/**
 * Created by robert on 9/17/15.
 */

(function(){
    var loginFun = function(){
        var identifier = $('#problem_group').val().split('/'),
            problem = $('#problems').val();
        if (identifier.length < 2) alert('Choose a problem group');
        else if (!problem) alert('Choose a problem');
        else {
            $('#disabled').css('display', '');
            codeq.comms.login($('#username').val(), $('#password').val())
                .then(function (data) {
                    $('#disabled').css('display', 'none');
                    if (data.code !== 0) throw new Error('Login failed, code: ' + data.code + ', message: ' + data.message);
                })
                .then(function () {
                    return codeq.comms.getProblem(identifier[0], identifier[1], problem);
                })
                .then(function (data) {
                    if (data.code !== 0) throw new Error('Failed to obtain problem data, code: ' + data.code + ', message: ' + data.message);
                    $('#disabled').css('display', 'none');
                    switch (identifier[0]) {
                        case 'prolog':
                            // TODO: assignment to window for debug only
                            //$('#screen_login').css('display', 'none');
                            //$('#screen_prolog').css('display', '');
                            codeq.globalStateMachine.transition('prolog', data);
                            //window.phandler = codeq.createProgrammingLanguageHandler('prolog',data.data,codeq.makePrologTerminalHandler);//codeq.createPrologHandler(data.data);
                            break;
                        case 'python':
                            // TODO: assignment to window for debug only
                            //$('#screen_login').css('display', 'none');
                            //$('#screen_prolog').css('display', '');
                            codeq.globalStateMachine.transition('python', data);
                            //window.phandler = codeq.createProgrammingLanguageHandler('python',data.data,codeq.makePythonTerminalHandler);//codeq.createPythonHandler(data.data);
                            break;
                        default:
                            alert('Unknown language: ' + identifier[0]);
                            break;
                    }
                })
                .fail(function (reason) {
                    $('#disabled').css('display', 'none');
                    alert('Login request failed: ' + reason);
                })
                .done();
        }
    };
    codeq.globalStateMachine.register('login',{
        'enter': function(){
            codeq.comms.connect().then(function () {
                return codeq.comms.send({'action': 'list_problems'});//currently problem list and the actual login are still in the same state
            }).then(
                function success(data) {
                    var i, groups, group, problems, problem, first_group,
                        jqGroup = $('#problem_group'),
                        jqProblems = $('#problems'),
                        html = [],
                        mapping = {},
                        onGroupChange = function () {
                            var problems = mapping[jqGroup.val()],
                                html = [],
                                i, p;
                            if (problems) {
                                for (i = 0; i < problems.length; i++) {
                                    p = problems[i];
                                    html.push('<option value="', p.identifier, '">', p.name, '</option>\n')
                                }
                            }
                            jqProblems.html(html.join(''));
                        };

                    if (data && (data.code === 0)) {
                        $('#disabled').css('display', 'none');
                        groups = data.problems;
                        for (i = 0; i < groups.length; i++) {
                            group = groups[i];
                            var identifier = group.identifier.language + '/' + group.identifier.group;
                            var name = group.name.language + ': ' + group.name.group;
                            html.push('<option value="', identifier, '">', name, '</option>\n');
                            mapping[identifier] = group.problems;
                        }
                        jqGroup.html(html.join(''));
                        first_group = html[1];
                        html = null;

                        jqGroup.on('click', onGroupChange);
                        jqGroup.val(first_group);
                        onGroupChange();

                        $("#submit").on('click', loginFun);
                    }
                    else {
                        $('#disabled').css('cursor', '');
                        alert('Obtaining list of problems failed: code=' + data.code + ', reason=' + data.message);
                    }
                },

                function failure(reason) {
                    $('#disabled').css('cursor', '');
                    alert('Request to obtain list of problems failed: ' + reason);
                }
            ).done();
        },
        'exit' : function(){
            $("#submit").off('click', loginFun);
            $("#screen_login").css('display', 'none');
        }
    });
})();