<?php
/**
 * AI Provider Manager
 *
 * Routes AI requests to appropriate provider based on task type and configuration
 *
 * @package WP_Agentic_Writer
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

class WP_Agentic_Writer_Provider_Manager {
	/**
	 * Get provider instance for specific task type
	 *
	 * @param string $type Task type (chat, clarity, planning, writing, refinement, image).
	 * @return WP_Agentic_Writer_AI_Provider_Interface Provider instance.
	 */
	public static function get_provider_for_task( $type ) {
		$settings = get_option( 'wp_agentic_writer_settings', array() );
		$task_providers = $settings['task_providers'] ?? array();
		
		// Determine which provider to use for this task
		$provider_name = $task_providers[ $type ] ?? 'openrouter';
		
		// Get provider instance with fallback logic
		$provider = self::get_provider_instance( $provider_name, $type );
		
		// If provider not configured or unavailable, fallback to OpenRouter
		if ( ! $provider || ! $provider->is_configured() ) {
			error_log( "Provider '{$provider_name}' not available for task '{$type}', using OpenRouter fallback" );
			return WP_Agentic_Writer_OpenRouter_Provider::get_instance();
		}
		
		return $provider;
	}

	/**
	 * Get provider instance by name
	 *
	 * @param string $provider_name Provider identifier.
	 * @param string $task_type     Task type for validation.
	 * @return WP_Agentic_Writer_AI_Provider_Interface|null Provider instance or null.
	 */
	private static function get_provider_instance( $provider_name, $task_type ) {
		switch ( $provider_name ) {
			case 'local_backend':
				if ( ! class_exists( 'WP_Agentic_Writer_Local_Backend_Provider' ) ) {
					require_once plugin_dir_path( __FILE__ ) . 'class-local-backend-provider.php';
				}
				$provider = new WP_Agentic_Writer_Local_Backend_Provider();
				break;

			case 'codex':
				if ( ! class_exists( 'WP_Agentic_Writer_Codex_Provider' ) ) {
					require_once plugin_dir_path( __FILE__ ) . 'class-codex-provider.php';
				}
				$provider = new WP_Agentic_Writer_Codex_Provider();
				break;

			case 'openrouter':
			default:
				$provider = WP_Agentic_Writer_OpenRouter_Provider::get_instance();
				break;
		}

		// Validate provider supports this task type
		if ( $provider && ! $provider->supports_task_type( $task_type ) ) {
			error_log( "Provider '{$provider_name}' does not support task type '{$task_type}'" );
			return null;
		}

		return $provider;
	}

	/**
	 * Get all available providers with their status
	 *
	 * @return array Array of provider info with name, status, supported tasks.
	 */
	public static function get_available_providers() {
		$providers = array();

		// OpenRouter (always available)
		$openrouter = WP_Agentic_Writer_OpenRouter_Provider::get_instance();
		$providers['openrouter'] = array(
			'name' => 'OpenRouter',
			'configured' => $openrouter->is_configured(),
			'supports' => array( 'chat', 'clarity', 'planning', 'writing', 'refinement', 'image' ),
			'icon' => '☁️',
		);

		// Local Backend
		if ( class_exists( 'WP_Agentic_Writer_Local_Backend_Provider' ) ) {
			$local = new WP_Agentic_Writer_Local_Backend_Provider();
			$providers['local_backend'] = array(
				'name' => 'Local Backend',
				'configured' => $local->is_configured(),
				'supports' => array( 'chat', 'clarity', 'planning', 'writing', 'refinement' ),
				'icon' => '🏠',
			);
		}

		// Codex
		if ( class_exists( 'WP_Agentic_Writer_Codex_Provider' ) ) {
			$codex = new WP_Agentic_Writer_Codex_Provider();
			$providers['codex'] = array(
				'name' => 'Codex (OpenAI)',
				'configured' => $codex->is_configured(),
				'supports' => array( 'chat', 'clarity', 'planning', 'writing', 'refinement' ),
				'icon' => '🔗',
			);
		}

		return $providers;
	}

	/**
	 * Test all configured providers
	 *
	 * @return array Results of connection tests.
	 */
	public static function test_all_providers() {
		$results = array();
		$providers = self::get_available_providers();

		foreach ( $providers as $key => $info ) {
			if ( ! $info['configured'] ) {
				$results[ $key ] = array(
					'success' => false,
					'message' => 'Not configured',
				);
				continue;
			}

			$provider = self::get_provider_instance( $key, 'chat' );
			if ( $provider ) {
				$test_result = $provider->test_connection();
				$results[ $key ] = is_wp_error( $test_result )
					? array(
						'success' => false,
						'message' => $test_result->get_error_message(),
					)
					: $test_result;
			}
		}

		return $results;
	}
}