import { computed } from "mobx";
import { observer } from "mobx-react";
import * as React from "react";
import { Doc, DocListCast } from "../../fields/Doc";
import { Cast } from "../../fields/Types";
import { DocumentType } from "../documents/DocumentTypes";
import { LinkManager } from "../util/LinkManager";
import { SelectionManager } from "../util/SelectionManager";
import { LinkMenu } from "./linking/LinkMenu";
import './PropertiesDocBacklinksSelector.scss';

type PropertiesDocBacklinksSelectorProps = {
    Document: Doc,
    Stack?: any,
    hideTitle?: boolean,
    addDocTab(doc: Doc, location: string): void
};

@observer
export class PropertiesDocBacklinksSelector extends React.Component<PropertiesDocBacklinksSelectorProps> {
    @computed get _docs() {
        const linkSource = this.props.Document;
        const links = DocListCast(linkSource.links);
        const collectedLinks = [] as Doc[];
        links.map(link => {
            const other = LinkManager.getOppositeAnchor(link, linkSource);
            const otherdoc = !other ? undefined : other.annotationOn && other.type !== DocumentType.RTF ? Cast(other.annotationOn, Doc, null) : other;
            if (otherdoc && !collectedLinks.some(d => Doc.AreProtosEqual(d, otherdoc))) {
                collectedLinks.push(otherdoc);
            }
        });
        return collectedLinks;
    }

    getOnClick = (link: Doc) => {
        const linkSource = this.props.Document;
        const other = LinkManager.getOppositeAnchor(link, linkSource);
        const otherdoc = !other ? undefined : other.annotationOn && other.type !== DocumentType.RTF ? Cast(other.annotationOn, Doc, null) : other;

        if (otherdoc) {
            this.props.addDocTab(Doc.IsPrototype(otherdoc) ? Doc.MakeDelegate(otherdoc) : otherdoc, "toggle:right");
        }
    }

    render() {
        return !SelectionManager.Views().length ? (null) : <div>
            {this.props.hideTitle ? (null) : <p key="contexts">Contexts:</p>}
            <LinkMenu docView={SelectionManager.Views().lastElement()} itemHandler={this.getOnClick} position={{ x: 0 }} />
        </div>;
    }
}