<?php

defined('BASEPATH') or exit('No direct script access allowed');

/**
 * Desk-Moloni Module Database Installation
 * 
 * This file contains all database-related installation functions
 * for the Desk-Moloni module including table creation, default
 * settings, and data initialization.
 * 
 * @package    DeskMoloni
 * @subpackage Database
 * @version    3.0.0
 * @author     Descomplicar®
 */

/**
 * Create all necessary database tables
 */
function desk_moloni_create_tables()
{
    $CI = &get_instance();
    
    // Create sync queue table
    desk_moloni_create_sync_queue_table();
    
    // Create sync logs table
    desk_moloni_create_sync_logs_table();
    
    // Create entity mappings table
    desk_moloni_create_entity_mappings_table();
    
    // Create sync rules table
    desk_moloni_create_sync_rules_table();
    
    // Create webhook logs table
    desk_moloni_create_webhook_logs_table();
    
    // Create performance metrics table
    desk_moloni_create_performance_metrics_table();
    
    // Create error logs table
    desk_moloni_create_error_logs_table();
    
    // Create configuration table
    desk_moloni_create_configuration_table();
    
    // Create config table (for tests and existing model compatibility)
    desk_moloni_create_config_table();
    
    // Create mapping table (for tests and existing model compatibility)
    desk_moloni_create_mapping_table();
    
    // Create sync log table (for tests and existing model compatibility)
    desk_moloni_create_sync_log_table();
    
    // Create API tokens table
    desk_moloni_create_api_tokens_table();
    
    // Create document cache table
    desk_moloni_create_document_cache_table();
    
    log_activity('Desk-Moloni: Database tables created successfully');
}

/**
 * Create sync queue table
 */
function desk_moloni_create_sync_queue_table()
{
    $CI = &get_instance();
    
    $sql = "CREATE TABLE IF NOT EXISTS `" . db_prefix() . "deskmoloni_sync_queue` (
        `id` int(11) NOT NULL AUTO_INCREMENT,
        `entity_type` varchar(50) NOT NULL,
        `entity_id` int(11) NOT NULL,
        `perfex_id` int(11) DEFAULT NULL,
        `moloni_id` int(11) DEFAULT NULL,
        `action` enum('create','update','delete','sync') NOT NULL DEFAULT 'sync',
        `direction` enum('perfex_to_moloni','moloni_to_perfex','bidirectional') NOT NULL DEFAULT 'bidirectional',
        `priority` enum('low','normal','high','critical') NOT NULL DEFAULT 'normal',
        `status` enum('pending','processing','completed','failed','cancelled') NOT NULL DEFAULT 'pending',
        `attempts` int(11) NOT NULL DEFAULT 0,
        `max_attempts` int(11) NOT NULL DEFAULT 3,
        `data` longtext DEFAULT NULL COMMENT 'JSON data for sync',
        `error_message` text DEFAULT NULL,
        `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
        `updated_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
        `scheduled_at` timestamp NULL DEFAULT NULL,
        `started_at` timestamp NULL DEFAULT NULL,
        `completed_at` timestamp NULL DEFAULT NULL,
        `created_by` int(11) DEFAULT NULL,
        PRIMARY KEY (`id`),
        KEY `idx_entity_type_id` (`entity_type`, `entity_id`),
        KEY `idx_status_priority` (`status`, `priority`),
        KEY `idx_scheduled_at` (`scheduled_at`),
        KEY `idx_perfex_id` (`perfex_id`),
        KEY `idx_moloni_id` (`moloni_id`),
        KEY `idx_created_by` (`created_by`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;";
    
    $CI->db->query($sql);
}

/**
 * Create sync logs table
 */
function desk_moloni_create_sync_logs_table()
{
    $CI = &get_instance();
    
    $sql = "CREATE TABLE IF NOT EXISTS `" . db_prefix() . "deskmoloni_sync_logs` (
        `id` int(11) NOT NULL AUTO_INCREMENT,
        `queue_id` int(11) DEFAULT NULL,
        `entity_type` varchar(50) NOT NULL,
        `entity_id` int(11) NOT NULL,
        `action` varchar(50) NOT NULL,
        `direction` varchar(50) NOT NULL,
        `status` enum('started','success','error','warning') NOT NULL,
        `message` text DEFAULT NULL,
        `request_data` longtext DEFAULT NULL COMMENT 'JSON request data',
        `response_data` longtext DEFAULT NULL COMMENT 'JSON response data',
        `execution_time` decimal(10,4) DEFAULT NULL COMMENT 'Execution time in seconds',
        `memory_usage` int(11) DEFAULT NULL COMMENT 'Memory usage in bytes',
        `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
        `created_by` int(11) DEFAULT NULL,
        PRIMARY KEY (`id`),
        KEY `idx_queue_id` (`queue_id`),
        KEY `idx_entity_type_id` (`entity_type`, `entity_id`),
        KEY `idx_status` (`status`),
        KEY `idx_created_at` (`created_at`),
        CONSTRAINT `fk_sync_logs_queue` FOREIGN KEY (`queue_id`) REFERENCES `" . db_prefix() . "deskmoloni_sync_queue` (`id`) ON DELETE SET NULL
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;";
    
