import { type MaybeRefOrGetter, toValue } from "vue";
import type { Language } from "@/data-objects/language.ts";
import { useQuery, type UseQueryReturnType } from "@tanstack/vue-query";
import { getLearningObjectController } from "@/controllers/controllers.ts";
import type { LearningObject } from "@/data-objects/learning-objects/learning-object.ts";
import type { LearningPath } from "@/data-objects/learning-paths/learning-path.ts";

export const LEARNING_OBJECT_KEY = "learningObject";
const learningObjectController = getLearningObjectController();

export function useLearningObjectMetadataQuery(
    hruid: MaybeRefOrGetter<string>,
    language: MaybeRefOrGetter<Language>,
    version: MaybeRefOrGetter<number>,
): UseQueryReturnType<LearningObject, Error> {
    return useQuery({
        queryKey: [LEARNING_OBJECT_KEY, "metadata", hruid, language, version],
        queryFn: async () => {
            const [hruidVal, languageVal, versionVal] = [toValue(hruid), toValue(language), toValue(version)];
            return learningObjectController.getMetadata(hruidVal, languageVal, versionVal);
        },
        enabled: () => Boolean(toValue(hruid)) && Boolean(toValue(language)) && Boolean(toValue(version)),
    });
}

export function useLearningObjectHTMLQuery(
    hruid: MaybeRefOrGetter<string>,
    language: MaybeRefOrGetter<Language>,
    version: MaybeRefOrGetter<number>,
): UseQueryReturnType<Document, Error> {
    return useQuery({
        queryKey: [LEARNING_OBJECT_KEY, "html", hruid, language, version],
        queryFn: async () => {
            const [hruidVal, languageVal, versionVal] = [toValue(hruid), toValue(language), toValue(version)];
            return learningObjectController.getHTML(hruidVal, languageVal, versionVal);
        },
        enabled: () => Boolean(toValue(hruid)) && Boolean(toValue(language)) && Boolean(toValue(version)),
    });
}

export function useLearningObjectListForPathQuery(
    learningPath: MaybeRefOrGetter<LearningPath | undefined>,
): UseQueryReturnType<LearningObject[], Error> {
    return useQuery({
        queryKey: [LEARNING_OBJECT_KEY, "onPath", learningPath],
        queryFn: async () => {
            const learningObjects: Promise<LearningObject>[] = [];
            for (const node of toValue(learningPath)!.nodesAsList) {
                learningObjects.push(
                    learningObjectController.getMetadata(node.learningobjectHruid, node.language, node.version),
                );
            }
            return Promise.all(learningObjects);
        },
        enabled: () => Boolean(toValue(learningPath)),
    });
}