import { mkdtempSync } from 'node:fs'
import { tmpdir } from 'node:os'
import { join } from 'node:path'
import { describe, expect, it, vi } from 'vitest'
import { Context } from 'cordis'
import { CallId } from '@deepseek-ai/dsh-llm'
import { BashExecutor, BashTaskId } from '@deepseek-ai/dsh-bash'
import type { BashExecRequest, BashExecSpec, BashRunResult, BashTask, BashTaskRead, OwnerToken } from '@deepseek-ai/dsh-bash'
import SystemPrompt from '@deepseek-ai/dsh-system-prompt'
import ToolRegistry from '@deepseek-ai/dsh-tools'
import AgentRegistry from '@deepseek-ai/dsh-agent'
import type { Agent } from '@deepseek-ai/dsh-agent'
import { LocalBashExecutor } from '@deepseek-ai/dsh-bash-local'
import * as ToolBash from '@deepseek-ai/dsh-tool-bash'
import { renderResult } from '@deepseek-ai/dsh-tool-bash'

const spillDir = mkdtempSync(join(tmpdir(), 'dsh-tool-bash-spec-'))

async function setup() {
  const ctx = new Context()
  await ctx.plugin(SystemPrompt)
  await ctx.plugin(ToolRegistry)
  await ctx.plugin(AgentRegistry)
  await ctx.plugin(LocalBashExecutor, { timeoutMs: 10_000 })
  ;(ctx.bash as LocalBashExecutor).internals = { spillDir, graceMs: 200 }
  await ctx.plugin(ToolBash)
  return ctx
}

/**
 * Build a fake {@link Agent} whose session token is `sessionId`, REGISTER it in
 * `ctx.agents` (the completion-notice path finds the owning agent by scanning
 * the registry for a matching `session.header.id`), and return it. The returned
 * agent is also passed to `execute` as `exec.agent` so it owns the spawned task.
 * The registration disposer is tracked so {@link unregisterFakeAgents} can drop
 * it (simulating the owning session disconnecting before a task completes).
 */
const fakeAgentDisposers = new Map<Context, (() => void)[]>()
function registerFakeAgent(ctx: Context, sessionId: string, inject: (...args: unknown[]) => void): Agent {
  // The registry KEY (agent.id) is deliberately DIFFERENT from the session
  // token (session.header.id) — a config agent has `agentId !== sessionId`. The
  // owner token IS the session id, so the notice path must find the agent by
  // `session.header.id`, NOT the registry key. Using distinct values here makes
  // the test fail if a regression matched on the wrong field (a same-value fake
  // would pass either way — the "hits the line but not the scenario" trap).
  const agent = { id: `agent-${sessionId}`, inject, session: { header: { version: 0, id: sessionId, createdAt: 0 } } } as unknown as Agent
  const dispose = ctx.agents.register(agent)
  const list = fakeAgentDisposers.get(ctx) ?? []
  list.push(dispose)
  fakeAgentDisposers.set(ctx, list)
  return agent
}

/** Unregister every fake agent in this ctx (simulate the owning session disconnecting). */
function unregisterFakeAgents(ctx: Context): void {
  for (const dispose of fakeAgentDisposers.get(ctx) ?? []) dispose()
  fakeAgentDisposers.delete(ctx)
}

let callCounter = 0
function call(ctx: Context, name: string, args: unknown) {
  return ctx.tools.execute({ callId: CallId(`call-${++callCounter}`), name, arguments: args })
}

function text(result: { content: { type: string; text?: string }[] }): string {
  return result.content.filter(block => block.type === 'text').map(block => block.text).join('')
}

async function callUntilText(
  ctx: Context,
  name: string,
  args: unknown,
  expected: string,
  timeoutMs = 5_000,
): Promise<Awaited<ReturnType<typeof call>>> {
  const deadline = Date.now() + timeoutMs
  let last: Awaited<ReturnType<typeof call>> | undefined
  while (Date.now() < deadline) {
    last = await call(ctx, name, args)
    if (text(last).includes(expected)) return last
    await new Promise(resolve => setTimeout(resolve, 20))
  }
  throw new Error(`${name} output did not include ${JSON.stringify(expected)}; last text was ${JSON.stringify(last !== undefined ? text(last) : '')}`)
}

class LossyReadBashExecutor extends BashExecutor {
  private readonly task: BashTask = {
    id: BashTaskId('bash-lossy'),
    command: 'fake',
    status: 'running',
    exitCode: null,
    signal: null,
    done: Promise.resolve(),
  }

  resolve(request: BashExecRequest): BashExecSpec {
    return {
      command: request.command,
      workdir: request.workdir ?? process.cwd(),
      timeoutMs: request.timeoutMs ?? 0,
      ...request.signal ? { signal: request.signal } : {},
      owner: request.owner,
    }
  }

  run(): Promise<BashRunResult> {
    return Promise.reject(new Error('not used'))
  }

  start(): BashTask {
    return this.task
  }

  get(id: BashTaskId): BashTask | undefined {
    return id === this.task.id ? this.task : undefined
  }

  ownerOf(): OwnerToken | undefined {
    return undefined
  }

  list(): BashTask[] {
    return [this.task]
  }

  readOutput(id: BashTaskId): BashTaskRead {
    if (id !== this.task.id) throw new Error(`unknown bash task "${id}"`)
    return { task: this.task, delta: 'tail', lossy: true }
  }

