/**
 * 任务中心页面
 * 展示用户的所有任务（生成任务、素材导入等），支持状态筛选、类型筛选、分页、重试
 */
import { useState } from "react"
import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query"
import { Table, Tabs, Select, Tag, Button, message, Popconfirm, Tooltip } from "antd"
import {
  CheckCircleOutlined,
  ClockCircleOutlined,
  SyncOutlined,
  CloseCircleOutlined,
  ExclamationCircleOutlined,
  MinusCircleOutlined,
  RedoOutlined,
  InfoCircleOutlined,
} from "@ant-design/icons"
import type { ColumnsType } from "antd/es/table"
import {
  getTasks,
  retryTask,
  type TaskItem,
  type TaskStatus,
  type TaskListParams,
} from "@/api/tasks"
import "./tasks.css"

/* ──────────── 常量 ──────────── */

/** 状态 Tab 配置 */
const STATUS_TABS: { key: TaskStatus | "all"; label: string }[] = [
  { key: "all", label: "全部" },
  { key: "waiting", label: "等待中" },
  { key: "running", label: "进行中" },
  { key: "completed", label: "已完成" },
  { key: "failed", label: "失败" },
  { key: "cancelled", label: "已取消" },
]

/** 类型筛选选项 */
const TYPE_OPTIONS = [
  { value: "all", label: "全部类型" },
  { value: "generation", label: "生成任务" },
  { value: "ingest", label: "素材导入" },
]

/** 状态标签配置 */
const STATUS_CONFIG: Record<TaskStatus, { label: string; color: string; icon: React.ReactNode }> = {
  pending: {
    label: "等待中",
    color: "default",
    icon: <ClockCircleOutlined />,
  },
  waiting: {
    label: "排队中",
    color: "processing",
    icon: <SyncOutlined spin />,
  },
  running: {
    label: "进行中",
    color: "processing",
    icon: <SyncOutlined spin />,
  },
  completed: {
    label: "已完成",
    color: "success",
    icon: <CheckCircleOutlined />,
  },
  failed: {
    label: "失败",
    color: "error",
    icon: <CloseCircleOutlined />,
  },
  cancelled: {
    label: "已取消",
    color: "default",
    icon: <MinusCircleOutlined />,
  },
}

/** 任务类型标签 */
const TYPE_LABELS: Record<string, { label: string; color: string }> = {
  generation: { label: "生成任务", color: "blue" },
  ingest: { label: "素材导入", color: "green" },
}

/* ──────────── 工具函数 ──────────── */

/** 格式化耗时 */
const formatDuration = (seconds?: number): string => {
  if (!seconds) return "-"
  if (seconds < 60) return `${Math.round(seconds)}秒`
  const minutes = Math.floor(seconds / 60)
  const secs = Math.round(seconds % 60)
  if (minutes < 60) return `${minutes}分${secs}秒`
  const hours = Math.floor(minutes / 60)
  const mins = minutes % 60
  return `${hours}小时${mins}分`
}

/** 格式化时间 */
const formatTime = (dateStr?: string | null): string => {
  if (!dateStr) return "-"
  const date = new Date(dateStr)
  return date.toLocaleString("zh-CN", {
    month: "2-digit",
    day: "2-digit",
    hour: "2-digit",
    minute: "2-digit",
  })
}

/* ──────────── 主组件 ──────────── */

export default function TaskCenter() {
  const queryClient = useQueryClient()

  // 筛选状态
  const [statusFilter, setStatusFilter] = useState<TaskStatus | "all">("all")
  const [typeFilter, setTypeFilter] = useState<string>("all")
  const [page, setPage] = useState(1)
  const [pageSize, setPageSize] = useState(20)
  const [expandedTaskId, setExpandedTaskId] = useState<string | null>(null)
  const [expandedTaskDetail, setExpandedTaskDetail] = useState<TaskItem | null>(null)

