<?php

namespace Yipresser\AdminOptimizer\Admin;

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

use const Yipresser\AdminOptimizer\Admin\MODULES_OPTION;

/**
 * Presets class — one-click module bundles for common site profiles.
 */
class Presets {

	/**
	 * Constructor.
	 */
	public function __construct() {
		add_filter( 'adminoptimizer_settings_navtab', [ $this, 'add_settings_navtab' ] );
		add_action( 'wp_ajax_adminoptim_apply_preset', [ $this, 'handle_apply_preset' ] );
		add_action( 'admin_enqueue_scripts', [ $this, 'localize_preset_script' ] );
	}

	/**
	 * Returns all preset definitions.
	 *
	 * @return array<string, array<string, mixed>>
	 */
	public static function get_presets(): array {
		return [
			'performance' => [
				'label'       => __( 'Performance & Cleanup', 'admin-optimizer' ),
				'description' => __( 'Remove WordPress bloat to speed up your frontend.', 'admin-optimizer' ),
				'modules'     => [
					'disable_emojis'           => 1,
					'disable_jquery_migrate'   => 1,
					'disable_404_redirect'     => 1,
					'remove_oembed'            => 1,
					'enable_heartbeat_control' => 1,
					'enable_db_cleaner'        => 1,
				],
			],
			'security'    => [
				'label'       => __( 'Security Hardening', 'admin-optimizer' ),
				'description' => __( 'Lock down your site against common WordPress attacks.', 'admin-optimizer' ),
				'modules'     => [
					'hide_wp_version'            => 1,
					'disable_xmlrpc'             => 1,
					'enable_custom_login_url'    => 1,
					'enable_block_login'         => 1,
					'enable_2fa'                 => 1,
					'enable_user_access_manager' => 1,
					'remove_rest_api_link'       => 1,
					'remove_rsd'                 => 1,
					'remove_shortlink'           => 1,
					'remove_pingback_header'     => 1,
					'remove_powered_by_header'   => 1,
				],
			],
			'agency'      => [
				'label'       => __( 'Agency / Developer', 'admin-optimizer' ),
				'description' => __( 'Custom content architecture, media tools, and tighter access control.', 'admin-optimizer' ),
				'modules'     => [
					'enable_custom_post_types'   => 1,
					'enable_custom_taxonomies'   => 1,
					'enable_custom_post_status'  => 1,
					'enable_svg_upload'          => 1,
					'enable_page_ordering'       => 1,
					'enable_txt_management'      => 1,
					'enable_custom_login_url'    => 1,
					'enable_xml_sitemap'         => 1,
					'enable_user_access_manager' => 1,
					'enable_redirect_manager'    => 1,
					'enable_custom_code'         => 1,
					'enable_form_builder'        => 1,
				],
			],
			'blogger'     => [
				'label'       => __( 'Content Creator', 'admin-optimizer' ),
				'description' => __( 'Productivity tools for writers and editorial teams managing lots of posts.', 'admin-optimizer' ),
				'modules'     => [
					'enable_publish_missed_posts' => 1,
					'enable_post_cloner'          => 1,
					'manage_post_modified_date'   => 1,
					'enable_auto_add_anchor'      => 1,
				],
			],
			'membership'  => [
				'label'       => __( 'Membership / Multi-User', 'admin-optimizer' ),
				'description' => __( 'Manage subscribers, editors, and client access on multi-user sites.', 'admin-optimizer' ),
				'modules'     => [
					'enable_2fa'                       => 1,
					'enable_block_login'               => 1,
					'disable_user_account'             => 1,
					'enable_user_access_manager'       => 1,
					'enable_user_login_tracking'       => 1,
					'display_user_registration_date'   => 1,
					'disable_user_signup_notification' => 1,
					'hide_update_notices'              => 1,
				],
			],
		];
	}

	/**
	 * Register the "Quick Setup" nav tab, prepended so it appears first.
	 *
	 * @param array<string, array<string, mixed>> $nav_tab Existing tabs.
	 *
	 * @return array<string, array<string, mixed>>
	 */
	public function add_settings_navtab( array $nav_tab ): array {
		return array_merge(
			[
				'presets' => [
					'title'         => __( 'Quick Setup', 'admin-optimizer' ),
					'slug'          => 'adminoptim-presets',
					'custom_render' => [ $this, 'render_presets_tab' ],
				],
			],
			$nav_tab
		);
	}

