<?php
/**
 * Fired during plugin activation
 */
class TWP_Activator {
    
    /**
     * Run activation tasks
     */
    public static function activate() {
        // Create database tables
        self::create_tables();
        
        // Set default options
        self::set_default_options();
        
        // Create custom user roles
        self::create_user_roles();
        
        // Set the database version
        if (defined('TWP_DB_VERSION')) {
            update_option('twp_db_version', TWP_DB_VERSION);
        }
        
        // Create webhook endpoints
        flush_rewrite_rules();
    }
    
    /**
     * Check if tables exist and create them if needed
     */
    public static function ensure_tables_exist() {
        global $wpdb;
        
        $required_tables = array(
            'twp_phone_schedules',
            'twp_call_queues',
            'twp_queued_calls',
            'twp_workflows',
            'twp_call_log',
            'twp_sms_log',
            'twp_voicemails',
            'twp_agent_groups',
            'twp_group_members',
            'twp_agent_status',
            'twp_callbacks'
        );
        
        $missing_tables = array();
        
        foreach ($required_tables as $table) {
            $table_name = $wpdb->prefix . $table;
            $table_exists = $wpdb->get_var($wpdb->prepare("SHOW TABLES LIKE %s", $table_name));
            
            if (!$table_exists) {
                $missing_tables[] = $table;
            }
        }
        
        if (!empty($missing_tables)) {
            error_log('TWP Plugin: Missing database tables: ' . implode(', ', $missing_tables) . '. Creating them now.');
            self::create_tables();
            return false; // Tables were missing
        }
        
        // Check for and perform any needed migrations
        self::migrate_tables();
        
        return true; // All tables exist
    }
    
    /**
     * Create plugin database tables
     */
    private static function create_tables() {
        global $wpdb;
        
        $charset_collate = $wpdb->get_charset_collate();
        
        // Phone schedules table
        $table_schedules = $wpdb->prefix . 'twp_phone_schedules';
        $sql_schedules = "CREATE TABLE $table_schedules (
            id int(11) NOT NULL AUTO_INCREMENT,
            phone_number varchar(20),
            schedule_name varchar(100) NOT NULL,
            days_of_week varchar(100) NOT NULL,
            start_time time NOT NULL,
            end_time time NOT NULL,
            workflow_id varchar(100),
            forward_number varchar(20),
            after_hours_action varchar(20) DEFAULT 'workflow',
            after_hours_workflow_id varchar(100),
            after_hours_forward_number varchar(20),
            holiday_dates text,
            is_active tinyint(1) DEFAULT 1,
            created_at datetime DEFAULT CURRENT_TIMESTAMP,
            updated_at datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
            PRIMARY KEY (id),
            KEY phone_number (phone_number)
        ) $charset_collate;";
        
        // Call queues table
        $table_queues = $wpdb->prefix . 'twp_call_queues';
        $sql_queues = "CREATE TABLE $table_queues (
            id int(11) NOT NULL AUTO_INCREMENT,
            queue_name varchar(100) NOT NULL,
            notification_number varchar(20),
            agent_group_id int(11),
            max_size int(11) DEFAULT 10,
            wait_music_url varchar(255),
            tts_message text,
            timeout_seconds int(11) DEFAULT 300,
            created_at datetime DEFAULT CURRENT_TIMESTAMP,
            PRIMARY KEY (id),
            KEY agent_group_id (agent_group_id),
            KEY notification_number (notification_number)
        ) $charset_collate;";
        
        // Queued calls table
        $table_queued_calls = $wpdb->prefix . 'twp_queued_calls';
        $sql_queued_calls = "CREATE TABLE $table_queued_calls (
            id int(11) NOT NULL AUTO_INCREMENT,
            queue_id int(11) NOT NULL,
            call_sid varchar(100) NOT NULL,
            from_number varchar(20) NOT NULL,
            to_number varchar(20) NOT NULL,
            position int(11) NOT NULL,
            status varchar(20) DEFAULT 'waiting',
            agent_phone varchar(20),
            agent_call_sid varchar(100),
            joined_at datetime DEFAULT CURRENT_TIMESTAMP,
            answered_at datetime,
            ended_at datetime,
            PRIMARY KEY (id),
            KEY queue_id (queue_id),
            KEY call_sid (call_sid),
            KEY status (status)
        ) $charset_collate;";
        
