import React from 'react';
import PropTypes from 'prop-types';
import { connect } from 'react-redux';
import { FormattedMessage } from 'react-intl';
import _ from 'lodash';

import { AnnotationsDocumentsTable, Document } from '../ui';

const DocumentCategoryList = ({ stats, documents, viaBaseUrl }) => (documents || []).map(
  document => (
    <div key={document.uri} className="col col-4 mb-3 d-flex align-items-stretch">
      <Document
        document={document}
        stats={stats[document.uri]}
        viaBaseUrl={viaBaseUrl}
      />
    </div>
  ),
);

const DocumentsCategory = ({ stats, documentCategory, viaBaseUrl }) => {
  const { category, documents } = documentCategory;
  return (
    <div className="row">
      <h3>{ category }</h3>

      <div className="row">
        <DocumentCategoryList stats={stats} documents={documents} viaBaseUrl={viaBaseUrl} />
      </div>

    </div>
  );
};

DocumentsCategory.propTypes = {
  stats: PropTypes.object.isRequired,
  documentCategory: PropTypes.object.isRequired,
  viaBaseUrl: PropTypes.string.isRequired,
};

const GroupDocuments = ({ annotationsStats, categories, viaBaseUrl }) => categories.map(
  category => (
    <DocumentsCategory
      key={category.category}
      documentCategory={category}
      stats={annotationsStats}
      viaBaseUrl={viaBaseUrl}
    />
  ),
);

const DocumentsPage = ({
  documents,
  documentsMap,
  otherDocuments,
  viaBaseUrl,
  topics,
  metacategories,
  children,
}) => (
  <div className="row">
    <div className="col col-12">
      {
        children
      }
      <GroupDocuments
        annotationsStats={documents}
        categories={documentsMap}
        viaBaseUrl={viaBaseUrl}
      />
      <div className="row">
        <h3><FormattedMessage id="documents.other_documents_title" defaultMessage="Other documents" /></h3>
        <AnnotationsDocumentsTable
          documents={otherDocuments}
          viaBaseUrl={viaBaseUrl}
          topics={topics}
          metacategories={metacategories}
        />
      </div>
    </div>
  </div>
);

DocumentsPage.propTypes = {
  documents: PropTypes.object.isRequired,
  documentsMap: PropTypes.arrayOf(PropTypes.object).isRequired,
  otherDocuments: PropTypes.arrayOf(PropTypes.object).isRequired,
  viaBaseUrl: PropTypes.string.isRequired,
  metacategories: PropTypes.arrayOf(PropTypes.object).isRequired,
  topics: PropTypes.arrayOf(PropTypes.string).isRequired,
  children: PropTypes.node,
};

DocumentsPage.defaultProps = {
  children: null,
};

export default connect(
  (state, props) => {
    const { documents: { documents }, annotations: { items: annotations } } = state;
    const { documentsMap } = props;

    const documentsUrls = documentsMap.reduce(
      (res, cat) => cat.documents.reduce(
        (docRes, doc) => {
          if (!docRes.includes(doc.uri)) {
            docRes.push(doc.uri);
          }
          return docRes;
        }, res,
      ),
      [],
    );

    const otherDocuments = _(annotations)
      .filter(annot => !documentsUrls.includes(annot.uri))
      .groupBy('uri').map((d, uri) => {
        if (d.length > 0) {
          const firstAnnotation = d[0];

          const usersNb = _.chain(d)
            .map('user')
            .uniq()
            .value().length;
          const titles = firstAnnotation.document.title;
          return {
            uri,
            name: titles ? titles[0] : '',
            updated: firstAnnotation.updated,
            usersNb,
            annotationsNb: d.length,
            annotations: d,
          };
        }
        return {};
      })
      .value();

    return {
      documents,
      documentsUrls,
      otherDocuments,
    };
  },
)(DocumentsPage);