"use strict";

function init_wrmap(i, jq_map) {
	// define constants
	let EPSG4326 = ol.proj.get("EPSG:4326"); // lon/lat
	let EPSG3857 = ol.proj.get("EPSG:3857"); // google

	// tool functions
	function createElement(tagName, attributes) {
		let element = $(document.createElement(tagName));
		if (attributes === undefined) return element;
		for (let attribute in attributes) {
			element.attr(attribute, attributes[attribute]);
		}
		return element;
	}

	function appendElement(parentElement, tagName, attributes) {
		if (attributes === undefined) attributes = {};
		let element = createElement(tagName, attributes);
		parentElement.append(element);
		return element;
	}


	// extract geojson from map element and clear map element's content
	jq_map = $(jq_map);
	let ext_path = jq_map.attr('data-ext-path'); // e.g. '/mediawiki/extensions/wrmap'
	let img_path = ext_path + '/img';
	let json_string = jq_map.children().last().text();
	jq_map.empty(); // once parsed, remove geojson string from the map element.
	let json_js = JSON.parse(json_string);
	let format_geojson = new ol.format.GeoJSON();
	let features_all = format_geojson.readFeatures(json_js, {dataProjection: EPSG4326, featureProjection: EPSG3857});


	// path layer
	// ----------

	function get_feature_title(feature) {
		let title = feature.get('type');
		if (title == 'sledrun') return feature.get('name');
		title = title.charAt(0).toUpperCase() + title.slice(1); // first letter uppercase
		if (feature.get('name')) title += ': ' + feature.get('name');
		return title;
	}

	// Returns 0 to 5 for features that represent sledruns as their condition
	let get_sledrun_condition = function(feature) {
		let condition = feature.get('condition');
		if (condition === undefined) return 0;
		return condition;
	}

	function sledrun_icon_style(condition, highlight) {
		let hl = highlight ? 'h' : 'n';
		let src = img_path + '/marker_c_sledrun_' + condition + 'n' + hl + '.png';
		return new ol.style.Style({
			image: new ol.style.Icon({
				src: src,
				imgSize: [17, 17],
				anchor: [0.5, 0.5]
			}),
		});

	}

	function sledrun_icon_shadow_style() {
		return new ol.style.Style({
			image: new ol.style.Icon({
				src: img_path + '/marker_c_shadow.png',
				imgSize: [23, 23],
				anchor: [0.4, 0.4]
			}),
		});
	}

	function marker_icon_style(feature) {
		let src = img_path + '/marker_p_' + feature.get('type') + '.png';
		return new ol.style.Style({
			image: new ol.style.Icon({
				src: src,
				imgSize: [20, 34],
				anchor: [0.5, 1.0]
			}),
		});
	}

	function point_style(feature, highlight) {
		let sledrun = feature.get('type') == 'sledrun';
		let icon_style;
		if (sledrun) {
			let condition = get_sledrun_condition(feature);
			icon_style = sledrun_icon_style(condition, highlight);
		} else icon_style = marker_icon_style(feature);
		if (highlight) {
			icon_style.setText(new ol.style.Text({
				text: get_feature_title(feature),
				font: 'icon',
				offsetY: 14,
				stroke: new ol.style.Stroke({
					color: '#ddd',
					width: 2,
				}),
			}));
		}
		if (sledrun) {
			let shadow_style = sledrun_icon_shadow_style();
			return [shadow_style, icon_style];
		}
		return [icon_style];
	}

	function style_point_function(feature, resolution) {
		return point_style(feature, false);
	}

	function style_point_function_highlight(feature, resolution) {
		return point_style(feature, true);
	}

	function style_path_function(feature, resolution) {
		let line_color = {
			'rodelbahn': '#014e9a',
			'gehweg': '#e98401',
			'alternative': '#7f7fff',
			'lift': '#000000',
			'anfahrt': '#e1e100'
		};
		let color = feature.get('strokeColor') || line_color[feature.get('type')] || '#e7525b';
		let width = (['lift', 'anfahrt'].indexOf(feature.get('type')) >= 0) ? 3 : 6;
		return new ol.style.Style({
			stroke: new ol.style.Stroke({
				color: color,
				width: width
			})
		});
	}

	function style_function(feature, resolution) {
		if (feature.getGeometry() instanceof ol.geom.Point) return style_point_function(feature, resolution);
		return style_path_function(feature, resolution);
	};

	function style_function_highlight(feature, resolution) {
		if (feature.getGeometry() instanceof ol.geom.Point) return style_point_function_highlight(feature, resolution);
		return style_path_function(feature, resolution);
	};


