<?php
/**
 * Phone schedule management class
 */
class TWP_Scheduler {
    
    /**
     * Check active schedules
     */
    public function check_active_schedules() {
        global $wpdb;
        $table_name = $wpdb->prefix . 'twp_phone_schedules';
        
        // Use WordPress timezone
        $wp_timezone = wp_timezone();
        $current_datetime = new DateTime('now', $wp_timezone);
        
        $current_time = $current_datetime->format('H:i:s');
        $current_day = strtolower($current_datetime->format('l'));
        
        $schedules = $wpdb->get_results($wpdb->prepare(
            "SELECT * FROM $table_name 
             WHERE is_active = 1 
             AND days_of_week LIKE %s
             AND start_time <= %s 
             AND end_time >= %s",
            '%' . $current_day . '%',
            $current_time,
            $current_time
        ));
        
        foreach ($schedules as $schedule) {
            $this->apply_schedule($schedule);
        }
    }
    
    /**
     * Apply schedule to phone number
     */
    private function apply_schedule($schedule) {
        $twilio = new TWP_Twilio_API();
        
        // Get phone numbers
        $numbers = $twilio->get_phone_numbers();
        
        if ($numbers['success']) {
            foreach ($numbers['data']['incoming_phone_numbers'] as $number) {
                if ($number['phone_number'] == $schedule->phone_number) {
                    // Configure webhook based on schedule
                    $webhook_url = home_url('/wp-json/twilio-webhook/v1/voice');
                    $webhook_url = add_query_arg('schedule_id', $schedule->id, $webhook_url);
                    
                    $twilio->configure_phone_number(
                        $number['sid'],
                        $webhook_url
                    );
                    
                    break;
                }
            }
        }
    }
    
    /**
     * Create schedule
     */
    public static function create_schedule($data) {
        global $wpdb;
        $table_name = $wpdb->prefix . 'twp_phone_schedules';
        
        // Debug logging - ensure tables exist and columns are correct
        TWP_Activator::ensure_tables_exist();
        
        // Force column update check
        global $wpdb;
        $table_schedules = $wpdb->prefix . 'twp_phone_schedules';
        $column_info = $wpdb->get_results("SHOW COLUMNS FROM $table_schedules LIKE 'days_of_week'");
        if (!empty($column_info)) {
            error_log('TWP Create Schedule: Current days_of_week column type: ' . $column_info[0]->Type);
            if ($column_info[0]->Type === 'varchar(20)') {
                error_log('TWP Create Schedule: Expanding days_of_week column to varchar(100)');
                $wpdb->query("ALTER TABLE $table_schedules MODIFY COLUMN days_of_week varchar(100) NOT NULL");
            }
        }
        
        error_log('TWP Create Schedule: Input data: ' . print_r($data, true));
        error_log('TWP Create Schedule: Table name: ' . $table_name);
        
        $insert_data = array(
            'schedule_name' => sanitize_text_field($data['schedule_name']),
            'days_of_week' => sanitize_text_field($data['days_of_week']),
            'start_time' => sanitize_text_field($data['start_time']),
            'end_time' => sanitize_text_field($data['end_time']),
            'is_active' => isset($data['is_active']) ? 1 : 0
        );
        
        $format = array('%s', '%s', '%s', '%s', '%d');
        
        // Add workflow_id if provided
        if ($data['workflow_id']) {
            $insert_data['workflow_id'] = sanitize_text_field($data['workflow_id']);
            $format[] = '%s';
        }
        
        // Add optional fields if provided
        if (!empty($data['phone_number'])) {
            $insert_data['phone_number'] = sanitize_text_field($data['phone_number']);
            $format[] = '%s';
        }
        
        if (!empty($data['forward_number'])) {
            $insert_data['forward_number'] = sanitize_text_field($data['forward_number']);
            $format[] = '%s';
        }
        
        if (!empty($data['after_hours_action'])) {
            $insert_data['after_hours_action'] = sanitize_text_field($data['after_hours_action']);
            $format[] = '%s';
        }
        
        if (!empty($data['after_hours_workflow_id'])) {
            $insert_data['after_hours_workflow_id'] = sanitize_text_field($data['after_hours_workflow_id']);
            $format[] = '%s';
        }
        
        if (!empty($data['after_hours_forward_number'])) {
            $insert_data['after_hours_forward_number'] = sanitize_text_field($data['after_hours_forward_number']);
            $format[] = '%s';
        }
        
        if (isset($data['holiday_dates'])) {
            $insert_data['holiday_dates'] = sanitize_textarea_field($data['holiday_dates']);
            $format[] = '%s';
        }
        
        error_log('TWP Create Schedule: Insert data: ' . print_r($insert_data, true));
        error_log('TWP Create Schedule: Insert format: ' . print_r($format, true));
        
