<?php
/**
 * Admin settings page for AAL Connector For LACRM.
 *
 * @package LACRM_Forms
 */

declare(strict_types=1);

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

/**
 * Class LACRM_Forms_Admin_Settings
 */
final class LACRM_Forms_Admin_Settings {

	/**
	 * @var self|null
	 */
	private static ?self $instance = null;

	/**
	 * Option key.
	 */
	private const OPTION_KEY = 'lacrm_forms_settings';

	/**
	 * @return self
	 */
	public static function instance(): self {
		if ( self::$instance === null ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	private function __construct() {
		add_action( 'admin_menu', array( $this, 'add_menu' ) );
		add_action( 'admin_init', array( $this, 'register_settings' ) );
		add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_assets' ), 10 );
		add_action( 'admin_notices', array( $this, 'settings_saved_notice' ) );
		add_filter( 'plugin_action_links_' . LACRM_FORMS_PLUGIN_BASENAME, array( $this, 'plugin_links' ) );
		add_action( 'wp_ajax_lacrm_verify_api', array( $this, 'ajax_verify_api' ) );
	}

	/**
	 * Log entries per page.
	 */
	private const LOG_PER_PAGE = 20;

	/**
	 * Add settings page under Settings (single page: settings + log with pagination).
	 */
	public function add_menu(): void {
		add_options_page(
			__( 'AAL Connector For LACRM', 'aal-connector-for-lacrm' ),
			__( 'AAL Connector For LACRM', 'aal-connector-for-lacrm' ),
			'manage_options',
			'aal-connector-for-lacrm',
			array( $this, 'render_page' )
		);
	}

	/**
	 * Register settings and sections.
	 */
	public function register_settings(): void {
		$this->maybe_clear_log();
		register_setting(
			'lacrm_forms_settings_group',
			self::OPTION_KEY,
			array(
				'type'              => 'array',
				'sanitize_callback' => array( $this, 'sanitize_settings' ),
			)
		);

		add_settings_section(
			'lacrm_forms_main',
			__( 'API', 'aal-connector-for-lacrm' ),
			array( $this, 'section_main_cb' ),
			'aal-connector-for-lacrm'
		);

		add_settings_field(
			'lacrm_api_key',
			__( 'LACRM API key', 'aal-connector-for-lacrm' ),
			array( $this, 'field_api_key' ),
			'aal-connector-for-lacrm',
			'lacrm_forms_main',
			array( 'label_for' => 'lacrm_api_key' )
		);

		add_settings_field(
			'lacrm_default_owner',
			__( 'Default Assignee (optional)', 'aal-connector-for-lacrm' ),
			array( $this, 'field_default_owner' ),
			'aal-connector-for-lacrm',
			'lacrm_forms_main',
			array( 'label_for' => 'lacrm_default_owner' )
		);

		add_settings_field(
			'lacrm_enable_logging',
			__( 'Enable logging', 'aal-connector-for-lacrm' ),
			array( $this, 'field_enable_logging' ),
			'aal-connector-for-lacrm',
			'lacrm_forms_main',
			array( 'label_for' => 'lacrm_enable_logging' )
		);

		add_settings_section(
			'lacrm_forms_plugins',
			__( 'Installed form plugins', 'aal-connector-for-lacrm' ),
			array( $this, 'section_plugins_cb' ),
			'aal-connector-for-lacrm'
		);

		add_settings_field(
			'lacrm_form_plugins',
			__( 'Forms', 'aal-connector-for-lacrm' ),
			array( $this, 'field_form_plugins' ),
			'aal-connector-for-lacrm',
			'lacrm_forms_plugins'
		);
	}

	/**
	 * Sanitize settings.
	 *
	 * @param array $input Raw input.
	 * @return array
	 */
	public function sanitize_settings( array $input ): array {
		$out = array(
			'api_key'         => isset( $input['api_key'] ) ? sanitize_text_field( $input['api_key'] ) : '',
			'default_owner'   => isset( $input['default_owner'] ) ? sanitize_text_field( $input['default_owner'] ) : '',
			'enable_logging'   => ! empty( $input['enable_logging'] ),
		);
		return $out;
	}

