<?php
/**
 * CODING CONVENTION:
 * This file follows the coding convention where variable_names and function_names
 * use snake_case (underscore_wherever_possible).
 *
 * @ROUTE-EXISTS-01-EXCEPTION - This file contains documentation examples with fictional route names
 */

namespace App\RSpade\Core;

use App\Models\FlashAlert;
use RuntimeException;
use App\RSpade\Core\Debug\Rsx_Caller_Exception;
use App\RSpade\Core\Manifest\Manifest;
use App\RSpade\Core\Rsx_Route_Proxy;
use App\RSpade\Core\Session\Session;

/**
 * Core RSX framework utility class
 *
 * Provides static utility methods for the RSX framework including
 * flash messages and other core functionality.
 */
class Rsx
{
    /**
     * Current controller being executed
     * @var string|null
     */
    protected static $current_controller = null;

    /**
     * Current action being executed
     * @var string|null
     */
    protected static $current_action = null;

    /**
     * Set the current controller and action being executed
     *
     * @param string $controller_class The controller class name
     * @param string $action_method The action method name
     */
    public static function _set_current_controller_action($controller_class, $action_method)
    {
        // Extract just the class name without namespace
        $parts = explode('\\', $controller_class);
        $class_name = end($parts);

        static::$current_controller = $class_name;
        static::$current_action = $action_method;
    }

    /**
     * Get the current controller class name
     *
     * @return string|null The current controller class or null if not set
     */
    public static function get_current_controller()
    {
        return static::$current_controller;
    }

    /**
     * Get the current action method name
     *
     * @return string|null The current action method or null if not set
     */
    public static function get_current_action()
    {
        return static::$current_action;
    }

    /**
     * Clear the current controller and action tracking
     */
    public static function _clear_current_controller_action()
    {
        static::$current_controller = null;
        static::$current_action = null;
    }

    /**
     * Add a flash alert message for the current session
     *
     * @param string $message The message to display
     * @param string $class_attribute Optional CSS class attribute (defaults to 'alert alert-danger alert-flash')
     * @return void
     */
    public static function flash_alert($message, $class_attribute = 'alert alert-danger alert-flash')
    {
        $session_id = Session::get_session_id();
        if ($session_id === null) {
            return;
        }

        $flash_alert = new FlashAlert();
        $flash_alert->session_id = $session_id;
        $flash_alert->message = $message;
        $flash_alert->class_attribute = $class_attribute;
        $flash_alert->created_at = now();
        $flash_alert->save();
    }

    /**
     * Render all flash alerts for the current session
     *
     * Returns HTML for all flash messages and deletes them from the database.
     * Messages are rendered as Bootstrap 5 alerts with dismissible buttons.
     *
     * @return string HTML string containing all flash alerts or empty string
     */
    public static function render_flash_alerts()
    {
        $session_id = Session::get_session_id();
        if ($session_id === null) {
            return '';
        }

        // Get all flash alerts for this session
        $alerts = FlashAlert::where('session_id', $session_id)
            ->orderBy('created_at', 'asc')
            ->get();

        if ($alerts->isEmpty()) {
            return '';
        }

        // Delete the alerts now that we're rendering them
        FlashAlert::where('session_id', $session_id)
            ->delete();

        // Build HTML for all alerts
        $html = '';
        foreach ($alerts as $alert) {
            $message = htmlspecialchars($alert->message);
            $class = htmlspecialchars($alert->class_attribute);

            $html .= <<<HTML
<div class="{$class} show" role="alert">
    {$message}
</div>
HTML;
        }

        return $html;
    }

    /**
     * Helper method to add a success flash alert
     *
     * @param string $message
     * @return void
     */
    public static function flash_success($message)
    {
        self::flash_alert($message, 'alert alert-success alert-flash');
    }

    /**
     * Helper method to add an error flash alert
     *
     * @param string $message
     * @return void
     */
    public static function flash_error($message)
    {
        self::flash_alert($message, 'alert alert-danger alert-flash');
    }

    /**
     * Helper method to add a warning flash alert
     *
     * @param string $message
     * @return void
     */
    public static function flash_warning($message)
    {
        self::flash_alert($message, 'alert alert-warning alert-flash');
    }

    /**
     * Helper method to add an info flash alert
     *
     * @param string $message
     * @return void
     */
    public static function flash_info($message)
    {
        self::flash_alert($message, 'alert alert-info alert-flash');
    }

