<?php

namespace App\Http\Controllers\frontend;

use App\Http\Controllers\Controller;
use App\Http\Helpers\Helper;
use App\Http\Services\Cart;
use App\Models\Addon;
use App\Models\Cart as CartModel;
use App\Models\Discount;
use App\Models\Hosting;
use App\Models\Invoice;
use App\Models\InvoiceItem;
use App\Models\ModuleHosting;
use App\Models\ModuleVmware;
use App\Models\Order;
use App\Models\Os;
use App\Models\VPS;
use Exception;
use Illuminate\Http\Request;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Validator;

class CartController extends Controller
{
    public function index(Cart $cart)
    {
        $cartItems = $cart->cart(customer()?->id);
        $title = "Giỏ hàng";

        return view("frontend.cart.index", compact('cartItems', 'title'));
    }

    public function addCart(Request $request)
    {
        $userId = customer()?->id;
        $months = $request->input('months');
        $productId = $request->product_id;
        $typeId = $request->type_id;

        if (!$userId) {
            return back()->with('error', 'Bạn cần đăng nhập để thêm sản phẩm vào giỏ hàng.');
        }

        // Validate input data
        if (!$productId || !$typeId || !$months) {
            return back()->with('error', 'Dữ liệu không hợp lệ.');
        }

        // Use updateOrCreate instead of delete + create for better performance
        try {
            CartModel::updateOrCreate(
                ['customer_id' => $userId], // Only one cart item per user
                [
                    'product_id' => $productId,
                    'type_product' => $typeId,
                    'months' => $months,
                ]
            );

            return redirect()->route('cart.index')->with('success', 'Sản phẩm đã được thêm vào giỏ hàng!');
        } catch (\Exception $e) {
            Log::error('Cart add error: ' . $e->getMessage(), [
                'user_id' => $userId,
                'product_id' => $productId,
                'type_id' => $typeId
            ]);
            return back()->with('error', 'Có lỗi xảy ra khi thêm sản phẩm vào giỏ hàng.');
        }
    }

    public function store(Request $request, Cart $cart)
    {
        $validator = null;
        $allOrderItem = [];
        if ($request->vps) {
            $validator = Validator::make(
                $request->all(),
                [
                    'vps.*.os_id' => 'required',
                    'vps.*.os_version_id' => 'required',
                    'vps.*.time_buy' => 'required',
                    'vps.*.hostname' => 'required'
                ],
                [
                    'vps.*.os_id' => [
                        'required' => 'Vui lòng chọn hệ điều hành cần cài đặt!'
                    ],
                    'vps.*.os_version_id' => [
                        'required' => 'Vui lòng chọn version cần cài đặt!'
                    ],
                    'vps.*.hostname' => [
                        'required' => 'Vui lòng nhập hostname!'
                    ]
                ]
            );

            foreach ($request->vps as $_key => $_item) {
                $product = $cart->getItem(customer()?->id, $_key);
                if ($product) {
                    $allOrderItem[] = [
                        'data' => $_item,
                        'product' => $product
                    ];
                }
            }
        }
        if ($request->hosting) {
            $validator = Validator::make(
                $request->all(),
                [
                    'hosting.*.time_buy' => 'required',
                    'hosting.*.domain' => 'required'
                ],
                [
                    'hosting.*.domain' => [
                        'required' => 'Vui lòng nhập tên miền để kích hoạt Hosting!'
                    ],
                    'hosting.*.time_buy' => [
                        'required' => 'Vui lòng chọn thời gian thanh toán!'
                    ],
                ]
            );
            $regexFilterDomain = '/(?:[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?\.)+[a-z0-9][a-z0-9-]{0,61}[a-z0-9]/m';

            foreach ($request->hosting as $_key => $_item) {
                $filter = filter_var(
                    $request->hosting[$_key]['domain'],
                    FILTER_VALIDATE_REGEXP,
                    [
                        'options' => [
                            'regexp' => $regexFilterDomain
                        ]
                    ]
                );

                if ($filter === false) {
                    return back()->with($request->except(['_token']))->withErrors("Tên miền không hợp lệ");
                }
            }
            foreach ($request->hosting as $_key => $_item) {
                $product = $cart->getItem(customer()?->id, $_key);
                if ($product) {
                    $allOrderItem[] = [
                        'data' => $_item,
                        'product' => $product
                    ];
                }
            }
        }

        if ($validator && $validator->fails()) {
            return back()->with($request->except(['_token']))->withErrors($validator);
        }


        if (!count($allOrderItem)) {
            return back()->with($request->except('_token'))->withErrors("Yêu cầu không hợp lệ");
        }

