/** The seven Main agent goal cases use overlaid documents and the loaded server modules. */
import type { ConversationId, GenerationHooks, Tx } from '@earendil-works/pi-durable'
import { BACKGROUND_CONTEXT } from '@earendil-works/chord/context'
import { expect, it } from './goal-questions-test-support'
const { reminderTask } = await import(`${globalThis.goalBase}/goal/reminder.ts`)
const {default:goalExtension,act,actions,end,Goals,openGoal,start,TRIES} = await import(`${globalThis.goalBase}/goal/server.ts`)
import type { Host } from './extensions.ts'

const MAIN_AGENT = 5 as ConversationId
const screenshot = { type: 'image', data: 'aGk=', mimeType: 'image/png' }

/** Like the harness's document overlay, a proxy at every level: structuredClone refuses it. */
const overlay = <T extends object>(value: T): T =>
  new Proxy(value, {
    get: (target, key) => {
      const found = Reflect.get(target, key) as unknown
      return found && typeof found === 'object' ? overlay(found) : found
    },
  })

/** A transaction over overlaid documents and a few entries of @mainAgent's conversation; @mainAgent is conversation 5. */
function fakeTx(
  newer: { id: number; conversationId: number; kind?: string; model: object[] }[] = [],
) {
  const docs = new Map<string, object>()
  const entries = [
    ...newer,
    { id: 30, conversationId: MAIN_AGENT, model: [{ role: 'user', content: 'no images' }] },
    {
      id: 20,
      conversationId: MAIN_AGENT,
      model: [{ role: 'toolResult', content: [{ type: 'text', text: 'shot' }, screenshot] }],
    },
    { id: 10, conversationId: 9, model: [{ role: 'user', content: [screenshot] }] },
  ]
  const tasks: { name: string; input: { kind: string; content: string; to: number } }[] = []
  return {
    tasks,
    createTask: async ({ definition }: { definition: { name: string } }, input: never) => {
      tasks.push({ name: definition.name, input })
    },
    doc: async (
      { definition: def }: { definition: { kind: string; initial: () => object } },
      id: number,
    ) => {
      const key = `${def.kind}:${id}`
      if (!docs.has(key))
        docs.set(
          key,
          def.kind === 'main-agent.index' ? { '$main-agent': MAIN_AGENT } : def.initial(),
        )
      return overlay(docs.get(key)!)
    },
    entry: async (id: number) => entries.find((entry) => entry.id === id),
    scanEntries: async ({ conversationId }: { conversationId: number }) => ({
      items: entries.filter((entry) => entry.conversationId === conversationId),
    }),
  } as unknown as Tx & { tasks: typeof tasks }
}

type Reminder = {
  id: string
  name: string
  enabled: boolean
  subscribers?: (number | string)[]
  key?: string
}

/** A host over `tx` with an automations ledger, and `sync()`, which runs the queued reminder tasks. */
function fakeHost(tx: ReturnType<typeof fakeTx>) {
  const ledger = new Map<string, Reminder>()
  let next = 1
  const service = {
    // As the real service: a repeated key returns the automation it made.
    create: async (args: Omit<Reminder, 'id' | 'enabled'>) => {
      const made = [...ledger.values()].find((item) => args.key && item.key === args.key)
      if (made) return made
      const id = `A${next++}`
      ledger.set(id, { id, ...args, enabled: true })
      return ledger.get(id)
    },
    delete: async (id: string) => void ledger.delete(id),
    pause: async (id: string) => void (ledger.get(id)!.enabled = false),
    resume: async (id: string) => void (ledger.get(id)!.enabled = true),
    operate: async (args: any) => args.action === 'list' ? structuredClone([...ledger.values()]) : (service as any)[args.action](args.action === 'create' ? Object.fromEntries(Object.entries(args).filter(([key]) => key !== 'action')) : args.id),
  }
  const host = {
    harness: () => ({ commit: (fn: (tx: Tx) => unknown) => fn(tx) }),
    need: () => service,
    want: () => service,
    doc: () => undefined,
    invoke: async () => structuredClone([...ledger.values()]),
  } as unknown as Host
  const sync = async () => {
    const runtime = { commit: (fn: () => unknown) => fn() }
    for (const task of tx.tasks.splice(0).filter((item) => item.name === 'goal.reminder'))
      await reminderTask(host, Goals).definition.phases.sync(
        { input: task.input } as never,
        runtime as never,
        BACKGROUND_CONTEXT,
      )
  }
  return { host, ledger, service, sync }
}

it('keeps one goal open at a time and ends it once', async () => {
  const tx = fakeTx()
  await expect(start(tx, '  ', 0)).rejects.toThrow('nonempty')
  expect(await start(tx, ' Ship the sidebar ', 0)).toMatchObject({
    id: 1,
    text: 'Ship the sidebar',
  })
  await expect(start(tx, 'Another', 0)).rejects.toThrow('Goal 1 is still open')
  expect(await end(tx, { at: 1, by: 'user', outcome: 'ended' })).toMatchObject({
    ended: { by: 'user' },
  })
  await expect(end(tx, { at: 2, by: 'user', outcome: 'ended' })).rejects.toThrow('No goal')
  expect((await start(tx, 'Next', 3)).id).toBe(2)
})

