MapComplete/Logic/Actors/TitleHandler.ts

import { Store, UIEventSource } from "../UIEventSource"
import Locale from "../../UI/i18n/Locale"
import TagRenderingAnswer from "../../UI/Popup/TagRenderingAnswer"
import Combine from "../../UI/Base/Combine"
import LayoutConfig from "../../Models/ThemeConfig/LayoutConfig"
import { ElementStorage } from "../ElementStorage"
import { Utils } from "../../Utils"

export default class TitleHandler {
    constructor(state: {
        selectedElement: Store<any>
        layoutToUse: LayoutConfig
        allElements: ElementStorage
    }) {
        const currentTitle: Store<string> = state.selectedElement.map(
            (selected) => {
                const layout = state.layoutToUse
                const defaultTitle = layout?.title?.txt ?? "MapComplete"

                if (selected === undefined) {
                    return defaultTitle
                }

                const tags = selected.properties
                for (const layer of layout.layers) {
                    if (layer.title === undefined) {
                        continue
                    }
                    if (layer.source.osmTags.matchesProperties(tags)) {
                        const tagsSource =
                            state.allElements.getEventSourceById(tags.id) ??
                            new UIEventSource<any>(tags)
                        const title = new TagRenderingAnswer(tagsSource, layer.title, {})
                        return (
                            new Combine([defaultTitle, " | ", title]).ConstructElement()
                                ?.textContent ?? defaultTitle
                        )
                    }
                }
                return defaultTitle
            },
            [Locale.language]
        )

        currentTitle.addCallbackAndRunD((title) => {
            if (Utils.runningFromConsole) {
                return
            }
            document.title = title
        })
    }
}