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/**
 * Connectors API: WP_Connector_Registry class.
 *
 * @package WordPress
 * @subpackage Connectors
 * @since 7.0.0
 */

/**
 * Manages the registration and lookup of connectors.
 *
 * This is an internal class. Use the public API functions to interact with connectors:
 *
 *  - `wp_is_connector_registered()` — check if a connector exists.
 *  - `wp_get_connector()`           — retrieve a single connector's data.
 *  - `wp_get_connectors()`          — retrieve all registered connectors.
 *
 * Plugins receive the registry instance via the `wp_connectors_init` action
 * to register or override connectors directly.
 *
 * @since 7.0.0
 * @access private
 *
 * @see wp_is_connector_registered()
 * @see wp_get_connector()
 * @see wp_get_connectors()
 * @see _wp_connectors_init()
 *
 * @phpstan-type Connector array{
 *     name: non-empty-string,
 *     description: string,
 *     logo_url?: non-empty-string,
 *     type: non-empty-string,
 *     authentication: array{
 *         method: 'api_key'|'none',
 *         credentials_url?: non-empty-string,
 *         setting_name?: non-empty-string,
 *         constant_name?: non-empty-string,
 *         env_var_name?: non-empty-string
 *     },
 *     plugin: array{
 *         file?: non-empty-string,
 *         is_active: callable(): bool
 *     }
 * }
 */
final class WP_Connector_Registry {
	/**
	 * The singleton instance of the registry.
	 *
	 * @since 7.0.0
	 */
	private static ?WP_Connector_Registry $instance = null;

	/**
	 * Holds the registered connectors.
	 *
	 * Each connector is stored as an associative array with keys:
	 * name, description, type, authentication, and optionally plugin.
	 *
	 * @since 7.0.0
	 * @var array<string, array>
	 * @phpstan-var array<string, Connector>
	 */
	private array $registered_connectors = array();

	/**
	 * Registers a new connector.
	 *
	 * Validates the provided arguments and stores the connector in the registry.
	 * For connectors with `api_key` authentication, a `setting_name` can be provided
	 * explicitly. If omitted, one is automatically generated using the pattern
	 * `connectors_{$type}_{$id}_api_key`, with hyphens in the type and ID normalized
	 * to underscores (e.g., connector type `spam_filtering` with ID `my_plugin` produces
	 * `connectors_spam_filtering_my_plugin_api_key`). This setting name is used for the
	 * Settings API registration and REST API exposure.
	 *
	 * Registering a connector with an ID that is already registered will trigger a
	 * `_doing_it_wrong()` notice and return `null`. To override an existing connector,
	 * call `unregister()` first.
	 *
	 * @since 7.0.0
	 *
	 * @see WP_Connector_Registry::unregister()
	 *
	 * @param string $id   The unique connector identifier. Must match the pattern
	 *                     `/^[a-z0-9_-]+$/` (lowercase alphanumeric, hyphens, and underscores only).
	 * @param array  $args {
	 *     An associative array of arguments for the connector.
	 *
	 *     @type string $name           Required. The connector's display name.
	 *     @type string $description    Optional. The connector's description. Default empty string.
	 *     @type string $logo_url       Optional. URL to the connector's logo image.
	 *     @type string $type           Required. The connector type, e.g. 'ai_provider'.
	 *     @type array  $authentication {
	 *         Required. Authentication configuration.
	 *
	 *         @type string $method          Required. The authentication method: 'api_key' or 'none'.
	 *         @type string $credentials_url Optional. URL where users can obtain API credentials.
	 *         @type string $setting_name    Optional. The setting name for the API key.
	 *                                       When omitted, auto-generated as
	 *                                       `connectors_{$type}_{$id}_api_key`.
	 *                                       Must be a non-empty string when provided.
	 *         @type string $constant_name   Optional. PHP constant name for the API key
	 *                                       (e.g. 'ANTHROPIC_API_KEY'). Only checked when provided.
	 *         @type string $env_var_name    Optional. Environment variable name for the API key
	 *                                       (e.g. 'ANTHROPIC_API_KEY'). Only checked when provided.
	 *     }
	 *     @type array  $plugin         {
	 *         Optional. Plugin data for install/activate UI.
	 *
	 *         @type string   $file      Optional. The plugin's main file path relative to the
	 *                                   plugins directory (e.g. 'my-plugin/my-plugin.php' or
	 *                                   'hello.php').
	 *         @type callable $is_active Optional callback to determine whether the plugin
	 *                                   is active. Receives no arguments and must return bool.
	 *                                   Defaults to `__return_true`.
	 *     }
	 * }
	 * @return array|null The registered connector data on success, null on failure.
	 *
	 * @phpstan-param array{
	 *     name: non-empty-string,
	 *     description?: string,
	 *     logo_url?: non-empty-string,
	 *     type: non-empty-string,
	 *     authentication: array{
	 *         method: 'api_key'|'none',
	 *         credentials_url?: non-empty-string,
	 *         setting_name?: non-empty-string,
	 *         constant_name?: non-empty-string,
	 *         env_var_name?: non-empty-string
	 *     },
	 *     plugin?: array{
	 *         file?: non-empty-string,
	 *         is_active?: callable(): bool
	 *     }
	 * } $args
	 * @phpstan-return Connector|null
	 */
	public function register( string $id, array $args ): ?array {
		if ( ! preg_match( '/^[a-z0-9_-]+$/', $id ) ) {
			_doing_it_wrong(
				__METHOD__,
				__(
					'Connector ID must contain only lowercase alphanumeric characters, hyphens, and underscores.'
				),
				'7.0.0'
			);
			return null;
		}

