import React from 'react';

import path from 'path';


import { useTranslation } from 'next-i18next';
import PropTypes from 'prop-types';
import {
  Modal,
  ModalHeader,
  ModalBody,
  ModalFooter,
  Popover,
  PopoverBody,
} from 'reactstrap';
import validator from 'validator';


import Linker from '~/client/models/Linker';
import { apiv3Get } from '~/client/util/apiv3-client';
import { useCurrentPagePath } from '~/stores/context';

import PagePreviewIcon from '../Icons/PagePreviewIcon';
import SearchTypeahead from '../SearchTypeahead';

import Preview from './Preview';

import styles from './LinkEditPreview.module.scss';


class LinkEditModal extends React.PureComponent {

  constructor(props) {
    super(props);

    this.state = {
      show: false,
      isUseRelativePath: false,
      isUsePermanentLink: false,
      linkInputValue: '',
      labelInputValue: '',
      linkerType: Linker.types.markdownLink,
      markdown: null,
      pagePath: null,
      previewError: '',
      permalink: '',
      isPreviewOpen: false,
    };

    // this.isApplyPukiwikiLikeLinkerPlugin = window.growiRenderer.preProcessors.some(process => process.constructor.name === 'PukiwikiLikeLinker');

    this.show = this.show.bind(this);
    this.hide = this.hide.bind(this);
    this.cancel = this.cancel.bind(this);
    this.handleChangeTypeahead = this.handleChangeTypeahead.bind(this);
    this.handleChangeLabelInput = this.handleChangeLabelInput.bind(this);
    this.handleChangeLinkInput = this.handleChangeLinkInput.bind(this);
    this.handleSelecteLinkerType = this.handleSelecteLinkerType.bind(this);
    this.toggleIsUseRelativePath = this.toggleIsUseRelativePath.bind(this);
    this.toggleIsUsePamanentLink = this.toggleIsUsePamanentLink.bind(this);
    this.save = this.save.bind(this);
    this.generateLink = this.generateLink.bind(this);
    this.getRootPath = this.getRootPath.bind(this);
    this.toggleIsPreviewOpen = this.toggleIsPreviewOpen.bind(this);
    this.setMarkdown = this.setMarkdown.bind(this);
  }

  // defaultMarkdownLink is an instance of Linker
  show(defaultMarkdownLink = null) {
    // if defaultMarkdownLink is null, set default value in inputs.
    const { label = '', link = '' } = defaultMarkdownLink;
    let { type = Linker.types.markdownLink } = defaultMarkdownLink;

    // if type of defaultMarkdownLink is pukiwikiLink when pukiwikiLikeLinker plugin is disable, change type(not change label and link)
    if (type === Linker.types.pukiwikiLink && !this.isApplyPukiwikiLikeLinkerPlugin) {
      type = Linker.types.markdownLink;
    }

    this.parseLinkAndSetState(link, type);

    this.setState({
      show: true,
      labelInputValue: label,
      isUsePermanentLink: false,
      permalink: '',
      linkerType: type,
    });
  }

  // parse link, link is ...
  // case-1. url of this growi's page (ex. 'http://localhost:3000/hoge/fuga')
  // case-2. absolute path of this growi's page (ex. '/hoge/fuga')
  // case-3. relative path of this growi's page (ex. '../fuga', 'hoge')
  // case-4. external link (ex. 'https://growi.org')
  // case-5. the others (ex. '')
  parseLinkAndSetState(link, type) {
    // create url from link, add dummy origin if link is not valid url.
    // ex-1. link = 'https://growi.org/' -> url = 'https://growi.org/' (case-1,4)
    // ex-2. link = 'hoge' -> url = 'http://example.com/hoge' (case-2,3,5)
    const url = new URL(link, 'http://example.com');
    const isUrl = url.origin !== 'http://example.com';

    let isUseRelativePath = false;
    let reshapedLink = link;

    // if case-1, reshapedLink becomes page path
    reshapedLink = this.convertUrlToPathIfPageUrl(reshapedLink, url);

