import assert from 'node:assert/strict'
import { readFileSync } from 'node:fs'
import { runInNewContext } from 'node:vm'
import test from 'node:test'

function page(wx, bridgeReady = true) {
  const html = readFileSync(new URL('../../backend/app/templates/wechat-binding-mobile.html', import.meta.url), 'utf8')
  const script = html.match(/<script nonce="__NONCE__">([\s\S]*?)<\/script>/)[1]
  const nodes = Object.fromEntries(['return-button', 'return-hint', 'wechat-sdk'].map(id => [id, { textContent: '', handlers: {}, addEventListener(name, fn) { this.handlers[name] = fn } }]))
  const timers = [], events = {}, calls = []
  const window = { WeixinJSBridge: bridgeReady ? {} : undefined, wx: wx === false ? undefined : { miniProgram: { navigateBack: args => calls.push(args), ...wx } } }
  runInNewContext(script, { window, document: { getElementById: id => nodes[id], addEventListener: (name, fn) => { events[name] = fn } },
    setTimeout: fn => { timers.push(fn); return timers.length }, clearTimeout() {} })
  return { nodes, timers, events, calls, window }
}

test('mobile callback bridge returns to previous page without a login token or home redirect', () => {
  const p = page({})
  assert.equal(p.calls.length, 1)
  assert.equal(p.calls[0].delta, 1)
  p.nodes['return-button'].handlers.click()
  assert.equal(p.calls.length, 1)
})

test('missing SDK keeps manual return hint and loaded SDK can recover', () => {
  const p = page(false)
  p.timers.forEach(fn => fn())
  assert.match(p.nodes['return-hint'].textContent, /左上角/)
  p.window.wx = { miniProgram: { navigateBack: args => p.calls.push(args) } }
  p.nodes['wechat-sdk'].handlers.load()
  assert.equal(p.calls.length, 1)
})

test('bridge failure or silent timeout permits retry with return button', () => {
  for (const failure of ['fail', 'timeout']) {
    const p = page({})
    if (failure === 'fail') p.calls[0].fail(); else p.timers.forEach(fn => fn())
    assert.match(p.nodes['return-hint'].textContent, /左上角/)
    p.nodes['return-button'].handlers.click()
    assert.equal(p.calls.length, 2)
  }
})


test('late WeixinJSBridge readiness never queues duplicate navigation', () => {
  const p = page({}, false)
  p.nodes['wechat-sdk'].handlers.load()
  p.nodes['return-button'].handlers.click()
  p.timers.forEach(fn => fn())
  assert.equal(p.calls.length, 0)
  p.window.WeixinJSBridge = {}
  p.events.WeixinJSBridgeReady()
  assert.equal(p.calls.length, 1)
  p.timers.forEach(fn => fn())
  p.events.WeixinJSBridgeReady()
  assert.equal(p.calls.length, 1)
})