    $CI->db->query($sql);
}

/**
 * Create entity mappings table
 */
function desk_moloni_create_entity_mappings_table()
{
    $CI = &get_instance();
    
    $sql = "CREATE TABLE IF NOT EXISTS `" . db_prefix() . "desk_moloni_entity_mappings` (
        `id` int(11) NOT NULL AUTO_INCREMENT,
        `entity_type` varchar(50) NOT NULL,
        `perfex_id` int(11) NOT NULL,
        `moloni_id` int(11) NOT NULL,
        `perfex_hash` varchar(64) DEFAULT NULL COMMENT 'Hash of Perfex entity data',
        `moloni_hash` varchar(64) DEFAULT NULL COMMENT 'Hash of Moloni entity data',
        `sync_status` enum('synced','pending','error','conflict') NOT NULL DEFAULT 'synced',
        `last_sync_at` timestamp NULL DEFAULT NULL,
        `last_perfex_update` timestamp NULL DEFAULT NULL,
        `last_moloni_update` timestamp NULL DEFAULT NULL,
        `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
        `updated_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
        `metadata` json DEFAULT NULL COMMENT 'Additional mapping metadata',
        PRIMARY KEY (`id`),
        UNIQUE KEY `uk_entity_perfex` (`entity_type`, `perfex_id`),
        UNIQUE KEY `uk_entity_moloni` (`entity_type`, `moloni_id`),
        KEY `idx_sync_status` (`sync_status`),
        KEY `idx_last_sync` (`last_sync_at`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;";
    
    $CI->db->query($sql);
}

/**
 * Create sync rules table
 */
function desk_moloni_create_sync_rules_table()
{
    $CI = &get_instance();
    
    $sql = "CREATE TABLE IF NOT EXISTS `" . db_prefix() . "desk_moloni_sync_rules` (
        `id` int(11) NOT NULL AUTO_INCREMENT,
        `name` varchar(100) NOT NULL,
        `entity_type` varchar(50) NOT NULL,
        `rule_type` enum('field_mapping','validation','transformation','filter') NOT NULL,
        `conditions` json DEFAULT NULL COMMENT 'Rule conditions',
        `actions` json DEFAULT NULL COMMENT 'Rule actions',
        `priority` int(11) NOT NULL DEFAULT 0,
        `active` tinyint(1) NOT NULL DEFAULT 1,
        `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
        `updated_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
        `created_by` int(11) DEFAULT NULL,
        PRIMARY KEY (`id`),
        KEY `idx_entity_type` (`entity_type`),
        KEY `idx_rule_type` (`rule_type`),
        KEY `idx_active_priority` (`active`, `priority`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;";
    
    $CI->db->query($sql);
}

/**
 * Create webhook logs table
 */
function desk_moloni_create_webhook_logs_table()
{
    $CI = &get_instance();
    
    $sql = "CREATE TABLE IF NOT EXISTS `" . db_prefix() . "desk_moloni_webhook_logs` (
        `id` int(11) NOT NULL AUTO_INCREMENT,
        `webhook_id` varchar(100) DEFAULT NULL,
        `event_type` varchar(50) NOT NULL,
        `source` enum('moloni','perfex') NOT NULL,
        `payload` longtext DEFAULT NULL COMMENT 'JSON webhook payload',
        `headers` json DEFAULT NULL COMMENT 'Request headers',
        `signature` varchar(255) DEFAULT NULL,
        `signature_valid` tinyint(1) DEFAULT NULL,
        `processed` tinyint(1) NOT NULL DEFAULT 0,
        `processing_result` text DEFAULT NULL,
        `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
        `processed_at` timestamp NULL DEFAULT NULL,
        `ip_address` varchar(45) DEFAULT NULL,
        `user_agent` text DEFAULT NULL,
        PRIMARY KEY (`id`),
        KEY `idx_event_type` (`event_type`),
        KEY `idx_source` (`source`),
        KEY `idx_processed` (`processed`),
        KEY `idx_created_at` (`created_at`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;";
    
