<?php

class BookSelectionController{

    private $books;
    private $difficulty;
    private $rules = array();

    public function __construct(array $books){
        $this->books = $books;
    }

    public function setDifficulty($diff){
        $this->difficulty = $diff;
    }

    private function getRules(){
        $manager = new FileDBManager();
        $db = $manager->table("pickrules");
        $pickrules = $db->select(array("difficulty"=>$this->difficulty));
        while($pickrule = $pickrules->getRow()){
            $rule = $pickrule->getArray();
            $rule['count'] = 0;
            $rule['ok'] = false;
            $rules[$pickrule->parent_id][$rule['id']] = $this->getRuleText($rule);
        }
        $this->rules = $rules;
    }

    private function getRuleText($rule){
        foreach($this->books as $section){
            foreach($section as $book){
                if($book[$rule['attribute']] == $rule['value'] and array_key_exists($rule['text'],$book)){
                    $rule['text'] = $book[$rule['text']];
                    return $rule;
                }
            }
        }
        return $rule;
    }

    public function countMissing(){
        $this->getRules();
        $result = $this->execRules($this->rules,$this->books,0);
        return $this->rules = $result['rules'];
    }

    private function execRules($rules,$books,$parent){
        $result['result'] = true;
        foreach($rules[$parent] as $rule_id => $rule){
            foreach($books as $section){
                foreach($section as $book){
                    if(array_key_exists($rule['attribute'],$book)){
                        if($book['marked'] == true and $book[$rule['attribute']] == $rule['value']){
                            $rules[$parent][$rule_id]['count']++;
                            $books_passed[$book['section_name']][] = $book;
                        }elseif($book['marked'] == true and $rule['value'] == 'count'){
                            $count[$book[$rule['attribute']]] = true;
                        }
                    }
                }
            }
            if(isset($count) and $rule['value'] == 'count'){
                $rules[$parent][$rule_id]['count'] =  count($count);
            }
            if($rules[$parent][$rule_id]['count'] >= $rules[$parent][$rule_id]['number']){
                $rules[$parent][$rule_id]['ok'] = true;
            }else{
                $result['result'] = false;
            }
            if(isset($books_passed) and array_key_exists($rule['id'],$rules)){
                $child_result = $this->execRules($rules,$books_passed,$rule['id']);
                $rules = $child_result['rules'];
                $rules[$parent][$rule_id]['ok'] = $child_result['result'];
            }
        }
        $result['rules'] = $rules;
        return  $result;
    }

    public function checkPassed(){
        foreach($this->rules[0] as $rule){
            if($rule['ok'] != true) return false;
        }
        return true;
    }

}

?>