'use strict';
const assert = require('node:assert/strict');
const fs = require('node:fs');
const os = require('node:os');
const path = require('node:path');
const vm = require('node:vm');
const create = require('../lib/capture-funnel');
const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'juzi-funnel-test-'));
const file = path.join(dir, 'events.jsonl');
const funnel = create(file);
const today = Date.parse('2026-10-16T02:00:00Z'), yesterday = today - 86400000;
const stages = ['started','front','right','left','submitted','response','report'];
const body = (id, n) => ({ id: id.repeat(32), events: stages.slice(0,n).map((stage,i)=>({stage,ms:i*1000})) });
assert(funnel.ingest(body('a',7), yesterday));
assert(funnel.ingest(body('a',2), today)); // late old snapshot cannot regress
assert(funnel.ingest(body('a',7), today)); // retries do not inflate
assert(funnel.ingest(body('b',6), today));
assert(funnel.ingest({...body('c',1),events:[{stage:'started',ms:0},{stage:'failed',ms:500}]},today));
assert(funnel.ingest({...body('d',1),events:[{stage:'started',ms:0},{stage:'canceled',ms:600}]},today));
assert(funnel.ingest({...body('e',1),events:[{stage:'started',ms:0},{stage:'interrupted',ms:700}]},today));
assert.equal(funnel.ingest({id:'x',events:[]}),false);
assert.equal(funnel.ingest({id:'f'.repeat(32),events:[{stage:'started',ms:0},{stage:'report',ms:20}]}),false);
assert.equal(funnel.ingest({id:'f'.repeat(32),events:[{stage:'started',ms:0},{stage:'front',ms:-1}]}),false);
const stats=funnel.stats(today);
assert.equal(stats.total.counts.started,5); assert.equal(stats.total.counts.report,1);
assert.equal(stats.total.rate,20);assert.equal(stats.total.avg_ms,6000);
assert.equal(stats.today.counts.started,4);assert.equal(stats.today.counts.report,0);
assert.equal(stats.total.response_without_report,1);assert.equal(stats.total.unfinished,2);
assert.deepEqual(create(file).stats(today),stats); // durable after service restart
const rows=fs.readFileSync(file,'utf8').trim().split('\n').map(JSON.parse);
assert.equal(rows.length,19);assert.deepEqual(Object.keys(rows[0]),['id','stage','ms','at']);
// Run actual browser telemetry helpers in isolation: no real network, no paid API.
const source=fs.readFileSync(path.join(__dirname,'../js/app.js'),'utf8');
const helper=source.slice(source.indexOf('  var captureJourney ='), source.indexOf('  /* camera-outline-pure-begin */'));
const calls=[];const ctx={ IS_MOCK:false,Uint8Array,Array,Date,Math,JSON,
 window:{crypto:require('node:crypto').webcrypto},fetch(url,opts){calls.push({url,opts});return Promise.resolve({ok:true});} };
vm.createContext(ctx);vm.runInContext(helper,ctx);
ctx.beginCaptureJourney(); stages.slice(1).forEach(s=>ctx.trackCapture(s));
ctx.trackCapture('report');ctx.trackCapture('canceled');
assert.equal(calls.length,7);assert.equal(calls[6].url,'api/capture-funnel');
assert.equal(calls[6].opts.keepalive,true);assert(funnel.ingest(JSON.parse(calls[6].opts.body),today));
ctx.IS_MOCK=true;ctx.beginCaptureJourney();ctx.trackCapture('started');assert.equal(calls.length,7);
ctx.IS_MOCK=false;ctx.beginCaptureJourney();ctx.trackCapture('canceled');ctx.trackCapture('front');assert.equal(calls.length,9);
ctx.fetch=()=>{throw Error('unavailable');};assert.doesNotThrow(()=>ctx.beginCaptureJourney());
assert(source.indexOf("trackCapture('report')")>source.indexOf("showScreen('s-report', 'replace')"));
console.log('PASS: deduplicated durable anonymous funnel, cumulative/out-of-order delivery, Beijing cohorts, terminal/missing states, mock exclusion, nonblocking browser telemetry');