"use client";

import React, { useEffect, useState, Component, ErrorInfo, ReactNode } from "react";
import { AutoRegisteringComponentRenderer } from "../../AutoRegisteringComponentRenderer";
import { createComponentDefinition } from "../../utils/createComponentDefinition";
import { ComponentCategory } from "@/types/component";
import { PivotGridComponent } from "./PivotGridComponent";
import { PivotGridConfigPanel } from "./PivotGridConfigPanel";
import { PivotFieldConfig } from "./types";
import { dataApi } from "@/lib/api/data";
import { AlertCircle, RefreshCw } from "lucide-react";
import { Button } from "@/components/ui/button";

// ==================== 에러 경계 ====================

interface ErrorBoundaryState {
  hasError: boolean;
  error?: Error;
}

class PivotGridErrorBoundary extends Component<
  { children: ReactNode; onReset?: () => void },
  ErrorBoundaryState
> {
  constructor(props: { children: ReactNode; onReset?: () => void }) {
    super(props);
    this.state = { hasError: false };
  }

  static getDerivedStateFromError(error: Error): ErrorBoundaryState {
    return { hasError: true, error };
  }

  componentDidCatch(error: Error, errorInfo: ErrorInfo) {
    console.error("🔴 [PivotGrid] 렌더링 에러:", error);
    console.error("🔴 [PivotGrid] 에러 정보:", errorInfo);
  }

  handleReset = () => {
    this.setState({ hasError: false, error: undefined });
    this.props.onReset?.();
  };

  render() {
    if (this.state.hasError) {
      return (
        <div className="flex flex-col items-center justify-center p-8 text-center border border-destructive/50 rounded-lg bg-destructive/5">
          <AlertCircle className="h-8 w-8 text-destructive mb-2" />
          <h3 className="text-sm font-medium text-destructive mb-1">
            피벗 그리드 오류
          </h3>
          <p className="text-xs text-muted-foreground mb-3 max-w-md">
            {this.state.error?.message || "알 수 없는 오류가 발생했습니다."}
          </p>
          <Button
            variant="outline"
            size="sm"
            onClick={this.handleReset}
            className="gap-2"
          >
            <RefreshCw className="h-3.5 w-3.5" />
            다시 시도
          </Button>
        </div>
      );
    }

    return this.props.children;
  }
}

// ==================== 샘플 데이터 (미리보기용) ====================

const SAMPLE_DATA = [
  { region: "서울", product: "노트북", quarter: "Q1", sales: 1500000, quantity: 15 },
  { region: "서울", product: "노트북", quarter: "Q2", sales: 1800000, quantity: 18 },
  { region: "서울", product: "노트북", quarter: "Q3", sales: 2100000, quantity: 21 },
  { region: "서울", product: "노트북", quarter: "Q4", sales: 2500000, quantity: 25 },
  { region: "서울", product: "스마트폰", quarter: "Q1", sales: 2000000, quantity: 40 },
  { region: "서울", product: "스마트폰", quarter: "Q2", sales: 2200000, quantity: 44 },
  { region: "서울", product: "스마트폰", quarter: "Q3", sales: 2500000, quantity: 50 },
  { region: "서울", product: "스마트폰", quarter: "Q4", sales: 3000000, quantity: 60 },
  { region: "서울", product: "태블릿", quarter: "Q1", sales: 800000, quantity: 10 },
  { region: "서울", product: "태블릿", quarter: "Q2", sales: 900000, quantity: 11 },
  { region: "서울", product: "태블릿", quarter: "Q3", sales: 1000000, quantity: 12 },
  { region: "서울", product: "태블릿", quarter: "Q4", sales: 1200000, quantity: 15 },
  { region: "부산", product: "노트북", quarter: "Q1", sales: 1000000, quantity: 10 },
  { region: "부산", product: "노트북", quarter: "Q2", sales: 1200000, quantity: 12 },
  { region: "부산", product: "노트북", quarter: "Q3", sales: 1400000, quantity: 14 },
  { region: "부산", product: "노트북", quarter: "Q4", sales: 1600000, quantity: 16 },
  { region: "부산", product: "스마트폰", quarter: "Q1", sales: 1500000, quantity: 30 },
  { region: "부산", product: "스마트폰", quarter: "Q2", sales: 1700000, quantity: 34 },
  { region: "부산", product: "스마트폰", quarter: "Q3", sales: 1900000, quantity: 38 },
  { region: "부산", product: "스마트폰", quarter: "Q4", sales: 2200000, quantity: 44 },
  { region: "부산", product: "태블릿", quarter: "Q1", sales: 500000, quantity: 6 },
  { region: "부산", product: "태블릿", quarter: "Q2", sales: 600000, quantity: 7 },
  { region: "부산", product: "태블릿", quarter: "Q3", sales: 700000, quantity: 8 },
  { region: "부산", product: "태블릿", quarter: "Q4", sales: 800000, quantity: 10 },
  { region: "대구", product: "노트북", quarter: "Q1", sales: 700000, quantity: 7 },
  { region: "대구", product: "노트북", quarter: "Q2", sales: 850000, quantity: 8 },
  { region: "대구", product: "노트북", quarter: "Q3", sales: 900000, quantity: 9 },
  { region: "대구", product: "노트북", quarter: "Q4", sales: 1100000, quantity: 11 },
  { region: "대구", product: "스마트폰", quarter: "Q1", sales: 1000000, quantity: 20 },
  { region: "대구", product: "스마트폰", quarter: "Q2", sales: 1200000, quantity: 24 },
  { region: "대구", product: "스마트폰", quarter: "Q3", sales: 1300000, quantity: 26 },
  { region: "대구", product: "스마트폰", quarter: "Q4", sales: 1500000, quantity: 30 },
  { region: "대구", product: "태블릿", quarter: "Q1", sales: 400000, quantity: 5 },
  { region: "대구", product: "태블릿", quarter: "Q2", sales: 450000, quantity: 5 },
  { region: "대구", product: "태블릿", quarter: "Q3", sales: 500000, quantity: 6 },
  { region: "대구", product: "태블릿", quarter: "Q4", sales: 600000, quantity: 7 },
];

