// Widget for editing topic description.

import React from 'react';
import { FormattedMessage } from 'react-intl';

import Tinode from 'tinode-sdk';

import AvatarCrop from './avatar-crop.jsx';
import AvatarUpload from './avatar-upload.jsx';
import InPlaceEdit from './in-place-edit.jsx';
import TagManager from './tag-manager.jsx';

import { AVATAR_SIZE, MAX_AVATAR_BYTES, MAX_EXTERN_ATTACHMENT_SIZE,
  MAX_INBAND_ATTACHMENT_SIZE, MAX_TITLE_LENGTH, MAX_TOPIC_DESCRIPTION_LENGTH } from '../config.js';
import { imageScaled, blobToBase64, makeImageUrl } from '../lib/blob-helpers.js';
import { arrayEqual, theCard } from '../lib/utils.js';

export default class TopicDescEdit extends React.Component {
  constructor(props) {
    super(props);

    const topic = this.props.tinode.getTopic(this.props.topic);
    const acs = topic.getAccessMode();
    this.state = {
      isMe: Tinode.isMeTopicName(this.props.topic),
      owner: acs && acs.isOwner(),
      fullName: topic.public ? topic.public.fn : undefined,
      private: topic.private ? topic.private.comment : null,
      description: topic.public ? topic.public.note : undefined,
      avatar: makeImageUrl(topic.public ? topic.public.photo : null),
      tags: topic.tags(),
      newAvatar: null,
      newAvatarMime: null,
      previousOnTags: topic.onTagsUpdated
    };

    this.tnNewTags = this.tnNewTags.bind(this);
    this.handleFullNameUpdate = this.handleFullNameUpdate.bind(this);
    this.handleImageUpdated = this.handleImageUpdated.bind(this);
    this.handleAvatarCropped = this.handleAvatarCropped.bind(this);
    this.handlePrivateUpdate = this.handlePrivateUpdate.bind(this);
    this.handleDescriptionUpdate = this.handleDescriptionUpdate.bind(this);
    this.uploadAvatar = this.uploadAvatar.bind(this);
    this.handleAvatarCropCancel = this.handleAvatarCropCancel.bind(this);
    this.handleTagsUpdated = this.handleTagsUpdated.bind(this);
  }

  componentDidMount() {
    const topic = this.props.tinode.getTopic(this.props.topic);
    topic.onTagsUpdated = this.tnNewTags;
  }

  componentWillUnmount() {
    const topic = this.props.tinode.getTopic(this.props.topic);
    topic.onTagsUpdated = this.state.previousOnTags;
  }

  tnNewTags(tags) {
    this.setState({tags: tags});
  }

  handleFullNameUpdate(fn) {
    fn = fn.trim().substring(0, MAX_TITLE_LENGTH);
    if (fn && this.state.fullName !== fn) {
      this.setState({fullName: fn});
      this.props.onUpdateTopicDesc(this.props.topic, theCard(fn, null));
    }
  }

  handlePrivateUpdate(comment) {
    comment = comment.trim().substring(0, MAX_TITLE_LENGTH);
    if (this.state.private !== comment) {
      this.setState({private: comment});
      this.props.onUpdateTopicDesc(this.props.topic, null, comment || Tinode.DEL_CHAR);
    }
  }

  handleDescriptionUpdate(desc) {
    desc = desc.trim().substring(0, MAX_TOPIC_DESCRIPTION_LENGTH);
    if (desc) {
      this.setState({description: desc});
      this.props.onUpdateTopicDesc(this.props.topic, theCard(null, null, null, desc));
    }
  }

  // AvatarUpload widget has changed the avatar: received a new file or deleted the avatar.
  handleImageUpdated(mime, img) {
    // This will show the AvatarCropView is img is not null.
    this.setState({newAvatar: img, newAvatarMime: mime});
    if (!img) {
      // Deleting the avatar.
      this.props.onUpdateTopicDesc(this.props.topic, theCard(null, Tinode.DEL_CHAR));
    }
  }

  // AvatarCropView calls this method when the user has cropped the image.
  handleAvatarCropped(mime, blob, width, height) {
    const url = blob ? URL.createObjectURL(blob) : null;
    this.setState({avatar: url, newAvatar: null, newAvatarMime: null});
    if (blob) {
      this.uploadAvatar(mime, blob, width, height);
    }
  }