        $result = $wpdb->insert($table_name, $insert_data, $format);
        
        error_log('TWP Create Schedule: Insert result: ' . ($result ? 'true' : 'false'));
        if ($result === false) {
            error_log('TWP Create Schedule: Database error: ' . $wpdb->last_error);
        } else {
            $new_id = $wpdb->insert_id;
            error_log('TWP Create Schedule: New schedule ID: ' . $new_id);
        }
        
        return $result !== false;
    }
    
    /**
     * Update schedule
     */
    public static function update_schedule($id, $data) {
        global $wpdb;
        $table_name = $wpdb->prefix . 'twp_phone_schedules';
        
        $update_data = array();
        $update_format = array();
        
        if (isset($data['phone_number'])) {
            $update_data['phone_number'] = sanitize_text_field($data['phone_number']);
            $update_format[] = '%s';
        }
        
        if (isset($data['schedule_name'])) {
            $update_data['schedule_name'] = sanitize_text_field($data['schedule_name']);
            $update_format[] = '%s';
        }
        
        if (isset($data['days_of_week'])) {
            $update_data['days_of_week'] = sanitize_text_field($data['days_of_week']);
            $update_format[] = '%s';
        }
        
        if (isset($data['start_time'])) {
            $update_data['start_time'] = sanitize_text_field($data['start_time']);
            $update_format[] = '%s';
        }
        
        if (isset($data['end_time'])) {
            $update_data['end_time'] = sanitize_text_field($data['end_time']);
            $update_format[] = '%s';
        }
        
        if (isset($data['workflow_id'])) {
            $update_data['workflow_id'] = sanitize_text_field($data['workflow_id']);
            $update_format[] = '%s';
        }
        
        if (isset($data['forward_number'])) {
            $update_data['forward_number'] = sanitize_text_field($data['forward_number']);
            $update_format[] = '%s';
        }
        
        if (isset($data['after_hours_action'])) {
            $update_data['after_hours_action'] = sanitize_text_field($data['after_hours_action']);
            $update_format[] = '%s';
        }
        
        if (isset($data['after_hours_workflow_id'])) {
            $update_data['after_hours_workflow_id'] = sanitize_text_field($data['after_hours_workflow_id']);
            $update_format[] = '%s';
        }
        
        if (isset($data['after_hours_forward_number'])) {
            $update_data['after_hours_forward_number'] = sanitize_text_field($data['after_hours_forward_number']);
            $update_format[] = '%s';
        }
        
        if (isset($data['holiday_dates'])) {
            $update_data['holiday_dates'] = sanitize_textarea_field($data['holiday_dates']);
            $update_format[] = '%s';
        }
        
        if (isset($data['is_active'])) {
            $update_data['is_active'] = $data['is_active'] ? 1 : 0;
            $update_format[] = '%d';
        }
        
        $result = $wpdb->update(
            $table_name,
            $update_data,
            array('id' => $id),
            $update_format,
            array('%d')
        );
        
        return $result !== false;
    }
    
    /**
     * Delete schedule
     */
    public static function delete_schedule($id) {
        global $wpdb;
        $table_name = $wpdb->prefix . 'twp_phone_schedules';
        
        return $wpdb->delete(
            $table_name,
            array('id' => $id),
            array('%d')
        );
    }
    
    /**
     * Get schedules
     */
    public static function get_schedules($phone_number = null) {
        global $wpdb;
        $table_name = $wpdb->prefix . 'twp_phone_schedules';
        
        if ($phone_number) {
            return $wpdb->get_results($wpdb->prepare(
                "SELECT * FROM $table_name WHERE phone_number = %s ORDER BY created_at DESC",
                $phone_number
            ));
        } else {
            return $wpdb->get_results("SELECT * FROM $table_name ORDER BY created_at DESC");
        }
    }
    