	/**
	 * Get detected form plugins with their admin URLs.
	 *
	 * @return array<int, array{name: string, url: string, slug: string}>
	 */
	public function get_installed_form_plugins(): array {
		$plugins = array();
		if ( class_exists( 'WPCF7' ) ) {
			$plugins[] = array(
				'name' => __( 'Contact Form 7', 'aal-connector-for-lacrm' ),
				'url'  => admin_url( 'admin.php?page=wpcf7' ),
				'slug' => 'cf7',
			);
		}
		if ( class_exists( 'GFForms' ) ) {
			$plugins[] = array(
				'name' => __( 'Gravity Forms', 'aal-connector-for-lacrm' ),
				'url'  => admin_url( 'admin.php?page=gf_edit_forms' ),
				'slug' => 'gf',
			);
		}
		return $plugins;
	}

	public function section_main_cb(): void {
		$programmer_api_url = 'https://account.lessannoyingcrm.com/app/Settings/Api';
		echo wp_kses_post(
			'<p>' . sprintf(
				/* translators: %s: link to LACRM Programmer API (Settings → Programmer API) */
				__( 'Create API key from LACRM %s.', 'aal-connector-for-lacrm' ),
				'<a href="' . esc_url( $programmer_api_url ) . '" target="_blank" rel="noopener noreferrer">' . esc_html__( 'Settings → Programmer API', 'aal-connector-for-lacrm' ) . '</a>'
			) . '</p>'
		);
		echo '<p>' . esc_html__( 'Compatible with Contact Form 7 and Gravity Forms.', 'aal-connector-for-lacrm' ) . '</p>';
	}

	public function section_plugins_cb(): void {
		echo '<p class="description">' . esc_html__( 'We detected the following compatible form plugins with AAL Connector For LACRM.', 'aal-connector-for-lacrm' ) . '</p>';
	}

	public function field_form_plugins(): void {
		$plugins = $this->get_installed_form_plugins();
		if ( empty( $plugins ) ) {
			echo '<p class="lacrm-form-plugins-empty">' . esc_html__( 'No supported form plugins detected. Install Contact Form 7 or Gravity Forms to sync submissions to LACRM.', 'aal-connector-for-lacrm' ) . '</p>';
			return;
		}
		$logos = array(
			'cf7' => 'contact-form-7-logo.png',
			'gf'  => 'gravity-form-logo.png',
		);
		$images_url = plugin_dir_url( LACRM_FORMS_PLUGIN_FILE ) . 'assets/images/';
		echo '<ul class="lacrm-form-plugins-grid">';
		foreach ( $plugins as $plugin ) {
			$logo_file = $logos[ $plugin['slug'] ] ?? null;
			echo '<li>';
			echo '<a href="' . esc_url( $plugin['url'] ) . '" class="lacrm-form-plugin-card">';
			echo '<span class="lacrm-plugin-icon">';
			if ( $logo_file ) {
				echo '<img src="' . esc_url( $images_url . $logo_file ) . '" alt="" class="lacrm-plugin-logo" />';
			} else {
				echo '<span class="dashicons dashicons-forms"></span>';
			}
			echo '</span>';
			echo '<span class="lacrm-plugin-label">' . esc_html( $plugin['name'] ) . '</span>';
			echo '<span class="lacrm-plugin-settings-icon" aria-hidden="true"><span class="dashicons dashicons-admin-generic"></span></span>';
			echo '</a>';
			echo '</li>';
		}
		echo '</ul>';
		echo '<p class="description lacrm-form-plugins-note" style="margin-top: 1em;">' . esc_html__( 'Please enable sync for all the forms that needs to be synced with LACRM from the form\'s settings.', 'aal-connector-for-lacrm' ) . '</p>';
	}

	public function field_api_key(): void {
		$val = lacrm_forms_get_option( 'api_key', '' );
		?>
		<input type="password" id="lacrm_api_key" name="<?php echo esc_attr( self::OPTION_KEY ); ?>[api_key]" value="<?php echo esc_attr( $val ); ?>" class="regular-text" autocomplete="off" />
		<button type="button" id="lacrm_verify_api_btn" class="button"><?php esc_html_e( 'Verify API', 'aal-connector-for-lacrm' ); ?></button>
		<span id="lacrm_verify_status" class="lacrm-verify-status" aria-live="polite"></span>
		<p class="description"><?php esc_html_e( 'Required for syncing form submissions to LACRM.', 'aal-connector-for-lacrm' ); ?></p>
		<?php
	}

