var widths = [12, 13, 13, 13, 13, 13, 13, 13];
var opas = [0.8, 0.6, 0.5, 0.5, 0.4];
var mwidths = [1, 1, 1, 1.5, 2, 3, 5, 6, 6, 4, 3, 2];

var backend = "";
var openGr = -1;
var openSt = -1;

function marker(stat, z) {
    if (stat.g.length == 1) {
        if (z > 15) {
            return L.circle(
                stat.g[0], {
                    color: 'black',
                    fillColor: stat.e ? 'red' : stat.s ? '#0000c3' : '#78f378',
                    radius: mwidths[23 - z],
                    fillOpacity: 1,
                    weight: z > 17 ? 1.5 : 1,
                    id: stat.i
                }
            );
        } else {
            return L.polyline(
                [stat.g[0], stat.g[0]], {
                    color: stat.e ? 'red' : stat.s ? '#0000c3' : '#78f378',
                    fillColor: stat.e ? 'red' : stat.s ? '#0000c3' : '#78f378',
                    weight: widths[15 - z],
                    opacity: opas[15 - z],
                    id: stat.i
                }
            );
        }
    } else {
        return L.polygon(
            stat.g, {
                color: z > 15 ? 'black': (stat.e ? 'red' : stat.s ? '#0000c3' : '#78f378'),
                fillColor: stat.e ? 'red' : stat.s ? '#0000c3' : '#78f378',
                smoothFactor: 0,
                fillOpacity: 0.75,
                weight: z > 17 ? 1.5 : 1,
                id: stat.i
            }
        );
    }
}

function poly(group, z) {
    var col = group.e ? 'red' : group.s ? '#0000c3' : '#85f385';
    var style = {
        color: col,
        fillColor: col,
        smoothFactor: 0.4,
        fillOpacity: 0.2,
        id: group.i
    };
    if (group.n) {
        style.color = "#0000c3";
        style.fillColor = "#0000c3";
    }
    if (z < 16) {
        style.weight = 11;
        style.opacity = 0.5;
        style.fillOpacity = 0.5;
    }
    return L.polygon(group.g, style)
}

function sugArr(sug, z) {
    return L.polyline(sug.a, {
        id: sug.i,
        color: '#0000c3',
        smoothFactor: 0.1,
        weight: 4,
        opacity: 0.5
    });
}

function renderStat(stat) {
    openSt = stat.id;
    nodeHl(stat.id);
    var attrrows = {};
    var ll = {
        lat: stat.lat,
        lon: stat.lon
    };

    var way = stat.osmid < 0;
    var osmid = Math.abs(stat.osmid);
    var ident = way ? "Way" : "Node";

    var content = document.createElement('div');
    content.setAttribute("id", "nav")
    var suggD = document.createElement('div');
    suggD.setAttribute("id", "sugg")

    content.innerHTML = ident + " <a target='_blank' href='https://www.openstreetmap.org/"+ident.toLowerCase()+"/" + osmid + "'>" + osmid + "</a>";

    if (stat.attrs.name) {
        content.innerHTML += " (<b>\"" + stat.attrs.name + "\"</b>)";
    }

    content.innerHTML += "<a class='editbut' target='_blank' href='https://www.openstreetmap.org/edit?" + ident.toLowerCase() + "=" + osmid +"'>&#9998;</a>";

    var attrTbl = document.createElement('table');
    attrTbl.setAttribute("id", "attr-tbl")
    content.appendChild(attrTbl);
    content.appendChild(suggD);

    var tbody = document.createElement('tbody');
    attrTbl.appendChild(tbody);

    for (var key in stat.attrs) {
        var row = document.createElement('tr');
        var col1 = document.createElement('td');
        var col2 = document.createElement('td');
        col2.className = "err-wrap";
        tbody.appendChild(row);
        row.appendChild(col1);
        row.appendChild(col2);
        col1.innerHTML = "<a href=\"https://wiki.openstreetmap.org/wiki/Key:" + key + "\" target=\"_blank\"><tt>" + key + "</tt></a>";
        for (var i = 0; i < stat.attrs[key].length; i++) col2.innerHTML += "<span class='attrval'>" + stat.attrs[key][i] + "</span>" + "<br>";
        attrrows[key] = row;
    }

    for (var i = 0; i < stat.attrerrs.length; i++) {
        var err = stat.attrerrs[i];
        var row = attrrows[err.attr[0]];
        row.className = "err-" + Math.round(err.conf * 10);

        var info = document.createElement('div');

