import { action, observable } from "mobx";
import { observer } from "mobx-react";
import { DocumentView } from "../nodes/DocumentView";
import { LinkEditor } from "./LinkEditor";
import './LinkMenu.scss';
import React = require("react");
import { Doc, Opt } from "../../../fields/Doc";
import { LinkManager } from "../../util/LinkManager";
import { LinkMenuGroup } from "./LinkMenuGroup";
import { faTrash } from '@fortawesome/free-solid-svg-icons';
import { library } from "@fortawesome/fontawesome-svg-core";
import { DocumentLinksButton } from "../nodes/DocumentLinksButton";

library.add(faTrash);

interface Props {
    docView: DocumentView;
    changeFlyout: () => void;
    addDocTab: (document: Doc, where: string) => boolean;
    location: number[];
}

@observer
export class LinkMenu extends React.Component<Props> {

    @observable private _editingLink?: Doc;
    @observable private _linkMenuRef: Opt<HTMLDivElement | null>;

    @action
    onClick = (e: PointerEvent) => {
        if (!Array.from(this._linkMenuRef?.getElementsByTagName((e.target as HTMLElement).tagName) || []).includes(e.target as any)) {
            DocumentLinksButton.EditLink = undefined;
        }
    }
    @action
    componentDidMount() {
        this._editingLink = undefined;
        document.addEventListener("pointerdown", this.onClick);
    }

    componentWillUnmount() {
        document.removeEventListener("pointerdown", this.onClick);
    }

    clearAllLinks = () => {
        LinkManager.Instance.deleteAllLinksOnAnchor(this.props.docView.props.Document);
    }

    renderAllGroups = (groups: Map<string, Array<Doc>>): Array<JSX.Element> => {
        const linkItems: Array<JSX.Element> = [];
        groups.forEach((group, groupType) => {
            linkItems.push(
                <LinkMenuGroup
                    key={groupType}
                    docView={this.props.docView}
                    sourceDoc={this.props.docView.props.Document}
                    group={group}
                    groupType={groupType}
                    showEditor={action((linkDoc: Doc) => this._editingLink = linkDoc)}
                    addDocTab={this.props.addDocTab} />
            );
        });

        // if source doc has no links push message
        if (linkItems.length === 0) linkItems.push(<p key="">No links have been created yet. Drag the linking button onto another document to create a link.</p>);

        return linkItems;
    }

    render() {
        const sourceDoc = this.props.docView.props.Document;
        const groups: Map<string, Doc[]> = LinkManager.Instance.getRelatedGroupedLinks(sourceDoc);
        return <div className="linkMenu-list" ref={(r) => this._linkMenuRef = r} style={{ left: this.props.location[0], top: this.props.location[1] }}>
            {!this._editingLink ?
                this.renderAllGroups(groups) :
                <LinkEditor sourceDoc={this.props.docView.props.Document} linkDoc={this._editingLink} showLinks={action(() => this._editingLink = undefined)} />
            }
        </div>;
    }
}