<?php
/**
 * Fired when the plugin is uninstalled.
 *
 * Removes ALL plugin data from the WordPress site:
 *  - Custom database tables (v2 unified link system + legacy module tables)
 *  - Plugin options (settings, SaaS credentials, job state, migration version, etc.)
 *  - Post meta keys written by the plugin
 *  - Transients / cached data
 *  - Scheduled WP-Cron events
 *
 * NOTE: This only cleans the WordPress side. SaaS-side data (indexed documents
 * on api.linkmesh.co) is intentionally NOT touched on uninstall.
 *
 * @package AILinkMaster
 */

if ( ! defined( 'WP_UNINSTALL_PLUGIN' ) ) {
    exit;
}

global $wpdb;

/*
 * ===========================================================================
 * 1. CUSTOM DATABASE TABLES
 * ===========================================================================
 *
 * Tables created by the plugin (see includes/class-ailm-link-db.php and the
 * module DB classes). All five are dropped on uninstall.
 *
 *   wp_ailm_link_rules   — v2 injection rules (intent)        [AILM_Link_DB]
 *   wp_ailm_links        — v2 scanned link reality            [AILM_Link_DB]
 *   wp_ailm_sync_queue   — v2 async SaaS replication queue    [AILM_Link_DB]
 *   wp_ailm_link_monitor — 404 Scout link monitor (legacy)    [AILM_Scout_DB]
 *   wp_ailm_click_stats  — Click analytics                    [AILM_Clicks_DB]
 */
$ailm_tables_to_drop = [
    $wpdb->prefix . 'ailm_link_rules',
    $wpdb->prefix . 'ailm_links',
    $wpdb->prefix . 'ailm_sync_queue',
    $wpdb->prefix . 'ailm_link_monitor',
    $wpdb->prefix . 'ailm_click_stats',
];

foreach ( $ailm_tables_to_drop as $ailm_table ) {
    $ailm_table_esc = esc_sql( $ailm_table );
    // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching, WordPress.DB.PreparedSQL.InterpolatedNotPrepared, WordPress.DB.DirectDatabaseQuery.SchemaChange, PluginCheck.Security.DirectDB.UnescapedDBParameter
    $wpdb->query( "DROP TABLE IF EXISTS {$ailm_table_esc}" );
}

/*
 * ===========================================================================
 * 2. PLUGIN OPTIONS
 * ===========================================================================
 *
 * Grouped by subsystem for maintainability. Each option is deleted from both
 * the options table (single site) and the sitemeta table (multisite).
 */
$ailm_options_to_delete = [

    // --- Core linking settings (admin/class-ailm-settings-tab.php) ---
    'ailm_mode',
    'ailm_hybrid_days',
    'ailm_debug_mode',
    'ailm_exclude_urls',
    'ailm_global_limit',
    'ailm_target_limit',
    'ailm_min_chars',
    'ailm_skip_chars',
    'ailm_min_gap',
    'ailm_cache_hours',
    'ailm_pool_size',
    'ailm_enable_utm',
    'ailm_utm_source',
    'ailm_utm_medium',
    'ailm_utm_campaign',
    'ailm_count_manual_links',
    'ailm_auto_index',
    'ailm_allowed_post_types',
    'ailm_blacklisted_posts',
    'ailm_excluded_terms',
    'ailm_excluded_html',
    'ailm_silo_taxonomies',
    'ailm_rules',

    // --- SaaS / license / account (LinkMesh cloud) ---
    'ailm_saas_license_key',
    'ailm_saas_server_url',
    'linkmesh_tokens_balance',
    'linkmesh_index_limit_reached',

    // --- Freeze job state (admin/class-ailm-admin.php) ---
    'ailm_freeze_job_status',
    'ailm_freeze_job_total_posts',
    'ailm_freeze_job_processed_posts',
    'ailm_freeze_job_post_ids',
    'ailm_freeze_job_token',

