<?php

require_once "TaskFactory.php";

require_once "TestSummary.php";

class Test extends AutoStoring
{
    const TEST_ONGOING = "ongoing";
    const TEST_CONCLUDED = "concluded";

    // ---------

    public int $id; // ID
    public int $gameId; // ID of associated game
    public string $gameName; // Name of the associated game
    public string $nickname; // Associated user's nickname
    public string $state; // State of the test (ongoing/concluded)
    public bool $timeLimited; // The user is allowed to submit the test in a given period of time.
    public bool $repeatable; // Is the user allowed to take this test multiple times?
    public int $startTime; // Start time (UNIX timestamp)
    public int $endTime; // End time (UNIX timestamp)
    public int $endLimitTime; // Time limit on test submission (UNIX timestamp)
    public TestSummary $summary; // Summmary, if game has ended
    public array $tasks; // Test tasks

    private TestMgr $testMgr; // Reference to TestMgr managing this Test instance

    // -------------

    // Preprocess tasks.
    private function preprocessTasks(): void
    {
        foreach ($this->tasks as &$task) {
            $task->setTemplate(false); // the task is no longer a template
            $task->randomize(); // randomize
        }
    }

    // -------------

    function getMaxSumMark(): float
    {
        $msm = 0.0;
        foreach ($this->tasks as &$task) {
            $msm += $task->getMaxMark();
        }
        return $msm;
    }

    // -------------

    // Store modifications.
    public function storeMods(): void
    {
        $this->testMgr->updateTest($this);
    }

    // -------------

    // Construct new test based on Game and User objects
    function __construct(TestMgr &$testMgr, Game|array &$game_array, User &$user = null)
    {
        parent::__construct();

        $this->testMgr = $testMgr;
        $this->id = -1;

        if (is_array($game_array)) { // populating fields from an array
            $a = &$game_array;

            $this->id = $a["_id"] ?? -1;
            $this->gameId = $a["gameid"];
            $this->gameName = $a["gamename"];
            $this->nickname = $a["nickname"];
            $this->state = $a["state"];
            $this->timeLimited = $a["time_limited"];
            $this->startTime = $a["start_time"];
            $this->endTime = $a["end_time"] ?? 0;
            $this->endLimitTime = $a["end_limit_time"] ?? 0;
            $this->repeatable = $a["repeatable"];
            $this->tasks = TaskFactory::constructFromCollection($a["challenges"]);
            if (isset($a["summary"])) {
                $this->summary = TestSummary::fromArray($a["summary"]);
            } else { // backward compatibility
                $this->summary = new TestSummary($this->getMaxSumMark(), 0);
            }
        } else { // populating fields from Game and User objects
            $game = &$game_array;

            $this->endTime = 0;

            // Fill-in basic properties
            $this->gameId = $game->getId();
            $this->gameName = $game->getName();
            $this->tasks = $game->getTasks();
            $this->preprocessTasks();
            $this->nickname = $user->getNickname();

            $this->state = self::TEST_ONGOING;
            $gp = $game->getProperties();
            $this->timeLimited = (($gp["time_limit"] ?: -1) > -1);

            $now = time();
            $this->startTime = $now;
            if ($this->timeLimited) {
                $this->endLimitTime = $now + $gp["time_limit"];
            } else {
                $this->endLimitTime = -1; // dummy value, not used, since timeLimited is false
            }

            $this->repeatable = $gp["repeatable"];

            // Create a blank summary
            $this->summary = new TestSummary($this->getMaxSumMark(), 0);
        }

        // auto-conclude time-constrained test if expired
        if ($this->timeLimited && $this->isOngoing() && ($this->endLimitTime <= time())) {
            $this->concludeTest();
            $this->endTime = $this->endLimitTime; // date back end time to the limiting value
        }
    }

    // Convert test to array.
    function toArray(array $omit = []): array
    {
        $tasks = [];
        foreach ($this->tasks as &$t) {
            $tasks[] = $t->toArray();
        }

        $a = [
            "_id" => $this->id,
            "gameid" => $this->gameId,
            "nickname" => $this->nickname,
            "gamename" => $this->gameName,
            "state" => $this->state,
            "time_limited" => $this->timeLimited,
            "start_time" => $this->startTime,
            "end_time" => $this->endTime,
            "end_limit_time" => $this->endLimitTime,
            "repeatable" => $this->repeatable,
            "challenges" => $tasks,
            "summary" => $this->summary->toArray()
        ];

        // omit specific fields
        foreach ($omit as $field) {
            unset($a[$field]);
        }

        return $a;
    }

    // Get number of tasks.
    function getTaskCount(): int
    {
        return count($this->tasks);
    }

    function isTaskIdInsideBounds(int $tidx): bool {
        return ($tidx >= 0) && ($tidx < $this->getTaskCount());
    }

    // Save answer. Asserting $safe prevents saving answers to a concluded test.
    function saveAnswer(int $tidx, int|string $ans, bool $safe = true): bool
    {
        if (!$safe || $this->state === self::TEST_ONGOING) {
            if ($this->isTaskIdInsideBounds($tidx)) {
                $this->tasks[$tidx]->saveAnswer($ans);
                $this->commitMods();
                return true;
            }
        }
        return false;
    }

    // Clear answer.
    function clearAnswer(int $chidx, bool $safe = true): bool
    {
        if (!$safe || $this->state === self::TEST_ONGOING) {
            if ($this->isTaskIdInsideBounds($chidx)) {
                $this->tasks[$chidx]->clearAnswer();
                $this->commitMods();
                return true;
            }
        }
        return false;
    }

    // Conclude test.
    function concludeTest(): void
    {
        // summarize points
        $mark_sum = 0.0;
        foreach ($this->tasks as &$ch) {
            $mark_sum += $ch->getMark();
        }

        // set state and fill summary
        $this->state = self::TEST_CONCLUDED;
        $this->endTime = time();
        $this->summary->setMark($mark_sum);

        // save test
        $this->commitMods();
    }

    // --------

    public function getId(): int
    {
        return $this->id;
    }

    public function getStartTime(): int
    {
        return $this->startTime;
    }

    public function getEndTime(): int
    {
        return $this->endTime;
    }

    public function getSummary(): TestSummary
    {
        return $this->summary;
    }

    public function getNickname(): string
    {
        return $this->nickname;
    }

    public function getGameId(): int
    {
        return $this->gameId;
    }

    public function isConcluded(): bool
    {
        return $this->state === self::TEST_CONCLUDED;
    }

    public function isOngoing(): bool
    {
        return $this->state === self::TEST_ONGOING;
    }
}