        $relid_data = [];

        foreach ($allOrderItem as $key => $item) {
            $relid_code = Helper::generateUniqueCode();
            $product = null;
            $relid_data[$key]['code'] = $relid_code;
            $relid_data[$key]['data'] = [
                'customer_id' => customer()?->id,
                'status' => 3
            ];

            switch ($item['product']['product_type']) {
                case 3:
                    $product = Hosting::find($item['product']['product']);
                    $relid_data[$key]['data']['name'] = $item['data']['domain'];
                    $relid_data[$key]['type'] = 3;
                    break;
                case 4:
                    $product = VPS::find($item['product']['product']);
                    $relid_data[$key]['data']['hostname'] = $item['data']['hostname'];
                    $relid_data[$key]['data']['os_id'] = $item['data']['os_version_id'];
                    $relid_data[$key]['type'] = 4;
                    break;
            }

            $subMessage = "";

            $billing = 0;

            switch ($item['data']['time_buy']) {
                case 1:
                    $billing = 2;
                    $subMessage = " ( " . Carbon::today()->format('d/m/Y') . " - " . Carbon::today()->addMonths(1)->format('d/m/Y') . " )";
                    $relid_data[$key]['data']['next_due_date'] = Carbon::today()->addMonths(1)->timestamp;
                    $relid_data[$key]['data']['next_invoice'] = Carbon::today()->addMonths(1)->timestamp;
                    break;
                case 3:
                    $billing = 3;
                    $subMessage = " ( " . Carbon::today()->format('d/m/Y') . " - " . Carbon::today()->addMonths(3)->format('d/m/Y') . " )";
                    $relid_data[$key]['data']['next_due_date'] = Carbon::today()->addMonths(3)->timestamp;
                    $relid_data[$key]['data']['next_invoice'] = Carbon::today()->addMonths(3)->timestamp;
                    break;
                case 6:
                    $billing = 4;
                    $subMessage = " ( " . Carbon::today()->format('d/m/Y') . " - " . Carbon::today()->addMonths(6)->format('d/m/Y') . " )";
                    $relid_data[$key]['data']['next_due_date'] = Carbon::today()->addMonths(6)->timestamp;
                    $relid_data[$key]['data']['next_invoice'] = Carbon::today()->addMonths(6)->timestamp;
                    break;
                case 12:
                    $billing = 5;
                    $subMessage = " ( " . Carbon::today()->format('d/m/Y') . " - " . Carbon::today()->addMonths(12)->format('d/m/Y') . " )";
                    $relid_data[$key]['data']['next_due_date'] = Carbon::today()->addMonths(12)->timestamp;
                    $relid_data[$key]['data']['next_invoice'] = Carbon::today()->addMonths(12)->timestamp;
                    break;
            }
            $totalAddon = 0;

            $message = $product->name;


            $product_item[] = [
                'customer_id' => customer()?->id,
                'type_id' => $item['product']['product_type'],
                'product_id' => $item['product']['product'],
                'description' => $message . $subMessage,
                'amount' => $item['product']['price'] * $item['data']['time_buy'],
                'billing' => $billing,
                'invoice_type' => 1,
                'tax' => 1,
                'parent_id' => 0,
                'code' => $relid_code,
                'due_date' => Carbon::today()->hour(23)->minute(59)->second(59)->timestamp,
            ];

            if (isset($item['data']['addon'])) {
                foreach ($item['data']['addon'] as $_key => $_sub) {
                    $productAddon = Addon::where('name', 'like', "%$_key%")->first();
                    $message = "Addon " . $productAddon->name;
                    if ($_sub['value']) {
                        $totalAddon += $_sub['price'] * $_sub['value'] * $item['data']['time_buy'];
                        $product_item[$key]['addon'][] = [
                            'customer_id' => customer()?->id,
                            'type_id' => $productAddon->type_id,
                            'product_id' => $productAddon->id,
                            'description' => $message . $subMessage,
                            'amount' => $_sub['price'] * $_sub['value'] * $item['data']['time_buy'],
                            'billing' => $billing,
                            'invoice_type' => 1,
                            'tax' => 1,
                            'due_date' => Carbon::today()->hour(23)->minute(59)->second(59)->timestamp,
                        ];
                    }
                }
            }

