import { useEffect, useMemo, useRef, useState } from "react";
import { Breadcrumb, App, Tabs, Table, Tag } from "antd";
import {
  ReloadOutlined,
  DownloadOutlined,
  EditOutlined,
  DeleteOutlined,
  PlusOutlined,
} from "@ant-design/icons";
import DetailHeader from "@/components/DetailHeader";
import { mapDataset, datasetTypeMap } from "../dataset.const";
import type { Dataset } from "@/pages/DataManagement/dataset.model";
import { Link, useNavigate, useParams } from "react-router";
import { useFilesOperation } from "./useFilesOperation";
import {
  createDatasetTagUsingPost,
  deleteDatasetByIdUsingDelete,
  downloadDatasetUsingGet,
  queryDatasetByIdUsingGet,
  queryDatasetsUsingGet,
  queryDatasetTagsUsingGet,
  querySimilarDatasetsUsingGet,
  updateDatasetByIdUsingPut,
} from "../dataset.api";
import DataQuality from "./components/DataQuality";
import DataLineageFlow from "./components/DataLineageFlow";
import Overview from "./components/Overview";
import { Activity, Clock, File, FileType } from "lucide-react";
import EditDataset from "../Create/EditDataset";
import ImportConfiguration from "./components/ImportConfiguration";

const SIMILAR_DATASET_LIMIT = 4;

export default function DatasetDetail() {
  const { id } = useParams(); // 获取动态路由参数
  const navigate = useNavigate();
  const [activeTab, setActiveTab] = useState("overview");
  const { message } = App.useApp();
  const [showEditDialog, setShowEditDialog] = useState(false);

  const [dataset, setDataset] = useState<Dataset>({} as Dataset);
  const [parentDataset, setParentDataset] = useState<Dataset | null>(null);
  const [childDatasets, setChildDatasets] = useState<Dataset[]>([]);
  const [childDatasetsLoading, setChildDatasetsLoading] = useState(false);
  const [similarDatasets, setSimilarDatasets] = useState<Dataset[]>([]);
  const [similarDatasetsLoading, setSimilarDatasetsLoading] = useState(false);
  const [similarTagNames, setSimilarTagNames] = useState<string[]>([]);
  const similarRequestRef = useRef(0);
  const filesOperation = useFilesOperation(dataset);

  const [showUploadDialog, setShowUploadDialog] = useState(false);
  const normalizeTagNames = (
    tags?: Array<string | { name?: string | null } | null>
  ) => {
    if (!tags || tags.length === 0) {
      return [];
    }
    const names = tags
      .map((tag) => (typeof tag === "string" ? tag : tag?.name))
      .filter((name): name is string => !!name && name.trim().length > 0)
      .map((name) => name.trim());
    return Array.from(new Set(names));
  };
  const fetchSimilarDatasets = async (currentDataset: Dataset) => {
    const requestId = similarRequestRef.current + 1;
    similarRequestRef.current = requestId;
    if (!currentDataset?.id) {
      setSimilarDatasets([]);
      setSimilarTagNames([]);
      setSimilarDatasetsLoading(false);
      return;
    }
    const tagNames = normalizeTagNames(
      currentDataset.tags as Array<string | { name?: string }>
    );
    setSimilarTagNames(tagNames);
    setSimilarDatasets([]);
    if (tagNames.length === 0) {
      setSimilarDatasetsLoading(false);
      return;
    }
    setSimilarDatasetsLoading(true);
    try {
      const { data } = await querySimilarDatasetsUsingGet(currentDataset.id, {
        limit: SIMILAR_DATASET_LIMIT,
      });
      if (similarRequestRef.current !== requestId) {
        return;
      }
      const list = Array.isArray(data) ? data : [];
      setSimilarDatasets(list.map((item) => mapDataset(item)));
    } catch (error) {
      console.error("Failed to fetch similar datasets:", error);
    } finally {
      if (similarRequestRef.current === requestId) {
        setSimilarDatasetsLoading(false);
      }
    }
  };
  const navigateItems = useMemo(() => {
    const items = [
      {
        title: <Link to="/data/management">数据管理</Link>,
      },
    ];
    if (parentDataset) {
      items.push({
        title: (
          <Link to={`/data/management/detail/${parentDataset.id}`}>
            {parentDataset.name}
          </Link>
        ),
      });
    }
    items.push({
      title: dataset.name || "数据集详情",
    });
    return items;
  }, [dataset, parentDataset]);
  const tabList = useMemo(() => {
    const items = [
      {
        key: "overview",
        label: "概览",
      },
    ];
    if (!dataset?.parentDatasetId) {
      items.push({
        key: "children",
        label: "子数据集",
      });
    }
    return items;
  }, [dataset?.parentDatasetId]);
  const handleCreateChildDataset = () => {
    if (!dataset?.id) {
      return;
    }
    navigate("/data/management/create", {
      state: { parentDatasetId: dataset.id },
    });
  };
  const fetchChildDatasets = async (parentId?: string) => {
    if (!parentId) {
      setChildDatasets([]);
      return;
    }
    setChildDatasetsLoading(true);
    try {
      const { data: res } = await queryDatasetsUsingGet({
        parentDatasetId: parentId,
        page: 1,
        size: 1000,
      });
      const list = res?.content || res?.data || [];
      setChildDatasets(list.map((item) => mapDataset(item)));
    } finally {
      setChildDatasetsLoading(false);
    }
  };
  const fetchDataset = async () => {
    if (!id) {
      return;
    }
    const { data } = await queryDatasetByIdUsingGet(id);
    const mapped = mapDataset(data);
    setDataset(mapped);
    fetchSimilarDatasets(mapped);
    if (data?.parentDatasetId) {
      const { data: parentData } = await queryDatasetByIdUsingGet(
        data.parentDatasetId
      );
      setParentDataset(mapDataset(parentData));
      setChildDatasets([]);
    } else {
      setParentDataset(null);
      await fetchChildDatasets(data?.id);
    }
  };

