<?php
/**
 * Settings class for Aha Prev Next.
 *
 * @package AHA_Prev_Next
 * @since 0.1.0
 */

if ( ! defined( 'WPINC' ) ) {
	die;
}

class AHA_Prev_Next_Settings {

	/** @var AHA_Prev_Next_Settings */
	private static $instance = null;

	/** @var string */
	private $option_name = 'aha_prev_next_settings';

	/** @var AHA_Prev_Next_Settings_Fields */
	private $fields;

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

	public function __construct() {
		$this->fields = new AHA_Prev_Next_Settings_Fields( $this->option_name, array( $this, 'get_settings' ) );
		add_action( 'admin_menu', array( $this, 'register_menu' ) );
		add_action( 'admin_init', array( $this, 'register_settings' ) );
		add_action( 'admin_init', array( $this, 'maybe_save_uninstall_preference' ) );
		add_filter( 'aha_prev_next_settings_tabs', array( $this, 'append_uninstall_tab' ), 100 );
	}

	/**
	 * Append Uninstall tab after other add-ons register their tabs.
	 *
	 * @param array $tabs Tab slug => label.
	 * @return array
	 */
	public function append_uninstall_tab( $tabs ) {
		if ( ! is_array( $tabs ) ) {
			$tabs = array();
		}
		$tabs['uninstall'] = __( 'Uninstall', 'aha-prev-next' );
		return $tabs;
	}

	/**
	 * Save “remove data on uninstall” preference (Uninstall tab).
	 *
	 * @return void
	 */
	public function maybe_save_uninstall_preference() {
		if ( ! isset( $_POST['aha_pn_uninstall_prefs'] ) ) {
			return;
		}
		if ( ! current_user_can( 'manage_options' ) ) {
			wp_die( esc_html__( 'Permission denied.', 'aha-prev-next' ) );
		}
		check_admin_referer( 'aha_pn_uninstall_prefs', 'aha_pn_uninstall_prefs_nonce' );

		$erase = isset( $_POST['aha_pn_remove_data_on_uninstall'] ) ? '1' : '0';
		update_option( AHA_PREV_NEXT_UNINSTALL_DELETE_DATA_OPTION, $erase, false );

		wp_safe_redirect(
			add_query_arg(
				array(
					'page'                   => 'aha-prev-next',
					'tab'                    => 'uninstall',
					'aha_pn_uninstall_saved' => '1',
				),
				admin_url( 'admin.php' )
			)
		);
		exit;
	}

	/**
	 * Register admin menu.
	 *
	 * @return void
	 */
	public function register_menu() {
		add_menu_page(
			__( 'Aha Prev Next', 'aha-prev-next' ),
			__( 'Aha Prev Next', 'aha-prev-next' ),
			'manage_options',
			'aha-prev-next',
			array( $this, 'render_settings_page' ),
			'dashicons-image-flip-horizontal',
			76
		);
	}

	/**
	 * Register settings, sections and fields.
	 *
	 * @return void
	 */
	public function register_settings() {
		register_setting(
			'aha_prev_next_group',
			$this->option_name,
			array(
				'sanitize_callback' => array( $this, 'sanitize_settings' ),
			)
		);

		// General tab.
		add_settings_section(
			'aha_prev_next_general',
			__( 'General', 'aha-prev-next' ),
			array( $this->fields, 'render_section_general' ),
			'aha-prev-next-general'
		);

		add_settings_field(
			'aha_prev_next_enable',
			__( 'Enable', 'aha-prev-next' ),
			array( $this->fields, 'render_field_enable' ),
			'aha-prev-next-general',
			'aha_prev_next_general'
		);

