<?php
/**
 * ==========================
 * 🔐 IGNY8 FILE RULE HEADER
 * ==========================
 * @file         : db.php
 * @location     : /core/db/db.php
 * @type         : Function Library
 * @scope        : Global
 * @allowed      : Database operations, schema management, data queries
 * @reusability  : Globally Reusable
 * @notes        : Central database operations and schema management
 */

// Prevent direct access
if (!defined('ABSPATH')) {
    exit;
}

/**
 * Clean up legacy database structures (if any exist from old installations)
 * 
 * This function handles cleanup of any legacy structures that might exist
 * from previous plugin versions, but all new installations use the correct schema.
 */
function igny8_cleanup_legacy_structures() {
    global $wpdb;
    
    $table_name = $wpdb->prefix . 'igny8_content_ideas';
    
    // Only run cleanup if table exists
    if (!$wpdb->get_var("SHOW TABLES LIKE '$table_name'")) {
        return true;
    }
    
    try {
        // Remove legacy priority column if it exists (from very old versions)
        $priority_exists = $wpdb->get_var("SHOW COLUMNS FROM `$table_name` LIKE 'priority'");
        if ($priority_exists) {
            // Remove index first if it exists
            $index_exists = $wpdb->get_var("SHOW INDEX FROM `$table_name` WHERE Key_name = 'idx_priority'");
            if ($index_exists) {
                $wpdb->query("ALTER TABLE `$table_name` DROP INDEX `idx_priority`");
            }
            
            // Drop the column
            $wpdb->query("ALTER TABLE `$table_name` DROP COLUMN `priority`");
            error_log('Igny8 Cleanup: Removed legacy priority column');
        }
        
        // Remove legacy ai_generated column if it exists (should be source now)
        $ai_generated_exists = $wpdb->get_var("SHOW COLUMNS FROM `$table_name` LIKE 'ai_generated'");
        if ($ai_generated_exists) {
            // Check if source column exists
            $source_exists = $wpdb->get_var("SHOW COLUMNS FROM `$table_name` LIKE 'source'");
            
            if (!$source_exists) {
                // Migrate data from ai_generated to source before dropping
                $wpdb->query("ALTER TABLE `$table_name` ADD COLUMN `source` ENUM('AI','Manual') DEFAULT 'Manual'");
                $wpdb->query("UPDATE `$table_name` SET source = CASE WHEN ai_generated = 1 THEN 'AI' ELSE 'Manual' END");
                error_log('Igny8 Cleanup: Migrated ai_generated to source field');
            }
            
            // Drop the old ai_generated column
            $wpdb->query("ALTER TABLE `$table_name` DROP COLUMN `ai_generated`");
            error_log('Igny8 Cleanup: Removed legacy ai_generated column');
        }
        
        // Update any old status values to new format
        $wpdb->query("UPDATE `$table_name` SET status = 'new' WHERE status NOT IN ('new','scheduled','published')");
        
        return true;
        
    } catch (Exception $e) {
        error_log('Igny8 Cleanup Error: ' . $e->getMessage());
        return false;
    }
}

/**
 * Check if legacy cleanup is needed
 */
function igny8_is_legacy_cleanup_needed() {
    global $wpdb;
    
    $table_name = $wpdb->prefix . 'igny8_content_ideas';
    
    // Check if table exists
    if (!$wpdb->get_var("SHOW TABLES LIKE '$table_name'")) {
        return false;
    }
    
    // Check for legacy columns
    $priority_exists = $wpdb->get_var("SHOW COLUMNS FROM `$table_name` LIKE 'priority'");
    $ai_generated_exists = $wpdb->get_var("SHOW COLUMNS FROM `$table_name` LIKE 'ai_generated'");
    
    return $priority_exists || $ai_generated_exists;
}

/**
 * Auto-run legacy cleanup on admin_init if needed
 */
function igny8_auto_run_legacy_cleanup() {
    if (current_user_can('manage_options') && igny8_is_legacy_cleanup_needed()) {
        igny8_cleanup_legacy_structures();
    }
}

// Hook to auto-run legacy cleanup (only for existing installations)
add_action('admin_init', 'igny8_auto_run_legacy_cleanup');

/**
 * Auto-run logs table migration on admin_init if needed
 */
function igny8_auto_run_logs_migration() {
    if (current_user_can('manage_options')) {
        igny8_migrate_logs_table();
    }
}

// Hook to auto-run logs migration (only for existing installations)
add_action('admin_init', 'igny8_auto_run_logs_migration');

/**
 * Remove old migration option on plugin activation
 */
function igny8_cleanup_migration_options() {
    delete_option('igny8_migration_ideas_schema_updated');
}

/**
 * ========================================================================
 * COMPLETE DATABASE SCHEMA CREATION
 * ========================================================================
 */