	public function field_default_owner(): void {
		$val   = lacrm_forms_get_option( 'default_owner', '' );
		$api_key = lacrm_forms_get_option( 'api_key', '' );
		$users = array( 'success' => false, 'users' => array() );
		if ( $api_key !== '' ) {
			$api   = new LACRM_Forms_API( (string) $api_key );
			$users = $api->get_users();
		}
		?>
		<select id="lacrm_default_owner" name="<?php echo esc_attr( self::OPTION_KEY ); ?>[default_owner]">
			<option value=""><?php esc_html_e( '— None —', 'aal-connector-for-lacrm' ); ?></option>
			<?php
			if ( $users['success'] && ! empty( $users['users'] ) ) {
				foreach ( $users['users'] as $user ) {
					$uid  = $user['UserId'] ?? '';
					$name = trim( ( $user['FirstName'] ?? '' ) . ' ' . ( $user['LastName'] ?? '' ) );
					if ( $name === '' ) {
						$name = $uid;
					}
					?>
					<option value="<?php echo esc_attr( $uid ); ?>" <?php selected( $val, $uid ); ?>><?php echo esc_html( $name ); ?></option>
					<?php
				}
			}
			?>
	</select>
	<p class="description"><?php esc_html_e( 'New contacts will be assigned to this user unless overridden in individual form settings.', 'aal-connector-for-lacrm' ); ?></p>
	<?php if ( $api_key !== '' && $val === '' ) : ?>
	<div class="lacrm-panel-notice lacrm-panel-notice-warning" style="margin-top: 8px; max-width: 480px;">
		<p><?php esc_html_e( 'No default assignee set. LACRM requires an owner for every contact — sync will fail on all forms until an assignee is configured here or overridden per-form.', 'aal-connector-for-lacrm' ); ?></p>
	</div>
	<?php endif; ?>
	<?php
}

	public function field_enable_logging(): void {
		$val = lacrm_forms_get_option( 'enable_logging', true );
		?>
		<div class="lacrm-logging-field">
			<label for="lacrm_enable_logging">
				<input type="checkbox" id="lacrm_enable_logging" name="<?php echo esc_attr( self::OPTION_KEY ); ?>[enable_logging]" value="1" <?php checked( $val ); ?> />
				<?php esc_html_e( 'Log API calls and sync events (stored in WordPress options).', 'aal-connector-for-lacrm' ); ?>
			</label>
		</div>
		<?php
	}

	/**
	 * Handle clear log action (from settings or log page).
	 */
	public function maybe_clear_log(): void {
		if ( ! current_user_can( 'manage_options' ) ) {
			return;
		}
		if ( ! isset( $_GET['lacrm_clear_log'] ) || ! isset( $_GET['_wpnonce'] ) || ! wp_verify_nonce( sanitize_text_field( wp_unslash( $_GET['_wpnonce'] ) ), 'lacrm_clear_log' ) ) {
			return;
		}
		LACRM_Forms_Logger::instance()->clear();
		wp_safe_redirect( remove_query_arg( array( 'lacrm_clear_log', '_wpnonce', 'paged' ), admin_url( 'options-general.php?page=aal-connector-for-lacrm' ) ) );
		exit;
	}

	/**
	 * Verify API key via AJAX. On success, saves the API key globally and returns users for the Default Assignee dropdown.
	 */
	public function ajax_verify_api(): void {
		check_ajax_referer( 'lacrm_verify_api', 'nonce' );
		if ( ! current_user_can( 'manage_options' ) ) {
			wp_send_json_error( array( 'message' => __( 'Permission denied.', 'aal-connector-for-lacrm' ) ) );
		}
		$api_key = isset( $_POST['api_key'] ) ? sanitize_text_field( wp_unslash( $_POST['api_key'] ) ) : '';
		if ( $api_key === '' ) {
			wp_send_json_error( array( 'message' => __( 'Please enter an API key first.', 'aal-connector-for-lacrm' ) ) );
		}
		$api   = new LACRM_Forms_API( $api_key );
		$users = $api->get_users();
		if ( $users['success'] ) {
			// Save API key globally so it persists and Default Assignee dropdown can show users.
			$options = get_option( self::OPTION_KEY, array() );
			$options = is_array( $options ) ? $options : array();
			$options['api_key'] = $api_key;
			update_option( self::OPTION_KEY, $options );
			delete_transient( 'lacrm_cf_contact_defs' );

			$users_list = array();
			if ( ! empty( $users['users'] ) && is_array( $users['users'] ) ) {
				foreach ( $users['users'] as $user ) {
					$uid  = isset( $user['UserId'] ) ? (string) $user['UserId'] : '';
					$name = trim( ( $user['FirstName'] ?? '' ) . ' ' . ( $user['LastName'] ?? '' ) );
					if ( $name === '' && $uid !== '' ) {
						$name = $uid;
					}
					if ( $uid !== '' ) {
						$users_list[] = array( 'value' => $uid, 'label' => $name );
					}
				}
			}
			wp_send_json_success( array(
				'message' => __( 'API key saved. Connection successful.', 'aal-connector-for-lacrm' ),
				'users'   => $users_list,
			) );
		}
		$msg = isset( $users['error_description'] ) ? $users['error_description'] : __( 'Invalid API key or connection failed.', 'aal-connector-for-lacrm' );
		wp_send_json_error( array( 'message' => $msg ) );
	}