    // case-3
    if (!isUrl && !reshapedLink.startsWith('/') && reshapedLink !== '') {
      isUseRelativePath = true;
      const rootPath = this.getRootPath(type);
      reshapedLink = path.resolve(rootPath, reshapedLink);
    }

    this.setState({
      linkInputValue: reshapedLink,
      isUseRelativePath,
    });
  }

  // return path name of link if link is this growi page url, else return original link.
  convertUrlToPathIfPageUrl(link, url) {
    // when link is this growi's page url, url.origin === window.location.origin and return path name
    return url.origin === window.location.origin ? decodeURI(url.pathname) : link;
  }

  cancel() {
    this.hide();
  }

  hide() {
    this.setState({
      show: false,
    });
  }

  toggleIsUseRelativePath() {
    if (!this.state.linkInputValue.startsWith('/') || this.state.linkerType === Linker.types.growiLink) {
      return;
    }

    // User can't use both relativePath and permalink at the same time
    this.setState({ isUseRelativePath: !this.state.isUseRelativePath, isUsePermanentLink: false });
  }

  toggleIsUsePamanentLink() {
    if (this.state.permalink === '' || this.state.linkerType === Linker.types.growiLink) {
      return;
    }

    // User can't use both relativePath and permalink at the same time
    this.setState({ isUsePermanentLink: !this.state.isUsePermanentLink, isUseRelativePath: false });
  }

  async setMarkdown() {
    const { t } = this.props;
    const path = this.state.linkInputValue;
    let markdown = null;
    let pagePath = null;
    let permalink = '';
    let previewError = '';

    if (path.startsWith('/')) {
      const pathWithoutFragment = new URL(path, 'http://dummy').pathname;
      const isPermanentLink = validator.isMongoId(pathWithoutFragment.slice(1));
      const pageId = isPermanentLink ? pathWithoutFragment.slice(1) : null;

      try {
        const { data } = await apiv3Get('/page', { path: pathWithoutFragment, page_id: pageId });
        const { page } = data;
        markdown = page.revision.body;
        pagePath = page.path;
        permalink = page.id;
      }
      catch (err) {
        previewError = err.message;
      }
    }
    else {
      previewError = t('link_edit.page_not_found_in_preview', { path });
    }
    this.setState({
      markdown, pagePath, previewError, permalink,
    });
  }

  renderLinkPreview() {
    const linker = this.generateLink();
    return (
      <div className="d-flex justify-content-between mb-3 flex-column flex-sm-row">
        <div className="card card-disabled w-100 p-1 mb-0">
          <p className="text-left text-muted mb-1 small">Markdown</p>
          <p className="text-center text-truncate text-muted">{linker.generateMarkdownText()}</p>
        </div>
        <div className="d-flex align-items-center justify-content-center">
          <span className="lead mx-3">
            <i className="d-none d-sm-block fa fa-caret-right"></i>
            <i className="d-sm-none fa fa-caret-down"></i>
          </span>
        </div>
        <div className="card w-100 p-1 mb-0">
          <p className="text-left text-muted mb-1 small">HTML</p>
          <p className="text-center text-truncate">
            <a href={linker.link}>{linker.label}</a>
          </p>
        </div>
      </div>
    );
  }

  handleChangeTypeahead(selected) {
    const pageWithMeta = selected[0];
    if (pageWithMeta != null) {
      const page = pageWithMeta.data;
      const permalink = `${window.location.origin}/${page.id}`;
      this.setState({ linkInputValue: page.path, permalink });
    }
  }

  handleChangeLabelInput(label) {
    this.setState({ labelInputValue: label });
  }

  handleChangeLinkInput(link) {
    let isUseRelativePath = this.state.isUseRelativePath;
    if (!this.state.linkInputValue.startsWith('/') || this.state.linkerType === Linker.types.growiLink) {
      isUseRelativePath = false;
    }
    this.setState({
      linkInputValue: link, isUseRelativePath, isUsePermanentLink: false, permalink: '',
    });
  }

