import { reactive, computed } from 'vue'
import { invoke } from '@tauri-apps/api/core'
import { projectApi, taskApi, ideaApi, workflowApi } from '../api'
import type { ProjectRecord, TaskRecord, IdeaRecord, WorkflowRecord, WorkflowEventPayload } from '../api/types'

// ── 全局响应式状态（单例） ──

const state = reactive({
  projects: [] as ProjectRecord[],
  deletedProjects: [] as ProjectRecord[],
  tasks: [] as TaskRecord[],
  ideas: [] as IdeaRecord[],
  workflowExecutions: [] as WorkflowRecord[],
  liveEvents: [] as WorkflowEventPayload[],
  pendingApproval: null as {
    execution_id: string
    node_id: string
    title: string
    description: string
    options: string[]
  } | null,
  loading: false,
  error: null as string | null,
})

let _eventUnlisten: (() => void) | null = null

function createStore() {
  // ── 项目 CRUD ──
  async function loadProjects() {
    state.loading = true
    state.error = null
    try {
      state.projects = await projectApi.list()
    } catch (e: any) {
      state.error = e?.toString() ?? '加载项目失败'
    } finally {
      state.loading = false
    }
  }

  // 清除错误状态(供 toast 显示后重置,允许连续同值错误再次触发 watch)
  function clearError() { state.error = null }

  async function createProject(name: string, description = '', ideaId?: string, path?: string, stack?: string) {
    try {
      const record = await projectApi.create({ name, description, idea_id: ideaId, path, stack })
      state.projects.push(record)
      return record
    } catch (e: any) {
      state.error = e?.toString() ?? '创建项目失败'
      return null
    }
  }

  async function updateProject(id: string, field: string, value: string) {
    await projectApi.update(id, field, value)
    const idx = state.projects.findIndex(p => p.id === id)
    if (idx >= 0) {
      (state.projects[idx] as any)[field] = value
    }
  }

  /** 重定位项目目录(后端重探测 stack,返回最新记录并更新本地状态) */
  async function relocateProjectPath(id: string, newPath: string) {
    const record = await projectApi.relocatePath(id, newPath)
    const idx = state.projects.findIndex(p => p.id === id)
    if (idx >= 0) state.projects[idx] = record
    return record
  }

  async function deleteProject(id: string) {
    try {
      await projectApi.delete(id) // 软删 → 回收站(可恢复)
      state.projects = state.projects.filter(p => p.id !== id)
    } catch (e: any) {
      state.error = e?.toString() ?? '删除项目失败'
    }
  }

  async function loadDeletedProjects() {
    try {
      state.deletedProjects = await projectApi.listDeleted()
    } catch (e: any) {
      state.error = e?.toString() ?? '加载回收站失败'
    }
  }

  async function restoreProject(id: string) {
    try {
      await projectApi.restore(id)
      state.deletedProjects = state.deletedProjects.filter(p => p.id !== id)
      await loadProjects() // 恢复后刷新活跃列表
    } catch (e: any) {
      state.error = e?.toString() ?? '恢复项目失败'
    }
  }

  async function purgeProject(id: string) {
    try {
      await projectApi.purge(id) // 彻底删(级联物理删,不可恢复)
      state.deletedProjects = state.deletedProjects.filter(p => p.id !== id)
    } catch (e: any) {
      state.error = e?.toString() ?? '彻底删除失败'
    }
  }

  // ── 任务 CRUD ──
  async function loadTasks(projectId?: string) {
    try {
      state.tasks = await taskApi.list(projectId)
    } catch (e: any) {
      state.error = e?.toString() ?? '加载任务失败'
    }
  }

  async function createTask(input: { project_id: string; title: string; description?: string; priority?: number; branch_name?: string; assignee?: string }) {
    try {
      const record = await taskApi.create(input)
      state.tasks.push(record)
      return record
    } catch (e: any) {
      state.error = e?.toString() ?? '创建任务失败'
      return null
    }
  }

  async function updateTask(id: string, field: string, value: string) {
    await taskApi.update(id, field, value)
    const idx = state.tasks.findIndex(t => t.id === id)
    if (idx >= 0) {
      (state.tasks[idx] as any)[field] = value
    }
  }

  async function deleteTask(id: string) {
    try {
      await taskApi.delete(id)
      state.tasks = state.tasks.filter(t => t.id !== id)
    } catch (e: any) {
      state.error = e?.toString() ?? '删除任务失败'
    }
  }