/**
 * Create all Igny8 database tables (15 tables total)
 */
function igny8_create_all_tables() {
    global $wpdb;
    $charset_collate = $wpdb->get_charset_collate();

    // Keywords table
    $sql = "CREATE TABLE {$wpdb->prefix}igny8_keywords (
        id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
        keyword VARCHAR(255) NOT NULL,
        search_volume INT UNSIGNED DEFAULT 0,
        difficulty INT UNSIGNED DEFAULT 0,
        cpc FLOAT DEFAULT 0.00,
        intent VARCHAR(50) DEFAULT 'informational',
        cluster_id BIGINT UNSIGNED DEFAULT NULL,
        sector_id BIGINT UNSIGNED DEFAULT NULL,
        mapped_post_id BIGINT UNSIGNED DEFAULT NULL,
        status ENUM('unmapped','mapped','queued','published') DEFAULT 'unmapped',
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
        PRIMARY KEY (id),
        UNIQUE KEY unique_keyword (keyword),
        KEY idx_cluster_id (cluster_id),
        KEY idx_sector_id (sector_id),
        KEY idx_mapped_post_id (mapped_post_id),
        KEY idx_status (status),
        KEY idx_created_at (created_at)
    ) $charset_collate;";
    dbDelta($sql);

    // Tasks table
    $sql = "CREATE TABLE {$wpdb->prefix}igny8_tasks (
        id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
        title VARCHAR(255) NOT NULL,
        description TEXT DEFAULT NULL,
        status ENUM('pending','in_progress','completed','cancelled','draft','queued','review','published') DEFAULT 'pending',
        priority ENUM('low','medium','high','urgent') DEFAULT 'medium',
        due_date DATETIME DEFAULT NULL,
        content_structure ENUM('cluster_hub','landing_page','guide_tutorial','how_to','comparison','review','top_listicle','question','product_description','service_page','home_page') DEFAULT 'cluster_hub',
        content_type ENUM('post','product','page','CPT') DEFAULT 'post',
        cluster_id BIGINT UNSIGNED DEFAULT NULL,
        keywords TEXT DEFAULT NULL,
        meta_title VARCHAR(255) DEFAULT NULL,
        meta_description TEXT DEFAULT NULL,
        word_count INT UNSIGNED DEFAULT 0,
        raw_ai_response LONGTEXT DEFAULT NULL,
        schedule_at DATETIME DEFAULT NULL,
        assigned_post_id BIGINT UNSIGNED DEFAULT NULL,
        idea_id BIGINT UNSIGNED DEFAULT NULL,
        ai_writer ENUM('ai','human') DEFAULT 'ai',
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        updated_at DATETIME DEFAULT CURRENT_TIMESTAMP,
        PRIMARY KEY (id),
        KEY idx_content_structure (content_structure),
        KEY idx_content_type (content_type),
        KEY idx_cluster_id (cluster_id),
        KEY idx_status (status),
        KEY idx_priority (priority),
        KEY idx_assigned_post_id (assigned_post_id),
        KEY idx_schedule_at (schedule_at),
        KEY idx_idea_id (idea_id),
        KEY idx_ai_writer (ai_writer),
        KEY idx_created_at (created_at)
    ) $charset_collate;";
    dbDelta($sql);

    // Data table for personalization
    $sql = "CREATE TABLE {$wpdb->prefix}igny8_data (
        id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
        post_id BIGINT UNSIGNED NOT NULL,
        data_type VARCHAR(50) NOT NULL,
        data JSON NOT NULL,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
        PRIMARY KEY (id),
        KEY idx_post_id (post_id),
        KEY idx_data_type (data_type),
        KEY idx_created_at (created_at)
    ) $charset_collate;";
    dbDelta($sql);

    // Personalization variations table - stores AI-generated personalized content
    $sql = "CREATE TABLE {$wpdb->prefix}igny8_variations (
        id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
        post_id BIGINT UNSIGNED NOT NULL,
        fields_hash CHAR(64) NOT NULL,
        fields_json LONGTEXT NOT NULL,
        content LONGTEXT NOT NULL,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        PRIMARY KEY (id),
        KEY idx_post_id (post_id),
        KEY idx_fields_hash (fields_hash),
        KEY idx_created_at (created_at),
        UNIQUE KEY unique_variation (post_id, fields_hash)
    ) $charset_collate;";
    dbDelta($sql);

    // Rankings table
    $sql = "CREATE TABLE {$wpdb->prefix}igny8_rankings (
        id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
        post_id BIGINT UNSIGNED NOT NULL,
        keyword VARCHAR(255) NOT NULL,
        impressions INT UNSIGNED DEFAULT 0,
        clicks INT UNSIGNED DEFAULT 0,
        ctr FLOAT DEFAULT 0.00,
        avg_position FLOAT DEFAULT NULL,
        source ENUM('gsc','ahrefs','manual') DEFAULT 'manual',
        fetched_at DATETIME DEFAULT CURRENT_TIMESTAMP,
        PRIMARY KEY (id),
        KEY idx_post_id (post_id),
        KEY idx_keyword (keyword),
        KEY idx_source (source),
        KEY idx_fetched_at (fetched_at)
    ) $charset_collate;";
    dbDelta($sql);

