'use strict';

(function () {
    var MapEditor = {
        metadata: {
            name: null,
            description: null
        },
        map: null,
        panorama: null,
        selectedMarker: null,
        added: {},
        edited: {},
        deleted: {},

        editMetadata: function () {
            var form = document.getElementById('metadataForm');

            MapEditor.metadata.name = form.elements.name.value;
            MapEditor.metadata.description = form.elements.description.value;

            document.getElementById('mapName').innerHTML = form.elements.name.value ? form.elements.name.value : '[unnamed map]';

            MapGuesser.hideModal();

            document.getElementById('saveButton').disabled = false;
        },

        getPlace: function (placeId, marker) {
            MapGuesser.httpRequest('GET', '/admin/place.json/' + placeId, function () {
                document.getElementById('loading').style.visibility = 'hidden';

                if (!this.response.panoId) {
                    document.getElementById('noPano').style.visibility = 'visible';

                    places[marker.placeId].panoId = -1;
                    places[marker.placeId].noPano = true;

                    return;
                }

                places[marker.placeId].panoId = this.response.panoId;
                places[marker.placeId].noPano = false;

                MapEditor.loadPano(this.response.panoId, places[marker.placeId].pov);
            });
        },

        loadPano: function (panoId, pov) {
            MapEditor.panorama.setVisible(true);
            MapEditor.panorama.setPov({ heading: pov.heading, pitch: pov.pitch });
            MapEditor.panorama.setZoom(pov.zoom);
            MapEditor.panorama.setPano(panoId);
        },

        loadPanoForNewPlace: function (panoLocationData) {
            var placeId = MapEditor.selectedMarker.placeId;

            if (!panoLocationData) {
                places[placeId].panoId = -1;
                places[placeId].noPano = true;

                document.getElementById('noPano').style.visibility = 'visible';

                return;
            }

            var latLng = panoLocationData.latLng;

            places[placeId].panoId = panoLocationData.pano;
            places[placeId].lat = latLng.lat();
            places[placeId].lng = latLng.lng();

            MapEditor.selectedMarker.setLatLng({ lat: places[placeId].lat, lng: places[placeId].lng });
            MapEditor.map.panTo(MapEditor.selectedMarker.getLatLng());

            MapEditor.panorama.setVisible(true);
            MapEditor.panorama.setPov({ heading: 0.0, pitch: 0.0 });
            MapEditor.panorama.setZoom(0.0);
            MapEditor.panorama.setPano(panoLocationData.pano);
        },

        requestPanoData: function (location, canBeIndoor) {
            var sv = new google.maps.StreetViewService();

            sv.getPanorama({
                location: location,
                preference: google.maps.StreetViewPreference.NEAREST,
                radius: MapEditor.map.getSearchRadius(location),
                source: canBeIndoor ? google.maps.StreetViewSource.DEFAULT : google.maps.StreetViewSource.OUTDOOR
            }, function (data, status) {
                var panoLocationData = status === google.maps.StreetViewStatus.OK ? data.location : null;

                if (panoLocationData === null && !canBeIndoor) {
                    MapEditor.requestPanoData(location, true);
                    return;
                }

                document.getElementById('loading').style.visibility = 'hidden';

                MapEditor.loadPanoForNewPlace(panoLocationData);
            });
        },

        select: function (marker) {
            if (MapEditor.selectedMarker === marker) {
                MapEditor.closePlace();
                return;
            }

            document.getElementById('map').classList.add('selected');
            document.getElementById('control').classList.add('selected');
            document.getElementById('noPano').style.visibility = 'hidden';
            document.getElementById('panorama').style.visibility = 'visible';
            document.getElementById('placeControl').style.visibility = 'visible';

            MapEditor.resetSelected();
            MapEditor.selectedMarker = marker;

            MapEditor.map.resize();
            MapEditor.map.panTo(marker.getLatLng());