const SAMPLE_FIELDS: PivotFieldConfig[] = [
  {
    field: "region",
    caption: "지역",
    area: "row",
    areaIndex: 0,
    dataType: "string",
    visible: true,
  },
  {
    field: "product",
    caption: "제품",
    area: "row",
    areaIndex: 1,
    dataType: "string",
    visible: true,
  },
  {
    field: "quarter",
    caption: "분기",
    area: "column",
    areaIndex: 0,
    dataType: "string",
    visible: true,
  },
  {
    field: "sales",
    caption: "매출",
    area: "data",
    areaIndex: 0,
    dataType: "number",
    summaryType: "sum",
    format: { type: "number", precision: 0 },
    visible: true,
  },
];

/**
 * PivotGrid 래퍼 컴포넌트 (디자인 모드에서 샘플 데이터 주입)
 */
const PivotGridWrapper: React.FC<any> = (props) => {
  // 컴포넌트 설정에서 값 추출
  const componentConfig = props.componentConfig || props.config || {};
  const configFields = componentConfig.fields || props.fields;
  const configData = props.data;
  
  // 🆕 테이블에서 데이터 자동 로딩
  const [loadedData, setLoadedData] = useState<any[]>([]);
  const [isLoading, setIsLoading] = useState(false);
  
  useEffect(() => {
    const loadTableData = async () => {
      const tableName = componentConfig.dataSource?.tableName;
      
      // 데이터가 이미 있거나, 테이블명이 없으면 로딩하지 않음
      if (configData || !tableName || props.isDesignMode) {
        return;
      }
      
      setIsLoading(true);
      try {
        const response = await dataApi.getTableData(tableName, {
          page: 1,
          size: 10000, // 피벗 분석용 대량 데이터
        });
        
        // dataApi.getTableData는 { data, total, page, size, totalPages } 구조
        if (response.data && Array.isArray(response.data)) {
          setLoadedData(response.data);
        } else {
          console.error("❌ [PivotGrid] 데이터 로딩 실패: 응답에 data 배열이 없음");
          setLoadedData([]);
        }
      } catch (error) {
        console.error("❌ [PivotGrid] 데이터 로딩 에러:", error);
      } finally {
        setIsLoading(false);
      }
    };
    
    loadTableData();
  }, [componentConfig.dataSource?.tableName, configData, props.isDesignMode]);

  // 디자인 모드 판단:
  // 1. isDesignMode === true
  // 2. isInteractive === false (편집 모드)
  const isDesignMode = props.isDesignMode === true || props.isInteractive === false;
  
  // 🆕 실제 데이터 우선순위: props.data > loadedData > 샘플 데이터
  const actualData = configData || loadedData;
  const hasValidData = actualData && Array.isArray(actualData) && actualData.length > 0;
  const hasValidFields = configFields && Array.isArray(configFields) && configFields.length > 0;
  
  // 디자인 모드이거나 데이터가 없으면 샘플 데이터 사용
  const usePreviewData = isDesignMode || (!hasValidData && !isLoading);

  // 최종 데이터/필드 결정
  const finalData = usePreviewData ? SAMPLE_DATA : actualData;
  const finalFields = hasValidFields ? configFields : SAMPLE_FIELDS;
  const finalTitle = usePreviewData 
    ? (componentConfig.title || props.title || "피벗 그리드") + " (미리보기)"
    : (componentConfig.title || props.title);

  // 총계 설정
  const totalsConfig = componentConfig.totals || props.totals || {
    showRowGrandTotals: true,
    showColumnGrandTotals: true,
    showRowTotals: true,
    showColumnTotals: true,
  };

  // 🆕 로딩 중 표시
  if (isLoading) {
    return (
      <div className="flex items-center justify-center h-64 bg-muted/30 rounded-lg">
        <div className="text-center space-y-2">
          <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-primary mx-auto"></div>
          <p className="text-sm text-muted-foreground">데이터 로딩 중...</p>
        </div>
      </div>
    );
  }

