/**
 * 键盘输入路由的纯逻辑回归。通过上下文标记和简化closest/composedPath对象，测试输入优先级而不创建真实浏览器DOM。
 * 回调计数用于确认被文本/IME/浮层认领的事件不会继续触发文档快捷键。
 */
import {test} from 'node:test';import assert from 'node:assert/strict';
import {routeCanvasKey,canvasKeyContext} from '../../src/lib/canvas-bindings/input-router.ts';
// 逐个设置textEditing/composing/overlay/defaultPrevented，Backspace必须在动作层之前退出，gesture与shortcut调用数都为0。
test('text, IME, overlays and already consumed input never execute document shortcuts',()=>{for(const flags of [{textEditing:true},{composing:true},{overlay:true},{defaultPrevented:true}]){let calls=0;const result=routeCanvasKey({key:'Backspace',...flags},{gesture:()=>{calls++;return true;},shortcut:()=>{calls++;return true;}});assert.equal(calls,0);assert.ok(['text','overlay','unclaimed'].includes(result));}});
// 依次让gesture/tool/shortcut成为首个赢家，只运行到认领层；无处理器返回unclaimed。
test('gesture then tool then shortcut claim once; declining handlers fall through',()=>{for(const winner of ['gesture','tool','shortcut']){const calls=[];const handlers=Object.fromEntries(['gesture','tool','shortcut'].map(layer=>[layer,()=>{calls.push(layer);return layer===winner;}]));assert.equal(routeCanvasKey({key:'Escape'},handlers),winner);assert.deepEqual(calls,['gesture','tool','shortcut'].slice(0,['gesture','tool','shortcut'].indexOf(winner)+1));}assert.equal(routeCanvasKey({key:'x'},{}),'unclaimed');});

// 用伪closest模拟select和注册浮层，并传空/无效路径项，确认上下文识别不依赖全局Element。
test('DOM input context recognizes registered overlays and native selects without browser globals',()=>{
 const select={closest:selector=>selector.split(',').includes('select')?select:null};
 const overlay={closest:selector=>selector.includes('[data-canvas-overlay-view]')?overlay:null};
 assert.deepEqual(canvasKeyContext({target:select}),{textEditing:true,overlay:false});
 assert.deepEqual(canvasKeyContext({target:overlay}),{textEditing:false,overlay:true});
 assert.deepEqual(canvasKeyContext({target:null,composedPath:()=>[null,{},42]}),{textEditing:false,overlay:false});
});
// 事件target已被Shadow DOM重定向到host，composedPath仍含textarea；Escape必须留给内部文本而非取消画布手势。
test('retargeted shadow events retain their inner text owner and never reach a gesture',()=>{
 const input={closest:selector=>selector.split(',').includes('textarea')?input:null},host={closest:()=>null};
 const context=canvasKeyContext({target:host,composedPath:()=>[input,host]});let canceled=false;
 assert.equal(routeCanvasKey({key:'Escape',...context},{gesture:()=>{canceled=true;return true;}}),'text');assert.equal(canceled,false);
});