  // ── 灵感 CRUD ──
  async function loadIdeas() {
    try {
      state.ideas = await ideaApi.list()
    } catch (e: any) {
      state.error = e?.toString() ?? '加载灵感失败'
    }
  }

  async function createIdea(input: { title: string; description?: string; priority?: number; tags?: string; source?: string }) {
    try {
      const record = await ideaApi.create(input)
      state.ideas.push(record)
      return record
    } catch (e: any) {
      state.error = e?.toString() ?? '创建灵感失败'
      return null
    }
  }

  async function updateIdea(id: string, field: string, value: string) {
    await ideaApi.update(id, field, value)
    const idx = state.ideas.findIndex(i => i.id === id)
    if (idx >= 0) {
      (state.ideas[idx] as any)[field] = value
    }
  }

  async function deleteIdea(id: string) {
    try {
      await ideaApi.delete(id)
      state.ideas = state.ideas.filter(i => i.id !== id)
    } catch (e: any) {
      state.error = e?.toString() ?? '删除灵感失败'
    }
  }

  async function evaluateIdea(id: string) {
    const record = await ideaApi.evaluate(id)
    const idx = state.ideas.findIndex(i => i.id === id)
    if (idx >= 0) state.ideas[idx] = record
    return record
  }

  async function promoteIdea(id: string) {
    const res = await ideaApi.promote(id)
    await loadIdeas() // 后端已回写 status=promoted/promoted_to，刷新列表
    return res
  }

  // ── 工作流 ──
  async function runWorkflow(name: string, dag: unknown, config?: Record<string, unknown>) {
    return await workflowApi.run(name, dag, config)
  }

  async function loadWorkflowExecutions() {
    try {
      state.workflowExecutions = await workflowApi.listExecutions()
    } catch (e: any) {
      state.error = e?.toString() ?? '加载工作流记录失败'
    }
  }

  async function startEventListener() {
    if (_eventUnlisten) return _eventUnlisten
    _eventUnlisten = await workflowApi.onEvent((payload) => {
      try {
        state.liveEvents.push(payload)
        // 处理人工审批请求
        if (payload.event?.type === 'HumanApprovalRequest') {
          state.pendingApproval = payload.event.data as typeof state.pendingApproval
        }
      } catch (e) {
        console.error('处理工作流事件失败:', e, payload)
      }
    })
    return _eventUnlisten
  }

  function clearLiveEvents() {
    state.liveEvents = []
  }

  async function approveHumanApproval(decision: string, comment?: string) {
    if (!state.pendingApproval) return

    try {
      // 调用 IPC 命令发送审批响应
      await invoke('approve_human_approval', {
        execution_id: state.pendingApproval.execution_id,
        node_id: state.pendingApproval.node_id,
        decision,
        comment
      })

      // 清除待审批状态
      state.pendingApproval = null
    } catch (error) {
      console.error('审批失败:', error)
    }
  }

  /** 取消当前待审批节点（调 cancel_workflow_node IPC 置节点 Cancelled） */
  async function cancelHumanApproval() {
    if (!state.pendingApproval) return

    try {
      await invoke('cancel_workflow_node', {
        execution_id: state.pendingApproval.execution_id,
        node_id: state.pendingApproval.node_id,
      })
      // 清除待审批状态
      state.pendingApproval = null
    } catch (error) {
      console.error('取消审批失败:', error)
    }
  }

  function stopEventListener() {
    if (_eventUnlisten) {
      try {
        _eventUnlisten()
      } catch (e) {
        console.error('停止事件监听失败:', e)
      }
      _eventUnlisten = null
    }
  }

  // ── 统计 ──
  const stats = computed(() => ({
    ideas: state.ideas.length,
    projects: state.projects.length,
    activeTasks: state.tasks.filter(t => t.status === 'in_progress').length,
    drafts: state.ideas.filter(i => i.status === 'draft').length,
  }))

  return reactive({
    // 状态用 getter 实时读 state —— 直接 ideas: state.ideas 会快照引用，
    // loadIdeas 等重新赋值 state.ideas 时返回对象的 ideas 属性不跟随，刷新后视图为空
    get projects() { return state.projects },
    get tasks() { return state.tasks },
    get ideas() { return state.ideas },
    get workflowExecutions() { return state.workflowExecutions },
    get liveEvents() { return state.liveEvents },
    get loading() { return state.loading },
    get error() { return state.error },
    clearError,
    get deletedProjects() { return state.deletedProjects },
    // project actions
    loadProjects, createProject, updateProject, deleteProject, relocateProjectPath,
    loadDeletedProjects, restoreProject, purgeProject,
    // task actions
    loadTasks, createTask, updateTask, deleteTask,
    // idea actions
    loadIdeas, createIdea, updateIdea, deleteIdea, evaluateIdea, promoteIdea,
    // workflow actions
    runWorkflow, loadWorkflowExecutions, startEventListener, stopEventListener, clearLiveEvents,
    approveHumanApproval, cancelHumanApproval, pendingApproval: computed(() => state.pendingApproval),
    // computed
    stats,
  })
}

type ProjectStore = ReturnType<typeof createStore>
let _storeInstance: ProjectStore | null = null

/** 项目/任务/灵感/工作流 全局状态(单例,多组件复用同一 reactive 包装) */
export function useProjectStore(): ProjectStore {
  if (_storeInstance) return _storeInstance
  _storeInstance = createStore()
  return _storeInstance
}