<?php

namespace App\Http\Controllers\Testing;

use App\Enums\CouponStatus;
use App\Enums\CouponType;
use App\Http\Controllers\Controller;
use App\Models\Coupon;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Arr;
use Illuminate\Support\Carbon;
use Illuminate\Validation\ValidationException;

class TestCouponController extends Controller
{
    public function store(Request $request): JsonResponse
    {
        abort_unless(config('e2e.testing_enabled'), 404);

        $payload = $request->input('coupons');
        $definitions = collect(is_array($payload) ? $payload : [])
            ->map(fn ($definition) => $this->normalizeDefinition($definition))
            ->filter()
            ->values();

        if ($definitions->isEmpty()) {
            $definitions = collect($this->defaultDefinitions());
        }

        $created = $definitions->map(function (array $definition) {
            $coupon = Coupon::updateOrCreate(
                ['code' => strtoupper($definition['code'])],
                [
                    'name' => $definition['name'] ?? $definition['code'],
                    'type' => CouponType::from($definition['type']),
                    'status' => CouponStatus::from($definition['status'] ?? CouponStatus::ACTIVE->value),
                    'amount' => $definition['amount'],
                    'currency' => $definition['currency'],
                    'description' => $definition['description'] ?? null,
                    'enabled_for_checkout' => $definition['enabled_for_checkout'],
                    'auto_apply' => $definition['auto_apply'],
                    'is_stackable' => $definition['is_stackable'],
                    'usage_limit' => $definition['usage_limit'],
                    'per_customer_limit' => $definition['per_customer_limit'],
                    'starts_at' => $definition['starts_at'],
                    'ends_at' => $definition['ends_at'],
                ]
            );

            if (array_key_exists('packages', $definition)) {
                $coupon->packages()->sync($definition['packages']);
            }

            return $coupon->fresh(['packages']);
        });

        return response()->json([
            'data' => $created->map(fn (Coupon $coupon) => [
                'id' => $coupon->id,
                'code' => $coupon->code,
                'type' => $coupon->type->value,
                'status' => $coupon->status->value,
            ]),
        ]);
    }

    private function normalizeDefinition(array $definition): array
    {
        $code = strtoupper((string) ($definition['code'] ?? ''));
        $type = $definition['type'] ?? CouponType::PERCENTAGE->value;

        if ($code === '') {
            throw ValidationException::withMessages(['code' => 'Coupon code is required.']);
        }

        $amount = (float) ($definition['amount'] ?? 0);
        if ($amount <= 0) {
            throw ValidationException::withMessages(['amount' => 'Coupon amount must be greater than zero.']);
        }

        $currency = $definition['currency'] ?? null;
        if ($type !== CouponType::PERCENTAGE->value && ! $currency) {
            $currency = 'EUR';
        }

        return [
            'code' => $code,
            'name' => $definition['name'] ?? null,
            'type' => $type,
            'status' => $definition['status'] ?? CouponStatus::ACTIVE->value,
            'amount' => $amount,
            'currency' => $currency ? strtoupper((string) $currency) : null,
            'description' => $definition['description'] ?? null,
            'enabled_for_checkout' => Arr::get($definition, 'enabled_for_checkout', true),
            'auto_apply' => Arr::get($definition, 'auto_apply', false),
            'is_stackable' => Arr::get($definition, 'is_stackable', false),
            'usage_limit' => Arr::get($definition, 'usage_limit'),
            'per_customer_limit' => Arr::get($definition, 'per_customer_limit'),
            'starts_at' => $this->parseDate($definition['starts_at'] ?? null),
            'ends_at' => $this->parseDate($definition['ends_at'] ?? null),
            'packages' => Arr::get($definition, 'packages'),
        ];
    }

    private function parseDate(mixed $value): ?Carbon
    {
        if (! $value) {
            return null;
        }

        if ($value instanceof Carbon) {
            return $value;
        }

        return Carbon::parse($value);
    }

    private function defaultDefinitions(): array
    {
        return [
            [
                'code' => 'PERCENT10',
                'name' => '10% off',
                'type' => CouponType::PERCENTAGE->value,
                'amount' => 10,
                'description' => '10% discount for package flows',
                'usage_limit' => 500,
            ],
            [
                'code' => 'FLAT50',
                'name' => '50 EUR off',
                'type' => CouponType::FLAT->value,
                'amount' => 50,
                'currency' => 'EUR',
                'description' => '50€ discount on qualifying packages',
                'usage_limit' => 200,
            ],
            [
                'code' => 'EXPIRED25',
                'name' => 'Expired 25%',
                'type' => CouponType::PERCENTAGE->value,
                'amount' => 25,
                'description' => 'Expired coupon for error handling tests',
                'starts_at' => now()->subWeeks(2),
                'ends_at' => now()->subDays(2),
            ],
        ];
    }
}