import { atom } from 'nanostores'

import type { ActiveTool, ActivityItem, Msg, SubagentProgress } from '../types.js'

const buildTurnState = (): TurnState => ({
  activity: [],
  outcome: '',
  reasoning: '',
  reasoningActive: false,
  reasoningStreaming: false,
  reasoningTokens: 0,
  streamPendingTools: [],
  streamSegments: [],
  streaming: '',
  subagents: [],
  toolTokens: 0,
  tools: [],
  turnTrail: []
})

export const $turnState = atom<TurnState>(buildTurnState())

export const getTurnState = () => $turnState.get()

export const patchTurnState = (next: Partial<TurnState> | ((state: TurnState) => TurnState)) =>
  $turnState.set(typeof next === 'function' ? next($turnState.get()) : { ...$turnState.get(), ...next })

export const resetTurnState = () => $turnState.set(buildTurnState())

export interface TurnState {
  activity: ActivityItem[]
  outcome: string
  reasoning: string
  reasoningActive: boolean
  reasoningStreaming: boolean
  reasoningTokens: number
  streamPendingTools: string[]
  streamSegments: Msg[]
  streaming: string
  subagents: SubagentProgress[]
  toolTokens: number
  tools: ActiveTool[]
  turnTrail: string[]
}