import BaseUIElement from "../BaseUIElement"
import { UIEventSource } from "../../Logic/UIEventSource"
import { VariableUiElement } from "./VariableUIElement"
import Combine from "./Combine"
import Locale from "../i18n/Locale"
import { Utils } from "../../Utils"

export default class FilteredCombine extends VariableUiElement {
    /**
     * Only shows item matching the search
     * If predicate of an item is undefined, it will be filtered out as soon as a non-null or non-empty search term is given
     * @param entries
     * @param searchedValue
     * @param options
     */
    constructor(
        entries: {
            element: BaseUIElement | string
            predicate?: (s: string) => boolean
        }[],
        searchedValue: UIEventSource<string>,
        options?: {
            onEmpty?: BaseUIElement | string
            innerClasses: string
        }
    ) {
        entries = Utils.NoNull(entries)
        super(
            searchedValue.map(
                (searchTerm) => {
                    if (searchTerm === undefined || searchTerm === "") {
                        return new Combine(entries.map((e) => e.element)).SetClass(
                            options?.innerClasses ?? ""
                        )
                    }
                    const kept = entries.filter(
                        (entry) => entry?.predicate !== undefined && entry.predicate(searchTerm)
                    )
                    if (kept.length === 0) {
                        return options?.onEmpty
                    }
                    return new Combine(kept.map((entry) => entry.element)).SetClass(
                        options?.innerClasses ?? ""
                    )
                },
                [Locale.language]
            )
        )
    }
}