<?php
/**
 * REST API fallback for plugin dependency management
 *
 * @package TableKit
 */

namespace TableBuilder\Core;

defined( 'ABSPATH' ) || exit;

/**
 * REST API fallback when tablekit-essential is not active.
 * Mimics tablekit-essential behavior for compatibility.
 *
 * @since 1.0.0
 */
class RestApi {
	use \TableBuilder\Traits\Singleton;

	/**
	 * Hooks route registration and plugin-cache invalidation into WordPress.
	 */
	public function __construct() {
		add_action( 'rest_api_init', array( $this, 'register_routes' ) );
		add_action( 'activated_plugin', array( $this, 'clear_plugin_cache' ) );
		add_action( 'deactivated_plugin', array( $this, 'clear_plugin_cache' ) );
	}

	/**
	 * Clears the cached plugin-status transient when plugins are (de)activated.
	 *
	 * @return void
	 */
	public function clear_plugin_cache() {
		delete_transient( 'tablekit_plugin_data' );
	}

	/**
	 * Registers the tablekit/v1 fallback REST routes, only if the
	 * tablekit-essential plugin (which normally provides them) isn't active.
	 *
	 * @return void
	 */
	public function register_routes() {
		if ( $this->is_tablekit_essential_active() ) {
			return;
		}

		register_rest_route(
			'tablekit/v1',
			'/table-manager-api/check-plugins',
			array(
				'methods'             => 'POST',
				'callback'            => array( $this, 'check_plugins_status' ),
				'permission_callback' => function () {
					return current_user_can( 'edit_posts' ); },
			)
		);

		register_rest_route(
			'tablekit/v1',
			'/table-manager-api/activate-plugins',
			array(
				'methods'             => 'POST',
				'callback'            => array( $this, 'activate_plugins' ),
				'permission_callback' => function () {
					return current_user_can( 'activate_plugins' ); },
			)
		);

		register_rest_route(
			'tablekit/v1',
			'/table-manager-api/install-plugins',
			array(
				'methods'             => 'POST',
				'callback'            => array( $this, 'install_plugins' ),
				'permission_callback' => function () {
					return current_user_can( 'install_plugins' ); },
			)
		);

		register_rest_route(
			'tablekit/v1',
			'/table-manager-api/check-pro-license',
			array(
				'methods'             => 'POST',
				'callback'            => array( $this, 'check_pro_license' ),
				'permission_callback' => function () {
					return current_user_can( 'activate_plugins' ); },
			)
		);
	}

	/**
	 * Checks whether the tablekit-essential plugin is active.
	 *
	 * @return bool True if tablekit-essential is active.
	 */
	private function is_tablekit_essential_active() {
		if ( ! function_exists( 'is_plugin_active' ) ) {
			require_once ABSPATH . 'wp-admin/includes/plugin.php';
		}
		return is_plugin_active( 'tablekit-essential/tablekit-essential.php' );
	}

	/**
	 * REST callback: report install/active status for a list of plugin slugs.
	 *
	 * @param \WP_REST_Request $request Request with a JSON "plugins" array param.
	 * @return \WP_REST_Response Status per slug: installed/active/state/plugin_file.
	 */
	public function check_plugins_status( $request ) {
		$plugins = $request->get_json_params()['plugins'] ?? array();
		if ( empty( $plugins ) ) {
			return new \WP_REST_Response(
				array(
					'status'  => 'error',
					'message' => 'No plugins specified.',
				),
				400
			);
		}

		// Clear plugin cache to ensure fresh data (critical for detecting deactivated plugins on servers).
		wp_cache_delete( 'plugins', 'plugins' );

		if ( ! function_exists( 'get_plugins' ) || ! function_exists( 'is_plugin_active' ) ) {
			require_once ABSPATH . 'wp-admin/includes/plugin.php';
		}

		$all_plugins = get_plugins();
		$status      = array();

		foreach ( $plugins as $slug ) {
			$slug = sanitize_text_field( $slug );
			if ( empty( $slug ) ) {
				continue;
			}

			$plugin_file = null;
			foreach ( $all_plugins as $plugin_path => $plugin_data ) {
				if ( 0 === strpos( $plugin_path, $slug . '/' ) || $slug . '.php' === $plugin_path ) {
					$plugin_file = $plugin_path;
					break;
				}
			}

			$is_installed = null !== $plugin_file;
			$is_active    = $is_installed && is_plugin_active( $plugin_file );

			$status[ $slug ] = array(
				'installed'   => $is_installed,
				'active'      => $is_active,
				'state'       => $is_installed ? ( $is_active ? 'installed_active' : 'installed_inactive' ) : 'not_installed',
				'plugin_file' => $plugin_file,
			);
		}

		return new \WP_REST_Response(
			array(
				'status'  => 'success',
				'plugins' => $status,
			),
			200
		);
	}

