/**
 * 手势坐标上下文与目标可见性的回归。三层canvas加独立子视图，验证祖先位置/缩放/身份变化何时取消预览。
 * 同时检查owner链读取缓存与未知祖先数据隔离；这里没有DOM指针捕获，测试的是core会话及placement读取器。
 */
import {test} from 'node:test';
import assert from 'node:assert/strict';
import {createGesturePlacementReader} from '../../src/lib/canvas-core/gesture-placement.ts';
import {createDocument,createRegistry,builtinComponents,createEditor,createSessions} from '../../src/lib/canvas-core/index.ts';
/** 合法100×100节点工厂，可指定owner和frame组件，用来搭建坐标链。 */
const node=(id,owner='root',componentId='text')=>({id,incarnation:1,structure:'node',componentId,dataVersion:1,ownerCanvasId:owner,data:{title:id,text:''},geometry:{x:0,y:0,width:100,height:100,rotation:0}});
/** 子canvas局部空间中的单个曲线点，连接手势用它验证owner祖先变化会失效路径预览。 */
const path={type:'bezier-chain',knots:[{id:'k',mode:'corner',position:{x:10,y:20},in:{x:-10,y:0},out:{x:10,y:0}}]};
/** root→child→grand由F/G入口连接，A/D及其边归child，B归grand；同时挂root与child-view比较坐标边界。 */
function fixture(){const registry=createRegistry(builtinComponents()),document=createDocument('p',[{id:'root',parent:null},{id:'child',parent:{canvasId:'root',entryElementId:'F'}},{id:'grand',parent:{canvasId:'child',entryElementId:'G'}}],[node('F','root','frame'),node('G','child','frame'),node('A','child'),node('B','grand'),node('D','child'),node('C'),{id:'edge',incarnation:1,structure:'connection',componentId:'connection',dataVersion:1,ownerCanvasId:'child',source:{elementId:'A'},target:{elementId:'D'},path,data:{}}]),editor=createEditor({document,registry}),sessions=createSessions(editor);sessions.attach('v','root');sessions.attach('child-view','child');return{editor,sessions};}
// 根视图预览B时移动祖先F，手势先取消；迟到commit拒绝且B的持久几何仍为0。
test('moving an ancestor cancels a descendant preview before a late commit can use old coordinates',()=>{const{editor,sessions}=fixture();assert.equal(sessions.begin('v',[{id:'B',incarnation:1}]).enabled,true);sessions.update('v',{id:'B',incarnation:1},{x:50});assert.equal(editor.dispatch({type:'element.geometry',target:{id:'F',incarnation:1},patch:{x:200}}).status,'applied');assert.equal(sessions.getSnapshot().gesture,null);const before=editor.getSnapshot();assert.equal(sessions.commit('v').status,'rejected');assert.strictEqual(editor.getSnapshot(),before);assert.equal(before.document.elements.get('B').geometry.x,0);});
// 折叠F隐藏A，独立child-view也不能编辑根节点C；分别断言target_hidden与target_outside_view。
test('collapsed and outside-view targets cannot acquire a gesture',()=>{const{editor,sessions}=fixture();editor.dispatch({type:'element.data',target:{id:'F',incarnation:1},patch:{presentation:{collapsed:true}}});assert.equal(sessions.begin('v',[{id:'A',incarnation:1}]).code,'target_hidden');assert.equal(sessions.begin('child-view',[{id:'C',incarnation:1}]).code,'target_outside_view');});
// 对child局部路径预览后移动F，连接手势必须取消，不能把旧路径坐标提交到新上下文。
test('moving a path owner ancestor cancels its connection preview',()=>{const{editor,sessions}=fixture();assert.equal(sessions.beginConnection('v',{id:'edge',incarnation:1}).enabled,true);sessions.updateConnection('v',{...path,knots:[]});assert.equal(editor.dispatch({type:'element.geometry',target:{id:'F',incarnation:1},patch:{x:200}}).status,'applied');assert.equal(sessions.getSnapshot().connectionGesture,null);});

// 分别改contentScale/unitScale/collapsed要求坐标失效；仅标签/标题或无关C几何改变则保留同一gesture对象。
test('scale and collapse cancel active descendant gestures but presentation labels do not',()=>{for(const presentation of [{contentScale:2},{unitScale:2},{collapsed:true}]){const{editor,sessions}=fixture();sessions.begin('v',[{id:'B',incarnation:1}]);sessions.update('v',{id:'B',incarnation:1},{x:50});editor.dispatch({type:'element.data',target:{id:'F',incarnation:1},patch:{presentation}});assert.equal(sessions.getSnapshot().gesture,null);assert.equal(sessions.getSnapshot().lastCancelReason,'coordinate_context_changed');}const{editor,sessions}=fixture();sessions.begin('v',[{id:'B',incarnation:1}]);const gesture=sessions.getSnapshot().gesture;editor.dispatch({type:'element.data',target:{id:'F',incarnation:1},patch:{title:'another title',presentation:{labelMode:'hidden',contentScale:1,unitScale:1}}});assert.strictEqual(sessions.getSnapshot().gesture,gesture);editor.dispatch({type:'element.geometry',target:{id:'C',incarnation:1},patch:{x:80}});assert.strictEqual(sessions.getSnapshot().gesture,gesture);});
// child-view以child为坐标根，上方F移动不影响本地B预览，commit仍可合法写x=50。
