{% include 'partials/javascript_language_detect.html.twig' %}
<script>
    function entryPointDetectJava(filename) {
        return filename.replace(/\.[^\.]*$/, '');
    }

    function entryPointDetectKt(filename) {
        var filebase = filename.replace(/\.[^\.]*$/, '');
        if (filebase === '') return '_Kt';

        filebase = filebase.replace(/[^a-zA-Z0-9]/, '_');
        if (filebase.charAt(0).match(/^[a-zA-Z]$/)) {
            return filebase.charAt(0).toUpperCase() + filebase.slice(1) + 'Kt';
        } else {
            return '_' + filebase + 'Kt';
        }
    }

    function maybeShowEntryPoint(filename) {
        var langid = $('#submit_problem_language').val();
        if (langid === "") {
            return;
        }
        var $entryPoint = $('[data-entry-point]');
        var $entryPointLabel = $entryPoint.find('label');
        var $entryPointInput = $entryPoint.find('input');
        var entryPointDescription = getEntryPoint(langid);
        if (entryPointDescription) {
            $entryPoint.show();
        } else {
            $entryPoint.hide();
        }

        if (entryPointDescription) {
            var $labelChildren = $entryPointLabel.children();
            $entryPointLabel.text(entryPointDescription).append($labelChildren);
            $entryPointInput.attr('required', 'required');
        } else {
            $entryPointInput.attr('required', null);
        }

        if (entryPointDescription && filename) {
            switch (langid) {
                case 'java':
                    $entryPointInput.val(entryPointDetectJava(filename));
                    break;
                case 'kt':
                    $entryPointInput.val(entryPointDetectKt(filename));
                    break;
                default:
                    $entryPointInput.val(filename);
            }
        } else {
            $entryPointInput.val('');
        }
    }

    $(function () {
        var $entryPoint = $('[data-entry-point]');
        $entryPoint.hide();

        var processFile = function () {
            var filename = $('#submit_problem_code').val();
            if (filename !== '' && filename !== undefined) {
                filename = filename.replace(/^.*[\\\/]/, '');
                var parts = filename.split('.').reverse();
                if (parts.length < 2) return;
                var lcParts = [parts[0].toLowerCase(), parts[1].toLowerCase()];

                // language ID

                var language = document.getElementById('submit_problem_language');
                // the "autodetect" option has empty value
                if (language.value !== '') return;

                var langid = getMainExtension(lcParts[0]);
                for (i = 0; i < language.length; i++) {
                    if (language.options[i].value === langid) {
                        language.selectedIndex = i;
                    }
                }

                maybeShowEntryPoint(filename);

                // Problem ID

                var problem = document.getElementById('submit_problem_problem');
                // the "autodetect" option has empty value
                if (problem.value !== '') {
                    return;
                }

                for (var i = 0; i < problem.length; i++) {
                    if (problem.options[i].text.split(/ - /)[0].toLowerCase() === lcParts[1]) {
                        problem.selectedIndex = i;
                    }
                }
            }
        };

        var $body = $('body');
        $body.on('change', '#submit_problem_code', processFile);
        $body.on('change', '#submit_problem_language', function () {
            maybeShowEntryPoint();
        });

        $body.on('submit', 'form[name=submit_problem]', function () {
            var langelt = document.getElementById("submit_problem_language");
            var language = langelt.options[langelt.selectedIndex].value;
            var languagetxt = langelt.options[langelt.selectedIndex].text;
            var fileelt = document.getElementById("submit_problem_code");
            var filenames = fileelt.files;
            var filename = filenames[0].name;
            var probelt = document.getElementById("submit_problem_problem");
            var problem = probelt.options[probelt.selectedIndex].value;
            var problemtxt = probelt.options[probelt.selectedIndex].text;

            var error = false;
            if (language === "") {
                langelt.focus();
                langelt.className = langelt.className + " errorfield";
                error = true;
            }
            if (problem === "") {
                probelt.focus();
                probelt.className = probelt.className + " errorfield";
                error = true;
            }
            if (filename === "") {
                error = true;
            }
            if (error) return false;

            var auxfileno = 0;
            // start at one; skip maincode file field
            for (var i = 1; i < filenames.length; i++) {
                if (filenames[i].value !== "") {
                    auxfileno++;
                }
            }
            var extrafiles = '';
            if (auxfileno > 0) {
                extrafiles = "Additional source files: " + auxfileno + '\n';
            }
            var question =
                'Main source file: ' + filename + '\n' +
                extrafiles + '\n' +
                'Problem: ' + problemtxt + '\n' +
                'Language: ' + languagetxt + '\n' +
                '\nMake submission?';
            return confirm(question);
        });

        processFile();
        maybeShowEntryPoint();

        window.initSubmitModal = function ($elem) {
            $('[data-entry-point]').hide();
        };
    });
</script>