function changed_name() {
    var username = localStorage.getItem("c3-rating-user");
    var newname = document.getElementById('Username').value;
    document.getElementById('Username').classList.toggle('changed', username != newname);
}

function changed_filter() {
    var filtertext = document.getElementById('Filter').value.toLowerCase();
    if (filtertext == '') {
        document.querySelectorAll('.event-list-item.filtered').forEach(function(ev) {
            ev.classList.remove("filtered");
        });
        return;
    }

    if (!window.inner_texts) {
        window.inner_texts = {};
        document.querySelectorAll('.event-list-item').forEach(function(ev) {
            inner_texts[ev.getAttribute('id')] = ev.innerText.toLowerCase();
        });
    }

    Object.keys(window.inner_texts).forEach(function (eid) {
        var elem = document.getElementById(eid);
        elem.classList.toggle('filtered', window.inner_texts[eid].indexOf(filtertext) < 0);
    });
}

function confirm_name() {
    localStorage.setItem("c3-rating-user", document.getElementById('Username').value);
    document.getElementById('Username').classList.remove("changed");
    update_status();
}

function toggleHidden(name) {
    document.getElementById(name).classList.toggle("hidden");
}

function toggleEdit(eid) {
    var username = document.getElementById('Username').value;
    if (!username) {
        alert( "Please set your name before rating.");
        return;
    }

    var ev = document.getElementById('event-'+eid);
    if (ev.classList.contains('editing')) {
        ev.classList.toggle('editing', false);
        return;
    }

    var other_in_edit = document.getElementsByClassName('editing');
    if (other_in_edit.length)
        other_in_edit[0].classList.remove('editing');

    ev.classList.toggle('editing', true);

    var own_rating = document.getElementById('event-own-rating');
    ev.appendChild(own_rating);

    var myrating = document.querySelectorAll('div#event-rating-'+eid+'[submitter="'+username+'"]');
    var mycomment = '';
    if (myrating.length) {
        mycomment = myrating[0].getElementsByClassName('event-rating-comment')[0].innerHTML;
        myrating[0].querySelectorAll('meter').forEach(function(meter) {
            var category = meter.getAttribute('category');
            document.querySelectorAll('#event-own-rating .slider input[category='+category+']')[0].value = meter.value;
            changeVal('event-'+category+'-output', meter.value);
        });
    } else {
        document.querySelectorAll('#event-own-rating .slider input').forEach(function(sl) {
            sl.value = 0;
            var category = sl.getAttribute('category');
            changeVal('event-'+category+'-output', '0');
        });
    }
    document.getElementById('event-comment').value = mycomment;
    own_rating.querySelectorAll('button.remove-rating')[0].classList.toggle('hidden', !myrating.length);
}

function changeVal(el, value) {
    document.getElementById(el).innerHTML = value.toString() + " %";
}

function twocol() {
  document.body.classList.toggle('two-column');
  document.body.classList.remove('three-column');
  document.body.classList.remove('four-column');
}
function threecol() {
  document.body.classList.remove('two-column');
  document.body.classList.toggle('three-column');
  document.body.classList.remove('four-column');
}
function fourcol() {
  document.body.classList.remove('two-column');
  document.body.classList.remove('three-column');
  document.body.classList.toggle('four-column');
}

function invert_sort() {
    var evl = document.getElementById('event-list');
    var nodes = Array.prototype.slice.call(evl.getElementsByClassName('event-list-item')).reverse().forEach(function(el) {
        evl.appendChild(el);
   });
}

function sort_by(order_function) {
    var evl = document.getElementById('event-list');
    Array.prototype.slice.call(evl.getElementsByClassName('event-list-item')).sort(order_function).forEach(function(el) {
        evl.appendChild(el);
   });
}

function myrating_count_sort(elem1, elem2) {
    var username = document.getElementById('Username').value;
    return elem2.querySelectorAll('.event-rating[submitter="'+username+'"]').length - elem1.querySelectorAll('.event-rating[submitter="'+username+'"]').length;
}

