<?php

require_once "LogicTaskBase.php";

class LogicFunctionTask extends LogicTaskBase
{
    private float $missing_minterm_score = -1.0; // score for a missing minterm
    public function __construct(array $a = null)
    {
        parent::__construct("logicfunction", $a);

        $this->missing_minterm_score = $a["missing_minterm_score"] ?? -1.0;

        if (!$this->hasFlag("dnf")) {
            $this->setCorrectAnswer($this->getLogicFunction()->getExpression());
        } else {
            $dnf = $this->getLogicFunction()->toDNF();
            if ($dnf === "") {
                $dnf = "0";
            }
            $this->setCorrectAnswer($dnf);
        }
    }

    public function toArray(string $mode = "all"): array
    {
        $a = parent::toArray($mode);

        if ($this->hasFlag("attachtruthtable")) {
            $a["truthtable"] = $this->getTruthtable();
        }

        if ($mode == "all") {
            $a["missing_minterm_score"] = $this->missing_minterm_score;
        }

        return $a;
    }

    public function getMissingMintermScore(): float
    {
        return $this->missing_minterm_score;
    }

    public function setMissingMintermScore(float $missing_minterm_score): void
    {
        $this->missing_minterm_score = $missing_minterm_score;
    }

    protected function staticCheck(): void
    {
        $mark = 0.0;
        $pa = $this->player_answer ?? "";
        $iv = $this->getLogicFunction()->getInputVars();
        $palf = new LogicFunction($pa, $iv);
        if ($palf->isValid() && ((!$this->hasFlag("dnf")) || LogicFunction::isCorrectDNF($iv, $pa))) { // if the function is valid AND (if enabled) it is a correct DNF
            $patt = $palf->getTruthTable();
            $errs = $this->getTTDiffCntToCA($patt);
            $mark = $this->getMaxMark() + $errs * $this->getMissingMintermScore();
        }
        $this->setMark($mark);
    }
}