        // Workflows table
        $table_workflows = $wpdb->prefix . 'twp_workflows';
        $sql_workflows = "CREATE TABLE $table_workflows (
            id int(11) NOT NULL AUTO_INCREMENT,
            workflow_name varchar(100) NOT NULL,
            phone_number varchar(20) NOT NULL,
            workflow_data longtext,
            is_active tinyint(1) DEFAULT 1,
            created_at datetime DEFAULT CURRENT_TIMESTAMP,
            updated_at datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
            PRIMARY KEY (id),
            KEY phone_number (phone_number)
        ) $charset_collate;";
        
        // Call log table
        $table_call_log = $wpdb->prefix . 'twp_call_log';
        $sql_call_log = "CREATE TABLE $table_call_log (
            id int(11) NOT NULL AUTO_INCREMENT,
            call_sid varchar(100) NOT NULL,
            from_number varchar(20),
            to_number varchar(20),
            status varchar(20) NOT NULL,
            duration int(11) DEFAULT 0,
            workflow_id int(11),
            workflow_name varchar(100),
            queue_time int(11) DEFAULT 0,
            actions_taken text,
            call_data longtext,
            created_at datetime DEFAULT CURRENT_TIMESTAMP,
            updated_at datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
            PRIMARY KEY (id),
            KEY call_sid (call_sid),
            KEY from_number (from_number),
            KEY status (status)
        ) $charset_collate;";
        
        // SMS log table
        $table_sms_log = $wpdb->prefix . 'twp_sms_log';
        $sql_sms_log = "CREATE TABLE $table_sms_log (
            id int(11) NOT NULL AUTO_INCREMENT,
            message_sid varchar(100) NOT NULL,
            from_number varchar(20) NOT NULL,
            to_number varchar(20) NOT NULL,
            body text,
            received_at datetime DEFAULT CURRENT_TIMESTAMP,
            PRIMARY KEY (id),
            KEY message_sid (message_sid)
        ) $charset_collate;";
        
        // Voicemails table
        $table_voicemails = $wpdb->prefix . 'twp_voicemails';
        $sql_voicemails = "CREATE TABLE $table_voicemails (
            id int(11) NOT NULL AUTO_INCREMENT,
            workflow_id int(11),
            from_number varchar(20) NOT NULL,
            recording_url varchar(255),
            duration int(11) DEFAULT 0,
            transcription text,
            created_at datetime DEFAULT CURRENT_TIMESTAMP,
            PRIMARY KEY (id),
            KEY workflow_id (workflow_id)
        ) $charset_collate;";
        
        // Agent groups table
        $table_agent_groups = $wpdb->prefix . 'twp_agent_groups';
        $sql_agent_groups = "CREATE TABLE $table_agent_groups (
            id int(11) NOT NULL AUTO_INCREMENT,
            group_name varchar(100) NOT NULL,
            description text,
            ring_strategy varchar(20) DEFAULT 'simultaneous',
            timeout_seconds int(11) DEFAULT 30,
            created_at datetime DEFAULT CURRENT_TIMESTAMP,
            updated_at datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
            PRIMARY KEY (id),
            UNIQUE KEY group_name (group_name)
        ) $charset_collate;";
        
        // Group members table
        $table_group_members = $wpdb->prefix . 'twp_group_members';
        $sql_group_members = "CREATE TABLE $table_group_members (
            id int(11) NOT NULL AUTO_INCREMENT,
            group_id int(11) NOT NULL,
            user_id bigint(20) NOT NULL,
            priority int(11) DEFAULT 0,
            is_active tinyint(1) DEFAULT 1,
            added_at datetime DEFAULT CURRENT_TIMESTAMP,
            PRIMARY KEY (id),
            KEY group_id (group_id),
            KEY user_id (user_id),
            UNIQUE KEY group_user (group_id, user_id)
        ) $charset_collate;";
        