        if (err.other_grp) {
            // the mismatch was with a group name
            if (err.other_osmid > 1) {
                info.innerHTML = "Does not match <tt>" + err.other_attr[0] + "</tt> in relation <a onmouseover='groupHl( " + err.other_grp + ")' onmouseout='groupUnHl( " + err.other_grp + ")' target=\"_blank\" href=\"https://www.openstreetmap.org/relation/" + Math.abs(err.other_osmid) + "\">" + Math.abs(err.other_osmid) + "</a>";
            } else {
                info.innerHTML = "Does not match <tt>" + err.other_attr[0] + "</tt> in relation <span onmouseover='groupHl( " + err.other_grp + ")' onmouseout='groupUnHl( " + err.other_grp + ")'>" + Math.abs(err.other_osmid) + "</span>";
            }
        } else {
            // the mismatch was with another station

            if (err.other_osmid != stat.osmid) {
                var ident = err.other_osmid < 0 ? "way" : "node";
                info.innerHTML = "Does not match <tt>" + err.other_attr[0] + "</tt> in " + ident + " <a onmouseover='nodeHl( " + err.other + ")' onmouseout='nodeUnHl( " + err.other + ")' target=\"_blank\" href=\"https://www.openstreetmap.org/"+ident+"/" + Math.abs(err.other_osmid) + "\">" + Math.abs(err.other_osmid) + "</a>";
            } else {
                info.innerHTML = "Does not match <tt>" + err.other_attr[0] + "</tt> = '" + err.other_attr[1] + "'";
            }
        }
        info.className = 'attr-err-info';
        row.childNodes[1].appendChild(info);
    }

    var suggList = document.createElement('ul');

    if (stat.su.length) {
        var a = document.createElement('span');
        a.className = "sugtit";
        a.innerHTML = "Suggestions";
        suggD.appendChild(a);
    }

    suggD.appendChild(suggList);

    for (var i = 0; i < stat.su.length; i++) {
        var sugg = stat.su[i];

        var suggDiv = document.createElement('li');

        if (sugg.type == 1) {
            suggDiv.innerHTML = "Move into a <span class='grouplink' onmouseover='groupHl( " + sugg.target_gid + ")' onmouseout='groupUnHl( " + sugg.target_gid + ")'>new relation</span> <tt>public_transport=stop_area</tt>.";
        } else if (sugg.type == 2) {
            suggDiv.innerHTML = "Move into relation <a onmouseover='groupHl( " + sugg.target_gid + ")' onmouseout='groupUnHl( " + sugg.target_gid + ")' href=\"https://www.openstreetmap.org/relation/" + sugg.target_osm_rel_id + "\" target=\"_blank\">" + sugg.target_osm_rel_id + "</a>.";
        } else if (sugg.type == 3) {
            suggDiv.innerHTML = "Move from relation <a onmouseover='groupHl( " + sugg.orig_gid + ")' onmouseout='groupUnHl( " + sugg.orig_gid + ")' href=\"https://www.openstreetmap.org/relation/" + sugg.orig_osm_rel_id + "\" target=\"_blank\">" + sugg.orig_osm_rel_id + "</a> into a <span class='grouplink' onmouseover='groupHl( " + sugg.target_gid + ")' onmouseout='groupUnHl( " + sugg.target_gid + ")'>new relation</span> <tt>public_transport=stop_area</tt>.";
        } else if (sugg.type == 4) {
            suggDiv.innerHTML = "Move from relation <a onmouseover='groupHl( " + sugg.orig_gid + ")' onmouseout='groupUnHl( " + sugg.orig_gid + ")' href=\"https://www.openstreetmap.org/relation/" + sugg.orig_osm_rel_id + "\" target=\"_blank\">" + sugg.orig_osm_rel_id + "</a> into relation <a onmouseover='groupHl( " + sugg.target_gid + ")' onmouseout='groupUnHl( " + sugg.target_gid + ")' href=\"https://www.openstreetmap.org/relation/" + sugg.target_osm_rel_id + "\" target=\"_blank\">" + sugg.target_osm_rel_id + "</a>.";
        } else if (sugg.type == 5) {
            suggDiv.innerHTML = "Move out of relation <a onmouseover='groupHl( " + sugg.orig_gid + ")' onmouseout='groupUnHl( " + sugg.orig_gid + ")' href=\"https://www.openstreetmap.org/relation/" + sugg.orig_osm_rel_id + "\" target=\"_blank\">" + sugg.orig_osm_rel_id + "</a>";
        } else if (sugg.type == 6) {
            suggDiv.innerHTML = "Fix attribute <tt>" + sugg.attr + "</tt>.";
        } else if (sugg.type == 7) {
            suggDiv.innerHTML = "Consider adding a <tt><a target='_blank' href='https://wiki.openstreetmap.org/wiki/Key:name'>name</a></tt> attribute.";
        } else if (sugg.type == 8) {
            suggDiv.innerHTML = "Attribute <tt>" + sugg.attr + "</tt> seems to be a track number. Use <tt>ref</tt> for this and set <tt>" + sugg.attr + "</tt> to the station name.";
        }

        suggList.appendChild(suggDiv);
    }

    if (map.getZoom() < 18) {
        map.setView(ll, 18, {
            animate: true
        });
    }

