import { useState, useEffect } from 'react';
import { getDcData } from '@/components/lib/api';


export type Folder = {
  clsfSystmSn: string;
  upClsfSystmSn: string;
  clsfSystmNm: string;
  children: Folder[];
};
export type FlattenedFolder = {
  [key: string]: string | number | undefined;
};
export type SelectDataType = {
  text: string;
  val: string;
  sido?: string; // 시도 코드 (선택 사항)
}
type ReportDataFile = {
  no: number;
  fileTitle: string;
  regDt: string;
  fileSn: string;
  filePath: string;
}
const isYear = (value: string): boolean => {
  return /^[0-9]{4}년$/.test(value);
};
export const reportGubuns = [{ val: '0', text: '전체' }, { val: '1', text: '보고서' }
  , { val: '2', text: '요약보고서' }, { val: '3', text: '부록' }, { val: '4', text: '기타' }];

  
/**
 * Flatten a hierarchical folder structure into a flat array.
 * @param data - The hierarchical folder data to flatten.
 * @returns An array of flattened folders with their paths and levels.
 */
export function flattenFolders(data: Folder[]): FlattenedFolder[] {
  const result: FlattenedFolder[] = [];
  const exceptNodeNm = ["부분", "통합", "전체"];
  const addNodeNm = ["보고서", "요약보고서", "부록", "기타"]; // level5
  const columnNms: { [key: number]: string } = {
    0: "root", 1: "sido", 2: "sigungu", 3: "approvalYear"
    , 4: "plantZoneGubun", 5: "reportGubun", 7: "fileName", 8: "regDate"
  };

  function traverse(
    node: Folder,
    path: { [key: string]: string | number },
    level: number
  ) {
    if (level === 2 && isYear(node.clsfSystmNm)) {
      level++;
    }
    if (level === 4 && addNodeNm.includes(node.clsfSystmNm)) {
      level++; // 레벨을 증가시켜 하위값에 추가되도록 함.
    }

    const newPath = {
      ...path,
      [`${columnNms[level]}`]: node.clsfSystmNm,
    };

    if (node.children.length === 0) {
      newPath.no = result.length + 1;
      newPath.clsfSystmSn = node.clsfSystmSn; // 파일 조회를 위한 고유번호
      result.push(newPath);
    } else {
      if (level === 4) {
        if (exceptNodeNm.includes(node.clsfSystmNm)) {
          level--; // 제외할 노드 이름인 경우, 현재의 레벨에 하위값이 써지도록 함.
        }
      }
      node.children.forEach((child) => {
        traverse(child, newPath, level + 1);
      });
    }
  }

  if (data && data.length > 0 && data[0]?.clsfSystmNm == "기본계획") { // data가 비어있지 않고 children이 있는 경우에만 처리
    data.forEach((root) => traverse(root, {}, 0));
  } else {
    data.forEach((root) => traverse(root, {}, 1));
  }
  return result;
}

export const getDcTree = async (clsfSystmNm: string) => {
  const result = await getDcData("/api/v1/dc/clsf?clsfSystmNm=" + clsfSystmNm);
  return result;
};
export const useDcTree = (clsfSystmNm: string) => {
  const [data, setData] = useState([]);

  useEffect(() => {
    const fetch = async () => {
      const result = await getDcTree(clsfSystmNm);
      if (result) {
        setData(result);
      }
      console.log("useDcTree호출");
      console.log("clsfSystmNm:", clsfSystmNm, "data:", result);
    };
    fetch();
  }, [clsfSystmNm]);

  return data;
};

export const getDcFile = async (clsfSystmSn: string) => {
  const queryString = 'clsfSystmSn=' + clsfSystmSn;
  const result = await getDcData(`/api/v1/dc/file${queryString ? `?${queryString}` : ''}`);
  return result;
};
export const addFileName = async (data: FlattenedFolder[]) => {
  const fileReportData = await Promise.all(
    data.map(async (item) => {
      const filenameArr: ReportDataFile[] = await getDcFile(String(item.clsfSystmSn));
      const f = filenameArr[0];
      const result = { ...item, fileName: f?.fileTitle, regDate: f?.regDt, fileSn: f?.fileSn, filePath: f?.filePath };

      return result;
    })
  );
  return fileReportData;
};
export const getDcFileprcs = async (fileSn: string) => {
  const queryString = 'fileSn=' + fileSn;
  const result = await getDcData(`/api/v1/dc/fileprcs${queryString ? `?${queryString}` : ''}`);
  return result;
};

export const getDcFileDownload = async (filePath: string) => {
  const queryString = 'filePath=' + encodeURIComponent(filePath);
  const response = await fetch(`/dc-service/api/v1/dc/file/download?${queryString}`, {
    method: 'GET',
  });
  if (!response.ok) {
    throw new Error(`File download failed: ${response.status}`);
  }
  const blob = await response.blob(); // PDF, image 등은 blob으로 받아야 함
  return blob;
};
export const fileDownload = (data: Blob, fileName: string) => { // Blob데이터 임시link로 연결
  const url = window.URL.createObjectURL(data);
  const link = document.createElement('a');
  link.href = url;
  link.download = fileName; // 원하는 파일명 지정
  document.body.appendChild(link);
  link.click();
  link.remove();
  window.URL.revokeObjectURL(url);
}
export const getFileDownload = async (fileSn: string, fileName: string, filePath: string) => {
  if (filePath === "") alert("filePath 정보 없으므로 다운로드 불가:filesn" + fileSn);
  const blobData = await getDcFileDownload(filePath); // 실제 다운로드 API
  fileDownload(blobData, fileName);
}