/* Wereldoriëntatie: echte soortfoto's en geografisch correcte topografie. */
"use strict";

const WORLD_MEDIA_ROOT="img/world/";
const worldMedia=(file,author,license,source)=>Object.freeze({file,author,license,source});
const WORLD_MEDIA=Object.freeze({
 oak:{
  tree:worldMedia("trees/oak.webp","AnemoneProjectors","CC BY-SA 2.0","https://commons.wikimedia.org/wiki/File:1._English_Oak_(Quercus_robur)_(3607652442).jpg"),
  leaf:worldMedia("leaves/oak.webp","Rasbak","CC BY-SA 3.0","https://commons.wikimedia.org/wiki/File:Zomereik_blad_Quercus_robur.jpg"),
 },
 birch:{
  tree:worldMedia("trees/birch.webp","Maplan","CC BY-SA 3.0","https://commons.wikimedia.org/wiki/File:Betula_pendula_winter.jpg"),
  leaf:worldMedia("leaves/birch.webp","Joanna Boisse","CC BY-SA 4.0","https://commons.wikimedia.org/wiki/File:Atlas_roslin_pl_Brzoza_brodawkowata_1393_6470.jpg"),
 },
 horse_chestnut:{
  tree:worldMedia("trees/horse-chestnut.webp","Toubib","CC BY-SA 3.0","https://commons.wikimedia.org/wiki/File:Paardenkastanje2.jpg"),
  leaf:worldMedia("leaves/horse-chestnut.webp","Tournasol7","CC BY 4.0","https://commons.wikimedia.org/wiki/File:Aesculus_hippocastanum_in_botanical_garden_of_UKW_Bydgoszcz_(2).jpg"),
 },
 pine:{
  tree:worldMedia("trees/pine.webp","Hello, I am Bruce","CC BY-SA 2.0","https://commons.wikimedia.org/wiki/File:Pinus_sylvestris_Glenmuick.jpg"),
  leaf:worldMedia("leaves/pine.webp","AnRo0002","CC0 1.0","https://commons.wikimedia.org/wiki/File:20151215Pinus_sylvestris2.jpg"),
 },
 beech:{
  tree:worldMedia("trees/beech.webp","Emőke Dénes","CC BY-SA 4.0","https://commons.wikimedia.org/wiki/File:Fagales_-_Fagus_sylvatica.jpg"),
  leaf:worldMedia("leaves/beech.webp","AnRo0002","CC0 1.0","https://commons.wikimedia.org/wiki/File:20130530Hain_Rotbuche.jpg"),
 },
 maple:{
  tree:worldMedia("trees/maple.webp","MPF","CC BY-SA 3.0","https://commons.wikimedia.org/wiki/File:Acer-pseudoplatanus.jpg"),
  leaf:worldMedia("leaves/maple.webp","Willow","CC BY 2.5","https://commons.wikimedia.org/wiki/File:Acer_pseudoplatanus_003.jpg"),
 },
 willow:{
  tree:worldMedia("trees/willow.webp","Burkhard Mücke","CC BY-SA 4.0","https://commons.wikimedia.org/wiki/File:Salix_alba_an_der_Isar.jpg"),
  leaf:worldMedia("leaves/willow.webp","AnRo0002","CC0 1.0","https://commons.wikimedia.org/wiki/File:20160721Salix_alba1.jpg"),
 },
 alder:{
  tree:worldMedia("trees/alder.webp","Willow","CC BY 2.5","https://commons.wikimedia.org/wiki/File:Alnus_glutinosa_011.jpg"),
  leaf:worldMedia("leaves/alder.webp","AnRo0002","CC0 1.0","https://commons.wikimedia.org/wiki/File:20200531Alnus_glutinosa2.jpg"),
 },
 robin:{bird:worldMedia("birds/robin.webp","Rasbak","CC BY-SA 3.0","https://commons.wikimedia.org/wiki/File:Erithacus_rubecula,_Roodborstje.jpg")},
 great_tit:{bird:worldMedia("birds/great-tit.webp","Sławek Staszczuk","CC BY-SA 3.0","https://commons.wikimedia.org/wiki/File:Parus_major_m.jpg")},
 blackbird:{bird:worldMedia("birds/blackbird.webp","Malene Thyssen","CC BY-SA 3.0","https://commons.wikimedia.org/wiki/File:Solsort.jpg")},
 mallard:{bird:worldMedia("birds/mallard.webp","Mbdortmund","CC BY 3.0","https://commons.wikimedia.org/wiki/File:Duisburg_10401IMG_0401.JPG")},
 blue_tit:{bird:worldMedia("birds/blue-tit.webp","Luc Viatour","CC BY-SA 3.0","https://commons.wikimedia.org/wiki/File:Cyanistes_caeruleus_3_Luc_Viatour.jpg")},
 house_sparrow:{bird:worldMedia("birds/house-sparrow.webp","JrPol","CC BY-SA 4.0","https://commons.wikimedia.org/wiki/File:Huismus,_man.jpg")},
 magpie:{bird:worldMedia("birds/magpie.webp","Dion Art","CC BY-SA 4.0","https://commons.wikimedia.org/wiki/File:%D0%A1%D0%BE%D1%80%D0%BE%D0%BA%D0%B0_(Pica_pica),_%D0%9A%D0%B0%D0%BB%D0%B8%D0%BD%D0%B8%D0%BD%D0%B3%D1%80%D0%B0%D0%B4.jpg")},
 woodpecker:{bird:worldMedia("birds/woodpecker.webp","Usitea","CC BY-SA 3.0","https://commons.wikimedia.org/wiki/File:Grote_bonte_specht.JPG")},
});

