const cookieParser = require('cookie-parser');
const cors = require("cors");
const fs = require("fs");
const path = require("path");
const express = require("express");
const axios = require("axios");
const SERVER_PORT = process.env.port || process.env.PORT || 53000;
const authProvider = require('./auth/AuthProvider');
const {getFetch, updateFetch} = require('./fetch');
const bodyParser = require('body-parser');
const https = require('https');
const JSZIP = require('jszip');
require('dotenv').config({ path: './env/.env.test' });
const session = require('express-session');
const multer  = require('multer');
const { throws } = require('assert');
let _ZIP;
const storage =  multer.diskStorage({
  destination: function (req, file, cb) { 
    cb(null, 'uploads/')  
  },
  filename: function (req, file, cb) {
    cb(null, file.originalname)              // 원래 파일이름으로 저장
  }
})
const upload = multer(storage);

const serverApp = express();
const endPoint = process.env.GRAPH_API_ENDPOINT + 'v1.0';
Buffer.prototype.toArrayInteger = function(){
  if (this.length > 0) {
      const data = new Array(this.length);
      for (let i = 0; i < this.length; i=i+1)
          data[i] = this[i];
      return data;
  }
  return [];
}
serverApp.use(session({
  secret: process.env.EXPRESS_SESSION_SECRET,
  resave: false,
  saveUninitialized: true,
  cookie: {
      httpOnly: true,
      secure: true, // set this to true on production
      sameSite: 'none',
      maxAge: 60 * 60 * 24 * 1000
  }
}));

serverApp.set(express.json());
serverApp.use(cookieParser());
serverApp.use(express.urlencoded({ extended: false }));
serverApp.use("/static",express.static(path.join(__dirname, 'static')));
serverApp.use("/node_modules",express.static(path.join(__dirname, 'node_modules')));

const options = {
  key: process.env.SSL_KEY_FILE ? fs.readFileSync(process.env.SSL_KEY_FILE) : undefined,
  cert: process.env.SSL_CRT_FILE ? fs.readFileSync(process.env.SSL_CRT_FILE) : undefined,
};

const server = https.createServer(options, serverApp);

const corsOption = {
  origin: "*",
}


serverApp.use(cors(corsOption));
serverApp.use(bodyParser.json());

server.listen(SERVER_PORT, function () {
  console.log(`\n${serverApp.name} listening to ${SERVER_PORT}`);
});

serverApp.get("/tab", 
  isAuthenticated, 
  async function (req, res, next) {
    res.sendFile(path.join(__dirname, "/views/hello.html"), 
      { idTokenClaims: req.session.account.idTokenClaims }
    );
  }
);

function isAuthenticated(req, res, next) {
  if (!req.session.isAuthenticated) {
    return res.redirect('/auth/signin'); // redirect to sign-in route
  }
  next();
}; 

function isAccessToken(req, res, next) {
  if (!req.session.accessToken) {
    return authProvider.acquireToken({
      scopes: ['.default'],
      redirectUri: 'https://localhost:53000/redirect',
      successRedirect: '/api-redirect'
    })(req, res, next);
  }
  next();
}

serverApp.get("/auth/signin", authProvider.login({
  scopes: ['.default'],
  redirectUri: 'https://localhost:53000/redirect',
  successRedirect: '/tab'
}))

serverApp.post("/redirect", authProvider.handleRedirect());

serverApp.post("/api-get",   
  isAuthenticated,
  isAccessToken, 
  async (req, res, next) => {
    const uri = req.body.api_uri || req.session.apiUri;
    let param = {};
    if (req.session.param) {
      param = req.session.param;
    }
    try {
        const graphResponse = await getFetch(endPoint + uri, req.session.accessToken, param);
        res.json(graphResponse);
    } catch (error) {
        next(error);
    }
});

serverApp.get("/api-redirect", 
  isAuthenticated,
  async function (req, res, next) {
      const uri = req.session.apiUri;
      let param = {};
      if (req.session.param) {
        param = req.session.param;
      }
      try {
          const graphResponse = await getFetch(endPoint + uri, req.session.accessToken, param);
          res.json(graphResponse);
      } catch (error) {
          next(error);
      }
})