function random_sort(elem1, elem2) { return !!Math.floor(Math.random() * 2) ? -1 : 1; }
function rating_count_sort(elem1, elem2) { return elem2.querySelectorAll('.event-rating').length - elem1.querySelectorAll('.event-rating').length; }
function rating_1_sort(elem1, elem2) { return elem2.getElementsByClassName('meter-0')[0].getAttribute('value') - elem1.getElementsByClassName('meter-0')[0].getAttribute('value'); }
function rating_2_sort(elem1, elem2) { return elem2.getElementsByClassName('meter-1')[0].getAttribute('value') - elem1.getElementsByClassName('meter-1')[0].getAttribute('value'); }
function rating_3_sort(elem1, elem2) { return elem2.getElementsByClassName('meter-2')[0].getAttribute('value') - elem1.getElementsByClassName('meter-2')[0].getAttribute('value'); }
function rating_4_sort(elem1, elem2) { return elem2.getElementsByClassName('meter-3')[0].getAttribute('value') - elem1.getElementsByClassName('meter-3')[0].getAttribute('value'); }
function rating_5_sort(elem1, elem2) { return elem2.getElementsByClassName('meter-4')[0].getAttribute('value') - elem1.getElementsByClassName('meter-4')[0].getAttribute('value'); }
function coordinator_sort(elem1, elem2) { return get_coordinator(elem1).localeCompare(get_coordinator(elem2)); }
function state_sort(elem1, elem2) { return elem2.getAttribute('event_state').localeCompare(elem1.getAttribute('event_state')); }

function get_coordinator(elem) {
    var coordinator = elem.getElementsByClassName('event-coordinator');
    if (coordinator.length)
        return coordinator[0].getAttribute('coordinator');
    return '';
}

function do_remove_rating() {
    if (confirm('are you sure?') == false)
        return;

    var in_edit = document.getElementsByClassName('editing');
    if (!in_edit.length)
        return;
    var eid = in_edit[0].getAttribute('id').replace(/^event-/, '');

    var xhttp = new XMLHttpRequest();
    xhttp.open("POST", "api/remove_rating/"+eid, true);
    xhttp.setRequestHeader("Content-type", "application/json");

    var username = document.getElementById('Username').value;

    xhttp.onreadystatechange = function() {
        if (xhttp.readyState == XMLHttpRequest.DONE && xhttp.status == 200) {
            var myrating = document.querySelectorAll('div#event-rating-'+eid+'[submitter="'+username+'"]');
            if(myrating.length)
                myrating[0].parentNode.removeChild(myrating[0]);
            toggleEdit(eid);
            update_status();
        }
    }
    xhttp.send( JSON.stringify( { 'author': username } ) );
}

function do_remove_event(eid) {
    var ev = document.getElementById('event-'+eid);
    var xhttp = new XMLHttpRequest();
    xhttp.open("POST", "api/remove_event/"+eid, true);
    xhttp.setRequestHeader("Content-type", "application/json");
    xhttp.onreadystatechange = function() {
        if (xhttp.readyState == XMLHttpRequest.DONE && xhttp.status == 200) {
            ev.parentNode.removeChild(ev);
        }
    }
    xhttp.send();
}

function do_rate() {
    var in_edit = document.getElementsByClassName('editing');
    if (!in_edit.length)
        return;
    var eid = in_edit[0].getAttribute('id').replace(/^event-/, '');

    var username = document.getElementById('Username').value;
    if (!username) {
      alert( "Please set your name before rating.");
      return;
    }

    var xhttp = new XMLHttpRequest();
    xhttp.open("POST", "api/add_rating/"+eid, true);
    xhttp.setRequestHeader("Content-type", "application/json");

    ratings = {};
    document.getElementById('event-own-rating').querySelectorAll('.category-slider input').forEach(function(ev) {
        ratings[ev.getAttribute("category")] = ev.value;
    });
    var comment = document.getElementById('event-comment').value;

    xhttp.onreadystatechange = function() {
        if (xhttp.readyState == XMLHttpRequest.DONE && xhttp.status == 200) {
            var myrating = document.querySelectorAll('div#event-rating-'+eid+'[submitter="'+username+'"]');
            if (myrating.length) {
                myrating = myrating[0];
            } else {
                myrating = document.getElementById('event-rating-new').cloneNode(true);
                myrating.setAttribute('id', 'event-rating-'+eid);
                myrating.classList.remove('hidden');
                myrating.setAttribute('submitter', username);
                myrating.getElementsByClassName('event-rating-submitter')[0].innerHTML = username + ':';
                document.querySelectorAll('#event-'+eid+' .event-ratings')[0].append(myrating);
            }
            myrating.getElementsByClassName('event-rating-comment')[0].innerHTML = comment;
            for (category in ratings) {
                myrating.querySelectorAll('meter[category='+category+']')[0].value = ratings[category];
                myrating.querySelectorAll('.event-rating-category-output[category='+category+']')[0].innerHTML = ' ' + categories[category] + ' ' + ratings[category] + ' %';
            }

            toggleEdit(eid);
            update_status();
        }
    }

    xhttp.send( JSON.stringify( {
        'author': username,
        'comment': comment,
        'ratings': ratings
    } ) );
}

