<?php

declare(strict_types=1);

namespace App\Controllers;

use App\Core\Controller;
use App\Core\Http\Request;
use App\Core\Http\Response;
use App\Models\Order;
use App\Models\Product;
use App\Models\Customer;

class OrderController extends Controller
{
    public function index(Request $request, Response $response): string
    {
        $status = $request->get('status', 'all');
        $search = $request->get('search');

        $orders = Order::all($status, $search);

        return $this->render('orders/index', [
            'title' => 'Order Management',
            'orders' => $orders,
            'currentStatus' => $status,
            'search' => $search,
        ]);
    }

    public function create(Request $request, Response $response): string
    {
        $customers = Customer::all();
        $products = Product::all();

        return $this->render('orders/create', [
            'title' => 'Create New Order',
            'customers' => $customers,
            'products' => $products,
        ]);
    }

    public function store(Request $request, Response $response): Response
    {
        $customerId = (int)$request->post('customer_id');
        $status = $request->post('status', 'Pending');
        $tax = (float)$request->post('tax', 0.00);
        $discount = (float)$request->post('discount', 0.00);
        $notes = trim((string)$request->post('notes', ''));
        $rawItems = $request->post('items', []);

        if ($customerId <= 0) {
            return $this->redirect('/orders/create', null, 'Please select a customer.');
        }

        if (empty($rawItems) || !is_array($rawItems)) {
            return $this->redirect('/orders/create', null, 'Please add at least one product item.');
        }

        $subtotal = 0.0;
        $itemsToSave = [];

        foreach ($rawItems as $item) {
            $productId = (int)($item['product_id'] ?? 0);
            $qty = (int)($item['quantity'] ?? 0);
            
            if ($productId <= 0 || $qty <= 0) {
                continue;
            }

            $product = Product::find($productId);
            if (!$product) {
                continue;
            }

            $unitPrice = (float)$product['price'];
            $lineTotal = $unitPrice * $qty;
            $subtotal += $lineTotal;

            $itemsToSave[] = [
                'product_id' => $productId,
                'product_name' => $product['name'],
                'quantity' => $qty,
                'unit_price' => $unitPrice,
                'total_price' => $lineTotal,
            ];
        }

        if (empty($itemsToSave)) {
            return $this->redirect('/orders/create', null, 'Please select valid products with quantities greater than 0.');
        }

        $total = max(0, $subtotal + $tax - $discount);

        try {
            $orderId = Order::createOrderWithItems([
                'customer_id' => $customerId,
                'status' => $status,
                'subtotal' => $subtotal,
                'tax' => $tax,
                'discount' => $discount,
                'total' => $total,
                'notes' => $notes,
            ], $itemsToSave);

            return $this->redirect("/orders/{$orderId}", 'Order created successfully!');
        } catch (\Throwable $e) {
            return $this->redirect('/orders/create', null, 'Failed to create order: ' . $e->getMessage());
        }
    }

    public function show(Request $request, Response $response, array $params): string|Response
    {
        $id = (int)($params['id'] ?? 0);
        $order = Order::find($id);

        if (!$order) {
            return $this->redirect('/orders', null, 'Order not found.');
        }

        return $this->render('orders/show', [
            'title' => "Order #{$order['order_number']}",
            'order' => $order,
        ]);
    }

    public function updateStatus(Request $request, Response $response, array $params): Response
    {
        $id = (int)($params['id'] ?? 0);
        $status = $request->post('status');

        $validStatuses = ['Pending', 'Processing', 'Completed', 'Cancelled'];
        if (in_array($status, $validStatuses, true)) {
            Order::updateStatus($id, $status);
            return $this->redirect("/orders/{$id}", "Order status updated to '{$status}'.");
        }

        return $this->redirect("/orders/{$id}", null, 'Invalid order status.');
    }

    public function delete(Request $request, Response $response, array $params): Response
    {
        $id = (int)($params['id'] ?? 0);
        Order::delete($id);
        return $this->redirect('/orders', 'Order deleted successfully.');
    }
}