serverApp.get("/post-redirect", 
  isAuthenticated,
  async function (req, res, next) {
    const uri = req.session.apiUri;
    let param = {};
      if (req.session.param) {
        param = req.session.param;
      }
    try {
        const graphResponse = await updateFetch(endPoint + uri, req.session.accessToken, param);
        res.json(graphResponse);
    } catch (error) {
        next(error);
    }
  }
)

serverApp.post("/api-update", authProvider.acquireToken({
  scopes: [],
  redirectUri: 'https://localhost:53000/redirect',
  successRedirect: '/post-redirect'
}));

serverApp.post("/api-post", authProvider.acquireToken({
  scopes: ['.default'],
  redirectUri: 'https://localhost:53000/redirect',
  successRedirect: '/post-redirect'
}));

serverApp.post("/getGroupList", authProvider.acquireToken({
  scopes: ['.default'],
  redirectUri: 'https://localhost:53000/redirect',
  successRedirect: '/group-redirect'
}));

serverApp.get("/group-redirect", 
  isAuthenticated,
  async function (req, res, next) {
    // return;
    try {
        const oneDrive = await getFetch(endPoint + "/me/drive/root", req.session.accessToken);
        const sharePointIds = await getFetch(endPoint + "/me/drive/SharePointIds", req.session.accessToken);
        const graphResponse = await getFetch(endPoint + "/me/joinedTeams", req.session.accessToken);
        const sites = await getFetch(endPoint + "/sites/root", req.session.accessToken);
        const sitesSharePoint = await getFetch(endPoint + "/sites/root/SharePointIds", req.session.accessToken);

        const teams = graphResponse.value;
        oneDrive.sharePoint = sharePointIds;
        sites.sharePoint = sitesSharePoint;
        const resultObj = {
          oneDrive : {
            teams: oneDrive,
          },
          joinedTeams : {
            teams : teams,
            items : {},
          },
          sites : {
            teams : sites,
          },
        }

        if (teams && teams.length) {
          const options = {
            responseType: 'arraybuffer',
            headers: {
              Authorization: `Bearer ${req.session.accessToken}`,
              ConsistencyLevel: 'eventual',
            },
          };
          for (let team of teams) {
            const item = await getFetch(endPoint + "/groups/"+team.id+"/drive/items/root/children", req.session.accessToken);
            const sharePoint = await getFetch(endPoint + "/groups/"+team.id+"/drive/SharePointIds", req.session.accessToken);
            if (sharePoint) {
              team.sharePoint = sharePoint;
            }
            if (item && item.value) {
              resultObj.joinedTeams.items[team.id] = item.value;
            }
          }
        }
        res.json(resultObj);
    } catch (error) {
        next(error);
    } 
  }
)

serverApp.post('/makeFolder', 
    isAuthenticated,
    (req, res, next)=>{
      if (!req.session.accessToken) {
        return authProvider.acquireToken({
          scopes: ['.default'],
          redirectUri: 'https://localhost:53000/redirect',
          successRedirect: '/makeFolder'
        })(req, res, next);
      }
      next();
    },
    async (req, res, next)=>{

      const options = {
        headers: {
          Authorization: `Bearer ${req.session.accessToken}`,
        },
      };
      const {siteId, path, param} = req.body;
      try{
        const sitesInfo = await axios.get(endPoint + "/sites/"+ siteId + path, options);
        if (sitesInfo.data) {
          const itemId = sitesInfo.data.id;
          const result = await axios.post(endPoint + "/sites/"+ siteId +"/drive/items/" + itemId +"/children", JSON.parse(param), options);
          res.json(result.data)
        }
      }
      catch(error) {
        console.log(error.response.data.error); 
        
