized(String),
//     InternalError(String),
//     BlockingError(String),
// }

// impl fmt::Display for AppError {
//     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
//         match self {
//             AppError::DatabaseError(e) => write!(f, "Database error: {}", e),
//             AppError::ConfigError(s) => write!(f, "Configuration error: {}", s),
//             AppError::ValidationError(_) => write!(f, "Validation failed"),
//             AppError::NotFound(s) => write!(f, "Not found: {}", s),
//             AppError::Unauthorized(s) => write!(f, "Unauthorized: {}", s),
//             AppError::InternalError(s) => write!(f, "Internal server error: {}", s),
//             AppError::BlockingError(s) => write!(f, "Blocking operation error: {}", s),
//         }
//     }
// }

// impl ResponseError for AppError {
//     fn status_code(&self) -> StatusCode {
//         match self {
//             AppError::DatabaseError(_) => StatusCode::INTERNAL_SERVER_ERROR,
//             AppError::ConfigError(_) => StatusCode::INTERNAL_SERVER_ERROR,
//             AppError::ValidationError(_) => StatusCode::BAD_REQUEST,
//             AppError::NotFound(_) => StatusCode::NOT_FOUND,
//             AppError::Unauthorized(_) => StatusCode::UNAUTHORIZED,
//             AppError::InternalError(_) => StatusCode::INTERNAL_SERVER_ERROR,
//             AppError::BlockingError(_) => StatusCode::INTERNAL_SERVER_ERROR,
//         }
//     }

//     fn error_response(&self) -> HttpResponse {
//         let status = self.status_code();
//         let error_json = match self {
//             AppError::ValidationError(errors) => errors.clone(),
//              // Provide a generic error structure for others
//             _ => json!({ "error": status.canonical_reason().unwrap_or("Unknown Error"), "message": self.to_string() }),
//         };

//         HttpResponse::build(status).json(error_json)
//     }
// }

// // Implement From traits to convert other errors into AppError easily
// impl From<anyhow::Error> for AppError {
//     fn from(err: anyhow::Error) -> Self {
//         // Basic conversion, could add more context analysis here
//         AppError::DatabaseError(err)
//     }
// }
// impl From<actix_web::error::BlockingError> for AppError {
//    fn from(err: actix_web::error::BlockingError) -> Self {
//        AppError::BlockingError(err.to_string())
//    }
//}
// // Add From<rusqlite::Error>, From<serde_json::Error>, etc. as needed
</file>

</files>