<?php

class UOJContestProblem extends UOJProblem {
	public $contest = null;
	public $problem_number = -1;

	public static function query($id, UOJContest $contest = null) {
		$problem = parent::query($id);
		if ($problem === null) {
			return $problem;
		}
		if ($contest === null) {
			$contest = UOJContest::cur();
		}
		return new UOJContestProblem($problem->info, $contest);
	}

	public function __construct($info, UOJContest $contest) {
		parent::__construct($info);
		$this->contest = $contest;
	}

	public function valid() {
		return $this->contest && $this->contest->hasProblem($this);
	}

	public function getProblemNumber() {
		if ($this->problem_number !== -1) {
			return $this->problem_number;
		}
		$contest_problems = DB::selectAll([
			DB::lc(), "select problem_id from contests_problems",
			"where", [
				'contest_id' => $this->contest->info['id'],
			],
			"order by level, problem_id"
		]);
		return $this->problem_number = array_search(['problem_id' => $this->info['id']], $contest_problems);
	}

	public function getLetter() {
		$num = $this->getProblemNumber();
		if ($num === null) {
			return null;
		}
		return chr(ord('A') + $num);
	}

	public function getTitle(array $cfg = []) {
		$cfg += [
			'with' => 'id',
			'simplify' => false
		];
		$title = parent::getTitle(['with' => null] + $cfg);
		if ($cfg['simplify']) {
			$letter = $this->getLetter();
			if (strStartWith($title, $letter)) {
				if (strStartWith($title, $letter . '.')) {
					$title = substr($title, strlen($letter) + 1);
				} else if (strStartWith($title, $letter . ' - ')) {
					$title = substr($title, strlen($letter) + 3);
				}
				$title = trim($title);
			}
		}
		if ($cfg['with'] == 'letter') {
			if (!isset($letter)) {
				$letter = $this->getLetter();
			}
			return "{$letter}. {$title}";
		} elseif ($cfg['with'] == 'id') {
			return "#{$this->info['id']}. {$title}";
		} else {
			return $title;
		}
	}

	public function getUri($where = '') {
		if (!$this->contest) {
			return false;
		}
		return "/contest/{$this->contest->info['id']}/problem/{$this->info['id']}{$where}";
	}

	public function queryUserSubmissionCountInContest(array $user = null) {
		if (!$user) {
			return 0;
		}
		return DB::selectCount([
			DB::lc(), "select count(*) from submissions",
			"where", [
				"submitter" => $user['username'],
				"problem_id" => $this->info['id'],
				"contest_id" => $this->contest->info['id'],
				DB::lor([
					[UOJSubmission::sqlForActualScore(), "is not", null],
					['status', 'not like', 'Judged%']
				])
			]
		]);
	}

	public function getJudgeTypeInContest() {
		if (!isset($this->contest->info['extra_config']["problem_{$this->info['id']}"])) {
			return $this->contest->defaultProblemJudgeType();
		} else {
			return $this->contest->info['extra_config']["problem_{$this->info['id']}"];
		}
	}

	public function isBonus() {
		return isset($this->contest->info['extra_config']['bonus']["problem_{$this->info['id']}"]);
	}

	public function submitTimeLimit() {
		if (isset($this->contest->info['extra_config']['submit_time_limit']["problem_{$this->info['id']}"])) {
			return $this->contest->info['extra_config']['submit_time_limit']["problem_{$this->info['id']}"];
		} else {
			return -1;
		}
	}

	public function userCanClickZan(array $user = null) {
		return $this->userCanView($user) && $this->contest->progress() > CONTEST_IN_PROGRESS;
	}

	public function userCanView(array $user = null, array $cfg = []) {
		$cfg += ['check-register' => true];
		return $this->contest->userCanView($user, $cfg);
	}

	public function userCanDownloadAttachments(array $user = null) {
		return $this->userCanView($user);
	}

	public function preHackCheck(array $user = null) {
		return $this->info['hackable'] && !$this->info['is_hidden'];
	}

	public function preSubmitCheck() {
		if ($this->contest->userCanManage(Auth::user())) {
			return true;
		}
		if ($this->contest->progress() > CONTEST_IN_PROGRESS && !parent::userCanView(Auth::user())) {
			return '比赛已结束，请耐心等待管理员在题库公开题目后再提交哦～';
		}
		return true;
	}

	public function additionalSubmissionComponentsCannotBeSeenByUser(array $user = null, UOJSubmission $submission) {
		// excluding manager_view, score; don't check whether $user is a manager
		if ($this->contest->progress() == CONTEST_IN_PROGRESS) {
			if ($submission->userIsSubmitter($user)) {
				if ($this->getJudgeTypeInContest() == 'no-details') {
					return ['low_level_details'];
				} else {
					return [];
				}
			} else {
				return ['content', 'high_level_details', 'low_level_details'];
			}
		} else {
			return [];
		}
	}
}