        // resultObj.success = 'F';
        // resultObj.message = '선택하신 파일 정보 삭제중 오류가 발생하였습니다.\n' + error.response.data.error.message;
        // return res.json(resultObj);
      }
})

serverApp.post('/uploadItems', upload.array('file'),
  isAuthenticated,
  (req, res, next)=>{
    if (!req.session.accessToken) {
      return authProvider.acquireToken({
        scopes: ['.default'],
        redirectUri: 'https://localhost:53000/redirect',
        successRedirect: '/uploadItems' 
      })(req, res, next);
    }
    next();
  },
  async (req, res, next)=>{
    const startTime = new Date();
    const folderParam = {
      name: '',
      folder: { },
      '@microsoft.graph.conflictBehavior': 'rename'
    }
    const files = req.files;
    let {siteId, path, folder} = req.body;

    if (siteId && path) {
      const options = {
        headers: {
          Authorization: `Bearer ${req.session.accessToken}`,
        },
      };

        if (folder) {
          if (!Array.isArray(folder)) {
            folder = [folder];
          }
          let beforeUri = '';
          let beforeItemId = '';
          for (let item of folder) {
            const fileInfo = JSON.parse(item);
            const param = {...folderParam};
            param.name = fileInfo.name;
            let folderPath = '';
            if (fileInfo.path) {
              folderPath = ':' + fileInfo.path; 
            }
            let uri = endPoint + "/sites/"+ siteId + path + folderPath;
            try {
              
              let itemId = '';
              if (beforeUri === uri) {
                itemId = beforeItemId;
              }
              else {
                const sitesInfo = await axios.get(uri, options);
                itemId = sitesInfo.data.id;
                beforeItemId = itemId;
                beforeUri = uri;
              }
              await axios.post(endPoint + "/sites/"+ siteId +"/drive/items/" + itemId +"/children", param, options);
              
              // await axios.post(endPoint + "/sites/"+ siteId +"/drive/items/" + itemId +"/children", param, options);
            }
            catch(error) {
                console.log(error);
                // next(error);
                return res.json({success:'F', message: '요청하신 파일 업로드 중 오류가 발생하였습니다.', error : error});
            }
          }
        }
        if (files && files.length > 0) {
          const promiseArray = [];
          let beforeUri = '';
          let beforeItemId = '';
          for (let file of files) {
            // const fileName = file.originalname.substring(0, file.originalname.lastIndexOf('.'));
            const fileName = file.originalname;
            let filePath = req.body[ fileName + "_path"];
            file.originalname = Buffer.from(file.originalname, 'ascii').toString('utf8');

