CodeOceanEditorEvaluation = {
    // A list of non-printable characters that are not allowed in the code output.
    // Taken from https://stackoverflow.com/a/69024306
    nonPrintableRegEx: /[\u0000-\u0008\u000B\u000C\u000F-\u001F\u007F-\u009F\u2000-\u200F\u2028-\u202F\u205F-\u206F\u3000\uFEFF]/g,

    /**
     * Scoring-Functions
     */
    scoreCode: function (event) {
        event.preventDefault();
        const cause = $('#assess');
        this.newSentryTransaction(cause, async () => {
            this.stopCode(event);
            this.clearScoringOutput();
            $('#submit').addClass("d-none");

            const submission = await this.createSubmission(cause, null).catch(this.ajaxError.bind(this));
            if (!submission) return;

            this.showSpinner($('#assess'));
            $('#score_div').removeClass('d-none');
            await this.socketScoreCode(submission.id);
        });
    },

    handleScoringResponse: function (results) {
        this.printScoringResults(results);
        var score = _.reduce(results, function (sum, result) {
            return sum + result.score * result.weight;
        }, 0).toFixed(2);
        $('#score').data('score', score);
        this.renderScore();
    },

    printScoringResult: function (result, index) {
        if (result === undefined || result === null) {
            return;
        }

        $('#results').show();
        let card;
        if (result.file_role === 'teacher_defined_linter') {
            card = $('#linter-dummies').children().first().clone();
        } else {
            card = $('#test-dummies').children().first().clone();
        }
        if (card.isPresent()) {
            // the card won't be present if @embed_options[:hide_test_results] == true
            this.populateCard(card, result, index);
            $('#results ul').first().append(card);
        }
    },

    printScoringResults: function (response) {
        response = (Array.isArray(response)) ? response : [response]
        const test_results = response.filter(function(x) {
            if (x === undefined || x === null) {
                return false;
            }
            switch (x.file_role) {
                case 'teacher_defined_test':
                    return true;
                case 'teacher_defined_linter':
                    return true;
                default:
                    return false;
            }
        });

        $('#results ul').first().html('');
        $('.test-count .number').html(test_results.length);
        this.clearOutput();

        _.each(test_results, function (result, index) {
            // based on https://stackoverflow.com/questions/8511281/check-if-a-value-is-an-object-in-javascript
            if (result === Object(result)) {
                this.printOutput(result, false, index);
                this.printScoringResult(result, index);
            }
        }.bind(this));

        if (_.some(response, function (result) {
            return result.status === 'timeout';
        })) {
            this.showTimeoutMessage();
        }
        if (_.some(response, function (result) {
            return result.status === 'out_of_memory';
        })) {
            this.showOutOfMemoryMessage();
        }
        if (_.some(response, function (result) {
            return result.status === 'runner_in_use';
        })) {
            this.showRunnerInUseMessage();
        }
        if (_.some(response, function (result) {
            return result.status === 'container_depleted';
        })) {
            this.showContainerDepletedMessage();
        }
    },

    renderScore: function () {
        var score = parseFloat($('#score').data('score'));
        var maximum_score = parseFloat($('#score').data('maximum-score'));
        if (score >= 0 && score <= maximum_score && maximum_score > 0) {
            var percentage_score = (score / maximum_score * 100).toFixed(0);
            $('.score').html(percentage_score + '%');
        } else {
            $('.score').html(0 + '%');
        }
        this.renderProgressBar(score, maximum_score);
    },

    /**
     * Testing-Logic
     */
    handleTestResponse: function (result) {
        this.clearOutput();
        this.printOutput(result, false, 0);
        this.showStatus(result);
        this.showOutputBar();
    },

    /**
     * Stop-Logic
     */
    stopCode: function (event) {
        event.preventDefault();
        if (this.isActiveFileStoppable() && this.websocket) {
            this.websocket.send(JSON.stringify({'cmd': 'client_kill'}));
            this.killWebsocket();
            this.cleanUpUI();
        }
    },

    killWebsocket: function () {
        if (this.websocket != null && this.websocket.getReadyState() !== WebSocket.OPEN) {
            return;
        }

        this.websocket.killWebSocket();
        this.websocket.onError(_.noop);
        this.running = false;
    },

    cleanUpUI: function () {
        this.hideSpinner();
        this.toggleButtonStates();
        this.hidePrompt();
    },