            MapEditor.panorama.setVisible(false);

            if (marker.placeId) {
                MapEditor.map.changeMarkerIcon(marker, MapEditor.map.iconCollection.iconBlue);

                document.getElementById('deleteButton').style.display = 'block';

                if (places[marker.placeId].panoId) {
                    if (places[marker.placeId].panoId === -1) {
                        document.getElementById('noPano').style.visibility = 'visible';
                    } else {
                        MapEditor.loadPano(places[marker.placeId].panoId, places[marker.placeId].pov);
                    }

                    return;
                }

                document.getElementById('loading').style.visibility = 'visible';

                MapEditor.getPlace(marker.placeId, marker);
            } else {
                marker.placeId = 'new_' + new Date().getTime();

                var latLng = marker.getLatLng();

                places[marker.placeId] = { id: null, lat: latLng.lat, lng: latLng.lng, panoId: null, pov: { heading: 0.0, pitch: 0.0, zoom: 0 }, noPano: false };

                document.getElementById('loading').style.visibility = 'visible';

                MapEditor.requestPanoData(latLng);
            }
        },

        resetSelected: function (del) {
            if (!MapEditor.selectedMarker) {
                return;
            }

            var placeId = MapEditor.selectedMarker.placeId

            if (places[placeId].id && !del) {
                MapEditor.map.changeMarkerIcon(
                    MapEditor.selectedMarker,
                    places[placeId].noPano ? MapEditor.map.iconCollection.iconRed : MapEditor.map.iconCollection.iconGreen
                );
            } else {
                delete places[placeId];
                MapEditor.map.removeMarker(MapEditor.selectedMarker);
            }

            document.getElementById('deleteButton').style.display = 'none';
        },

        applyPlace: function () {
            var placeId = MapEditor.selectedMarker.placeId;

            if (!places[placeId].noPano) {
                var latLng = MapEditor.panorama.getPosition();
                var pov = MapEditor.panorama.getPov();
                var zoom = MapEditor.panorama.getZoom();

                places[placeId].lat = latLng.lat();
                places[placeId].lng = latLng.lng();
                places[placeId].panoId = MapEditor.panorama.getPano();
                places[placeId].pov = { heading: pov.heading, pitch: pov.pitch, zoom: zoom };
            }

            if (!places[placeId].id) {
                places[placeId].id = placeId;
                MapEditor.added[placeId] = places[placeId];

                document.getElementById('added').innerHTML = String(Object.keys(MapEditor.added).length);

                document.getElementById('deleteButton').style.display = 'block';
            } else {
                if (!MapEditor.added[placeId]) {
                    MapEditor.edited[placeId] = places[placeId];

                    document.getElementById('edited').innerHTML = String(Object.keys(MapEditor.edited).length);
                } else {
                    MapEditor.added[placeId] = places[placeId];
                }
            }

            MapEditor.selectedMarker.setLatLng({ lat: places[placeId].lat, lng: places[placeId].lng });

            document.getElementById('saveButton').disabled = false;
        },

        closePlace: function (del) {
            document.getElementById('map').classList.remove('selected');
            document.getElementById('control').classList.remove('selected');
            document.getElementById('noPano').style.visibility = 'hidden';
            document.getElementById('panorama').style.visibility = 'hidden';
            document.getElementById('placeControl').style.visibility = 'hidden';

            MapEditor.resetSelected(del);
            MapEditor.selectedMarker = null;

            MapEditor.map.resize();
        },

        deletePlace: function () {
            var placeId = MapEditor.selectedMarker.placeId;

            if (places[placeId].id && !MapEditor.added[placeId]) {
                MapEditor.deleted[placeId] = places[placeId];

                document.getElementById('deleted').innerHTML = String(Object.keys(MapEditor.deleted).length);
            }

