// The components, rendered through a tiny React double.
//
// Why a double instead of React: this repository ships no runtime dependency at
// all, and the whole point of these tests is the wiring — which component reads
// which prop through which seat. The double implements the four React entry
// points this package uses, so a component render is exercised end to end (hooks
// included) without a DOM or a real React.
//
// It runs against the BUILT artifact, because that is what the page loads.
import { test } from 'node:test'
import assert from 'node:assert/strict'
import { readFile } from 'node:fs/promises'
import { dirname, resolve } from 'node:path'
import { fileURLToPath } from 'node:url'

const repoRoot = resolve(dirname(fileURLToPath(import.meta.url)), '..')
const source = await readFile(resolve(repoRoot, 'client.js'), 'utf8')

/** The smallest React this package can run on, plus a way to run effects on demand. */
function createReactDouble({ runEffects = false } = {}) {
  const pending = []
  return {
    pending,
    React: {
      Fragment: Symbol('Fragment'),
      createElement: (type, props, ...children) => ({ type, props: props ?? {}, children }),
      useCallback: (callback) => callback,
      useEffect: (effect) => {
        pending.push(effect)
        // Components here may only touch the DOM from their own effects, so this
        // is opt-in: ToastLayer's escape-key effect needs a document.
        if (runEffects) effect()
      },
      useSyncExternalStore: (subscribe, getSnapshot) => getSnapshot(),
    },
  }
}

/** Materialize the artifact, then install it, and hand back its three seats. */
function mount({ runEffects = false } = {}) {
  const { React, pending } = createReactDouble({ runEffects })
  let registration
  const previous = globalThis.window
  globalThis.window = { __ModuleLoader__: { load: (value) => { registration = value } } }
  try {
    // eslint-disable-next-line no-new-func -- executing the artifact IS the test
    new Function(source)()
  } finally {
    globalThis.window = previous
  }
  assert.ok(registration, 'the bundle never registered a factory')
  const exports = registration.factory((specifier) => {
    assert.equal(specifier, 'react', 'only platform seeds may be requested')
    return React
  })

  const effects = []
  const registrations = []
  exports.apply({
    get: () => undefined,
    effect: (callback, label) => {
      effects.push(label)
      return () => {}
    },
    slots: {
      inject: (name, setup) => setup(),
      register: (definition, component) => {
        registrations.push({ definition, component })
        return { dispose() {} }
      },
    },
  })
  const [toasts, config, observer] = registrations
  return { toasts, config, observer, pending, effects }
}

/** Walk a rendered element tree, collecting text, host types and every element. */
function walk(node, collected = { text: [], types: [], elements: [] }) {
  if (node === null || node === undefined || typeof node === 'boolean') return collected
  if (Array.isArray(node)) {
    for (const child of node) walk(child, collected)
    return collected
  }
  if (typeof node === 'string' || typeof node === 'number') {
    collected.text.push(String(node))
    return collected
  }
  if (typeof node.type === 'function') {
    walk(node.type(node.props), collected)
    return collected
  }
  collected.types.push(node.type)
  collected.elements.push(node)
  // The double stores a `createElement` call's children on the element itself,
  // exactly where React's own elements keep them.
  walk(node.children, collected)
  return collected
}

const flatten = (node) => walk(node).text.join(' ')
const classesOf = (rendered) => rendered.elements.map((element) => element.props.className ?? '')

/**
 * The permission hint the plugin shows on this machine. Node exposes a
 * `navigator` too, so the platform branch is exercised here rather than falling
 * through to the neutral copy.
 */
const HINT_BY_PLATFORM = {
  win32: 'Windows Settings → System → Notifications → DeepSeek Harness',
  darwin: 'System Settings → Notifications → DeepSeek Harness',
  linux: 'Allow DeepSeek Harness in your desktop notification settings (GNOME / KDE)',
}
const platformHint = HINT_BY_PLATFORM[process.platform] ?? 'Allow DeepSeek Harness in your system notification settings'

test('the plugin page reads as three groups with copy, not raw keys', () => {
  const { config } = mount()
  const rendered = walk(config.component({ ...config.definition.inject(), view: 'page' }))
  const text = rendered.text.join(' ')