	/**
	 * Render the presets tab content.
	 *
	 * @return void
	 */
	public function render_presets_tab(): void {
		$presets      = self::get_presets();
		$current_opts = (array) get_option( MODULES_OPTION, [] );
		$nonce        = wp_create_nonce( 'adminoptim_apply_preset' );
		?>
		<div class="adminoptim-presets-wrap">
			<div class="adminoptim-presets-intro">
				<h2 class="adminoptim-presets-intro__title"><?php esc_html_e( 'Quick Setup Presets', 'admin-optimizer' ); ?></h2>
				<p class="adminoptim-presets-intro__desc"><?php esc_html_e( 'Pick a preset to enable the right modules for your use case in one click. Presets are additive — they enable new modules without touching anything already on.', 'admin-optimizer' ); ?></p>
			</div>

			<?php if ( empty( $current_opts ) ) : ?>
		<div class="adminoptim-welcome-banner" id="adminoptim-welcome-banner">
			<div class="adminoptim-welcome-banner__body">
				<strong><?php esc_html_e( 'Welcome to Admin Optimizer!', 'admin-optimizer' ); ?></strong>
				<span><?php esc_html_e( 'No modules are enabled yet. Apply a preset below to get started in one click, or configure modules individually from the tabs on the left.', 'admin-optimizer' ); ?></span>
			</div>
			<button type="button" class="adminoptim-welcome-banner__dismiss" aria-label="<?php esc_attr_e( 'Dismiss', 'admin-optimizer' ); ?>">&#x2715;</button>
		</div>
		<?php endif; ?>

		<div id="adminoptim-preset-notice" class="adminoptim-preset-notice" role="status" aria-live="polite"></div>

			<div class="adminoptim-presets-grid">
				<?php foreach ( $presets as $key => $preset ) : ?>
					<?php
					$preset_modules = $preset['modules'];
					$total_count    = count( $preset_modules );
					$active_count   = 0;
					foreach ( array_keys( $preset_modules ) as $module_key ) {
						if ( ! empty( $current_opts[ $module_key ] ) ) {
							++$active_count;
						}
					}
					$is_fully_active = ( $active_count === $total_count );
					$is_partial      = ( $active_count > 0 && ! $is_fully_active );
					?>
					<div class="adminoptim-preset-card<?php echo $is_fully_active ? ' adminoptim-preset-card--active' : ''; ?>">

						<div class="adminoptim-preset-card__header">
							<?php if ( $is_fully_active ) : ?>
								<span class="adminoptim-preset-badge adminoptim-preset-badge--active"><?php esc_html_e( 'Active', 'admin-optimizer' ); ?></span>
							<?php elseif ( $is_partial ) : ?>
								<span class="adminoptim-preset-badge adminoptim-preset-badge--partial">
									<?php
									echo esc_html(
										sprintf(
											/* translators: 1: number of active modules, 2: total modules in preset */
											__( '%1$d / %2$d on', 'admin-optimizer' ),
											$active_count,
											$total_count
										)
									);
									?>
								</span>
							<?php endif; ?>
						</div>

						<h3 class="adminoptim-preset-card__title"><?php echo esc_html( $preset['label'] ); ?></h3>
						<p class="adminoptim-preset-card__desc"><?php echo esc_html( $preset['description'] ); ?></p>

						<details class="adminoptim-preset-card__details">
							<summary>
								<?php
								echo esc_html(
									sprintf(
										/* translators: %d: number of modules in this preset */
										_n( '%d module included', '%d modules included', $total_count, 'admin-optimizer' ),
										$total_count
									)
								);
								?>
							</summary>
							<ul class="adminoptim-preset-card__module-list">
								<?php foreach ( array_keys( $preset_modules ) as $module_key ) : ?>
									<li class="<?php echo ! empty( $current_opts[ $module_key ] ) ? 'adminoptim-module-on' : ''; ?>">
										<?php echo esc_html( self::get_module_label( $module_key ) ); ?>
									</li>
								<?php endforeach; ?>
							</ul>
						</details>

						<button
							type="button"
							class="button button-primary adminoptim-apply-preset-btn"
							data-preset="<?php echo esc_attr( $key ); ?>"
							data-nonce="<?php echo esc_attr( $nonce ); ?>"
							data-label-default="<?php esc_attr_e( 'Apply Preset', 'admin-optimizer' ); ?>"
							data-label-applying="<?php esc_attr_e( 'Applying…', 'admin-optimizer' ); ?>"
							<?php disabled( $is_fully_active ); ?>
						>
							<?php echo $is_fully_active ? esc_html__( 'Already Active', 'admin-optimizer' ) : esc_html__( 'Apply Preset', 'admin-optimizer' ); ?>
						</button>

