import React, { useState, useEffect, useMemo } from 'react';
import { Button, Card, Radio, Tabs, Input, Form, Row, Col } from 'antd';
import { ViewMode } from './types';
import { defaultConfig } from './config';
import { useExcelParser } from './hooks/useExcelParser';
import { useSheetConfig } from './hooks/useSheetConfig';
import FileUpload from './components/FileUpload';
import SheetConfig from './components/SheetConfig/index';
import DataViewer from './components/DataViewer/index';
import './styles.css';
import type { Template } from '@/share/exceltypes';
import type { UseMutateFunction } from '@tanstack/react-query';

// 为组件定义 Props 接口
export interface ExcelToJsonProps {
  initialValue?: Template | null;
  onSave?: UseMutateFunction<any, Error, Partial<Template>, unknown>;
  /** 是否使用默认配置 */
  useDefaultConfig?: boolean;
}

const ExcelToJson: React.FC<ExcelToJsonProps> = ({ initialValue, onSave, useDefaultConfig = false }) => {
  const [viewMode, setViewMode] = useState<ViewMode>('table');
  const [templateName, setTemplateName] = useState<string>(initialValue?.templateName || '');
  const [templateKey, setTemplateKey] = useState<string>(initialValue?.templateKey || '');
  
  const { 
    jsonData, 
    allFieldsData, 
    parseExcelFile, 
    generateExportData, 
    getFieldsBySheet 
  } = useExcelParser();
  const { 
    config, 
    addNewSheet,
    removeSheet,
    updateSheetConfig,
    setActiveSheet
  } = useSheetConfig(
    initialValue?.templateConfig || (useDefaultConfig ? defaultConfig : { sheets: [], activeSheetIndex: 0 }),
    useDefaultConfig
  );

  // 使用 useMemo 缓存 getFieldsBySheet 的结果，只在 allFieldsData 变化时重新计算
  const fieldsBySheet = useMemo(() => {
    if (Object.keys(allFieldsData).length === 0) return {};
    return getFieldsBySheet(allFieldsData);
  }, [allFieldsData]);

  // 添加对 initialValue 的处理
  useEffect(() => {
    if (initialValue?.templateConfig) {
      // 如果有初始值，可以在这里处理
      console.log('加载已有模板配置', initialValue.templateConfig);
    }
  }, [initialValue]);

  // 当配置或原始数据变化时，重新生成导出数据
  useEffect(() => {
    // 只有当原始数据存在时才处理
    if (Object.keys(allFieldsData).length > 0) {
      generateExportData(config.sheets);
    }
  }, [fieldsBySheet, config.sheets]);
  
  // 处理字段初始化
  const initializeFields = (fieldsBySheet: { [key: string]: string[] }) => {
    const activeSheet = config.sheets[config.activeSheetIndex];
    if (!activeSheet) return;
    
    // 获取当前工作表的字段
    const sheetName = activeSheet.sheetName;
    const fields = fieldsBySheet[sheetName] || [];
    
    // 只有当exportFields为空或者长度很少时才自动添加全部字段
    if (activeSheet.exportFields.length === 0 || 
        (activeSheet.exportFields.length < 3 && fields.length > 0)) {
      
      // 创建新的字段映射，key和value保持一致
      const newFieldMappings = { ...activeSheet.fieldMappings };
      
      // 添加缺失的字段映射
      fields.forEach(field => {
        if (!newFieldMappings[field]) {
          newFieldMappings[field] = field;
        }
      });
      
      // 更新工作表配置
      updateSheetConfig(config.activeSheetIndex, {
        exportFields: fields,
        fieldMappings: newFieldMappings
      });
      
      console.log('自动更新字段配置', fields);
    }
  };

  const downloadJson = () => {
    if (!jsonData || Object.keys(jsonData).length === 0) return;
    const dataStr = JSON.stringify(jsonData, null, 2);
    const blob = new Blob([dataStr], { type: 'application/json' });
    const url = URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    a.download = '导出数据.json';
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
    URL.revokeObjectURL(url);
  };

