<?php

declare(strict_types=1);

namespace Domovoy\Repositories;

use PDO;
use Domovoy\Models\User;

class UserRepository
{
    private PDO $pdo;

    public function __construct(PDO $pdo)
    {
        $this->pdo = $pdo;
    }

    public function findById(string $id): ?User
    {
        $stmt = $this->pdo->prepare('SELECT * FROM users WHERE id = :id');
        $stmt->execute(['id' => $id]);
        $row = $stmt->fetch();
        return $row ? User::fromArray($row) : null;
    }

    public function findByUsername(string $username): ?User
    {
        $stmt = $this->pdo->prepare('SELECT * FROM users WHERE username = :username');
        $stmt->execute(['username' => $username]);
        $row = $stmt->fetch();
        return $row ? User::fromArray($row) : null;
    }

    public function findAll(): array
    {
        $stmt = $this->pdo->query('SELECT * FROM users ORDER BY created_at DESC');
        $users = [];
        while ($row = $stmt->fetch()) {
            $users[] = User::fromArray($row);
        }
        return $users;
    }

    public function count(): int
    {
        $stmt = $this->pdo->query('SELECT COUNT(*) FROM users');
        return (int) $stmt->fetchColumn();
    }

    public function save(User $user): void
    {
        if ($user->id === null) {
            $user->id = \Ramsey\Uuid\Uuid::uuid4()->toString();
        }

        $now = (new \DateTimeImmutable())->format('Y-m-d H:i:s');
        $user->updatedAt = new \DateTimeImmutable($now);
        if ($user->createdAt === null) {
            $user->createdAt = new \DateTimeImmutable($now);
        }

        $stmt = $this->pdo->prepare(
            'INSERT INTO users (id, username, password_hash, created_at, updated_at)
             VALUES (:id, :username, :password_hash, :created_at, :updated_at)'
        );
        $stmt->execute([
            'id' => $user->id,
            'username' => $user->username,
            'password_hash' => $user->passwordHash,
            'created_at' => $user->createdAt->format('Y-m-d H:i:s'),
            'updated_at' => $user->updatedAt->format('Y-m-d H:i:s'),
        ]);
    }
}