            try { 
              let formatPath = '';
              if (filePath) {
                if (Array.isArray(filePath) && filePath.length > 0) {
                  formatPath = ":" + filePath[0];
                  if (filePath.length > 1) {
                    req.body[ fileName + "_path"] = filePath.splice(1); 
                  }
                }
                else if (filePath.trim()){
                  formatPath = ":" + filePath;
                }
              }
              let itemId = '';
              const uri = endPoint + "/sites/"+ siteId + path + formatPath;
              if (beforeUri === uri) {
                itemId = beforeItemId;
              }
              else {
                const sitesInfo = await axios.get(uri, options);
                itemId = sitesInfo.data.id;
                beforeUri = uri;
                beforeItemId = itemId; 
              }
              // const uploadUri = endPoint + "/sites/"+ siteId +"/drive/items/"+itemId+':/'+file.originalname+':/content';
              const fileOptions = { headers: {
                Authorization: `Bearer ${req.session.accessToken}`,
                "Content-Type" : file.mimeType
              }}
              await axios.put(endPoint + "/sites/"+ siteId +"/drive/items/"+itemId+':/'+file.originalname+':/content', file.buffer, fileOptions);
            }
            catch(error) {
              if (error) {
                if (error.response) {
                  console.log(error.response.data);
                } 
                else {
                  console.log(error);
                }
              }
              return res.json({success:'F', message: '요청하신파일 업로드 중 오류가 발생하였습니다.', error : error});
            }
          }
        }
        const endTime = new Date();
        console.log('시작 시간 :', startTime, '종료 시간 :', endTime);
        res.json({success:'S', message: '요청하신 파일 업로드가 정상적으로 처리 되었습니다.'});
      }
})
serverApp.post('/api/download',
  isAuthenticated,
  (req, res, next)=>{
    if (!req.session.accessToken) {
      return authProvider.acquireToken({
        scopes: ['.default'],
        redirectUri: 'https://localhost:53000/redirect',
        successRedirect: '/api/download'
      })(req, res, next);
    }
    next();
  },
  async (req, res, next)=>{
    if (req.body) {
      const {siteId, path, fileIds, zipName} = req.body;
      if (siteId && path && fileIds) {
        const options = {
          headers: {
            Authorization: `Bearer ${req.session.accessToken}`,
          },
        };
        const arr = JSON.parse(fileIds);
        if (arr.length === 1) {
          const sitesInfo = await axios.get(endPoint + "/sites/"+ siteId + "/drive/items/" + arr[0], options);
          if (sitesInfo && sitesInfo.data) {
            const data = sitesInfo.data;
            if (data.folder) {
              const folderObj = await getFolderItems(endPoint + "/sites/"+ siteId + "/drive/items/", arr, options);
              const zip = new JSZIP();
              if (folderObj) {
                createZipFile(folderObj, zip);
                const now = new Date();
                const year = now.getFullYear().toString();
                let month = now.getMonth() + 1;
                if (month < 10) month = "0" + month;
                let date = now.getDate();
                if (date < 10) date = "0" + date;
                zip.generateAsync({
                  type: 'nodebuffer',
                  mimeType: 'application/epub+zip',
                  compression: 'DEFLATE',
                  compressionOptions: {
                    level: 9
                  },
                }).then((resZip)=>{
                  return res.json({success: 'S', data: resZip, name: data.name + '_' + year + '-' + month + '-' + date + '.zip'});
                })
                .catch((error)=>{
                  console.log(error);
                  return res.json({success: 'F', message:'파일 다운로드 중 오류가 발생하였습니다.', error: error});
                });
              }
            }
            else {
              const dataUrl = data['@microsoft.graph.downloadUrl'];
              const response = await axios.get(dataUrl, {responseType: 'arraybuffer', headers: {
                withCredentials:true,
              },});
              if (response.data) {
                const file = response.data;
                return res.json({success: 'S', data: file, type: data.file.mimeType, name: data.name});
              }
              else {
                return res.json({message:'파일 다운로드에 실패하였습니다.', success:'F'})
              }
            }
          }
        }
        else {
            try {
              const url = endPoint + "/sites/"+ siteId + "/drive/items/";
              const zip = new JSZIP();
              const downObj = await getFolderItems(url, arr, options);
              if (downObj) {
                createZipFile(downObj, zip);
                const now = new Date();
                const year = now.getFullYear().toString();
                let month = now.getMonth() + 1;
                if (month < 10) month = "0" + month;
                let date = now.getDate();
                if (date < 10) date = "0" + date;
                zip.generateAsync({
                  type: 'nodebuffer',
                  mimeType: 'application/epub+zip',
                  compression: 'DEFLATE',
                  compressionOptions: {
                    level: 9
                  },
                }).then((resZip)=>{
                  return res.json({success: 'S', data: resZip, name: zipName + '_' + year + '-' + month + '-' + date + '.zip'});
                })
                .catch((error)=>{
                  console.log(error);
                  return res.json({success: 'F', message:'파일 다운로드 중 오류가 발생하였습니다.', error: error});
                });
              }
            }
            catch(err) {
              // console.log(sitesInfo.data);
              console.log(err);
            }
          // }
        }
      }
      else {
        return res.json({message:'다운로드 파일 정보를 확인 할 수 없습니다.', success:'F'})
      }
    }
  }
)

function createZipFile(obj, zip) {
  
  if (obj.files.length > 0) {
    for (let file of obj.files) {
      zip.file(file.name, file.data);
    }
  }

  if (obj.folder.length > 0) {
    for (let folder of obj.folder) {
      zip.folder(folder.name);
      if (folder.subFolder) {
        createZipFile(folder.subFolder, zip.folder(folder.name));
      }
    }
  }
}