    L.popup({
            opacity: 0.8
        })
        .setLatLng(ll)
        .setContent(content)
        .openOn(map)
        .on('remove', function() {openSt = -1; nodeUnHl(stat.id);;});
}

function openStat(id) {
    window.xmlhttp = new XMLHttpRequest();
    window.xmlhttp.onreadystatechange = function() {
        if (this.readyState == 4 && this.status == 200 && this == window.xmlhttp) {
            var content = JSON.parse(this.responseText);
            renderStat(content);
        }
    };

    window.xmlhttp.open("GET", backend + "/stat?id=" + id, true);
    window.xmlhttp.send();
}

function renderGroup(grp, ll) {
    openGr = grp.id;
    var attrrows = {};
    groupHl(grp.id);

    var content = document.createElement('div');
    content.setAttribute("id", "nav");

    var newMembers = document.createElement('div');
    newMembers.setAttribute("id", "group-stations-new")
    newMembers.innerHTML = "<span class='newmemberstit'>New Members</span>";

    var oldMembers = document.createElement('div');
    oldMembers.setAttribute("id", "group-stations-old")
    oldMembers.innerHTML = "<span class='oldmemberstit'>Existing Members</span>";

    if (grp.osmid == 1) {
        content.innerHTML = "<span class='grouplink'>New relation</span> <tt>public_transport=stop_area</tt>";
    } else {
        content.innerHTML = "OSM relation <a target='_blank' href='https://www.openstreetmap.org/relation/" + grp.osmid + "'>" + grp.osmid + "</a>";

        if (grp.attrs.name) {
            content.innerHTML += " (<b>\"" + grp.attrs.name + "\"</b>)";
        }

        content.innerHTML += "<a class='editbut' target='_blank' href='https://www.openstreetmap.org/edit?relation=" + grp.osmid +"'>&#9998;</a>";
    }

    var attrTbl = document.createElement('table');
    attrTbl.setAttribute("id", "attr-tbl")
    content.appendChild(attrTbl);

    var tbody = document.createElement('tbody');
    attrTbl.appendChild(tbody);

    var suggD = document.createElement('div');
    suggD.setAttribute("id", "sugg")

    for (var key in grp.attrs) {
        var row = document.createElement('tr');
        var col1 = document.createElement('td');
        var col2 = document.createElement('td');
        col2.className = "err-wrap";
        tbody.appendChild(row);
        row.appendChild(col1);
        row.appendChild(col2);
        col1.innerHTML = "<a href=\"https://wiki.openstreetmap.org/wiki/Key:" + key + "\" target=\"_blank\"><tt>" + key + "</tt></a>";
        for (var i = 0; i < grp.attrs[key].length; i++) col2.innerHTML += "<span class='attrval'>" + grp.attrs[key][i] + "</span>" + "<br>";
        attrrows[key] = row;
    }

    for (var i = 0; i < grp.attrerrs.length; i++) {
        var err = grp.attrerrs[i];
        var row = attrrows[err.attr[0]];
        row.className = "err-" + Math.round(err.conf * 10);

        var info = document.createElement('div');

        if (err.other_grp) {
            // the mismatch was with a group name
            if (err.other_osmid != grp.osmid) {
                if (err.other_osmid > 1) {
                    info.innerHTML = "Does not match <tt>" + err.other_attr[0] + "</tt> in relation <a onmouseover='groupHl( " + err.other_grp + ")' onmouseout='groupUnHl( " + err.other_grp + ")' target=\"_blank\" href=\"https://www.openstreetmap.org/relation/" + Math.abs(err.other_osmid) + "\">" + Math.abs(err.other_osmid) + "</a>";
                } else {
                    info.innerHTML = "Does not match <tt>" + err.other_attr[0] + "</tt> in relation <span onmouseover='groupHl( " + err.other_grp + ")' onmouseout='groupUnHl( " + err.other_grp + ")'>" + Math.abs(err.other_osmid) + "</span>";
                }
            } else {
                info.innerHTML = "Does not match <tt>" + err.other_attr[0] + "</tt> = '" + err.other_attr[1] + "'";
            }
        } else {
            // the mismatch was with another station
            var ident = err.other_osmid < 0 ? "way" : "node";
            info.innerHTML = "Does not match <tt>" + err.other_attr[0] + "</tt> in " + ident + " <a onmouseover='nodeHl( " + err.other + ")' onmouseout='nodeUnHl( " + err.other + ")' target=\"_blank\" href=\"https://www.openstreetmap.org/"+ident+"/" + Math.abs(err.other_osmid) + "\">" + Math.abs(err.other_osmid) + "</a>";
        }
        info.className = 'attr-err-info';
        row.childNodes[1].appendChild(info);
    }