const WORLD_TREES=Object.freeze([
 {id:"oak",nl:"Zomereik",en:"Pedunculate oak",latin:"Quercus robur",tier:1,hintNl:"Brede kroon, diep gelobde bladeren en eikels aan een steeltje.",hintEn:"Broad crown, deeply lobed leaves and acorns on a stalk."},
 {id:"birch",nl:"Ruwe berk",en:"Silver birch",latin:"Betula pendula",tier:1,hintNl:"Witte bast met donkere strepen en driehoekige, gezaagde blaadjes.",hintEn:"White bark with dark markings and triangular, serrated leaves."},
 {id:"horse_chestnut",nl:"Witte paardenkastanje",en:"Horse chestnut",latin:"Aesculus hippocastanum",tier:1,hintNl:"Vijf tot zeven grote blaadjes vormen samen één handvormig blad.",hintEn:"Five to seven large leaflets form one hand-shaped leaf."},
 {id:"pine",nl:"Grove den",en:"Scots pine",latin:"Pinus sylvestris",tier:1,hintNl:"Oranjebruine schors bovenin; de blauwgroene naalden staan per twee.",hintEn:"Orange-brown upper bark; blue-green needles grow in pairs."},
 {id:"beech",nl:"Beuk",en:"European beech",latin:"Fagus sylvatica",tier:2,hintNl:"Gladde grijze stam en glanzende ovale bladeren met een golvende rand.",hintEn:"Smooth grey trunk and glossy oval leaves with a wavy edge."},
 {id:"maple",nl:"Gewone esdoorn",en:"Sycamore maple",latin:"Acer pseudoplatanus",tier:2,hintNl:"Groot handvormig blad met vijf puntige lobben en gevleugelde zaden.",hintEn:"Large hand-shaped leaf with five pointed lobes and winged seeds."},
 {id:"willow",nl:"Schietwilg",en:"White willow",latin:"Salix alba",tier:3,hintNl:"Brede, losse kroon en lange smalle bladeren met een zilverige onderkant.",hintEn:"Broad open crown and long narrow leaves with a silvery underside."},
 {id:"alder",nl:"Zwarte els",en:"Black alder",latin:"Alnus glutinosa",tier:3,hintNl:"Ronde bladeren met een ingedeukte top en kleine houtige elzenproppen.",hintEn:"Rounded leaves with a notched tip and small woody alder cones."},
]);