    // Suggestions table
    $sql = "CREATE TABLE {$wpdb->prefix}igny8_suggestions (
        id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
        post_id BIGINT UNSIGNED NOT NULL,
        cluster_id BIGINT UNSIGNED DEFAULT NULL,
        suggestion_type ENUM('internal_link','keyword_injection','rewrite') NOT NULL,
        payload JSON DEFAULT NULL,
        status ENUM('pending','applied','rejected') DEFAULT 'pending',
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        applied_at DATETIME DEFAULT NULL,
        PRIMARY KEY (id),
        KEY idx_post_id (post_id),
        KEY idx_cluster_id (cluster_id),
        KEY idx_suggestion_type (suggestion_type),
        KEY idx_status (status),
        KEY idx_created_at (created_at)
    ) $charset_collate;";
    dbDelta($sql);

    // Campaigns table
    $sql = "CREATE TABLE {$wpdb->prefix}igny8_campaigns (
        id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
        cluster_id BIGINT UNSIGNED DEFAULT NULL,
        target_post_id BIGINT UNSIGNED DEFAULT NULL,
        name VARCHAR(255) NOT NULL,
        status ENUM('active','completed','paused') DEFAULT 'active',
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        PRIMARY KEY (id),
        KEY idx_cluster_id (cluster_id),
        KEY idx_target_post_id (target_post_id),
        KEY idx_status (status),
        KEY idx_created_at (created_at)
    ) $charset_collate;";
    dbDelta($sql);

    // Content Ideas table
    $sql = "CREATE TABLE {$wpdb->prefix}igny8_content_ideas (
        id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
        idea_title VARCHAR(255) NOT NULL,
        idea_description LONGTEXT DEFAULT NULL,
        content_structure ENUM('cluster_hub','landing_page','guide_tutorial','how_to','comparison','review','top_listicle','question','product_description','service_page','home_page') DEFAULT 'cluster_hub',
        content_type ENUM('post','product','page','CPT') DEFAULT 'post',
        keyword_cluster_id BIGINT UNSIGNED DEFAULT NULL,
        status ENUM('new','scheduled','published') DEFAULT 'new',
        estimated_word_count INT UNSIGNED DEFAULT 0,
        target_keywords TEXT DEFAULT NULL,
        image_prompts TEXT DEFAULT NULL,
        source ENUM('AI','Manual') DEFAULT 'Manual',
        mapped_post_id BIGINT UNSIGNED DEFAULT NULL,
        tasks_count INT UNSIGNED DEFAULT 0,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
        PRIMARY KEY (id),
        KEY idx_idea_title (idea_title),
        KEY idx_content_structure (content_structure),
        KEY idx_content_type (content_type),
        KEY idx_status (status),
        KEY idx_keyword_cluster_id (keyword_cluster_id),
        KEY idx_mapped_post_id (mapped_post_id),
        KEY idx_created_at (created_at)
    ) $charset_collate;";
    dbDelta($sql);

    // Clusters table
    $sql = "CREATE TABLE {$wpdb->prefix}igny8_clusters (
        id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
        cluster_name VARCHAR(255) NOT NULL,
        sector_id BIGINT UNSIGNED DEFAULT NULL,
        cluster_term_id BIGINT UNSIGNED DEFAULT NULL,
        status ENUM('active','inactive','archived') DEFAULT 'active',
        keyword_count INT UNSIGNED DEFAULT 0,
        total_volume INT UNSIGNED DEFAULT 0,
        avg_difficulty DECIMAL(5,2) DEFAULT 0.00,
        mapped_pages_count INT UNSIGNED DEFAULT 0,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
        PRIMARY KEY (id),
        KEY idx_cluster_name (cluster_name),
        KEY idx_sector_id (sector_id),
        KEY idx_cluster_term_id (cluster_term_id),
        KEY idx_status (status),
        KEY idx_created_at (created_at)
    ) $charset_collate;";
    dbDelta($sql);

    // Sites table
    $sql = "CREATE TABLE {$wpdb->prefix}igny8_sites (
        id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
        site_url VARCHAR(500) NOT NULL,
        site_name VARCHAR(255) DEFAULT NULL,
        domain_authority INT UNSIGNED DEFAULT 0,
        referring_domains INT UNSIGNED DEFAULT 0,
        organic_traffic INT UNSIGNED DEFAULT 0,
        status ENUM('active','inactive','blocked') DEFAULT 'active',
        last_crawled DATETIME DEFAULT NULL,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
        PRIMARY KEY (id),
        UNIQUE KEY unique_site_url (site_url),
        KEY idx_domain_authority (domain_authority),
        KEY idx_status (status),
        KEY idx_last_crawled (last_crawled),
        KEY idx_created_at (created_at)
    ) $charset_collate;";
    dbDelta($sql);