  kill(): boolean {
    return false
  }
}

describe('bash tool', () => {
  it('returns stdout for a successful command', async () => {
    const ctx = await setup()
    const result = await call(ctx, 'bash', { command: 'echo hello', description: 'test command' })
    expect(result.isError).toBe(false)
    expect(text(result)).toBe('hello\n')
  })

  it('reports (no output) for silent commands', async () => {
    const ctx = await setup()
    const result = await call(ctx, 'bash', { command: 'true', description: 'test command' })
    expect(text(result)).toBe('(no output)')
  })

  it('marks stderr sections', async () => {
    const ctx = await setup()
    const result = await call(ctx, 'bash', { command: 'echo out; echo err >&2', description: 'test command' })
    expect(text(result)).toBe('out\n[stderr]\nerr\n')
    expect(result.isError).toBe(false)
  })

  it('reports non-zero exits without isError', async () => {
    const ctx = await setup()
    const result = await call(ctx, 'bash', { command: 'echo failing; exit 3', description: 'test command' })
    expect(result.isError).toBe(false)
    expect(text(result)).toBe('failing\n[exit code: 3]')
  })

  it('reports timeout kills with both markers (timeout first)', async () => {
    const ctx = await setup()
    const result = await call(ctx, 'bash', { command: 'sleep 60', description: 'test command', timeoutMs: 100 })
    expect(result.isError).toBe(false)
    expect(text(result)).toBe('(no output)\n[timed out after 100ms]\n[killed by signal: SIGTERM]')
  })

  it('reports a timeout even when the command traps the signal and exits 0', async () => {
    // The signal-independent timeout marker: a trapped SIGTERM that exits 0
    // after our timer fired must NOT look like a clean success. (bash may
    // print "Terminated" to stderr for the killed sleep — environment
    // dependent — so assert the marker, not the exact body.)
    const ctx = await setup()
    const result = await call(ctx, 'bash', { command: 'trap "exit 0" TERM; sleep 60', description: 'test command', timeoutMs: 100 })
    expect(result.isError).toBe(false)
    expect(text(result)).toContain('[timed out after 100ms]')
    expect(text(result)).not.toContain('[exit code:')
  })

  it('reports truncation with the spill path', async () => {
    const ctx = new Context()
    await ctx.plugin(SystemPrompt)
    await ctx.plugin(ToolRegistry)
    await ctx.plugin(LocalBashExecutor, { maxOutputBytes: 100 })
    ;(ctx.bash as LocalBashExecutor).internals = { spillDir, graceMs: 200 }
    await ctx.plugin(ToolBash)
    const result = await call(ctx, 'bash', { command: 'for i in $(seq 1 100); do printf "line-%04d\\n" $i; done', description: 'test command' })
    expect(text(result)).toContain('[output truncated; full output: ')
    expect(text(result)).toContain('line-0100')
  })

  it('honors workdir', async () => {
    const ctx = await setup()
    const result = await call(ctx, 'bash', { command: 'pwd', description: 'test command', workdir: '/tmp' })
    expect(text(result).trim()).toMatch(/\/tmp$/)
  })

  it('surfaces spawn failures as isError', async () => {
    const ctx = await setup()
    const result = await call(ctx, 'bash', { command: 'true', description: 'test command', workdir: '/nonexistent-dsh' })
    expect(result.isError).toBe(true)
    expect(text(result)).toMatch(/ENOENT/)
  })

  it('surfaces aborts as isError', async () => {
    const ctx = await setup()
    const controller = new AbortController()
    const pending = ctx.tools.execute({
      callId: CallId('call-abort'),
      name: 'bash',
      arguments: { command: 'sleep 60', description: 'test command' },
      signal: controller.signal,
    })
    setTimeout(() => { controller.abort() }, 50)
    const result = await pending
    expect(result.isError).toBe(true)
    expect(text(result)).toMatch(/aborted/)
  })

  // Type and required-key violations are now rejected by the harness
  // (defineTool validates against the SchemaSpec — the arg-validation RFC) before execute.
  it.each([
    [{}, /missing required property "command"/],
    [{ command: 42, description: 'd' }, /"command" must be a string/],
    [{ command: 'x' }, /missing required property "description"/],
    [{ command: 'x', description: 7 }, /"description" must be a string/],
    [{ command: 'x', description: 'd', timeoutMs: 'soon' }, /"timeoutMs" must be a number/],
    [{ command: 'x', description: 'd', workdir: 7 }, /"workdir" must be a string/],
    [{ command: 'x', description: 'd', run_in_background: 'yes' }, /"run_in_background" must be a boolean/],
  ])('rejects schema-invalid args %j', async (args, pattern) => {
    const ctx = await setup()
    const result = await call(ctx, 'bash', args)
    expect(result.isError).toBe(true)
    expect(text(result)).toMatch(pattern)
  })

