import React from "react";

/** @ts-expect-error Docusaurus and Typescript doesn't play well together. */
import data from "@checklists/tutorial-checklist-data.json";
import { TutorialChecklistContext } from "../context/TutorialChecklistContext";

type TutorialChecklist = {
    id: string;
    unit: string;
    title: string;
    checklist: Array<{ id: string; index: number }>;
};

type TutorialChecklistData = {
    items: Array<TutorialChecklist>;
};

type MergedTutorialChecklist = Omit<TutorialChecklist, "checklist"> & {
    checklist: Array<{
        id: string;
        checked: boolean;
    }>;
};

export const getTutorialsByUnit = (
    unit: string,
    items: MergedTutorialChecklist[],
) => {
    return items.filter((item) => item.unit === unit);
};

export const getTutorialChecklistById = (
    id: string,
    items: MergedTutorialChecklist[],
) => {
    return items.find((item) => item.id === id);
};

export const isTutorialChecklistComplete = (
    id: string,
    items: MergedTutorialChecklist[],
) => {
    const item = getTutorialChecklistById(id, items);

    if (!item) {
        return false;
    }

    return item.checklist.every((checklistItem) => checklistItem.checked);
};

export function useTutorialChecklists() {
    const { store, toggle } = React.useContext(TutorialChecklistContext);

    const merged = React.useMemo(() => {
        return (
            (data as TutorialChecklistData)?.items.map((item) => {
                const { id } = item;

                return {
                    ...item,
                    checklist: item.checklist
                        .map((checklistItem) => {
                            return {
                                ...checklistItem,
                                checked: store[id]?.[checklistItem.id] ?? false,
                            };
                        })
                        .sort((a, b) => a.index - b.index),
                };
            }) ?? []
        );
    }, [store]);

    return {
        items: merged,
        toggle,
    };
}