            MapEditor.closePlace(true);

            delete MapEditor.added[placeId];
            delete MapEditor.edited[placeId];
            delete places[placeId];

            document.getElementById('added').innerHTML = String(Object.keys(MapEditor.added).length);
            document.getElementById('edited').innerHTML = String(Object.keys(MapEditor.edited).length);

            document.getElementById('saveButton').disabled = false;
        },

        saveMap: function () {
            document.getElementById('loading').style.visibility = 'visible';

            var data = new FormData();

            if (MapEditor.metadata.name !== null) {
                data.append('name', MapEditor.metadata.name);
            }
            if (MapEditor.metadata.description !== null) {
                data.append('description', MapEditor.metadata.description);
            }

            for (var placeId in MapEditor.added) {
                if (!MapEditor.added.hasOwnProperty(placeId)) {
                    continue;
                }
                data.append('added[]', JSON.stringify(MapEditor.added[placeId]));
            }
            for (var placeId in MapEditor.edited) {
                if (!MapEditor.edited.hasOwnProperty(placeId)) {
                    continue;
                }
                data.append('edited[]', JSON.stringify(MapEditor.edited[placeId]));
            }
            for (var placeId in MapEditor.deleted) {
                if (!MapEditor.deleted.hasOwnProperty(placeId)) {
                    continue;
                }
                data.append('deleted[]', JSON.stringify(MapEditor.deleted[placeId]));
            }

            MapGuesser.httpRequest('POST', '/admin/saveMap/' + mapId + '/json', function () {
                document.getElementById('loading').style.visibility = 'hidden';

                if (this.response.error) {
                    //TODO: handle this error
                    return;
                }

                MapEditor.replacePlaceIdsToReal(this.response.added);

                if (mapId === 0) {
                    mapId = this.response.mapId;
                    window.history.replaceState(null, '', '/admin/mapEditor/' + mapId);
                }

                MapEditor.added = {};
                MapEditor.edited = {};
                MapEditor.deleted = {};

                document.getElementById('added').innerHTML = '0';
                document.getElementById('edited').innerHTML = '0';
                document.getElementById('deleted').innerHTML = '0';

                document.getElementById('saveButton').disabled = true;
            }, data);
        },

        replacePlaceIdsToReal: function (addedPlaces) {
            for (var i = 0; i < addedPlaces.length; ++i) {
                var tempId = addedPlaces[i].tempId;
                var placeId = addedPlaces[i].id;
                places[tempId].id = placeId;
            }
        }
    };

    var Util = {
        getHighResData: function () {
            if (window.devicePixelRatio >= 4) {
                return { ppi: 320, tileSize: 128, zoomOffset: 1, minZoom: 0, maxZoom: 18 };
            } else if (window.devicePixelRatio >= 2) {
                return { ppi: 250, tileSize: 256, zoomOffset: 0, minZoom: 1, maxZoom: 19 };
            } else {
                return { ppi: 72, tileSize: 512, zoomOffset: -1, minZoom: 2, maxZoom: 20 };
            }
        },

        extractCoordinates: function (coordinatesStr) {
            var coordinates = { valid: false, latlng: { lat: 0., lng: 0. } };
            var delimiters = [',', ' ', ';'];

            coordinatesStr = coordinatesStr.trim();
            if (coordinatesStr.length == 0) {
                return coordinates;
            }

            for (var delimiter of delimiters) {
                if (coordinatesStr.indexOf(delimiter) != -1) {

                    var coordinatesArr = coordinatesStr.split(delimiter);
                    coordinates.latlng.lat = parseFloat(coordinatesArr[0]);
                    coordinates.latlng.lng = parseFloat(coordinatesArr[1]);

                    if (!isNaN(coordinates.latlng.lat) && !isNaN(coordinates.latlng.lng)) {
                        coordinates.valid = true;
                        return coordinates;
                    }
                }
            }

            return coordinates;
        }
    };