const WORLD_BIRDS=Object.freeze([
 {id:"robin",nl:"Roodborst",en:"European robin",latin:"Erithacus rubecula",tier:1,hintNl:"Oranjerode borst en gezicht, met een olijfbruine rug.",hintEn:"Orange-red breast and face with an olive-brown back."},
 {id:"great_tit",nl:"Koolmees",en:"Great tit",latin:"Parus major",tier:1,hintNl:"Zwarte kop, witte wangen en een zwarte streep over de gele buik.",hintEn:"Black head, white cheeks and a black stripe down the yellow belly."},
 {id:"blackbird",nl:"Merel",en:"Common blackbird",latin:"Turdus merula",tier:1,hintNl:"Het mannetje is helemaal zwart met een gele snavel en gele oogring.",hintEn:"The male is all black with a yellow bill and yellow eye-ring."},
 {id:"mallard",nl:"Wilde eend",en:"Mallard",latin:"Anas platyrhynchos",tier:1,hintNl:"Het mannetje heeft een groene kop, witte halsring en kastanjebruine borst.",hintEn:"The male has a green head, white neck ring and chestnut breast."},
 {id:"blue_tit",nl:"Pimpelmees",en:"Blue tit",latin:"Cyanistes caeruleus",tier:2,hintNl:"Blauw petje en vleugels, witte wangen en een gele buik.",hintEn:"Blue cap and wings, white cheeks and a yellow belly."},
 {id:"house_sparrow",nl:"Huismus",en:"House sparrow",latin:"Passer domesticus",tier:2,hintNl:"Bruin gestreepte rug; het mannetje heeft een grijze kruin en zwarte bef.",hintEn:"Brown streaked back; the male has a grey crown and black bib."},
 {id:"magpie",nl:"Ekster",en:"Eurasian magpie",latin:"Pica pica",tier:3,hintNl:"Zwart-wit verenkleed met blauwgroene glans en een opvallend lange staart.",hintEn:"Black-and-white plumage with a blue-green sheen and a very long tail."},
 {id:"woodpecker",nl:"Grote bonte specht",en:"Great spotted woodpecker",latin:"Dendrocopos major",tier:3,hintNl:"Zwart-wit met rode veren onder de staart; het mannetje heeft rood in de nek.",hintEn:"Black and white with red beneath the tail; the male has red on the nape."},
]);

const NL_PROVINCES=Object.freeze([
 {id:"friesland",shape:"friesland",nl:"Friesland",en:"Friesland",capital:"leeuwarden",tier:2,color:"#93c5fd",x:518,y:166},
 {id:"groningen",shape:"groningen",nl:"Groningen",en:"Groningen",capital:"groningen_city",tier:2,color:"#fca5a5",x:615,y:72},
 {id:"drenthe",shape:"drenthe",nl:"Drenthe",en:"Drenthe",capital:"assen",tier:3,color:"#fde68a",x:611,y:222},
 {id:"overijssel",shape:"overijssel",nl:"Overijssel",en:"Overijssel",capital:"zwolle",tier:2,color:"#c4b5fd",x:598,y:351},
 {id:"flevoland",shape:"flevoland",nl:"Flevoland",en:"Flevoland",capital:"lelystad",tier:3,color:"#fdba74",x:465,y:272},
 {id:"noord_holland",shape:"noord-holland",nl:"Noord-Holland",en:"North Holland",capital:"haarlem",tier:1,color:"#f9a8d4",x:308,y:244},
 {id:"utrecht",shape:"utrecht",nl:"Utrecht",en:"Utrecht",capital:"utrecht_city",tier:1,color:"#d8b4fe",x:393,y:471},
 {id:"gelderland",shape:"gelderland",nl:"Gelderland",en:"Gelderland",capital:"arnhem",tier:1,color:"#86efac",x:493,y:452},
 {id:"zuid_holland",shape:"zuid-holland",nl:"Zuid-Holland",en:"South Holland",capital:"den_haag",tier:1,color:"#67e8f9",x:245,y:451},
 {id:"zeeland",shape:"zeeland",nl:"Zeeland",en:"Zeeland",capital:"middelburg",tier:3,color:"#5eead4",x:132,y:698},
 {id:"noord_brabant",shape:"noord-brabant",nl:"Noord-Brabant",en:"North Brabant",capital:"den_bosch",tier:1,color:"#fcd34d",x:367,y:599},
 {id:"limburg",shape:"limburg",nl:"Limburg",en:"Limburg",capital:"maastricht",tier:1,color:"#a7f3d0",x:489,y:714},
]);

