// Web e2e contract for a conversation grown through the real composer rather
// than pre-seeded history. Twelve deterministic replay turns exercise repeated
// send/settle/render cycles, including two real bash executions and one long,
// multi-chunk final turn. Assertions stay semantic: no host timing, heap, or
// mounted-row cardinality is treated as a correctness contract.
import { mkdtemp, rm, writeFile } from 'node:fs/promises'
import { tmpdir } from 'node:os'
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 { CallId, type StreamChunk } from '@deepseek-ai/dsh-llm'
import type { ReplayEntry, ReplayOverrideDoc } from '@deepseek-ai/dsh-llm-replay'
import type { SessionEvent, SessionId } from '@deepseek-ai/dsh-session'
import {
  launchWebScaffold,
  watchConsole,
  webSnapshotMode,
  type WebScaffold,
} from './scaffold.ts'
import { connectFreshWorkspace, newEnglishPage, saveFailureShot } from './support.ts'

const MODE = webSnapshotMode()
const TURN_COUNT = 12
const TOOL_TURNS = [4, 9] as const
const STREAM_PACE_MS = 10

interface TurnSpec {
  readonly index: number
  readonly prompt: string
  readonly userMarker: string
  readonly firstMarker: string
  readonly doneMarker: string
  readonly deltas: readonly string[]
  readonly callId?: ReturnType<typeof CallId>
  readonly toolResultMarker?: string
}

function suffix(index: number): string {
  return String(index).padStart(3, '0')
}

function longFinalPrompt(userMarker: string): string {
  return [
    `${userMarker} Reconcile this accumulated conversation without losing earlier turn ownership.`,
    ...Array.from(
      { length: 36 },
      (_, index) => `Context ${String(index + 1).padStart(2, '0')}: preserve token-${String(index)} and verify ${'payload '.repeat(12).trimEnd()}.`,
    ),
    'Return one continuous response and finish with the requested completion marker.',
  ].join('\n')
}

function turnSpec(index: number): TurnSpec {
  const id = suffix(index)
  const userMarker = `CONTINUOUS_CHAT_USER_${id}`
  const firstMarker = `CONTINUOUS_CHAT_FIRST_${id}`
  const doneMarker = `CONTINUOUS_CHAT_DONE_${id}`
  const deltaCount = index === TURN_COUNT ? 36 : 8
  const deltas = Array.from({ length: deltaCount }, (_, chunkIndex) => {
    if (chunkIndex === 0) return `${firstMarker} `
    if (chunkIndex === deltaCount - 1) return `${doneMarker}.`
    return `turn-${id}-chunk-${String(chunkIndex).padStart(2, '0')} keeps semantic ownership stable. `
  })
  if (!TOOL_TURNS.includes(index as (typeof TOOL_TURNS)[number])) {
    return {
      index,
      prompt: index === TURN_COUNT
        ? longFinalPrompt(userMarker)
        : `${userMarker} Continue this same conversation through turn ${String(index)}.`,
      userMarker,
      firstMarker,
      doneMarker,
      deltas,
    }
  }
  return {
    index,
    prompt: `${userMarker} Run the requested deterministic tool for turn ${String(index)}, then continue.`,
    userMarker,
    firstMarker,
    doneMarker,
    deltas,
    callId: CallId(`continuous-chat-tool-${id}`),
    toolResultMarker: `CONTINUOUS_CHAT_TOOL_RESULT_${id}`,
  }
}

function textStream(spec: TurnSpec): StreamChunk[] {
  const response = spec.deltas.join('')
  return [
    { type: 'block-start', index: 0, blockType: 'text' },
    ...spec.deltas.map(text => ({ type: 'text-delta' as const, index: 0, text })),
    { type: 'block-end', index: 0, block: { type: 'text', text: response } },
    {
      type: 'usage',
      usage: {
        inputTokens: Math.ceil(spec.prompt.length / 4),
        outputTokens: Math.ceil(response.length / 4),
      },
    },
    { type: 'finish', reason: { kind: 'stop' } },
  ]
}

function toolStream(spec: TurnSpec): StreamChunk[] {
  if (spec.callId === undefined || spec.toolResultMarker === undefined) {
    throw new Error(`turn ${String(spec.index)} has no tool identity`)
  }
  const args = JSON.stringify({
    command: `printf '${spec.toolResultMarker}\\n'`,
    description: spec.toolResultMarker,
  })
  return [
    { type: 'block-start', index: 0, blockType: 'tool-call' },
    {
      type: 'tool-call-delta',
      index: 0,
      id: spec.callId,
      name: 'bash',
      argumentsDelta: args,
    },
    {
      type: 'block-end',
      index: 0,
      block: { type: 'tool-call', id: spec.callId, name: 'bash', arguments: args },
    },
    { type: 'usage', usage: { inputTokens: 256, outputTokens: 24 } },
    { type: 'finish', reason: { kind: 'tool-calls' } },
  ]
}