  // Value constraints the SchemaSpec can't express stay in the tool body.
  it.each([
    [{ command: '  ', description: 'd' }, /invalid command/],
    [{ command: 'x', description: '   ' }, /invalid description/],
    [{ command: 'x', description: 'd', timeoutMs: -1 }, /invalid timeoutMs/],
    [{ command: 'x', description: 'd', timeoutMs: Number.NaN }, /invalid timeoutMs/],
  ])('rejects value-invalid args %j', async (args, pattern) => {
    const ctx = await setup()
    const result = await call(ctx, 'bash', args)
    expect(result.isError).toBe(true)
    expect(text(result)).toMatch(pattern)
  })

  it('registers all three schemas in the system prompt assembly', async () => {
    const ctx = await setup()
    const names = ctx.tools.schemas().map(schema => schema.name)
    expect(names).toEqual(['bash', 'bash_output', 'bash_kill'])
    const bashSchema = ctx.tools.schemas()[0]!
    expect(bashSchema.parameters).toMatchObject({
      type: 'object',
      required: ['command', 'description'],
    })
  })

  it('unregisters everything when the plugin fiber is disposed (HMR safety)', async () => {
    const ctx = new Context()
    await ctx.plugin(SystemPrompt)
    await ctx.plugin(ToolRegistry)
    await ctx.plugin(LocalBashExecutor, {})
    const fiber = await ctx.plugin(ToolBash)
    expect(ctx.tools.schemas()).toHaveLength(3)
    await fiber.dispose()
    expect(ctx.tools.schemas()).toHaveLength(0)
  })

  it('tools depend on the executor: no registration without ctx.bash', async () => {
    const ctx = new Context()
    await ctx.plugin(SystemPrompt)
    await ctx.plugin(ToolRegistry)
    // inject: ['tools', 'bash'] keeps the plugin pending until bash exists.
    await ctx.plugin(ToolBash)
    expect(ctx.tools.schemas()).toHaveLength(0)
    await ctx.plugin(LocalBashExecutor, {})
    await new Promise(resolve => setTimeout(resolve, 0))
    expect(ctx.tools.schemas()).toHaveLength(3)
  })
})

describe('background tools', () => {
  it('bash with run_in_background returns a task id immediately', async () => {
    const ctx = await setup()
    const result = await call(ctx, 'bash', { command: 'sleep 0.2; echo bg-done', description: 'test command', run_in_background: true })
    expect(result.isError).toBe(false)
    expect(text(result)).toMatch(/^started background task bash-\d+$/)
  })

  it('bash_output polls incrementally and reports status', async () => {
    const ctx = await setup()
    const started = await call(ctx, 'bash', { command: 'echo first; sleep 1; echo second', description: 'test command', run_in_background: true })
    const id = BashTaskId(/task (bash-\d+)/.exec(text(started))![1]!)

    const first = await callUntilText(ctx, 'bash_output', { task_id: id }, 'first')
    expect(text(first)).toContain('first')
    expect(text(first)).toContain('[status: running]')

    await ctx.bash.get(id)!.done
    const second = await call(ctx, 'bash_output', { task_id: id })
    expect(text(second)).toContain('second')
    expect(text(second)).not.toContain('first')
    expect(text(second)).toContain('[status: completed, exit code: 0]')

    const third = await call(ctx, 'bash_output', { task_id: id })
    expect(text(third)).toContain('(no new output)')
  })

  it('bash_output flags lossy reads with spill paths', async () => {
    const ctx = new Context()
    await ctx.plugin(SystemPrompt)
    await ctx.plugin(ToolRegistry)
    await ctx.plugin(LocalBashExecutor, { maxOutputBytes: 100 })
    ;(ctx.bash as LocalBashExecutor).internals = { spillDir, graceMs: 200 }
    await ctx.plugin(ToolBash)

    const started = await call(ctx, 'bash', { command: 'for i in $(seq 1 200); do printf "line-%04d\\n" $i; done', description: 'test command', run_in_background: true })
    const id = BashTaskId(/task (bash-\d+)/.exec(text(started))![1]!)
    await ctx.bash.get(id)!.done
    const read = await call(ctx, 'bash_output', { task_id: id })
    expect(text(read)).toContain('[some output was dropped from memory; full output: ')
  })

  it('bash_output reports unavailable when a lossy read has no safe spill path', async () => {
    const ctx = new Context()
    await ctx.plugin(SystemPrompt)
    await ctx.plugin(ToolRegistry)
    await ctx.plugin(LossyReadBashExecutor)
    await ctx.plugin(ToolBash)

    const read = await call(ctx, 'bash_output', { task_id: 'bash-lossy' })
    expect(text(read)).toBe('tail\n[some output was dropped from memory; full output: (unavailable)]\n[status: running]')
  })

  it('bash_kill stops a running task; repeat reports already-finished', async () => {
    const ctx = await setup()
    const started = await call(ctx, 'bash', { command: 'sleep 60', description: 'test command', run_in_background: true })
    const id = BashTaskId(/task (bash-\d+)/.exec(text(started))![1]!)

    const killed = await call(ctx, 'bash_kill', { task_id: id })
    expect(text(killed)).toBe(`killed background task ${id}`)
    await ctx.bash.get(id)!.done

    const again = await call(ctx, 'bash_kill', { task_id: id })
    expect(text(again)).toBe(`task ${id} had already finished`)

    const status = await call(ctx, 'bash_output', { task_id: id })
    expect(text(status)).toContain('[status: killed by SIGTERM]')
  })

  it('unknown task ids are isError for both tools', async () => {
    const ctx = await setup()
    const read = await call(ctx, 'bash_output', { task_id: 'bash-999' })
    expect(read.isError).toBe(true)
    expect(text(read)).toMatch(/unknown bash task/)
    const kill = await call(ctx, 'bash_kill', { task_id: 'bash-999' })
    expect(kill.isError).toBe(true)
  })