    /**
     * Create a route proxy for type-safe URL generation
     *
     * This method creates a route proxy that can generate URLs for a specific controller action.
     * The proxy ensures all required route parameters are provided and handles extra parameters
     * as query string values.
     *
     * Placeholder Routes:
     * When the action starts with '#' (e.g., '#index', '#show'), it indicates a placeholder/unimplemented
     * route for scaffolding purposes. These skip validation and return href="#" to allow incremental
     * development without requiring all controllers to exist.
     *
     * Usage examples:
     * ```php
     * // Simple route without parameters (defaults to 'index' action)
     * $url = Rsx::Route('Frontend_Index_Controller')->url();
     * // Returns: /dashboard
     *
     * // Route with explicit action
     * $url = Rsx::Route('Frontend_Index_Controller')->url();
     * // Returns: /dashboard
     *
     * // Route with required parameter
     * $url = Rsx::Route('Frontend_Client_View_Controller')->url(['id' => 'C001']);
     * // Returns: /clients/view/C001
     *
     * // Route with required and query parameters
     * $url = Rsx::Route('Frontend_Client_View_Controller')->url([
     *     'id' => 'C001',
     *     'tab' => 'history'
     * ]);
     * // Returns: /clients/view/C001?tab=history
     *
     * // Generate absolute URL
     * $absolute = Rsx::Route('Frontend_Index_Controller')->absolute_url();
     * // Returns: https://example.com/dashboard
     *
     * // Check if route is current
     * if (Rsx::Route('Frontend_Index_Controller')->is_current()) {
     *     // This is the currently executing route
     * }
     *
     * // Placeholder route for scaffolding (controller doesn't need to exist)
     * $url = Rsx::Route('Future_Feature_Controller', '#index')->url();
     * // Returns: #
     * ```
     *
     * @param string $class_name The controller class name (e.g., 'User_Controller')
     * @param string $action_name The action/method name (defaults to 'index'). Use '#action' for placeholders.
     * @return Rsx_Route_Proxy Route proxy instance for URL generation
     * @throws RuntimeException If class doesn't exist, isn't a controller, method doesn't exist, or lacks Route attribute
     */
    public static function Route($class_name, $action_name = 'index')
    {
        // Placeholder route: action starts with # means unimplemented/scaffolding
        // Skip all validation and return a placeholder proxy
        if (str_starts_with($action_name, '#')) {
            return new Rsx_Route_Proxy($class_name, $action_name, '#');
        }

        // Try to find the class in the manifest
        try {
            $metadata = Manifest::php_get_metadata_by_class($class_name);
        } catch (RuntimeException $e) {
            // Report error at caller's location (the blade template or PHP code calling Rsx::Route)
            throw new Rsx_Caller_Exception("Class {$class_name} not found in manifest");
        }

        // Verify it extends Rsx_Controller_Abstract
        $extends = $metadata['extends'] ?? '';
        $is_controller = false;

        if ($extends === 'Rsx_Controller_Abstract') {
            $is_controller = true;
        } else {
            // Check if it extends a class that extends Rsx_Controller_Abstract
            $current_class = $extends;
            $max_depth = 10;

            while ($current_class && $max_depth-- > 0) {
                try {
                    $parent_metadata = Manifest::php_get_metadata_by_class($current_class);
                    if (($parent_metadata['extends'] ?? '') === 'Rsx_Controller_Abstract') {
                        $is_controller = true;
                        break;
                    }
                    $current_class = $parent_metadata['extends'] ?? '';
                } catch (RuntimeException $e) {
                    // Check if parent is the abstract controller with FQCN
                    if ($current_class === 'Rsx_Controller_Abstract' ||
                        $current_class === 'App\\RSpade\\Core\\Controller\\Rsx_Controller_Abstract') {
                        $is_controller = true;
                    }
                    break;
                }
            }
        }

        if (!$is_controller) {
            throw new Rsx_Caller_Exception("Class {$class_name} must extend Rsx_Controller_Abstract");
        }

        // Check if method exists and has Route attribute
        if (!isset($metadata['public_static_methods'][$action_name])) {
            throw new Rsx_Caller_Exception("Method {$action_name} not found in class {$class_name}");
        }

        $method_info = $metadata['public_static_methods'][$action_name];

        // All methods in public_static_methods are guaranteed to be static
        // No need to check - but we assert for safety
        if (!isset($method_info['static']) || !$method_info['static']) {
            shouldnt_happen("Method {$class_name}::{$action_name} in public_static_methods is not static - extraction bug");
        }

        // Check for Route or Ajax_Endpoint attribute
        $has_route = false;
        $has_ajax_endpoint = false;
        $route_pattern = null;

        if (isset($method_info['attributes'])) {
            foreach ($method_info['attributes'] as $attr_name => $attr_instances) {
                if ($attr_name === 'Route' || str_ends_with($attr_name, '\\Route')) {
                    $has_route = true;
                    // Get the route pattern from the first instance
                    if (!empty($attr_instances)) {
                        $route_args = $attr_instances[0];
                        $route_pattern = $route_args[0] ?? ($route_args['pattern'] ?? null);
                    }
                    break;
                }
                if ($attr_name === 'Ajax_Endpoint' || str_ends_with($attr_name, '\\Ajax_Endpoint')) {
                    $has_ajax_endpoint = true;
                    break;
                }
            }
        }

        // If has Ajax_Endpoint, return AJAX route URL
        if ($has_ajax_endpoint) {
            $ajax_url = '/_ajax/' . urlencode($class_name) . '/' . urlencode($action_name);
            return new Rsx_Route_Proxy($class_name, $action_name, $ajax_url);
        }

        if (!$has_route) {
            throw new Rsx_Caller_Exception("Method {$class_name}::{$action_name} must have Route or Ajax_Endpoint attribute");
        }

        if (!$route_pattern) {
            throw new Rsx_Caller_Exception("Route attribute on {$class_name}::{$action_name} must have a pattern");
        }

        return new Rsx_Route_Proxy($class_name, $action_name, $route_pattern);
    }
}