// 与根视图用例使用同一树，区别只有打开的视图根；由此隔离“上级元素变化”与“当前坐标上下文变化”。
test('ancestor changes above an independently opened view do not alter its local coordinate space',()=>{const{editor,sessions}=fixture();sessions.begin('child-view',[{id:'B',incarnation:1}]);sessions.update('child-view',{id:'B',incarnation:1},{x:50});const gesture=sessions.getSnapshot().gesture;editor.dispatch({type:'element.geometry',target:{id:'F',incarnation:1},patch:{x:200}});assert.strictEqual(sessions.getSnapshot().gesture,gesture);assert.equal(sessions.commit('child-view').status,'applied');assert.equal(editor.getSnapshot().document.elements.get('B').geometry.x,50);});
// 祖先生命周期、未来版本或同几何换owner都改变上下文；即使像素位置看似一致，也必须取消旧手势。
test('ancestor restore, future version and equal-geometry reparent invalidate the old context',()=>{for(const patch of [{incarnation:2},{dataVersion:99}]){const{editor,sessions}=fixture();sessions.begin('v',[{id:'B',incarnation:1}]);const before=editor.getSnapshot(),document=createDocument('p',[...before.document.canvases.values()],[...before.document.elements.values()].map(record=>record.id==='F'?{...record,...patch}:record));assert.equal(editor.reconcile(document,undefined,before.rootRevision).status,'applied');assert.equal(sessions.getSnapshot().gesture,null);}const{editor,sessions}=fixture();editor.transaction(tx=>{tx.dispatch({type:'element.create',element:{...node('H','root','frame'),geometry:{...node('H').geometry,x:-24,y:-36}}});tx.dispatch({type:'canvas.create',canvas:{id:'sibling',parent:{canvasId:'root',entryElementId:'H'}}});});sessions.begin('v',[{id:'B',incarnation:1}]);assert.equal(editor.dispatch({type:'element.move',target:{id:'F',incarnation:1},canvasId:'sibling',geometry:node('F').geometry}).status,'applied');assert.equal(sessions.getSnapshot().gesture,null);});
// 目标A由text变plain-text后旧预览取消，理由target_changed，不能只凭相同ID保留租约。
test('direct target component changes cannot retain an old geometry lease',()=>{const{editor,sessions}=fixture();sessions.begin('v',[{id:'A',incarnation:1}]);sessions.update('v',{id:'A',incarnation:1},{x:50});const before=editor.getSnapshot(),document=createDocument('p',[...before.document.canvases.values()],[...before.document.elements.values()].map(record=>record.id==='A'?{...record,componentId:'plain-text'}:record));assert.equal(editor.reconcile(document,undefined,before.rootRevision).status,'applied');assert.equal(sessions.getSnapshot().gesture,null);assert.equal(sessions.getSnapshot().lastCancelReason,'target_changed');});
// 删除F使child-view回退root，订阅只收到一次同时包含视图变更与手势取消的快照。
test('deleting the viewed canvas publishes its root fallback and cancellation together',()=>{const{editor,sessions}=fixture();sessions.begin('child-view',[{id:'B',incarnation:1}]);const events=[];sessions.subscribe(()=>events.push(sessions.getSnapshot()));assert.equal(editor.dispatch({type:'element.remove',target:{id:'F',incarnation:1}}).status,'applied');assert.equal(events.length,1);assert.equal(events[0].views.get('child-view').canvasId,'root');assert.equal(events[0].gesture,null);assert.equal(events[0].lastCancelReason,'canvas_changed');});


// 用禁止遍历的表包络读取grand链，1000次复用同一结果且仅两次元素get，验证按链而非全图扫描。
test('placement readers share a checked owner chain and never enumerate the project',()=>{const{editor}=fixture(),document=editor.getSnapshot().document;let reads=0;const protectedDocument={...document,canvases:{has:id=>document.canvases.has(id),get:id=>document.canvases.get(id),[Symbol.iterator](){throw Error('project enumeration');}},elements:{get(id){reads++;return document.elements.get(id);},[Symbol.iterator](){throw Error('project enumeration');}}},read=createGesturePlacementReader(protectedDocument,'root',editor.registry),first=read('grand');assert.equal(first.length,2);for(let i=0;i<1000;i++)assert.strictEqual(read('grand'),first);assert.equal(reads,2);});
// 未来版本F的data getter一读就抛错；placement应以target_hidden拒绝且getter读取数为0。
test('future ancestor data is never interpreted to decide visibility',()=>{const{editor}=fixture(),document=editor.getSnapshot().document,frame=document.elements.get('F');let inspected=0;const opaque={...frame,dataVersion:99,get data(){inspected++;throw Error('opaque payload read');}},elements=new Map(document.elements);elements.set('F',opaque);const read=createGesturePlacementReader({...document,elements},'root',editor.registry);assert.throws(()=>read('grand'),/target_hidden/);assert.equal(inspected,0);});