    $CI->db->query($sql);
}

/**
 * Create performance metrics table
 */
function desk_moloni_create_performance_metrics_table()
{
    $CI = &get_instance();
    
    $sql = "CREATE TABLE IF NOT EXISTS `" . db_prefix() . "desk_moloni_performance_metrics` (
        `id` int(11) NOT NULL AUTO_INCREMENT,
        `metric_type` varchar(50) NOT NULL,
        `metric_name` varchar(100) NOT NULL,
        `metric_value` decimal(15,4) NOT NULL,
        `metric_unit` varchar(20) DEFAULT NULL,
        `entity_type` varchar(50) DEFAULT NULL,
        `entity_id` int(11) DEFAULT NULL,
        `tags` json DEFAULT NULL COMMENT 'Additional metric tags',
        `recorded_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
        `date_hour` varchar(13) NOT NULL COMMENT 'YYYY-MM-DD HH for aggregation',
        `date_day` date NOT NULL COMMENT 'Date for daily aggregation',
        PRIMARY KEY (`id`),
        KEY `idx_metric_type_name` (`metric_type`, `metric_name`),
        KEY `idx_recorded_at` (`recorded_at`),
        KEY `idx_date_hour` (`date_hour`),
        KEY `idx_date_day` (`date_day`),
        KEY `idx_entity` (`entity_type`, `entity_id`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;";
    
    $CI->db->query($sql);
}

/**
 * Create error logs table
 */
function desk_moloni_create_error_logs_table()
{
    $CI = &get_instance();
    
    $sql = "CREATE TABLE IF NOT EXISTS `" . db_prefix() . "desk_moloni_error_logs` (
        `id` int(11) NOT NULL AUTO_INCREMENT,
        `error_code` varchar(50) DEFAULT NULL,
        `error_type` varchar(50) NOT NULL,
        `severity` enum('low','medium','high','critical') NOT NULL DEFAULT 'medium',
        `message` text NOT NULL,
        `context` json DEFAULT NULL COMMENT 'Error context data',
        `stack_trace` longtext DEFAULT NULL,
        `entity_type` varchar(50) DEFAULT NULL,
        `entity_id` int(11) DEFAULT NULL,
        `queue_id` int(11) DEFAULT NULL,
        `resolved` tinyint(1) NOT NULL DEFAULT 0,
        `resolved_at` timestamp NULL DEFAULT NULL,
        `resolved_by` int(11) DEFAULT NULL,
        `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
        `ip_address` varchar(45) DEFAULT NULL,
        `user_agent` text DEFAULT NULL,
        `created_by` int(11) DEFAULT NULL,
        PRIMARY KEY (`id`),
        KEY `idx_error_type` (`error_type`),
        KEY `idx_severity` (`severity`),
        KEY `idx_resolved` (`resolved`),
        KEY `idx_created_at` (`created_at`),
        KEY `idx_entity` (`entity_type`, `entity_id`),
        KEY `idx_queue_id` (`queue_id`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;";
    
    $CI->db->query($sql);
}

/**
 * Create configuration table
 */
function desk_moloni_create_configuration_table()
{
    $CI = &get_instance();
    
    $sql = "CREATE TABLE IF NOT EXISTS `" . db_prefix() . "desk_moloni_configuration` (
        `id` int(11) NOT NULL AUTO_INCREMENT,
        `config_key` varchar(100) NOT NULL,
        `config_value` longtext DEFAULT NULL,
        `config_type` enum('string','integer','boolean','json','encrypted') NOT NULL DEFAULT 'string',
        `description` text DEFAULT NULL,
        `category` varchar(50) DEFAULT NULL,
        `is_system` tinyint(1) NOT NULL DEFAULT 0,
        `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
        `updated_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
        `updated_by` int(11) DEFAULT NULL,
        PRIMARY KEY (`id`),
        UNIQUE KEY `uk_config_key` (`config_key`),
        KEY `idx_category` (`category`),
        KEY `idx_is_system` (`is_system`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;";
    
    $CI->db->query($sql);
}

/**
 * Create API tokens table
 */
function desk_moloni_create_api_tokens_table()
{
    $CI = &get_instance();
    