		// Display tab.
		add_settings_section(
			'aha_prev_next_display',
			__( 'Display', 'aha-prev-next' ),
			array( $this->fields, 'render_section_display' ),
			'aha-prev-next-display'
		);

		add_settings_field(
			'aha_prev_next_post_types',
			__( 'Enabled post types', 'aha-prev-next' ),
			array( $this->fields, 'render_field_post_types' ),
			'aha-prev-next-display',
			'aha_prev_next_display'
		);

		add_settings_field(
			'aha_prev_next_position',
			__( 'Position', 'aha-prev-next' ),
			array( $this->fields, 'render_field_position' ),
			'aha-prev-next-display',
			'aha_prev_next_display'
		);

		add_settings_field(
			'aha_prev_next_woo_position',
			__( 'WooCommerce product position', 'aha-prev-next' ),
			array( $this->fields, 'render_field_woo_position' ),
			'aha-prev-next-display',
			'aha_prev_next_display'
		);

		// Style tab.
		add_settings_section(
			'aha_prev_next_style',
			__( 'Style', 'aha-prev-next' ),
			array( $this->fields, 'render_section_style' ),
			'aha-prev-next-style'
		);

		add_settings_field(
			'aha_prev_next_show_thumbnail',
			__( 'Thumbnail', 'aha-prev-next' ),
			array( $this->fields, 'render_field_show_thumbnail' ),
			'aha-prev-next-style',
			'aha_prev_next_style'
		);

		add_settings_field(
			'aha_prev_next_title_length',
			__( 'Title length', 'aha-prev-next' ),
			array( $this->fields, 'render_field_title_length' ),
			'aha-prev-next-style',
			'aha_prev_next_style'
		);

		add_settings_field(
			'aha_prev_next_colors',
			__( 'Colors', 'aha-prev-next' ),
			array( $this->fields, 'render_field_colors' ),
			'aha-prev-next-style',
			'aha_prev_next_style'
		);
	}

	/**
	 * Sanitize settings input.
	 *
	 * @param mixed $input Raw input.
	 * @return array
	 */
	public function sanitize_settings( $input ) {
		if ( ! is_array( $input ) ) {
			return array();
		}

		$existing  = get_option( $this->option_name, array() );
		$existing  = is_array( $existing ) ? $existing : array();

		// Start from existing values so saving one tab doesn't wipe the others.
		$sanitized = $existing;

		// Checkboxes: only update when the field is present in POST (tab rendered).
		if ( array_key_exists( 'enable', $input ) ) {
			$sanitized['enable'] = ! empty( $input['enable'] ) ? 1 : 0;
		}
		if ( array_key_exists( 'show_thumbnail', $input ) ) {
			$sanitized['show_thumbnail'] = ! empty( $input['show_thumbnail'] ) ? 1 : 0;
		}


		// Enabled post types (only allow those returned by allowed list).
		if ( array_key_exists( 'enabled_post_types', $input ) ) {
			$allowed = function_exists( 'aha_prev_next_get_allowed_post_types' ) ? aha_prev_next_get_allowed_post_types() : array( 'post', 'page' );
			$allowed = array_fill_keys( (array) $allowed, true );

			$sanitized['enabled_post_types'] = array();
			if ( is_array( $input['enabled_post_types'] ) ) {
				foreach ( $input['enabled_post_types'] as $pt ) {
					$pt = sanitize_key( $pt );
					if ( isset( $allowed[ $pt ] ) ) {
						$sanitized['enabled_post_types'][] = $pt;
					}
				}
			}

			// If user unchecked everything, keep it empty? For now fallback to defaults.
			if ( empty( $sanitized['enabled_post_types'] ) ) {
				$sanitized['enabled_post_types'] = array( 'post', 'page' );
			}
		}

		// Layout settings.
		if ( array_key_exists( 'position', $input ) ) {
			$pos = sanitize_key( $input['position'] );
			$sanitized['position'] = in_array( $pos, array( 'above', 'below' ), true ) ? $pos : 'below';
		}
		if ( array_key_exists( 'woo_position', $input ) ) {
			$woo_pos = sanitize_key( $input['woo_position'] );
			$sanitized['woo_position'] = in_array(
				$woo_pos,
				array(
					'above',
					'below',
					'woocommerce_after_single_product',
					'woocommerce_after_single_product_summary',
					'woocommerce_before_single_product',
					'disable',
				),
				true
			) ? $woo_pos : 'woocommerce_after_single_product';
		}

