var voting_widget = (function () {

var exports = {};

var poll_data_holder = function () {
    // This object just holds data for a poll, although it
    // works closely with the widget's concept of how data
    // should be represented for rendering, plus how the
    // server sends us data.
    var self = {};

    var me = people.my_current_user_id();
    var key_to_comment = {};
    var my_idx = 1;

    self.get_widget_data = function () {
        var comments = [];

        _.each(key_to_comment, function (obj, key) {
            var voters = _.keys(obj.votes);

            comments.push({
                comment: obj.comment,
                names: people.safe_full_names(voters),
                count: voters.length,
                key: key,
            });
        });


        var widget_data = {
            comments: comments,
        };

        return widget_data;
    };

    self.handle = {
        new_comment: {
            outbound: function (comment) {
                var event = {
                    type: 'new_comment',
                    idx: my_idx,
                    comment: comment,
                };

                my_idx += 1;

                return event;
            },

            inbound: function (sender_id, data) {
                var idx = data.idx;
                var key = sender_id + ',' + idx;
                var comment = data.comment;
                var votes = {};

                votes[sender_id] = 1;

                key_to_comment[key] = {
                    comment: comment,
                    user_id: sender_id,
                    votes: votes,
                };

                if (my_idx <= idx) {
                    my_idx = idx + 1;
                }
            },
        },

        vote: {
            outbound: function (key) {
                var vote = 1;

                // toggle
                if (key_to_comment[key].votes[me]) {
                    vote = -1;
                }

                var event = {
                    type: 'vote',
                    key: key,
                    vote: vote,
                };

                return event;
            },

            inbound: function (sender_id, data) {
                var key = data.key;
                var vote = data.vote;
                var comment = key_to_comment[key];

                if (comment === undefined) {
                    blueslip.error('unknown key for poll: ' + key);
                    return;
                }

                var votes = comment.votes;

                if (vote === 1) {
                    votes[sender_id] = 1;
                } else {
                    delete votes[sender_id];
                }
            },
        },
    };

    self.handle_event = function (sender_id, data) {
        var type = data.type;
        if (self.handle[type]) {
            self.handle[type].inbound(sender_id, data);
        }
    };

    return self;
};

exports.activate = function (opts) {
    var self = {};

    var elem = opts.elem;
    var callback = opts.callback;

    var poll_data = poll_data_holder();

    function render() {
        var html = templates.render('poll-widget');
        elem.html(html);

        elem.find("button.poll-comment").on('click', function (e) {
            e.stopPropagation();
            var comment = elem.find("input.poll-comment").val().trim();

            if (comment === '') {
                return;
            }

            elem.find(".poll-comment").val('').focus();

            var data = poll_data.handle.new_comment.outbound(comment);
            callback(data);
        });
    }

    function render_results() {
        var widget_data = poll_data.get_widget_data();
        var html = templates.render('poll-widget-results', widget_data);
        elem.find('ul.poll-widget').html(html);

        elem.find("button.poll-vote").on('click', function (e) {
            e.stopPropagation();
            var key = $(e.target).attr('data-key');

            var data = poll_data.handle.vote.outbound(key);
            callback(data);
        });
    }

    self.handle_events = function (events) {
        _.each(events, function (event) {
            poll_data.handle_event(event.sender_id, event.data);
        });
        render_results();
    };

    render();
    render_results();

    return self;
};

return exports;

}());
if (typeof module !== 'undefined') {
    module.exports = voting_widget;
}