// Web e2e scenarios: lifecycle & chrome — the workspace-aware first-send
// flow over the real wire, reload recovery, and the dark-mode token cascade.
// One tiny recorded turn (text-only) drives the whole spec: the empty-state
// hero materializes a real Workspace + Session on first send (the jsdom
// workspace-flow suite pins the object-layer state machine over the fixture
// client; THIS spec pins the same flow through HTTP RPC + SSE + the host
// gateway), reload replays everything from the log (zero further model
// calls), and the theme scenario proves the shipped dark palette actually
// cascades: attribute -> alias token flip -> painted surface change. No
// theme/layout golden: aria snapshots are color-blind (lane scope: the
// browser-e2e-lane Agent Note); the hero's waiting state gets the one golden
// here.
import { readFile } from 'node:fs/promises'
import { fileURLToPath } from 'node:url'
import { join } from 'node:path'
import type { Browser, Page } from 'playwright'
import { chromium } from 'playwright'
import { afterAll, beforeAll, describe, expect, it, onTestFailed } from 'vitest'
import type { SessionEvent } from '@deepseek-ai/dsh-session'
import {
  acknowledgeReloadConnectionLoss, assertFixtureInventory, captureStableAria, compareOrRefreshGolden, fixtureUserPrompts,
  launchWebScaffold, recordFixture, watchConsole, webSnapshotMode, type WebScaffold,
} from './scaffold.ts'
import { connectFreshWorkspace, newEnglishPage, saveFailureShot } from './support.ts'

const SNAPSHOT_DIR = fileURLToPath(new URL('./snapshots/lifecycle-chrome', import.meta.url))
const FIXTURE = join(SNAPSHOT_DIR, 'session.jsonl')
const HERO_EXPECTED = join(SNAPSHOT_DIR, 'hero.expected.md')
const COMMAND_MENU_EXPECTED = join(SNAPSHOT_DIR, 'command-menu.expected.md')
const FUZZY_COMMAND_MENU_EXPECTED = join(SNAPSHOT_DIR, 'command-menu-fuzzy.expected.md')
const PLAN_ACTIVE_EXPECTED = join(SNAPSHOT_DIR, 'plan-active.expected.md')
// Post-reload golden: the same settled conversation rebuilt purely from
// persistence + history — byte-equal rendering is exactly the recovery claim.
const RELOADED_EXPECTED = join(SNAPSHOT_DIR, 'reloaded.expected.md')
const MODE = webSnapshotMode()

const PROMPT = 'Reply with the single word LIGHTHOUSE and stop.'
const REPLAY_PACE_MS = 100

describe('web e2e: lifecycle & chrome (workspace flow / reload / dark mode)', () => {
  let scaffold: WebScaffold
  let browser: Browser
  let page: Page
  let tripwire: ReturnType<typeof watchConsole>
  const sessionEvents: SessionEvent[] = []

  beforeAll(async () => {
    scaffold = await launchWebScaffold(MODE === 'record' ? {} : { replayFixture: FIXTURE, paceMs: REPLAY_PACE_MS })
    scaffold.ctx.on('session/event', (_session, event: SessionEvent) => { sessionEvents.push(event) })
    browser = await chromium.launch()
    page = await newEnglishPage(browser)
    tripwire = watchConsole(page)
    await page.goto(scaffold.baseUrl, { waitUntil: 'load' })
    await page.waitForSelector('[class*="frame"]', { timeout: 30_000 })
    // Fresh world: connect a Workspace so the composer scenarios start live.
    await connectFreshWorkspace(page, scaffold.workspaceCwd)
  }, 120_000)

  afterAll(async () => {
    await browser?.close()
    await scaffold?.close()
  })