            $relid_data[$key]['data']['first_payment'] = $item['product']['price'] * $item['data']['time_buy'] + $totalAddon;
            $relid_data[$key]['data']['next_payment'] = $item['product']['price'] * $item['data']['time_buy'] + $totalAddon;
        }

        $allOrderItemWithAddon = array_map(function ($item) {
            $codeCheckAddon = Helper::generateUniqueCode();
            $item['addon_code'] = $codeCheckAddon;
            return $item;
        }, $product_item);

        $addonArray = [];

        foreach ($allOrderItemWithAddon as $item) {
            if (isset($item['addon'])) {
                foreach ($item['addon'] as $_Sub) {
                    $_Sub['parent'] = $item['addon_code'];
                    $addonArray[] = $_Sub;
                }
            }
        }

        $allOrderItemWithAddon = array_map(function ($item) {
            if (isset($item['addon'])) {
                unset($item['addon']);
            }
            return $item;
        }, array_merge($addonArray, $allOrderItemWithAddon));

        $total = array_sum(array_map(function ($item) {
            return $item['amount'];
        }, $allOrderItemWithAddon));

        $discount = 0;

        $discount_value = 0;

        if (session('coupon')) {
            $discount = session('coupon')['coupon_id'];
            switch (session('coupon')['coupon_type']) {
                case 1:
                    $discount_value = (int) ((session('coupon')['coupon_value'] / 100) * $total);
                    $total -= $discount_value;
                    break;
                case 2:
                    $discount_value = (int) session('coupon')['coupon_value'];
                    $total -= $discount_value;
                    break;
            }
        }

        try {
            DB::beginTransaction();
            $invoice_data = [
                'date' => Carbon::today()->timestamp,
                'due_date' => Carbon::today()->hour(23)->minute(59)->second(59)->timestamp,
                'sub_total' => $total,
                'tax' => $total * (10 / 100),
                'total' => $total + ($total * (10 / 100)),
                'payment_id' => 1,
                'customer_id' => customer()?->id,
                'status' => 0
            ];
            $invoice_id = Invoice::insertGetId($invoice_data);

            $allOrderItemWithAddon = array_map(function ($array) use ($invoice_id) {
                $array['invoice_id'] = $invoice_id;
                return $array;
            }, $allOrderItemWithAddon);

            $order_item = [
                'order_num' => Helper::generateUniqueCode(),
                'customer_id' => customer()?->id,
                'date' => Carbon::today()->timestamp,
                'invoice_id' => $invoice_id,
                'discount_id' => $discount,
                'discount_value' => $discount_value,
                'amount' => $total + ($total * (10 / 100)),
                'payment_id' => 1,
                'user_id' => 0,
                'status' => 0,
                'client_ip' => $request->getClientIp()
            ];

            $order = Order::insertGetId($order_item);

            $relid_data = array_map(function ($array) use ($order) {
                $array['data']['order_id'] = $order;
                return $array;
            }, $relid_data);

            $relid = [];
            //insert + get id for item auto created by module
            foreach ($relid_data as $item) {
                $code = $item['code'];

                switch ($item['type']) {
                    case 3:
                        $relid_id = ModuleHosting::insertGetId($item['data']);
                        $relid[$code] = $relid_id;
                        break;
                    case 4:
                        $relid_id = ModuleVmware::insertGetId($item['data']);
                        $relid[$code] = $relid_id;
                        break;
                }

            }

            $allInvoiceItem = array_map(function ($array) use ($relid) {
                if (isset($array['code']) && array_key_exists($array['code'], $relid)) {
                    $array['relid'] = $relid[$array['code']];

                } else {
                    $array['relid'] = 0;
                }
                unset($array['code']);

                return $array;

            }, $allOrderItemWithAddon);

            $productNoAddon = array_values(array_filter($allInvoiceItem, function ($item) {
                if (isset($item['addon_code'])) {
                    return $item;
                }
            }));
            $productAddon = array_values(array_filter($allInvoiceItem, function ($item) {
                if (!isset($item['addon_code'])) {
                    return $item;
                }
            }));