    content.appendChild(newMembers);
    if (grp.osmid != 1) content.appendChild(oldMembers);

    for (var key in grp.stations) {
        var stat = grp.stations[key];
        var row = document.createElement('div');
        var ident = stat.osmid < 0 ? "Way" : "Node";

        row.innerHTML = ident + " <a onmouseover='nodeHl( " + stat.id + ")' onmouseout='nodeUnHl( " + stat.id + ")' target='_blank' href='https://www.openstreetmap.org/" + ident.toLowerCase() + "/" + Math.abs(stat.osmid) + "'>" + Math.abs(stat.osmid) + "</a>";

        if (stat.attrs.name) {
            row.innerHTML += " (<b>\"" + stat.attrs.name + "\"</b>)";
        }

        row.style.backgroundColor = stat.e ? '#f58d8d' : stat.s ? '#b6b6e4' : '#c0f7c0';

        if (grp.osmid == 1 || stat.orig_group != grp.id) newMembers.appendChild(row);
        else {
            oldMembers.appendChild(row);
            if (stat.group != grp.id) {
                row.className = "del-stat";
            }
        }
    }

    var suggList = document.createElement('ul');

    if (grp.su.length) {
        var a = document.createElement('span');
        a.className = "sugtit";
        a.innerHTML = "Suggestions";
        suggD.appendChild(a);
    }

    suggD.appendChild(suggList);

    for (var i = 0; i < grp.su.length; i++) {
        var sugg = grp.su[i];

        var suggDiv = document.createElement('li');

        if (sugg.type == 6) {
            suggDiv.innerHTML = "Fix attribute <tt>" + sugg.attr + "</tt>.";
        } else if (sugg.type == 7) {
            suggDiv.innerHTML = "Consider adding a <tt><a target='_blank' href='https://wiki.openstreetmap.org/wiki/Key:name'>name</a></tt> attribute.";
        } else if (sugg.type == 8) {
            suggDiv.innerHTML = "Attribute <tt>" + sugg.attr + "</tt> seems to be a track number. Use <tt>ref</tt> for this and set <tt>" + sugg.attr + "</tt> to the station name.";
        }

        suggList.appendChild(suggDiv);
    }

    content.appendChild(suggD);

    if (map.getZoom() < 18) {
        map.setView(ll, 18, {
            animate: true
        });
    }

    L.popup({
            opacity: 0.8
        })
        .setLatLng(ll)
        .setContent(content)
        .openOn(map)
        .on('remove', function() {openGr = -1; groupUnHl(grp.id)});
}

function openGroup(id, ll) {
    window.xmlhttp = new XMLHttpRequest();
    window.xmlhttp.onreadystatechange = function() {
        if (this.readyState == 4 && this.status == 200 && this == window.xmlhttp) {
            var content = JSON.parse(this.responseText);
            renderGroup(content, ll);
        }
    };

    window.xmlhttp.open("GET", backend + "/group?id=" + id, true);
    window.xmlhttp.send();
}

function groupHl(id) {
    if (!document.groupIdx[id]) return;
    document.groupIdx[id].setStyle({
        'weight': 6,
        'color': "#eecc00"
    });
}

function groupUnHl(id) {
    if (!document.groupIdx[id]) return;
    document.groupIdx[id].setStyle({
        'weight': 3,
        'color': document.groupIdx[id].options["fillColor"]
    });
}

function nodeHl(id) {
    if (!document.nodeIdx[id]) return;

    if (map.getZoom() > 15) {
        document.nodeIdx[id].setStyle({
            'weight': 5,
            'color': "#eecc00"
        });
    } else {
        document.nodeIdx[id].setStyle({
            'color': "#eecc00"
        });   
    }
}

function nodeUnHl(id) {
    if (!document.nodeIdx[id]) return;

    if (map.getZoom() > 15) {
        document.nodeIdx[id].setStyle({
            'weight': 1,
            'color': "black"
        });
    } else {
        document.nodeIdx[id].setStyle({
            'color': document.nodeIdx[id].options["fillColor"]
        });   
    }
}

var map = L.map('map', {
    renderer: L.canvas(),
    attributionControl: false,
}).setView([47.9965, 7.8469], 13);

map.addControl(L.control.attribution({
    position: 'bottomright',
    prefix: '&copy; <a href="http://ad.cs.uni-freiburg.de">University of Freiburg, Chair of Algorithms and Data Structures</a>'
}));