        // Agent status table
        $table_agent_status = $wpdb->prefix . 'twp_agent_status';
        $sql_agent_status = "CREATE TABLE $table_agent_status (
            id int(11) NOT NULL AUTO_INCREMENT,
            user_id bigint(20) NOT NULL,
            status varchar(20) DEFAULT 'offline',
            current_call_sid varchar(100),
            last_activity datetime DEFAULT CURRENT_TIMESTAMP,
            available_for_queues tinyint(1) DEFAULT 1,
            PRIMARY KEY (id),
            UNIQUE KEY user_id (user_id)
        ) $charset_collate;";
        
        require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
        dbDelta($sql_schedules);
        dbDelta($sql_queues);
        dbDelta($sql_queued_calls);
        dbDelta($sql_workflows);
        dbDelta($sql_call_log);
        dbDelta($sql_sms_log);
        dbDelta($sql_voicemails);
        // Callbacks table
        $table_callbacks = $wpdb->prefix . 'twp_callbacks';
        $sql_callbacks = "CREATE TABLE $table_callbacks (
            id int(11) NOT NULL AUTO_INCREMENT,
            phone_number varchar(20) NOT NULL,
            requested_at datetime DEFAULT CURRENT_TIMESTAMP,
            status varchar(20) DEFAULT 'pending',
            attempts int(11) DEFAULT 0,
            last_attempt datetime,
            completed_at datetime,
            queue_id int(11),
            original_call_sid varchar(100),
            callback_call_sid varchar(100),
            notes text,
            PRIMARY KEY (id),
            KEY phone_number (phone_number),
            KEY status (status),
            KEY queue_id (queue_id)
        ) $charset_collate;";
        
        dbDelta($sql_schedules);
        dbDelta($sql_queues);
        dbDelta($sql_queued_calls);
        dbDelta($sql_workflows);
        dbDelta($sql_call_log);
        dbDelta($sql_sms_log);
        dbDelta($sql_voicemails);
        dbDelta($sql_agent_groups);
        dbDelta($sql_group_members);
        dbDelta($sql_agent_status);
        dbDelta($sql_callbacks);
        
        // Add missing columns for existing installations
        self::add_missing_columns();
    }
    
    /**
     * Add missing columns for existing installations
     */
    private static function add_missing_columns() {
        global $wpdb;
        
        $table_schedules = $wpdb->prefix . 'twp_phone_schedules';
        
        // Check if holiday_dates column exists
        $column_exists = $wpdb->get_results("SHOW COLUMNS FROM $table_schedules LIKE 'holiday_dates'");
        
        if (empty($column_exists)) {
            $wpdb->query("ALTER TABLE $table_schedules ADD COLUMN holiday_dates text AFTER after_hours_forward_number");
        }
        
        // Check if days_of_week column needs to be expanded
        $column_info = $wpdb->get_results("SHOW COLUMNS FROM $table_schedules LIKE 'days_of_week'");
        if (!empty($column_info) && $column_info[0]->Type === 'varchar(20)') {
            $wpdb->query("ALTER TABLE $table_schedules MODIFY COLUMN days_of_week varchar(100) NOT NULL");
        }
        
        // Add new columns to call queues table and migrate phone_number to notification_number
        $table_queues = $wpdb->prefix . 'twp_call_queues';
        
