<?php

declare(strict_types=1);

namespace App\Models;

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

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

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

    public static function findOrCreateByName(string $name, ?string $mattermostUsername = null): int
    {
        $db = Database::getConnection();
        $name = trim($name);

        $stmt = $db->prepare("SELECT id FROM employees WHERE LOWER(name) = LOWER(?)");
        $stmt->execute([$name]);
        $id = $stmt->fetchColumn();

        if ($id) {
            return (int)$id;
        }

        $stmt = $db->prepare("INSERT INTO employees (name, mattermost_username) VALUES (?, ?)");
        $stmt->execute([$name, $mattermostUsername ?: strtolower(preg_replace('/[^a-zA-Z0-9]/', '', $name))]);
        return (int)$db->lastInsertId();
    }
}