    // --- Bulk import job state (includes/class-ailm-import-existing.php) ---
    'ailm_import_token',
    'ailm_import_last_post_id',
    'ailm_import_total_posts',
    'ailm_import_processed_posts',
    'ailm_import_links_registered',
    'ailm_import_links_found',
    'ailm_import_running',
    'ailm_import_status_text',
    'ailm_import_last_heartbeat',
    'ailm_import_batch_lock',

    // --- 404 Scout scan job state (modules/404-scout/...) ---
    'ailm_scout_job_token',
    'ailm_scout_job_phase',
    'ailm_scout_last_post_id',
    'ailm_scout_total_posts',
    'ailm_scout_processed_posts',
    'ailm_scout_status_text',
    'ailm_scout_scan_running',

    // --- Sync banner dismiss flag (admin/class-ailm-admin.php) ---
    'ailm_sync_banner_dismissed',

    // --- Orphan Rescue settings (modules/orphan-rescue/...) ---
    'ailm_orphan_stop_words',

    // --- Semantic Engine batch state (modules/semantic-engine/...) ---
    'ailm_active_batches',

    // --- Data migration version (includes/class-ailm-migrator.php) ---
    'ailm_db_version',
];

foreach ( $ailm_options_to_delete as $ailm_option ) {
    delete_option( $ailm_option );
    delete_site_option( $ailm_option );
}

/*
 * ===========================================================================
 * 3. POST META
 * ===========================================================================
 *
 * Keys written by the plugin across posts. delete_post_meta_by_key() removes
 * every occurrence site-wide.
 *
 *   _ailm_frozen_map    — legacy v1 frozen link map (migrated to rules in v2)
 *   _ailm_inbound_count — cached inbound link count per target post
 *   _ailm_is_indexed    — SaaS indexing state flag per donor post
 *   _ailm_pagerank      — cached PageRank score per post (modules/pagerank)
 */
$ailm_post_meta_keys = [
    '_ailm_frozen_map',
    '_ailm_inbound_count',
    '_ailm_is_indexed',
    '_ailm_pagerank',
];

foreach ( $ailm_post_meta_keys as $ailm_meta_key ) {
    delete_post_meta_by_key( $ailm_meta_key );
}

/*
 * ===========================================================================
 * 4. TRANSIENTS / CACHED DATA
 * ===========================================================================
 *
 * Named transients used by the plugin:
 *   ailm_pr_graph        — PageRank graph cache (modules/pagerank)
 *   ailm_ki_current_scan — Keyword Intelligence active scan (modules/keyword-intelligence)
 *
 * Plus wildcard cleanup for the link pool / simulation transients, which use
 * dynamic keys (ailm_pool_*, simulation_id-based, _transient_ailm_*).
 */
delete_transient( 'ailm_pr_graph' );
delete_transient( 'ailm_ki_current_scan' );

// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
$wpdb->query(
    $wpdb->prepare(
        "DELETE FROM {$wpdb->options} WHERE option_name LIKE %s OR option_name LIKE %s",
        '_transient_ailm_%',
        '_transient_timeout_ailm_%'
    )
);

/*
 * ===========================================================================
 * 5. SCHEDULED WP-CRON EVENTS
 * ===========================================================================
 *
 * Cron hooks registered by the plugin. wp_clear_scheduled_hook() removes all
 * scheduled instances of each hook.
 *
 *   ailm_sync_queue_cron       — SaaS replication worker (includes/class-ailm-sync-queue.php)
 *   ailm_import_cron_batch     — Bulk import batch processor (includes/class-ailm-import-existing.php)
 *   ailm_cleanup_stale_batches — Semantic Engine stale-batch cleanup (modules/semantic-engine)
 */
$ailm_cron_hooks = [
    'ailm_sync_queue_cron',
    'ailm_import_cron_batch',
    'ailm_cleanup_stale_batches',
];

foreach ( $ailm_cron_hooks as $ailm_cron_hook ) {
    wp_clear_scheduled_hook( $ailm_cron_hook );
}