    // Backlinks table
    $sql = "CREATE TABLE {$wpdb->prefix}igny8_backlinks (
        id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
        source_url VARCHAR(500) NOT NULL,
        target_url VARCHAR(500) NOT NULL,
        anchor_text VARCHAR(255) DEFAULT NULL,
        link_type ENUM('dofollow','nofollow','sponsored','ugc') DEFAULT 'dofollow',
        domain_authority INT UNSIGNED DEFAULT 0,
        page_authority INT UNSIGNED DEFAULT 0,
        status ENUM('pending','live','lost','disavowed') DEFAULT 'pending',
        campaign_id BIGINT UNSIGNED DEFAULT NULL,
        discovered_date DATE DEFAULT NULL,
        lost_date DATE DEFAULT NULL,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
        PRIMARY KEY (id),
        KEY idx_source_url (source_url(191)),
        KEY idx_target_url (target_url(191)),
        KEY idx_link_type (link_type),
        KEY idx_status (status),
        KEY idx_campaign_id (campaign_id),
        KEY idx_domain_authority (domain_authority),
        KEY idx_discovered_date (discovered_date),
        KEY idx_created_at (created_at)
    ) $charset_collate;";
    dbDelta($sql);

    // Mapping table
    $sql = "CREATE TABLE {$wpdb->prefix}igny8_mapping (
        id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
        source_type ENUM('keyword','cluster','idea','task') NOT NULL,
        source_id BIGINT UNSIGNED NOT NULL,
        target_type ENUM('post','page','product') NOT NULL,
        target_id BIGINT UNSIGNED NOT NULL,
        mapping_type ENUM('primary','secondary','related') DEFAULT 'primary',
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        PRIMARY KEY (id),
        KEY idx_source_type_id (source_type, source_id),
        KEY idx_target_type_id (target_type, target_id),
        KEY idx_mapping_type (mapping_type),
        KEY idx_created_at (created_at)
    ) $charset_collate;";
    dbDelta($sql);

    // Prompts table
    $sql = "CREATE TABLE {$wpdb->prefix}igny8_prompts (
        id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
        prompt_name VARCHAR(255) NOT NULL,
        prompt_type ENUM('content','optimization','generation','custom') DEFAULT 'content',
        prompt_text LONGTEXT NOT NULL,
        variables JSON DEFAULT NULL,
        is_active TINYINT(1) DEFAULT 1,
        usage_count INT UNSIGNED DEFAULT 0,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
        PRIMARY KEY (id),
        UNIQUE KEY unique_prompt_name (prompt_name),
        KEY idx_prompt_type (prompt_type),
        KEY idx_is_active (is_active),
        KEY idx_created_at (created_at)
    ) $charset_collate;";
    dbDelta($sql);

    // Logs table
    $sql = "CREATE TABLE {$wpdb->prefix}igny8_logs (
        id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
        event_type VARCHAR(191) NOT NULL,
        message TEXT NOT NULL,
        context LONGTEXT NULL,
        api_id VARCHAR(255) NULL,
        status VARCHAR(50) NULL,
        level VARCHAR(50) NULL,
        source VARCHAR(100) NULL,
        user_id BIGINT UNSIGNED NULL,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        PRIMARY KEY (id),
        KEY idx_event_type (event_type),
        KEY idx_created_at (created_at),
        KEY idx_source (source),
        KEY idx_status (status),
        KEY idx_user_id (user_id)
    ) $charset_collate;";
    dbDelta($sql);

    // AI Queue table
    $sql = "CREATE TABLE {$wpdb->prefix}igny8_ai_queue (
        id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
        action VARCHAR(50) NOT NULL,
        data LONGTEXT NOT NULL,
        user_id BIGINT UNSIGNED NOT NULL,
        status ENUM('pending','processing','completed','failed') DEFAULT 'pending',
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        processed_at TIMESTAMP NULL,
        result LONGTEXT NULL,
        error_message TEXT NULL,
        PRIMARY KEY (id),
        KEY idx_user_id (user_id),
        KEY idx_status (status),
        KEY idx_action (action),
        KEY idx_created_at (created_at)
    ) $charset_collate;";
    dbDelta($sql);