  // 添加保存模板功能
  const saveTemplate = () => {
    if (!onSave) return;
    
    const templateData: Partial<Template> = {
      templateName: templateName || '新模板',
      templateKey: templateKey || `template_${Date.now()}`,
      templateConfig: config,
    };
    
    if (initialValue?.id) {
      templateData.id = initialValue.id;
    }
    
    onSave(templateData);
  };

  const handleFileChange = async (file: File) => {
    try {
      // 解析Excel文件，同时获取按工作表分组的可用字段
      const { rawData, availableFieldsBySheet } = await parseExcelFile(file, config.sheets);
      
      // 初始化字段配置
      if (rawData && Object.keys(rawData).length > 0) {
        initializeFields(availableFieldsBySheet);
      }
    } catch (error) {
      console.error('文件处理错误:', error);
    }
  };

  return (
    <div className="h-full flex flex-col">
      <div style={{ 
        display: 'flex', 
        gap: '8px', 
        marginBottom: '12px',
        alignItems: 'center'
      }}>
        {onSave && (
          <>
            <Form layout="inline" style={{ marginRight: 'auto' }}>
              <Form.Item label="模板名称" required style={{ marginBottom: 0 }}>
                <Input 
                  value={templateName} 
                  onChange={e => setTemplateName(e.target.value)} 
                  placeholder="请输入模板名称"
                  style={{ width: '150px' }}
                />
              </Form.Item>
              <Form.Item label="模板标识" required style={{ marginBottom: 0 }}>
                <Input 
                  value={templateKey} 
                  onChange={e => setTemplateKey(e.target.value)} 
                  placeholder="请输入模板标识"
                  style={{ width: '150px' }}
                />
              </Form.Item>
            </Form>
          </>
        )}
        <FileUpload onFileChange={handleFileChange} />
        {Object.keys(jsonData).length > 0 && (
          <>
            <Button type="primary" onClick={downloadJson}>
              下载 JSON
            </Button>
            <Radio.Group 
              value={viewMode} 
              onChange={e => setViewMode(e.target.value)}
              optionType="button"
              buttonStyle="solid"
            >
              <Radio.Button value="table">表格</Radio.Button>
              <Radio.Button value="json">JSON</Radio.Button>
            </Radio.Group>
          </>
        )}
        {onSave && (
          <Button type="primary" onClick={saveTemplate}>
            保存模板
          </Button>
        )}
      </div>

      <div style={{ 
        display: 'flex', 
        gap: '16px', 
        flex: 1,
        minHeight: 0
      }}>
        <div style={{ 
          width: '380px',
          display: 'flex',
          flexDirection: 'column',
          backgroundColor: '#fff',
          borderRadius: '2px'
        }}>
          <Tabs
            type="editable-card"
            activeKey={config.activeSheetIndex.toString()}
            onChange={(key) => setActiveSheet(parseInt(key))}
            onEdit={(targetKey, action) => {
              if (action === 'add') {
                addNewSheet();
              } else if (action === 'remove' && typeof targetKey === 'string') {
                removeSheet(parseInt(targetKey));
              }
            }}
            items={config.sheets.map((sheet, index) => ({
              key: index.toString(),
              label: sheet.sheetName,
              children: (
                <div style={{ overflow: 'auto', height: '100%', padding: '12px' }}>
                  <SheetConfig
                    config={sheet}
                    availableFields={fieldsBySheet[sheet.sheetName] || []}
                    onConfigChange={(updates) => updateSheetConfig(index, updates)}
                  />
                </div>
              )
            }))}
            style={{ display: 'flex', flexDirection: 'column', height: '100%' }}
            className="compact-tabs"
          />
        </div>

        <div style={{ 
          flex: 1,
          display: 'flex',
          flexDirection: 'column',
          backgroundColor: '#fff',
          borderRadius: '2px'
        }}>
          {Object.keys(jsonData).length > 0 && (
            <div style={{ 
              // overflow: 'auto', 
              height: '100%', 
              // padding: '12px' 
              }}>
              <DataViewer
                data={jsonData}
                viewMode={viewMode}
                config={config}
              />
            </div>
          )}
        </div>
      </div>
    </div>
  );
};

export default ExcelToJson;