		if ( $this->is_registered( $id ) ) {
			_doing_it_wrong(
				__METHOD__,
				/* translators: %s: Connector ID. */
				sprintf( __( 'Connector "%s" is already registered.' ), esc_html( $id ) ),
				'7.0.0'
			);
			return null;
		}

		// Validate required fields.
		if ( empty( $args['name'] ) || ! is_string( $args['name'] ) ) {
			_doing_it_wrong(
				__METHOD__,
				/* translators: %s: Connector ID. */
				sprintf( __( 'Connector "%s" requires a non-empty "name" string.' ), esc_html( $id ) ),
				'7.0.0'
			);
			return null;
		}

		if ( empty( $args['type'] ) || ! is_string( $args['type'] ) ) {
			_doing_it_wrong(
				__METHOD__,
				/* translators: %s: Connector ID. */
				sprintf( __( 'Connector "%s" requires a non-empty "type" string.' ), esc_html( $id ) ),
				'7.0.0'
			);
			return null;
		}

		if ( ! isset( $args['authentication'] ) || ! is_array( $args['authentication'] ) ) {
			_doing_it_wrong(
				__METHOD__,
				/* translators: %s: Connector ID. */
				sprintf( __( 'Connector "%s" requires an "authentication" array.' ), esc_html( $id ) ),
				'7.0.0'
			);
			return null;
		}

		if ( empty( $args['authentication']['method'] ) || ! in_array( $args['authentication']['method'], array( 'api_key', 'none' ), true ) ) {
			_doing_it_wrong(
				__METHOD__,
				/* translators: %s: Connector ID. */
				sprintf( __( 'Connector "%s" authentication method must be "api_key" or "none".' ), esc_html( $id ) ),
				'7.0.0'
			);
			return null;
		}

		if ( 'ai_provider' === $args['type'] && ! wp_supports_ai() ) {
			// No need for a `doing_it_wrong` as AI support is disabled intentionally.
			return null;
		}

		$connector = array(
			'name'           => $args['name'],
			'description'    => isset( $args['description'] ) && is_string( $args['description'] ) ? $args['description'] : '',
			'type'           => $args['type'],
			'authentication' => array(
				'method' => $args['authentication']['method'],
			),
		);

		if ( ! empty( $args['logo_url'] ) && is_string( $args['logo_url'] ) ) {
			$connector['logo_url'] = $args['logo_url'];
		}

		if ( 'api_key' === $args['authentication']['method'] ) {
			if ( ! empty( $args['authentication']['credentials_url'] ) && is_string( $args['authentication']['credentials_url'] ) ) {
				$connector['authentication']['credentials_url'] = $args['authentication']['credentials_url'];
			}
			if ( isset( $args['authentication']['setting_name'] ) ) {
				if ( ! is_string( $args['authentication']['setting_name'] ) || '' === $args['authentication']['setting_name'] ) {
					_doing_it_wrong(
						__METHOD__,
						/* translators: %s: Connector ID. */
						sprintf( __( 'Connector "%s" authentication setting_name must be a non-empty string.' ), esc_html( $id ) ),
						'7.0.0'
					);
					return null;
				}
				$connector['authentication']['setting_name'] = $args['authentication']['setting_name'];
			} else {
				$connector['authentication']['setting_name'] = str_replace( '-', '_', "connectors_{$connector['type']}_{$id}_api_key" );
			}
			if ( isset( $args['authentication']['constant_name'] ) ) {
				if ( ! is_string( $args['authentication']['constant_name'] ) || '' === $args['authentication']['constant_name'] ) {
					_doing_it_wrong(
						__METHOD__,
						/* translators: %s: Connector ID. */
						sprintf( __( 'Connector "%s" authentication constant_name must be a non-empty string.' ), esc_html( $id ) ),
						'7.0.0'
					);
					return null;
				}
				$connector['authentication']['constant_name'] = $args['authentication']['constant_name'];
			}
			if ( isset( $args['authentication']['env_var_name'] ) ) {
				if ( ! is_string( $args['authentication']['env_var_name'] ) || '' === $args['authentication']['env_var_name'] ) {
					_doing_it_wrong(
						__METHOD__,
						/* translators: %s: Connector ID. */
						sprintf( __( 'Connector "%s" authentication env_var_name must be a non-empty string.' ), esc_html( $id ) ),
						'7.0.0'
					);
					return null;
				}
				$connector['authentication']['env_var_name'] = $args['authentication']['env_var_name'];
			}
		}