it('blocks a criterion after repeated failed tries and finishes with the outcome', async () => {
  const tx = fakeTx()
  await expect(act(tx, MAIN_AGENT, { action: 'met', n: 1 }, 0)).rejects.toThrow('No hands-off goal')
  await start(tx, 'Goal', 0)
  await act(tx, MAIN_AGENT, { action: 'criteria', criteria: ['Loads in 1s', 'Tests pass'] }, 0)
  await expect(act(tx, MAIN_AGENT, { action: 'met', n: 3 }, 0)).rejects.toThrow('No criterion 3')
  for (let i = 1; i < TRIES; i++) await act(tx, MAIN_AGENT, { action: 'failed', n: 1 }, 0)
  expect((await openGoal(tx))!.criteria[0]).toMatchObject({ status: 'open', tries: TRIES - 1 })
  const last = await act(tx, MAIN_AGENT, { action: 'failed', n: 1 }, 0)
  expect(last.answer).toContain('blocked')
  expect((await openGoal(tx))!.criteria[0].status).toBe('blocked')
  // Rewording keeps what was learned about an unchanged criterion.
  await act(tx, MAIN_AGENT, { action: 'criteria', criteria: ['Loads in 1s', 'Lint passes'] }, 0)
  expect((await openGoal(tx))!.criteria.map((item) => item.status)).toEqual(['blocked', 'open'])
  await expect(act(tx, MAIN_AGENT, { action: 'finish', summary: 'x' }, 0)).rejects.toThrow('outcome')
  const done = await act(
    tx,
    MAIN_AGENT,
    { action: 'finish', outcome: 'blocked', summary: 'Stuck' },
    4,
  )
  expect(done.ended).toMatchObject({
    ended: { by: 'mainAgent', outcome: 'blocked', summary: 'Stuck' },
  })
  expect(await openGoal(tx)).toBeUndefined()
})

it('records decisions with the screenshots of its own conversation only', async () => {
  const tx = fakeTx()
  await start(tx, 'Goal', 0)
  await expect(
    act(tx, MAIN_AGENT, { action: 'decide', question: 'Go?', picked: 'Yes' }, 0),
  ).rejects.toThrow('reason')
  await act(
    tx,
    MAIN_AGENT,
    {
      action: 'decide',
      question: 'Approve?',
      picked: 'Yes',
      reason: 'Meets 1',
      conversation: 7,
      images: 'latest',
    },
    1,
  )
  await expect(
    act(tx, MAIN_AGENT, { action: 'decide', question: 'q', picked: 'p', reason: 'r', images: 10 }, 2),
  ).rejects.toThrow('has no images')
  expect((await openGoal(tx))!.decisions).toEqual([
    { at: 1, question: 'Approve?', picked: 'Yes', reason: 'Meets 1', conversation: 7, images: 20 },
  ])
})

it('never takes an earlier turn\'s screenshot for images: "latest"', async () => {
  const tx = fakeTx([{ id: 40, kind: 'pi.user', conversationId: MAIN_AGENT, model: [] }])
  await start(tx, 'Goal', 0)
  const decide = { action: 'decide', question: 'q', picked: 'p', reason: 'r' } as const
  await expect(act(tx, MAIN_AGENT, { ...decide, images: 'latest' }, 1)).rejects.toThrow(
    'no images in this turn',
  )
  await act(tx, MAIN_AGENT, { ...decide, images: 20 }, 2)
  expect((await openGoal(tx))!.decisions).toMatchObject([{ images: 20 }])
})

it("notes the open goal on @mainAgent's runs only, and lets only @mainAgent keep it", async () => {
  const tx = fakeTx()
  const extension = goalExtension({
    doc: () => undefined,
    need: () => undefined,
    want: () => undefined,
  } as unknown as Host)
  const hooks = extension.hooks![0].handlers as GenerationHooks
  const before = (conversationId: number, kind = 'pi.user') =>
    hooks.beforeInput({ kind }, { tx, conversationId } as never, BACKGROUND_CONTEXT)
  expect(await before(MAIN_AGENT)).toBeUndefined()
  await start(tx, 'Make it fast', 0)
  expect(await before(9)).toBeUndefined()
  const note = (await before(MAIN_AGENT))!.entries![0]
  expect(note.kind).toBe('goal.note')
  expect(note.model![0].content).toContain(
    'Hands-off goal 1, granted by the user, who is away: Make it fast',
  )

  const tool = extension.tools!.find((candidate) => candidate.name === 'goal')!
  const run = (conversationId: number, args: object) =>
    tool.execute(
      args as never,
      { conversationId, commit: (fn: (tx: Tx) => unknown) => fn(tx) } as never,
      undefined as never,
    )
  await expect(run(9, { action: 'met', n: 1 })).rejects.toThrow('Only the main agent')
  expect(await run(MAIN_AGENT, { action: 'criteria', criteria: ['Fast'] })).toEqual({
    content: [{ type: 'text', text: 'Goal 1 has 1 criteria.' }],
  })
  expect((await tx.doc(Goals, 1 as ConversationId)).goals[0].criteria).toHaveLength(1)

