import React, { Fragment } from 'react';
import io from 'socket.io-client';
import { SeafileEditor } from '@seafile/seafile-editor/dist/editor/editor.js';
import { serialize, deserialize } from '@seafile/seafile-editor/dist/utils/slate2markdown';
import 'whatwg-fetch';
import { Utils } from '../../utils/utils';
import { seafileAPI } from '../../utils/seafile-api';
import { gettext, isDocs, mediaUrl } from '../../utils/constants';
import toaster from '../../components/toast';
import ModalPortal from '../../components/modal-portal';
import ShareDialog from '../../components/dialog/share-dialog';
import InsertFileDialog from '../../components/dialog/insert-file-dialog';
import LocalDraftDialog from '../../components/dialog/local-draft-dialog';
import EditFileTagDialog from '../../components/dialog/edit-filetag-dialog';
import InsertRepoImageDialog from '../../components/dialog/insert-repo-image-dialog';
import FileParticipantDialog from '../../components/dialog/file-participant-dialog';
import HeaderToolbar from './header-toolbar';
import editorApi from './editor-api';

import '../../css/markdown-viewer/markdown-editor.css';

const CryptoJS = require('crypto-js');
const URL = require('url-parse');
const { repoID, filePath, fileName, draftID, isDraft, hasDraft, isLocked, lockedByMe } = window.app.pageOptions;
const { siteRoot, serviceUrl, seafileCollabServer } = window.app.config;
const userInfo = window.app.userInfo;
const IMAGE_SUFFIXES = ['png', 'PNG', 'jpg', 'JPG', 'jpeg', 'JPEG', 'gif', 'GIF'];


class MarkdownEditor extends React.Component {
  constructor(props) {
    super(props);
    this.timer = null;
    this.localDraft = '';
    this.autoSave = false;
    this.draftRichValue = '';
    this.draftPlainValue = '';
    this.state = {
      markdownContent: '',
      loading: true,
      mode: 'editor',
      fileInfo: {
        repoID: repoID,
        name: fileName,
        path: filePath,
        mtime: null,
        size: 0,
        starred: false,
        permission: '',
        lastModifier: '',
        id: '',
      },
      editorMode: 'rich',
      collabServer: seafileCollabServer ? seafileCollabServer : null,
      localDraftDialog: false,
      showMarkdownEditorDialog: false,
      showShareLinkDialog: false,
      showInsertFileDialog: false,
      showInsertRepoImageDialog: false,
      showFileParticipantDialog: false,
      showDraftSaved: false,
      collabUsers: userInfo ?
        [{user: userInfo, is_editing: false}] : [],
      value: null,
      isShowHistory: false,
      readOnly: true,
      contentChanged: false,
      saving: false,
      isLocked: isLocked,
      lockedByMe: lockedByMe,
      fileTagList: [],
      showEditFileTagDialog: false,
      participants: [],
    };

    if (this.state.collabServer) {
      const socket = io(this.state.collabServer);
      this.socket = socket;
      socket.on('presence', (data) => this.receivePresenceData(data));
      socket.on('repo_update', (data) => this.receiveUpdateData(data));
      socket.on('connect', () => {
        this.socket_id = socket.id;
      });
    }
  }

  toggleLockFile = () => {
    const { repoID, path } = this.state.fileInfo;
    if (this.state.isLocked) {
      seafileAPI.unlockfile(repoID, path).then((res) => {
        this.setState({ isLocked: false, lockedByMe: false });
      });
    } else {
      seafileAPI.lockfile(repoID, path).then((res) => {
        this.setState({ isLocked: true, lockedByMe: true });
      });
    }
  }

  emitSwitchEditor = (is_editing=false) => {
    if (userInfo && this.state.collabServer) {
      const { repoID, path } = this.state.fileInfo;
      this.socket.emit('presence', {
        request: 'editing',
        doc_id: CryptoJS.MD5(repoID+path).toString(),
        user: userInfo,
        is_editing,
      });
    }
  }

  receiveUpdateData (data) {
    let currentTime = new Date();
    if ((parseFloat(currentTime - this.lastModifyTime)/1000) <= 5) {
      return;
    }
    editorApi.fileMetaData().then((res) => {
      if (res.data.id !== this.state.fileInfo.id) {
        toaster.notify(
          <span>
            {gettext('This file has been updated.')}
            <a href='' >{' '}{gettext('Refresh')}</a>
          </span>,
          {id: 'repo_updated', duration: 3600});
      }
    });
  }


  receivePresenceData(data) {
    switch(data.response) {
      case 'user_join':
        toaster.notify(`user ${data.user.name} joined`, {
          duration: 3
        });
        return;