    var LMapWrapper = {
        map: null,
        markers: null,
        divId: null,
        iconCollection: {
            iconGreen: L.icon({
                iconUrl: STATIC_ROOT + '/img/markers/marker-green.svg?rev' + REVISION,
                iconSize: [24, 32],
                iconAnchor: [12, 32]
            }),
            iconRed: L.icon({
                iconUrl: STATIC_ROOT + '/img/markers/marker-red.svg?rev=' + REVISION,
                iconSize: [24, 32],
                iconAnchor: [12, 32]
            }),
            iconBlue: L.icon({
                iconUrl: STATIC_ROOT + '/img/markers/marker-blue.svg?rev=' + REVISION,
                iconSize: [24, 32],
                iconAnchor: [12, 32]
            })
        },

        init: function (divId, places) {
            document.getElementById(divId).style.display = "block";

            if (!LMapWrapper.map) {
                LMapWrapper.divId = divId;
                LMapWrapper.map = L.map(LMapWrapper.divId, {
                    center: { lat: 0., lng: 0. },
                    zoom: 2
                });

                LMapWrapper.map.on('click', function (e) {
                    LMapWrapper.placeMarker(e.latlng);
                });

                var highResData = Util.getHighResData();

                L.tileLayer(tileUrl, {
                    attribution: tileAttribution,
                    subdomains: '1234',
                    ppi: highResData.ppi,
                    tileSize: highResData.tileSize,
                    zoomOffset: highResData.zoomOffset,
                    minZoom: highResData.minZoom,
                    maxZoom: highResData.maxZoom
                }).addTo(LMapWrapper.map);

                if (mapId) {
                    LMapWrapper.map.fitBounds(L.latLngBounds({ lat: mapBounds.south, lng: mapBounds.west }, { lat: mapBounds.north, lng: mapBounds.east }));
                }
            }

            LMapWrapper.loadMarkers(places);

            document.getElementById('streetViewCoverSelector').style.display = 'none';
        },

        hide: function () {
            document.getElementById(LMapWrapper.divId).style.display = 'none';
        },

        loadMarkers: function (places) {
            if (!LMapWrapper.markers) {
                LMapWrapper.markers = L.markerClusterGroup({
                    maxClusterRadius: 50
                });
            } else {
                LMapWrapper.markers.clearLayers();
            }

            for (var placeId in places) {
                if (!places.hasOwnProperty(placeId)) {
                    continue;
                }

                var place = places[placeId];

                var marker = L.marker({ lat: place.lat, lng: place.lng }, {
                    icon: place.noPano ? LMapWrapper.iconCollection.iconRed : LMapWrapper.iconCollection.iconGreen,
                    zIndexOffset: 1000
                })
                    .addTo(LMapWrapper.markers)
                    .on('click', function () {
                        MapEditor.select(this);
                    });

                marker.placeId = placeId;
            }

            LMapWrapper.map.addLayer(LMapWrapper.markers);
        },

        // TODO: check whether marker is already existing on the map for the coordinates
        //       or alternatively block saving for matching coordinates
        placeMarker: function (latLng) {
            var marker = L.marker(latLng, {
                icon: LMapWrapper.iconCollection.iconBlue,
                zIndexOffset: 2000
            })
                .addTo(LMapWrapper.markers)
                .on('click', function () {
                    MapEditor.select(this);
                });

            MapEditor.select(marker);
        },

        panTo: function (latLng) {
            LMapWrapper.map.panTo(latLng);
        },

        resize: function () {
            LMapWrapper.map.invalidateSize(true);
        },

        changeMarkerIcon: function (marker, icon) {
            marker.setIcon(icon);
            marker.setZIndexOffset(2000);
        },

        removeMarker: function (marker) {
            LMapWrapper.markers.removeLayer(marker);
        },

        toggleStreetViewCover: function () { },

        getSearchRadius: function (location) {
            return 100;
        }
    };

