<?php

namespace App\Modules\User;

/**
 * User Model
 * User management model
 */
class Model
{
    private \PDO $pdo;

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

    /**
     * Get database connection
     */
    private function getConnection(): \PDO
    {
        $config = include __DIR__ . '/../../Config/database.php';
        $connection = $config['connections'][$config['default']];

        $dsn = "mysql:host={$connection['host']};port={$connection['port']};dbname={$connection['database']};charset={$connection['charset']}";

        return new \PDO($dsn, $connection['username'], $connection['password'], $connection['options']);
    }

    /**
     * Find user by ID
     */
    public function findById(int $id): ?array
    {
        $stmt = $this->pdo->prepare("SELECT * FROM users WHERE id = ?");
        $stmt->execute([$id]);

        $user = $stmt->fetch();
        return $user ?: null;
    }

    /**
     * Find user by email
     */
    public function findByEmail(string $email): ?array
    {
        $stmt = $this->pdo->prepare("SELECT * FROM users WHERE email = ?");
        $stmt->execute([$email]);

        $user = $stmt->fetch();
        return $user ?: null;
    }

    /**
     * Get all users
     */
    public function all(): array
    {
        $stmt = $this->pdo->query("SELECT id, name, email, created_at, updated_at FROM users ORDER BY created_at DESC");
        return $stmt->fetchAll();
    }

    /**
     * Create new user
     */
    public function create(array $data): int
    {
        $stmt = $this->pdo->prepare("
            INSERT INTO users (name, email, password, created_at, updated_at) 
            VALUES (?, ?, ?, NOW(), NOW())
        ");

        $stmt->execute([
            $data['name'],
            $data['email'],
            password_hash($data['password'], PASSWORD_ARGON2ID)
        ]);

        return $this->pdo->lastInsertId();
    }

    /**
     * Update user
     */
    public function update(int $id, array $data): bool
    {
        $fields = [];
        $values = [];

        foreach ($data as $key => $value) {
            if ($key !== 'id') {
                $fields[] = "{$key} = ?";
                $values[] = $value;
            }
        }

        if (empty($fields)) {
            return false;
        }

        $values[] = $id;
        $sql = "UPDATE users SET " . implode(', ', $fields) . ", updated_at = NOW() WHERE id = ?";

        $stmt = $this->pdo->prepare($sql);
        return $stmt->execute($values);
    }

    /**
     * Delete user
     */
    public function delete(int $id): bool
    {
        $stmt = $this->pdo->prepare("DELETE FROM users WHERE id = ?");
        return $stmt->execute([$id]);
    }

    /**
     * Check if email exists
     */
    public function emailExists(string $email, ?int $excludeId = null): bool
    {
        $sql = "SELECT COUNT(*) FROM users WHERE email = ?";
        $params = [$email];

        if ($excludeId) {
            $sql .= " AND id != ?";
            $params[] = $excludeId;
        }

        $stmt = $this->pdo->prepare($sql);
        $stmt->execute($params);

        return $stmt->fetchColumn() > 0;
    }

    /**
     * Get users with pagination
     */
    public function paginate(int $page = 1, int $perPage = 10): array
    {
        $offset = ($page - 1) * $perPage;

        $stmt = $this->pdo->prepare("
            SELECT id, name, email, created_at, updated_at 
            FROM users 
            ORDER BY created_at DESC 
            LIMIT ? OFFSET ?
        ");

        $stmt->execute([$perPage, $offset]);
        $users = $stmt->fetchAll();

        // Get total count
        $countStmt = $this->pdo->query("SELECT COUNT(*) FROM users");
        $total = $countStmt->fetchColumn();

        return [
            'data' => $users,
            'total' => $total,
            'per_page' => $perPage,
            'current_page' => $page,
            'last_page' => ceil($total / $perPage)
        ];
    }

    /**
     * Search users
     */
    public function search(string $query): array
    {
        $stmt = $this->pdo->prepare("
            SELECT id, name, email, created_at, updated_at 
            FROM users 
            WHERE name LIKE ? OR email LIKE ? 
            ORDER BY created_at DESC
        ");

        $searchTerm = "%{$query}%";
        $stmt->execute([$searchTerm, $searchTerm]);

        return $stmt->fetchAll();
    }
}