	/**
	 * Enqueue admin assets.
	 *
	 * @param string $hook Page hook.
	 */
	public function enqueue_assets( string $hook ): void {
		if ( $hook !== 'settings_page_aal-connector-for-lacrm' ) {
			return;
		}
		wp_enqueue_style(
			'lacrm-connector-admin-settings',
			plugin_dir_url( LACRM_FORMS_PLUGIN_FILE ) . 'assets/css/admin-settings.css',
			array(),
			LACRM_FORMS_VERSION
		);
		wp_enqueue_script(
			'lacrm-connector-settings',
			plugin_dir_url( LACRM_FORMS_PLUGIN_FILE ) . 'assets/js/settings.js',
			array( 'jquery' ),
			LACRM_FORMS_VERSION,
			true
		);
		wp_localize_script(
			'lacrm-connector-settings',
			'lacrmFormsSettings',
			array(
				'ajaxUrl' => admin_url( 'admin-ajax.php' ),
				'nonce'   => wp_create_nonce( 'lacrm_verify_api' ),
				'i18n'    => array(
					'verifying'   => __( 'Verifying…', 'aal-connector-for-lacrm' ),
					'error'      => __( 'Error', 'aal-connector-for-lacrm' ),
					'enter_key'  => __( 'Please enter an API key first.', 'aal-connector-for-lacrm' ),
					'conn_failed' => __( 'Invalid API key or connection failed.', 'aal-connector-for-lacrm' ),
					'req_failed' => __( 'Request failed.', 'aal-connector-for-lacrm' ),
				),
			)
		);
	}

	/**
	 * Render settings page.
	 */
	public function render_page(): void {
		if ( ! current_user_can( 'manage_options' ) ) {
			return;
		}
		$settings_url = admin_url( 'options-general.php?page=aal-connector-for-lacrm' );
		?>
		<div class="wrap lacrm-connector-settings-wrap">
			<header class="lacrm-page-header">
				<h1>
					<img src="<?php echo esc_url( plugin_dir_url( LACRM_FORMS_PLUGIN_FILE ) . 'assets/images/lacrm-connector-logo.png' ); ?>" alt="" class="lacrm-header-logo" />
					<?php esc_html_e( 'AAL Connector For LACRM Settings', 'aal-connector-for-lacrm' ); ?>
				</h1>
				<p class="lacrm-page-desc"><?php esc_html_e( 'Sync your contact forms with LACRM (Less Annoying CRM).', 'aal-connector-for-lacrm' ); ?></p>
			</header>
			<form action="options.php" method="post">
				<?php
				settings_fields( 'lacrm_forms_settings_group' );
				do_settings_sections( 'aal-connector-for-lacrm' );
				submit_button();
				?>
			</form>

			<?php $this->render_log_block( $settings_url ); ?>
		</div>
		<?php
	}

	/**
	 * Render the log block (table and pagination) on the same settings page.
	 *
	 * @param string $base_url Base URL for pagination and clear links (settings page).
	 */
	private function render_log_block( string $base_url ): void {
		$enabled      = lacrm_forms_get_option( 'enable_logging', true );
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Read-only pagination display.
		$current_page = isset( $_GET['paged'] ) ? max( 1, absint( $_GET['paged'] ) ) : 1;
		$per_page     = self::LOG_PER_PAGE;
		$result       = LACRM_Forms_Logger::instance()->get_log_page( $per_page, $current_page );
		$log_entries  = $result['items'];
		$total        = $result['total'];
		$total_pages  = $total > 0 ? (int) ceil( $total / $per_page ) : 1;
		$clear_url    = wp_nonce_url( add_query_arg( 'lacrm_clear_log', '1', $base_url ), 'lacrm_clear_log' );
		?>
		<div class="lacrm-log-block">
			<h2 class="lacrm-log-block-title"><?php esc_html_e( 'Log', 'aal-connector-for-lacrm' ); ?></h2>
			<?php if ( ! $enabled ) : ?>
				<p class="description"><?php esc_html_e( 'Logging is disabled. Enable it above to see log entries here.', 'aal-connector-for-lacrm' ); ?></p>
			<?php else : ?>
				<div class="lacrm-log-actions">
					<a href="<?php echo esc_url( $clear_url ); ?>" class="button"><?php esc_html_e( 'Clear log', 'aal-connector-for-lacrm' ); ?></a>
				</div>