  // 查询参数
  const queryParams: TaskListParams = {
    page,
    page_size: pageSize,
    ...(statusFilter !== "all" && { status: statusFilter }),
    ...(typeFilter !== "all" && { task_type: typeFilter }),
  }

  // 获取任务列表
  const { data, isLoading, error } = useQuery({
    queryKey: ["tasks", queryParams],
    queryFn: () => getTasks(queryParams),
    refetchInterval: (query) => {
      // 有进行中的任务时自动刷新
      const tasks = query.state.data?.items ?? []
      const hasRunning = tasks.some((t) => t.status === "running" || t.status === "waiting")
      return hasRunning ? 5000 : false
    },
  })

  // 重试任务
  const retryMutation = useMutation({
    mutationFn: retryTask,
    onSuccess: () => {
      message.success("任务已重新提交")
      queryClient.invalidateQueries({ queryKey: ["tasks"] })
    },
    onError: () => {
      message.error("重试失败，请检查任务状态")
    },
  })

  // 展开查看详情
  const handleExpand = async (expanded: boolean, record: TaskItem) => {
    if (!expanded) {
      setExpandedTaskId(null)
      setExpandedTaskDetail(null)
      return
    }
    setExpandedTaskId(record.id)
    // 如果是失败任务，获取详情（含 error_info）
    if (record.status === "failed" && record.error_info) {
      setExpandedTaskDetail(record)
    }
  }

  // 表格列定义
  const columns: ColumnsType<TaskItem> = [
    {
      title: "任务ID",
      dataIndex: "id",
      key: "id",
      width: 120,
      ellipsis: true,
      render: (id: string) => (
        <Tooltip title={id}>
          <span className="task-id">{id.slice(0, 8)}...</span>
        </Tooltip>
      ),
    },
    {
      title: "类型",
      dataIndex: "task_type",
      key: "task_type",
      width: 100,
      render: (type: string) => {
        const config = TYPE_LABELS[type] || { label: type, color: "default" }
        return <Tag color={config.color}>{config.label}</Tag>
      },
    },
    {
      title: "状态",
      dataIndex: "status",
      key: "status",
      width: 120,
      render: (status: TaskStatus, record: TaskItem) => {
        const config = STATUS_CONFIG[status] || {
          label: status,
          color: "default",
          icon: null,
        }
        return (
          <Tag color={config.color} icon={config.icon} className="task-status-tag">
            {config.label}
            {status === "running" && record.progress > 0 && (
              <span className="task-progress"> {record.progress}%</span>
            )}
          </Tag>
        )
      },
    },
    {
      title: "当前步骤",
      dataIndex: "current_step",
      key: "current_step",
      width: 150,
      ellipsis: true,
      render: (step: string) => <span className="task-step">{step || "-"}</span>,
    },
    {
      title: "耗时",
      dataIndex: "duration_seconds",
      key: "duration_seconds",
      width: 100,
      render: (seconds: number) => <span className="task-duration">{formatDuration(seconds)}</span>,
    },
    {
      title: "创建时间",
      dataIndex: "created_at",
      key: "created_at",
      width: 120,
      render: (time: string) => <span className="task-time">{formatTime(time)}</span>,
    },
    {
      title: "操作",
      key: "action",
      width: 100,
      fixed: "right",
      render: (_: unknown, record: TaskItem) => {
        if (record.status === "failed" && record.retryable) {
          return (
            <Popconfirm
              title="确认重试"
              description="确定要重试这个失败的任务吗？"
              onConfirm={() => retryMutation.mutate(record.id)}
              okText="确定"
              cancelText="取消"
            >
              <Button
                type="link"
                size="small"
                icon={<RedoOutlined />}
                loading={retryMutation.isPending}
                className="task-retry-btn"
              >
                重试
              </Button>
            </Popconfirm>
          )
        }
        if (record.status === "failed") {
          return (
            <Button
              type="link"
              size="small"
              icon={<InfoCircleOutlined />}
              onClick={() => {
                setExpandedTaskId(record.id)
                setExpandedTaskDetail(record)
              }}
            >
              详情
            </Button>
          )
        }
        return <span className="task-action-placeholder">-</span>
      },
    },
  ]