		// Title length.
		if ( array_key_exists( 'title_length', $input ) ) {
			$len = absint( $input['title_length'] );
			if ( 0 === $len ) {
				$sanitized['title_length'] = 0;
			} else {
				$sanitized['title_length'] = max( 10, min( 120, $len ) );
			}
		}


		// Colors.
		if ( array_key_exists( 'card_bg', $input ) ) {
			$sanitized['card_bg'] = sanitize_hex_color( $input['card_bg'] ) ?: '#f3f3f3';
		}
		if ( array_key_exists( 'title_color', $input ) ) {
			$sanitized['title_color'] = sanitize_hex_color( $input['title_color'] ) ?: '#000000';
		}
		if ( array_key_exists( 'arrow_color', $input ) ) {
			$sanitized['arrow_color'] = sanitize_hex_color( $input['arrow_color'] ) ?: '#000000';
		}
		if ( array_key_exists( 'subtitle_color', $input ) ) {
			$sanitized['subtitle_color'] = sanitize_hex_color( $input['subtitle_color'] ) ?: '#6b6b6b';
		}

		return $sanitized;
	}

	/**
	 * Get merged settings with defaults.
	 *
	 * @return array
	 */
	public function get_settings() {
		$defaults = array(
			'enable'             => 1,
			'enabled_post_types' => array( 'post', 'page' ),
			'position'           => 'below',
			'woo_position'       => 'woocommerce_after_single_product',
			'show_thumbnail'     => 1,
			'title_length'       => 40,
			'card_bg'            => '#f3f3f3',
			'title_color'        => '#000000',
			'arrow_color'        => '#000000',
			'subtitle_color'     => '#6b6b6b',
		);

		$settings = get_option( $this->option_name, array() );
		$settings = is_array( $settings ) ? $settings : array();
		return wp_parse_args( $settings, $defaults );
	}

	/**
	 * Render settings page.
	 *
	 * @return void
	 */
	public function render_settings_page() {
		if ( ! current_user_can( 'manage_options' ) ) {
			return;
		}

		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Read-only tab state.
		$active_tab = isset( $_GET['tab'] ) ? sanitize_key( wp_unslash( $_GET['tab'] ) ) : 'general';

		$tabs = array(
			'general'   => __( 'General', 'aha-prev-next' ),
			'display'   => __( 'Display', 'aha-prev-next' ),
			'style'     => __( 'Style', 'aha-prev-next' ),
			'shortcode' => __( 'Shortcode', 'aha-prev-next' ),
		);

		/**
		 * Filter settings tabs (allows add-ons to add extra tabs).
		 *
		 * @param array $tabs Associative array of tab_slug => label.
		 */
		$tabs = apply_filters( 'aha_prev_next_settings_tabs', $tabs );

		if ( ! array_key_exists( $active_tab, $tabs ) ) {
			$active_tab = 'general';
		}
		?>
		<div class="wrap">
			<?php include AHA_PREV_NEXT_PATH . 'templates/admin/page-header.php'; ?>

			<?php if ( 'uninstall' === $active_tab ) : ?>
				<?php $this->render_uninstall_tab(); ?>
			<?php elseif ( 'shortcode' === $active_tab ) : ?>
				<?php $this->render_shortcode_tab(); ?>
			<?php else : ?>

			<form action="options.php" method="post">
				<?php settings_fields( 'aha_prev_next_group' ); ?>

				<div class="aha-prev-next-tab-content active" data-tab="<?php echo esc_attr( $active_tab ); ?>">
					<?php $this->render_tab_content( $active_tab ); ?>
				</div>

				<?php submit_button(); ?>
			</form>

			<?php endif; ?>

			<?php include AHA_PREV_NEXT_PATH . 'templates/admin/page-sidebar.php'; ?>
		</div>
		<?php
	}

