import { useCallback, useEffect, useState } from 'react';

type PaginatedResourceResponse<TItem> = {
    items: TItem[];
    page: number;
    pageSize: number;
    total: number;
    totalPages: number;
};

type UsePaginatedResourceOptions<TItem> = {
    load: (params: {
        q: string;
        page: number;
        pageSize: number;
        sort?: string;
    }) => Promise<PaginatedResourceResponse<TItem>>;
    sort?: string;
    debounceMs?: number;
    initialQuery?: string;
    initialPage?: number;
    initialPageSize?: number;
};

export function usePaginatedResource<TItem>({
    load,
    sort,
    debounceMs = 250,
    initialQuery = '',
    initialPage = 1,
    initialPageSize = 10,
}: UsePaginatedResourceOptions<TItem>) {
    const [items, setItems] = useState<TItem[]>([]);
    const [q, setQ] = useState(initialQuery);
    const [page, setPage] = useState(initialPage);
    const [pageSize, setPageSize] = useState(initialPageSize);
    const [total, setTotal] = useState(0);
    const [totalPages, setTotalPages] = useState(0);
    const [error, setError] = useState<string | null>(null);
    const [isLoading, setIsLoading] = useState(true);

    useEffect(() => {
        let cancelled = false;
        setIsLoading(true);
        setError(null);

        const timer = setTimeout(() => {
            void (async () => {
                try {
                    const response = await load({
                        q,
                        page,
                        pageSize,
                        sort,
                    });

                    if (cancelled) {
                        return;
                    }

                    setItems(response.items);
                    setTotal(response.total);
                    setTotalPages(response.totalPages);
                    setPage(response.page);
                    setPageSize(response.pageSize);
                } catch (err) {
                    if (!cancelled) {
                        setError(
                            err instanceof Error
                                ? err.message
                                : 'Request failed. Please try again.',
                        );
                    }
                } finally {
                    if (!cancelled) {
                        setIsLoading(false);
                    }
                }
            })();
        }, debounceMs);

        return () => {
            cancelled = true;
            clearTimeout(timer);
        };
    }, [q, page, pageSize, sort, load, debounceMs]);

    const setQuery = useCallback((value: string) => {
        setQ(value);
        setPage(1);
    }, []);

    const setPageSizeAndResetPage = useCallback((value: number) => {
        setPageSize(value);
        setPage(1);
    }, []);

    return {
        items,
        q,
        page,
        pageSize,
        total,
        totalPages,
        error,
        isLoading,
        setQuery,
        setPage,
        setPageSize: setPageSizeAndResetPage,
    };
}