async function getFolderItems(url, array, options) {
  const files = [];
  // let subFolder = [];
  let folder = [];
  
  for (let fileId of array) {
    const sitesInfo = await axios.get(url + fileId, options);
    const data = sitesInfo.data;
    if (data) {
      if (data.folder) {
        const folderObj = {name : data.name, subFolder : []};
        if (data.folder.childCount) {
          const itemsData = await axios.get(url + fileId + '/children', options);
          if (itemsData && itemsData.data && itemsData.data.value.length > 0) {
            const idArr = [];
            for (let children of itemsData.data.value) {
              idArr.push(children.id);
            }
            let result = await getFolderItems(url, idArr, options);
            // subFolder.push(result);
            folderObj.subFolder = result;
          }
        }
        folder.push(folderObj);
      }
      else {
        const dataUrl = data['@microsoft.graph.downloadUrl'];
        const response = await axios.get(dataUrl, {responseType: 'arraybuffer', headers: {
          withCredentials:true,
        },});

        files.push({name : data.name, data : response.data, type: data.file.mimeType});
      }
    }
  }
  const resultObj = {
    folder : folder,
    files : files,
  };
  return resultObj;
}

serverApp.post('/deleteItems', 
  isAuthenticated,
  (req, res, next)=>{
    if (!req.session.accessToken) {
      return authProvider.acquireToken({
        scopes: ['.default'],
        redirectUri: 'https://localhost:53000/redirect',
        successRedirect: '/deleteItems'
      })(req, res, next);
    }
    next();
  },
  async (req, res, next)=>{
    if (req.body) {
      const {siteId, itemIds} = req.body;
      const resultObj = {success: '', message:''};
      if (siteId && itemIds) {
        const itemIdArr = JSON.parse(itemIds);
        if (itemIdArr.length > 0) {
          const options = {
            headers: {
              Authorization: `Bearer ${req.session.accessToken}`,
            },
          };
          for (let itemId of itemIdArr) {
            try{
              await axios.delete(endPoint + "/sites/"+ siteId + "/drive/items/" + itemId, options);
            }
            catch(error) {
              console.log(error.response.data.error); 
              
              resultObj.success = 'F';
              resultObj.message = '선택하신 파일 정보 삭제중 오류가 발생하였습니다.<br>' + error.response.data.error.message;
              return res.json(resultObj);
            }
          }
          resultObj.success = 'S';
          resultObj.message = '파일 정보가 삭제되었습니다.';
          res.json(resultObj);
        }
      }
      else {
        resultObj.success = 'F';
        resultObj.message = '파라미터 정보를 확인해주세요.';
        res.json(resultObj);
      }
    }
  })

serverApp.post('/api/update-name', 
  isAuthenticated,
  (req, res, next)=>{
    if (!req.session.accessToken) {
      return authProvider.acquireToken({
        scopes: ['.default'],
        redirectUri: 'https://localhost:53000/redirect',
        successRedirect: '/api/update-name'
      })(req, res, next);
    }
    next();
  },
  async (req, res, next)=>{
    if (req.body) {
      const {siteId, itemId, name} = req.body;
      const resultObj = {success: '', message:''};
      if (siteId && itemId && name) {
          const options = {
            headers: {
              Authorization: `Bearer ${req.session.accessToken}`,
            },
          };
          try{
            await axios.patch(endPoint + "/sites/"+ siteId + "/drive/items/" + itemId, {name : name}, options);
          }
          catch(error) {
            console.log(error.response.data.error); 
            
            resultObj.success = 'F';
            resultObj.message = '선택하신 파일의 이름 변경 중 오류가 발생하였습니다.<br>' + error.response.data.error.message;
            return res.json(resultObj);
          }
          resultObj.success = 'S';
          resultObj.message = '선택하신 파일의 이름이 변경되었습니다.';
          return res.json(resultObj);
        }
      }
      else {
        resultObj.success = 'F';
        resultObj.message = '파라미터 정보를 확인해주세요.';
        return res.json(resultObj);
      }
  })