const NL_CITIES=Object.freeze([
 {id:"leeuwarden",nl:"Leeuwarden",en:"Leeuwarden",province:"friesland",capital:true,tier:2,x:467,y:119},
 {id:"groningen_city",nl:"Groningen",en:"Groningen",province:"groningen",capital:true,tier:2,x:612,y:112},
 {id:"assen",nl:"Assen",en:"Assen",province:"drenthe",capital:true,tier:3,x:612,y:175},
 {id:"zwolle",nl:"Zwolle",en:"Zwolle",province:"overijssel",capital:true,tier:2,x:538,y:332},
 {id:"lelystad",nl:"Lelystad",en:"Lelystad",province:"flevoland",capital:true,tier:3,x:417,y:327},
 {id:"haarlem",nl:"Haarlem",en:"Haarlem",province:"noord_holland",capital:true,tier:1,x:261,y:371},
 {id:"utrecht_city",nl:"Utrecht",en:"Utrecht",province:"utrecht",capital:true,tier:1,x:355,y:460},
 {id:"arnhem",nl:"Arnhem",en:"Arnhem",province:"gelderland",capital:true,tier:1,x:500,y:486},
 {id:"den_haag",nl:"Den Haag",en:"The Hague",province:"zuid_holland",capital:true,tier:1,x:192,y:460,side:"left"},
 {id:"middelburg",nl:"Middelburg",en:"Middelburg",province:"zeeland",capital:true,tier:3,x:65,y:635},
 {id:"den_bosch",nl:"'s-Hertogenbosch",en:"'s-Hertogenbosch",province:"noord_brabant",capital:true,tier:1,x:388,y:577},
 {id:"maastricht",nl:"Maastricht",en:"Maastricht",province:"limburg",capital:true,tier:1,x:463,y:836},
 {id:"amsterdam",nl:"Amsterdam",en:"Amsterdam",province:"noord_holland",capital:false,tier:1,x:311,y:373},
 {id:"rotterdam",nl:"Rotterdam",en:"Rotterdam",province:"zuid_holland",capital:false,tier:1,x:234,y:508},
 {id:"eindhoven",nl:"Eindhoven",en:"Eindhoven",province:"noord_brabant",capital:false,tier:1,x:424,y:653},
 {id:"nijmegen",nl:"Nijmegen",en:"Nijmegen",province:"gelderland",capital:false,tier:1,x:497,y:536},
 {id:"enschede",nl:"Enschede",en:"Enschede",province:"overijssel",capital:false,tier:2,x:688,y:409,side:"left"},
 {id:"alkmaar",nl:"Alkmaar",en:"Alkmaar",province:"noord_holland",capital:false,tier:2,x:283,y:296},
 {id:"breda",nl:"Breda",en:"Breda",province:"noord_brabant",capital:false,tier:3,x:286,y:611,side:"left"},
 {id:"tilburg",nl:"Tilburg",en:"Tilburg",province:"noord_brabant",capital:false,tier:3,x:347,y:625},
]);

const worldName=item=>LANG==="nl"?item.nl:item.en;
const worldHint=item=>LANG==="nl"?item.hintNl:item.hintEn;
const worldShuffle=items=>{
 const copy=[...items];
 for(let i=copy.length-1;i>0;i--){
  const j=Math.floor(Math.random()*(i+1));
  [copy[i],copy[j]]=[copy[j],copy[i]];
 }
 return copy;
};
const worldSelect=(value,items)=>{
 const select=document.createElement("select");
 items.forEach(([id,key])=>select.add(new Option(T(key),id)));
 select.value=value;
 return select;
};
const worldLevelPool=(items,level)=>items.filter(item=>item.tier<=level);

function worldPhoto(item,type,view){
 const kind=type==="birds"?"bird":view;
 const media=WORLD_MEDIA[item.id]?.[kind];
 const figure=document.createElement("figure");
 figure.className="world-photo world-photo-"+kind;
 const image=document.createElement("img");
 image.className="world-picture";
 image.alt=T(kind==="bird"?"worldPhotoBird":kind==="leaf"?"worldPhotoLeaf":"worldPhotoTree");
 image.draggable=false;
 image.loading="lazy";
 image.decoding="async";
 image.src=WORLD_MEDIA_ROOT+media.file;
 const badge=document.createElement("span");
 badge.className="world-photo-badge";
 badge.textContent=T(kind==="bird"?"worldPhotoBird":kind==="leaf"?"worldPhotoLeaf":"worldPhotoTree");
 const credit=document.createElement("a");
 credit.className="world-photo-credit";
 credit.href=media.source;
 credit.target="_blank";
 credit.rel="noopener noreferrer";
 credit.textContent=T("worldPhotoCredit").replace("{author}",media.author).replace("{license}",media.license);
 figure.append(image,badge,credit);
 return figure;
}