        // Check if phone_number column exists and notification_number doesn't - need migration
        $phone_column_exists = $wpdb->get_results("SHOW COLUMNS FROM $table_queues LIKE 'phone_number'");
        $notification_column_exists = $wpdb->get_results("SHOW COLUMNS FROM $table_queues LIKE 'notification_number'");
        
        if (!empty($phone_column_exists) && empty($notification_column_exists)) {
            // Migrate phone_number to notification_number
            $wpdb->query("ALTER TABLE $table_queues CHANGE phone_number notification_number varchar(20)");
            // Update the index name
            $wpdb->query("ALTER TABLE $table_queues DROP INDEX phone_number");
            $wpdb->query("ALTER TABLE $table_queues ADD INDEX notification_number (notification_number)");
        } elseif (empty($phone_column_exists) && empty($notification_column_exists)) {
            // Fresh installation - add notification_number column
            $wpdb->query("ALTER TABLE $table_queues ADD COLUMN notification_number varchar(20) AFTER queue_name");
            $wpdb->query("ALTER TABLE $table_queues ADD INDEX notification_number (notification_number)");
        }
        
        // Check if agent_group_id column exists in queues table
        $group_column_exists = $wpdb->get_results("SHOW COLUMNS FROM $table_queues LIKE 'agent_group_id'");
        if (empty($group_column_exists)) {
            $wpdb->query("ALTER TABLE $table_queues ADD COLUMN agent_group_id int(11) AFTER notification_number");
            $wpdb->query("ALTER TABLE $table_queues ADD INDEX agent_group_id (agent_group_id)");
        }
        
        // Add agent columns to queued_calls table if they don't exist
        $table_queued_calls = $wpdb->prefix . 'twp_queued_calls';
        
        $agent_phone_exists = $wpdb->get_results("SHOW COLUMNS FROM $table_queued_calls LIKE 'agent_phone'");
        if (empty($agent_phone_exists)) {
            $wpdb->query("ALTER TABLE $table_queued_calls ADD COLUMN agent_phone varchar(20) AFTER status");
        }
        
        $agent_call_sid_exists = $wpdb->get_results("SHOW COLUMNS FROM $table_queued_calls LIKE 'agent_call_sid'");
        if (empty($agent_call_sid_exists)) {
            $wpdb->query("ALTER TABLE $table_queued_calls ADD COLUMN agent_call_sid varchar(100) AFTER agent_phone");
        }
        
        // Add status index if it doesn't exist
        $status_index_exists = $wpdb->get_results("SHOW INDEX FROM $table_queued_calls WHERE Key_name = 'status'");
        if (empty($status_index_exists)) {
            $wpdb->query("ALTER TABLE $table_queued_calls ADD INDEX status (status)");
        }
    }
    
    /**
     * Perform table migrations for existing installations
     */
    private static function migrate_tables() {
        // Call the existing add_missing_columns function which now includes queue columns
        self::add_missing_columns();
    }
    
    /**
     * Set default plugin options
     */
    private static function set_default_options() {
        add_option('twp_twilio_account_sid', '');
        add_option('twp_twilio_auth_token', '');
        add_option('twp_elevenlabs_api_key', '');
        add_option('twp_elevenlabs_voice_id', '');
        add_option('twp_elevenlabs_model_id', 'eleven_multilingual_v2');
        add_option('twp_default_queue_timeout', 300);
        add_option('twp_default_queue_size', 10);
        add_option('twp_urgent_keywords', 'urgent,emergency,important,asap,help');
        add_option('twp_sms_notification_number', '');
        add_option('twp_default_sms_number', '');
    }
    
    /**
     * Create custom user roles for the plugin
     */
    private static function create_user_roles() {
        // Remove role first if it exists to ensure clean setup
        remove_role('phone_agent');
        
        // Add Phone Agent role with limited capabilities
        add_role('phone_agent', 'Phone Agent', array(
            // Basic WordPress capabilities
            'read' => true,
            
            // Profile management
            'edit_profile' => true,
            
            // Phone agent specific capabilities
            'twp_access_voicemails' => true,
            'twp_access_call_log' => true,
            'twp_access_agent_queue' => true,
            'twp_access_outbound_calls' => true,
            'twp_access_sms_inbox' => true,
            'twp_access_browser_phone' => true,
        ));
    }
}