<?php

namespace models;

use mt;
use phpcommon\SqlHelper;

class FragmentPool extends BaseModel {

    public static function dropHero($type)
    {
        $items = self::internalGet(0, $type);
        if (count($items)) {
            $idx = array_rand($items, 1);
            $fragmentId = $items[$idx]['fragment_id'];
            self::decNum($fragmentId);
            return $fragmentId;
        }
        return 0;
    }

    public static function dropGun($type)
    {
        $items = self::internalGet(1, $type);
        if (count($items)) {
            $idx = array_rand($items, 1);
            $fragmentId = $items[$idx]['fragment_id'];
            self::decNum($fragmentId);
            return $fragmentId;
        }
        return 0;
    }

    public static function getHeroNum($type)
    {
        $items = self::internalGet(0, $type);
        $num = 0;
        foreach ($items as $item) {
            $num += $item['fragment_num'];
        }
        return $num;
    }

    public static function getGunNum($type)
    {
        $items = self::internalGet(1, $type);
        $num = 0;
        foreach ($items as $item) {
            $num += $item['fragment_num'];
        }
        return $num;
    }

    private static function internalGet($fragmentType, $type)
    {
        $allocTime = self::getAllocTime();
        $rows = SqlHelper::ormSelect
             (myself()->_getSelfMysql(),
                 't_fragment_pool',
                 array(
                     'type' => $type,
                     'fragment_type' => $fragmentType,
                     'alloc_time' => $allocTime,
                 )
                );
        $items = array();
        if ($rows) {
            foreach ($rows as $row) {
                if ($row['fragment_num'] > 0) {
                    array_push($items, $row);
                }
            }
        }
        return $items;
    }

    private static function decNum($itemId)
    {
        $allocTime = self::getAllocTime();
        SqlHelper::update
            (myself()->_getSelfMysql(),
             't_fragment_pool',
             array(
                 'fragment_id' => $itemId,
                 'alloc_time' => $allocTime,
             ),
             array(
                 'fragment_num' => function () {
                     return 'GREATEST(0, fragment_num - 1)';
                 },
                 'alloced_num' => function () {
                     return 'alloced_num + 1';
                 }
             )
            );
    }

    private static function getAllocTime()
    {
        $allocTime = myself()->_getNowDaySeconds() +
                   intval((myself()->_getNowTime() - myself()->_getNowDaySeconds()) / 3600) * 3600;
        return $allocTime;
    }

}