  it.skipIf(MODE === 'record')('opens the shared slash menu from plus with only Command candidates', async () => {
    onTestFailed(() => saveFailureShot(page, 'web-e2e-command-menu-launcher'))
    const launcher = page.getByRole('button', { name: 'Commands' })
    await launcher.click()
    const menu = page.getByRole('listbox', { name: 'Trigger suggestions' })
    await menu.waitFor({ timeout: 10_000 })
    const snapshot = await captureStableAria(page, '[role="listbox"]', scaffold.workspaceCwd)
    await compareOrRefreshGolden(COMMAND_MENU_EXPECTED, snapshot, MODE)
    expect(snapshot).toContain('text: Commands')
    expect(snapshot).not.toContain('text: Skills')
    expect(snapshot).not.toContain('text: Subagents')
    const launchedBox = await menu.boundingBox()
    await page.locator('textarea').first().press('Escape')
    await expect.poll(() => menu.count()).toBe(0)
    const input = page.locator('textarea').first()
    await input.fill('/')
    await menu.waitFor({ timeout: 10_000 })
    const typedBox = await menu.boundingBox()
    expect(launchedBox).not.toBeNull()
    expect(typedBox).not.toBeNull()
    expect(Math.abs(launchedBox!.x - typedBox!.x)).toBeLessThan(1)
    expect(Math.abs(
      launchedBox!.y + launchedBox!.height - typedBox!.y - typedBox!.height,
    )).toBeLessThan(1)
    await input.fill('/cpt')
    await expect.poll(() => menu.getByRole('option').allTextContents()).toEqual([
      'compactCompact older conversation history',
    ])
    const fuzzySnapshot = await captureStableAria(page, '[role="listbox"]', scaffold.workspaceCwd)
    await compareOrRefreshGolden(FUZZY_COMMAND_MENU_EXPECTED, fuzzySnapshot, MODE)
    await input.fill('')
    await expect.poll(() => menu.count()).toBe(0)
  })

  it.skipIf(MODE === 'record')('shows active Plan as the warn-state status action', async () => {
    const activeScaffold = await launchWebScaffold()
    const activePage = await newEnglishPage(browser)
    const activeTripwire = watchConsole(activePage)
    try {
      await activePage.goto(activeScaffold.baseUrl, { waitUntil: 'load' })
      await activePage.waitForSelector('[class*="frame"]', { timeout: 30_000 })
      await connectFreshWorkspace(activePage, activeScaffold.workspaceCwd)
      const input = activePage.locator('textarea').first()
      await activePage.getByRole('button', { name: 'Commands' }).click()
      const menu = activePage.getByRole('listbox', { name: 'Trigger suggestions' })
      await menu.waitFor({ timeout: 10_000 })
      await menu.getByRole('option', { name: 'plan Enter or leave plan mode' }).click()
      await expect.poll(() => input.inputValue()).toBe('/plan ')
      await input.press('Enter')
      const planButton = activePage.getByRole('button', { name: 'Plan mode on, press to turn off' })
      await planButton.waitFor({ timeout: 10_000 })
      // The golden encodes an empty composer, and the button arriving does not
      // mean the submitted text is gone yet: under load the capture can catch
      // a textbox still holding `/plan`.
      await expect.poll(() => input.inputValue(), { timeout: 10_000 }).toBe('')
      const planSnapshot = await captureStableAria(activePage, '[class*="frame"]', activeScaffold.workspaceCwd)
      await compareOrRefreshGolden(PLAN_ACTIVE_EXPECTED, planSnapshot, MODE)
      const planStyle = await planButton.evaluate((element) => {
        const probe = document.createElement('span')
        probe.style.color = 'var(--dsw-alias-state-warn-label)'
        probe.style.backgroundColor = 'var(--dsw-alias-state-warn-tertiary)'
        document.body.append(probe)
        const actual = getComputedStyle(element)
        const reference = getComputedStyle(probe)
        const result = {
          color: actual.color,
          backgroundColor: actual.backgroundColor,
          borderRadius: actual.borderRadius,
          fontSize: actual.fontSize,
          referenceColor: reference.color,
          referenceBackgroundColor: reference.backgroundColor,
        }
        probe.remove()
        return result
      })
      expect(planStyle.color).toBe(planStyle.referenceColor)
      expect(planStyle.backgroundColor).toBe(planStyle.referenceBackgroundColor)
      expect(planStyle.borderRadius).toBe('999px')
      expect(planStyle.fontSize).toBe('13px')
      await planButton.click()
      await expect.poll(() => planButton.count()).toBe(0)
      expect(activeTripwire.pageErrors).toEqual([])
      expect(activeTripwire.warnings).toEqual([])
    } catch (error) {
      await saveFailureShot(activePage, 'web-e2e-plan-active').catch(() => undefined)
      throw error
    } finally {
      await activePage.close()
      await activeScaffold.close()
    }
  })