  // No locale service in this context, so the seat falls back to English.
  for (const copy of [
    'Every alert comes from this page',
    'What to notify about',
    'The switches are stored in this browser',
    'Popup',
    'Auto-close',
    '6s',
    'Never',
    'Hovering a card pauses the countdown',
    'System notification permission',
    'This environment cannot show system notifications',
    platformHint,
    'Status',
    'Window',
    'Session watch',
    'Last delivery',
    'nothing delivered yet',
    'Replay',
    'Test alert',
  ]) {
    assert.ok(text.includes(copy), `the page is missing: ${copy}`)
  }
  assert.ok(!text.includes('config.'), 'a raw translation key reached the page')
  assert.ok(!text.includes('settings.'), 'a raw translation key reached the page')

  const classes = classesOf(rendered)
  for (const className of [
    'dsn-page',
    'dsn-lede',
    'dsn-group',
    'dsn-group-title',
    'dsn-group-note',
    'dsn-list',
    'dsn-row',
    'dsn-row-title',
    'dsn-state',
    'dsn-chips',
    'dsn-chip',
    'dsn-facts',
    'dsn-fact-key',
    'dsn-fact-value',
    'dsn-button',
  ]) {
    assert.ok(classes.includes(className), `the page is missing .${className}`)
  }
  // Three switches, five lifetime choices, one status dot, and the readings as
  // key/value pairs.
  assert.equal(classes.filter((className) => className === 'dsn-switch').length, 3)
  assert.equal(classes.filter((className) => className === 'dsn-chip').length, 5)
  assert.equal(classes.filter((className) => className === 'dsn-dot is-muted').length, 1)
  assert.equal(classes.filter((className) => className === 'dsn-fact-key').length, 4)
  assert.equal(classes.filter((className) => className === 'dsn-fact-value').length, 4)
})

test('the popup lifetime is a real choice: the page reads it and writes it back', () => {
  const { config } = mount()
  const props = config.definition.inject()

  const chips = (componentProps) => walk(config.component({ ...componentProps, view: 'page' }))
    .elements.filter((element) => element.props.className === 'dsn-chip')
  const labelOf = (chip) => walk(chip).text.join('')
  const checkedOf = (list) => list.filter((chip) => chip.props['aria-checked'] === true).map(labelOf)

  const before = chips(props)
  assert.deepEqual(before.map(labelOf), ['3s', '6s', '10s', '30s', 'Never'])
  assert.deepEqual(checkedOf(before), ['6s'], 'the shipped default is preselected')
  assert.equal(before[0].props.role, 'radio')
  assert.equal(walk(config.component({ ...props, view: 'page' })).elements.find((element) => element.props.className === 'dsn-chips').props.role, 'radiogroup')

  // "Never" is the zero choice, and choosing it goes through the plugin's own
  // action: the store the popup stack reads is updated, not just the button.
  before[4].props.onClick()
  assert.equal(props.store.getSnapshot().dismissAfterMs, 0)
  assert.deepEqual(checkedOf(chips(props)), ['Never'])

  before[0].props.onClick()
  assert.equal(props.store.getSnapshot().dismissAfterMs, 3000)
  assert.deepEqual(checkedOf(chips(props)), ['3s'])
})

test('the page follows the store: switches, permission state and delivery facts', () => {
  const { config } = mount()
  const props = config.definition.inject()

  props.store.set({
    ...props.store.getSnapshot(),
    kinds: { completion: false, approval: true, question: true },
  })
  const switched = walk(config.component({ ...props, view: 'page' }))
  assert.deepEqual(
    switched.elements
      .filter((element) => element.props.className === 'dsn-switch')
      .map((element) => element.props['aria-checked']),
    [false, true, true],
  )

  props.store.set({
    ...props.store.getSnapshot(),
    permission: 'granted',
    lastDelivery: { outcome: 'system', shown: true, at: '17:52:30', title: 'Conversation finished' },
  })
  const granted = walk(config.component({ ...props, view: 'page' }))
  const grantedClasses = classesOf(granted)
  // A healthy permission has no warning colour and the button becomes the
  // channel-specific test.
  assert.equal(grantedClasses.includes('dsn-dot is-muted'), false)
  assert.equal(grantedClasses.includes('dsn-dot is-error'), false)
  assert.ok(grantedClasses.includes('dsn-dot'))
  assert.ok(granted.text.join(' ').includes('Test system notification'))
  assert.ok(granted.text.join(' ').includes('17:52:30 · system notification (confirmed on screen)'))
  assert.ok(grantedClasses.includes('dsn-fact-title'))

  props.store.set({
    ...props.store.getSnapshot(),
    permission: 'denied',
    lastDelivery: null,
  })
  const denied = walk(config.component({ ...props, view: 'page' }))
  const deniedText = denied.text.join(' ')
  assert.ok(classesOf(denied).includes('dsn-dot is-error'))
  assert.ok(deniedText.includes('switched off in system settings'))
  assert.ok(deniedText.includes(platformHint))
  assert.ok(deniedText.includes('nothing delivered yet'))
})

test('the summary view is the one-line description the plugin row shows', () => {
  const { config } = mount()
  const text = flatten(config.component({ ...config.definition.inject(), view: 'summary' }))
  assert.equal(text.trim(), 'A system notification while the window is in the background, a light in-app popup while it is in the foreground; the conversation on screen is never interrupted.')
})

