<?php

namespace App\Model\Event;

use App\DB;
use App\Model\Event;

class SendUnits extends Event
{
  /**
   * @return void
   */
  public function __invoke(): void
  {
    $payload = json_decode($this->payload, true);

    if (isset($payload['cancel'])) {
      if ($payload['type'] === 'SendBack') {
        $payload['source'] = $payload['cancel']['home'];
        $payload['destination'] = $payload['cancel']['residence'];

        $this->borrow($payload);
      }
    }

    else {
      if ($payload['type'] === 'Recall' || $payload['type'] === 'SendBack') {
        $this->return($payload);
      }

      else if ($payload['type'] === 'Borrow') {
        $this->borrow($payload);
      }

      else if ($payload['type'] === 'Gift') {
        $this->gift($payload);
      }
    }
  }

  /**
   * @param array $payload
   */
  private function return(array $payload): void
  {
    DB::query(
      <<<SQL
      insert into village_units (amount, type, is_traveling, home_village_id, residence_village_id)
      values (:amount, :type, false, :id, :id)
        on conflict (type, home_village_id, residence_village_id)
        do update set amount = village_units.amount+:amount
      SQL,
      ['amount' => $payload['amount'], 'type' => $payload['unit'], 'id' => $payload['destination']]
    );
  }

  /**
   * @param array $payload
   */
  private function borrow(array $payload): void
  {
    DB::query(
      <<<SQL
      insert into village_units (amount, type, is_traveling, home_village_id, residence_village_id)
      values (:amount, :type, false, :home, :residence)
        on conflict (type, home_village_id, residence_village_id)
        do update set amount = village_units.amount+:amount
      SQL,
      ['amount' => $payload['amount'], 'type' => $payload['unit'], 'home' => $payload['source'], 'residence' => $payload['destination']]
    );
  }

  /**
   * @param array $payload
   */
  private function gift(array $payload): void
  {
    DB::query(
      <<<SQL
      insert into village_units (amount, type, is_traveling, home_village_id, residence_village_id)
      values (:amount, :type, false, :home, :residence)
        on conflict (type, home_village_id, residence_village_id)
        do update set amount = village_units.amount+:amount
      SQL,
      ['amount' => $payload['amount'], 'type' => $payload['unit'], 'home' => $payload['destination'], 'residence' => $payload['destination']]
    );
  }
}