import { nextCursor, slackRequest } from './request.ts'
import { boundedLimit, inputRecord, optionalBoolean, optionalString, requiredString } from './validation.ts'

type RepliesResponse = {
  ok: boolean
  messages?: unknown[]
  has_more?: boolean
  response_metadata?: { next_cursor?: string }
  [key: string]: unknown
}

/** Read a Slack message thread available to the user. */
export default async function getReplies(params: Record<string, unknown>) {
  const input = inputRecord(params)
  const result = await slackRequest<RepliesResponse>('conversations.replies', {
    channel: requiredString(input, 'channel'),
    ts: requiredString(input, 'ts'),
    limit: boundedLimit(input.limit),
    cursor: optionalString(input, 'cursor'),
    oldest: optionalString(input, 'oldest'),
    latest: optionalString(input, 'latest'),
    inclusive: optionalBoolean(input, 'inclusive'),
  })

  return {
    messages: result.messages ?? [],
    hasMore: result.has_more === true,
    nextCursor: nextCursor(result),
  }
}