<?php

namespace App\Models;

use Core\Model;

class User extends Model
{
    protected static string $table = 'users';

    /**
     * Find user by username
     */
    public function findByUsername(string $username): ?array
    {
        $stmt = $this->db->prepare("SELECT * FROM users WHERE username = ? AND is_active = 1");
        $stmt->execute([$username]);
        $result = $stmt->fetch();
        return $result ?: null;
    }

    /**
     * Verify password
     */
    public function verifyPassword(string $password, string $hash): bool
    {
        return password_verify($password, $hash);
    }

    /**
     * Update last login timestamp
     */
    public function updateLastLogin(int $userId): bool
    {
        $stmt = $this->db->prepare("UPDATE users SET last_login = NOW() WHERE id = ?");
        return $stmt->execute([$userId]);
    }

    /**
     * Create user with hashed password
     */
    public function createUser(string $username, string $password, ?string $email = null, ?string $fullName = null): int
    {
        $hashedPassword = password_hash($password, PASSWORD_DEFAULT);
        
        return $this->create([
            'username' => $username,
            'password' => $hashedPassword,
            'email' => $email,
            'full_name' => $fullName,
            'is_active' => 1
        ]);
    }

    /**
     * Change password
     */
    public function changePassword(int $userId, string $newPassword): bool
    {
        $hashedPassword = password_hash($newPassword, PASSWORD_DEFAULT);
        $stmt = $this->db->prepare("UPDATE users SET password = ? WHERE id = ?");
        return $stmt->execute([$hashedPassword, $userId]);
    }
    
    /**
     * Get users with filters, sorting, and pagination
     */
    public function getFiltered(array $filters = [], string $sort = 'username', string $order = 'ASC', int $limit = 25, int $offset = 0): array
    {
        $query = "SELECT * FROM users WHERE 1=1";
        $params = [];
        
        // Apply search filter
        if (!empty($filters['search'])) {
            $query .= " AND (username LIKE ? OR email LIKE ? OR full_name LIKE ?)";
            $searchTerm = "%{$filters['search']}%";
            $params[] = $searchTerm;
            $params[] = $searchTerm;
            $params[] = $searchTerm;
        }
        
        // Apply role filter
        if (!empty($filters['role'])) {
            $query .= " AND role = ?";
            $params[] = $filters['role'];
        }
        
        // Apply status filter
        if (isset($filters['status']) && $filters['status'] !== '') {
            $isActive = ($filters['status'] === 'active') ? 1 : 0;
            $query .= " AND is_active = ?";
            $params[] = $isActive;
        }
        
        // Apply sorting
        $allowedSortColumns = ['username', 'email', 'full_name', 'role', 'is_active', 'email_verified', 'last_login', 'created_at'];
        if (!in_array($sort, $allowedSortColumns)) {
            $sort = 'username';
        }
        $order = strtoupper($order) === 'DESC' ? 'DESC' : 'ASC';
        $query .= " ORDER BY {$sort} {$order}";
        
        // Apply pagination
        $query .= " LIMIT ? OFFSET ?";
        $params[] = $limit;
        $params[] = $offset;
        
        $stmt = $this->db->prepare($query);
        $stmt->execute($params);
        return $stmt->fetchAll(\PDO::FETCH_ASSOC);
    }
    
    /**
     * Count users with filters
     */
    public function countFiltered(array $filters = []): int
    {
        $query = "SELECT COUNT(*) as total FROM users WHERE 1=1";
        $params = [];
        
        // Apply search filter
        if (!empty($filters['search'])) {
            $query .= " AND (username LIKE ? OR email LIKE ? OR full_name LIKE ?)";
            $searchTerm = "%{$filters['search']}%";
            $params[] = $searchTerm;
            $params[] = $searchTerm;
            $params[] = $searchTerm;
        }
        
        // Apply role filter
        if (!empty($filters['role'])) {
            $query .= " AND role = ?";
            $params[] = $filters['role'];
        }
        
        // Apply status filter
        if (isset($filters['status']) && $filters['status'] !== '') {
            $isActive = ($filters['status'] === 'active') ? 1 : 0;
            $query .= " AND is_active = ?";
            $params[] = $isActive;
        }
        
        $stmt = $this->db->prepare($query);
        $stmt->execute($params);
        return (int)$stmt->fetch(\PDO::FETCH_ASSOC)['total'];
    }
}