import React, { useState, useEffect } from 'react';
import { useParams, useNavigate } from 'react-router-dom';
import {
  Box,
  Typography,
  LinearProgress,
  Alert,
  Dialog,
  DialogTitle,
  DialogContent,
  DialogActions,
  Button,
  TextField,
  Breadcrumbs,
  Link,
  Stack,
} from '@mui/material';
import { type GridRowSelectionModel } from '@mui/x-data-grid';
import knowledgeService from '@/services/knowledge_service';
import type { IKnowledge, IKnowledgeFile } from '@/interfaces/database/knowledge';
import FileUploadDialog from '@/components/FileUploadDialog';
import KnowledgeInfoCard from './components/KnowledgeInfoCard';
import FileListComponent from './components/FileListComponent';
import FloatingActionButtons from './components/FloatingActionButtons';
import KnowledgeBreadcrumbs from './components/KnowledgeBreadcrumbs';
import { useDocumentList, useDocumentOperations } from '@/hooks/document-hooks';

function KnowledgeBaseDetail() {
  const { id } = useParams<{ id: string }>();
  const navigate = useNavigate();
  
  // 状态管理
  const [knowledgeBase, setKnowledgeBase] = useState<IKnowledge | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [searchKeyword, setSearchKeyword] = useState('');
  const [rowSelectionModel, setRowSelectionModel] = useState<GridRowSelectionModel>({
    type: 'include',
    ids: new Set()
  });
  const [uploadDialogOpen, setUploadDialogOpen] = useState(false);
  const [deleteDialogOpen, setDeleteDialogOpen] = useState(false);
  const [testingDialogOpen, setTestingDialogOpen] = useState(false);
  const [configDialogOpen, setConfigDialogOpen] = useState(false);

  // 使用新的document hooks
  const {
    documents: files,
    total,
    loading: filesLoading,
    error: filesError,
    currentPage,
    pageSize,
    refresh: refreshFiles,
    setKeywords,
    setCurrentPage,
    setPageSize,
  } = useDocumentList(id || '');

  const {
    uploadDocuments,
    deleteDocuments,
    runDocuments,
    loading: operationLoading,
    error: operationError,
  } = useDocumentOperations();

  // 获取知识库详情
  const fetchKnowledgeDetail = async () => {
    if (!id) return;
    
    try {
      setLoading(true);
      const response = await knowledgeService.getKnowledgeDetail({ kb_id: id });
      
      if (response.data.code === 0) {
        setKnowledgeBase(response.data.data);
      } else {
        setError(response.data.message || '获取知识库详情失败');
      }
    } catch (err: any) {
      setError(err.response?.data?.message || err.message || '获取知识库详情失败');
    } finally {
      setLoading(false);
    }
  };

  // 删除文件
  const handleDeleteFiles = async () => {
    try {      
      await deleteDocuments(Array.from(rowSelectionModel.ids) as string[]);
      setDeleteDialogOpen(false);
      setRowSelectionModel({
        type: 'include',
        ids: new Set()
      });
      refreshFiles();
      fetchKnowledgeDetail();
    } catch (err: any) {
      setError(err.response?.data?.message || err.message || '删除文件失败');
    }
  };

  // 上传文件处理
  const handleUploadFiles = async (uploadFiles: File[]) => {
    console.log('上传文件:', uploadFiles);
    const kb_id = knowledgeBase?.id || '';
    try {
      await uploadDocuments(kb_id, uploadFiles);
      refreshFiles();
      fetchKnowledgeDetail();
    } catch (err: any) {
      throw new Error(err.response?.data?.message || err.message || '上传文件失败');
    }
  };

  // 重新解析文件
  const handleReparse = async (docIds: string[]) => {
    try {
      await runDocuments(docIds);
      refreshFiles(); // 刷新列表
    } catch (err: any) {
      setError(err.response?.data?.message || err.message || '重新解析失败');
    }
  };

  // 初始化数据
  useEffect(() => {
    fetchKnowledgeDetail();
  }, [id]);

  // 搜索文件
  useEffect(() => {
    const timer = setTimeout(() => {
      setKeywords(searchKeyword);
    }, 500);

    return () => clearTimeout(timer);
  }, [searchKeyword, setKeywords]);

  // 合并错误状态
  const combinedError = error || filesError || operationError;

  if (loading) {
    return (
      <Box sx={{ p: 3 }}>
        <LinearProgress />
        <Typography sx={{ mt: 2 }}>加载中...</Typography>
      </Box>
    );
  }

  if (combinedError) {
    return (
      <Box sx={{ p: 3 }}>
        <Alert severity="error">{combinedError}</Alert>
      </Box>
    );
  }

  if (!knowledgeBase) {
    return (
      <Box sx={{ p: 3 }}>
        <Alert severity="warning">知识库不存在</Alert>
      </Box>
    );
  }

  return (
    <Box sx={{ p: 3 }}>
      {/* 面包屑导航 */}
      <KnowledgeBreadcrumbs knowledge={knowledgeBase} />