    /**
     * Output-Logic
     */
    printWebsocketOutput: function (msg) {
        if (!msg.data || msg.data === "\r") {
            return;
        }
        var stream = {};
        stream[msg.stream] = msg.data;
        this.printOutput(stream, true, 0);
    },

    clearOutput: function () {
        $('#output > .output-element').remove();
        CodeOceanEditorTurtle.hideCanvas();
    },

    clearScoringOutput: function () {
        $('#results ul').first().html('');
        $('.test-count .number').html(0);
        $('#score').data('score', 0);
        this.renderScore();
        this.clearOutput();
    },

    printOutput: function (output, colorize, index) {
        if (output === undefined || output === null || output.stderr === undefined && output.stdout === undefined) {
            // Prevent empty element with no text at all
            return;
        }

        const sanitizedStdout = this.sanitizeOutput(output.stdout);
        const sanitizedStderr = this.sanitizeOutput(output.stderr);

        const element = this.findOrCreateOutputElement(index);
        const pre = $('<span>');

        if (sanitizedStdout !== '') {
            if (colorize) {
                pre.addClass('text-success');
            }
            pre.append(sanitizedStdout)
        }

        if (sanitizedStderr !== '') {
            if (colorize) {
                pre.addClass('text-warning');
            } else {
                pre.append('StdErr: ');
            }
            pre.append(sanitizedStderr);
        }

        if (sanitizedStdout === '' && sanitizedStderr === '') {
            if (colorize) {
                pre.addClass('text-body-secondary');
            }
            pre.text($('#output').data('message-no-output'))
        }

        element.append(pre);
    },

    sanitizeOutput: function (rawContent) {
        let sanitizedContent = _.escape(rawContent).replace(this.nonPrintableRegEx, "");

        if (rawContent !== undefined && rawContent.trim().startsWith("<img")) {
            const doc = new DOMParser().parseFromString(rawContent, "text/html");
            // Get the parsed element, it is automatically wrapped in a <html><body> document
            const parsedElement = doc.firstChild.lastChild.firstChild;

            if (parsedElement.src.startsWith("data:image")) {
                const sanitizedImg = document.createElement('img');
                sanitizedImg.src = parsedElement.src;
                sanitizedContent = sanitizedImg.outerHTML;
            }
        }

        return sanitizedContent;
    },

    getDeadlineInformation: function(deadline, translation_key, otherwise) {
        if (deadline !== undefined) {
            let li = document.createElement("li");
            this.submission_deadline = new Date(deadline);
            let deadline_text = I18n.l("time.formats.long", this.submission_deadline);
            deadline_text += ` (${this.getUTCTime(this.submission_deadline, I18n.locale === 'en')})`;
            const bullet_point = I18n.t(`exercises.editor.hints.${translation_key}`,
                { deadline: deadline_text, otherwise: otherwise })
            let text = $.parseHTML(bullet_point);
            $(li).append(text);
            return li;
        }
    },

    getUTCTime: function(d, use_am_pm) {
        let hour = d.getUTCHours();
        const pm = hour >= 12;
        let hour12 = hour % 12;
        if (!hour12) {
            hour12 += 12;
        }
        hour = hour.toLocaleString('en-US', {minimumIntegerDigits: 2, useGrouping: false})
        const minute = d.getUTCMinutes().toLocaleString('en-US', {minimumIntegerDigits: 2, useGrouping: false})
        const second = d.getUTCSeconds().toLocaleString('en-US', {minimumIntegerDigits: 2, useGrouping: false})
        if (use_am_pm) {
            return `${hour12}:${minute}:${second} ${pm ? 'pm' : 'am'} UTC`;
        } else {
            return `${hour}:${minute}:${second} UTC`;
        }
    },

    initializeDeadlines: function () {
        const deadline = $('#deadline');
        if (deadline) {
            const submission_deadline = deadline.data('submission-deadline');
            const late_submission_deadline = deadline.data('late-submission-deadline');

            const ul = document.createElement("ul");

            if (submission_deadline && late_submission_deadline) {
                // i18n-tasks-use t('exercises.editor.hints.submission_deadline')
                ul.append(this.getDeadlineInformation(submission_deadline, 'submission_deadline', ''));
                // i18n-tasks-use t('exercises.editor.hints.late_submission_deadline')
                ul.append(this.getDeadlineInformation(late_submission_deadline, 'late_submission_deadline', ''));
            } else {
                const otherwise_no_points = I18n.t('exercises.editor.hints.otherwise');
                // i18n-tasks-use t('exercises.editor.hints.submission_deadline')
                ul.append(this.getDeadlineInformation(submission_deadline, 'submission_deadline', otherwise_no_points));
            }

            $(ul).insertAfter($(deadline).children()[0]);
        }
    }
};