    $sql = "CREATE TABLE IF NOT EXISTS `" . db_prefix() . "desk_moloni_api_tokens` (
        `id` int(11) NOT NULL AUTO_INCREMENT,
        `token_type` enum('access_token','refresh_token','webhook_token') NOT NULL,
        `token_value` text NOT NULL COMMENT 'Encrypted token value',
        `expires_at` timestamp NULL DEFAULT NULL,
        `company_id` int(11) DEFAULT NULL,
        `scopes` json DEFAULT NULL,
        `metadata` json DEFAULT NULL,
        `active` tinyint(1) NOT NULL DEFAULT 1,
        `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
        `updated_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
        `last_used_at` timestamp NULL DEFAULT NULL,
        PRIMARY KEY (`id`),
        KEY `idx_token_type` (`token_type`),
        KEY `idx_company_id` (`company_id`),
        KEY `idx_active` (`active`),
        KEY `idx_expires_at` (`expires_at`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;";
    
    $CI->db->query($sql);
}

/**
 * Create document cache table
 */
function desk_moloni_create_document_cache_table()
{
    $CI = &get_instance();
    
    $sql = "CREATE TABLE IF NOT EXISTS `" . db_prefix() . "desk_moloni_document_cache` (
        `id` int(11) NOT NULL AUTO_INCREMENT,
        `cache_key` varchar(255) NOT NULL,
        `entity_type` varchar(50) NOT NULL,
        `entity_id` int(11) NOT NULL,
        `document_type` varchar(50) DEFAULT NULL,
        `document_data` longtext DEFAULT NULL COMMENT 'Cached document data',
        `file_path` varchar(500) DEFAULT NULL,
        `file_size` int(11) DEFAULT NULL,
        `mime_type` varchar(100) DEFAULT NULL,
        `expires_at` timestamp NULL DEFAULT NULL,
        `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
        `accessed_at` timestamp NULL DEFAULT NULL,
        `access_count` int(11) NOT NULL DEFAULT 0,
        PRIMARY KEY (`id`),
        UNIQUE KEY `uk_cache_key` (`cache_key`),
        KEY `idx_entity` (`entity_type`, `entity_id`),
        KEY `idx_expires_at` (`expires_at`),
        KEY `idx_document_type` (`document_type`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;";
    
    $CI->db->query($sql);
}

/**
 * Insert default settings
 */
function desk_moloni_insert_default_settings()
{
    $default_options = [
        // API Configuration
        'desk_moloni_api_base_url' => 'https://api.moloni.pt/v1/',
        'desk_moloni_oauth_base_url' => 'https://www.moloni.pt/v1/',
        'desk_moloni_api_timeout' => '30',
        'desk_moloni_max_retries' => '3',
        
        // Sync Configuration
        'desk_moloni_auto_sync_enabled' => '1',
        'desk_moloni_realtime_sync_enabled' => '0',
        'desk_moloni_sync_delay' => '300',
        'desk_moloni_batch_sync_enabled' => '1',
        
        // Entity Sync Settings
        'desk_moloni_sync_customers' => '1',
        'desk_moloni_sync_invoices' => '1',
        'desk_moloni_sync_estimates' => '1',
        'desk_moloni_sync_credit_notes' => '1',
        'desk_moloni_sync_receipts' => '0',
        'desk_moloni_sync_products' => '0',
        
        // Performance Settings
        'desk_moloni_enable_monitoring' => '1',
        'desk_moloni_enable_performance_tracking' => '1',
        'desk_moloni_enable_caching' => '1',
        'desk_moloni_cache_ttl' => '3600',
        
        // Security Settings
        'desk_moloni_enable_encryption' => '1',
        'desk_moloni_webhook_signature_verification' => '1',
        'desk_moloni_enable_audit_logging' => '1',
        
        // Logging Settings
        'desk_moloni_enable_logging' => '1',
        'desk_moloni_log_level' => 'info',
        'desk_moloni_log_api_requests' => '0',
        'desk_moloni_log_retention_days' => '30',
        
        // Queue Settings
        'desk_moloni_enable_queue' => '1',
        'desk_moloni_queue_batch_size' => '10',
        'desk_moloni_queue_max_attempts' => '3',
        'desk_moloni_queue_retry_delay' => '300',
        
        // Webhook Settings
        'desk_moloni_enable_webhooks' => '1',
        'desk_moloni_webhook_timeout' => '30',
        'desk_moloni_webhook_max_retries' => '3',
        
        // Client Portal Settings
        'desk_moloni_enable_client_portal' => '0',
        'desk_moloni_client_can_download_pdfs' => '1',
        