  useEffect(() => {
    if (!id) {
      return;
    }
    fetchDataset();
    filesOperation.fetchFiles("", 1, 10); // 从根目录开始，第一页
  }, [id]);
  useEffect(() => {
    if (dataset?.parentDatasetId && activeTab === "children") {
      setActiveTab("overview");
    }
  }, [activeTab, dataset?.parentDatasetId]);

  const handleRefresh = async (showMessage = true, prefixOverride?: string) => {
    fetchDataset();
    // 刷新当前目录，保持在当前页
    const targetPrefix =
      prefixOverride !== undefined
        ? prefixOverride
        : filesOperation.pagination.prefix;
    filesOperation.fetchFiles(
      targetPrefix,
      filesOperation.pagination.current,
      filesOperation.pagination.pageSize
    );
    if (showMessage) message.success({ content: "数据刷新成功" });
  };

  const handleDownload = async () => {
    await downloadDatasetUsingGet(dataset.id);
    message.success("文件下载成功");
  };

  const handleDeleteDataset = async () => {
    await deleteDatasetByIdUsingDelete(dataset.id);
    navigate("/data/management");
    message.success("数据集删除成功");
  };

  useEffect(() => {
    const refreshData = (e: Event) => {
      const custom = e as CustomEvent<{ prefix?: string }>;
      const prefixOverride = custom.detail?.prefix;
      handleRefresh(false, prefixOverride);
    };
    window.addEventListener("update:dataset", refreshData as EventListener);
    return () => {
      window.removeEventListener(
        "update:dataset",
        refreshData as EventListener
      );
    };
  }, []);

  // 基本信息描述项
  const statistics = [
    {
      icon: <File className="text-blue-400 w-4 h-4" />,
      key: "file",
      value: dataset?.fileCount || 0,
    },
    {
      icon: <Activity className="text-blue-400 w-4 h-4" />,
      key: "size",
      value: dataset?.size || "0 B",
    },
    {
      icon: <FileType className="text-blue-400 w-4 h-4" />,
      key: "type",
      value:
        datasetTypeMap[dataset?.datasetType as keyof typeof datasetTypeMap]
          ?.label ||
        dataset?.type ||
        "未知",
    },
    {
      icon: <Clock className="text-blue-400 w-4 h-4" />,
      key: "time",
      value: dataset?.updatedAt,
    },
  ];

  // 数据集操作列表
  const operations = [
    ...(dataset?.id && !dataset.parentDatasetId
      ? [
          {
            key: "create-child",
            label: "创建子数据集",
            icon: <PlusOutlined />,
            onClick: handleCreateChildDataset,
          },
        ]
      : []),
    {
      key: "edit",
      label: "编辑",
      icon: <EditOutlined />,
      onClick: () => {
        setShowEditDialog(true);
      },
    },