  it('sends the first prompt from the empty-state hero (all modes)', async () => {
    onTestFailed(() => saveFailureShot(page, 'web-e2e-lifecycle-send'))
    if (MODE !== 'record') {
      expect(fixtureUserPrompts(await readFile(FIXTURE, 'utf8'))).toEqual([PROMPT])
    }
    // The blank frame renders the hero, not the resident composer: the
    // headline plus the guidance placeholder are the empty state's anchors.
    await expect.poll(() => page.getByText('Into the Unknown', { exact: false }).count(), { timeout: 15_000 }).toBe(1)
    const input = page.locator('textarea').first()
    await input.waitFor({ timeout: 10_000 })
    if (MODE !== 'record') {
      // Golden of the hero's stable waiting state (captured before any send;
      // the conversation-region goldens belong to the other scenarios).
      const snapshot = await captureStableAria(page, '[class*="frame"]', scaffold.workspaceCwd)
      await compareOrRefreshGolden(HERO_EXPECTED, snapshot, MODE)
    }
    const settled = scaffold.whenTurnSettled()
    await input.fill(PROMPT)
    const observeTurn = async () => {
      const originalViewport = page.viewportSize() ?? { width: 1680, height: 1000 }
      if (MODE !== 'record') await page.setViewportSize({ width: 480, height: 1000 })
      try {
        await input.press('Enter')
        if (MODE !== 'record') {
          const liveTail = page.locator('[data-variant="think"][data-state="running"] [data-follow-end]')
          await expect.poll(async () => await liveTail.evaluate(element => (
            element.scrollWidth > element.clientWidth
              && element.scrollLeft >= element.scrollWidth - element.clientWidth - 1
          )), { timeout: 10_000, interval: 10 }).toBe(true)
        }
        return await settled
      } finally {
        if (MODE !== 'record') await page.setViewportSize(originalViewport)
      }
    }
    const sessionId = await observeTurn()
    if (MODE === 'record') {
      await recordFixture(scaffold, sessionId, FIXTURE)
    }
  }, 200_000)

  it.skipIf(MODE === 'record')('materialized a real Workspace and Session over the wire', async () => {
    onTestFailed(() => saveFailureShot(page, 'web-e2e-lifecycle-materialize'))
    // Browser: the sidebar tree now carries the auto-created workspace group
    // with its one session, and the opened session is the selected row. The
    // compact layout dropped group session counts, so the group row itself is
    // the barrier.
    await expect.poll(
      () => page.locator('[role="treeitem"][aria-expanded]').filter({ hasText: 'workspace' }).count(),
      { timeout: 15_000 },
    ).toBeGreaterThanOrEqual(1)
    await expect.poll(() => page.locator('[role="treeitem"][aria-selected="true"]').count(), { timeout: 10_000 }).toBe(1)
    await expect.poll(() => page.getByText('LIGHTHOUSE', { exact: true }).count(), { timeout: 15_000 }).toBeGreaterThanOrEqual(1)
    // Host: the session's durable header cwd is the folder the workspace
    // flow created and adopted (<workspaceCwd>/workspace) — the proof the
    // send went through workspace materialization rather than a bare
    // default-cwd session.
    const cwds = scaffold.ctx.sessions.list().map(session => session.header.cwd)
    expect(cwds).toEqual([join(scaffold.workspaceCwd, 'workspace')])
    const turnEnds = sessionEvents.filter(e => e.type === 'turn/end')
    expect(turnEnds).toHaveLength(1)
    expect((turnEnds[0] as SessionEvent & { data: { reason: { kind: string } } }).data.reason.kind).toBe('completed')
  }, 60_000)

