import test from 'node:test'
import assert from 'node:assert/strict'
import * as plugin from '../index.js'

function harness(replies, config = {}) {
  const listeners = new Map()
  const on = (n, f) => { listeners.set(n, [...(listeners.get(n) ?? []), f]); return () => listeners.set(n, listeners.get(n).filter((x) => x !== f)) }
  const prompts = []
  const llm = {
    async *stream(opts) {
      prompts.push(opts)
      const r = replies.shift() ?? '{"verdict":"ok","message":""}'
      yield { type: 'text-delta', text: r }
      yield { type: 'finish', reason: { kind: 'stop' } }
    },
  }
  const events = []
  const session = {
    header: { cwd: '/w' },
    requestHeader: () => ({ config: { provider: 'omni', model: 'main-model' } }),
    surface: { get nodes() { return events.map((_, i) => i) } },
    eventAt: (i) => events[i],
    deriveEventMessage: (e) => e.msg,
  }
  const steered = []
  const agent = { session, ctx: { on }, steer: (m) => steered.push(m) }
  const ctx = { agents: { list: () => [] }, llm, on, effect() {} }
  plugin.apply(ctx, { minLevel: 'note', blocking: true, ...config })
  for (const f of listeners.get('agent/created') ?? []) f({ agent })
  const preStep = async (step) => {
    let out
    for (const f of listeners.get('agent/pre-step') ?? []) out = await f({ agent, messages: [], step, turn: 1 }, async () => ({ kind: 'enter', messages: [] }))
    return out
  }
  const stopTurn = async () => { for (const f of listeners.get('agent/turn-stopping') ?? []) await f({ agent, turn: 1 }) }
  const add = (role, content) => events.push({ msg: { role, content } })
  return { preStep, stopTurn, add, steered, prompts }
}

test('parseVerdict', () => {
  assert.deepEqual(plugin.parseVerdict('x {"verdict":"Concern","message":"m"} y'), { verdict: 'concern', message: 'm' })
  assert.equal(plugin.parseVerdict('nope'), null)
  assert.equal(plugin.parseVerdict('{"verdict":"maybe"}'), null)
})

test('a concern is injected into the next step as a system reminder', async () => {
  const h = harness(['{"verdict":"concern","message":"You deleted tests/ without asking."}'])
  h.add('user', [{ type: 'text', text: 'clean up the repo' }])
  h.add('assistant', [{ type: 'tool-call', name: 'bash', arguments: { command: 'rm -rf tests/' } }])
  h.add('tool', [{ type: 'text', text: '' }])
  const d = await h.preStep(2)
  assert.equal(d.kind, 'enter')
  const text = d.messages.at(-1).content[0].text
  assert.match(text, /Advisor concern\] You deleted tests\/ without asking/)
  assert.equal(h.prompts[0].model, 'main-model')
  assert.match(h.prompts[0].messages[0].content[0].text, /rm -rf tests/)
})

test('ok verdicts inject nothing; first step is never reviewed', async () => {
  const h = harness(['{"verdict":"ok","message":""}'])
  h.add('user', [{ type: 'text', text: 'hi' }])
  assert.equal((await h.preStep(1)).messages.length, 0)
  assert.equal(h.prompts.length, 0)
  assert.equal((await h.preStep(2)).messages.length, 0)
})

test('blocker at turn end steers the agent', async () => {
  const h = harness(['{"verdict":"blocker","message":"Do not push: tests are failing."}'], { blocking: false })
  h.add('user', [{ type: 'text', text: 'ship it' }])
  h.add('assistant', [{ type: 'tool-call', name: 'forge_push', arguments: {} }])
  await h.preStep(2) // review starts in background
  await new Promise((r) => setTimeout(r, 50))
  await h.stopTurn()
  assert.equal(h.steered.length, 1)
  assert.match(h.steered[0].content[0].text, /ADVISOR BLOCKER.*Do not push/s)
})

test('minLevel filters notes and duplicates are suppressed', async () => {
  const h = harness(['{"verdict":"note","message":"tiny"}', '{"verdict":"concern","message":"same"}', '{"verdict":"concern","message":"same"}'], { minLevel: 'concern' })
  h.add('user', [{ type: 'text', text: 'x' }])
  assert.equal((await h.preStep(2)).messages.length, 0) // note < minLevel: dropped
  assert.equal((await h.preStep(3)).messages.length, 1) // concern (blocking review) delivered
  assert.equal((await h.preStep(4)).messages.length, 0) // identical concern suppressed
})