import './jquery_world'; // for custom $.tooltip function
import React, { Component } from 'react';
import _ from 'underscore';

import Sidebar from './sidebar';
import Hits from './hits';
import Circos from './circos';
import AlignmentExporter from './alignment_exporter';
import ReportPlugins from 'report_plugins';

/**
 * Renders entire report.
 *
 * Composed of Query and Sidebar components.
 */

class Report extends Component {
    constructor(props) {
        super(props);
        // Properties below are internal state used to render results in small
        // slices (see updateState).
        this.state = {
            user_warning: null,
            download_links: [],
            search_id: '',
            seqserv_version: '',
            program: '',
            program_version: '',
            submitted_at: '',
            results: [],
            queries: [],
            querydb: [],
            params: [],
            stats: [],
            alignment_blob_url: '',
            allQueriesLoaded: false,
            cloud_sharing_enabled: false,
        };
        this.prepareAlignmentOfAllHits = this.prepareAlignmentOfAllHits.bind(this);
        this.setStateFromJSON = this.setStateFromJSON.bind(this);
        this.plugins = new ReportPlugins(this);
    }

    /**
   * Fetch results.
   */
    fetchResults() {
        const path = location.pathname + '.json' + location.search;
        this.pollPeriodically(path, this.setStateFromJSON, this.props.showErrorModal);
    }

    pollPeriodically(path, callback, errCallback) {
    var intervals = [200, 400, 800, 1200, 2000, 3000, 5000];
        function poll() {
            fetch(path)
                .then(response => {
                    // Handle HTTP status codes
                    if (!response.ok) throw response;

                    return response.text().then(data => {
                        if (data) {
                            data = parseJSON(data);
                        };
                        return { status: response.status, data }
                    });
                })
                .then(({ status, data }) => {
                    switch (status) {
                        case 202:
                            var interval;
                            if (intervals.length === 1) {
                                interval = intervals[0];
                            } else {
                                interval = intervals.shift();
                            }
                            setTimeout(poll, interval);
                            break;
                        case 200:
                            callback(data);
                            break;
                    }
                })
                .catch(error => {
                    if (error.text) {
                        error.text().then(errData => {
                            errData = parseJSON(errData);
                            switch (error.status) {
                                case 400:
                                case 422:
                                case 500:
                                    errCallback(errData);
                                    break;
                                default:
                                    console.error("Unhandled error:", error.status);
                            }
                        });
                    } else {
                        console.error("Network error:", error);
                    }
                });
        }

        function parseJSON(str) {
            let parsedJson = str;
            try {
                parsedJson = JSON.parse(str);
            } catch (e) {
                console.error("Error parsing JSON:", e);
            }

            return parsedJson;
        }
        poll();
    }

    /**
   * Calls setState after any required modification to responseJSON.
   */
    setStateFromJSON(responseJSON) {
        this.lastTimeStamp = Date.now();
        // the callback prepares the download link for all alignments
        if (responseJSON.user_warning == 'LARGE_RESULT') {
            this.setState({user_warning: responseJSON.user_warning, download_links: responseJSON.download_links});
        } else {
            this.setState(responseJSON, this.prepareAlignmentOfAllHits);
        }
    }

    /**
   * Called as soon as the page has loaded and the user sees the loading spinner.
   * We use this opportunity to setup services that make use of delegated events
   * bound to the window, document, or body.
   */
    componentDidMount() {
        this.fetchResults();
        this.plugins.init();
        // This sets up an event handler which enables users to select text from
        // hit header without collapsing the hit.
        this.preventCollapseOnSelection();
        this.toggleTable();
    }

    /**
   * Called after all results have been rendered.
   */
    componentFinishedUpdating() {
        if (this.state.allQueriesLoaded) return;
        this.shouldShowIndex() && this.setupScrollSpy();
        this.setState({ allQueriesLoaded: true });
    }

    /**
   * Returns loading message
   */
    loadingJSX() {
        return (
            <div className="row">
                <div className="col-md-6 col-md-offset-3 text-center">
                    <h1>
                        <i className="fa fa-cog fa-spin"></i>&nbsp; BLAST-ing
                    </h1>
                    <p>
                        <br />
            This can take some time depending on the size of your query and
            database(s). The page will update automatically when BLAST is done.
                        <br />
                        <br />
            You can bookmark the page and come back to it later or share the
            link with someone.
                        <br />
                        <br />
                        { process.env.targetEnv === 'cloud' && <b>If the job takes more than 10 minutes to complete, we will send you an email upon completion.</b> }
                    </p>
                </div>
            </div>
        );
    }

    /* eslint-disable */
    /**
   * Return results JSX.
   */
    resultsJSX() {
        return (
            <div className="row" id="results">
                <div className="col-md-3 hidden-sm hidden-xs">
                    <Sidebar
                        data={this.state}
                        atLeastOneHit={this.atLeastOneHit()}
                        shouldShowIndex={this.shouldShowIndex()}
                        allQueriesLoaded={this.state.allQueriesLoaded}
                        cloudSharingEnabled={this.state.cloud_sharing_enabled}
                    />
                </div>
                <div className="col-md-9">
                    {this.overviewJSX()}
                    {this.circosJSX()}
                    {this.plugins.generateStats(this.state.queries)}
                    {this.state.results}
                    <Hits
                        state={this.state}
                        componentFinishedUpdating={(_) => this.componentFinishedUpdating(_)}
                        populate_hsp_array={this.populate_hsp_array.bind(this)}
                        plugins={this.plugins}
                        {...this.props}
                    />
                </div>
            </div>
        );
    }
    /* eslint-enable */