        // Error Handling
        'desk_moloni_continue_on_error' => '1',
        'desk_moloni_max_consecutive_errors' => '5',
        'desk_moloni_enable_error_notifications' => '1',
        
        // Cleanup Settings
        'desk_moloni_enable_cleanup' => '1',
        'desk_moloni_cleanup_interval' => '24',
        'desk_moloni_temp_file_retention' => '1',
        
        // Rate Limiting
        'desk_moloni_enable_rate_limiting' => '1',
        'desk_moloni_requests_per_minute' => '60',
        'desk_moloni_rate_limit_window' => '60',
        
        // Redis Settings
        'desk_moloni_enable_redis' => '0',
        'desk_moloni_redis_host' => '127.0.0.1',
        'desk_moloni_redis_port' => '6379',
        'desk_moloni_redis_database' => '0',
        
        // Module Metadata
        'desk_moloni_module_version' => (defined('DESK_MOLONI_MODULE_VERSION') ? DESK_MOLONI_MODULE_VERSION : (defined('DESK_MOLONI_VERSION') ? DESK_MOLONI_VERSION : '3.0.1')),
        'desk_moloni_installation_date' => date('Y-m-d H:i:s'),
        'desk_moloni_last_update' => date('Y-m-d H:i:s')
    ];

    foreach ($default_options as $name => $value) {
        // Only add if doesn't exist
        if (!get_option($name)) {
            update_option($name, $value);
        }
    }
}

/**
 * Create default sync configurations
 */
function desk_moloni_create_default_sync_configs()
{
    $CI = &get_instance();
    
    // Default field mapping rules
    $field_mapping_rules = [
        [
            'name' => 'Customer Basic Fields',
            'entity_type' => 'customer',
            'rule_type' => 'field_mapping',
            'conditions' => json_encode(['always' => true]),
            'actions' => json_encode([
                'perfex_to_moloni' => [
                    'company' => 'name',
                    'vat' => 'vat',
                    'billing_street' => 'address',
                    'billing_city' => 'city',
                    'billing_zip' => 'zip_code',
                    'email' => 'email',
                    'phonenumber' => 'phone'
                ],
                'moloni_to_perfex' => [
                    'name' => 'company',
                    'vat' => 'vat',
                    'address' => 'billing_street',
                    'city' => 'billing_city',
                    'zip_code' => 'billing_zip',
                    'email' => 'email',
                    'phone' => 'phonenumber'
                ]
            ]),
            'priority' => 10,
            'active' => 1
        ],
        [
            'name' => 'Invoice Basic Fields',
            'entity_type' => 'invoice',
            'rule_type' => 'field_mapping',
            'conditions' => json_encode(['always' => true]),
            'actions' => json_encode([
                'perfex_to_moloni' => [
                    'number' => 'number',
                    'date' => 'date',
                    'duedate' => 'due_date',
                    'subtotal' => 'net_value',
                    'total' => 'gross_value'
                ],
                'moloni_to_perfex' => [
                    'number' => 'number',
                    'date' => 'date',
                    'due_date' => 'duedate',
                    'net_value' => 'subtotal',
                    'gross_value' => 'total'
                ]
            ]),
            'priority' => 10,
            'active' => 1
        ]
    ];

    foreach ($field_mapping_rules as $rule) {
        $CI->db->insert(db_prefix() . 'desk_moloni_sync_rules', $rule);
    }
}

/**
 * Insert default configuration values
 */
function desk_moloni_insert_default_configurations()
{
    $CI = &get_instance();
    
    $default_configs = [
        [
            'config_key' => 'api_configuration',
            'config_value' => json_encode([
                'base_url' => 'https://api.moloni.pt/v1/',
                'oauth_url' => 'https://www.moloni.pt/v1/',
                'timeout' => 30,
                'max_retries' => 3,
                'user_agent' => 'Desk-Moloni-Integration/3.0.0'
            ]),
            'config_type' => 'json',
            'description' => 'API connection configuration',
            'category' => 'api',
            'is_system' => 1
        ],
        [
            'config_key' => 'sync_configuration',
            'config_value' => json_encode([
                'auto_sync' => true,
                'realtime_sync' => false,
                'batch_size' => 10,
                'default_delay' => 300,
                'max_attempts' => 3
            ]),
            'config_type' => 'json',
            'description' => 'Synchronization behavior configuration',
            'category' => 'sync',
            'is_system' => 0
        ],
        [
            'config_key' => 'performance_configuration',
            'config_value' => json_encode([
                'monitoring_enabled' => true,
                'caching_enabled' => true,
                'cache_ttl' => 3600,
                'log_slow_queries' => true,
                'slow_query_threshold' => 1000
            ]),
            'config_type' => 'json',
            'description' => 'Performance and monitoring settings',
            'category' => 'performance',
            'is_system' => 0
        ]
    ];

