<?php

namespace App\Model\Event;

use App\DB;

class SendUnits extends BaseEvent
{
  public string $type;

  public int $amount;
  public string $unit;

  public int $source;
  public int $destination;

  public ?int $home = null;
  public ?int $residence = null;

  public bool $isCanceled = false;

  /**
   * @return void
   */
  public function __invoke(): void
  {
    if ($this->isCanceled) {
      if ($this->type === 'SendBack' || $this->type === 'Recall') {
        $this->source = $this->home;
        $this->destination = $this->residence;

        $this->borrow();
      }
    }

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

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

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

  private function return(): 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, is_traveling)
        do update set amount = village_units.amount+:amount
      SQL,
      ['amount' => $this->amount, 'type' => $this->unit, 'id' => $this->destination]
    );

    DB::query(
      'delete from village_units where type=:type and home_village_id=:home and residence_village_id=:residence and is_traveling=true',
      ['type' => $this->unit, 'home' => $this->destination, 'residence' => $this->source]
    );
  }

  private function borrow(): 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, is_traveling)
        do update set amount = village_units.amount+:amount
      SQL,
      ['amount' => $this->amount, 'type' => $this->unit, 'home' => $this->source, 'residence' => $this->destination]
    );

    DB::query(
      'delete from village_units where type=:type and home_village_id=:home and residence_village_id=:residence and is_traveling=true',
      ['type' => $this->unit, 'home' => $this->source, 'residence' => $this->source]
    );
  }

  private function gift(): 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, is_traveling)
        do update set amount = village_units.amount+:amount
      SQL,
      ['amount' => $this->amount, 'type' => $this->unit, 'home' => $this->destination, 'residence' => $this->residence]
    );

    DB::query(
      'delete from village_units where type=:type and home_village_id=:home and residence_village_id=:residence and is_traveling=true',
      ['type' => $this->unit, 'home' => $this->source, 'residence' => $this->source]
    );
  }

  public function dbInsert(): void
  {
    DB::query(
      'insert into events (time, village_id) VALUES (:time, :village_id)',
      ['time' => $this->event->time->format('c'), 'village_id' => $this->event->villageId]
    );

    DB::query(
      <<<SQL
      insert into events_send_units (event_id, type, amount, unit, source, destination, home, residence, is_canceled)
      VALUES (:event_id, :type, :amount, :unit, :source, :destination, :home, :residence, :is_canceled)
      SQL,
      [
        'event_id' => DB::$connection->lastInsertId(),
        'type' => $this->type,
        'amount' => $this->amount,
        'unit' => $this->unit,
        'source' => $this->source, 'destination' => $this->destination,
        'home' => $this->home, 'residence' => $this->residence,
        'is_canceled' => $this->isCanceled ?: 0, // @see https://www.php.net/manual/de/pdostatement.execute.php#126013
      ]
    );
  }

  public function dbDelete(): void
  {
    DB::query('delete from events where id=:id', ['id' => $this->eventId]);
    DB::query('delete from events_send_units where id=:id', ['id' => $this->id]);
  }
}