  // 에러 경계로 감싸서 렌더링 에러 시 컴포넌트가 완전히 사라지지 않도록 함
  return (
    <PivotGridErrorBoundary>
      <PivotGridComponent
        title={finalTitle}
        data={finalData}
        fields={finalFields}
        totals={totalsConfig}
        style={componentConfig.style || props.style}
        fieldChooser={componentConfig.fieldChooser || props.fieldChooser}
        chart={componentConfig.chart || props.chart}
        allowExpandAll={componentConfig.allowExpandAll !== false}
        height="100%"
        maxHeight={componentConfig.maxHeight || props.maxHeight}
        exportConfig={componentConfig.exportConfig || props.exportConfig || { excel: true }}
        onCellClick={props.onCellClick}
        onCellDoubleClick={props.onCellDoubleClick}
        onFieldDrop={props.onFieldDrop}
        onExpandChange={props.onExpandChange}
      />
    </PivotGridErrorBoundary>
  );
};

/**
 * PivotGrid 컴포넌트 정의
 */
const PivotGridDefinition = createComponentDefinition({
  id: "pivot-grid",
  name: "피벗 그리드",
  nameEng: "PivotGrid Component",
  description: "다차원 데이터 분석을 위한 피벗 테이블 컴포넌트",
  category: ComponentCategory.DISPLAY,
  webType: "text",
  component: PivotGridWrapper, // 래퍼 컴포넌트 사용
  defaultConfig: {
    dataSource: {
      type: "table",
      tableName: "",
    },
    fields: SAMPLE_FIELDS,
    // 미리보기용 샘플 데이터
    sampleData: SAMPLE_DATA,
    totals: {
      showRowGrandTotals: true,
      showColumnGrandTotals: true,
      showRowTotals: true,
      showColumnTotals: true,
    },
    style: {
      theme: "default",
      headerStyle: "default",
      cellPadding: "normal",
      borderStyle: "light",
      alternateRowColors: true,
      highlightTotals: true,
    },
    allowExpandAll: true,
    exportConfig: {
      excel: true,
    },
    height: "400px",
  },
  defaultSize: { width: 800, height: 500 },
  configPanel: PivotGridConfigPanel,
  icon: "BarChart3",
  tags: ["피벗", "분석", "집계", "그리드", "데이터"],
  version: "1.0.0",
  author: "개발팀",
  documentation: "",
});

/**
 * PivotGrid 렌더러
 * 자동 등록 시스템을 사용하여 컴포넌트를 레지스트리에 등록
 */
export class PivotGridRenderer extends AutoRegisteringComponentRenderer {
  static componentDefinition = PivotGridDefinition;

  render(): React.ReactElement {
    const props = this.props as any;
    
    // 컴포넌트 설정에서 값 추출
    const componentConfig = props.componentConfig || props.config || {};
    const configFields = componentConfig.fields || props.fields;
    const configData = props.data;

    // 디자인 모드 판단:
    // 1. isDesignMode === true
    // 2. isInteractive === false (편집 모드)
    // 3. 데이터가 없는 경우
    const isDesignMode = props.isDesignMode === true || props.isInteractive === false;
    const hasValidData = configData && Array.isArray(configData) && configData.length > 0;
    const hasValidFields = configFields && Array.isArray(configFields) && configFields.length > 0;
    
    // 디자인 모드이거나 데이터가 없으면 샘플 데이터 사용
    const usePreviewData = isDesignMode || !hasValidData;

    // 최종 데이터/필드 결정
    const finalData = usePreviewData ? SAMPLE_DATA : configData;
    const finalFields = hasValidFields ? configFields : SAMPLE_FIELDS;
    const finalTitle = usePreviewData 
      ? (componentConfig.title || props.title || "피벗 그리드") + " (미리보기)"
      : (componentConfig.title || props.title);

    // 총계 설정
    const totalsConfig = componentConfig.totals || props.totals || {
      showRowGrandTotals: true,
      showColumnGrandTotals: true,
      showRowTotals: true,
      showColumnTotals: true,
    };

    return (
      <PivotGridComponent
        title={finalTitle}
        data={finalData}
        fields={finalFields}
        totals={totalsConfig}
        style={componentConfig.style || props.style}
        fieldChooser={componentConfig.fieldChooser || props.fieldChooser}
        chart={componentConfig.chart || props.chart}
        allowExpandAll={componentConfig.allowExpandAll !== false}
        height="100%"
        maxHeight={componentConfig.maxHeight || props.maxHeight}
        exportConfig={componentConfig.exportConfig || props.exportConfig || { excel: true }}
        onCellClick={props.onCellClick}
        onCellDoubleClick={props.onCellDoubleClick}
        onFieldDrop={props.onFieldDrop}
        onExpandChange={props.onExpandChange}
      />
    );
  }
}

// 자동 등록 실행
PivotGridRenderer.registerSelf();

// 강제 등록 (디버깅용)
if (typeof window !== "undefined") {
  setTimeout(() => {
    try {
      PivotGridRenderer.registerSelf();
    } catch (error) {
      console.error("❌ PivotGrid 강제 등록 실패:", error);
    }
  }, 1000);
}