<?php

declare(strict_types=1);

namespace App\Models;

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

class Product
{
    public static function all(): array
    {
        $db = Database::getConnection();
        $stmt = $db->query("SELECT * FROM products ORDER BY name ASC");
        return $stmt->fetchAll();
    }

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

    public static function count(): int
    {
        $db = Database::getConnection();
        return (int)$db->query("SELECT COUNT(*) FROM products")->fetchColumn();
    }

    public static function lowStockCount(int $threshold = 25): int
    {
        $db = Database::getConnection();
        $stmt = $db->prepare("SELECT COUNT(*) FROM products WHERE stock <= ?");
        $stmt->execute([$threshold]);
        return (int)$stmt->fetchColumn();
    }

    public static function create(array $data): int
    {
        $db = Database::getConnection();
        $stmt = $db->prepare("
            INSERT INTO products (sku, name, description, price, stock, category) 
            VALUES (:sku, :name, :description, :price, :stock, :category)
        ");
        $stmt->execute([
            ':sku' => $data['sku'],
            ':name' => $data['name'],
            ':description' => $data['description'] ?? '',
            ':price' => $data['price'],
            ':stock' => (int)($data['stock'] ?? 0),
            ':category' => $data['category'] ?? 'General',
        ]);
        return (int)$db->lastInsertId();
    }

    public static function update(int $id, array $data): bool
    {
        $db = Database::getConnection();
        $stmt = $db->prepare("
            UPDATE products 
            SET sku = :sku, name = :name, description = :description, 
                price = :price, stock = :stock, category = :category
            WHERE id = :id
        ");
        return $stmt->execute([
            ':id' => $id,
            ':sku' => $data['sku'],
            ':name' => $data['name'],
            ':description' => $data['description'] ?? '',
            ':price' => $data['price'],
            ':stock' => (int)($data['stock'] ?? 0),
            ':category' => $data['category'] ?? 'General',
        ]);
    }

    public static function deductStock(int $id, int $quantity): bool
    {
        $db = Database::getConnection();
        $stmt = $db->prepare("UPDATE products SET stock = MAX(0, stock - ?) WHERE id = ?");
        return $stmt->execute([$quantity, $id]);
    }
}