<?php

namespace App\Models;

use Core\Model;

class NotificationGroup extends Model
{
    protected static string $table = 'notification_groups';

    /**
     * Get User model instance
     */
    private function getUserModel(): \App\Models\User
    {
        return new \App\Models\User();
    }

    /**
     * Get all groups with channel count
     */
    public function getAllWithChannelCount(?int $userId = null): array
    {
        $sql = "SELECT ng.*, 
                COUNT(DISTINCT nc.id) as channel_count,
                COUNT(DISTINCT d.id) as domain_count
                FROM notification_groups ng
                LEFT JOIN notification_channels nc ON ng.id = nc.notification_group_id
                LEFT JOIN domains d ON ng.id = d.notification_group_id";
        
        if ($userId) {
            $sql .= " WHERE ng.user_id = ? GROUP BY ng.id ORDER BY ng.name ASC";
            $stmt = $this->db->prepare($sql);
            $stmt->execute([$userId]);
        } else {
            $sql .= " GROUP BY ng.id ORDER BY ng.name ASC";
            $stmt = $this->db->query($sql);
        }
        
        return $stmt->fetchAll();
    }

    /**
     * Get group with channels and domains
     */
    public function getWithDetails(int $id, ?int $userId = null): ?array
    {
        $group = $this->find($id);

        if (!$group) {
            return null;
        }

        // Check if user has access to this group
        if ($userId && $group['user_id'] != $userId) {
            return null;
        }

        // Get channels
        $channelModel = new NotificationChannel();
        $group['channels'] = $channelModel->getByGroupId($id);

        // Get domains (filtered by user if needed)
        $domainModel = new Domain();
        if ($userId) {
            $sql = "SELECT * FROM domains WHERE notification_group_id = ? AND user_id = ?";
            $stmt = $this->db->prepare($sql);
            $stmt->execute([$id, $userId]);
            $group['domains'] = $stmt->fetchAll();
        } else {
            $group['domains'] = $domainModel->where('notification_group_id', $id);
        }

        return $group;
    }

    /**
     * Delete group and handle relationships
     */
    public function deleteWithRelations(int $id): bool
    {
        // The database CASCADE will handle channels
        // But we need to set domains to NULL
        $sql = "UPDATE domains SET notification_group_id = NULL WHERE notification_group_id = ?";
        $stmt = $this->db->prepare($sql);
        $stmt->execute([$id]);

        return $this->delete($id);
    }


    /**
     * Assign all notification groups without user_id to a specific user
     */
    public function assignUnassignedGroupsToUser(int $userId): int
    {
        $stmt = $this->db->prepare("UPDATE notification_groups SET user_id = ? WHERE user_id IS NULL");
        $stmt->execute([$userId]);
        return $stmt->rowCount();
    }
}