    // Update database version
    update_option('igny8_db_version', '0.1');
}


/**
 * Register Igny8 taxonomies with WordPress
 */
function igny8_register_taxonomies() {
    // Register sectors taxonomy (hierarchical) - only if not exists
    if (!taxonomy_exists('sectors')) {
        register_taxonomy('sectors', ['post', 'page', 'product'], [
        'hierarchical' => true,
        'labels' => [
            'name' => 'Sectors',
            'singular_name' => 'Sector',
            'menu_name' => 'Sectors',
            'all_items' => 'All Sectors',
            'edit_item' => 'Edit Sector',
            'view_item' => 'View Sector',
            'update_item' => 'Update Sector',
            'add_new_item' => 'Add New Sector',
            'new_item_name' => 'New Sector Name',
            'parent_item' => 'Parent Sector',
            'parent_item_colon' => 'Parent Sector:',
            'search_items' => 'Search Sectors',
            'popular_items' => 'Popular Sectors',
            'separate_items_with_commas' => 'Separate sectors with commas',
            'add_or_remove_items' => 'Add or remove sectors',
            'choose_from_most_used' => 'Choose from most used sectors',
            'not_found' => 'No sectors found',
        ],
        'public' => true,
        'show_ui' => true,
        'show_admin_column' => true,
        'show_in_nav_menus' => true,
        'show_tagcloud' => true,
        'show_in_rest' => true,
        'rewrite' => [
            'slug' => 'sectors',
            'with_front' => false,
        ],
        'capabilities' => [
            'manage_terms' => 'manage_categories',
            'edit_terms' => 'manage_categories',
            'delete_terms' => 'manage_categories',
            'assign_terms' => 'edit_posts',
        ],
        ]);
    }
    
    // Register clusters taxonomy (hierarchical) - only if not exists
    if (!taxonomy_exists('clusters')) {
        register_taxonomy('clusters', ['post', 'page', 'product'], [
        'hierarchical' => true,
        'labels' => [
            'name' => 'Content Clusters',
            'singular_name' => 'Cluster',
            'menu_name' => 'Clusters',
            'all_items' => 'All Clusters',
            'edit_item' => 'Edit Cluster',
            'view_item' => 'View Cluster',
            'update_item' => 'Update Cluster',
            'add_new_item' => 'Add New Cluster',
            'new_item_name' => 'New Cluster Name',
            'parent_item' => 'Parent Cluster',
            'parent_item_colon' => 'Parent Cluster:',
            'search_items' => 'Search Clusters',
            'popular_items' => 'Popular Clusters',
            'separate_items_with_commas' => 'Separate clusters with commas',
            'add_or_remove_items' => 'Add or remove clusters',
            'choose_from_most_used' => 'Choose from most used clusters',
            'not_found' => 'No clusters found',
        ],
        'public' => true,
        'show_ui' => true,
        'show_admin_column' => true,
        'show_in_nav_menus' => true,
        'show_tagcloud' => true,
        'show_in_rest' => true,
        'rewrite' => [
            'slug' => 'clusters',
            'with_front' => false,
        ],
        'capabilities' => [
            'manage_terms' => 'manage_categories',
            'edit_terms' => 'manage_categories',
            'delete_terms' => 'manage_categories',
            'assign_terms' => 'edit_posts',
        ],
        ]);
    }
}

// ==========================================================
// SEO: Prevent indexing of Cluster and Sector taxonomy pages
// ==========================================================
add_action('wp_head', function() {
    if (is_tax(['clusters', 'sectors'])) {
        echo '<meta name="robots" content="noindex,follow" />' . "\n";
    }
}, 1);

/**
 * Register Igny8 post meta fields with WordPress
 */
function igny8_register_post_meta() {
    $post_types = ['post', 'page', 'product'];

    // Define all meta fields with proper schema for REST API
    $meta_fields = [
        '_igny8_cluster_id' => [
            'type'        => 'integer',
            'description' => 'Assigns content to a cluster',
            'single'      => true,
            'show_in_rest'=> true,
        ],
        '_igny8_keyword_ids' => [
            'type'        => 'array',
            'description' => 'Maps multiple keywords to content',
            'single'      => true,
            'show_in_rest'=> [
                'schema' => [
                    'type'  => 'array',
                    'items' => [
                        'type' => 'integer'
                    ]
                ]
            ]
        ],
        '_igny8_task_id' => [
            'type'        => 'integer',
            'description' => 'Links WP content back to Writer task',
            'single'      => true,
            'show_in_rest'=> true,
        ],
        '_igny8_campaign_ids' => [
            'type'        => 'array',
            'description' => 'Associates content with backlink campaigns',
            'single'      => true,
            'show_in_rest'=> [
                'schema' => [
                    'type'  => 'array',
                    'items' => [
                        'type' => 'integer'
                    ]
                ]
            ]
        ],
        '_igny8_backlink_count' => [
            'type'        => 'integer',
            'description' => 'Quick summary count of backlinks to content',
            'single'      => true,
            'show_in_rest'=> true,
        ],
        '_igny8_last_optimized' => [
            'type'        => 'string',
            'description' => 'Tracks last optimization timestamp',
            'single'      => true,
            'show_in_rest'=> true,
        ],
        '_igny8_meta_title' => [
            'type'        => 'string',
            'description' => 'SEO meta title for the content',
            'single'      => true,
            'show_in_rest'=> true,
        ],
        '_igny8_meta_description' => [
            'type'        => 'string',
            'description' => 'SEO meta description for the content',
            'single'      => true,
            'show_in_rest'=> true,
        ],
        '_igny8_primary_keywords' => [
            'type'        => 'string',
            'description' => 'Primary keywords for the content',
            'single'      => true,
            'show_in_rest'=> true,
        ],
        '_igny8_secondary_keywords' => [
            'type'        => 'string',
            'description' => 'Secondary keywords for the content',
            'single'      => true,
            'show_in_rest'=> true,
        ],
    ];

