<?php

namespace App\Services\GiftVouchers;

use App\Models\CheckoutSession;
use App\Models\GiftVoucher;
use App\Services\LemonSqueezy\LemonSqueezyCheckoutService;
use App\Services\PayPal\Exceptions\PayPalException;
use App\Services\PayPal\PayPalOrderService;
use Illuminate\Support\Facades\App;
use Illuminate\Support\Str;
use Illuminate\Validation\ValidationException;

class GiftVoucherCheckoutService
{
    public function __construct(
        private readonly LemonSqueezyCheckoutService $checkout,
        private readonly PayPalOrderService $paypalOrders,
    ) {}

    /**
     * @return array<int, array{key:string,label:string,amount:float,currency:string,lemonsqueezy_variant_id?:string|null,can_checkout:bool}>
     */
    public function tiers(): array
    {
        $provider = $this->resolveProvider();
        $checkoutCurrency = Str::upper((string) config('checkout.currency', 'EUR'));

        return collect(config('gift-vouchers.tiers', []))
            ->map(function (array $tier) use ($provider, $checkoutCurrency): array {
                $currency = Str::upper($tier['currency'] ?? 'EUR');
                $variantId = $tier['lemonsqueezy_variant_id'] ?? null;
                $canCheckout = $provider === CheckoutSession::PROVIDER_PAYPAL
                    ? $currency === $checkoutCurrency
                    : ! empty($variantId);

                return [
                    'key' => $tier['key'],
                    'label' => $tier['label'],
                    'amount' => (float) $tier['amount'],
                    'currency' => $currency,
                    'lemonsqueezy_variant_id' => $variantId,
                    'can_checkout' => $canCheckout,
                ];
            })
            ->values()
            ->all();
    }

    /**
     * @param  array{tier_key:string,purchaser_email:string,recipient_email?:string|null,recipient_name?:string|null,message?:string|null,success_url?:string|null,return_url?:string|null}  $data
     * @return array{checkout_url:?string,expires_at:?string,id:?string}
     */
    public function create(array $data): array
    {
        $provider = $this->resolveProvider();

        if ($provider === CheckoutSession::PROVIDER_PAYPAL) {
            return $this->createPayPalCheckout($data);
        }

        $tier = $this->findTier($data['tier_key']);

        if (! $tier || empty($tier['lemonsqueezy_variant_id'])) {
            throw ValidationException::withMessages([
                'tier_key' => __('Gift voucher is not available right now.'),
            ]);
        }

        $customData = array_filter([
            'type' => 'gift_voucher',
            'tier_key' => $tier['key'],
            'purchaser_email' => $data['purchaser_email'],
            'recipient_email' => $data['recipient_email'] ?? null,
            'recipient_name' => $data['recipient_name'] ?? null,
            'message' => $data['message'] ?? null,
            'app_locale' => App::getLocale(),
            'success_url' => $data['success_url'] ?? null,
            'return_url' => $data['return_url'] ?? null,
            'lemonsqueezy_variant_id' => $tier['lemonsqueezy_variant_id'],
        ], static fn ($value) => $value !== null && $value !== '');

        return $this->checkout->createVariantCheckout(
            (string) $tier['lemonsqueezy_variant_id'],
            $customData,
            [
                'success_url' => $data['success_url'] ?? null,
                'return_url' => $data['return_url'] ?? null,
                'customer_email' => $data['purchaser_email'],
            ]
        );
    }

    /**
     * @return array<string, mixed>|null
     */
    protected function findTier(string $key): ?array
    {
        $tiers = collect(config('gift-vouchers.tiers', []))
            ->keyBy('key');

        $tier = $tiers->get($key);

        if (! $tier) {
            return null;
        }

        $tier['currency'] = Str::upper($tier['currency'] ?? 'EUR');

        return $tier;
    }

    /**
     * @param  array{tier_key:string,purchaser_email:string,recipient_email?:string|null,recipient_name?:string|null,message?:string|null,success_url?:string|null,return_url?:string|null}  $data
     * @return array{checkout_url:?string,expires_at:?string,id:?string}
     */
    protected function createPayPalCheckout(array $data): array
    {
        $tier = $this->findTier($data['tier_key']);

        if (! $tier) {
            throw ValidationException::withMessages([
                'tier_key' => __('Gift voucher is not available right now.'),
            ]);
        }

        $currency = Str::upper($tier['currency'] ?? 'EUR');
        $checkoutCurrency = Str::upper((string) config('checkout.currency', 'EUR'));

        if ($currency !== $checkoutCurrency) {
            throw ValidationException::withMessages([
                'tier_key' => __('Gift voucher currency is not supported.'),
            ]);
        }

        $voucher = GiftVoucher::create([
            'code' => $this->generateCode(),
            'amount' => (float) $tier['amount'],
            'currency' => $currency,
            'status' => GiftVoucher::STATUS_PENDING,
            'purchaser_email' => $data['purchaser_email'],
            'recipient_email' => $data['recipient_email'] ?? null,
            'recipient_name' => $data['recipient_name'] ?? null,
            'message' => $data['message'] ?? null,
            'metadata' => array_filter([
                'tier_key' => $tier['key'],
                'app_locale' => App::getLocale(),
                'success_url' => $data['success_url'] ?? null,
                'return_url' => $data['return_url'] ?? null,
            ], static fn ($value) => $value !== null && $value !== ''),
            'expires_at' => now()->addYears((int) config('gift-vouchers.default_valid_years', 5)),
        ]);

        $successUrl = $data['success_url'] ?? null;
        $returnUrl = $data['return_url'] ?? $successUrl;
        $paypalReturnUrl = route('paypal.gift-voucher.return', absolute: true);

        try {
            $order = $this->paypalOrders->createSimpleOrder(
                referenceId: 'gift-voucher-'.$voucher->id,
                description: $tier['label'] ?? 'Gift Voucher',
                amount: (float) $tier['amount'],
                currency: $currency,
                options: [
                    'custom_id' => 'gift_voucher_'.$voucher->id,
                    'return_url' => $paypalReturnUrl,
                    'cancel_url' => $paypalReturnUrl,
                    'locale' => App::getLocale(),
                    'request_id' => 'gift-voucher-'.$voucher->id,
                ],
            );
        } catch (PayPalException) {
            $voucher->delete();

            throw ValidationException::withMessages([
                'tier_key' => __('Unable to create PayPal checkout.'),
            ]);
        }

        $orderId = $order['id'] ?? null;

        if (! is_string($orderId) || $orderId === '') {
            $voucher->delete();

            throw ValidationException::withMessages([
                'tier_key' => __('PayPal order ID missing.'),
            ]);
        }

        $approveUrl = $this->paypalOrders->resolveApproveUrl($order);

        $voucher->forceFill([
            'paypal_order_id' => $orderId,
            'metadata' => array_merge($voucher->metadata ?? [], array_filter([
                'paypal_order_id' => $orderId,
                'paypal_approve_url' => $approveUrl,
                'paypal_success_url' => $successUrl,
                'paypal_cancel_url' => $returnUrl,
                'paypal_created_at' => now()->toIso8601String(),
            ])),
        ])->save();

        return [
            'checkout_url' => $approveUrl,
            'expires_at' => null,
            'id' => $orderId,
        ];
    }

    protected function resolveProvider(): ?string
    {
        $provider = config('gift-vouchers.provider');

        if (is_string($provider) && $provider !== '') {
            return $provider;
        }

        $default = config('checkout.default_provider');

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

    protected function generateCode(): string
    {
        return 'GIFT-'.Str::upper(Str::random(8));
    }
}