'use strict'

const assert = require('node:assert/strict')
const Module = require('node:module')
const test = require('node:test')
const { EventEmitter } = require('node:events')

// displays.js 顶层 require('electron')，而开发机上的 electron 包没有下载 dist，直接 require 会抛。
// 这里在加载它之前把 electron 换成桩：本文件只验证「窗口模式 ↔ URL 里的 windowed」这条不变式，
// 不需要真窗口，也跑不了真的窗口级全屏（那只能在 Windows 实机上验）。
class FakeWebContents extends EventEmitter {
  constructor() {
    super()
    this.url = ''
    this.sent = []
    this.loadCount = 0
  }

  send(channel, payload) {
    this.sent.push([channel, payload])
  }

  loadURL(url) {
    this.url = url
    this.loadCount += 1
    this.emit('did-finish-load')
    return Promise.resolve()
  }

  getURL() {
    return this.url
  }

  reload() {
    this.loadCount += 1
    this.emit('did-finish-load')
  }
}

let created = []

class FakeBrowserWindow extends EventEmitter {
  constructor(options) {
    super()
    this.options = options
    this.webContents = new FakeWebContents()
    this.destroyed = false
    this.kiosk = options.kiosk === true
    this.fullScreen = false
    // 模拟真实 Electron 在切换瞬间回读到的旧值：设了它 isFullScreen() 就返回这个
    this.staleFullScreen = undefined
    this.bounds = { x: options.x, y: options.y, width: options.width, height: options.height }
    this.shown = false
    created.push(this)
  }

  // Electron 的 BrowserWindow.loadURL 是 webContents.loadURL 的快捷方式，displays.js 用的是前者
  loadURL(url) {
    return this.webContents.loadURL(url)
  }

  isDestroyed() {
    return this.destroyed
  }

  destroy() {
    this.destroyed = true
    this.emit('closed')
  }

  isFullScreen() {
    return this.staleFullScreen === undefined ? this.fullScreen : this.staleFullScreen
  }

  setFullScreen(value) {
    this.fullScreen = value
  }

  isKiosk() {
    return this.kiosk
  }

  setKiosk(value) {
    this.kiosk = value
  }

  getBounds() {
    return this.bounds
  }

  setBounds(bounds) {
    this.bounds = bounds
  }

  setIgnoreMouseEvents(value) {
    this.ignoreMouse = value
  }

  show() {
    this.shown = true
  }

  focus() {}

  isMinimized() {
    return false
  }

  restore() {}
}

const fakeScreen = {
  displays: [],
  primaryId: 1,
  getAllDisplays() {
    return this.displays
  },
  getPrimaryDisplay() {
    return this.displays.find((item) => item.id === this.primaryId) || this.displays[0]
  },
  on() {},
  removeListener() {}
}

const electronStub = { BrowserWindow: FakeBrowserWindow, screen: fakeScreen }
const originalLoad = Module._load
Module._load = function (request, parent, isMain) {
  if (request === 'electron') return electronStub
  return originalLoad.call(this, request, parent, isMain)
}
const { DisplayManager } = require('./displays')
Module._load = originalLoad

const WIDTH = 1920
const HEIGHT = 1080

function fakeDisplay(id, { internal = false } = {}) {
  return { id, label: `显示器 ${id}`, internal, bounds: { x: 0, y: 0, width: WIDTH, height: HEIGHT }, scaleFactor: 1 }
}

function makeManager(t, { selection = 'all', kiosk = true } = {}) {
  fakeScreen.displays = []
  fakeScreen.primaryId = 1
  created = []
  const log = { lines: [], push(_scope, text) { this.lines.push(text) } }
  const manager = new DisplayManager({
    values: {
      display: {
        selection,
        displays: [],
        pages: ['standings', 'medals'],
        pageParam: 'page',
        kiosk,
        ignoreMouse: true,
        reloadEveryHours: 0,
        backgroundColor: '#000000'
      }
    },
    server: { host: '0.0.0.0', port: 19540 },
    log
  })
  t.after(() => manager.closeAll())
  return manager
}