    var GMapWrapper = {
        map: null,
        markers: null,
        divId: null,
        streetViewCover: null,
        streetViewCoverOn: false,
        iconCollection: {
            iconGreen: {
                url: STATIC_ROOT + '/img/markers/marker-green.svg?rev' + REVISION,
                scaledSize: new google.maps.Size(24, 32), // scaled size
                origin: new google.maps.Point(0, 0), // origin
                anchor: new google.maps.Point(12, 32) // anchor
            },
            iconRed: {
                url: STATIC_ROOT + '/img/markers/marker-red.svg?rev' + REVISION,
                scaledSize: new google.maps.Size(24, 32), // scaled size
                origin: new google.maps.Point(0, 0), // origin
                anchor: new google.maps.Point(12, 32) // anchor
            },
            iconBlue: {
                url: STATIC_ROOT + '/img/markers/marker-blue.svg?rev' + REVISION,
                scaledSize: new google.maps.Size(24, 32), // scaled size
                origin: new google.maps.Point(0, 0), // origin
                anchor: new google.maps.Point(12, 32) // anchor
            }
        },

        init: function (divId, places) {
            document.getElementById(divId).style.display = "block";

            if (!GMapWrapper.map) {
                GMapWrapper.divId = divId;
                GMapWrapper.map = new google.maps.Map(document.getElementById(GMapWrapper.divId), {
                    center: { lat: 0., lng: 0. },
                    zoom: 2,
                    fullscreenControl: false,
                    zoomControl: true,
                    zoomControlOptions: {
                        position: google.maps.ControlPosition.LEFT_BOTTOM
                    },
                    streetViewControl: false,
                    draggableCursor: 'crosshair'
                });

                GMapWrapper.streetViewCover = new google.maps.StreetViewCoverageLayer();

                GMapWrapper.map.addListener('click', function (mapsMouseEvent) {
                    GMapWrapper.placeMarker({
                        lat: mapsMouseEvent.latLng.lat(),
                        lng: mapsMouseEvent.latLng.lng()
                    });
                });

                if (mapId) {
                    GMapWrapper.map.fitBounds({ south: mapBounds.south, west: mapBounds.west, north: mapBounds.north, east: mapBounds.east });
                }
            }

            GMapWrapper.loadMarkers(places);

            document.getElementById('streetViewCoverSelector').style.display = 'block'
        },

        hide: function () {
            document.getElementById(GMapWrapper.divId).style.display = 'none';
        },

        loadMarkers: function (places) {
            if (!GMapWrapper.markers) {
                GMapWrapper.markers = new MarkerClusterer(GMapWrapper.map, [], {
                    imagePath: STATIC_ROOT + '/img/markers/m',
                    imageExtension: 'png?rev' + REVISION
                });
            } else {
                GMapWrapper.markers.clearMarkers();
            }

            for (var placeId in places) {
                if (!places.hasOwnProperty(placeId)) {
                    continue;
                }

                var place = places[placeId];

                var marker = new google.maps.Marker({
                    position: {
                        lat: place.lat,
                        lng: place.lng
                    },
                    icon: place.noPano ? GMapWrapper.iconCollection.iconRed : GMapWrapper.iconCollection.iconGreen
                });

                marker.getLatLng = function () { return { lat: this.getPosition().lat(), lng: this.getPosition().lng() } };
                marker.setLatLng = function (coords) { this.setPosition(coords) };

                marker.addListener('click', function () {
                    MapEditor.select(this);
                });

                marker.placeId = placeId;

                GMapWrapper.markers.addMarker(marker);
            }
        },

        // TODO: check whether marker is already existing on the map for the coordinates
        //       or alternatively block saving for matching coordinates
        placeMarker: function (latLng) {
            var marker = new google.maps.Marker({
                map: GMapWrapper.map,
                position: latLng,
                icon: GMapWrapper.iconCollection.iconBlue,
            });

            marker.getLatLng = function () { return { lat: this.getPosition().lat(), lng: this.getPosition().lng() } };
            marker.setLatLng = function (coords) { this.setPosition(coords) };

            marker.addListener('click', function () {
                MapEditor.select(this);
            });

            GMapWrapper.markers.addMarker(marker);