					</div>
				<?php endforeach; ?>

				<?php $has_active_modules = ! empty( $current_opts ); ?>
				<div class="adminoptim-preset-card adminoptim-preset-card--danger">

					<div class="adminoptim-preset-card__header">
						<?php if ( ! $has_active_modules ) : ?>
							<span class="adminoptim-preset-badge adminoptim-preset-badge--disabled"><?php esc_html_e( 'Nothing active', 'admin-optimizer' ); ?></span>
						<?php endif; ?>
					</div>

					<h3 class="adminoptim-preset-card__title"><?php esc_html_e( 'Disable All Modules', 'admin-optimizer' ); ?></h3>
					<p class="adminoptim-preset-card__desc"><?php esc_html_e( 'Turn off every active module at once. Your individual module settings are preserved and can be re-enabled at any time.', 'admin-optimizer' ); ?></p>

					<button
						type="button"
						class="button adminoptim-apply-preset-btn adminoptim-reset-preset-btn"
						data-preset="reset"
						data-nonce="<?php echo esc_attr( $nonce ); ?>"
						data-label-default="<?php esc_attr_e( 'Disable All', 'admin-optimizer' ); ?>"
						data-label-applying="<?php esc_attr_e( 'Disabling…', 'admin-optimizer' ); ?>"
						<?php disabled( ! $has_active_modules ); ?>
					>
						<?php echo ! $has_active_modules ? esc_html__( 'Nothing to disable', 'admin-optimizer' ) : esc_html__( 'Disable All', 'admin-optimizer' ); ?>
					</button>

				</div>
			</div>

		</div>
		<?php
	}

	/**
	 * AJAX handler: merge a preset's modules into the saved options.
	 *
	 * @return void
	 */
	public function handle_apply_preset(): void {
		check_ajax_referer( 'adminoptim_apply_preset', 'nonce' );

		if ( ! current_user_can( 'manage_options' ) ) {
			wp_send_json_error( [ 'message' => __( 'Insufficient permissions.', 'admin-optimizer' ) ] );
		}

		$preset_key = sanitize_key( wp_unslash( $_POST['preset'] ?? '' ) );

		if ( 'reset' === $preset_key ) {
			update_option( MODULES_OPTION, [] );
			wp_send_json_success( [ 'message' => __( 'All modules disabled. Reloading…', 'admin-optimizer' ) ] );
		}

		$presets = self::get_presets();

		if ( ! isset( $presets[ $preset_key ] ) ) {
			wp_send_json_error( [ 'message' => __( 'Unknown preset.', 'admin-optimizer' ) ] );
		}

		$current = (array) get_option( MODULES_OPTION, [] );
		$merged  = array_merge( $current, $presets[ $preset_key ]['modules'] );
		update_option( MODULES_OPTION, $merged );

		wp_send_json_success(
			[
				'message' => sprintf(
					/* translators: %s: preset label */
					__( '"%s" preset applied successfully. Reloading…', 'admin-optimizer' ),
					$presets[ $preset_key ]['label']
				),
			]
		);
	}

	/**
	 * Localise the preset error strings onto the already-enqueued settings script.
	 *
	 * Runs on admin_enqueue_scripts so the handle is guaranteed to be registered
	 * before we call wp_localize_script.
	 *
	 * @return void
	 */
	public function localize_preset_script(): void {
		if ( ! $this->is_settings_page() ) {
			return;
		}

		wp_localize_script(
			'adminoptim-admin-settings',
			'adminoptimPresets',
			[
				'errorGeneric' => __( 'Something went wrong. Please try again.', 'admin-optimizer' ),
				'errorNetwork' => __( 'Request failed. Please check your connection and try again.', 'admin-optimizer' ),
			]
		);
	}

