<?php
/**
 * CODING CONVENTION:
 * This file follows the coding convention where variable_names and function_names
 * use snake_case (underscore_wherever_possible).
 */

namespace App\RSpade\Core;

use App\RSpade\Core\Dispatch\ApiHandler;
use App\RSpade\Core\Manifest\Manifest;

/**
 * API helper class for internal API execution
 * 
 * Provides static methods for executing API endpoints internally
 * without making HTTP requests.
 */
class API
{
    /**
     * Execute an API endpoint internally
     * 
     * @param string $endpoint Format: "ControllerClass.method" or "Namespace\Class.method"
     * @param array $params Parameters to pass to the API method
     * @param array $options Optional settings like authentication context
     * @return mixed Raw PHP response (not JSON)
     * 
     * @example
     * // Simple internal API call
     * $user = API::execute('UserApi.get_profile', ['user_id' => 123]);
     * 
     * // With authentication context
     * $data = API::execute('DataApi.export', [
     *     'format' => 'csv'
     * ], ['auth_token' => 'secret_key']);
     */
    public static function execute($endpoint, array $params = [], array $options = [])
    {
        $api_handler = app(ApiHandler::class);
        
        return $api_handler->execute_internal($endpoint, $params, $options);
    }
    
    /**
     * Execute multiple API endpoints in parallel
     * 
     * @param array $requests Array of [endpoint, params, options] arrays
     * @return array Array of results keyed by endpoint
     * 
     * @example
     * $results = API::execute_batch([
     *     ['UserApi.get_profile', ['user_id' => 123]],
     *     ['PostApi.get_user_posts', ['user_id' => 123]],
     *     ['CommentApi.get_user_comments', ['user_id' => 123]]
     * ]);
     */
    public static function execute_batch(array $requests)
    {
        $api_handler = app(ApiHandler::class);
        $results = [];
        
        foreach ($requests as $request) {
            $endpoint = $request[0];
            $params = $request[1] ?? [];
            $options = $request[2] ?? [];
            
            try {
                $results[$endpoint] = $api_handler->execute_internal($endpoint, $params, $options);
            } catch (\Exception $e) {
                $results[$endpoint] = [
                    'error' => true,
                    'message' => $e->getMessage()
                ];
            }
        }
        
        return $results;
    }
    
    /**
     * Check if an API endpoint exists
     * 
     * @param string $endpoint
     * @return bool
     */
    public static function exists($endpoint)
    {
        try {
            $api_handler = app(ApiHandler::class);
            list($class, $method) = explode('.', $endpoint);
            
            // Try to resolve the class using Manifest
            if (!str_contains($class, '\\')) {
                // Try to find the class by simple name
                try {
                    $metadata = Manifest::php_get_metadata_by_class($class);
                    $class = $metadata['fqcn'];
                } catch (\RuntimeException $e) {
                    // Try with common API namespaces
                    $namespaces = [
                        'App\\Http\\Controllers\\Api\\',
                        'App\\RSpade\\Api\\',
                        'App\\Api\\'
                    ];
                    
                    $found = false;
                    foreach ($namespaces as $namespace) {
                        try {
                            $metadata = Manifest::php_get_metadata_by_fqcn($namespace . $class);
                            $class = $metadata['fqcn'];
                            $found = true;
                            break;
                        } catch (\RuntimeException $e2) {
                            // Try next namespace
                        }
                    }
                    
                    if (!$found) {
                        // Class not found in Manifest
                        shouldnt_happen("API class not found in Manifest: {$class}");
                    }
                }
            } else {
                // Full namespace provided, verify it exists in Manifest
                try {
                    $metadata = Manifest::php_get_metadata_by_fqcn($class);
                    $class = $metadata['fqcn'];
                } catch (\RuntimeException $e) {
                    shouldnt_happen("API class not found in Manifest: {$class}");
                }
            }
            
            return method_exists($class, $method);
            
        } catch (\Exception $e) {
            return false;
        }
    }
    
    /**
     * Get available API endpoints
     * 
     * @return array List of available endpoints
     */
    public static function get_endpoints()
    {
        $manifest = app(Manifest::class);
        $manifest_data = $manifest->get_manifest();
        
        $endpoints = [];
        
        if (isset($manifest_data['routes']['api'])) {
            foreach ($manifest_data['routes']['api'] as $pattern => $methods) {
                foreach ($methods as $method => $handler) {
                    $endpoints[] = [
                        'endpoint' => $handler['class'] . '.' . $handler['method'],
                        'http_method' => $method,
                        'pattern' => $pattern
                    ];
                }
            }
        }
        
        return $endpoints;
    }
}