	/**
	 * REST callback: activate a list of already-installed plugins by slug.
	 *
	 * @param \WP_REST_Request $request Request with a JSON "plugins" array param.
	 * @return \WP_REST_Response Activation results: which slugs succeeded/failed.
	 */
	public function activate_plugins( $request ) {
		$plugins = $request->get_json_params()['plugins'] ?? array();
		if ( empty( $plugins ) ) {
			return new \WP_REST_Response(
				array(
					'status'  => 'error',
					'message' => 'No plugins specified.',
				),
				400
			);
		}

		if ( ! function_exists( 'activate_plugin' ) ) {
			require_once ABSPATH . 'wp-admin/includes/plugin.php';
		}

		wp_cache_delete( 'plugins', 'plugins' );

		// Set transient to prevent redirect during programmatic activation.
		set_transient( 'tablekit_skip_activation_redirect', true, 60 );

		$all_plugins = get_plugins();
		$activated   = array();
		$failed      = array();

		foreach ( $plugins as $slug ) {
			$slug = sanitize_text_field( $slug );
			if ( empty( $slug ) ) {
				continue;
			}

			$plugin_file = null;
			foreach ( $all_plugins as $plugin_path => $plugin_data ) {
				if ( strpos( $plugin_path, $slug . '/' ) === 0 || $plugin_path === $slug . '.php' ) {
					$plugin_file = $plugin_path;
					break;
				}
			}

			if ( ! $plugin_file ) {
				$failed[] = array(
					'slug'  => $slug,
					'error' => 'Plugin not found',
				);
				continue;
			}

			if ( is_plugin_active( $plugin_file ) ) {
				$activated[] = $slug;
				continue;
			}

			$result = activate_plugin( $plugin_file, '', false, true ); // Silent activation.
			if ( is_wp_error( $result ) ) {
				$failed[] = array(
					'slug'  => $slug,
					'error' => $result->get_error_message(),
				);
			} else {
				$activated[] = $slug;
			}
		}

		// Clean up transient.
		delete_transient( 'tablekit_skip_activation_redirect' );

		// Clear plugin cache after activation.
		$this->clear_plugin_cache();

		return new \WP_REST_Response(
			array(
				'status'    => empty( $failed ) ? 'success' : 'partial',
				'activated' => $activated,
				'failed'    => $failed,
			),
			200
		);
	}

	/**
	 * REST callback: install (and activate) a list of plugins by slug from
	 * the WordPress.org plugin directory. Slugs containing "-pro" are
	 * rejected, since pro plugins must be purchased/uploaded manually.
	 *
	 * @param \WP_REST_Request $request Request with a JSON "plugins" array param.
	 * @return \WP_REST_Response Installation results: which slugs failed and why.
	 */
	public function install_plugins( $request ) {
		$plugins = $request->get_json_params()['plugins'] ?? array();
		if ( empty( $plugins ) ) {
			return new \WP_REST_Response(
				array(
					'status'  => 'error',
					'message' => 'No plugins specified.',
				),
				400
			);
		}

		if ( ! function_exists( 'plugins_api' ) ) {
			require_once ABSPATH . 'wp-admin/includes/plugin-install.php';
			require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
			require_once ABSPATH . 'wp-admin/includes/file.php';
		}

		$failed = array();

		foreach ( $plugins as $slug ) {
			$slug = sanitize_text_field( $slug );
			if ( empty( $slug ) ) {
				continue;
			}

			// Check if pro plugin.
			if ( strpos( $slug, '-pro' ) !== false ) {
				$failed[] = array(
					'slug'  => $slug,
					'error' => 'Pro plugins must be purchased manually',
				);
				continue;
			}

			// Check if already installed.
			$all_plugins = get_plugins();
			$plugin_file = null;
			foreach ( $all_plugins as $plugin_path => $plugin_data ) {
				if ( strpos( $plugin_path, $slug . '/' ) === 0 ) {
					$plugin_file = $plugin_path;
					break;
				}
			}

			if ( $plugin_file ) {
				// Already installed, just activate.
				if ( ! is_plugin_active( $plugin_file ) ) {
					set_transient( 'tablekit_skip_activation_redirect', true, 60 ); // Set transient to prevent redirect.
					activate_plugin( $plugin_file, '', false, true ); // Silent activation.
					delete_transient( 'tablekit_skip_activation_redirect' );
				}
				continue;
			}

			// Install plugin.
			$api = plugins_api(
				'plugin_information',
				array(
					'slug'   => $slug,
					'fields' => array( 'sections' => false ),
				)
			);

			if ( is_wp_error( $api ) ) {
				$failed[] = array(
					'slug'  => $slug,
					'error' => $api->get_error_message(),
				);
				continue;
			}

