<?php

declare(strict_types=1);

namespace App\Models;

use App\Core\Database\Database;
use PDO;

class User
{
    public static function all(): array
    {
        $db = Database::getConnection();
        $stmt = $db->query("
            SELECT u.id, u.name, u.username, u.email, u.created_at,
                   (SELECT COUNT(*) FROM employee_orders WHERE user_id = u.id) as total_orders,
                   (SELECT COALESCE(SUM(total_bill), 0) FROM employee_orders WHERE user_id = u.id AND status = 'unpaid') as unpaid_balance
            FROM users u
            ORDER BY u.name ASC
        ");
        return $stmt->fetchAll();
    }

    public static function find(int $id): ?array
    {
        $db = Database::getConnection();
        $stmt = $db->prepare("SELECT id, name, username, email, created_at FROM users WHERE id = ?");
        $stmt->execute([$id]);
        $res = $stmt->fetch();
        return $res ?: null;
    }

    public static function findByIdentifier(string $identifier): ?array
    {
        $db = Database::getConnection();
        $identifier = trim($identifier);
        $stmt = $db->prepare("SELECT * FROM users WHERE LOWER(username) = LOWER(?) OR LOWER(email) = LOWER(?)");
        $stmt->execute([$identifier, $identifier]);
        $res = $stmt->fetch();
        return $res ?: null;
    }

    public static function create(string $name, string $username, string $email, string $password): int
    {
        $db = Database::getConnection();
        $hash = password_hash($password, PASSWORD_DEFAULT);

        $stmt = $db->prepare("INSERT INTO users (name, username, email, password_hash) VALUES (?, ?, ?, ?)");
        $stmt->execute([
            trim($name),
            strtolower(trim($username)),
            strtolower(trim($email)),
            $hash
        ]);

        return (int)$db->lastInsertId();
    }
}