            $allProduct = [];

            foreach ($productNoAddon as $item) {
                foreach ($productAddon as $_sub) {
                    if ($item['addon_code'] === $_sub['parent']) {
                        $_Sub['parent_id'] = $item['relid'];

                        $_sub['parent_id'] = $item['relid'];
                        unset($_sub['parent']);
                        $allProduct[] = $_sub;
                    }
                }
                if (isset($item['addon_code'])) {
                    unset($item['addon_code']);
                }
                $allProduct[] = $item;
            }

            InvoiceItem::insert($allProduct);

            $last_id = InvoiceItem::latest('id')->limit(count($allProduct))->select('id')->get()->toArray();

            $Order__order_item = array_map(function ($array) use ($order) {
                return [
                    'order_id' => $order,
                    'InvoiceItem_id' => $array['id']
                ];
            }, $last_id);

            DB::table('order__order_item')->insert($Order__order_item);


            Log::create([
                'agent' => $request->userAgent(),
                'client_ip' => $request->getClientIp(),
                'username' => "System",
                'description' => customer()?->firstname . " created new Order with Order id: " . $order,
                'customer_id' => customer()?->id
            ]);
            if (session('coupon')) {
                Discount::find(session('coupon')['coupon_id'])->increment('use', 1);
            }
            DB::commit();

        } catch (Exception $exception) {
            DB::rollBack();
            return back()->with($request->except(['_token']))->withErrors($exception->getMessage());
        }
        session()->forget('cart');
        session()->forget('coupon');
        return redirect()->route('invoice.show', ['invoice_id' => $invoice_id])->with('sucess', 'Đặt hàng thành công');
    }


    public function destroy(Request $request, Cart $cart)
    {
        $validator = Validator::make(
            $request->all(),
            [
                'cart_id' => 'required'
            ],
            [
                'cart_id' => [
                    'required' => 'Yêu cầu không hợp lệ'
                ]
            ]
        );
        if ($validator->fails()) {
            return back()->withErrors($validator);
        }

        $status = $cart->removeCartItem(customer()?->id, $request->cart_id);

        if ($status) {
            return back()->with('success', 'Xoá thông tin đơn hàng thành công');
        }
        return back()->withErrors('Yêu cầu không hợp lệ');
    }

    public function applyCoupon(Request $request)
    {
        $validator = Validator::make(
            $request->all(),
            [
                'promotion_code' => 'required'
            ],
            [
                'promotion_code' => [
                    'required' => 'Mã giảm giá không được để trống'
                ]
            ]
        );
        if ($validator->fails()) {
            return redirect()
                ->route('cart')
                ->with($request->except(['_token']))
                ->withErrors($validator);
        }
        $Coupon = Discount::where('code', $request->promotion_code)->first();
        if (!$Coupon) {
            return redirect()
                ->route('cart')
                ->with($request->except(['_token']))
                ->withErrors("Mã giảm giá không hợp lệ");
        }
        if ($Coupon->status === 0) {
            return redirect()
                ->route('cart')
                ->with($request->except(['_token']))
                ->withErrors("Mã giảm giá không hợp lệ");
        }
        if ($Coupon->end < Carbon::today()->timestamp) {
            return redirect()
                ->route('cart')
                ->with($request->except(['_token']))
                ->withErrors("Mã giảm giá đã hết hạn sử dụng");
        }
        if ($Coupon->start > Carbon::today()->timestamp) {
            return redirect()
                ->route('cart')
                ->with($request->except(['_token']))
                ->withErrors("Mã giảm giá không hợp lệ");
        }
        if ($Coupon->use === $Coupon->count) {
            return redirect()
                ->route('cart')
                ->with($request->except(['_token']))
                ->withErrors("Mã giảm giá đã đạt giới hạn số lượng cho phép");
        }
        $couponAdded = [
            'coupon_value' => $Coupon->discount,
            'coupon_type' => $Coupon->type,
            'coupon_code' => $Coupon->code,
            'coupon_id' => $Coupon->id
        ];
        session()->put('coupon', $couponAdded);
        return redirect()
            ->route('cart')
            ->with($request->except(['_token']))
            ->with('success', 'Áp dụng mã giảm thành công!');
    }

    public function addon(Request $request)
    {
        $validator = Validator::make($request->all(), [
            'product' => 'required|not__in:0'
        ], ['product.required' => 'Yêu cầu không hợp lệ']);

        if ($validator->fails()) {
            return response()->json(['error' => true, 'message' => $validator]);
        }

