<?php

require_once "PicturedTask.php";

class OpenEndedTask extends PicturedTask
{
    public function __construct(array $a = null)
    {
        parent::__construct("openended", $a);

        $this->correct_answer = $a["correct_answer"] ?? [];
        $this->player_answer = $this->player_answer ?? "";
        $this->setMaxMark(1.0);
    }

    public function addCorrectAnswer(string $ca): void {
        $this->correct_answer[] = $ca;
    }

    public function clearCorrectAnswers(): void {
        $this->correct_answer = [];
    }

    public function saveAnswer(mixed $ans): bool
    {
        // collect transformations
        $transform_fns = [];
        foreach ($this->getFlags() as $flag) {
            switch ($flag) {
                case "makeuppercase":
                    $transform_fns[] = "strtoupper";
                    break;
                case "makelowercase":
                    $transform_fns[] = "strtolower";
                    break;
                case "removespaces":
                    $transform_fns[] = fn($str) => str_replace(" ", "", $str);
                    break;
            }
        }

        // run the transformations
        foreach ($transform_fns as $tfn) {
            $ans = $tfn($ans);
        }

        // save the answer
        $this->player_answer = $ans;

        return true;
    }

    public function staticCheck(): void
    {
        $mark = in_array($this->player_answer, $this->correct_answer) ? $this->getMaxMark() : 0.0;
        $this->setMark($mark);
    }

    function toArray(string $mode = "all"): array {
        $a = parent::toArray($mode);
        $a["correct_answer"] = $this->correct_answer;
        return $a;
    }
}