<?php

namespace App\Services\Hosting;

use App\Models\CustomerHostingOrder;
use App\Models\HostingAccount;
use App\Models\HostingBillingInvoice;
use App\Models\User;
use App\Services\Billing\PaystackService;
use Illuminate\Support\Str;
use Illuminate\Validation\ValidationException;

class HostingRenewalCheckoutService
{
    public function __construct(
        private PaystackService $paystack,
    ) {
    }

    /**
     * @return array{months:int, amount:float, currency:string, billing_cycle:string, amount_minor:int}
     */
    public function renewalQuote(HostingAccount $account, ?int $durationMonths = null): array
    {
        $account->loadMissing(['product', 'latestOrder']);

        if (! $account->canBeRenewed()) {
            throw ValidationException::withMessages([
                'hosting_account_id' => 'This hosting account does not have a configured renewal duration.',
            ]);
        }

        $months = $durationMonths ?? $account->assignedDurationMonths();
        $billingCycle = $this->billingCycleForMonths($months);
        $amount = $this->renewalAmount($account, $months, $billingCycle);

        return [
            'months' => $months,
            'amount' => round($amount, 2),
            'currency' => $account->product?->display_currency ?? 'GHS',
            'billing_cycle' => $billingCycle,
            'amount_minor' => (int) round($amount * 100),
        ];
    }

    /**
     * @return array<int, array{months:int, amount:float, currency:string, billing_cycle:string, label:string, current:bool}>
     */
    public function availableRenewalOptions(HostingAccount $account): array
    {
        $account->loadMissing(['product']);

        if (! $account->canBeRenewed() || ! $account->product) {
            return [];
        }

        $currency = $account->product->display_currency ?? 'GHS';
        $currentMonths = $account->assignedDurationMonths();

        $cycles = [
            ['months' => 1, 'cycle' => CustomerHostingOrder::CYCLE_MONTHLY, 'label' => '1 Month'],
            ['months' => 3, 'cycle' => CustomerHostingOrder::CYCLE_QUARTERLY, 'label' => '3 Months'],
            ['months' => 12, 'cycle' => CustomerHostingOrder::CYCLE_YEARLY, 'label' => '1 Year'],
            ['months' => 24, 'cycle' => CustomerHostingOrder::CYCLE_BIENNIAL, 'label' => '2 Years'],
        ];

        $options = [];

        foreach ($cycles as $cycle) {
            $amount = $this->renewalAmount($account, $cycle['months'], $cycle['cycle']);

            if ($amount <= 0) {
                continue;
            }

            $options[] = [
                'months' => $cycle['months'],
                'amount' => round($amount, 2),
                'currency' => $currency,
                'billing_cycle' => $cycle['cycle'],
                'label' => $cycle['label'],
                'current' => $cycle['months'] === $currentMonths,
            ];
        }

        return $options;
    }

    /**
     * @return array{authorization_url:string, invoice:HostingBillingInvoice, quote:array{months:int, amount:float, currency:string, billing_cycle:string, amount_minor:int}}
     */
    public function beginCheckout(HostingAccount $account, User $user, string $callbackUrl, ?int $durationMonths = null): array
    {
        $quote = $this->renewalQuote($account, $durationMonths);
        $reference = 'HOST-REN-' . strtoupper(Str::random(16));

        $invoice = HostingBillingInvoice::query()->create([
            'user_id' => $user->id,
            'hosting_account_id' => $account->id,
            'invoice_type' => HostingBillingInvoice::TYPE_RENEWAL,
            'status' => HostingBillingInvoice::STATUS_PENDING,
            'currency' => $quote['currency'],
            'subtotal_amount' => $quote['amount'],
            'credit_amount' => 0,
            'total_amount' => $quote['amount'],
            'description' => sprintf(
                'Hosting renewal for %s (%d month%s)',
                $account->primary_domain ?: $account->username,
                $quote['months'],
                $quote['months'] === 1 ? '' : 's'
            ),
            'provider_reference' => $reference,
            'line_items' => [[
                'code' => 'renewal',
                'label' => 'Hosting Renewal',
                'quantity' => 1,
                'amount' => $quote['amount'],
                'description' => sprintf('%d month renewal for %s', $quote['months'], $account->product?->name ?? 'Hosting plan'),
            ]],
            'metadata' => [
                'months' => $quote['months'],
                'billing_cycle' => $quote['billing_cycle'],
            ],
        ]);