  it.each([
    ['bash_output', {}, /missing required property "task_id"/],
    ['bash_output', { task_id: 9 }, /"task_id" must be a string/],
    ['bash_kill', { task_id: '' }, /invalid task_id/],
  ])('%s rejects invalid task_id %j', async (tool, args, pattern) => {
    const ctx = await setup()
    const result = await call(ctx, tool, args)
    expect(result.isError).toBe(true)
    expect(text(result)).toMatch(pattern)
  })

  it('injects a completion notice into the owning agent (found via the registry by session token)', async () => {
    const ctx = await setup()
    const inject = vi.fn()
    // The notice path looks the agent up in ctx.agents by its session token, so
    // the agent must be REGISTERED (not merely passed to execute). Mount a
    // registry and register a fake whose session.header.id IS the owner token.
    const agent = registerFakeAgent(ctx, 'bg', inject)

    const started = await ctx.tools.execute({
      callId: CallId('call-bg'),
      name: 'bash',
      arguments: { command: 'true', description: 'test command', run_in_background: true },
      agent,
    })
    const id = BashTaskId(/task (bash-\d+)/.exec(text(started))![1]!)
    await ctx.bash.get(id)!.done

    expect(inject).toHaveBeenCalledTimes(1)
    const [content, options] = inject.mock.calls[0] as [
      { type: string; text: string }[],
      { source: { kind: string; plugin: string } },
    ]
    expect(content[0]!.text).toContain(`background bash task ${id} finished`)
    expect(content[0]!.text).toContain('bash_output')
    expect(options.source).toEqual({ kind: 'plugin', plugin: 'tool-bash' })
  })

  it('swallows ONLY the disposed-agent inject error', async () => {
    const ctx = await setup()
    const agent = registerFakeAgent(ctx, 'bg', () => { throw new Error('agent "x" is disposed') })

    const started = await ctx.tools.execute({
      callId: CallId('call-bg2'),
      name: 'bash',
      arguments: { command: 'true', description: 'test command', run_in_background: true },
      agent,
    })
    const id = BashTaskId(/task (bash-\d+)/.exec(text(started))![1]!)
    await expect(ctx.bash.get(id)!.done).resolves.toBeUndefined()
  })

  it('rethrows a non-disposed inject failure (not blindly swallowed)', async () => {
    const ctx = await setup()
    // A real bug in inject (not the benign disposed race) must surface — the
    // base-class notifier contains it (logs, does not reject task.done), but
    // the listener itself must have thrown rather than silently eaten it.
    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => undefined)
    try {
      const agent = registerFakeAgent(ctx, 'bg', () => { throw new Error('unexpected inject bug') })

      const started = await ctx.tools.execute({
        callId: CallId('call-bg3'),
        name: 'bash',
        arguments: { command: 'true', description: 'test command', run_in_background: true },
        agent,
      })
      const id = BashTaskId(/task (bash-\d+)/.exec(text(started))![1]!)
      await ctx.bash.get(id)!.done
      // notifyTaskDone caught and logged the rethrown error.
      expect(errorSpy).toHaveBeenCalled()
      const logged = errorSpy.mock.calls.flat().some(arg => arg instanceof Error && arg.message === 'unexpected inject bug')
      expect(logged).toBe(true)
    } finally {
      errorSpy.mockRestore()
    }
  })

  it('drops the notice cleanly when the owning agent is gone from the registry by completion', async () => {
    // A bash task (owned by the host-scoped bash-local fiber) can OUTLIVE its
    // per-session agent — e.g. the ACP session disconnects and its AgentHandle
    // disposes while the background task is still running. The owner token is
    // still on the task, but no live agent carries it anymore, so the registry
    // lookup finds nothing and the notice is dropped (no throw).
    const ctx = await setup()
    const inject = vi.fn()
    const agent = registerFakeAgent(ctx, 'bg', inject)
    const started = await ctx.tools.execute({
      callId: CallId('call-bg4'),
      name: 'bash',
      arguments: { command: 'true', description: 'test command', run_in_background: true },
      agent,
    })
    const id = BashTaskId(/task (bash-\d+)/.exec(text(started))![1]!)
    // Unregister the agent BEFORE the task completes (simulate disconnect).
    unregisterFakeAgents(ctx)
    await expect(ctx.bash.get(id)!.done).resolves.toBeUndefined()
    expect(inject).not.toHaveBeenCalled()
  })

  it('does not notify when no agent owned the task', async () => {
    const ctx = await setup()
    const started = await call(ctx, 'bash', { command: 'true', description: 'test command', run_in_background: true })
    const id = BashTaskId(/task (bash-\d+)/.exec(text(started))![1]!)
    await expect(ctx.bash.get(id)!.done).resolves.toBeUndefined()
  })
})

describe('background task ownership (cross-session isolation)', () => {
  /** Run a tool on behalf of a specific agent (sets exec.agent). */
  function callAs(ctx: Context, agent: import('@deepseek-ai/dsh-agent').Agent | undefined, name: string, args: unknown) {
    return ctx.tools.execute({ callId: CallId(`own-${++callCounter}`), name, arguments: args, ...agent ? { agent } : {} })
  }
  // Ownership is by TOKEN (session.header.id), NOT agent object identity — so
  // each agent needs a DISTINCT session id, else every fake yields the same
  // token and the isolation tests pass for the wrong reason (all tasks owned by
  // the same token). The impl reads `session.header.id`, so the fakes MUST carry
  // it.
  const fakeAgent = (sessionId: string) =>
    ({ inject: () => undefined, session: { header: { version: 0, id: sessionId, createdAt: 0 } } }) as unknown as import('@deepseek-ai/dsh-agent').Agent

  it('rejects bash_output/bash_kill for a task owned by a DIFFERENT session token', async () => {
    const ctx = await setup()
    const a = fakeAgent('sess-a')
    const b = fakeAgent('sess-b')
    // Agent A starts a long-running background task.
    const started = await callAs(ctx, a, 'bash', { command: 'sleep 60', description: 'bg', run_in_background: true })
    const id = BashTaskId(/task (bash-\d+)/.exec(text(started))![1]!)