  // Utility method for converting cropped avatar blob to bytes for sending inband or
  // for uploading it to the server out of band.
  uploadAvatar(mime, blob, width, height) {
    const readyToUpload = (mime, blob, width, height) => {
      if (blob.size > MAX_AVATAR_BYTES) {
        // Too large to send inband - uploading out of band and sending as a link.
        const uploader = this.props.tinode.getLargeFileHelper();

        this.setState({uploading: true});
        uploader.upload(blob)
          .then((url) => {
            this.props.onUpdateTopicDesc(this.props.topic, theCard(null, url));
          })
          .catch((err) => {
            this.props.onError(err, 'err');
          })
          .finally(() => {
            this.setState({uploading: false});
          });
      } else {
        this.setState({uploading: true});
        // Convert blob to base64-encoded bits.
        blobToBase64(blob, (unused, base64bits) => {
          const du = makeImageUrl({data: base64bits, type: mime});
          this.setState({source: du});
          this.props.onUpdateTopicDesc(this.props.topic, theCard(null, du));
          this.setState({uploading: false});
        });
      }
    };

    if (width > AVATAR_SIZE || height > AVATAR_SIZE || width != height) {
      // Avatar is not square or too large even after cropping. Shrink it and make square.
      imageScaled(blob, AVATAR_SIZE, AVATAR_SIZE, MAX_EXTERN_ATTACHMENT_SIZE, true,
        readyToUpload,
        (err) => {
          this.props.onError(err, 'err');
        });
    } else {
      readyToUpload(mime, blob, width, height);
    }
  }

  handleAvatarCropCancel(img) {
    this.setState({newAvatar: null, newAvatarMime: null});
  }

  handleTagsUpdated(tags) {
    // Check if tags have actually changed.
    if (arrayEqual(this.state.tags.slice(0), tags.slice(0))) {
      return;
    }
    this.props.onUpdateTags(tags);
  }

  render() {
    if (this.state.newAvatar) {
      return (
        <AvatarCrop
          avatar={this.state.newAvatar}
          mime={this.state.newAvatarMime}
          onSubmit={this.handleAvatarCropped}
          onCancel={this.handleAvatarCropCancel}
          onError={this.props.onError} />
      );
    }

    const editable = this.state.isMe || this.state.owner;

    return (
      <>
      <div className="panel-form-column">
        <center>
          <AvatarUpload
            tinode={this.props.tinode}
            avatar={this.state.avatar}
            readOnly={!editable}
            uid={this.props.topic}
            title={this.state.fullName}
            onImageUpdated={this.handleImageUpdated}
            onError={this.props.onError} />
        </center>
        {this.state.isMe ?
          <div className="group">
            <label className="small">
              <FormattedMessage id="label_your_name" defaultMessage="Your name"
              description="Label for full name editing" />
            </label>
            <div>
              <FormattedMessage id="full_name_prompt" defaultMessage="Full name, e.g. John Doe"
                description="Input placeholder for person's full name">{
              (full_name_placeholder) => <InPlaceEdit
                placeholder={full_name_placeholder}
                value={this.state.fullName}
                required={true}
                onFinished={this.handleFullNameUpdate} />
              }</FormattedMessage>
            </div>
          </div>
        :
          <>
            <div className="group">
              <div><label className="small">
                <FormattedMessage id="label_topic_name" defaultMessage="Name"
                  description="Label for editing topic name" />
              </label></div>
              <div>
                <InPlaceEdit
                  placeholder={this.state.groupTopic ? "Group name" : <i>Unknown</i>}
                  readOnly={!editable}
                  value={this.state.fullName}
                  required={true}
                  onFinished={this.handleFullNameUpdate} />
              </div>
            </div>
            <div className="group">
              <div>
                <label className="small">
                  <FormattedMessage id="label_private" defaultMessage="Private comment"
                    description="Label for editing 'private'" />
                </label>
              </div>
              <div>
                <FormattedMessage id="private_editing_placeholder"
                  defaultMessage="Visible to you only"
                  description="Placeholder for editing 'private'">{
                  (private_placeholder) => <InPlaceEdit
                    placeholder={private_placeholder}
                    value={this.state.private}
                    onFinished={this.handlePrivateUpdate} />
                }</FormattedMessage>
              </div>
            </div>
          </>
        }
        {editable || this.state.description ?
          <div className="group">
            <div><label className="small">
              <FormattedMessage id="label_description" defaultMessage="Description"
                description="Label for editing topic description" />
            </label></div>
            <div>
              <FormattedMessage id="description_editing_placeholder"
                defaultMessage="Description (optional)"
                description="Placeholder for editing topic description">{
                (private_placeholder) => <InPlaceEdit
                  placeholder={private_placeholder}
                  readOnly={!editable}
                  value={this.state.description}
                  multiline={2}
                  onFinished={this.handleDescriptionUpdate} />
              }</FormattedMessage>
            </div>
          </div>
          : null
        }
      </div>
      {editable ?
        <>
          <div className="hr" />
          <FormattedMessage id="title_tag_manager" defaultMessage="Tags (search & discovery)"
            description="Section title for TagManager">{
              (title_tag_manager) => <TagManager
                title={title_tag_manager}
                activated={false}
                tags={this.state.tags}
                tinode={this.props.tinode}
                onSubmit={this.handleTagsUpdated} />
          }</FormattedMessage>
        </>
        : null
      }
      </>
    );
  }
};