<?php

namespace App\Http\Controllers;

use App\Models\GiftVoucher;
use App\Services\GiftVouchers\GiftVoucherService;
use App\Services\PayPal\Exceptions\PayPalException;
use App\Services\PayPal\PayPalOrderService;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Arr;
use Illuminate\Support\Str;

class PayPalGiftVoucherReturnController extends Controller
{
    public function __construct(
        private readonly PayPalOrderService $orders,
        private readonly GiftVoucherService $vouchers,
    ) {}

    public function __invoke(Request $request): RedirectResponse
    {
        $orderId = $this->resolveOrderId($request);
        $fallback = $this->resolveFallbackUrl();

        if (! $orderId) {
            return redirect()->to($fallback);
        }

        $voucher = GiftVoucher::query()
            ->where('paypal_order_id', $orderId)
            ->first();

        if (! $voucher) {
            return redirect()->to($fallback);
        }

        $successUrl = Arr::get($voucher->metadata ?? [], 'paypal_success_url')
            ?? Arr::get($voucher->metadata ?? [], 'success_url');
        $cancelUrl = Arr::get($voucher->metadata ?? [], 'paypal_cancel_url')
            ?? Arr::get($voucher->metadata ?? [], 'return_url');

        if (in_array($voucher->status, [GiftVoucher::STATUS_ISSUED, GiftVoucher::STATUS_REDEEMED], true)) {
            return redirect()->to($this->resolveSafeRedirect($this->appendOrderId($successUrl, $orderId), $fallback));
        }

        try {
            $capture = $this->orders->captureOrder($orderId, [
                'request_id' => 'gift-voucher-'.$voucher->id,
            ]);
        } catch (PayPalException $exception) {
            return redirect()->to($this->resolveSafeRedirect($cancelUrl, $fallback));
        }

        $this->vouchers->issueFromPayPal($voucher, $capture, $orderId);

        return redirect()->to($this->resolveSafeRedirect($this->appendOrderId($successUrl, $orderId), $fallback));
    }

    protected function resolveOrderId(Request $request): ?string
    {
        $candidate = $request->query('token') ?? $request->query('order_id');

        if (! is_string($candidate) || $candidate === '') {
            return null;
        }

        return $candidate;
    }

    protected function resolveFallbackUrl(): string
    {
        return rtrim((string) config('app.url', url('/')), '/') ?: url('/');
    }

    protected function resolveSafeRedirect(?string $target, string $fallback): string
    {
        if (! $target) {
            return $fallback;
        }

        if (Str::startsWith($target, ['/'])) {
            return $target;
        }

        $appHost = parse_url($fallback, PHP_URL_HOST);
        $targetHost = parse_url($target, PHP_URL_HOST);

        if ($appHost && $targetHost && Str::lower($appHost) === Str::lower($targetHost)) {
            return $target;
        }

        return $fallback;
    }

    protected function appendOrderId(?string $url, string $orderId): ?string
    {
        if (! $url) {
            return null;
        }

        $parts = parse_url($url);
        if (! $parts) {
            return $url;
        }

        $query = [];
        if (! empty($parts['query'])) {
            parse_str($parts['query'], $query);
        }

        if (! isset($query['order_id'])) {
            $query['order_id'] = $orderId;
        }

        $scheme = $parts['scheme'] ?? null;
        $host = $parts['host'] ?? null;
        $port = isset($parts['port']) ? ':'.$parts['port'] : '';
        $path = $parts['path'] ?? '';
        $fragment = isset($parts['fragment']) ? '#'.$parts['fragment'] : '';
        $queryString = $query ? '?'.http_build_query($query) : '';

        if ($scheme && $host) {
            return $scheme.'://'.$host.$port.$path.$queryString.$fragment;
        }

        return $path.$queryString.$fragment;
    }
}