import type { InjectionKey } from 'vue'
import type { JobInfo, ProjectEvent } from '#shared/types'

/** 项目工作区的共享状态：数据 + SSE 实时事件 */
export function createProjectStore(projectId: string) {
  const api = useApi()
  const project = ref<ProjectDetail | null>(null)
  const chapters = ref<ChapterListItem[]>([])
  const agents = ref<AgentItem[]>([])
  const models = ref<ModelItem[]>([])
  const jobs = ref<JobInfo[]>([])
  const running = ref(false)
  const runningLabel = ref('')
  const connected = ref(false)
  /** 正在写作的章节实时文本：chapterId → { versionId, text } */
  const live = reactive<Record<string, { versionId: string, text: string }>>({})
  /** 章节变更计数，章节详情组件据此刷新 */
  const chapterRev = reactive<Record<string, number>>({})

  const refreshProject = async () => { project.value = await api.get<ProjectDetail>(`/api/projects/${projectId}`) }
  const refreshChapters = async () => { chapters.value = await api.get<ChapterListItem[]>(`/api/projects/${projectId}/chapters`) }
  const refreshAgents = async () => { agents.value = await api.get<AgentItem[]>(`/api/projects/${projectId}/agents`) }
  const refreshModels = async () => { models.value = await api.get<ModelItem[]>('/api/models') }
  const refreshJobs = async () => { jobs.value = await api.get<JobInfo[]>(`/api/projects/${projectId}/jobs?limit=100`) }

  let chapterTimer: ReturnType<typeof setTimeout> | null = null
  const refreshChaptersSoon = () => {
    if (chapterTimer) clearTimeout(chapterTimer)
    chapterTimer = setTimeout(() => { refreshChapters().catch(() => {}) }, 150)
  }

  function handle(e: ProjectEvent) {
    switch (e.type) {
      case 'job': {
        const i = jobs.value.findIndex(j => j.id === e.job.id)
        if (i >= 0) jobs.value[i] = e.job
        else jobs.value = [e.job, ...jobs.value].slice(0, 200)
        if (e.job.status === 'error') {
          api.toast.add({ title: `${e.job.agentName || '任务'}出错`, description: e.job.error.slice(0, 300), color: 'error', icon: 'i-lucide-circle-alert' })
        }
        break
      }
      case 'delta': {
        const cur = live[e.chapterId]
        if (!cur || cur.versionId !== e.versionId) live[e.chapterId] = { versionId: e.versionId, text: e.text }
        else cur.text += e.text
        break
      }
      case 'chapter':
        chapterRev[e.chapterId] = (chapterRev[e.chapterId] ?? 0) + 1
        refreshChaptersSoon()
        break
      case 'chapters':
        refreshChaptersSoon()
        break
      case 'agents':
        refreshAgents().catch(() => {})
        break
      case 'pipeline':
        running.value = e.running
        runningLabel.value = e.message ?? ''
        if (!e.running) {
          refreshProject().catch(() => {})
          refreshChaptersSoon()
        }
        break
      case 'log':
        api.toast.add({ title: e.level === 'error' ? '出错了' : '提示', description: e.message.slice(0, 400), color: e.level === 'error' ? 'error' : e.level === 'warn' ? 'warning' : 'info' })
        break
    }
  }

  let source: EventSource | null = null
  function connect() {
    if (source) return
    source = new EventSource(`/api/projects/${projectId}/events`)
    source.onopen = () => {
      connected.value = true
      // 断线重连后补齐可能错过的状态
      refreshChapters().catch(() => {})
      refreshJobs().catch(() => {})
    }
    source.onerror = () => { connected.value = false }
    source.onmessage = (msg) => {
      try { handle(JSON.parse(msg.data) as ProjectEvent) }
      catch (err) { console.error('bad event', err) }
    }
  }
  function disconnect() {
    source?.close()
    source = null
    connected.value = false
  }

  async function load() {
    await Promise.all([refreshProject(), refreshChapters(), refreshAgents(), refreshModels(), refreshJobs()])
    running.value = Boolean(project.value?.running)
    runningLabel.value = project.value?.running?.label ?? ''
  }

  async function saveProject(patch: Record<string, unknown>) {
    project.value = { ...project.value!, ...(await api.put<ProjectDetail>(`/api/projects/${projectId}`, patch)), running: project.value?.running ?? null }
  }

  async function run() { await api.post(`/api/projects/${projectId}/run`) }
  async function stop() { await api.post(`/api/projects/${projectId}/stop`) }

  return {
    projectId, project, chapters, agents, models, jobs, running, runningLabel, connected, live, chapterRev,
    load, connect, disconnect, refreshProject, refreshChapters, refreshAgents, refreshModels, refreshJobs, saveProject, run, stop
  }
}

export type ProjectStore = ReturnType<typeof createProjectStore>
export const projectStoreKey: InjectionKey<ProjectStore> = Symbol('project-store')

export function useProjectStore() {
  const store = inject(projectStoreKey)
  if (!store) throw new Error('useProjectStore 必须在项目页面内使用')
  return store
}