<?php

namespace mt;

use phpcommon;

class Dailyselection
{

    public static function get($id)
    {
        return getXVal(self::getMetaList(), $id);
    }

    public static function randomBySlot($slot)
    {
        self::mustBeSlotGroupHash();
        $metas = getXVal(self::$slotGroupHash, $slot);
        if (empty($metas)) {
            return null;
        }
        $totalWeight = 0;
        foreach ($metas as $meta) {
            $totalWeight += $meta['weight'];
        }
        if ($totalWeight > 0) {
            $currWeight = 0;
            $rnd = rand() % $totalWeight;
            foreach ($metas as $meta) {
                $currWeight += $meta['weight'];
                if ($currWeight > $rnd) {
                    return $meta;
                }
            }
        }
        return  null;
    }

    protected static function getMetaList()
    {
        if (!self::$metaList) {
            self::$metaList = getMetaTable('Dailyselection@Dailyselection.php');
        }
        return self::$metaList;
    }

    protected static function mustBeSlotGroupHash()
    {
        if (!self::$slotGroupHash) {
            self::$slotGroupHash = array();
            foreach (self::getMetaList() as $meta) {
                $slots = explode("|", $meta['slot']);
                foreach ($slots as $slot) {
                    if (!getXVal(self::$slotGroupHash, $slot)) {
                        self::$slotGroupHash[$slot] = array();
                    }
                    array_push(self::$slotGroupHash[$slot], $meta);
                }
            }
        }
    }

    protected static $slotGroupHash;
    protected static $metaList;

}