<?php

namespace App\Http\Controllers\Customer;

use App\Http\Controllers\Controller;
use App\Models\ConditionalOrder;
use App\Models\Customer;
use App\Models\Product;
use App\Services\ConditionalOrderService;
use App\Services\ConfigService;
use App\Support\ConditionalOrderValidation;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Symfony\Component\HttpKernel\Exception\UnprocessableEntityHttpException;

class ConditionalOrderController extends Controller
{
    public function index()
    {
        $customer = $this->authCustomer();
        app(ConditionalOrderService::class)->assertCustomerCanUse($customer);

        $items = ConditionalOrder::query()
            ->with('product')
            ->where('customer_id', $customer->id)
            ->orderByDesc('id')
            ->get();

        return response()->json($items);
    }

    public function store(Request $request)
    {
        $customer = $this->authCustomer();
        $service = app(ConditionalOrderService::class);
        $service->assertCustomerCanUse($customer);
        $service->assertWithinLimit($customer);

        $data = $this->validatedPayload($request);
        $data['customer_id'] = $customer->id;

        $fee = 0;
        DB::beginTransaction();
        try {
            $fee = $service->chargeRegistrationFee($customer);
            $order = ConditionalOrder::create([
                ...$data,
                'is_active' => $data['is_active'] ?? true,
                'status' => ConditionalOrder::STATUS_PENDING,
                'fee_charged' => $fee,
            ]);
            DB::commit();
        } catch (\Throwable $e) {
            DB::rollBack();
            throw $e;
        }

        return response()->json($order->load('product'), 201);
    }

    public function update(Request $request, int $id)
    {
        $customer = $this->authCustomer();
        app(ConditionalOrderService::class)->assertCustomerCanUse($customer);

        $order = ConditionalOrder::query()
            ->where('customer_id', $customer->id)
            ->findOrFail($id);

        if ($order->status !== ConditionalOrder::STATUS_PENDING) {
            throw new UnprocessableEntityHttpException('فقط سفارش در انتظار قابل ویرایش است.');
        }

        $data = $this->validatedPayload($request, true);
        unset($data['customer_id']);
        $order->update($data);

        return response()->json($order->fresh()->load('product'));
    }

    public function destroy(int $id)
    {
        $customer = $this->authCustomer();
        app(ConditionalOrderService::class)->assertCustomerCanUse($customer);

        $order = ConditionalOrder::query()
            ->where('customer_id', $customer->id)
            ->findOrFail($id);
        $order->delete();

        return response()->json(true);
    }

    public function toggleActive(int $id)
    {
        $customer = $this->authCustomer();
        app(ConditionalOrderService::class)->assertCustomerCanUse($customer);

        $order = ConditionalOrder::query()
            ->where('customer_id', $customer->id)
            ->findOrFail($id);

        if ($order->status !== ConditionalOrder::STATUS_PENDING) {
            throw new UnprocessableEntityHttpException('فقط سفارش در انتظار قابل فعال/غیرفعال‌سازی است.');
        }

        $order->is_active = ! $order->is_active;
        $order->save();

        return response()->json(['is_active' => (bool) $order->is_active]);
    }

    private function authCustomer(): Customer
    {
        $customer = auth('customer')->user();
        if (! $customer) {
            throw new UnprocessableEntityHttpException('احراز هویت نامعتبر است.');
        }

        return $customer;
    }

    private function validatedPayload(Request $request, bool $partial = false): array
    {
        $rules = [
            'product_id' => ($partial ? 'sometimes|' : '') . 'required|integer|exists:products,id',
            'direction' => ($partial ? 'sometimes|' : '') . 'required|integer|in:1,2',
            'price_condition' => ($partial ? 'sometimes|' : '') . 'required|in:gte,lte',
            'trigger_price' => ($partial ? 'sometimes|' : '') . 'required|numeric|min:1',
            'amount' => 'nullable|numeric|min:0',
            'number' => 'nullable|numeric|min:0',
            'expires_at' => 'nullable|date',
            'description' => 'nullable|string|max:2000',
            'is_active' => 'sometimes|boolean',
        ];

        $data = $request->validate(
            $rules,
            ConditionalOrderValidation::messages(),
            ConditionalOrderValidation::attributes()
        );

        $amount = isset($data['amount']) ? (float) $data['amount'] : null;
        $number = isset($data['number']) ? (float) $data['number'] : null;

        if (! $partial && ($amount === null || $amount <= 0) && ($number === null || $number <= 0)) {
            throw new UnprocessableEntityHttpException('مقدار گرم یا تعداد را وارد کنید.');
        }

        if (! empty($data['expires_at'])) {
            try {
                $expires = \Illuminate\Support\Carbon::parse(
                    $data['expires_at'],
                    config('app.timezone')
                )->timezone(config('app.timezone'));
            } catch (\Throwable $e) {
                throw new UnprocessableEntityHttpException('زمان اعتبار تاریخ معتبری نیست.');
            }
            if ($expires->lte(now())) {
                throw new UnprocessableEntityHttpException('زمان اعتبار باید بعد از تایم فعلی باشد.');
            }
            // Wall-clock in app TZ; column is DATETIME (not TIMESTAMP) to avoid double TZ shift.
            $data['expires_at'] = $expires->format('Y-m-d H:i:s');
        }

        $productId = (int) ($data['product_id'] ?? $request->input('product_id') ?? 0);
        $product = $productId > 0 ? Product::find($productId) : null;
        if ($product && $amount !== null && $amount > 0 && ($number === null || $number <= 0)) {
            $group = trim((string) ($product->group_type ?? ''));
            $isMelted = in_array($group, ['آبشده', 'کاتد مس'], true)
                || (bool) ($product->trade_by_quantity ?? false)
                || ((int) $product->id === (int) app(ConfigService::class)->mainProductId());

            if (! $isMelted && (float) ($product->amount ?? 0) > 0) {
                $data['number'] = $amount;
                $data['amount'] = null;
            }
        }

        return $data;
    }
}