function replayScript(specs: readonly TurnSpec[]): ReplayOverrideDoc {
  return specs.flatMap((spec): ReplayEntry[] => {
    const final: ReplayEntry = { kind: 'chunks', chunks: textStream(spec) }
    return spec.callId === undefined
      ? [final]
      : [{ kind: 'chunks', chunks: toolStream(spec) }, final]
  })
}

function userText(event: Extract<SessionEvent, { type: 'user/message' }>): string {
  return event.data.content
    .filter(block => block.type === 'text')
    .map(block => block.text)
    .join('')
}

function assistantText(event: Extract<SessionEvent, { type: 'assistant/message' }>): string {
  return event.data.message.content
    .filter(block => block.type === 'text')
    .map(block => block.text)
    .join('')
}

function toolResultText(event: Extract<SessionEvent, { type: 'tool/result' }>): string {
  return event.data.message.content[0].content
    .filter(block => block.type === 'text')
    .map(block => block.text)
    .join('')
}

describe('web e2e: continuous conversation grown through the composer', () => {
  let browser: Browser
  let page: Page
  let replayDir: string
  let scaffold: WebScaffold
  let tripwire: ReturnType<typeof watchConsole>
  const consoleWarnings: string[] = []
  const sessionEvents: SessionEvent[] = []
  const specs = Array.from({ length: TURN_COUNT }, (_, offset) => turnSpec(offset + 1))

  beforeAll(async () => {
    replayDir = await mkdtemp(join(tmpdir(), 'dsh-continuous-chat-replay-'))
    const replayOverride = join(replayDir, 'replay.override.json')
    await writeFile(replayOverride, JSON.stringify(replayScript(specs)))
    scaffold = await launchWebScaffold({
      replayFixture: join(replayDir, 'override-only.jsonl'),
      replayOverride,
      replayContextWindow: 10_000_000,
      paceMs: STREAM_PACE_MS,
    })
    scaffold.ctx.on('session/event', (_session, event: SessionEvent) => {
      sessionEvents.push(event)
    })
    browser = await chromium.launch()
    page = await newEnglishPage(browser, 900)
    tripwire = watchConsole(page)
    page.on('console', (message) => {
      if (message.type() === 'warning') consoleWarnings.push(message.text())
    })
    await page.goto(scaffold.baseUrl, { waitUntil: 'load' })
    await page.waitForSelector('[class*="frame"]', { timeout: 30_000 })
    await connectFreshWorkspace(page, scaffold.workspaceCwd, 'continuous-chat-e2e')
  }, 120_000)

  afterAll(async () => {
    const failures: unknown[] = []
    await browser?.close().catch((error: unknown) => failures.push(error))
    await scaffold?.close().catch((error: unknown) => failures.push(error))
    if (replayDir !== undefined) {
      await rm(replayDir, { recursive: true, force: true })
        .catch((error: unknown) => failures.push(error))
    }
    if (failures.length === 1) throw failures[0]
    if (failures.length > 1) throw new AggregateError(failures, 'continuous Chat e2e cleanup failed')
  })

  it.skipIf(MODE === 'record')('keeps twelve generated turns and tool rows bound to one live session', async () => {
    onTestFailed(() => saveFailureShot(page, 'web-e2e-chat-continuous-conversation'))
    const composer = page.locator('textarea:enabled').last()
    await composer.waitFor({ timeout: 15_000 })
    let sessionId: SessionId | undefined

    for (const spec of specs) {
      const eventStart = sessionEvents.length
      expect(await composer.inputValue()).toBe('')
      expect(await composer.isEnabled()).toBe(true)
      await composer.fill(spec.prompt)
      expect(await composer.inputValue()).toBe(spec.prompt)

      const settled = scaffold.whenTurnSettled(60_000)
      await page.getByRole('button', { name: 'Send message', exact: true }).click()
      await page.getByText(spec.userMarker, { exact: false }).last().waitFor({ timeout: 15_000 })
      const echoedUser = sessionEvents.slice(eventStart).find(
        (event): event is SessionEvent<'user/message'> => (
          event.type === 'user/message'
          && event.data.source.kind === 'user'
          && userText(event).includes(spec.userMarker)
        ),
      )
      if (echoedUser === undefined) throw new Error(`turn ${String(spec.index)} has no user echo event`)
      const userRow = page.locator(`[data-chat-anchor-key="node:${String(echoedUser.seq)}"]`)
      await expect.poll(() => userRow.count(), { timeout: 10_000 }).toBe(1)
      expect(await userRow.getAttribute('data-chat-flow-kind')).toBe('user')
      expect(await userRow.textContent()).toContain(spec.userMarker)
      await page.getByText(spec.firstMarker, { exact: false }).last().waitFor({ timeout: 15_000 })
      const settledSessionId = await settled
      if (sessionId === undefined) {
        sessionId = settledSessionId
      } else {
        expect(settledSessionId).toBe(sessionId)
      }