	/**
	 * Returns a human-readable label for a module option key.
	 *
	 * @param string $key Module option key.
	 *
	 * @return string
	 */
	private static function get_module_label( string $key ): string {
		$labels = [
			'disable_emojis'                    => __( 'Disable Emojis', 'admin-optimizer' ),
			'disable_jquery_migrate'            => __( 'Disable jQuery Migrate', 'admin-optimizer' ),
			'remove_rest_api_link'              => __( 'Remove REST API Link', 'admin-optimizer' ),
			'remove_rsd'                        => __( 'Remove RSD Link', 'admin-optimizer' ),
			'remove_shortlink'                  => __( 'Remove Shortlink', 'admin-optimizer' ),
			'remove_oembed'                     => __( 'Remove oEmbed', 'admin-optimizer' ),
			'remove_pingback_header'            => __( 'Remove Pingback Header', 'admin-optimizer' ),
			'remove_powered_by_header'          => __( 'Remove Powered-By Header', 'admin-optimizer' ),
			'enable_heartbeat_control'          => __( 'Heartbeat Control', 'admin-optimizer' ),
			'enable_db_cleaner'                 => __( 'Database Cleaner', 'admin-optimizer' ),
			'hide_wp_version'                   => __( 'Hide WP Version', 'admin-optimizer' ),
			'hide_update_notices'               => __( 'Hide Update Notices', 'admin-optimizer' ),
			'disable_xmlrpc'                    => __( 'Disable XML-RPC', 'admin-optimizer' ),
			'enable_custom_login_url'           => __( 'Custom Login URL', 'admin-optimizer' ),
			'enable_block_login'                => __( 'Block Failed Login', 'admin-optimizer' ),
			'enable_2fa'                        => __( 'Two Factor Authentication (2FA)', 'admin-optimizer' ),
			'enable_user_access_manager'        => __( 'User Access Manager', 'admin-optimizer' ),
			'enable_custom_post_types'          => __( 'Custom Post Types', 'admin-optimizer' ),
			'enable_custom_taxonomies'          => __( 'Custom Taxonomies', 'admin-optimizer' ),
			'enable_custom_post_status'         => __( 'Custom Post Status', 'admin-optimizer' ),
			'enable_svg_upload'                 => __( 'SVG Upload', 'admin-optimizer' ),
			'enable_page_ordering'              => __( 'Page Ordering', 'admin-optimizer' ),
			'enable_txt_management'             => __( 'Robots / Ads / App-Ads Txt', 'admin-optimizer' ),
			'enable_publish_missed_posts'       => __( 'Auto Publish Posts', 'admin-optimizer' ),
			'enable_post_cloner'                => __( 'Post Cloning', 'admin-optimizer' ),
			'manage_post_modified_date'         => __( 'Lock Post Modified Date', 'admin-optimizer' ),
			'enable_auto_add_anchor'            => __( 'Auto Add HTML Anchor', 'admin-optimizer' ),
			'disable_404_redirect'              => __( 'Disable 404 URL Redirect', 'admin-optimizer' ),
			'enable_image_alt_text'             => __( 'Set Image Filename as Alt Text', 'admin-optimizer' ),
			'enable_image_underscore_to_hyphen' => __( 'Convert Underscore to Hyphen in Filenames', 'admin-optimizer' ),
			'enable_limit_image_upload_size'    => __( 'Limit Image Upload File Size', 'admin-optimizer' ),
			'disable_category_archive'          => __( 'Disable Category Archive Page', 'admin-optimizer' ),
			'disable_tag_archive'               => __( 'Disable Tag Archive Page', 'admin-optimizer' ),
			'disable_author_archive'            => __( 'Disable Author Archive Page', 'admin-optimizer' ),
			'disable_date_archive'              => __( 'Disable Date Archive Page', 'admin-optimizer' ),
			'disable_gutenberg_editor'          => __( 'Disable Gutenberg Editor', 'admin-optimizer' ),
			'enable_smtp_mail'                  => __( 'SMTP Mail', 'admin-optimizer' ),
			'enable_user_login_tracking'        => __( 'Track User Last Login', 'admin-optimizer' ),
			'display_user_registration_date'    => __( 'Display User Registration Date', 'admin-optimizer' ),
			'disable_user_account'              => __( 'Disable User Account', 'admin-optimizer' ),
			'disable_user_signup_notification'  => __( 'Disable New User Notification', 'admin-optimizer' ),
			'enable_redirect_manager'           => __( 'Redirect Manager', 'admin-optimizer' ),
			'enable_custom_code'                => __( 'Custom Code Snippets', 'admin-optimizer' ),
			'enable_form_builder'               => __( 'Form Builder', 'admin-optimizer' ),
		];

		return $labels[ $key ] ?? ucwords( str_replace( '_', ' ', $key ) );
	}

	/**
	 * Whether the current admin page is the plugin's settings page.
	 *
	 * @return bool
	 */
	private function is_settings_page(): bool {
		$screen = get_current_screen();
		return $screen && 'toplevel_page_' . ADMINOPTIMIZER_MODULES_MENU_SLUG === $screen->id;
	}
}