    // Register each meta field for all relevant post types
    foreach ($meta_fields as $meta_key => $config) {
        foreach ($post_types as $post_type) {
            register_post_meta($post_type, $meta_key, $config);
        }
    }
}

/**
 * Set default plugin options
 */
function igny8_set_default_options() {
    // Set default options if they don't exist
    if (!get_option('igny8_api_key')) {
        add_option('igny8_api_key', '');
    }
    if (!get_option('igny8_ai_enabled')) {
        add_option('igny8_ai_enabled', 1);
    }
    if (!get_option('igny8_debug_enabled')) {
        add_option('igny8_debug_enabled', 0);
    }
    if (!get_option('igny8_monitoring_enabled')) {
        add_option('igny8_monitoring_enabled', 1);
    }
    if (!get_option('igny8_version')) {
        add_option('igny8_version', '0.1');
    }
}

/**
 * Migrate logs table to add missing columns for OpenAI API logging
 */
function igny8_migrate_logs_table() {
    global $wpdb;
    
    $table_name = $wpdb->prefix . 'igny8_logs';
    
    // Check if table exists
    if (!$wpdb->get_var("SHOW TABLES LIKE '$table_name'")) {
        return true;
    }
    
    // Check if migration is needed
    $columns = $wpdb->get_results("SHOW COLUMNS FROM $table_name");
    $column_names = array_column($columns, 'Field');
    
    $needed_columns = ['api_id', 'status', 'level', 'source', 'user_id'];
    $missing_columns = array_diff($needed_columns, $column_names);
    
    if (empty($missing_columns)) {
        return true; // Migration not needed
    }
    
    try {
        // Add missing columns
        if (in_array('api_id', $missing_columns)) {
            $wpdb->query("ALTER TABLE `$table_name` ADD COLUMN `api_id` VARCHAR(255) NULL");
        }
        if (in_array('status', $missing_columns)) {
            $wpdb->query("ALTER TABLE `$table_name` ADD COLUMN `status` VARCHAR(50) NULL");
        }
        if (in_array('level', $missing_columns)) {
            $wpdb->query("ALTER TABLE `$table_name` ADD COLUMN `level` VARCHAR(50) NULL");
        }
        if (in_array('source', $missing_columns)) {
            $wpdb->query("ALTER TABLE `$table_name` ADD COLUMN `source` VARCHAR(100) NULL");
        }
        if (in_array('user_id', $missing_columns)) {
            $wpdb->query("ALTER TABLE `$table_name` ADD COLUMN `user_id` BIGINT UNSIGNED NULL");
        }
        
        // Add indexes for new columns
        $indexes_to_add = [
            'source' => "ALTER TABLE `$table_name` ADD INDEX `idx_source` (`source`)",
            'status' => "ALTER TABLE `$table_name` ADD INDEX `idx_status` (`status`)",
            'user_id' => "ALTER TABLE `$table_name` ADD INDEX `idx_user_id` (`user_id`)"
        ];
        
        foreach ($indexes_to_add as $column => $sql) {
            if (in_array($column, $missing_columns)) {
                $wpdb->query($sql);
            }
        }
        
        error_log('Igny8: Logs table migration completed successfully');
        return true;
        
    } catch (Exception $e) {
        error_log('Igny8 Logs Migration Error: ' . $e->getMessage());
        return false;
    }
}

/**
 * Complete plugin installation function
 */
function igny8_install_database() {
    // Create all database tables
    igny8_create_all_tables();
    
    // Migrate logs table if needed
    igny8_migrate_logs_table();
    
    // Register taxonomies
    igny8_register_taxonomies();
    
    // Register post meta fields
    igny8_register_post_meta();
    
    // Set default options
    igny8_set_default_options();
    
    // Update version
    update_option('igny8_version', '0.1');
    update_option('igny8_db_version', '0.1');
    
    // Add word_count field to tasks table if it doesn't exist
    igny8_add_word_count_to_tasks();
    
    // Add raw_ai_response field to tasks table if it doesn't exist
    igny8_add_raw_ai_response_to_tasks();
    
    // Add tasks_count field to content_ideas table if it doesn't exist
    igny8_add_tasks_count_to_content_ideas();
    
    // Add image_prompts field to content_ideas table if it doesn't exist
    igny8_add_image_prompts_to_content_ideas();
    
