<?php

namespace App\Http\Controllers;

use App\Models\EventPackageAddon;
use App\Services\Addons\EventAddonPurchaseService;
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 PayPalAddonReturnController extends Controller
{
    public function __construct(
        private readonly PayPalOrderService $orders,
        private readonly EventAddonPurchaseService $addons,
    ) {}

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

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

        $addon = EventPackageAddon::query()
            ->where('checkout_id', $orderId)
            ->first();

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

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

        if ($addon->status === 'completed') {
            return redirect()->to($this->resolveSafeRedirect($successUrl, $fallback));
        }

        try {
            $capture = $this->orders->captureOrder($orderId, [
                'request_id' => 'addon-'.$addon->id,
            ]);
        } catch (PayPalException $exception) {
            $this->addons->fail($addon, 'paypal_capture_failed', [
                'message' => $exception->getMessage(),
                'status' => $exception->status(),
            ]);

            return redirect()->to($this->resolveSafeRedirect($cancelUrl, $fallback));
        }

        $captureId = $this->resolveCaptureId($capture);
        $totals = $this->resolveTotals($capture);

        $this->addons->complete(
            $addon,
            $capture,
            $captureId,
            $orderId,
            $totals['total'] ?? null,
            $totals['currency'] ?? null,
            [
                'paypal_order_id' => $orderId,
                'paypal_capture_id' => $captureId,
                'paypal_status' => $capture['status'] ?? null,
                'paypal_totals' => $totals ?: null,
                'paypal_captured_at' => now()->toIso8601String(),
            ],
        );

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

    /**
     * @param  array<string, mixed>  $capture
     */
    protected function resolveCaptureId(array $capture): ?string
    {
        $captureId = Arr::get($capture, 'purchase_units.0.payments.captures.0.id')
            ?? Arr::get($capture, 'id');

        return is_string($captureId) && $captureId !== '' ? $captureId : null;
    }

    /**
     * @param  array<string, mixed>  $capture
     * @return array{currency?: string, total?: float}
     */
    protected function resolveTotals(array $capture): array
    {
        $amount = Arr::get($capture, 'purchase_units.0.payments.captures.0.amount')
            ?? Arr::get($capture, 'purchase_units.0.amount');

        if (! is_array($amount)) {
            return [];
        }

        $currency = Arr::get($amount, 'currency_code');
        $total = Arr::get($amount, 'value');

        return array_filter([
            'currency' => is_string($currency) ? strtoupper($currency) : null,
            'total' => is_numeric($total) ? (float) $total : null,
        ], static fn ($value) => $value !== null);
    }
}