import React, { useState, useEffect } from 'react';
import { useParams, useNavigate } from 'react-router-dom';
import { useForm, type UseFormReturn } from 'react-hook-form';
import {
  Box,
  Container,
  Typography,
  Paper,
  Tabs,
  Tab,
  Fab,
  Snackbar,
  Alert,
} from '@mui/material';
import {
  ArrowBack as ArrowBackIcon,
} from '@mui/icons-material';
import { useKnowledgeDetail, useKnowledgeOperations } from '@/hooks/knowledge-hooks';
import GeneralForm, { type BasicFormData } from './components/GeneralForm';
import ChunkMethodForm, { type ConfigFormData } from './components/ChunkMethodForm';
import KnowledgeBreadcrumbs from './components/KnowledgeBreadcrumbs';
import { useSnackbar } from '@/components/Provider/SnackbarProvider';

interface TabPanelProps {
  children?: React.ReactNode;
  index: number;
  value: number;
}

function TabPanel(props: TabPanelProps) {
  const { children, value, index, ...other } = props;

  return (
    <div
      role="tabpanel"
      hidden={value !== index}
      id={`setting-tabpanel-${index}`}
      aria-labelledby={`setting-tab-${index}`}
      {...other}
    >
      {value === index && (
        <Box sx={{ p: 3 }}>
          {children}
        </Box>
      )}
    </div>
  );
}

function a11yProps(index: number) {
  return {
    id: `setting-tab-${index}`,
    'aria-controls': `setting-tabpanel-${index}`,
  };
}

function KnowledgeBaseSetting() {
  const { id } = useParams<{ id: string }>();
  const navigate = useNavigate();
  const [tabValue, setTabValue] = useState(0);

  // 获取知识库详情
  const { knowledge, loading: detailLoading, refresh } = useKnowledgeDetail(id || '');
  const { showMessage } = useSnackbar();
  
  // 知识库操作hooks
  const { 
    updateKnowledgeBasicInfo, 
    updateKnowledgeModelConfig, 
    loading: operationLoading 
  } = useKnowledgeOperations();

  // 基础信息表单
  const basicForm = useForm<BasicFormData>({
    defaultValues: {
      name: '',
      description: '',
      permission: 'me',
      avatar: undefined,
    },
  });

  // 解析配置表单
  const configForm = useForm<ConfigFormData>({
    defaultValues: {
      parser_id: 'naive',
      chunk_token_count: 512,
      layout_recognize: false,
      task_page_size: 0,
    },
  });

  // 当知识库数据加载完成时，更新表单默认值
  useEffect(() => {
    if (knowledge) {
      basicForm.reset({
        name: knowledge.name || '',
        description: knowledge.description || '',
        permission: knowledge.permission || 'me',
        avatar: knowledge.avatar,
      });

      configForm.reset({
        // parser_id: knowledge.parser_id || 'naive',
        // chunk_token_count: knowledge.chunk_token_count || 512,
        // layout_recognize: knowledge.layout_recognize || false,
        // task_page_size: knowledge.task_page_size || 0,
      });
    }
  }, [knowledge, basicForm, configForm]);

  const handleTabChange = (event: React.SyntheticEvent, newValue: number) => {
    setTabValue(newValue);
  };

  const handleBasicInfoSubmit = async (data: BasicFormData) => {
    if (!knowledge) return;

    try {
      const kb = {
        ...data,
        // parser_id: knowledge.parser_id,  
        kb_id: knowledge.id,
      } as any;

      await updateKnowledgeBasicInfo(kb);
      showMessage.success('基础信息更新成功');
      // 刷新知识库详情
      refresh();
    } catch (error) {
      // showMessage.error('基础信息更新失败');
    }
  };

  const handleConfigSubmit = async (data: ConfigFormData) => {
    if (!id) return;

    try {
      await updateKnowledgeModelConfig({
        id,
        parser_id: data.parser_id,
        // 可以根据需要添加更多配置字段
      });
      showMessage.success('解析配置更新成功');
      // 刷新知识库详情
      refresh();
    } catch (error) {
      // showMessage.error('解析配置更新失败');
    }
  };

  const handleBackToDetail = () => {
    navigate(`/knowledge/${id}`);
  };

  if (detailLoading) {
    return (
      <Container maxWidth="lg" sx={{ py: 4 }}>
        <Typography>加载中...</Typography>
      </Container>
    );
  }

  return (
    <Container maxWidth="lg" sx={{ py: 4 }}>
      {/* 面包屑导航 */}
      <KnowledgeBreadcrumbs knowledge={knowledge} />
      
      <Box sx={{ mb: 3 }}>
        <Typography variant="h4" gutterBottom>
          知识库设置
        </Typography>
        <Typography variant="subtitle1" color="text.secondary">
          {knowledge?.name}
        </Typography>
      </Box>

      <Paper sx={{ width: '100%' }}>
        <Box sx={{ borderBottom: 1, borderColor: 'divider' }}>
          <Tabs value={tabValue} onChange={handleTabChange} aria-label="设置选项卡">
            <Tab label="基础信息" {...a11yProps(0)} />
            <Tab label="解析配置" {...a11yProps(1)} />
          </Tabs>
        </Box>

        <TabPanel value={tabValue} index={0}>
          <GeneralForm
            form={basicForm}
            onSubmit={handleBasicInfoSubmit}
            isSubmitting={operationLoading}
            submitButtonText="保存基础信息"
            disabled={detailLoading}
          />
        </TabPanel>

        <TabPanel value={tabValue} index={1}>
          <ChunkMethodForm
            form={configForm as any}
            onSubmit={handleConfigSubmit}
            isSubmitting={operationLoading}
            submitButtonText="保存解析配置"
            disabled={detailLoading}
          />
        </TabPanel>
      </Paper>

      {/* 返回按钮 */}
      <Fab
        color="primary"
        aria-label="返回知识库详情"
        onClick={handleBackToDetail}
        sx={{
          position: 'fixed',
          bottom: 128,
          right: 64,
        }}
      >
        <ArrowBackIcon />
      </Fab>
    </Container>
  );
}

export default KnowledgeBaseSetting;