L.tileLayer('http://{s}.tile.stamen.com/toner-lite/{z}/{x}/{y}.png', {
    maxZoom: 20,
    attribution: '&copy; <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a>',
    opacity: 0.8
}).addTo(map);

var layer = L.featureGroup().addTo(map);
var labelLayer = L.featureGroup().addTo(map);

map.on("moveend", function() {
    render();
});

function render() {
    window.xmlhttp = new XMLHttpRequest();

    if (map.getZoom() < 11) {
        window.xmlhttp.onreadystatechange = function() {
            if (this.readyState == 4 && this.status == 200 && this == window.xmlhttp) {
                var content = JSON.parse(this.responseText);

                layer.clearLayers();
                labelLayer.clearLayers();

                var blur = 22 - map.getZoom();
                var rad = 25 - map.getZoom();

                layer.addLayer(L.heatLayer(content.ok, {
                    max: 500,
                    gradient: {
                        0: '#cbf7cb',
                        0.5: '#78f378',
                        1: '#29c329'
                    },
                    minOpacity: 0.65,
                    blur: blur,
                    radius: rad
                }));
                layer.addLayer(L.heatLayer(content.sugg, {
                    max: 500,
                    gradient: {
                        0: '#7f7fbd',
                        0.5: '#4444b3',
                        1: '#0606c1'
                    },
                    minOpacity: 0.65,
                    blur: blur - 3,
                    radius: Math.min(12, rad - 3)
                }));

                layer.addLayer(L.heatLayer(content.err, {
                    max: 500,
                    gradient: {
                        0: '#f39191',
                        0.5: '#ff5656',
                        1: '#ff0000'
                    },
                    minOpacity: 0.75,
                    blur: blur - 3,
                    radius: Math.min(10, rad - 3),
                    maxZoom: 15
                }));
            }
        };

        window.xmlhttp.open("GET", backend + "/heatmap?z=" + map.getZoom() + "&bbox=" + [map.getBounds().getSouthWest().lat, map.getBounds().getSouthWest().lng, map.getBounds().getNorthEast().lat, map.getBounds().getNorthEast().lng].join(","), true);
        window.xmlhttp.send();
    } else {
        window.xmlhttp.onreadystatechange = function() {
            if (this.readyState == 4 && this.status == 200 && this == window.xmlhttp) {
                var content = JSON.parse(this.responseText);

                layer.clearLayers();
                labelLayer.clearLayers();
                document.groupIdx = {};
                document.nodeIdx = {};

                var stations = [];
                var labels = [];
                for (var i = 0; i < content.stats.length; i++) {
                    stat = content.stats[i];
                    var ndMarker = marker(stat, map.getZoom());
                    stations.push(ndMarker);
                    document.nodeIdx[stat.i] = ndMarker;
                }

                var groups = [];
                for (var i = 0; i < content.groups.length; i++) {
                    group = content.groups[i];
                    var groupPoly = poly(group, map.getZoom());
                    groups.push(groupPoly);
                    document.groupIdx[group.i] = groupPoly;
                }

                var suggs = [];
                for (var i = 0; i < content.su.length; i++) {
                    sugg = content.su[i];
                    var a = sugArr(sugg, map.getZoom());
                    suggs.push(a);
                }

                if (map.getZoom() > 13) {
                    layer.addLayer(L.featureGroup(groups).on('click', function(a) {
                        openGroup(a.layer.options.id, a.layer.getBounds().getCenter());
                    }));
                }

                if (map.getZoom() > 15) {
                    labelLayer.addLayer(L.featureGroup(labels));
                    layer.addLayer(L.featureGroup(suggs).on('click', function(a) {
                        openStat(a.layer.options.id);
                    }));
                }

                layer.addLayer(L.featureGroup(stations).on('click', function(a) {
                    openStat(a.layer.options.id);
                }));

                groupHl(openGr);
                nodeHl(openSt);
            }
        };

        window.xmlhttp.open("GET", backend + "/map?z=" + map.getZoom() + "&bbox=" + [map.getBounds().getSouthWest().lat, map.getBounds().getSouthWest().lng, map.getBounds().getNorthEast().lat, map.getBounds().getNorthEast().lng].join(","), true);
        window.xmlhttp.send();
    }
}

render();