	// popup overlay
	// -------------
	let popup_container = document.getElementById('popup');
	let popup_content = document.getElementById('popup-content');
	let popup_closer = document.getElementById('popup-closer');
	let popup_overlay = new ol.Overlay({element: popup_container, autoPan: {animation: {duration: 250}}});
	popup_closer.onclick = function() {popup_overlay.setPosition(undefined); popup_closer.blur(); return false;};

	function create_popup_dom(feature) {
		let popup_div = createElement('div');

		// name
		if (feature.get('name') !== undefined && (feature.get('wiki') !== undefined || feature.get('thumb_url') !== undefined)) {
			let h2 = appendElement(popup_div, 'h2');
			if (feature.get('wiki') === undefined) h2.text(feature.get('name'));
			else appendElement(h2, 'a', {href: feature.get('wiki')}).text(feature.get('name'));
		}

		// sledrun information
		if (feature.get('type') == 'sledrun') {
			let p = appendElement(popup_div, 'p').text('Rodelbahnzustand').append(createElement('br'));
			if (feature.get('condition') !== undefined) {
				let condition_text = {1: 'Sehr gut', 2: 'Gut', 3: 'Mittelmäßig', 4: 'Schlecht', 5: 'Geht nicht'};
				let year_month_day = feature.get('date_report').split('-');
				p.append(createElement('a', {href: feature.get('wiki') + '#Eintr.C3.A4ge'}).text(condition_text[feature.get('condition')]), ' ');
				p.append(createElement('small').text(year_month_day[2] + '.' + year_month_day[1] + '.'), ' ');
				p.append(createElement('em').append(createElement('a', {href: feature.get('wiki') + '#Eintragen'}).text('Neu')));
			} else {
				p.append(createElement('em').append(createElement('a', {href: feature.get('wiki') + '#Eintragen'}).text('Bitte eintragen')));
			}
		}

		// wiki link
		if (feature.get('wiki') !== undefined) {
			let a = appendElement(appendElement(popup_div, 'p'), 'a', {href: feature.get('wiki')});
			let detail_text = 'Details';
			if (feature.get('type') == 'sledrun') detail_text += ' zur Rodelbahn';
			if (feature.get('type') == 'gasthaus') detail_text += ' zum Gasthaus';
			if (feature.get('thumb_url') === undefined) a.text(detail_text);
			else a.append(createElement('img', {src: feature.get('thumb_url'), alt: detail_text, title: detail_text}));
		}

		return popup_div;
	}


	// map itself
	// ----------
	let lon = json_js.properties.lon;
	let lat = json_js.properties.lat;
	let zoom = json_js.properties.zoom;
	let width = json_js.properties.width;
	let height = json_js.properties.height;
	if (zoom === undefined) zoom = 10; // default zoom
	if (width === undefined) width = '100%'; // default width
	if (height === undefined) height = 450;  // default: 450 pixel
	jq_map.width(width);
	jq_map.height(height);

	let layer_sledrun_source = new ol.source.Vector({features: features_all});
	let layer_sledrun = new ol.layer.Vector({
		source: layer_sledrun_source,
		style: style_function
	});

	let map = new ol.Map({
		target: jq_map[0],
		layers: [
			layer_sledrun
		],
		overlays: [popup_overlay],
		view: new ol.View({
			center: ol.proj.fromLonLat([lon, lat]),
			zoom: zoom
		}),
		controls: ol.control.defaults({
			attributionOptions: {
				collapsible: false
			}
		}),
		interactions: ol.interaction.defaults({
			mouseWheelZoom: false,
			dragPan: false,
		}).extend([
			new ol.interaction.DragPan({
				condition: function (event) {
					return this.getPointerCount() === 2 || ol.events.condition.platformModifierKeyOnly(event);
				},
			}),
			new ol.interaction.MouseWheelZoom({
				condition: ol.events.condition.platformModifierKeyOnly,
			}),
			new ol.interaction.Select({
				condition: ol.events.condition.pointerMove,
				style: style_function_highlight,
			})
		])
	});