test('the popup stack renders nothing while empty, and one card per alert', () => {
  const { toasts } = mount()
  const props = toasts.definition.inject()
  assert.equal(toasts.component(props), null)

  props.store.set({
    ...props.store.getSnapshot(),
    toasts: [{ id: 'dsn-1', kind: 'approval', title: 'Approval required', body: 'Conversation: Bash is waiting for your approval', sessionId: 'session-1' }],
  })
  const rendered = walk(toasts.component(props))
  const text = rendered.text.join(' ')
  assert.ok(text.includes('Approval required'))
  assert.ok(text.includes('Bash is waiting for your approval'))
  assert.ok(text.includes('View'))

  const classes = classesOf(rendered)
  for (const className of ['dsn-stack', 'dsn-toast', 'dsn-toast-icon is-approval', 'dsn-toast-title', 'dsn-toast-desc', 'dsn-toast-action', 'dsn-toast-close']) {
    assert.ok(classes.includes(className), `the popup is missing .${className}`)
  }
  // The close control is a square hit area with an icon only, so its label is
  // the only accessible name it has.
  assert.equal(
    rendered.elements.find((element) => element.props.className === 'dsn-toast-close').props['aria-label'],
    'Dismiss',
  )
  // The stack announces itself politely, and an approval is an alert, not a status.
  assert.equal(rendered.elements.find((element) => element.props.className === 'dsn-stack').props['aria-live'], 'polite')
  assert.equal(rendered.elements.find((element) => element.props.className === 'dsn-toast').props.role, 'alert')
})

test('the popup buttons call back into the plugin, and the card pauses its own lifetime', () => {
  const { toasts } = mount()
  const called = []
  const props = {
    ...toasts.definition.inject(),
    dismiss: (id) => called.push(['dismiss', id]),
    open: (sessionId) => called.push(['open', sessionId]),
    arm: (id) => called.push(['arm', id]),
    hold: (id) => called.push(['hold', id]),
  }
  props.store.set({
    ...props.store.getSnapshot(),
    toasts: [{ id: 'dsn-7', kind: 'question', title: 'Answer needed', body: 'A · continue?', sessionId: 'session-9' }],
  })
  const rendered = walk(toasts.component(props))
  const card = rendered.elements.find((element) => element.props.className === 'dsn-toast')
  const [view, close] = rendered.elements.filter((element) => typeof element.props.onClick === 'function')

  card.props.onMouseEnter()
  card.props.onMouseLeave()
  view.props.onClick()
  close.props.onClick()

  assert.deepEqual(called, [
    ['hold', 'dsn-7'],
    ['arm', 'dsn-7'],
    ['dismiss', 'dsn-7'],
    ['open', 'session-9'],
    ['dismiss', 'dsn-7'],
  ])
})

test('the observer reports its own health once the session hooks arrive', () => {
  const { observer, toasts, effects } = mount({ runEffects: true })
  const store = toasts.definition.inject().store
  const observation = observer.definition.inject().observation

  // Health changes that are not `watching` also reach the tagged console, so the
  // diagnostic is captured and asserted instead of polluting the test output.
  // Note which way round it fires: the observer logs when it recovers from a
  // degraded state, and it logs the initial transition, but a healthy observer
  // turning silent reaches the console only as the settings page's own error line.
  const logged = []
  const originalError = console.error
  console.error = (message) => logged.push(String(message))
  try {
    observer.component({
      observation,
      useSessions: (select) => select({ byId: {} }),
      useSessionStatus: (select) => select(new Map()),
    })
    assert.equal(store.getSnapshot().health.state, 'watching')

    observer.component({ observation, useSessions: undefined, useSessionStatus: undefined })
    assert.equal(store.getSnapshot().health.state, 'noHooks')

    observer.component({
      observation,
      useSessions: (select) => select({ byId: {} }),
      useSessionStatus: (select) => select(new Map()),
    })
    assert.equal(store.getSnapshot().health.state, 'watching')
  } finally {
    console.error = originalError
  }
  assert.equal(logged.length, 2, `expected two health diagnostics, got ${JSON.stringify(logged)}`)
  for (const line of logged) assert.match(line, /session-notify: observer health: watching\b/)

  // The observer owns no visible UI, and it is registered without a seat locale.
  assert.equal(observer.definition.id, 'session-notify-watch')
  assert.equal(observer.definition.order, 101)
  assert.equal(observer.component({ observation }), null)
  assert.deepEqual(effects, ['session-notify: dictionaries', 'session-notify: window focus', 'session-notify: disposal'])
})