    // Agent B (a different session token) cannot read or kill A's task.
    const readByB = await callAs(ctx, b, 'bash_output', { task_id: id })
    expect(readByB.isError).toBe(true)
    expect(text(readByB)).toMatch(/belongs to another session/)
    const killByB = await callAs(ctx, b, 'bash_kill', { task_id: id })
    expect(killByB.isError).toBe(true)
    expect(text(killByB)).toMatch(/belongs to another session/)

    // The task is still running (B's kill did nothing) — A can still kill it.
    const killByA = await callAs(ctx, a, 'bash_kill', { task_id: id })
    expect(killByA.isError).toBe(false)
    expect(text(killByA)).toBe(`killed background task ${id}`)
  })

  it('a DIFFERENT Agent object with the SAME session token may access the task (ownership is by token, not object identity)', async () => {
    // Ownership fences by session.header.id, NOT Agent object identity. Two
    // distinct Agent objects sharing one session token (e.g. an agent re-created
    // on the same session) are the SAME owner.
    const ctx = await setup()
    const a1 = fakeAgent('sess-shared')
    const a2 = fakeAgent('sess-shared') // distinct object, same token
    const started = await callAs(ctx, a1, 'bash', { command: 'sleep 60', description: 'bg', run_in_background: true })
    const id = BashTaskId(/task (bash-\d+)/.exec(text(started))![1]!)
    const readByA2 = await callAs(ctx, a2, 'bash_output', { task_id: id })
    expect(readByA2.isError).toBe(false)
    await callAs(ctx, a1, 'bash_kill', { task_id: id }) // cleanup
  })

  it('the no-agent (non-loop) caller cannot access an owned task', async () => {
    const ctx = await setup()
    const a = fakeAgent('sess-a')
    const started = await callAs(ctx, a, 'bash', { command: 'sleep 60', description: 'bg', run_in_background: true })
    const id = BashTaskId(/task (bash-\d+)/.exec(text(started))![1]!)
    // A call with no exec.agent has no token → cannot prove ownership of an owned task.
    const read = await callAs(ctx, undefined, 'bash_output', { task_id: id })
    expect(read.isError).toBe(true)
    expect(text(read)).toMatch(/belongs to another session/)
    await callAs(ctx, a, 'bash_kill', { task_id: id }) // cleanup
  })

  it('an UNOWNED task (started with no agent) is accessible to anyone', async () => {
    const ctx = await setup()
    // Started by a non-loop caller (no exec.agent) → no owner token recorded.
    const started = await callAs(ctx, undefined, 'bash', { command: 'sleep 60', description: 'bg', run_in_background: true })
    const id = BashTaskId(/task (bash-\d+)/.exec(text(started))![1]!)
    // Any agent (and the no-agent caller) may read/kill it.
    const read = await callAs(ctx, fakeAgent('sess-x'), 'bash_output', { task_id: id })
    expect(read.isError).toBe(false)
    const killed = await callAs(ctx, undefined, 'bash_kill', { task_id: id })
    expect(killed.isError).toBe(false)
  })

  it('the owner can still access its task AFTER it completes (owner token persists on the task)', async () => {
    const ctx = await setup()
    const a = fakeAgent('sess-a')
    const b = fakeAgent('sess-b')
    const started = await callAs(ctx, a, 'bash', { command: 'echo done', description: 'bg', run_in_background: true })
    const id = BashTaskId(/task (bash-\d+)/.exec(text(started))![1]!)
    await ctx.bash.get(id)!.done
    // Completion does NOT clear ownership: B is still rejected, A still allowed.
    const readByB = await callAs(ctx, b, 'bash_output', { task_id: id })
    expect(readByB.isError).toBe(true)
    expect(text(readByB)).toMatch(/belongs to another session/)
    const readByA = await callAs(ctx, a, 'bash_output', { task_id: id })
    expect(readByA.isError).toBe(false)
  })

  it('ownership SURVIVES an independent tool-bash HMR reload (token lives on the executor)', async () => {
    // The owner token lives on the TASK inside the executor (dsh-bash fiber), NOT
    // in a tool-bash plugin-local map. So reloading ONLY tool-bash (executor +
    // task survive) preserves ownership. This is the regression guard: a
    // plugin-local map would make B accessible after reload, and this test would
    // catch it.
    const ctx = new Context()
    await ctx.plugin(SystemPrompt)
    await ctx.plugin(ToolRegistry)
    await ctx.plugin(LocalBashExecutor, { timeoutMs: 10_000 })
    ;(ctx.bash as LocalBashExecutor).internals = { spillDir, graceMs: 200 }
    const fiber = await ctx.plugin(ToolBash)

    const a = fakeAgent('sess-a')
    const b = fakeAgent('sess-b')
    const started = await callAs(ctx, a, 'bash', { command: 'sleep 60', description: 'bg', run_in_background: true })
    const id = BashTaskId(/task (bash-\d+)/.exec(text(started))![1]!)
    // Before reload: B is rejected (A owns it).
    expect((await callAs(ctx, b, 'bash_output', { task_id: id })).isError).toBe(true)

