/**
 * GYXX 工作台面板 —— 极简外部存储（避免向客户端包引入额外依赖）。
 * React 18 的 useSyncExternalStore 直接订阅。
 */

const listeners = new Set()

let state = {
  open: false,
  loading: false,
  error: null,
  generatedAt: null,
  summary: null,
  workflows: [],
  selectedId: null,
  detail: null,
  detailLoading: false,
  runs: [],
  diagnosis: null,
  diagnosisLoading: false,
  question: '',
  businessDate: defaultBusinessDate(),
  alerts: [],
  seenAlertIds: {},
  toasts: [],
}

export function defaultBusinessDate() {
  const now = new Date()
  now.setDate(now.getDate() - 1)
  const pad = (value) => String(value).padStart(2, '0')
  return `${now.getFullYear()}-${pad(now.getMonth() + 1)}-${pad(now.getDate())}`
}

export function getState() {
  return state
}

export function update(patch) {
  state = { ...state, ...patch }
  for (const listener of listeners) listener()
}

export function subscribe(listener) {
  listeners.add(listener)
  return () => listeners.delete(listener)
}

export function pushToast(toast) {
  const id = `t-${Date.now().toString(36)}-${Math.random().toString(36).slice(2, 6)}`
  update({ toasts: [...state.toasts, { id, ...toast }] })
  return id
}

export function dismissToast(id) {
  update({ toasts: state.toasts.filter((toast) => toast.id !== id) })
}