function worldVisual(item,type,view){
 const visual=document.createElement("div");
 visual.className="world-visual "+type+(view==="mixed"?" mixed":"");
 if(type==="trees"&&view==="mixed")visual.append(worldPhoto(item,type,"tree"),worldPhoto(item,type,"leaf"));
 else visual.append(worldPhoto(item,type,view));
 return visual;
}

function worldIdentity(item){
 const identity=document.createElement("div");
 identity.className="world-identity";
 const name=document.createElement("h3");
 name.textContent=worldName(item);
 const latin=document.createElement("em");
 latin.textContent=item.latin;
 identity.append(name,latin);
 return identity;
}

function mountWorldQuiz(root,init,config){
 const S=Object.assign({
  activity:"quiz",level:1,view:config.type==="trees"?"mixed":"bird",
  score:0,streak:0,target:"",taskView:"",options:[],solved:false,feedback:"",
 },init||{});
 S.level=Math.max(1,Math.min(3,+S.level||1));
 const activity=worldSelect(S.activity,[["learn","worldLearn"],["quiz","worldQuiz"]]);
 const level=worldSelect(String(S.level),[["1","lvl1"],["2","lvl2"],["3","lvl3"]]);
 const stage=document.createElement("div");
 const settings=[field(T("worldActivity"),activity),field(T("worldLevel"),level)];
 let view;
 if(config.type==="trees"){
  view=worldSelect(S.view,[["tree","worldTreeWhole"],["leaf","worldTreeLeaf"],["mixed","worldTreeMixed"]]);
  settings.push(field(T("worldTreeView"),view));
 }
 const pool=()=>worldLevelPool(config.items,S.level);
 const current=()=>config.items.find(item=>item.id===S.target)||pool()[0];
 const newTask=()=>{
  const items=pool(),previous=S.target;
  let target=items[Math.floor(Math.random()*items.length)];
  if(items.length>1)while(target.id===previous)target=items[Math.floor(Math.random()*items.length)];
  S.target=target.id;
  S.taskView=config.type==="trees"?(S.view==="mixed"?(Math.random()<.5?"tree":"leaf"):S.view):"bird";
  S.options=worldShuffle([target,...worldShuffle(items.filter(item=>item.id!==target.id)).slice(0,3)]).map(item=>item.id);
  S.solved=false;
  S.feedback="";
  draw();
 };
 const answer=id=>{
  if(S.solved)return;
  if(id===S.target){
   S.solved=true;S.feedback="good";S.score++;S.streak++;sndGood();
  }else{
   S.feedback="bad";S.streak=0;sndBad();
  }
  draw();
 };
 const gallery=()=>{
  const grid=document.createElement("div");
  grid.className="world-gallery";
  pool().forEach(item=>{
   const card=document.createElement("article");
   card.className="world-specimen";
   card.append(worldVisual(item,config.type,config.type==="trees"?S.view:"bird"),worldIdentity(item));
   const hint=document.createElement("p");
   hint.textContent=worldHint(item);
   card.append(hint);
   grid.append(card);
  });
  return grid;
 };
 function draw(){
  S.activity=activity.value;
  S.level=+level.value;
  if(view)S.view=view.value;
  stage.className="world-app";
  stage.innerHTML="";
  const top=document.createElement("div");
  top.className="world-top";
  const title=document.createElement("strong");
  title.textContent=T("wg_"+config.type);
  const score=document.createElement("span");
  score.textContent=T("worldScore").replace("{score}",S.score).replace("{streak}",S.streak);
  top.append(title,score);
  stage.append(top);
  if(S.activity==="learn"){
   const intro=document.createElement("p");
   intro.className="world-intro";
   intro.textContent=T("worldExploreHint");
   stage.append(intro,gallery());
   return;
  }
  const item=current(),card=document.createElement("section");
  card.className="world-task-card";
  const question=document.createElement("h3");
  question.textContent=T(config.type==="birds"?"worldQuestionBird":S.taskView==="leaf"?"worldQuestionLeaf":"worldQuestionTree");
  card.append(question,worldVisual(item,config.type,S.taskView));
  const answers=document.createElement("div");
  answers.className="world-answers";
  S.options.forEach(id=>{
   const option=config.items.find(entry=>entry.id===id);
   if(!option)return;
   const button=btn(worldName(option),()=>answer(id));
   if(S.solved&&id===S.target)button.classList.add("correct");
   answers.append(button);
  });
  card.append(answers);
  const feedback=document.createElement("p");
  feedback.className="world-feedback "+(S.feedback==="good"?"ok":S.feedback?"bad":"");
  feedback.setAttribute("role","status");
  if(S.feedback)feedback.textContent=T(S.feedback==="good"?"worldCorrect":"worldTryAgain");
  card.append(feedback);
  const actions=document.createElement("div");
  actions.className="world-actions";
  actions.append(btn(T("worldNext"),newTask,"ghost"));
  card.append(actions);
  if(S.solved){
   const fact=document.createElement("div");
   fact.className="world-fact";
   fact.append(worldIdentity(item));
   const hint=document.createElement("p");
   hint.textContent=worldHint(item);
   fact.append(hint);
   card.append(fact);
  }
  stage.append(card);
 }
 activity.onchange=()=>{S.activity=activity.value;if(S.activity==="quiz")newTask();else draw()};
 level.onchange=()=>{S.level=+level.value;if(S.activity==="quiz")newTask();else draw()};
 if(view)view.onchange=()=>{S.view=view.value;if(S.activity==="quiz")newTask();else draw()};
 learningShell(root,settings,stage);
 if(S.activity==="quiz")newTask();else draw();
 return{getState:()=>({...S,options:[...S.options]})};
}