        $transaction = $this->paystack->initializeTransaction([
            'email' => (string) $user->email,
            'amount' => $quote['amount_minor'],
            'currency' => $quote['currency'],
            'reference' => $reference,
            'callback_url' => $callbackUrl,
            'metadata' => [
                'context' => 'hosting_renewal',
                'hosting_account_id' => $account->id,
                'invoice_id' => $invoice->id,
                'user_id' => $user->id,
                'months' => $quote['months'],
            ],
        ]);

        $authorizationUrl = (string) ($transaction['authorization_url'] ?? '');

        if ($authorizationUrl === '') {
            throw ValidationException::withMessages([
                'payment' => 'Paystack did not return a checkout URL for the renewal.',
            ]);
        }

        return [
            'authorization_url' => $authorizationUrl,
            'invoice' => $invoice,
            'quote' => $quote,
        ];
    }

    public function completeCheckout(HostingAccount $account, User $user, string $reference): HostingBillingInvoice
    {
        $account->loadMissing(['latestOrder']);

        $invoice = HostingBillingInvoice::query()
            ->where('hosting_account_id', $account->id)
            ->where('user_id', $user->id)
            ->where('invoice_type', HostingBillingInvoice::TYPE_RENEWAL)
            ->where('provider_reference', $reference)
            ->latest('id')
            ->first();

        if (! $invoice) {
            throw ValidationException::withMessages([
                'reference' => 'Renewal invoice could not be found for this payment reference.',
            ]);
        }

        if ($invoice->status === HostingBillingInvoice::STATUS_PAID) {
            return $invoice;
        }

        $transaction = $this->paystack->verifyTransaction($reference);
        $status = strtolower((string) ($transaction['status'] ?? ''));

        if ($status !== 'success') {
            throw ValidationException::withMessages([
                'payment' => 'Renewal payment was not successful.',
            ]);
        }

        $months = (int) data_get($invoice->metadata, 'months', $account->assignedDurationMonths() ?? 0);
        if ($months < 1) {
            throw ValidationException::withMessages([
                'payment' => 'Renewal duration is invalid for this hosting account.',
            ]);
        }

        $paidAt = now();
        $account->renew($months, [
            'renewed_by_user' => $user->id,
            'renewed_at' => $paidAt->toIso8601String(),
            'renewal_invoice_id' => $invoice->id,
        ]);

        if ($account->latestOrder) {
            $account->latestOrder->update([
                'expires_at' => $account->fresh()->expires_at,
                'meta' => array_merge((array) ($account->latestOrder->meta ?? []), [
                    'renewal_invoice_id' => $invoice->id,
                    'renewed_at' => $paidAt->toIso8601String(),
                ]),
            ]);
        }

        $invoice->update([
            'status' => HostingBillingInvoice::STATUS_PAID,
            'paid_at' => $paidAt,
        ]);

        return $invoice->fresh();
    }

    private function billingCycleForMonths(int $months): string
    {
        return match ($months) {
            1 => CustomerHostingOrder::CYCLE_MONTHLY,
            3 => CustomerHostingOrder::CYCLE_QUARTERLY,
            12 => CustomerHostingOrder::CYCLE_YEARLY,
            24 => CustomerHostingOrder::CYCLE_BIENNIAL,
            default => CustomerHostingOrder::CYCLE_MONTHLY,
        };
    }

    private function renewalAmount(HostingAccount $account, int $months, string $billingCycle): float
    {
        $price = $account->product?->getPriceForCycle($billingCycle);

        if ($price !== null && in_array($months, [1, 3, 12, 24], true)) {
            return (float) $price;
        }

        $monthly = (float) ($account->product?->getPriceForCycle(CustomerHostingOrder::CYCLE_MONTHLY) ?? 0);

        return $monthly * $months;
    }
}