  it.skipIf(MODE === 'record')('recovers the whole surface across a reload from the log alone', async () => {
    onTestFailed(() => saveFailureShot(page, 'web-e2e-lifecycle-reload'))
    const warningStart = tripwire.warnings.length
    await page.reload({ waitUntil: 'load' })
    await page.waitForSelector('[class*="frame"]', { timeout: 30_000 })
    acknowledgeReloadConnectionLoss(tripwire, warningStart)
    // Selection persisted (dsh.sessions.current) and history replayed: the
    // recorded turn re-renders from session.history with zero model calls —
    // the replay cursor was fully consumed before the reload, so any stray
    // request would fail the scenario loudly at close().
    await expect.poll(() => page.getByText('LIGHTHOUSE', { exact: true }).count(), { timeout: 15_000 }).toBeGreaterThanOrEqual(1)
    await expect.poll(() => page.locator('[role="treeitem"][aria-selected="true"]').count(), { timeout: 10_000 }).toBe(1)
    // Golden of the recovered conversation region: rebuilt from the log, it
    // must render the same settled transcript the live turn produced.
    const snapshot = await captureStableAria(page, '[class*="centerCol"]', scaffold.workspaceCwd)
    await compareOrRefreshGolden(RELOADED_EXPECTED, snapshot, MODE)
    expect(tripwire.pageErrors).toEqual([])
  }, 90_000)

  it.skipIf(MODE === 'record')('cascades the dark theme from the body attribute to painted surfaces', async () => {
    onTestFailed(() => saveFailureShot(page, 'web-e2e-lifecycle-dark'))
    // This scenario pins the ThemeRuntime's DOM contract directly (the
    // body[data-ds-dark-theme] attribute -> stylesheet cascade); the REAL
    // user gesture above it (Settings -> Appearance cubes) is owned by
    // settings-chrome.e2e.ts. Driving the attribute here keeps the cascade
    // pinned independently of the settings surface's own lifecycle.
    const sample = async (): Promise<{ token: string; sidebarBg: string; bodyBg: string }> =>
      await page.evaluate(() => {
        const sidebar = document.querySelector('[class*="sidebar"], [class*="rail"]') ?? document.body
        return {
          token: getComputedStyle(document.body).getPropertyValue('--dsw-alias-bg-base').trim(),
          sidebarBg: getComputedStyle(sidebar).backgroundColor,
          bodyBg: getComputedStyle(document.body).backgroundColor,
        }
      })
    const light = await sample()
    await page.evaluate(() => { document.body.setAttribute('data-ds-dark-theme', '') })
    const dark = await sample()
    // The alias token itself must flip — the cascade's root fact.
    expect(dark.token).not.toBe(light.token)
    // And a real painted surface must consume it (not just variables in a
    // void): at least one of the sampled backgrounds repaints.
    expect(dark.sidebarBg !== light.sidebarBg || dark.bodyBg !== light.bodyBg).toBe(true)
    // Removing the attribute restores the light values exactly (the palettes
    // live in one stylesheet; activation is attribute-only by design).
    await page.evaluate(() => { document.body.removeAttribute('data-ds-dark-theme') })
    const restored = await sample()
    expect(restored).toEqual(light)
    expect(tripwire.pageErrors).toEqual([])
  }, 60_000)

  it.skipIf(MODE === 'record')('keeps the fixture inventory closed', async () => {
    expect(tripwire.warnings).toEqual([])
    await assertFixtureInventory(SNAPSHOT_DIR, [
      'session.jsonl', 'command-menu.expected.md', 'command-menu-fuzzy.expected.md', 'hero.expected.md', 'plan-active.expected.md', 'reloaded.expected.md',
    ])
  })
})