    // Reload ONLY tool-bash; the executor and its running task (with its owner
    // token) survive.
    await fiber.dispose()
    await ctx.plugin(ToolBash)
    expect(ctx.bash.get(id)?.status).toBe('running')
    expect(ctx.bash.ownerOf(id)).toBe('sess-a')

    // After reload, ownership is INTACT → B is STILL rejected.
    expect((await callAs(ctx, b, 'bash_output', { task_id: id })).isError).toBe(true)
    await callAs(ctx, a, 'bash_kill', { task_id: id }) // cleanup
  })
})

describe('session-cwd routing (per-session workdir)', () => {
  function callAs(ctx: Context, agent: import('@deepseek-ai/dsh-agent').Agent | undefined, args: unknown) {
    return ctx.tools.execute({ callId: CallId(`cwd-${++callCounter}`), name: 'bash', arguments: args, ...agent ? { agent } : {} })
  }
  // An agent whose session header carries a cwd (what session/new records).
  const agentInCwd = (cwd: string) =>
    ({ inject: () => undefined, session: { header: { version: 0, id: 'c', createdAt: 0, cwd } } }) as unknown as import('@deepseek-ai/dsh-agent').Agent

  it('defaults bash to the agent\'s session cwd (not the server launch dir)', async () => {
    const ctx = await setup()
    const result = await callAs(ctx, agentInCwd('/tmp'), { command: 'pwd', description: 'pwd' })
    expect(text(result).trim()).toMatch(/\/tmp$/)
  })

  it('an explicit absolute workdir overrides the session cwd', async () => {
    const ctx = await setup()
    const result = await callAs(ctx, agentInCwd('/'), { command: 'pwd', description: 'pwd', workdir: '/tmp' })
    expect(text(result).trim()).toMatch(/\/tmp$/)
  })

  it('a relative workdir is resolved against the session cwd', async () => {
    const ctx = await setup()
    // session cwd /usr + relative 'bin' → /usr/bin
    const result = await callAs(ctx, agentInCwd('/usr'), { command: 'pwd', description: 'pwd', workdir: 'bin' })
    expect(text(result).trim()).toMatch(/\/usr\/bin$/)
  })

  it('two sessions with different cwds each run bash in their own dir', async () => {
    const ctx = await setup()
    const inUsr = await callAs(ctx, agentInCwd('/usr'), { command: 'pwd', description: 'pwd' })
    const inTmp = await callAs(ctx, agentInCwd('/tmp'), { command: 'pwd', description: 'pwd' })
    expect(text(inUsr).trim()).toMatch(/\/usr$/)
    expect(text(inTmp).trim()).toMatch(/\/tmp$/)
  })

  it('falls back to the executor default when the agent has no session cwd', async () => {
    const ctx = await setup()
    // No exec.agent at all → executor uses its config/process.cwd() default.
    const result = await ctx.tools.execute({ callId: CallId('cwd-noagent'), name: 'bash', arguments: { command: 'pwd', description: 'pwd' } })
    expect(result.isError).toBe(false)
    expect(text(result).trim().length).toBeGreaterThan(0)
  })
})

describe('renderResult', () => {
  const base = {
    exitCode: 0 as number | null,
    signal: null as NodeJS.Signals | null,
    timedOut: false,
    aborted: false,
    timeoutMs: 1000,
    stdout: { text: '', truncated: false },
    stderr: { text: '', truncated: false },
  }

  it('renders stderr-only output without a stdout prefix', () => {
    expect(renderResult({ ...base, stderr: { text: 'err\n', truncated: false } }))
      .toBe('[stderr]\nerr\n')
  })

  it('adds a separator when stdout does not end with a newline', () => {
    expect(renderResult({
      ...base,
      stdout: { text: 'out', truncated: false },
      stderr: { text: 'err', truncated: false },
    })).toBe('out\n[stderr]\nerr')
  })

  it('appends exit-code markers after a newline for unterminated output', () => {
    expect(renderResult({ ...base, exitCode: 7, stdout: { text: 'x', truncated: false } }))
      .toBe('x\n[exit code: 7]')
  })

  it('renders signal kills without the timeout marker when not timed out', () => {
    expect(renderResult({ ...base, exitCode: null, signal: 'SIGKILL' }))
      .toBe('(no output)\n[killed by signal: SIGKILL]')
  })

  it('reports a timeout that exited 0 (trapped signal) without a kill marker', () => {
    expect(renderResult({ ...base, exitCode: 0, signal: null, timedOut: true }))
      .toBe('(no output)\n[timed out after 1000ms]')
  })

  it('orders the timeout marker before a kill marker', () => {
    expect(renderResult({ ...base, exitCode: null, signal: 'SIGTERM', timedOut: true }))
      .toBe('(no output)\n[timed out after 1000ms]\n[killed by signal: SIGTERM]')
  })

  it('notes truncation with a fallback when the spill path is missing', () => {
    expect(renderResult({ ...base, stdout: { text: 'tail', truncated: true } }))
      .toBe('tail\n[output truncated; full output: (unavailable)]')
  })
})

describe('status lines', () => {
  it('reports kills without a recorded signal (executor raced process exit)', async () => {
    const ctx = await setup()
    const started = await call(ctx, 'bash', { command: 'sleep 60', description: 'test command', run_in_background: true })
    const id = BashTaskId(/task (bash-\d+)/.exec(text(started))![1]!)
    const task = ctx.bash.get(id)!