    // Update idea_description field to LONGTEXT for structured JSON descriptions
    igny8_update_idea_description_to_longtext();
    
    // Migrate ideas and tasks table structure
    igny8_migrate_ideas_tasks_structure();
    
    // Run legacy cleanup if needed
    igny8_cleanup_legacy_structures();
}

/**
 * Add word_count field to tasks table if it doesn't exist
 */
function igny8_add_word_count_to_tasks() {
    global $wpdb;
    
    // Check if word_count column exists
    $column_exists = $wpdb->get_results("SHOW COLUMNS FROM {$wpdb->prefix}igny8_tasks LIKE 'word_count'");
    
    if (empty($column_exists)) {
        // Add word_count column
        $wpdb->query("ALTER TABLE {$wpdb->prefix}igny8_tasks ADD COLUMN word_count INT UNSIGNED DEFAULT 0 AFTER keywords");
        error_log('Igny8: Added word_count column to tasks table');
    }
}

/**
 * Add raw_ai_response field to tasks table if it doesn't exist
 */
function igny8_add_raw_ai_response_to_tasks() {
    global $wpdb;
    
    $column_exists = $wpdb->get_results("SHOW COLUMNS FROM {$wpdb->prefix}igny8_tasks LIKE 'raw_ai_response'");
    
    if (empty($column_exists)) {
        // Add raw_ai_response column
        $wpdb->query("ALTER TABLE {$wpdb->prefix}igny8_tasks ADD COLUMN raw_ai_response LONGTEXT DEFAULT NULL AFTER word_count");
        error_log('Igny8: Added raw_ai_response column to tasks table');
    }
}

/**
 * Add tasks_count field to content_ideas table if it doesn't exist
 */
function igny8_add_tasks_count_to_content_ideas() {
    global $wpdb;
    
    // Check if tasks_count column exists
    $column_exists = $wpdb->get_results("SHOW COLUMNS FROM {$wpdb->prefix}igny8_content_ideas LIKE 'tasks_count'");
    
    if (empty($column_exists)) {
        // Add tasks_count column
        $wpdb->query("ALTER TABLE {$wpdb->prefix}igny8_content_ideas ADD COLUMN tasks_count INT UNSIGNED DEFAULT 0 AFTER mapped_post_id");
        error_log('Igny8: Added tasks_count column to content_ideas table');
    }
}

/**
 * Add image_prompts field to content_ideas table if it doesn't exist
 */
function igny8_add_image_prompts_to_content_ideas() {
    global $wpdb;
    
    // Check if image_prompts column exists
    $column_exists = $wpdb->get_results("SHOW COLUMNS FROM {$wpdb->prefix}igny8_content_ideas LIKE 'image_prompts'");
    
    if (empty($column_exists)) {
        // Add image_prompts column
        $wpdb->query("ALTER TABLE {$wpdb->prefix}igny8_content_ideas ADD COLUMN image_prompts TEXT DEFAULT NULL AFTER target_keywords");
        error_log('Igny8: Added image_prompts column to content_ideas table');
    }
}

/**
 * Update idea_description field to LONGTEXT to support structured JSON descriptions
 */
function igny8_update_idea_description_to_longtext() {
    global $wpdb;
    
    // Check current column type
    $column_info = $wpdb->get_results("SHOW COLUMNS FROM {$wpdb->prefix}igny8_content_ideas LIKE 'idea_description'");
    
    if (!empty($column_info)) {
        $column_type = $column_info[0]->Type;
        
        // Only update if it's not already LONGTEXT
        if (strpos(strtoupper($column_type), 'LONGTEXT') === false) {
            $wpdb->query("ALTER TABLE {$wpdb->prefix}igny8_content_ideas MODIFY COLUMN idea_description LONGTEXT DEFAULT NULL");
            error_log('Igny8: Updated idea_description column to LONGTEXT');
        }
    }
}

/**
 * Migrate ideas and tasks table structure
 */
function igny8_migrate_ideas_tasks_structure() {
    global $wpdb;
    
    // Migrate ideas table
    igny8_migrate_ideas_table();
    
    // Migrate tasks table
    igny8_migrate_tasks_table();
}

/**
 * Migrate ideas table structure
 */
function igny8_migrate_ideas_table() {
    global $wpdb;
    
    // Check if idea_type column exists (old column) and remove it
    $old_column_exists = $wpdb->get_results("SHOW COLUMNS FROM {$wpdb->prefix}igny8_content_ideas LIKE 'idea_type'");
    if (!empty($old_column_exists)) {
        // Drop the old idea_type column
        $wpdb->query("ALTER TABLE {$wpdb->prefix}igny8_content_ideas DROP COLUMN idea_type");
        error_log('Igny8: Removed idea_type column from ideas table');
    }
    