    warningJSX() {
        return(
            <div className="container">
                <div className="row">
                    <div className="col-md-6 col-md-offset-3 text-center">
                        <h1>
                            <i className="fa fa-exclamation-triangle"></i>&nbsp; Warning
                        </h1>
                        <p>
                            <br />
                            The BLAST result might be too large to load in the browser. If you have a powerful machine you can try loading the results anyway. Otherwise, you can download the results and view them locally.
                        </p>
                        <br />
                        <p>
                            {this.state.download_links.map((link, index) => {
                                return (
                                    <a href={link.url} className="btn btn-secondary" key={'download_link_' + index} >
                                        {link.name}
                                    </a>
                                );
                            })}
                        </p>
                        <br />
                        <p>
                            <a href={location.pathname + '?bypass_file_size_warning=true'} className="btn btn-primary">
                                View results in browser anyway
                            </a>
                        </p>
                    </div>
                </div>
            </div>
        );
    }
    /**
   * Renders report overview.
   */
    overviewJSX() {
        return (
            <div className="overview">
                <p>
                    <strong>SequenceServer {this.state.seqserv_version}</strong> using{' '}
                    <strong>{this.state.program_version}</strong>
                    {this.state.submitted_at &&
            `, query submitted on ${this.state.submitted_at}`}
                </p>
                <p>
                    <strong> Databases: </strong>
                    {this.state.querydb
                        .map((db) => {
                            return db.title;
                        })
                        .join(', ')}{' '}
          ({this.state.stats.nsequences} sequences,&nbsp;
                    {this.state.stats.ncharacters} characters)
                </p>
                <p>
                    <strong>Parameters: </strong>{' '}
                    {_.map(this.state.params, function (val, key) {
                        return key + ' ' + val;
                    }).join(', ')}
                </p>
                <p>
          Please cite:{' '}
                    <a href="https://doi.org/10.1093/molbev/msz185">
            https://doi.org/10.1093/molbev/msz185
                    </a>
                </p>
            </div>
        );
    }

    /**
   * Return JSX for circos if we have at least one hit.
   */
    circosJSX() {
        return this.atLeastTwoHits() ? (
            <Circos
                queries={this.state.queries}
                program={this.state.program}
            />
        ) : (
            <span></span>
        );
    }

    // Controller //

    /**
   * Returns true if results have been fetched.
   *
   * A holding message is shown till results are fetched.
   */
    isResultAvailable() {
        return this.state.queries.length >= 1;
    }

    /**
     * Indicates the response contains a warning message for the user
     * in which case we should not render the results and render the
     * warning instead.
     **/
    isUserWarningPresent() {
        return this.state.user_warning;
    }

    /**
   * Returns true if we have at least one hit.
   */
    atLeastOneHit() {
        return this.state.queries.some((query) => query.hits.length > 0);
    }

    /**
   * Does the report have at least two hits? This is used to determine
   * whether Circos should be enabled or not.
   */
    atLeastTwoHits() {
        var hit_num = 0;
        return this.state.queries.some((query) => {
            hit_num += query.hits.length;
            return hit_num > 1;
        });
    }

    /**
   * Returns true if index should be shown in the sidebar. Index is shown
   * only for 2 and 8 queries.
   */
    shouldShowIndex() {
        var num_queries = this.state.queries.length;
        return num_queries >= 2 && num_queries <= 12;
    }

    /**
   * Prevents folding of hits during text-selection.
   */
    preventCollapseOnSelection() {
        $('body').on('mousedown', '.hit > .section-header > h4', function (event) {
            var $this = $(this);
            $this.on('mouseup mousemove', function handler(event) {
                if (event.type === 'mouseup') {
                    // user wants to toggle
                    var hitID = $this.parents('.hit').attr('id');
                    $(`div[data-parent-hit=${hitID}]`).toggle();
                    $this.find('i').toggleClass('fa-minus-square-o fa-plus-square-o');
                } else {
                    // user wants to select
                    $this.attr('data-toggle', '');
                }
                $this.off('mouseup mousemove', handler);
            });
        });
    }

    /* Handling the fa icon when Hit Table is collapsed */
    toggleTable() {
        $('body').on(
            'mousedown',
            '.resultn .caption[data-toggle="collapse"]',
            function (event) {
                var $this = $(this);
                $this.on('mouseup mousemove', function handler(event) {
                    $this.find('i').toggleClass('fa-minus-square-o fa-plus-square-o');
                    $this.off('mouseup mousemove', handler);
                });
            }
        );
    }



    /**
   * For the query in viewport, highlights corresponding entry in the index.
   */
    setupScrollSpy() {
        $('body').scrollspy({ target: '.sidebar' });
    }

    populate_hsp_array(hit, query_id){
        return hit.hsps.map(hsp => Object.assign(hsp, {hit_id: hit.id, query_id}));
    }

    prepareAlignmentOfAllHits() {
        // Get number of hits and array of all hsps.
        var num_hits = 0;
        var hsps_arr = [];
        if(!this.state.queries.length){
            return;
        }
        this.state.queries.forEach(
            (query) => query.hits.forEach(
                (hit) => {
                    num_hits++;
                    hsps_arr = hsps_arr.concat(this.populate_hsp_array(hit, query.id));
                }
            )
        );

        var aln_exporter = new AlignmentExporter();
        var file_name = `alignment-${num_hits}_hits.txt`;
        const blob_url = aln_exporter.prepare_alignments_for_export(hsps_arr, file_name);
        $('.download-alignment-of-all')
            .attr('href', blob_url)
            .attr('download', file_name);
        return false;
    }

    render() {
        if (this.isUserWarningPresent()) {
            return this.warningJSX();
        } else if (this.isResultAvailable()) {
            return this.resultsJSX();
        } else {
            return this.loadingJSX();
        }
    }
}

export default Report;