	let select_click = new ol.interaction.Select({
		condition: ol.events.condition.click,
		style: false,
	});
	map.addInteraction(select_click);
	select_click.on('select', function(event) {
		if (event.selected.length > 0) {
			let feature = event.selected[0];
			let coordinates = feature.getGeometry().getCoordinates();
			let popup_dom = create_popup_dom(feature);
			if (popup_dom.children().length > 0) {
				$(popup_content).empty().append(popup_dom);
				popup_overlay.setPosition(coordinates);
			}
		}
	});


	// background layer
	// ----------------
	function get_austria_feature() {
		// simplified "inner" polygon of Austria, created with tools/austria_simplified.py
		let austria_wkt = 'POLYGON ((9.599 47.269, 9.767 47.523, 9.986 47.442, 10.192 47.234, 10.366 47.287, 10.488 47.497, ' +
			'10.814 47.477, 11.052 47.349, 11.732 47.539, 12.211 47.578, 12.269 47.656, 12.474 47.593, 12.676 47.622, ' +
			'12.839 47.471, 13.039 47.436, 13.120 47.661, 12.989 47.754, 13.019 47.900, 12.864 48.130, 13.419 48.328, ' +
			'13.516 48.523, 13.769 48.509, 13.867 48.699, 14.173 48.535, 14.726 48.561, 14.851 48.728, 14.983 48.751, ' +
			'15.036 48.954, 15.803 48.820, 16.041 48.711, 16.374 48.694, 16.496 48.754, 16.831 48.668, 16.800 48.376, ' +
			'17.050 48.001, 16.985 47.742, 16.583 47.795, 16.363 47.696, 16.605 47.538, 16.379 47.412, 16.402 47.043, ' +
			'15.994 46.879, 15.914 46.732, 14.874 46.649, 14.538 46.455, 12.501 46.715, 12.213 46.957, 12.267 47.065, ' +
			'12.181 47.126, 11.762 47.031, 11.220 47.018, 10.925 46.815, 10.520 46.900, 10.359 47.029, 10.134 46.899, ' +
			'9.674 47.095, 9.599 47.269))';
		let format = new ol.format.WKT();
		let feature = format.readFeature(austria_wkt, {
			dataProjection: EPSG4326,
			featureProjection: EPSG3857,
		});
		return feature;
	}

	// basemap.at layer
	let austria_feature = get_austria_feature();
	function is_in_austria(feature) {
		return austria_feature.getGeometry().intersectsCoordinate(feature.getGeometry().getFirstCoordinate());
	}
	let austria_only = features_all.every(is_in_austria);
	let capabilitiesUrl = austria_only ? 'https://maps.wien.gv.at/basemap/1.0.0/WMTSCapabilities.xml' : 'https://maps.wien.gv.at/vao/1.0.0/WMTSCapabilities.xml';
	fetch(capabilitiesUrl).then(function(response) {
		return response.text();
	}).then(function(text) {
		let result = new ol.format.WMTSCapabilities().read(text);
		let options = ol.source.WMTS.optionsFromCapabilities(result, {
			layer: austria_only ? 'bmapgrau' : 'vaoausland',
			matrixSet: 'google3857',
			style: 'normal',
		});
		options['attributions'] = austria_only ? 'Grundkarte: <a href="https://www.basemap.at/">basemap.at</a>' : 'Grundkarte: <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a>';
		let layer_map = new ol.layer.Tile({
			source: new ol.source.WMTS(options),
		});
		map.getLayers().insertAt(0, layer_map);
	});

	// // Alternatives:
	// // * OpenTopoMap (see https://opentopomap.org/about)
	// // * OSM
	// let layer_map = new ol.layer.Tile({
	//     source: new ol.source.OSM()
	// });
	// map.getLayers().insertAt(0, layer_map);
}


function init_wrmaps() {
	let jq_maps = $('.wrmap'); // all wrmap <div> elements
	jq_maps.each(init_wrmap);
}


$(document).ready(init_wrmaps);