/**
 * 唯一不变式：窗口的几何/模式、页面 URL 里的 windowed 参数必须一致。
 * 这条断言在每个用例里都跑，任何一种脱钩都会在这里炸出来。
 */
function assertModeConsistent(manager, displayId, expectedSingle) {
  const entry = manager.windows.get(displayId)
  assert.ok(entry, `display=${displayId} 上应该有窗口`)

  assert.equal(entry.single, expectedSingle, `entry.single 应为 ${expectedSingle}`)
  assert.equal(entry.win.isKiosk(), expectedSingle === false, 'kiosk 标记应与 entry.single 一致')

  const url = new URL(entry.win.webContents.getURL())
  assert.equal(url.pathname, '/display')
  assert.equal(
    url.searchParams.get('windowed'),
    expectedSingle ? '1' : null,
    `URL 的 windowed 应与 entry.single 一致：${url.href}`
  )

  const bounds = entry.win.getBounds()
  assert.equal(bounds.width, expectedSingle ? Math.round(WIDTH * 0.8) : WIDTH, '窗口宽度应与模式一致')
  assert.equal(bounds.height, expectedSingle ? Math.round(HEIGHT * 0.8) : HEIGHT, '窗口高度应与模式一致')

  return entry
}

test('单屏排布：窗口化窗口的 URL 带 windowed=1', (t) => {
  const manager = makeManager(t)
  fakeScreen.displays = [fakeDisplay(1, { internal: true })]

  manager.enable()

  const entry = assertModeConsistent(manager, 1, true)
  assert.equal(entry.manual, false)
})

test('多屏排布：kiosk 窗口的 URL 不带 windowed', (t) => {
  const manager = makeManager(t)
  fakeScreen.displays = [fakeDisplay(1, { internal: true }), fakeDisplay(2)]

  manager.enable()

  assertModeConsistent(manager, 1, false)
  assertModeConsistent(manager, 2, false)
})

test('回归：窗口化窗口被排布改成 kiosk 时，URL 一并换成不带 windowed 并重载', (t) => {
  const manager = makeManager(t)
  fakeScreen.displays = [fakeDisplay(1, { internal: true })]
  manager.enable()

  const before = assertModeConsistent(manager, 1, true)
  const loadsBefore = before.win.webContents.loadCount
  assert.match(before.win.webContents.getURL(), /windowed=1/)

  // 插上第二块屏，整机从「单屏窗口化」变成「多屏 kiosk」
  fakeScreen.displays = [fakeDisplay(1, { internal: true }), fakeDisplay(2)]
  manager.layout()

  const after = assertModeConsistent(manager, 1, false)
  assert.equal(after.win, before.win, '同一个窗口应当就地改模式，而不是重建')
  assert.equal(after.win.webContents.loadCount, loadsBefore + 1, '模式变了必须重载一次 URL')
  assert.doesNotMatch(after.win.webContents.getURL(), /windowed=1/)
})

test('回归反向：kiosk 窗口被排布改成窗口化时，URL 补上 windowed=1', (t) => {
  const manager = makeManager(t)
  fakeScreen.displays = [fakeDisplay(1, { internal: true }), fakeDisplay(2)]
  manager.enable()

  const before = assertModeConsistent(manager, 1, false)
  const loadsBefore = before.win.webContents.loadCount