	/**
	 * Render the content for the active tab.
	 *
	 * @param string $active_tab Current tab slug.
	 * @return void
	 */
	private function render_tab_content( $active_tab ) {
		$core_tabs = array( 'general', 'display', 'style' );

		switch ( $active_tab ) {
			case 'general':
				do_settings_sections( 'aha-prev-next-general' );
				break;
			case 'display':
				do_settings_sections( 'aha-prev-next-display' );
				break;
			case 'style':
				do_settings_sections( 'aha-prev-next-style' );
				break;
			default:
				if ( ! in_array( $active_tab, $core_tabs, true ) ) {
					/**
					 * Action: aha_prev_next_settings_tab_{slug}
					 * Add-ons hook here to render their tab content.
					 */
					do_action( 'aha_prev_next_settings_tab_' . $active_tab );
				}
				break;
		}
	}

	/**
	 * Render Uninstall tab.
	 *
	 * @return void
	 */
	private function render_uninstall_tab() {
		$enabled = '1' === get_option( AHA_PREV_NEXT_UNINSTALL_DELETE_DATA_OPTION, '0' );
		?>
		<div class="aha-prev-next-uninstall-tab">
			<h2 class="title"><?php esc_html_e( 'Uninstall & data cleanup', 'aha-prev-next' ); ?></h2>

			<div class="aha-prev-next-uninstall-danger" role="alert">
				<p><strong><?php esc_html_e( 'Important', 'aha-prev-next' ); ?></strong></p>
				<p><?php esc_html_e( 'WordPress only runs a full cleanup when you delete the plugin from Plugins → Installed Plugins ("Delete", not just "Deactivate"). This screen does not remove anything by itself — it only stores your choice for that moment.', 'aha-prev-next' ); ?></p>
			</div>

			<p class="description" style="max-width:720px;">
				<?php esc_html_e( 'By default, data is kept so you can reinstall later without reconfiguring. Enable the checkbox only if you want a clean database after uninstall.', 'aha-prev-next' ); ?>
			</p>

			<form method="post" action="">
				<?php wp_nonce_field( 'aha_pn_uninstall_prefs', 'aha_pn_uninstall_prefs_nonce' ); ?>
				<input type="hidden" name="aha_pn_uninstall_prefs" value="1">

				<fieldset class="aha-prev-next-uninstall-fieldset">
					<label class="aha-prev-next-uninstall-label">
						<input type="checkbox" name="aha_pn_remove_data_on_uninstall" value="1" <?php checked( $enabled ); ?>>
						<span>
							<strong><?php esc_html_e( 'Remove all plugin data when the plugin is deleted', 'aha-prev-next' ); ?></strong><br>
							<span class="description"><?php esc_html_e( 'Applies only after you confirm deletion on the Plugins screen.', 'aha-prev-next' ); ?></span>
						</span>
					</label>
				</fieldset>

				<p class="title" style="margin-top:1.5em;"><?php esc_html_e( 'What gets removed if this option is on', 'aha-prev-next' ); ?></p>
				<ul class="aha-prev-next-uninstall-list">
					<li><?php esc_html_e( 'All Aha Prev Next settings stored in the database', 'aha-prev-next' ); ?></li>
					<li><?php esc_html_e( 'This uninstall preference itself', 'aha-prev-next' ); ?></li>
				</ul>
				<?php
				/**
				 * After the default uninstall list (other add-ons may print extra notes).
				 *
				 * @since 0.1.0
				 */
				do_action( 'aha_prev_next_uninstall_tab_after_list' );
				?>

				<?php submit_button( __( 'Save preference', 'aha-prev-next' ) ); ?>
			</form>
		</div>
		<?php
	}

	/**
	 * Render Shortcode documentation tab.
	 *
	 * @return void
	 */
	private function render_shortcode_tab() {
		$aha_pn_shortcode_attrs = array(
			'position',
			'show_thumbnail',
			'title_length',
		);

		$aha_pn_settings_url_general = add_query_arg( array( 'page' => 'aha-prev-next', 'tab' => 'general' ), admin_url( 'admin.php' ) );
		$aha_pn_settings_url_style   = add_query_arg( array( 'page' => 'aha-prev-next', 'tab' => 'style' ), admin_url( 'admin.php' ) );

		include AHA_PREV_NEXT_PATH . 'templates/admin/shortcode-tab.php';
	}
}