        $count = 0;
        $sumAddon = 0;
        $addOn = [];
        $billing = 0;
        if ($request->addon) {
            $i = 0;
            foreach ($request->addon as $key => $item) {
                if ($item['quantity'] != 0) {
                    $product = Addon::where('name', 'like', "%$key%")->first();
                    $addOn[$i] = [
                        'customer_id' => customer()?->id,
                        'type_id' => 1,
                        'due_date' => Carbon::today()->hour(23)->minute(59)->second(59)->timestamp,
                        'product_id' => $product->id,
                        'parent_id' => $request->product,
                        'relid' => 0,
                        'invoice_type' => "1",
                        'billing' => $request->billing,
                        'amount' => $item['price'] * $item['quantity'],
                        'tax' => 1,
                    ];
                    $message = "Addon " . strtoupper($key);
                    switch ($request->billing) {
                        case 2:
                            $billing = 1;
                            $message .= " ( " . Carbon::today()->format('d/m/Y') . " - " . Carbon::today()->addMonths(1)->format('d/m/Y') . " )";
                            break;
                        case 3:
                            $billing = 3;
                            $message .= " ( " . Carbon::today()->format('d/m/Y') . " - " . Carbon::today()->addMonths(3)->format('d/m/Y') . " )";
                            break;
                        case 4:
                            $billing = 6;
                            $message .= " ( " . Carbon::today()->format('d/m/Y') . " - " . Carbon::today()->addMonths(6)->format('d/m/Y') . " )";

                            break;
                        case 5:
                            $billing = 12;
                            $message .= " ( " . Carbon::today()->format('d/m/Y') . " - " . Carbon::today()->addMonths(12)->format('d/m/Y') . " )";
                            break;
                    }
                    $addOn[$i]['description'] = $message;
                }
                if ($item['quantity'] == 0) {
                    ++$count;
                }
                $sumAddon += $item['price'] * $item['quantity'];
                $i++;
            }
        }

        $sumAddon *= $billing;

        if ($count === 3) {
            return response()->json(['error' => true, 'message' => 'Vui lòng chọn một addon để nâng cấp cấu hình!']);
        }

        $product = ModuleVmware::with('Order')->find($request->product);

        if (!$product) {
            return response()->json(['error' => true, 'message' => 'Yêu cầu không hợp lệ']);
        }

        $invoice_data = [
            'date' => Carbon::today()->timestamp,
            'due_date' => Carbon::today()->hour(23)->minute(59)->second(59)->timestamp,
            'sub_total' => $sumAddon,
            'tax' => $sumAddon * (10 / 100),
            'total' => $sumAddon + ($sumAddon * (10 / 100)),
            'payment_id' => 1,
            'customer_id' => customer()?->id,
            'status' => 0
        ];

        try {
            DB::beginTransaction();
            $invoice = Invoice::insertGetId($invoice_data);


            $order = [
                'order_num' => Helper::generateUniqueCode(),
                    'customer_id' => customer()?->id,
                'date' => Carbon::today()->timestamp,
                'invoice_id' => $invoice,
                'discount_id' => 0,
                'discount_value' => 0,
                'amount' => $sumAddon + ($sumAddon * (10 / 100)),
                'payment_id' => 1,
                'user_id' => 0,
                'status' => 0,
                'client_ip' => $request->getClientIp()
            ];
            $order_id = Order::insertGetId($order);
            $AddonItem = array_map(function ($item) use ($invoice) {
                $item['invoice_id'] = $invoice;
                return $item;
            }, $addOn);

            InvoiceItem::insert($AddonItem);

            $Order_item = InvoiceItem::select('id')->latest('id')->limit(count($AddonItem))->get();

            foreach ($Order_item as $item) {
                DB::table('order__order_item')->insert([
                    'InvoiceItem_id' => $item->id,
                    'order_id' => $order_id
                ]);
            }
            DB::commit();
        } catch (Exception $exception) {
            DB::rollBack();
            return response()->json(['error' => true, 'message' => $exception->getMessage()]);
        }
        return response()->json(['error' => false, 'message' => 'Order thành công. Vui lòng thanh toán để tiến hành nâng cấp!']);
    }
}