import { observer } from "mobx-react";
import './LinkEditor.scss';
import React = require("react");

interface LinkRelationshipSearchProps {
    results: string[] | undefined;
    display: string;
    //callback fn to set rel + hide dropdown upon setting
    handleRelationshipSearchChange: (result: string) => void;
    toggleSearch: () => void;
}
@observer
export class LinkRelationshipSearch extends React.Component<LinkRelationshipSearchProps> {

    handleResultClick = (e: React.MouseEvent) => {
        const relationship = (e.target as HTMLParagraphElement).textContent;
        if (relationship) {
            this.props.handleRelationshipSearchChange(relationship);
        }
    }

    handleMouseEnter = () => {
        this.props.toggleSearch();
    }

    handleMouseLeave = () => {
        this.props.toggleSearch();
    }

    /**
     * Render an empty div to increase the height of LinkEditor to accommodate 2+ results 
    */
    emptyDiv = () => {
        if (this.props.results && this.props.results.length > 2 && this.props.display === "block") {
            return <div style={{ height: "50px" }} />;
        }
    }

    render() {
        return (
            <div className="linkEditor-relationship-dropdown-container">
                <div className="linkEditor-relationship-dropdown"
                    style={{ display: this.props.display }}
                    onMouseEnter={this.handleMouseEnter}
                    onMouseLeave={this.handleMouseLeave}
                >
                    {   // return a dropdown of relationship results if there exist results
                        this.props.results
                            ? this.props.results.map(result => {
                                return <p key={result} onClick={this.handleResultClick}>
                                    {result}
                                </p>;
                            })
                            : <p>No matching relationships</p>
                    }
                </div>

                {/*Render an empty div to increase the height of LinkEditor to accommodate 2+ results */}
                {this.emptyDiv()}
            </div>
        );
    }
}