    {
      key: "export",
      label: "导出",
      icon: <DownloadOutlined />,
      // isDropdown: true,
      // items: [
      //   { key: "alpaca", label: "Alpaca 格式", icon: <FileTextOutlined /> },
      //   { key: "jsonl", label: "JSONL 格式", icon: <DatabaseOutlined /> },
      //   { key: "csv", label: "CSV 格式", icon: <FileTextOutlined /> },
      //   { key: "coco", label: "COCO 格式", icon: <FileImageOutlined /> },
      // ],
      onClick: () => handleDownload(),
    },
    {
      key: "refresh",
      label: "刷新",
      icon: <ReloadOutlined />,
      onClick: handleRefresh,
    },
    {
      key: "delete",
      label: "删除",
      danger: true,
      confirm: {
        title: "确认删除该数据集？",
        description: "删除后该数据集将无法恢复，请谨慎操作。",
        okText: "删除",
        cancelText: "取消",
        okType: "danger",
      },
      icon: <DeleteOutlined />,
      onClick: handleDeleteDataset,
    },
  ];
  const childColumns = [
    {
      title: "名称",
      dataIndex: "name",
      key: "name",
      render: (_: string, record: Dataset) => (
        <Link to={`/data/management/detail/${record.id}`}>{record.name}</Link>
      ),
    },
    {
      title: "类型",
      dataIndex: "datasetType",
      key: "datasetType",
      width: 120,
      render: (value: string) => datasetTypeMap[value]?.label || "未知",
    },
    {
      title: "状态",
      dataIndex: "status",
      key: "status",
      width: 120,
      render: (status) =>
        status ? <Tag color={status.color}>{status.label}</Tag> : "-",
    },
    {
      title: "文件数",
      dataIndex: "fileCount",
      key: "fileCount",
      width: 120,
      render: (value?: number) => value ?? 0,
    },
    {
      title: "大小",
      dataIndex: "size",
      key: "size",
      width: 140,
      render: (value?: string) => value || "0 B",
    },
    {
      title: "更新时间",
      dataIndex: "updatedAt",
      key: "updatedAt",
      width: 180,
    },
  ];

  return (
    <div className="h-full flex flex-col gap-4">
      <Breadcrumb items={navigateItems} />
      {/* Header */}
      <DetailHeader
        data={dataset}
        statistics={statistics}
        operations={operations}
        tagConfig={{
          showAdd: true,
          tags: dataset.tags || [],
          onFetchTags: async () => {
            const res = await queryDatasetTagsUsingGet({
              page: 0,
              pageSize: 1000,
            });
            return res.data || [];
          },
          onCreateAndTag: async (tagName) => {
            const res = await createDatasetTagUsingPost({ name: tagName });
            if (res.data) {
              await updateDatasetByIdUsingPut(dataset.id, {
                tags: [...dataset.tags.map((tag) => tag.name), res.data.name],
              });
              handleRefresh();
            }
          },
          onAddTag: async (tag) => {
            const res = await updateDatasetByIdUsingPut(dataset.id, {
              tags: [...dataset.tags.map((tag) => tag.name), tag],
            });
            if (res.data) {
              handleRefresh();
            }
          },
        }}
      />
      <div className="flex-overflow-auto p-6 pt-2 bg-white rounded-md shadow">
        <Tabs activeKey={activeTab} items={tabList} onChange={setActiveTab} />
        <div className="h-full overflow-auto">
          {activeTab === "overview" && (
            <Overview
              dataset={dataset}
              filesOperation={filesOperation}
              fetchDataset={fetchDataset}
              onUpload={() => setShowUploadDialog(true)}
              similarDatasets={similarDatasets}
              similarDatasetsLoading={similarDatasetsLoading}
              similarTags={similarTagNames}
            />
          )}
          {activeTab === "children" && (
            <div className="pt-4">
              <div className="flex items-center justify-between mb-3">
                <h2 className="text-base font-semibold">子数据集</h2>
                <span className="text-xs text-gray-500">
                  共 {childDatasets.length} 个
                </span>
              </div>
              <Table
                rowKey="id"
                columns={childColumns}
                dataSource={childDatasets}
                loading={childDatasetsLoading}
                pagination={false}
                locale={{ emptyText: "暂无子数据集" }}
              />
            </div>
          )}
          {activeTab === "lineage" && <DataLineageFlow dataset={dataset} />}
          {activeTab === "quality" && <DataQuality />}
        </div>
      </div>
      <ImportConfiguration
        data={dataset}
        open={showUploadDialog}
        onClose={() => setShowUploadDialog(false)}
        prefix={filesOperation.pagination.prefix}
        updateEvent="update:dataset"
      />
      <EditDataset
        data={dataset}
        open={showEditDialog}
        onClose={() => setShowEditDialog(false)}
        onRefresh={handleRefresh}
      />
    </div>
  );
}