  // Finishing ends the goal and creates the report's delivery in the same commit; the note stops.
  await run(MAIN_AGENT, { action: 'finish', outcome: 'met', summary: 'Done' })
  expect(tx.tasks).toEqual([
    { name: 'goal.deliver', input: expect.objectContaining({ to: MAIN_AGENT, kind: 'goal.report' }) },
    { name: 'goal.reminder', input: { goal: 1 } },
  ])
  expect(await before(MAIN_AGENT)).toBeUndefined()
})

it('keeps a reminder while the goal is open: paused while waiting on the user, gone once ended', async () => {
  const tx = fakeTx()
  const { host, ledger, service, sync } = fakeHost(tx)
  const extension = goalExtension(host)
  const tool = extension.tools!.find((candidate) => candidate.name === 'goal')!
  const run = (args: object) =>
    tool.execute(
      args as never,
      { conversationId: MAIN_AGENT, commit: (fn: (tx: Tx) => unknown) => fn(tx) } as never,
      undefined as never,
    )
  await actions.start({ text: 'Make it fast' }, { host } as never)
  // A crash after creating, before linking, left one; and the goal was paused meanwhile. The task run adopts it by
  // its key instead of making a second one, and pauses it.
  await service.create({
    name: 'Goal reminder · goal 1',
    subscribers: ['@mainAgent'],
    key: 'goal.reminder:1',
  })
  ;(await openGoal(tx))!.waiting = { reason: 'Which account?', at: 0 }
  await sync()
  expect([...ledger.values()]).toEqual([
    {
      id: 'A1',
      name: 'Goal reminder · goal 1',
      subscribers: ['@mainAgent'],
      key: 'goal.reminder:1',
      enabled: false,
    },
  ])
  expect((await openGoal(tx))!.reminder).toBe('A1')
  await run({ action: 'resume' })
  await sync()
  expect(ledger.get('A1')!.enabled).toBe(true)
  // The user renamed it: it stays linked by its id.
  ledger.get('A1')!.name = 'Night check'

  // Its fire tells @mainAgent what to check; other inputs do not.
  const hooks = extension.hooks![0].handlers as GenerationHooks
  const note = async (input: object) =>
    (await hooks.beforeInput(input as never, { tx, conversationId: MAIN_AGENT }, BACKGROUND_CONTEXT))!
      .entries![0].model![0].content as string
  expect(await note({ kind: 'automations.fired', data: { id: 'A1' } })).toContain(
    'This is the goal reminder',
  )
  expect(await note({ kind: 'pi.user' })).not.toContain('This is the goal reminder')
  expect(await note({ kind: 'pi.user', model: [{ role: 'user', content: '[automation A1 fired] Night check' }] })).toContain('This is the goal reminder')
  expect(await note({ kind: 'pi.user', model: [{ role: 'user', content: '[automation A2 fired] Other check' }] })).not.toContain('This is the goal reminder')

  await expect(run({ action: 'pause' })).rejects.toThrow('reason')
  await expect(run({ action: 'resume' })).rejects.toThrow('not paused')
  await run({ action: 'pause', reason: 'Which account to deploy to?' })
  await sync()
  expect(ledger.get('A1')!.enabled).toBe(false)
  expect((await openGoal(tx))!.waiting).toMatchObject({ reason: 'Which account to deploy to?' })
  expect(await note({ kind: 'pi.user' })).toContain('Waiting on the user')
  await run({ action: 'resume' })
  await sync()
  expect(ledger.get('A1')!.enabled).toBe(true)
  expect((await openGoal(tx))!.waiting).toBeUndefined()

  await run({ action: 'finish', outcome: 'met', summary: 'Done' })
  await sync()
  expect(ledger.size).toBe(0)
  // A start and end whose tasks run only after both committed make nothing.
  await actions.start({ text: 'Again' }, { host } as never)
  await actions.end(null, { host } as never)
  await sync()
  expect(ledger.size).toBe(0)
})

it('grants nothing through a start card still queued after the user ended its goal', async () => {
  const tx = fakeTx()
  const { host } = fakeHost(tx)
  const extension = goalExtension(host)
  await actions.start({ text: 'Make it fast' }, { host } as never)
  await actions.end(null, { host } as never)
  const [started, report] = tx.tasks
    .filter((task) => task.name === 'goal.deliver')
    .map((task) => task.input)
  expect(started).toMatchObject({
    kind: 'goal.started',
    content: 'The user started hands-off goal 1.',
  })
  expect(report).toMatchObject({ kind: 'goal.report' })
  expect(report.content).toContain('ask them as usual')
  // The queued start runs now: no goal is open, so no note says to decide for the user.
  const hooks = extension.hooks![0].handlers as GenerationHooks
  expect(
    await hooks.beforeInput(
      { kind: 'goal.started' },
      { tx, conversationId: MAIN_AGENT },
      BACKGROUND_CONTEXT,
    ),
  ).toBeUndefined()
})