function do_set_state(eid, state) {
    if ( state == document.getElementById('event-'+eid).getAttribute('event_state'))
        state = '';

    var xhttp = new XMLHttpRequest();
    xhttp.open("POST", "api/set_event_state/"+eid, true);
    xhttp.setRequestHeader("Content-type", "application/json");
    xhttp.onreadystatechange = function() {
        if (xhttp.readyState == XMLHttpRequest.DONE && xhttp.status == 200) {
            document.getElementById('event-'+eid).setAttribute('event_state', state);
            update_status();
        }
    }
    xhttp.send( JSON.stringify( { 'state': state } ) );
}

function do_take(eid) {
    var username = document.getElementById('Username').value;
    if (!username) {
      alert( "Please set your name before taking an event.");
      return;
    }

    var ev = document.getElementById('event-'+eid);
    if (ev.classList.contains('i-am-coordinator'))
        username = '';

    var xhttp = new XMLHttpRequest();
    xhttp.open("POST", "api/set_event_coordinator/"+eid, true);
    xhttp.setRequestHeader("Content-type", "application/json");
    xhttp.onreadystatechange = function() {
        if (xhttp.readyState == XMLHttpRequest.DONE && xhttp.status == 200) {
            var coor = ev.getElementsByClassName('event-coordinator');
            if (coor.length) {
                if (username) {
                    coor[0].innerHTML = '<em>coordinator: </em> '+username;
                    coor[0].setAttribute('coordinator', username);
                } else
                    coor[0].parentNode.removeChild(coor[0]);
            } else {
                if (username) {
                    var pers = ev.getElementsByClassName('event-persons');
                    coor = document.createElement('div');
                    coor.classList.toggle('event-coordinator', true);
                    coor.setAttribute('coordinator', username);
                    coor.innerHTML = '<em>coordinator: </em> '+username;
                    pers[0].insertBefore(coor, pers[0].firstChild);
                }
            }
            update_status();
        }
    }
    xhttp.send( JSON.stringify( { 'coordinator': username } ) );
}

function update_status() {
    var accepted_count = document.querySelectorAll('.event-list-item[event_state=accepted]').length;
    var rejected_count = document.querySelectorAll('.event-list-item[event_state=rejected]').length;
    var taken_count = document.querySelectorAll('.event-list-item .event-coordinator').length;
    var total_count = document.getElementsByClassName('event-list-item').length;
    var total_voted_count = document.querySelectorAll('.event-rating:first-child').length;
    var username = document.getElementById('Username').value;
    var own_voted_count = 0;
    if (username)
        own_voted_count = document.querySelectorAll('.event-rating[submitter="'+username+'"]').length;
    document.getElementById('status').innerHTML = total_count + ' events. ' + accepted_count + ' accepted. ' + rejected_count + ' rejected. ' + (total_count - own_voted_count) + ' todo. ' + (total_count - total_voted_count) + ' unvoted. ' + (total_count - taken_count) + ' untaken.';

    /* Do the math */
    document.querySelectorAll('.event-list-item').forEach(function(ev) {
        if (username) {
            ev.classList.toggle('has-own-rating', ev.querySelectorAll('.event-rating[submitter="'+username+'"]').length > 0);
            ev.classList.toggle('i-am-coordinator', ev.querySelectorAll('.event-coordinator[coordinator="'+username+'"]').length > 0);
        }

        var counts = {};
        var meters = ev.querySelectorAll('.event-rating meter');

        if (!meters.length) {
            ev.querySelectorAll('.top-meter').forEach(function(meter) {
                meter.setAttribute('value', 0);
            });
            return;
        }

        meters.forEach(function(rat) {
            var tmp = counts[rat.getAttribute('category')] || 0;
            counts[rat.getAttribute('category')] = tmp + parseInt(rat.getAttribute('value'));
        });
        var total = 0, i = 0, divisor = meters.length / Object.keys(counts).length;
        for (category in counts) {
            var dest_meter = ev.getElementsByClassName('meter-'+i)[0];
            dest_meter.setAttribute('value', counts[category] / divisor);
            dest_meter.setAttribute('title', category + ': ' + counts[category] / divisor + ' %' );
            total += counts[category] / divisor;
            i++;
        }
        ev.getElementsByClassName('meter-4')[0].setAttribute('value', total / Object.keys(counts).length);
    });
}

document.addEventListener('DOMContentLoaded', function () {
    var username = localStorage.getItem("c3-rating-user");
    if (username)
        document.getElementById('Username').value = username;
    if (window.safari !== undefined)
      document.body.classList.add('safari');
    update_status();
});