			$upgrader = new \Plugin_Upgrader( new \WP_Ajax_Upgrader_Skin() );
			$result   = $upgrader->install( $api->download_link );

			if ( is_wp_error( $result ) ) {
				$failed[] = array(
					'slug'  => $slug,
					'error' => $result->get_error_message(),
				);
			} elseif ( false === $result ) {
				$failed[] = array(
					'slug'  => $slug,
					'error' => 'Installation failed',
				);
			}
		}

		// Clear plugin cache after installation.
		$this->clear_plugin_cache();

		return new \WP_REST_Response(
			array(
				'status' => empty( $failed ) ? 'success' : 'partial',
				'failed' => $failed,
			),
			200
		);
	}

	/**
	 * REST callback: check whether GutenKit Pro's license is active
	 * (license checks are currently only supported for that plugin).
	 *
	 * @param \WP_REST_Request $request Request with a JSON "plugins" array param.
	 * @return \WP_REST_Response License status.
	 */
	public function check_pro_license( $request ) {
		$plugins = $request->get_json_params()['plugins'] ?? array();
		if ( empty( $plugins ) ) {
			return new \WP_REST_Response(
				array(
					'status'  => 'error',
					'message' => 'No plugins specified.',
				),
				400
			);
		}

		// Check if this is gutenkit-blocks-addon-pro.
		$is_gutenkit_pro = false;
		foreach ( $plugins as $slug ) {
			if ( strpos( $slug, 'gutenkit-blocks-addon-pro' ) !== false ) {
				$is_gutenkit_pro = true;
				break;
			}
		}

		if ( ! $is_gutenkit_pro ) {
			return new \WP_REST_Response(
				array(
					'status'        => 'error',
					'license_valid' => false,
					'message'       => 'License check is only available for GutenKit Pro.',
				),
				400
			);
		}

		// Check GutenKit license status.
		// GutenKit uses these options to store license info.
		$oppai = get_option( '__gutenkit_oppai__', '' );
		$key   = get_option( '__gutenkit_license_key__', '' );

		$license_valid = ! empty( $oppai ) && ! empty( $key );

		if ( ! $license_valid ) {
			return new \WP_REST_Response(
				array(
					'status'        => 'error',
					'license_valid' => false,
					'message'       => 'Pro plugin license is not active. Please activate your license at GutenKit → Settings → License to use pro features.',
				),
				200
			);
		}

		return new \WP_REST_Response(
			array(
				'status'        => 'success',
				'license_valid' => true,
				'message'       => 'License is valid.',
			),
			200
		);
	}

	/**
	 * Builds the data localized to the editor as `tablekitEssential`, mirroring
	 * the shape the tablekit-essential plugin provides, so the editor JS
	 * doesn't need to branch on which one is active. Cached for 12 hours.
	 *
	 * @return array{apiUrl:string,restNonce:string,ajaxNonce:string,activePlugins:string[],installedPlugins:string[],requiredPlugins:string[]}
	 */
	public static function get_localized_data() {
		// Check cache first (expires after 12 hours).
		$cached_data = get_transient( 'tablekit_plugin_data' );
		if ( false !== $cached_data && is_array( $cached_data ) ) {
			// Update dynamic nonces.
			$cached_data['restNonce'] = wp_create_nonce( 'wp_rest' );
			$cached_data['ajaxNonce'] = wp_create_nonce( 'tablekit_activate_nonce' );
			return $cached_data;
		}

		if ( ! function_exists( 'get_plugins' ) || ! function_exists( 'is_plugin_active' ) ) {
			require_once ABSPATH . 'wp-admin/includes/plugin.php';
		}

		$all_plugins       = get_plugins();
		$active_plugins    = array();
		$installed_plugins = array();

		foreach ( $all_plugins as $plugin_path => $plugin_data ) {
			$slug                = explode( '/', $plugin_path )[0];
			$installed_plugins[] = $slug;

			if ( is_plugin_active( $plugin_path ) ) {
				$active_plugins[] = $slug;
			}
		}

		$data = array(
			'apiUrl'           => rest_url( 'tablekit/v1/' ),
			'restNonce'        => wp_create_nonce( 'wp_rest' ),
			'ajaxNonce'        => wp_create_nonce( 'tablekit_activate_nonce' ),
			'activePlugins'    => array_unique( $active_plugins ),
			'installedPlugins' => array_unique( $installed_plugins ),
			'requiredPlugins'  => array( 'gutenkit-blocks-addon', 'gutenkit-blocks-addon-pro' ),
		);

		// Cache for 12 hours.
		set_transient( 'tablekit_plugin_data', $data, 12 * HOUR_IN_SECONDS );

		return $data;
	}
}