      case 'user_left':
        toaster.notify(`user ${data.user.name} left`, {
          duration: 3
        });
        return;
      case 'update_users':
        for (var prop in data.users) {
          if (Object.prototype.hasOwnProperty.call(data.users, prop)) {
            if (prop === this.socket_id) {
              data.users[prop]['myself'] = true;
              break;
            }
          }
        }
        this.setState({collabUsers: Object.values(data.users)});
        return;
      case 'user_editing':
        toaster.danger(`user ${data.user.name} is editing this file!`, {
          duration: 3
        });
        return;
      default:
        console.log('unknown response type: ' + data.response);
        return;
    }
  }

  toggleCancel = () => {
    this.setState({
      showMarkdownEditorDialog: false,
      showShareLinkDialog: false,
      showInsertFileDialog: false,
      showInsertRepoImageDialog: false,
      showEditFileTagDialog: false,
      showFileParticipantDialog: false,
    });
  }

  setEditorMode = (type) => {
    this.setState({
      editorMode: type
    });
  }

  setDraftValue = (type, value) => {
    if (type === 'rich') {
      this.draftRichValue = value;
    } else {
      this.draftPlainValue = value;
    }
  }

  setContent = (str) => {
    let value = deserialize(str);
    this.setState({
      markdownContent: str,
      value: value,
    });
  }

  checkDraft = () => {
    let draftKey = editorApi.getDraftKey();
    let draft = localStorage.getItem(draftKey);
    let that = this;
    if (draft) {
      that.setState({
        localDraftDialog: true,
      });
      that.localDraft = draft;
      localStorage.removeItem(draftKey);
    }
  }

  useDraft = () => {
    this.setState({
      localDraftDialog: false,
      loading: false,
      markdownContent: this.localDraft,
      editorMode: 'rich',
    });
    this.emitSwitchEditor(true);
  }

  deleteDraft = () => {
    if (this.state.localDraftDialog) {
      this.setState({
        localDraftDialog: false,
        loading: false,
      });
    }
    let draftKey = editorApi.getDraftKey();
    localStorage.removeItem(draftKey);
  }

  closeDraftDialog = () => {
    this.setState({
      localDraftDialog: false
    });
  }

  clearTimer = () => {
    clearTimeout(this.timer);
    this.timer = null;
  }

  openDialogs = (option) => {
    switch(option)
    {
      case 'help':
        window.richMarkdownEditor.showHelpDialog();
        break;
      case 'share_link':
        this.setState({
          showMarkdownEditorDialog: true,
          showShareLinkDialog: true,
        });
        break;
      case 'insert_file':
        this.setState({
          showMarkdownEditorDialog: true,
          showInsertFileDialog: true,
        });
        break;
      case 'insert_repo_image':
        this.setState({
          showMarkdownEditorDialog: true,
          showInsertRepoImageDialog: true,
        });
        break;
      case 'file_tags':
        this.setState({
          showEditFileTagDialog: true,
          showMarkdownEditorDialog: true,
        });
        break;
      case 'add-participant':
        this.setState({
          showMarkdownEditorDialog: true,
          showFileParticipantDialog: true,
        });
        break;
      default:
        return;
    }
  }

  componentWillUnmount() {
    this.socket.emit('repo_update', {
      request: 'unwatch_update',
      repo_id: editorApi.repoID,
      user: {
        name: editorApi.name,
        username: editorApi.username,
        contact_email: editorApi.contact_email,
      },
    });
  }

  async componentDidMount() {

    // get file info
    const fileInfoRes = await seafileAPI.getFileInfo(repoID, filePath);
    const { mtime, size, starred, permission, last_modifier_name, id } = fileInfoRes.data;
    const lastModifier = last_modifier_name;

    // get file download url
    const fileDownloadUrlRes = await seafileAPI.getFileDownloadLink(repoID, filePath);
    const downloadUrl = fileDownloadUrlRes.data;

    // get file content
    const fileContentRes = await seafileAPI.getFileContent(downloadUrl);
    const markdownContent = fileContentRes.data;
    const value = deserialize(markdownContent);

    // init permission
    let hasPermission = permission === 'rw' || permission === 'cloud-edit';

    // get custom permission
    if (permission.startsWith('custom-')) {
      const permissionID = permission.split('-')[1];
      const customPermissionRes = await seafileAPI.getCustomPermission(repoID, permissionID);
      const customPermission = customPermissionRes.data.permission;
      const { modify: canModify } = customPermission.permission;
      hasPermission = canModify ? true : hasPermission;
    }