    await call(ctx, 'bash_kill', { task_id: id })
    await task.done
    // Simulate the variant where the close event carried no signal.
    task.signal = null
    const read = await call(ctx, 'bash_output', { task_id: id })
    expect(text(read)).toContain('[status: killed]')
  })

  it('reports completed tasks with a null exit code as exit 0', async () => {
    const ctx = await setup()
    const started = await call(ctx, 'bash', { command: 'true', description: 'test command', run_in_background: true })
    const id = BashTaskId(/task (bash-\d+)/.exec(text(started))![1]!)
    const task = ctx.bash.get(id)!
    await task.done
    // Defensive: completed tasks always carry an exit code in practice; the
    // ?? 0 fallback covers task shapes from other executor implementations.
    task.exitCode = null
    const read = await call(ctx, 'bash_output', { task_id: id })
    expect(text(read)).toContain('[status: completed, exit code: 0]')
  })
})

describe('tool-owned UI presentation (presentCall / presentResult)', () => {
  it('bash presentCall: title is the command, description as a content block, marks a terminal; workdir → cwd (absolute or relative, bridge resolves)', async () => {
    const ctx = await setup()
    // No explicit workdir → the call still flags a terminal, but with no cwd (the
    // UI bridge fills the session cwd it owns; the pure presenter can't see it).
    // The command is the title (an execute card hides rawInput); the description
    // rides as a content text block (shown above the terminal card).
    expect(ctx.tools.get('bash')?.presentCall?.({ command: 'ls -la src', description: 'List files in src' }))
      .toEqual({ title: 'ls -la src', kind: 'execute', rawInput: 'ls -la src', content: [{ type: 'text', text: 'List files in src' }], terminal: {} })
    // An ABSOLUTE workdir is surfaced verbatim as the terminal cwd header.
    expect(ctx.tools.get('bash')?.presentCall?.({ command: 'pwd', description: 'Print dir', workdir: '/tmp/x' }))
      .toEqual({ title: 'pwd', kind: 'execute', rawInput: 'pwd', content: [{ type: 'text', text: 'Print dir' }], terminal: { cwd: '/tmp/x' } })
    // A RELATIVE workdir is passed through AS-IS (the bridge resolves it against
    // the session cwd, matching where execution runs) — not dropped.
    expect(ctx.tools.get('bash')?.presentCall?.({ command: 'pwd', description: 'Print dir', workdir: 'sub' }))
      .toEqual({ title: 'pwd', kind: 'execute', rawInput: 'pwd', content: [{ type: 'text', text: 'Print dir' }], terminal: { cwd: 'sub' } })
  })

  it('bash presentResult: console-block content AND terminal.output (RAW newlines) + parsed exit code', async () => {
    const ctx = await setup()
    const present = ctx.tools.get('bash')!.presentResult!(
      { command: 'echo hi', description: 'echo' },
      { content: [{ type: 'text', text: 'hi\n[exit code: 0]\n\n' }], isError: false },
    )
    // The fenced ```console content trims trailing blank lines for a tidy block;
    // terminal.output keeps the RAW bytes (newlines intact) a terminal renderer
    // needs; exitCode is parsed back from the [exit code: N] marker.
    expect(present).toEqual({
      content: [{ type: 'text', text: '```console\nhi\n[exit code: 0]\n```' }],
      terminal: { output: 'hi\n[exit code: 0]\n\n', exitCode: 0 },
    })
  })

  it('bash presentResult: a non-zero exit and a signal kill parse into exitCode / signal', async () => {
    const ctx = await setup()
    const args = { command: 'x', description: 'x' }
    const nonzero = ctx.tools.get('bash')!.presentResult!(args, { content: [{ type: 'text', text: 'oops\n[exit code: 3]' }], isError: false })
    expect(nonzero?.terminal).toEqual({ output: 'oops\n[exit code: 3]', exitCode: 3 })
    const killed = ctx.tools.get('bash')!.presentResult!(args, { content: [{ type: 'text', text: 'gone\n[killed by signal: SIGKILL]' }], isError: false })
    expect(killed?.terminal).toEqual({ output: 'gone\n[killed by signal: SIGKILL]', signal: 'SIGKILL' })
  })

  it('bash presentResult exit parse is the inverse of renderResult markers (round-trip)', async () => {
    const ctx = await setup()
    const present = ctx.tools.get('bash')!
    // For each renderResult outcome, the rendered text fed back through
    // presentResult recovers the matching structured exit — the parse and the
    // marker emission co-evolve in one file, so this pins the pair.
    const base = {
      aborted: false,
      timeoutMs: 1000,
      stdout: { text: 'out', truncated: false },
      stderr: { text: '', truncated: false },
    }
    const cases = [
      { result: { ...base, exitCode: 0, signal: null, timedOut: false }, expect: { exitCode: 0 } },
      { result: { ...base, exitCode: 7, signal: null, timedOut: false }, expect: { exitCode: 7 } },
      { result: { ...base, exitCode: null, signal: 'SIGTERM' as const, timedOut: false }, expect: { signal: 'SIGTERM' } },
      // A trapped-timeout run that exits 0 has no signal/exit marker → reads as exit 0 (it did exit 0).
      { result: { ...base, exitCode: 0, signal: null, timedOut: true }, expect: { exitCode: 0 } },
    ]
    for (const c of cases) {
      const rendered = renderResult(c.result)
      const out = present.presentResult!({ command: 'x', description: 'x' }, { content: [{ type: 'text', text: rendered }], isError: false })
      const { output: _o, ...exit } = out?.terminal ?? {}
      expect(exit).toEqual(c.expect)
    }
  })