    foreach ($default_configs as $config) {
        // Check if configuration already exists
        $existing = $CI->db->get_where(db_prefix() . 'desk_moloni_configuration', 
            ['config_key' => $config['config_key']])->row();
        
        if (!$existing) {
            $CI->db->insert(db_prefix() . 'desk_moloni_configuration', $config);
        }
    }
}

/**
 * Create desk_moloni_config table (for existing model compatibility)
 */
function desk_moloni_create_config_table()
{
    $CI = &get_instance();
    
    $sql = "CREATE TABLE IF NOT EXISTS `" . db_prefix() . "deskmoloni_config` (
        `id` int(11) NOT NULL AUTO_INCREMENT,
        `setting_key` varchar(255) NOT NULL,
        `setting_value` longtext DEFAULT NULL,
        `encrypted` tinyint(1) NOT NULL DEFAULT 0,
        `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
        `updated_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
        PRIMARY KEY (`id`),
        UNIQUE KEY `uk_setting_key` (`setting_key`),
        KEY `idx_setting_key` (`setting_key`),
        KEY `idx_encrypted` (`encrypted`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;";
    
    $CI->db->query($sql);
}

/**
 * Create desk_moloni_mapping table (for existing model compatibility)
 */
function desk_moloni_create_mapping_table()
{
    $CI = &get_instance();
    
    $sql = "CREATE TABLE IF NOT EXISTS `" . db_prefix() . "deskmoloni_mapping` (
        `id` int(11) NOT NULL AUTO_INCREMENT,
        `entity_type` enum('client','product','invoice','estimate','credit_note') NOT NULL,
        `perfex_id` int(11) NOT NULL,
        `moloni_id` int(11) NOT NULL,
        `sync_direction` enum('perfex_to_moloni','moloni_to_perfex','bidirectional') NOT NULL DEFAULT 'bidirectional',
        `last_sync_at` timestamp NULL DEFAULT NULL,
        `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
        `updated_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
        PRIMARY KEY (`id`),
        UNIQUE KEY `unique_perfex_mapping` (`entity_type`, `perfex_id`),
        UNIQUE KEY `unique_moloni_mapping` (`entity_type`, `moloni_id`),
        KEY `idx_entity_perfex` (`entity_type`, `perfex_id`),
        KEY `idx_entity_moloni` (`entity_type`, `moloni_id`),
        KEY `idx_last_sync` (`last_sync_at`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;";
    
    $CI->db->query($sql);
}

/**
 * Create desk_moloni_sync_log table (for existing model compatibility)
 */
function desk_moloni_create_sync_log_table()
{
    $CI = &get_instance();
    
    $sql = "CREATE TABLE IF NOT EXISTS `" . db_prefix() . "deskmoloni_sync_log` (
        `id` int(11) NOT NULL AUTO_INCREMENT,
        `operation_type` enum('create','update','delete','status_change') NOT NULL,
        `entity_type` enum('client','product','invoice','estimate','credit_note') NOT NULL,
        `perfex_id` int(11) DEFAULT NULL,
        `moloni_id` int(11) DEFAULT NULL,
        `direction` enum('perfex_to_moloni','moloni_to_perfex') NOT NULL,
        `status` enum('success','error','warning') NOT NULL,
        `request_data` longtext DEFAULT NULL COMMENT 'JSON request data',
        `response_data` longtext DEFAULT NULL COMMENT 'JSON response data',
        `error_message` text DEFAULT NULL,
        `execution_time_ms` int(11) DEFAULT NULL COMMENT 'Execution time in milliseconds',
        `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
        PRIMARY KEY (`id`),
        KEY `idx_entity_status` (`entity_type`, `status`),
        KEY `idx_perfex_entity` (`perfex_id`, `entity_type`),
        KEY `idx_moloni_entity` (`moloni_id`, `entity_type`),
        KEY `idx_created_at` (`created_at`),
        KEY `idx_status_direction` (`status`, `direction`),
        KEY `idx_log_analytics` (`entity_type`, `operation_type`, `status`, `created_at`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;";
    
    $CI->db->query($sql);
}