<?php

namespace App\Services\Notifications;

use App\Models\MiniPayment;
use App\Models\User;
use App\Notifications\Mini\MiniAlertNotification;
use Illuminate\Support\Facades\Log;

class MiniNotificationService
{
    public function __construct(private FcmService $fcm) {}

    public function paymentReceived(MiniPayment $payment): void
    {
        $payment->loadMissing(['qrCode', 'merchant']);
        $merchant = $payment->merchant;

        if (! $merchant) {
            return;
        }

        $businessName = $payment->qrCode?->content()['business_name'] ?? $payment->qrCode?->label ?? 'Payment QR';
        $amount = $this->formatMoney($payment->currency, $payment->merchant_amount_minor ?: $payment->amount_minor);
        $title = 'Payment received';
        $message = sprintf('%s paid %s to %s.', $this->payerLabel($payment), $amount, $businessName);

        $this->alert(
            $merchant,
            $title,
            $message,
            'payment',
            route('mini.payments.index'),
            'payment_received',
            [
                'payment_id' => $payment->id,
                'reference' => $payment->reference,
                'amount_minor' => $payment->amount_minor,
                'currency' => $payment->currency,
            ],
            respectPayoutPref: false,
        );
    }

    public function withdrawalSubmitted(User $user, float $amountMajor, string $currency = 'GHS'): void
    {
        if (! $this->payoutAlertsEnabled($user)) {
            return;
        }

        $amount = sprintf('%s %s', $currency, number_format($amountMajor, 2));
        $this->alert(
            $user,
            'Withdrawal requested',
            sprintf('Your withdrawal of %s has been submitted and is being processed.', $amount),
            'payout',
            route('mini.payouts'),
            'withdrawal_submitted',
            ['amount_major' => $amountMajor, 'currency' => $currency],
            respectPayoutPref: false,
        );
    }

    public function walletCredited(User $user, int $amountMinor, string $currency, string $description): void
    {
        if (! $this->payoutAlertsEnabled($user)) {
            return;
        }

        $amount = $this->formatMoney($currency, $amountMinor);
        $this->alert(
            $user,
            'Wallet credited',
            sprintf('%s added to your wallet. %s', $amount, $description),
            'wallet',
            route('mini.payouts'),
            'wallet_credited',
            ['amount_minor' => $amountMinor, 'currency' => $currency],
            respectPayoutPref: false,
        );
    }

    /**
     * @param  array<string, mixed>  $extra
     */
    private function alert(
        User $user,
        string $title,
        string $message,
        string $icon,
        ?string $url,
        string $milestone,
        array $extra = [],
        bool $respectPayoutPref = true,
    ): void {
        if ($respectPayoutPref && ! $this->payoutAlertsEnabled($user)) {
            return;
        }

        $user->notify(new MiniAlertNotification($title, $message, $icon, $url, $milestone, $extra));
        $this->pushToDevices($user, $title, $message, array_merge($extra, [
            'milestone' => $milestone,
            'url' => $url,
        ]));
    }

  /** @param  array<string, mixed>  $data */
    private function pushToDevices(User $user, string $title, string $body, array $data = []): void
    {
        if (! $this->fcm->isConfigured() || ! $this->shouldAttemptFcm($user)) {
            return;
        }

        $windowDays = (int) config('notifications.fcm_active_user_within_days', 60);
        $cutoff = now()->subDays($windowDays);

        $tokens = $user->pushTokens()
            ->where(function ($query) use ($cutoff) {
                $query->where('last_seen_at', '>=', $cutoff)
                    ->orWhere('updated_at', '>=', $cutoff);
            })
            ->get();

        foreach ($tokens as $device) {
            try {
                $outcome = $this->fcm->send($device->token, $title, $body, $data);

                if ($outcome === FcmService::INVALID_TOKEN) {
                    $device->delete();
                }
            } catch (\Throwable $e) {
                Log::warning('Mini push failed', [
                    'user_id' => $user->id,
                    'error' => $e->getMessage(),
                ]);
            }
        }
    }

    private function shouldAttemptFcm(User $user): bool
    {
        if ($user->pushTokens()->doesntExist()) {
            return false;
        }

        $windowDays = (int) config('notifications.fcm_active_user_within_days', 60);

        if ($user->last_app_active_at === null) {
            return false;
        }

        return $user->last_app_active_at->gte(now()->subDays($windowDays));
    }

    private function payoutAlertsEnabled(User $user): bool
    {
        return (bool) ($user->getOrCreateQrSetting()->notify_payouts ?? true);
    }

    private function formatMoney(string $currency, int $amountMinor): string
    {
        return sprintf('%s %s', $currency, number_format($amountMinor / 100, 2));
    }

    private function payerLabel(MiniPayment $payment): string
    {
        if ($payment->payer_name) {
            return $payment->payer_name;
        }

        if ($payment->payer_phone) {
            return $payment->payer_phone;
        }

        return 'A customer';
    }
}