		$connector['plugin'] = array();

		if ( ! empty( $args['plugin'] ) && is_array( $args['plugin'] ) ) {
			if ( ! empty( $args['plugin']['file'] ) ) {
				$connector['plugin']['file'] = $args['plugin']['file'];
			}

			if ( isset( $args['plugin']['is_active'] ) ) {
				if ( ! is_callable( $args['plugin']['is_active'] ) ) {
					_doing_it_wrong(
						__METHOD__,
						/* translators: %s: Connector ID. */
						sprintf( __( 'Connector "%s" plugin is_active must be callable.' ), esc_html( $id ) ),
						'7.0.0'
					);
					return null;
				}

				$connector['plugin']['is_active'] = $args['plugin']['is_active'];
			}
		}

		if ( ! isset( $connector['plugin']['is_active'] ) ) {
			$connector['plugin']['is_active'] = '__return_true';
		}

		$this->registered_connectors[ $id ] = $connector;
		return $connector;
	}

	/**
	 * Unregisters a connector.
	 *
	 * Returns the connector data on success, which can be modified and passed
	 * back to `register()` to override a connector's metadata.
	 *
	 * Triggers a `_doing_it_wrong()` notice if the connector is not registered.
	 * Use `is_registered()` to check first when the connector may not exist.
	 *
	 * @since 7.0.0
	 *
	 * @see WP_Connector_Registry::register()
	 * @see WP_Connector_Registry::is_registered()
	 *
	 * @param string $id The connector identifier.
	 * @return array|null The unregistered connector data on success, null on failure.
	 *
	 * @phpstan-return Connector|null
	 */
	public function unregister( string $id ): ?array {
		if ( ! $this->is_registered( $id ) ) {
			_doing_it_wrong(
				__METHOD__,
				/* translators: %s: Connector ID. */
				sprintf( __( 'Connector "%s" not found.' ), esc_html( $id ) ),
				'7.0.0'
			);
			return null;
		}

		$unregistered = $this->registered_connectors[ $id ];
		unset( $this->registered_connectors[ $id ] );

		return $unregistered;
	}

	/**
	 * Retrieves the list of all registered connectors.
	 *
	 * Do not use this method directly. Instead, use the `wp_get_connectors()` function.
	 *
	 * @since 7.0.0
	 *
	 * @see wp_get_connectors()
	 *
	 * @return array Connector settings keyed by connector ID.
	 *
	 * @phpstan-return array<string, Connector>
	 */
	public function get_all_registered(): array {
		return $this->registered_connectors;
	}

	/**
	 * Checks if a connector is registered.
	 *
	 * Do not use this method directly. Instead, use the `wp_is_connector_registered()` function.
	 *
	 * @since 7.0.0
	 *
	 * @see wp_is_connector_registered()
	 *
	 * @param string $id The connector identifier.
	 * @return bool True if the connector is registered, false otherwise.
	 */
	public function is_registered( string $id ): bool {
		return isset( $this->registered_connectors[ $id ] );
	}

	/**
	 * Retrieves a registered connector.
	 *
	 * Do not use this method directly. Instead, use the `wp_get_connector()` function.
	 *
	 * Triggers a `_doing_it_wrong()` notice if the connector is not registered.
	 * Use `is_registered()` to check first when the connector may not exist.
	 *
	 * @since 7.0.0
	 *
	 * @see wp_get_connector()
	 *
	 * @param string $id The connector identifier.
	 * @return array|null The registered connector data, or null if it is not registered.
	 * @phpstan-return Connector|null
	 */
	public function get_registered( string $id ): ?array {
		if ( ! $this->is_registered( $id ) ) {
			_doing_it_wrong(
				__METHOD__,
				/* translators: %s: Connector ID. */
				sprintf( __( 'Connector "%s" not found.' ), esc_html( $id ) ),
				'7.0.0'
			);
			return null;
		}
		return $this->registered_connectors[ $id ];
	}

	/**
	 * Retrieves the main instance of the registry class.
	 *
	 * @since 7.0.0
	 *
	 * @return WP_Connector_Registry|null The main registry instance, or null if not yet initialized.
	 */
	public static function get_instance(): ?self {
		return self::$instance;
	}

	/**
	 * Sets the main instance of the registry class.
	 *
	 * Called by `_wp_connectors_init()` during the `init` action. Must not be
	 * called outside of that context.
	 *
	 * @since 7.0.0
	 * @access private
	 *
	 * @see _wp_connectors_init()
	 *
	 * @param WP_Connector_Registry $registry The registry instance.
	 */
	public static function set_instance( WP_Connector_Registry $registry ): void {
		if ( ! doing_action( 'init' ) ) {
			_doing_it_wrong(
				__METHOD__,
				__( 'The connector registry instance must be set during the <code>init</code> action.' ),
				'7.0.0'
			);
			return;
		}

		self::$instance = $registry;
	}
}