<?php

namespace refill;

use Log;

class overload_assigner
{
    private $mCtlItems;
    public function __construct()
    {
        $this->mCtlItems = [];
    }

    public function add($ctls)
    {
        foreach ($ctls as $item) {
            $name = $item->name();
            $max_speed = $item->max_speed();
            if($max_speed > 0) {
                $this->mCtlItems[$name] = $item;
            }
        }
    }

    public function assign()
    {
        $pCtlItems = $this->mCtlItems;
        if(empty($pCtlItems)) return [];

        $namesor = function ($ctls)
        {
            $result = [];
            foreach ($ctls as $item) {
                $result[] = $item->name();
            }
            return $result;
        };

        $ctlsor = function ($names) use ($pCtlItems)
        {
            $result = [];
            foreach ($names as $name) {
                $result[] = $pCtlItems[$name];
            }
            return $result;
        };

        $elector = function ($none_names) use ($pCtlItems)
        {
            $sections = [];
            $total = 0;
            foreach ($none_names as $name)
            {
                $ctl_item = $pCtlItems[$name];
                $length = $ctl_item->max_speed();
                $total += $length;
                $sections[] = ['name' => $name,'length' => $length];
            }

            $anchor = mt_rand(1,$total);
            foreach ($sections as $section)
            {
                $name = $section['name'];
                $length = $section['length'];

                if($anchor > $length) {
                    $anchor -= $length;
                }
                else {
                    return $name;
                }
            }
        };

        $using_names = [];
        $all_names = $namesor($this->mCtlItems);

        do {
            $none_assign = array_diff($all_names,$using_names);
            if(count($none_assign) <= 1) {
                $using_names = array_merge($using_names,$none_assign);
                break;
            }
            else
            {
                $hit_name = $elector($none_assign);
                $using_names[] = $hit_name;
            }

        } while(true);

        Log::record("overload_assigner result= ". implode(',',$using_names),Log::DEBUG);
        return $ctlsor($using_names);
    }
}