  it('bash presentResult: a clean exit-0 whose output ENDS in marker-like text is NOT read as a failure', async () => {
    const ctx = await setup()
    const args = { command: 'printf "[exit code: 5]"', description: 'print' }
    // A successful command can print text that looks like a marker. renderResult
    // for a clean exit 0 appends NOTHING (and no trailing newline), so the body's
    // own tail is `[exit code: 5]`. The parse requires a LEADING newline before
    // the marker (renderResult always inserts one before a REAL marker), so this
    // no-trailing-newline body is NOT mistaken for a failure → exitCode 0.
    const out = ctx.tools.get('bash')!.presentResult!(args, { content: [{ type: 'text', text: '[exit code: 5]' }], isError: false })
    expect(out?.terminal).toEqual({ output: '[exit code: 5]', exitCode: 0 })
    // Same for a fake signal marker with no leading newline.
    const sig = ctx.tools.get('bash')!.presentResult!(args, { content: [{ type: 'text', text: '[killed by signal: SIGKILL]' }], isError: false })
    expect(sig?.terminal).toEqual({ output: '[killed by signal: SIGKILL]', exitCode: 0 })
  })

  it('bash presentCall/presentResult: a run_in_background call is NOT a terminal and its ack carries no exit pill', async () => {
    const ctx = await setup()
    // The background start returns a task-id ack, not a streamed run — no terminal.
    const call = ctx.tools.get('bash')!.presentCall!({ command: 'sleep 100', description: 'wait', run_in_background: true })
    expect(call).toEqual({ title: 'sleep 100', kind: 'execute', rawInput: 'sleep 100', content: [{ type: 'text', text: 'wait' }] })
    expect((call as { terminal?: unknown }).terminal).toBeUndefined()
    // The ack result is fenced text only — no terminal output / exit pill.
    const result = ctx.tools.get('bash')!.presentResult!(
      { command: 'sleep 100', description: 'wait', run_in_background: true },
      { content: [{ type: 'text', text: 'started background task bash-1' }], isError: false },
    )
    expect(result?.terminal).toBeUndefined()
    expect(result?.content).toEqual([{ type: 'text', text: '```console\nstarted background task bash-1\n```' }])
  })

  it('bash presentResult: an isError result carries no exit pill (no real process exit to report)', async () => {
    const ctx = await setup()
    // A spawn failure / abort has no process exit — the body is an error message,
    // not renderResult output, so no terminal output/exit is emitted.
    const out = ctx.tools.get('bash')!.presentResult!(
      { command: 'x', description: 'x' },
      { content: [{ type: 'text', text: 'command aborted' }], isError: true },
    )
    expect(out?.terminal).toBeUndefined()
    expect(out?.content).toEqual([{ type: 'text', text: '```console\ncommand aborted\n```' }])
  })

  it('bash presentResult: leaves a non-text (unexpected) result untouched → undefined (UI keeps raw content)', async () => {
    const ctx = await setup()
    const present = ctx.tools.get('bash')!.presentResult!(
      { command: 'x', description: 'x' },
      { content: [{ type: 'image', url: 'https://x/y.png' }], isError: false },
    )
    expect(present).toBeUndefined()
  })

  it('bash presentResult: a result that is not exactly one block → undefined (no single text to fence)', async () => {
    const ctx = await setup()
    const args = { command: 'x', description: 'x' }
    // Empty content (no block) and multi-block content both fall through.
    expect(ctx.tools.get('bash')!.presentResult!(args, { content: [], isError: false })).toBeUndefined()
    expect(ctx.tools.get('bash')!.presentResult!(args, {
      content: [{ type: 'text', text: 'a' }, { type: 'text', text: 'b' }],
      isError: false,
    })).toBeUndefined()
  })

  it('bash_output / bash_kill presentCall: a readable task-scoped title, task id as rawInput', async () => {
    const ctx = await setup()
    expect(ctx.tools.get('bash_output')!.presentCall!({ task_id: 'bash-3' }))
      .toEqual({ title: 'Read output from background task bash-3', kind: 'execute', rawInput: 'bash-3' })
    expect(ctx.tools.get('bash_kill')!.presentCall!({ task_id: 'bash-3' }))
      .toEqual({ title: 'Kill background task bash-3', kind: 'execute', rawInput: 'bash-3' })
  })

  it('presentCall validates softly: malformed args (missing required description) return undefined, never throw', async () => {
    const ctx = await setup()
    // defineTool wraps presentCall to soft-validate against the schema and fall
    // back to undefined (a generic UI presentation) rather than throwing on the
    // display path — it may run on replay of arbitrary logged args. The
    // ToolDefinition.presentCall takes `unknown`, so a malformed shape needs no cast.
    expect(ctx.tools.get('bash')?.presentCall?.({ command: 'ls' })).toBeUndefined()
  })
})