  // 拔掉扩展屏，只剩主屏 → 退化成窗口化
  fakeScreen.displays = [fakeDisplay(1, { internal: true })]
  manager.layout()

  const after = assertModeConsistent(manager, 1, true)
  assert.equal(after.win, before.win, '同一个窗口应当就地改模式，而不是重建')
  assert.equal(after.win.webContents.loadCount, loadsBefore + 1, '模式变了必须重载一次 URL')
  assert.match(after.win.webContents.getURL(), /windowed=1/)
})

test('管理面板手动开的窗口保持自己的模式，不被自动排布改成 kiosk', (t) => {
  const manager = makeManager(t)
  const primary = fakeDisplay(1, { internal: true })
  fakeScreen.displays = [primary]

  const opened = manager.openOn(primary, { page: 'standings', single: true })
  assert.deepEqual(opened, { created: true, mode: 'windowed' })
  assertModeConsistent(manager, 1, true)

  // 之后整机变成多屏，自动排布也不许把这个手动开的小窗顶成 kiosk
  fakeScreen.displays = [primary, fakeDisplay(2)]
  manager.layout()

  assertModeConsistent(manager, 1, true)
  assertModeConsistent(manager, 2, false)
})

test('模式上报以 entry 为准：窗口化窗口被 F11 全屏后仍报 windowed', (t) => {
  const manager = makeManager(t)
  const primary = fakeDisplay(1, { internal: true })
  fakeScreen.displays = [primary]

  manager.openOn(primary, { single: true })
  const win = manager.windows.get(1).win
  win.setFullScreen(true)

  // 只聚焦不重建时，模式必须还说窗口化：拿 isFullScreen() 反推会误报成 kiosk
  assert.deepEqual(manager.openOn(primary, { single: true }), { created: false, mode: 'windowed' })
  assert.equal(manager.listDisplays().displays.find((item) => item.id === 1).mode, 'windowed')
  assert.equal(manager.modeOf(manager.windows.get(1)), 'windowed')

  // kiosk 窗口不受 F11 影响，仍报 kiosk
  fakeScreen.displays = [primary, fakeDisplay(2)]
  manager.layout()
  assert.equal(manager.listDisplays().displays.find((item) => item.id === 2).mode, 'kiosk')
})

test('F11 下发的是算出来的确定值，不回读窗口', (t) => {
  const manager = makeManager(t)
  fakeScreen.displays = [fakeDisplay(1, { internal: true })]
  manager.enable()

  const win = manager.windows.get(1).win
  const [handler] = win.webContents.listeners('before-input-event')
  assert.ok(handler, '窗口化窗口必须挂 F11 处理')

  let prevented = 0
  const pressF11 = () => handler({ preventDefault: () => { prevented += 1 } }, { type: 'keyDown', key: 'F11' })

  win.webContents.sent.length = 0
  pressF11()
  assert.equal(prevented, 1)
  assert.equal(win.isFullScreen(), true)
  assert.deepEqual(win.webContents.sent, [['window:fullscreen-changed', true]])

  win.webContents.sent.length = 0
  pressF11()
  assert.equal(win.isFullScreen(), false)
  assert.deepEqual(win.webContents.sent, [['window:fullscreen-changed', false]])

  // 切换瞬间回读可能拿到旧值：enter/leave 必须下发事件本身的确定值
  win.webContents.sent.length = 0
  win.staleFullScreen = false
  win.emit('enter-full-screen')
  assert.deepEqual(win.webContents.sent, [['window:fullscreen-changed', true]])

  win.webContents.sent.length = 0
  win.staleFullScreen = true
  win.emit('leave-full-screen')
  assert.deepEqual(win.webContents.sent, [['window:fullscreen-changed', false]])
  win.staleFullScreen = undefined

  // 加载完成那次窗口状态已经稳定，继续用「读一次」
  win.webContents.sent.length = 0
  win.fullScreen = true
  win.webContents.emit('did-finish-load')
  assert.deepEqual(win.webContents.sent, [['window:fullscreen-changed', true]])
})

test('kiosk 窗口不挂 F11 处理', (t) => {
  const manager = makeManager(t)
  fakeScreen.displays = [fakeDisplay(1, { internal: true }), fakeDisplay(2)]

  manager.enable()

  assert.equal(manager.windows.get(2).win.webContents.listeners('before-input-event').length, 0)
})