  handleSelecteLinkerType(linkerType) {
    let { isUseRelativePath, isUsePermanentLink } = this.state;
    if (linkerType === Linker.types.growiLink) {
      isUseRelativePath = false;
      isUsePermanentLink = false;
    }
    this.setState({ linkerType, isUseRelativePath, isUsePermanentLink });
  }

  save() {
    const linker = this.generateLink();

    if (this.props.onSave != null) {
      this.props.onSave(linker.generateMarkdownText());
    }

    this.hide();
  }

  generateLink() {
    const {
      linkInputValue, labelInputValue, linkerType, isUseRelativePath, isUsePermanentLink, permalink,
    } = this.state;

    let reshapedLink = linkInputValue;
    if (isUseRelativePath) {
      const rootPath = this.getRootPath(linkerType);
      reshapedLink = rootPath === linkInputValue ? '.' : path.relative(rootPath, linkInputValue);
    }

    if (isUsePermanentLink && permalink != null) {
      reshapedLink = permalink;
    }

    return new Linker(linkerType, labelInputValue, reshapedLink);
  }

  getRootPath(type) {
    const { pagePath } = this.props;
    // rootPaths of md link and pukiwiki link are different
    return type === Linker.types.markdownLink ? path.dirname(pagePath) : pagePath;
  }

  async toggleIsPreviewOpen() {
    // open popover
    if (this.state.isPreviewOpen === false) {
      this.setMarkdown();
    }
    this.setState({ isPreviewOpen: !this.state.isPreviewOpen });
  }

  renderLinkAndLabelForm() {
    const { t } = this.props;
    const { pagePath } = this.state;

    return (
      <>
        <h3 className="grw-modal-head">{t('link_edit.set_link_and_label')}</h3>
        <form className="form-group">
          <div className="form-gorup my-3">
            <div className="input-group flex-nowrap">
              <div className="input-group-prepend">
                <span className="input-group-text">{t('link_edit.link')}</span>
              </div>
              <SearchTypeahead
                onChange={this.handleChangeTypeahead}
                onInputChange={this.handleChangeLinkInput}
                inputName="link"
                placeholder={t('link_edit.placeholder_of_link_input')}
                keywordOnInit={this.state.linkInputValue}
                autoFocus
              />
              <div className="d-none d-sm-block input-group-append">
                <button type="button" id="preview-btn" className={`btn btn-info btn-page-preview ${styles['btn-page-preview']}`}>
                  <PagePreviewIcon />
                </button>
                <Popover trigger="focus" placement="right" isOpen={this.state.isPreviewOpen} target="preview-btn" toggle={this.toggleIsPreviewOpen}>
                  <PopoverBody>
                    {this.state.markdown != null && pagePath != null
                    && <div className={`linkedit-preview ${styles['linkedit-preview']}`}>
                      <Preview markdown={this.state.markdown} pagePath={pagePath} />
                    </div>
                    }
                  </PopoverBody>
                </Popover>
              </div>
            </div>
          </div>
          <div className="form-gorup my-3">
            <div className="input-group flex-nowrap">
              <div className="input-group-prepend">
                <span className="input-group-text">{t('link_edit.label')}</span>
              </div>
              <input
                type="text"
                className="form-control"
                id="label"
                value={this.state.labelInputValue}
                onChange={e => this.handleChangeLabelInput(e.target.value)}
                disabled={this.state.linkerType === Linker.types.growiLink}
                placeholder={this.state.linkInputValue}
              />
            </div>
          </div>
        </form>
      </>
    );
  }

