<?php

namespace App\Services\PayPal;

use App\Models\CheckoutSession;
use App\Models\Package;
use Illuminate\Support\Arr;
use Illuminate\Support\Str;

class PayPalOrderService
{
    public function __construct(private readonly PayPalClient $client) {}

    /**
     * @param  array{return_url?: string|null, cancel_url?: string|null, locale?: string|null, request_id?: string|null}  $options
     * @return array<string, mixed>
     */
    public function createOrder(CheckoutSession $session, Package $package, array $options = []): array
    {
        $currency = strtoupper((string) ($session->currency ?: $package->currency ?: 'EUR'));
        $total = $this->formatAmount((float) $session->amount_total);
        $subtotal = $this->formatAmount((float) $session->amount_subtotal);
        $discount = $this->formatAmount((float) $session->amount_discount);

        $amount = [
            'currency_code' => $currency,
            'value' => $total,
        ];

        if ($subtotal !== null && $discount !== null) {
            $amount['breakdown'] = [
                'item_total' => [
                    'currency_code' => $currency,
                    'value' => $subtotal,
                ],
                'discount' => [
                    'currency_code' => $currency,
                    'value' => $discount,
                ],
            ];
        }

        $purchaseUnit = [
            'reference_id' => 'package-'.$package->id,
            'description' => Str::limit($package->name ?? 'Package', 127, ''),
            'custom_id' => $session->id,
            'amount' => $amount,
        ];

        $applicationContext = array_filter([
            'brand_name' => config('app.name', 'Fotospiel'),
            'landing_page' => 'NO_PREFERENCE',
            'user_action' => 'PAY_NOW',
            'shipping_preference' => 'NO_SHIPPING',
            'locale' => $this->resolveLocale($options['locale'] ?? $session->locale),
            'return_url' => $options['return_url'] ?? null,
            'cancel_url' => $options['cancel_url'] ?? null,
        ], static fn ($value) => $value !== null && $value !== '');

        $payload = [
            'intent' => 'CAPTURE',
            'purchase_units' => [$purchaseUnit],
            'application_context' => $applicationContext,
        ];

        $headers = [];
        $requestId = $options['request_id'] ?? $session->id;
        if (is_string($requestId) && $requestId !== '') {
            $headers['PayPal-Request-Id'] = $requestId;
        }

        return $this->client->post('/v2/checkout/orders', $payload, $headers);
    }

    /**
     * @param  array{request_id?: string|null}  $options
     * @return array<string, mixed>
     */
    public function captureOrder(string $orderId, array $options = []): array
    {
        $headers = [];
        $requestId = $options['request_id'] ?? null;
        if (is_string($requestId) && $requestId !== '') {
            $headers['PayPal-Request-Id'] = $requestId;
        }

        return $this->client->post(sprintf('/v2/checkout/orders/%s/capture', $orderId), [], $headers);
    }

    public function resolveApproveUrl(array $payload): ?string
    {
        $links = Arr::get($payload, 'links', []);
        if (! is_array($links)) {
            return null;
        }

        foreach ($links as $link) {
            if (! is_array($link)) {
                continue;
            }

            if (($link['rel'] ?? null) === 'approve') {
                return is_string($link['href'] ?? null) ? $link['href'] : null;
            }
        }

        return null;
    }

    public function resolveCaptureId(array $payload): ?string
    {
        $captureId = Arr::get($payload, 'purchase_units.0.payments.captures.0.id');

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

    /**
     * @return array{currency?: string, total?: float}
     */
    public function resolveTotals(array $payload): array
    {
        $amount = Arr::get($payload, 'purchase_units.0.payments.captures.0.amount')
            ?? Arr::get($payload, '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);
    }

    protected function resolveLocale(?string $locale): ?string
    {
        if (! $locale) {
            return null;
        }

        $normalized = str_replace('_', '-', $locale);

        return match (strtolower($normalized)) {
            'de', 'de-de', 'de-at', 'de-ch' => 'de-DE',
            'en', 'en-gb' => 'en-GB',
            default => 'en-US',
        };
    }

    protected function formatAmount(float $amount): ?string
    {
        if (! is_finite($amount)) {
            return null;
        }

        return number_format($amount, 2, '.', '');
    }
}