				<?php if ( empty( $log_entries ) ) : ?>
					<p class="description"><?php esc_html_e( 'No log entries yet.', 'aal-connector-for-lacrm' ); ?></p>
				<?php else : ?>
				<table class="widefat striped lacrm-log-table">
					<thead>
						<tr>
							<th style="width:150px"><?php esc_html_e( 'Time', 'aal-connector-for-lacrm' ); ?></th>
							<th style="width:80px"><?php esc_html_e( 'Level', 'aal-connector-for-lacrm' ); ?></th>
							<th><?php esc_html_e( 'Message', 'aal-connector-for-lacrm' ); ?></th>
							<th style="width:220px"><?php esc_html_e( 'Context', 'aal-connector-for-lacrm' ); ?></th>
						</tr>
					</thead>
					<tbody>
						<?php foreach ( $log_entries as $entry ) :
							$level       = (string) ( $entry['level'] ?? 'info' );
							$level_class = array(
								'info'    => 'lacrm-level-info',
								'error'   => 'lacrm-level-error',
								'warning' => 'lacrm-level-warning',
								'debug'   => 'lacrm-level-debug',
							)[ $level ] ?? 'lacrm-level-info';
							$ctx = is_array( $entry['context'] ?? null ) ? $entry['context'] : array();
						?>
							<tr>
								<td><?php echo esc_html( $entry['time'] ?? '' ); ?></td>
								<td><span class="lacrm-log-level-badge <?php echo esc_attr( $level_class ); ?>"><?php echo esc_html( $level ); ?></span></td>
								<td><?php echo esc_html( $entry['message'] ?? '' ); ?></td>
								<td>
									<?php if ( ! empty( $ctx ) ) : ?>
										<div class="lacrm-log-context">
											<?php foreach ( $ctx as $k => $v ) : ?>
												<span class="lacrm-log-context-badge"><?php echo esc_html( $k ); ?>: <?php echo esc_html( (string) $v ); ?></span>
											<?php endforeach; ?>
										</div>
									<?php endif; ?>
								</td>
							</tr>
						<?php endforeach; ?>
					</tbody>
				</table>

					<?php if ( $total_pages > 1 ) : ?>
						<div class="lacrm-log-pagination tablenav bottom">
							<div class="tablenav-pages">
								<span class="displaying-num"><?php
									/* translators: %s: number of items */
									echo esc_html( sprintf( _n( '%s item', '%s items', $total, 'aal-connector-for-lacrm' ), number_format_i18n( $total ) ) );
								?></span>
								<span class="pagination-links">
									<?php
									if ( $current_page > 1 ) {
										$prev_url = $current_page === 2 ? $base_url : add_query_arg( 'paged', $current_page - 1, $base_url );
										echo '<a class="prev-page button" href="' . esc_url( $prev_url ) . '">&laquo;</a> ';
									}
									echo '<span class="paging-input">';
									/* translators: 1: current page, 2: total pages */
									echo esc_html( sprintf( __( 'Page %1$s of %2$s', 'aal-connector-for-lacrm' ), number_format_i18n( $current_page ), number_format_i18n( $total_pages ) ) );
									echo '</span>';
									if ( $current_page < $total_pages ) {
										$next_url = add_query_arg( 'paged', $current_page + 1, $base_url );
										echo ' <a class="next-page button" href="' . esc_url( $next_url ) . '">&raquo;</a>';
									}
									?>
								</span>
							</div>
						</div>
					<?php endif; ?>
				<?php endif; ?>
			<?php endif; ?>
		</div>
		<?php
	}

	/**
	 * Show notice after settings are saved.
	 */
	public function settings_saved_notice(): void {
		$screen = function_exists( 'get_current_screen' ) ? get_current_screen() : null;
		if ( ! $screen || $screen->id !== 'settings_page_aal-connector-for-lacrm' ) {
			return;
		}
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Display-only flag set by options.php after save.
		if ( empty( $_GET['settings-updated'] ) ) {
			return;
		}
		?>
		<div class="notice notice-success is-dismissible lacrm-settings-saved-notice">
			<p><?php esc_html_e( 'Please ensure that sync is enabled for all forms that need to be synced with LACRM in the form settings.', 'aal-connector-for-lacrm' ); ?></p>
		</div>
		<?php
	}

	/**
	 * Add settings link on plugins list.
	 *
	 * @param array $links Links.
	 * @return array
	 */
	public function plugin_links( array $links ): array {
		$links[] = '<a href="' . esc_url( admin_url( 'options-general.php?page=aal-connector-for-lacrm' ) ) . '">' . esc_html__( 'Settings', 'aal-connector-for-lacrm' ) . '</a>';
		return $links;
	}
}