// eslint-disable-next-line import/no-extraneous-dependencies
import { writable, derived } from 'svelte/store';
import type { HOVER_COLUMN_KEY } from './constants';

const defaultLocale = navigator.language;

export const locale = writable<string>(defaultLocale);
export const debugWarnings = writable<boolean>(false);

export const createStickyStores = () => {
    const newOffsetMap = () => new Map<string | typeof HOVER_COLUMN_KEY, number>();

    const createWidths = () => {
        const { update, set, subscribe } = writable(newOffsetMap());
        return {
            updateColumn: (key: string | typeof HOVER_COLUMN_KEY, width: number) =>
                update(($widths) => {
                    $widths.set(key, width);
                    return $widths;
                }),
            reset: () => set(newOffsetMap()),
            subscribe,
        };
    };
    const stickyColumnsWidth = createWidths();

    const stickyColumnsOffset = derived(stickyColumnsWidth, ($widths) => {
        const cumulativeWidths = newOffsetMap();
        let cumulativeOffset = 0;

        Array.from($widths).forEach(([key, clientWidth]) => {
            cumulativeWidths.set(key, cumulativeOffset);
            cumulativeOffset += clientWidth + 1;
        });

        return cumulativeWidths;
    });

    const lastStickyColumn = derived(stickyColumnsWidth, ($widths) => [...$widths.keys()].at(-1));

    const isHorizontallyScrolled = writable(false);

    return {
        stickyColumnsOffset,
        stickyColumnsWidth,
        lastStickyColumn,
        isHorizontallyScrolled,
    };
};