    // Goto rich edit page
    // First, the user has the relevant permissions, otherwise he can only enter the viewer interface or cannot access
    // case1: If file is draft file
    // case2: If mode == 'edit' and the file has no draft
    // case3: The length of markDownContent is 1 when clear all content in editor and the file has no draft
    const { fileInfo } = this.state;
    this.setState({
      loading: false,
      fileInfo: {...fileInfo, mtime, size, starred, permission, lastModifier, id},
      markdownContent,
      value,
      readOnly: !hasPermission || hasDraft,
    });

    if (userInfo && this.socket) {
      const { repoID, path } = this.state.fileInfo;
      this.socket.emit('presence', {
        request: 'join_room',
        doc_id: CryptoJS.MD5(repoID+path).toString(),
        user: userInfo
      });

      this.socket.emit('repo_update', {
        request: 'watch_update',
        repo_id: editorApi.repoID,
        user: {
          name: editorApi.name,
          username: editorApi.username,
          contact_email: editorApi.contact_email,
        },
      });
    }
    this.checkDraft();
    this.listFileTags();

    this.listFileParticipants();
    window.showParticipants = true;
    setTimeout(() => {
      let url = new URL(window.location.href);
      if (url.hash) {
        window.location.href = url;
      }
    }, 100);
  }

  listFileTags = () => {
    seafileAPI.listFileTags(repoID, filePath).then(res => {
      let fileTagList = res.data.file_tags;
      for (let i = 0; i < fileTagList.length; i++) {
        fileTagList[i].id = fileTagList[i].file_tag_id;
      }
      this.setState({ fileTagList: fileTagList });
    });
  }

  onFileTagChanged = () => {
    this.listFileTags();
  }

  listFileParticipants = () => {
    editorApi.listFileParticipant().then((res) => {
      this.setState({ participants: res.data.participant_list });
    });
  }

  onParticipantsChange = () => {
    this.listFileParticipants();
  }

  setFileInfoMtime = (fileInfo) => {
    this.setState({
      fileInfo: Object.assign({}, this.state.fileInfo, { mtime: fileInfo.mtime, id: fileInfo.id, lastModifier: fileInfo.last_modifier_name })
    });
  };

  toggleStar = () => {
    let starrd = this.state.fileInfo.starred;
    if (starrd) {
      editorApi.unstarItem().then((response) => {
        this.setState({
          fileInfo: Object.assign({}, this.state.fileInfo, {starred: !starrd})
        });
      });
    } else if (!starrd) {
      editorApi.starItem().then((response) => {
        this.setState({
          fileInfo: Object.assign({}, this.state.fileInfo, {starred: !starrd})
        });
      });
    }
  }

  autoSaveDraft = () => {
    let that = this;
    if (that.timer) {
      return;
    }
    else {
      that.timer = setTimeout(() => {
        let str = '';
        if (this.state.editorMode == 'rich') {
          let value = this.draftRichValue;
          str = serialize(value);
        }
        else if (this.state.editorMode == 'plain') {
          str = this.draftPlainValue;
        }
        let draftKey = editorApi.getDraftKey();
        localStorage.setItem(draftKey, str);
        that.setState({
          showDraftSaved: true
        });
        setTimeout(() => {
          that.setState({
            showDraftSaved: false
          });
        }, 3000);
        that.timer = null;
      }, 60000);
    }
  }

  openParentDirectory = () => {
    window.location.href = editorApi.getParentDectionaryUrl();
  }

  onEdit = (mode) => {
    if (mode === 'rich') {
      window.seafileEditor.switchToRichTextEditor();
    } else if (mode === 'plain') {
      window.seafileEditor.switchToPlainTextEditor();
    }
  }

  toggleShareLinkDialog = () => {
    this.openDialogs('share_link');
  }

  onCommentAdded = () => {
    this.toggleCancel();
  }

  addComment = (e) => {
    e.stopPropagation();
    this.openDialogs('comment');
  }

  scrollToNode = (node) => {
    let url = new URL(window.location.href);
    url.set('hash', 'user-content-' + node.text);
    window.location.href = url.toString();
  }

  toggleHistory = () => {
    window.location.href = siteRoot + 'repo/file_revisions/' + repoID + '/?p=' + Utils.encodePath(filePath);
  }

  getInsertLink = (repoID, filePath) => {
    const fileName = Utils.getFileName(filePath);
    const suffix = fileName.slice(fileName.indexOf('.') + 1);
    if (IMAGE_SUFFIXES.includes(suffix)) {
      let innerURL = serviceUrl + '/lib/' + repoID + '/file' + Utils.encodePath(filePath) + '?raw=1';
      window.richMarkdownEditor.addLink(fileName, innerURL, true);
      return;
    }
    let innerURL = serviceUrl + '/lib/' + repoID + '/file' + Utils.encodePath(filePath);
    window.richMarkdownEditor.addLink(fileName, innerURL);
  }

  onContentChanged = (value) => {
    this.setState({ contentChanged: value });
  }