  renderPathFormatForm() {
    const { t } = this.props;
    return (
      <div className="card well pt-3">
        <form className="form-group mb-0">
          <div className="form-group row">
            <label className="col-sm-3">{t('link_edit.path_format')}</label>
            <div className="col-sm-9">
              <div className="custom-control custom-checkbox custom-checkbox-info custom-control-inline">
                <input
                  className="custom-control-input"
                  id="relativePath"
                  type="checkbox"
                  checked={this.state.isUseRelativePath}
                  onChange={this.toggleIsUseRelativePath}
                  disabled={!this.state.linkInputValue.startsWith('/') || this.state.linkerType === Linker.types.growiLink}
                />
                <label className="custom-control-label" htmlFor="relativePath">
                  {t('link_edit.use_relative_path')}
                </label>
              </div>
              <div className="custom-control custom-checkbox custom-checkbox-info custom-control-inline">
                <input
                  className="custom-control-input"
                  id="permanentLink"
                  type="checkbox"
                  checked={this.state.isUsePermanentLink}
                  onChange={this.toggleIsUsePamanentLink}
                  disabled={this.state.permalink === '' || this.state.linkerType === Linker.types.growiLink}
                />
                <label className="custom-control-label" htmlFor="permanentLink">
                  {t('link_edit.use_permanent_link')}
                </label>
              </div>
            </div>
          </div>
          <div className="form-group row mb-0">
            <label className="col-sm-3">{t('link_edit.notation')}</label>
            <div className="col-sm-9">
              <div className="custom-control custom-radio custom-control-inline">
                <input
                  type="radio"
                  className="custom-control-input"
                  id="markdownType"
                  value={Linker.types.markdownLink}
                  checked={this.state.linkerType === Linker.types.markdownLink}
                  onChange={e => this.handleSelecteLinkerType(e.target.value)}
                />
                <label className="custom-control-label" htmlFor="markdownType">
                  {t('link_edit.markdown')}
                </label>
              </div>
              <div className="custom-control custom-radio custom-control-inline">
                <input
                  type="radio"
                  className="custom-control-input"
                  id="growiType"
                  value={Linker.types.growiLink}
                  checked={this.state.linkerType === Linker.types.growiLink}
                  onChange={e => this.handleSelecteLinkerType(e.target.value)}
                />
                <label className="custom-control-label" htmlFor="growiType">
                  {t('link_edit.GROWI_original')}
                </label>
              </div>
              {this.isApplyPukiwikiLikeLinkerPlugin && (
                <div className="custom-control custom-radio custom-control-inline">
                  <input
                    type="radio"
                    className="custom-control-input"
                    id="pukiwikiType"
                    value={Linker.types.pukiwikiLink}
                    checked={this.state.linkerType === Linker.types.pukiwikiLink}
                    onChange={e => this.handleSelecteLinkerType(e.target.value)}
                  />
                  <label className="custom-control-label" htmlFor="pukiwikiType">
                    {t('link_edit.pukiwiki')}
                  </label>
                </div>
              )}
            </div>
          </div>
        </form>
      </div>
    );
  }

  render() {
    const { t } = this.props;
    return (
      <Modal className="link-edit-modal" isOpen={this.state.show} toggle={this.cancel} size="lg" autoFocus={false}>
        <ModalHeader tag="h4" toggle={this.cancel} className="bg-primary text-light">
          {t('link_edit.edit_link')}
        </ModalHeader>

        <ModalBody className="container">
          <div className="row">
            <div className="col-12">
              {this.renderLinkAndLabelForm()}
              {this.renderPathFormatForm()}
            </div>
          </div>
          <div className="row">
            <div className="col-12">
              <h3 className="grw-modal-head">{t('link_edit.preview')}</h3>
              {this.renderLinkPreview()}
            </div>
          </div>
        </ModalBody>
        <ModalFooter>
          <button type="button" className="btn btn-sm btn-outline-secondary mx-1" onClick={this.hide}>
            {t('Cancel')}
          </button>
          <button type="submit" className="btn btn-sm btn-primary mx-1" onClick={this.save}>
            {t('Done')}
          </button>
        </ModalFooter>
      </Modal>
    );
  }

}

const LinkEditModalFc = React.forwardRef((props, ref) => {
  const { t } = useTranslation();
  const { data: currentPath } = useCurrentPagePath();
  return <LinkEditModal t={t} ref={ref} pagePath={currentPath} {...props} />;
});

LinkEditModal.propTypes = {
  t: PropTypes.func.isRequired,
  pagePath: PropTypes.string,
  onSave: PropTypes.func,
};


export default LinkEditModalFc;