      await expect.poll(() => page.locator('[data-streaming="true"]').count(), { timeout: 15_000 }).toBe(0)
      await page.getByText(spec.doneMarker, { exact: false }).last().waitFor({ timeout: 15_000 })
      await expect.poll(() => composer.inputValue(), { timeout: 10_000 }).toBe('')
      await expect.poll(() => composer.isEnabled(), { timeout: 10_000 }).toBe(true)

      const turnEvents = sessionEvents.slice(eventStart)
      const turnStarts = turnEvents.filter((event): event is SessionEvent<'turn/start'> => (
        event.type === 'turn/start'
      ))
      const users = turnEvents.filter((event): event is SessionEvent<'user/message'> => (
        event.type === 'user/message' && event.data.source.kind === 'user'
      ))
      const assistants = turnEvents.filter((event): event is SessionEvent<'assistant/message'> => (
        event.type === 'assistant/message'
      ))
      const finalAssistants = assistants.filter(event => assistantText(event).includes(spec.doneMarker))
      const turnEnds = turnEvents.filter((event): event is SessionEvent<'turn/end'> => (
        event.type === 'turn/end'
      ))
      const chunks = turnEvents.filter(event => event.type === 'assistant/chunk')

      expect(turnStarts).toHaveLength(1)
      expect(turnStarts[0]?.data.turn).toBe(spec.index)
      expect(users).toHaveLength(1)
      expect(users[0]?.seq).toBe(echoedUser.seq)
      expect(userText(users[0]!)).toBe(spec.prompt)
      expect(finalAssistants).toHaveLength(1)
      expect(assistants).toHaveLength(spec.callId === undefined ? 1 : 2)
      expect(turnEnds).toHaveLength(1)
      expect(turnEnds[0]?.data).toEqual({ turn: spec.index, reason: { kind: 'completed' } })
      expect(chunks).toHaveLength(spec.deltas.length + (spec.callId === undefined ? 4 : 9))

      const assistantRow = page.locator(`[data-chat-anchor-key="node:${String(finalAssistants[0]!.seq)}"]`)
      await expect.poll(() => assistantRow.count(), { timeout: 10_000 }).toBe(1)
      expect(await assistantRow.getAttribute('data-chat-flow-kind')).toBe('assistant')
      expect(await assistantRow.textContent()).toContain(spec.doneMarker)

      const calls = turnEvents.filter((event): event is SessionEvent<'tool/call'> => event.type === 'tool/call')
      const results = turnEvents.filter((event): event is SessionEvent<'tool/result'> => event.type === 'tool/result')
      if (spec.callId === undefined || spec.toolResultMarker === undefined) {
        expect(calls).toHaveLength(0)
        expect(results).toHaveLength(0)
        continue
      }

      expect(calls).toHaveLength(1)
      expect(results).toHaveLength(1)
      expect(calls[0]?.data).toMatchObject({
        turn: spec.index,
        callId: spec.callId,
        name: 'bash',
      })
      expect(results[0]?.data.turn).toBe(spec.index)
      expect(results[0]?.data.message.source.callId).toBe(spec.callId)
      expect(results[0]?.data.message.content[0].isError).toBe(false)
      expect(toolResultText(results[0]!)).toBe(`${spec.toolResultMarker}\n`)

      const toolRow = page.locator(`[data-chat-call-id="${spec.callId}"]`)
      await expect.poll(() => toolRow.count(), { timeout: 10_000 }).toBe(1)
      expect(await toolRow.textContent()).toContain(spec.toolResultMarker)
      const disclosure = toolRow.locator('[data-sample="bash"]')
      expect(await disclosure.getAttribute('aria-expanded')).toBe('false')
      await disclosure.click()
      await expect.poll(() => disclosure.getAttribute('aria-expanded'), { timeout: 10_000 }).toBe('true')
      // The collapsed summary deliberately repeats the result marker; the
      // last exact match is the expanded terminal output owned by this call.
      await toolRow.getByText(spec.toolResultMarker, { exact: true }).last().waitFor({ timeout: 10_000 })
      await disclosure.click()
      await expect.poll(() => disclosure.getAttribute('aria-expanded'), { timeout: 10_000 }).toBe('false')
    }

    if (sessionId === undefined) throw new Error('continuous conversation completed no turn')
    expect(scaffold.ctx.agents.get(sessionId)?.session.events.filter(event => (
      event.type === 'turn/end' && event.data.reason.kind === 'completed'
    ))).toHaveLength(TURN_COUNT)
    expect(specs.at(-1)?.prompt.length).toBeGreaterThan(4_000)
    expect(sessionEvents.filter(event => (
      event.type === 'assistant/chunk' && event.data.turn === TURN_COUNT
    )).length).toBeGreaterThan(30)
    expect(consoleWarnings).toEqual([])
    expect(tripwire.pageErrors).toEqual([])
    expect(tripwire.warnings).toEqual([])
  }, 180_000)
})