  onSaving = (value) => {
    this.setState({ saving: value });
  }

  render() {
    let component;
    if (this.state.loading) {
      return (
        <div className="empty-loading-page">
          <div className="lds-ripple page-centered"><div></div><div></div></div>
        </div>
      );
    } else if (this.state.mode === 'editor') {
      component = (
        <Fragment>
          <HeaderToolbar
            isDocs={isDocs}
            hasDraft={hasDraft}
            isDraft={isDraft}
            editorApi={editorApi}
            collabUsers={this.state.collabUsers}
            fileInfo={this.state.fileInfo}
            toggleStar={this.toggleStar}
            openParentDirectory={this.openParentDirectory}
            openDialogs={this.openDialogs}
            toggleShareLinkDialog={this.toggleShareLinkDialog}
            onEdit={this.onEdit}
            toggleNewDraft={editorApi.createDraftFile}
            showFileHistory={this.state.isShowHistory ? false : true }
            toggleHistory={this.toggleHistory}
            readOnly={this.state.readOnly}
            mode={this.state.mode}
            editorMode={this.state.editorMode}
            contentChanged={this.state.contentChanged}
            saving={this.state.saving}
            showDraftSaved={this.state.showDraftSaved}
            isLocked={this.state.isLocked}
            lockedByMe={this.state.lockedByMe}
            toggleLockFile={this.toggleLockFile}
          />
          <SeafileEditor
            scriptSource={mediaUrl + 'js/mathjax/tex-svg.js'}
            fileInfo={this.state.fileInfo}
            markdownContent={this.state.markdownContent}
            editorApi={editorApi}
            collabUsers={this.state.collabUsers}
            setFileInfoMtime={this.setFileInfoMtime}
            toggleStar={this.toggleStar}
            showFileHistory={true}
            setEditorMode={this.setEditorMode}
            setContent={this.setContent}
            draftID={draftID}
            isDraft={isDraft}
            mode={this.state.mode}
            emitSwitchEditor={this.emitSwitchEditor}
            hasDraft={hasDraft}
            editorMode={this.state.editorMode}
            siteRoot={siteRoot}
            autoSaveDraft={this.autoSaveDraft}
            setDraftValue={this.setDraftValue}
            clearTimer={this.clearTimer}
            openDialogs={this.openDialogs}
            deleteDraft={this.deleteDraft}
            readOnly={this.state.readOnly}
            onContentChanged={this.onContentChanged}
            onSaving={this.onSaving}
            contentChanged={this.state.contentChanged}
            saving={this.state.saving}
            fileTagList={this.state.fileTagList}
            participants={this.state.participants}
            onParticipantsChange={this.onParticipantsChange}
            markdownLint={fileName.toLowerCase() !== 'index.md'}
          />
        </Fragment>
      );

      return (
        <React.Fragment>
          {this.state.localDraftDialog ?
            <ModalPortal>
              <LocalDraftDialog
                localDraftDialog={this.state.localDraftDialog}
                deleteDraft={this.deleteDraft}
                closeDraftDialog={this.closeDraftDialog}
                useDraft={this.useDraft}
              />
            </ModalPortal>
            : null}
          {component}
          {this.state.showMarkdownEditorDialog && (
            <React.Fragment>
              {this.state.showInsertFileDialog &&
                <ModalPortal>
                  <InsertFileDialog
                    repoID={repoID}
                    filePath={filePath}
                    toggleCancel={this.toggleCancel}
                    getInsertLink={this.getInsertLink}
                  />
                </ModalPortal>
              }
              {this.state.showInsertRepoImageDialog &&
                <ModalPortal>
                  <InsertRepoImageDialog
                    repoID={repoID}
                    filePath={filePath}
                    toggleCancel={this.toggleCancel}
                  />
                </ModalPortal>
              }
              {this.state.showShareLinkDialog &&
                <ModalPortal>
                  <ShareDialog
                    itemType="file"
                    itemName={this.state.fileInfo.name}
                    itemPath={filePath}
                    repoID={repoID}
                    toggleDialog={this.toggleCancel}
                    isGroupOwnedRepo={false}
                    repoEncrypted={false}
                  />
                </ModalPortal>
              }
              {this.state.showEditFileTagDialog &&
                <ModalPortal>
                  <EditFileTagDialog
                    repoID={repoID}
                    filePath={filePath}
                    fileTagList={this.state.fileTagList}
                    toggleCancel={this.toggleCancel}
                    onFileTagChanged={this.onFileTagChanged}
                  />
                </ModalPortal>
              }
              {this.state.showFileParticipantDialog &&
                <ModalPortal>
                  <FileParticipantDialog
                    repoID={repoID}
                    filePath={filePath}
                    toggleFileParticipantDialog={this.toggleCancel}
                    fileParticipantList={this.state.participants}
                    onParticipantsChange={this.onParticipantsChange}
                  />
                </ModalPortal>
              }
            </React.Fragment>
          )}
        </React.Fragment>
      );
    }
  }
}

export default  MarkdownEditor;