    // Check if content_structure column exists
    $column_exists = $wpdb->get_results("SHOW COLUMNS FROM {$wpdb->prefix}igny8_content_ideas LIKE 'content_structure'");
    
    if (empty($column_exists)) {
        // Add content_structure column with new options
        $wpdb->query("ALTER TABLE {$wpdb->prefix}igny8_content_ideas ADD COLUMN content_structure ENUM('cluster_hub','landing_page','guide_tutorial','how_to','comparison','review','top_listicle','question','product_description','service_page','home_page') DEFAULT 'cluster_hub' AFTER idea_description");
        error_log('Igny8: Added content_structure column to ideas table');
    } else {
        // Update existing content_structure column with new options
        $wpdb->query("ALTER TABLE {$wpdb->prefix}igny8_content_ideas MODIFY COLUMN content_structure ENUM('cluster_hub','landing_page','guide_tutorial','how_to','comparison','review','top_listicle','question','product_description','service_page','home_page') DEFAULT 'cluster_hub'");
        error_log('Igny8: Updated content_structure column options in ideas table');
    }
    
    // Check if content_type column exists
    $content_type_exists = $wpdb->get_results("SHOW COLUMNS FROM {$wpdb->prefix}igny8_content_ideas LIKE 'content_type'");
    
    if (empty($content_type_exists)) {
        // Add content_type column
        $wpdb->query("ALTER TABLE {$wpdb->prefix}igny8_content_ideas ADD COLUMN content_type ENUM('post','product','page','CPT') DEFAULT 'post' AFTER content_structure");
        error_log('Igny8: Added content_type column to ideas table');
    }
    
    // Update indexes
    $wpdb->query("ALTER TABLE {$wpdb->prefix}igny8_content_ideas DROP INDEX IF EXISTS idx_idea_type");
    $wpdb->query("ALTER TABLE {$wpdb->prefix}igny8_content_ideas ADD INDEX idx_content_structure (content_structure)");
    $wpdb->query("ALTER TABLE {$wpdb->prefix}igny8_content_ideas ADD INDEX idx_content_type (content_type)");
}

/**
 * Migrate tasks table structure
 */
function igny8_migrate_tasks_table() {
    global $wpdb;
    
    // Check if content_structure column exists
    $column_exists = $wpdb->get_results("SHOW COLUMNS FROM {$wpdb->prefix}igny8_tasks LIKE 'content_structure'");
    
    if (empty($column_exists)) {
        // Check if content_type column exists (old column)
        $old_column_exists = $wpdb->get_results("SHOW COLUMNS FROM {$wpdb->prefix}igny8_tasks LIKE 'content_type'");
        
        if (!empty($old_column_exists)) {
            // Rename content_type to content_structure with new options
            $wpdb->query("ALTER TABLE {$wpdb->prefix}igny8_tasks CHANGE COLUMN content_type content_structure ENUM('cluster_hub','landing_page','guide_tutorial','how_to','comparison','review','top_listicle','question','product_description','service_page','home_page') DEFAULT 'cluster_hub'");
            error_log('Igny8: Renamed content_type to content_structure in tasks table');
        } else {
            // Add content_structure column with new options
            $wpdb->query("ALTER TABLE {$wpdb->prefix}igny8_tasks ADD COLUMN content_structure ENUM('cluster_hub','landing_page','guide_tutorial','how_to','comparison','review','top_listicle','question','product_description','service_page','home_page') DEFAULT 'cluster_hub' AFTER due_date");
            error_log('Igny8: Added content_structure column to tasks table');
        }
    } else {
        // Update existing content_structure column with new options
        $wpdb->query("ALTER TABLE {$wpdb->prefix}igny8_tasks MODIFY COLUMN content_structure ENUM('cluster_hub','landing_page','guide_tutorial','how_to','comparison','review','top_listicle','question','product_description','service_page','home_page') DEFAULT 'cluster_hub'");
        error_log('Igny8: Updated content_structure column options in tasks table');
    }
    
    // Check if content_type column exists (new column)
    $content_type_exists = $wpdb->get_results("SHOW COLUMNS FROM {$wpdb->prefix}igny8_tasks LIKE 'content_type'");
    
    if (empty($content_type_exists)) {
        // Add content_type column
        $wpdb->query("ALTER TABLE {$wpdb->prefix}igny8_tasks ADD COLUMN content_type ENUM('post','product','page','CPT') DEFAULT 'post' AFTER content_structure");
        error_log('Igny8: Added content_type column to tasks table');
    }
    
    // Update indexes
    $wpdb->query("ALTER TABLE {$wpdb->prefix}igny8_tasks DROP INDEX IF EXISTS idx_content_type");
    $wpdb->query("ALTER TABLE {$wpdb->prefix}igny8_tasks ADD INDEX idx_content_structure (content_structure)");
    $wpdb->query("ALTER TABLE {$wpdb->prefix}igny8_tasks ADD INDEX idx_content_type (content_type)");
}