import React, { Component, createRef } from 'react';
import _ from 'underscore';
import './jquery_world';

/**
 * SearchButton widget.
 */
export class SearchButton extends Component {
    constructor(props) {
        super(props);
        this.state = {
            methods: [],
            hasQuery: false,
            hasDatabases: false,
            dropdownVisible: false,
        };
        this.inputGroup = this.inputGroup.bind(this);
        this.submitButton = this.submitButton.bind(this);
        this.initTooltip = this.initTooltip.bind(this);
        this.showTooltip = this.showTooltip.bind(this);
        this.hideTooltip = this.hideTooltip.bind(this);
        this.changeAlgorithm = this.changeAlgorithm.bind(this);
        this.decorate = this.decorate.bind(this);
        this.inputGroupRef = createRef();
        this.submitButtonRef = createRef();
    }
    componentDidMount() {
        this.initTooltip();
    }

    shouldComponentUpdate(props, state) {
        return !_.isEqual(state.methods, this.state.methods) || state.dropdownVisible !== this.state.dropdownVisible;
    }

    componentDidUpdate(_prevProps, prevState) {
        if (!_.isEqual(prevState.methods, this.state.methods)) {
            if (this.state.methods.length > 0) {
                this.inputGroup().wiggle();
                this.props.onAlgoChanged(this.state.methods[0]);
            } else {
                this.props.onAlgoChanged('');
            }
        }
    }
    // Internal helpers. //

    /**
 * Returns jquery wrapped input group.
 */
    inputGroup() {
        return $(this.inputGroupRef.current);
    }

    /**
 * Returns jquery wrapped submit button.
 */
    submitButton() {
        return $(this.submitButtonRef.current);
    }

    /**
 * Initialise tooltip on input group and submit button.
 */
    initTooltip() {
        this.inputGroup().tooltip({
            trigger: 'manual',
            title: _.bind(function () {
                if (!this.state.hasQuery && !this.state.hasDatabases) {
                    return 'You must enter a query sequence and select one or more databases above before you can run a search!';
                } else if (this.state.hasQuery && !this.state.hasDatabases) {
                    return 'You must select one or more databases above before you can run a search!';
                } else if (!this.state.hasQuery && this.state.hasDatabases) {
                    return 'You must enter a query sequence above before you can run a search!';
                }
            }, this),
        });

        this.submitButton().tooltip({
            title: _.bind(function () {
                var title = 'Click to BLAST or press Ctrl+Enter.';
                if (this.state.methods.length > 1) {
                    title +=
                        ' Click dropdown button on the right for other' +
                        ' BLAST algorithms that can be used.';
                }
                return title;
            }, this),
        });
    }

    /**
 * Show tooltip on input group.
 */
    showTooltip() {
        this.inputGroup()._tooltip('show');
    }

    /**
 * Hide tooltip on input group.
 */
    hideTooltip() {
        this.inputGroup()._tooltip('hide');
    }

    /**
 * Change selected algorithm.
 *
 * NOTE: Called on click on dropdown menu items.
 */
    changeAlgorithm(method) {
        var methods = this.state.methods.slice();
        methods.splice(methods.indexOf(method), 1);
        methods.unshift(method);
        this.setState({
            methods: methods,
            dropdownVisible: false,
        });
    }

    /**
 * Given, for example 'blastp', returns blast<strong>p</strong>.
 */
    decorate(name) {
        return name
            .match(/(.?)(blast)(.?)/)
            .slice(1)
            .map(function (token, _) {
                if (token) {
                    if (token !== 'blast') {
                        return <strong key={token}>{token}</strong>;
                    } else {
                        return token;
                    }
                }
            });
    }

    toggleDropdownVisibility = () => {
        this.setState(prevState => ({
            dropdownVisible: !prevState.dropdownVisible
        }));
    }

    render() {
        var methods = this.state.methods;
        var method = methods[0];
        var multi = methods.length > 1;

        return (
            <div
                // className={multi ? 'flex' : 'flex'}
                className="my-4 md:my-2 flex justify-end w-full md:w-auto relative"
                id="methods"
                ref={this.inputGroupRef}
                onMouseOver={this.showTooltip}
                onMouseOut={this.hideTooltip}
            >
                <button
                    type="submit"
                    className="uppercase w-full md:w-auto flex text-xl justify-center py-2 px-16 border border-transparent rounded-md shadow-sm text-white bg-seqblue hover:bg-seqorange focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-seqorange"
                    id="method"
                    ref={this.submitButtonRef}
                    name="method"
                    value={method}
                    disabled={!method}
                >
                    {this.decorate(method || 'blast')}
                </button>

                {multi && (
                    <div className="ui--multi-dropdown">
                        <button
                            className="text-xl bg-seqblue rounded-r-md text-white p-2 border border-seqblue hover:bg-seqorange focus:outline-none focus:ring-1 focus:ring-seqorange -ml-8"
                            type="button"
                            onClick={this.toggleDropdownVisibility}
                        >
                            <i className="fas fa-caret-down w-6 h-6 fill-current"></i>
                            <span className="sr-only">Other methods</span>
                        </button>

                        <div id="dropdown"
                            className={`z-10 my-2 uppercase bg-blue-300 divide-y divide-gray-100 rounded-lg shadow absolute left-0 bottom-12 w-full text-xl text-center ${this.state.dropdownVisible ? '' : 'hidden'}`}>
                            <ul className="text-gray-700" aria-labelledby="dropdownDefaultButton">
                                {_.map(
                                    methods.slice(1),
                                    _.bind(function (method) {
                                        return (
                                            <li
                                                key={method}
                                                onClick={_.bind(function () {
                                                    this.changeAlgorithm(method);
                                                }, this)}
                                            >
                                                <a href="#" className="block px-4 py-2 hover:bg-blue-400 rounded-lg">{method}</a>
                                            </li>
                                        );
                                    }, this)
                                )}
                            </ul>
                        </div>
                    </div>
                )}
            </div>
        );
    }
}