<?php

namespace App\Listeners;

use App\Events\BusinessUpdate;
use App\Models\Business;
use App\Notifications\DBNotification;
use App\Notifications\MailNotification;
use Illuminate\Support\Facades\Notification;

class BusinessUpdateListener
{
    public function handle(BusinessUpdate $event)
    {
        $payload = $event->message;
        $business = Business::findOrFail($payload->business)->load('owners');

        $this->checkWalletIsRunningLow($business);
        $this->checkWalletIsEmptyOrNegative($business);
        $this->accountHasBeenSuspended($business);
    }

    public function checkWalletIsRunningLow(Business $business): void
    {
        $moving_average_days = 7;
        $predict_ahead_hours = 24;

        $hours = $moving_average_days * 24;
        $business->load([
            'cost' => fn($query) => $query->where('created_at', '>=', now('Asia/Tehran')->subHours($hours)),
        ]);

        // The wallet is running out
        // Calculate the average consumption of the N past days
        $average_cost = $business->cost->sum('cost') / $hours;

        // Average hourly consumption multiplied by the next 24 hours
        // If the account does not charge as much as in the next 24 hours, notified.
        $message = ['body' => __('notification.business.wallet_almost_empty')];
        if (($business->wallet / $predict_ahead_hours) < $average_cost) {
            Notification::send($business->owners, new MailNotification($message));
            Notification::send($business->owners, new DBNotification($message));
        }
    }

    public function checkWalletIsEmptyOrNegative(Business $business): void
    {
        $message = ['body' => __('notification.business.wallet_empty')];
        if ($business->wallet <= 0) {
            Notification::send($business->owners, new MailNotification($message));
            Notification::send($business->owners, new DBNotification($message));
        }
    }

    public function accountHasBeenSuspended(Business $business): void
    {
        if ($business->wallet > 0) {
            return;
        }

        $recent_payments_number = 10;
        $negativity_threshold = 20;
        $business->load([
            'transactions' => fn($query) => $query->where('succeeded', '=', true)
                ->orderBy('created_at')
                ->take($recent_payments_number),
        ]);

        // Your account has been blocked.
        // What is the average of the last 10 payments?
        $average_payment = $business->transactions->average('amount');

        $threshold = $average_payment / 100 * $negativity_threshold;
        $message = ['body' => __('notification.business.suspended')];
        if ($business->wallet < $threshold) {
            $business->update(['suspended_at' => now(),]);
            Notification::send($business->owners, new MailNotification($message));
            Notification::send($business->owners, new DBNotification($message));
        }
    }
}