      {/* 知识库信息卡片 */}
      <KnowledgeInfoCard knowledgeBase={knowledgeBase} />

      {/* 文件列表组件 */}
      <FileListComponent
        files={files}
        loading={filesLoading}
        searchKeyword={searchKeyword}
        onSearchChange={setSearchKeyword}
        onReparse={(fileIds) => handleReparse(fileIds)}
        onDelete={(fileIds) => {
          console.log('删除文件:', fileIds);
          
          setRowSelectionModel({
            type: 'include',
            ids: new Set(fileIds)
          });
          setDeleteDialogOpen(true);
        }}
        onUpload={() => setUploadDialogOpen(true)}
        onRefresh={() => {
          refreshFiles();
          fetchKnowledgeDetail();
        }}
        rowSelectionModel={rowSelectionModel}
        onRowSelectionModelChange={(newModel) => {
          console.log('新的选择模型:', newModel);
          setRowSelectionModel(newModel);
        }}
        total={total}
        page={currentPage}
        pageSize={pageSize}
        onPageChange={setCurrentPage}
        onPageSizeChange={setPageSize}
      />

      {/* 浮动操作按钮 */}
      <FloatingActionButtons
        onTestClick={() => navigate(`/knowledge/${id}/testing`)}
        onConfigClick={() => navigate(`/knowledge/${id}/setting`)}
      />

      {/* 上传文件对话框 */}
      <FileUploadDialog
        open={uploadDialogOpen}
        onClose={() => setUploadDialogOpen(false)}
        onUpload={handleUploadFiles}
        title="上传文件到知识库"
        acceptedFileTypes={['.pdf', '.docx', '.txt', '.md', '.png', '.jpg', '.jpeg', '.mp4', '.wav']}
        maxFileSize={100}
        maxFiles={10}
      />

      {/* 删除确认对话框 */}
      <Dialog open={deleteDialogOpen} onClose={() => setDeleteDialogOpen(false)}>
        <DialogTitle>确认删除</DialogTitle>
        <DialogContent>
          <Typography>
            确定要删除选中的 {rowSelectionModel.ids.size} 个文件吗？此操作不可撤销。
          </Typography>
        </DialogContent>
        <DialogActions>
          <Button onClick={() => setDeleteDialogOpen(false)}>取消</Button>
          <Button color="error" onClick={handleDeleteFiles}>删除</Button>
        </DialogActions>
      </Dialog>

      {/* 检索测试对话框 */}
      <Dialog open={testingDialogOpen} onClose={() => setTestingDialogOpen(false)} maxWidth="md" fullWidth>
        <DialogTitle>检索测试</DialogTitle>
        <DialogContent>
          <Stack spacing={3} sx={{ mt: 1 }}>
            <TextField
              fullWidth
              label="测试查询"
              placeholder="输入要测试的查询内容..."
              multiline
              rows={3}
            />
            <Stack direction="row" spacing={2}>
              <TextField
                label="返回结果数量"
                type="number"
                defaultValue={5}
                sx={{ width: 150 }}
              />
              <TextField
                label="相似度阈值"
                type="number"
                defaultValue={0.7}
                inputProps={{ min: 0, max: 1, step: 0.1 }}
                sx={{ width: 150 }}
              />
            </Stack>
            <Box sx={{ minHeight: 200, border: '1px solid #e0e0e0', borderRadius: 1, p: 2 }}>
              <Typography variant="body2" color="text.secondary">
                测试结果将在这里显示...
              </Typography>
            </Box>
          </Stack>
        </DialogContent>
        <DialogActions>
          <Button onClick={() => setTestingDialogOpen(false)}>关闭</Button>
          <Button variant="contained">开始测试</Button>
        </DialogActions>
      </Dialog>

      {/* 配置设置对话框 */}
      <Dialog open={configDialogOpen} onClose={() => setConfigDialogOpen(false)} maxWidth="sm" fullWidth>
        <DialogTitle>配置设置</DialogTitle>
        <DialogContent>
          <Stack spacing={3} sx={{ mt: 1 }}>
            <TextField
              fullWidth
              label="知识库名称"
              defaultValue={knowledgeBase?.name}
            />
            <TextField
              fullWidth
              label="描述"
              multiline
              rows={3}
              defaultValue={knowledgeBase?.description}
            />
            <TextField
              fullWidth
              label="语言"
              defaultValue={knowledgeBase?.language}
            />
            <TextField
              fullWidth
              label="嵌入模型"
              defaultValue={knowledgeBase?.embd_id}
              disabled
            />
            <TextField
              fullWidth
              label="解析器"
              defaultValue={knowledgeBase?.parser_id}
              disabled
            />
          </Stack>
        </DialogContent>
        <DialogActions>
          <Button onClick={() => setConfigDialogOpen(false)}>取消</Button>
          <Button variant="contained">保存</Button>
        </DialogActions>
      </Dialog>
    </Box>
  );
}

export default KnowledgeBaseDetail;