    /**
     * Get schedule by ID
     */
    public static function get_schedule($id) {
        global $wpdb;
        $table_name = $wpdb->prefix . 'twp_phone_schedules';
        
        return $wpdb->get_row($wpdb->prepare(
            "SELECT * FROM $table_name WHERE id = %d",
            $id
        ));
    }
    
    /**
     * Check if schedule is active now
     */
    public static function is_schedule_active($schedule_id) {
        $schedule = self::get_schedule($schedule_id);
        
        if (!$schedule || !$schedule->is_active) {
            error_log('TWP Schedule: Schedule not found or inactive - ID: ' . $schedule_id);
            return false;
        }
        
        // Use WordPress timezone for all date/time operations
        $wp_timezone = wp_timezone();
        $current_datetime = new DateTime('now', $wp_timezone);
        
        $current_time = $current_datetime->format('H:i:s');
        $current_day = strtolower($current_datetime->format('l')); // Monday, Tuesday, etc.
        $current_date = $current_datetime->format('Y-m-d');
        
        error_log('TWP Schedule: Checking schedule "' . $schedule->schedule_name . '" - Current time: ' . $current_time . ', Current day: ' . $current_day . ', WP Timezone: ' . $wp_timezone->getName());
        error_log('TWP Schedule: Schedule days: ' . $schedule->days_of_week . ', Schedule time: ' . $schedule->start_time . ' - ' . $schedule->end_time);
        
        // Check if today is a holiday
        if (self::is_holiday($schedule, $current_date)) {
            error_log('TWP Schedule: Today is a holiday - treating as after-hours');
            return false; // Treat holidays as after-hours
        }
        
        // Check if current day is in schedule
        if (strpos($schedule->days_of_week, $current_day) === false) {
            error_log('TWP Schedule: Current day (' . $current_day . ') not in schedule days (' . $schedule->days_of_week . ')');
            return false;
        }
        
        // Check if current time is within schedule
        $is_within_hours = $current_time >= $schedule->start_time && $current_time <= $schedule->end_time;
        error_log('TWP Schedule: Time check - Current: ' . $current_time . ', Start: ' . $schedule->start_time . ', End: ' . $schedule->end_time . ', Within hours: ' . ($is_within_hours ? 'YES' : 'NO'));
        
        return $is_within_hours;
    }
    
    /**
     * Check if today is a holiday for this schedule
     */
    private static function is_holiday($schedule, $current_date = null) {
        if (empty($schedule->holiday_dates)) {
            return false;
        }
        
        if ($current_date === null) {
            // Use WordPress timezone
            $wp_timezone = wp_timezone();
            $current_datetime = new DateTime('now', $wp_timezone);
            $current_date = $current_datetime->format('Y-m-d');
        }
        
        $holidays = array_map('trim', explode(',', $schedule->holiday_dates));
        
        return in_array($current_date, $holidays);
    }
    
    /**
     * Get appropriate routing for schedule
     */
    public static function get_schedule_routing($schedule_id) {
        $schedule = self::get_schedule($schedule_id);
        
        if (!$schedule || !$schedule->is_active) {
            return array(
                'action' => 'default',
                'data' => null
            );
        }
        
        $is_within_hours = self::is_schedule_active($schedule_id);
        
        if ($is_within_hours) {
            // Within business hours - use main workflow
            return array(
                'action' => 'workflow',
                'data' => array(
                    'workflow_id' => $schedule->workflow_id
                )
            );
        } else {
            // After hours - use after hours routing
            if ($schedule->after_hours_action === 'forward' && $schedule->after_hours_forward_number) {
                return array(
                    'action' => 'forward',
                    'data' => array(
                        'forward_number' => $schedule->after_hours_forward_number
                    )
                );
            } else if ($schedule->after_hours_action === 'workflow' && $schedule->after_hours_workflow_id) {
                return array(
                    'action' => 'workflow',
                    'data' => array(
                        'workflow_id' => $schedule->after_hours_workflow_id
                    )
                );
            } else {
                // Default to main workflow if no after hours action specified
                return array(
                    'action' => 'workflow',
                    'data' => array(
                        'workflow_id' => $schedule->workflow_id
                    )
                );
            }
        }
    }
}