  // 展开行渲染（错误详情）
  const expandedRowRender = (record: TaskItem) => {
    const detail = expandedTaskDetail || record
    const errorInfo = detail.error_info

    if (!errorInfo && !detail.error_message) {
      return <div className="task-expand-empty">暂无错误详情</div>
    }

    return (
      <div className="task-error-detail">
        <div className="task-error-header">
          <ExclamationCircleOutlined className="task-error-icon" />
          <span>错误详情</span>
        </div>
        <div className="task-error-body">
          {errorInfo?.error_type && (
            <div className="task-error-row">
              <span className="task-error-label">错误类型：</span>
              <Tag color="error">{errorInfo.error_type}</Tag>
            </div>
          )}
          {(errorInfo?.error_message || detail.error_message) && (
            <div className="task-error-row">
              <span className="task-error-label">错误信息：</span>
              <span className="task-error-message">
                {errorInfo?.error_message || detail.error_message}
              </span>
            </div>
          )}
          {errorInfo?.failed_step && (
            <div className="task-error-row">
              <span className="task-error-label">失败阶段：</span>
              <span>{errorInfo.failed_step}</span>
            </div>
          )}
          {errorInfo?.stack_trace && (
            <div className="task-error-row task-error-stack">
              <span className="task-error-label">堆栈信息：</span>
              <pre>{errorInfo.stack_trace}</pre>
            </div>
          )}
        </div>
      </div>
    )
  }

  // 错误处理
  if (error) {
    return (
      <div className="task-center">
        <div className="task-error">
          <CloseCircleOutlined />
          <p>加载任务列表失败</p>
          <Button onClick={() => window.location.reload()}>刷新页面</Button>
        </div>
      </div>
    )
  }

  return (
    <div className="task-center">
      {/* 页面标题 */}
      <div className="task-header">
        <h1 className="task-title">任务中心</h1>
        <p className="task-subtitle">查看和管理所有生成任务与素材导入任务</p>
      </div>

      {/* 筛选栏 */}
      <div className="task-filters">
        {/* 状态 Tab */}
        <Tabs
          activeKey={statusFilter}
          onChange={(key) => {
            setStatusFilter(key as TaskStatus | "all")
            setPage(1)
          }}
          items={STATUS_TABS.map((tab) => ({
            key: tab.key,
            label: tab.label,
          }))}
          className="task-status-tabs"
        />

        {/* 类型筛选 */}
        <div className="task-type-filter">
          <Select
            value={typeFilter}
            onChange={(value) => {
              setTypeFilter(value)
              setPage(1)
            }}
            options={TYPE_OPTIONS}
            style={{ width: 140 }}
            placeholder="选择类型"
          />
        </div>
      </div>

      {/* 任务表格 */}
      <Table
        columns={columns}
        dataSource={data?.items || []}
        rowKey="id"
        loading={isLoading}
        pagination={{
          current: page,
          pageSize,
          total: data?.total || 0,
          showSizeChanger: true,
          showQuickJumper: true,
          showTotal: (total) => `共 ${total} 条`,
          onChange: (p, ps) => {
            setPage(p)
            setPageSize(ps)
          },
        }}
        expandable={{
          expandedRowRender,
          expandedRowKeys: expandedTaskId ? [expandedTaskId] : [],
          onExpand: handleExpand,
          rowExpandable: (record) =>
            record.status === "failed" && (!!record.error_info || !!record.error_message),
        }}
        scroll={{ x: 800 }}
        className="task-table"
        locale={{
          emptyText: (
            <div className="task-empty">
              <ClockCircleOutlined />
              <p>暂无任务记录</p>
            </div>
          ),
        }}
      />
    </div>
  )
}