import { expect, test } from 'bun:test'

import { createUserMessage } from './messages.ts'
import { applyToolResultReplacementsToMessages } from './toolResultStorage.ts'

test('applyToolResultReplacementsToMessages replaces matching tool results and preserves unrelated messages', () => {
  const unrelated = createUserMessage({ content: 'keep me' })
  const oversizedResult = createUserMessage({
    content: [
      {
        type: 'tool_result',
        tool_use_id: 'tool-1',
        content: 'very large tool output',
        is_error: false,
      },
    ],
  })
  const messages = [unrelated, oversizedResult]
  const replacement =
    '<persisted-output>\nOutput too large. Preview\n</persisted-output>'

  const next = applyToolResultReplacementsToMessages(
    messages,
    new Map([['tool-1', replacement]]),
  )

  expect(next).not.toBe(messages)
  expect(next[0]).toBe(unrelated)
  expect(next[1]).not.toBe(oversizedResult)
  expect((next[1]!.message.content as Array<{ content: string }>)[0]!.content).toBe(
    replacement,
  )
})

test('applyToolResultReplacementsToMessages is idempotent when messages are already hydrated', () => {
  const hydrated = createUserMessage({
    content: [
      {
        type: 'tool_result',
        tool_use_id: 'tool-1',
        content: '<persisted-output>\nPreview\n</persisted-output>',
        is_error: false,
      },
    ],
  })
  const messages = [hydrated]

  const next = applyToolResultReplacementsToMessages(
    messages,
    new Map([['tool-1', '<persisted-output>\nPreview\n</persisted-output>']]),
  )

  expect(next).toBe(messages)
})