<?php

namespace App\Http\Controllers\Api\Admin\Coupon;

use App\Enums\Product\ProductTypeEnums;
use App\Http\Controllers\Controller;
use App\Http\Requests\Api\Admin\CouponRequest;
use App\Models\Coupon;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;

class CouponController extends Controller
{
    public function index(Request $request): JsonResponse
    {
        $search = trim((string) $request->query('filter', ''));

        $paginator = Coupon::query()
            ->withCount('activeRedemptions as used_count')
            ->withSum('activeRedemptions as discounted_total', 'amount')
            ->when($search !== '', fn ($q) => $q->where(fn ($w) => $w
                ->where('code', 'like', "%{$search}%")
                ->orWhere('name', 'like', "%{$search}%")))
            ->orderByDesc('id')
            ->paginate(min((int) $request->query('per_page', 15), 100));

        return response()->json([
            'error' => false,
            'data' => $paginator->items(),
            'meta' => [
                'total' => $paginator->total(),
                'per_page' => $paginator->perPage(),
                'current_page' => $paginator->currentPage(),
            ],
            'product_types' => array_map(
                fn (ProductTypeEnums $type) => ['value' => $type->value, 'label' => $type->label()],
                ProductTypeEnums::cases(),
            ),
        ]);
    }

    public function store(CouponRequest $request): JsonResponse
    {
        $coupon = Coupon::create($request->validated());

        return response()->json(['error' => false, 'message' => 'Đã tạo mã giảm giá.', 'data' => $coupon], 201);
    }

    public function update(CouponRequest $request, int $id): JsonResponse
    {
        $coupon = Coupon::findOrFail($id);
        $coupon->update($request->validated());

        return response()->json(['error' => false, 'message' => 'Đã cập nhật mã giảm giá.', 'data' => $coupon->fresh()]);
    }

    public function destroy(int $id): JsonResponse
    {
        $coupon = Coupon::findOrFail($id);

        if ($coupon->redemptions()->exists()) {
            return response()->json([
                'error' => true,
                'message' => 'Mã đã được sử dụng, không thể xoá. Hãy tắt mã thay vì xoá.',
            ], 422);
        }

        $coupon->delete();

        return response()->json(['error' => false, 'message' => 'Đã xoá mã giảm giá.']);
    }
}