function mountTrees(root,init){return mountWorldQuiz(root,init,{type:"trees",items:WORLD_TREES})}
function mountBirds(root,init){return mountWorldQuiz(root,init,{type:"birds",items:WORLD_BIRDS})}

const SVG_NS="http://www.w3.org/2000/svg";
const TOPO_MAP_ASSET=WORLD_MEDIA_ROOT+"netherlands-provinces.svg";
const TOPO_MAP_SOURCE="https://commons.wikimedia.org/wiki/File:Netherlands_provinces_map_blank.svg";
function svgNode(name,attributes={}){
 const node=document.createElementNS(SVG_NS,name);
 Object.entries(attributes).forEach(([key,value])=>node.setAttribute(key,value));
 return node;
}
function svgAction(node,label,action){
 node.setAttribute("role","button");
 node.setAttribute("tabindex","0");
 node.setAttribute("aria-label",label);
 node.addEventListener("click",action);
 node.addEventListener("keydown",event=>{
  if(event.key==="Enter"||event.key===" "){
   event.preventDefault();
   action();
  }
 });
}

function makeTopoMap(mode,pool,onPick,showLabels,picked,target){
 const wrap=document.createElement("div");
 wrap.className="topo-map-wrap";
 const svg=svgNode("svg",{
  class:"topo-map",viewBox:"0 0 743 881",
  role:onPick?"group":"img","aria-label":T("topoMapLabel"),
 });
 svg.append(svgNode("rect",{x:0,y:0,width:743,height:881,rx:34,class:"topo-water"}));
 NL_PROVINCES.forEach(province=>{
  const shape=svgNode("use",{
   href:TOPO_MAP_ASSET+"#"+province.shape,
   fill:province.color,
   class:"topo-province"+(province.id===target?" target":"")+(province.id===picked?" picked":""),
   "data-id":province.id,
  });
  const title=svgNode("title");
  title.textContent=worldName(province);
  shape.append(title);
  if(onPick&&mode==="provinces")svgAction(shape,worldName(province),()=>onPick(province.id));
  svg.append(shape);
  if(showLabels&&mode==="provinces"&&pool.some(item=>item.id===province.id)){
   const label=svgNode("text",{x:province.x,y:province.y,class:"topo-label"});
   label.textContent=worldName(province);
   svg.append(label);
  }
 });
 if(mode!=="provinces")pool.forEach(city=>{
  const group=svgNode("g",{
   class:"topo-marker"+(city.id===target?" target":"")+(city.id===picked?" picked":""),
  });
  const hit=svgNode("circle",{cx:city.x,cy:city.y,r:24,class:"topo-hit"});
  const dot=svgNode("circle",{cx:city.x,cy:city.y,r:10,class:"topo-dot"});
  group.append(hit,dot);
  if(showLabels){
   const left=city.side==="left";
   const label=svgNode("text",{
    x:city.x+(left?-16:16),y:city.y-13,
    class:"topo-city-label"+(left?" left":""),
   });
   label.textContent=worldName(city);
   group.append(label);
  }
  if(onPick)svgAction(group,worldName(city),()=>onPick(city.id));
  svg.append(group);
 });
 const source=document.createElement("a");
 source.className="topo-source";
 source.href=TOPO_MAP_SOURCE;
 source.target="_blank";
 source.rel="noopener noreferrer";
 source.textContent=T("topoMapSource");
 wrap.append(svg,source);
 return wrap;
}