            MapEditor.select(marker);
        },

        panTo: function (latLng) {
            GMapWrapper.map.panTo(latLng);
        },

        resize: function () {
            google.maps.event.trigger(GMapWrapper.map, 'resize');
        },

        changeMarkerIcon: function (marker, icon) {
            marker.setIcon(icon);
        },

        removeMarker: function (marker) {
            GMapWrapper.markers.removeMarker(marker);
        },

        toggleStreetViewCover: function () {
            if (GMapWrapper.streetViewCoverOn) {
                GMapWrapper.streetViewCover.setMap(null);
                GMapWrapper.streetViewCoverOn = false;
            } else {
                GMapWrapper.streetViewCover.setMap(GMapWrapper.map);
                GMapWrapper.streetViewCoverOn = true;
            }
        },

        getSearchRadius: function (location) {
            // source: https://www.yorku.ca/mack/CHI01.htm
            var movementOffset = 4;

            // source: https://groups.google.com/g/google-maps-js-api-v3/c/hDRO4oHVSeM/m/osOYQYXg2oUJ?pli=1
            var metersPerPixel = 156543.03392 * Math.cos(location.lat * Math.PI / 180) / Math.pow(2, GMapWrapper.map.getZoom());

            var minSearchRadius = 5;

            var searchRadius = Math.max(minSearchRadius, Math.round(movementOffset * metersPerPixel));

            return searchRadius;
        }
    };

    // initialize content of #map with google maps
    MapEditor.map = GMapWrapper;
    MapEditor.map.init('gmap', places);

    MapEditor.panorama = new google.maps.StreetViewPanorama(document.getElementById('panorama'), {
        // switch off fullscreenControl because positioning doesn't work
        fullscreenControl: false,
        fullscreenControlOptions: {
            position: google.maps.ControlPosition.LEFT_TOP
        },
        motionTracking: false
    });

    document.getElementById('mapName').onclick = function (e) {
        e.preventDefault();

        MapGuesser.showModal('metadata');
        document.getElementById('metadataForm').elements.name.select();
    };

    document.getElementById('metadataForm').onsubmit = function (e) {
        e.preventDefault();

        MapEditor.editMetadata();
    };

    document.getElementById('closeMetadataButton').onclick = function () {
        MapGuesser.hideModal();
    };

    document.getElementById('saveButton').onclick = function () {
        MapEditor.saveMap();
    };

    document.getElementById('applyButton').onclick = function () {
        MapEditor.applyPlace();
    };

    document.getElementById('closeButton').onclick = function () {
        MapEditor.closePlace();
    };

    document.getElementById('deleteButton').onclick = function () {
        MapEditor.deletePlace();
    };

    document.getElementById('jumpButton').onclick = function (e) {
        var coordinatesStr = document.getElementById("jumpCoordinates").value;
        var coordinates = Util.extractCoordinates(coordinatesStr);

        if (coordinates.valid) {
            MapEditor.map.placeMarker(coordinates.latlng);
        }
    };

    document.getElementById('jumpCoordinates').onkeyup = function (e) {
        var coordinatesStr = document.getElementById("jumpCoordinates").value;
        var coordinates = Util.extractCoordinates(coordinatesStr);
        var jumpButton = document.getElementById("jumpButton");

        if (coordinates.valid) {
            jumpButton.disabled = false;

            if (e.key == 'Enter') {
                MapEditor.map.placeMarker(coordinates.latlng);
            }
        }
        else {
            jumpButton.disabled = true;
        }
    };

    document.getElementById('mapSelector').onclick = function () {
        MapEditor.closePlace();
        MapEditor.map.hide();

        if (MapEditor.map === GMapWrapper) {
            MapEditor.map = LMapWrapper;
            MapEditor.map.init('lmap', places);
        } else {
            MapEditor.map = GMapWrapper;
            MapEditor.map.init('gmap', places);
        }
    }

    document.getElementById('streetViewCoverSelector').onclick = function () {
        MapEditor.map.toggleStreetViewCover();
    }

})();