function mountTopography(root,init){
 const S=Object.assign({
  activity:"quiz",mode:"provinces",level:1,score:0,streak:0,
  target:"",picked:"",solved:false,feedback:"",
 },init||{});
 S.level=Math.max(1,Math.min(3,+S.level||1));
 const activity=worldSelect(S.activity,[["learn","worldLearn"],["quiz","worldQuiz"]]);
 const mode=worldSelect(S.mode,[["provinces","topoProvinces"],["capitals","topoCapitals"],["cities","topoCities"]]);
 const level=worldSelect(String(S.level),[["1","lvl1"],["2","lvl2"],["3","lvl3"]]);
 const stage=document.createElement("div");
 const pool=()=>S.mode==="provinces"
  ?NL_PROVINCES.filter(item=>item.tier<=S.level)
  :S.mode==="capitals"
   ?NL_CITIES.filter(item=>item.capital&&item.tier<=S.level)
   :NL_CITIES.filter(item=>!item.capital&&item.tier<=S.level);
 const current=()=>pool().find(item=>item.id===S.target)||pool()[0];
 const newTask=()=>{
  const items=pool(),previous=S.target;
  let target=items[Math.floor(Math.random()*items.length)];
  if(items.length>1)while(target.id===previous)target=items[Math.floor(Math.random()*items.length)];
  S.target=target.id;S.picked="";S.solved=false;S.feedback="";
  draw();
 };
 const answer=id=>{
  if(S.solved)return;
  S.picked=id;
  if(id===S.target){
   S.solved=true;S.feedback="good";S.score++;S.streak++;sndGood();
  }else{
   S.feedback="bad";S.streak=0;sndBad();
  }
  draw();
 };
 function draw(){
  S.activity=activity.value;S.mode=mode.value;S.level=+level.value;
  stage.className="world-app topo-app";
  stage.innerHTML="";
  const top=document.createElement("div");
  top.className="world-top";
  const title=document.createElement("strong");
  title.textContent=T("wg_topography");
  const score=document.createElement("span");
  score.textContent=T("worldScore").replace("{score}",S.score).replace("{streak}",S.streak);
  top.append(title,score);
  stage.append(top);
  const card=document.createElement("section");
  card.className="world-task-card topo-card";
  if(S.activity==="learn"){
   const intro=document.createElement("p");
   intro.className="world-intro";
   intro.textContent=T("topoExploreHint");
   card.append(intro,makeTopoMap(S.mode,pool(),null,true,"",""));
  }else{
   const item=current(),question=document.createElement("h3");
   question.textContent=T(S.mode==="provinces"?"topoFindProvince":S.mode==="capitals"?"topoFindCapital":"topoFindCity").replace("{name}",worldName(item));
   card.append(question,makeTopoMap(S.mode,pool(),answer,S.solved,S.picked,S.solved?S.target:""));
   const feedback=document.createElement("p");
   feedback.className="world-feedback "+(S.feedback==="good"?"ok":S.feedback?"bad":"");
   feedback.setAttribute("role","status");
   if(S.feedback)feedback.textContent=T(S.feedback==="good"?"worldCorrect":"worldTryAgain");
   const actions=document.createElement("div");
   actions.className="world-actions";
   actions.append(btn(T("worldNext"),newTask,"ghost"));
   card.append(feedback,actions);
  }
  stage.append(card);
 }
 activity.onchange=()=>{S.activity=activity.value;if(S.activity==="quiz")newTask();else draw()};
 mode.onchange=()=>{S.mode=mode.value;if(S.activity==="quiz")newTask();else draw()};
 level.onchange=()=>{S.level=+level.value;if(S.activity==="quiz")newTask();else draw()};
 learningShell(root,[
  field(T("worldActivity"),activity),
  field(T("topoMode"),mode),
  field(T("worldLevel"),level),
 ],stage);
 if(S.activity==="quiz")newTask();else draw();
 return{getState:()=>({...S})};
}