import React from "react";
import { useDataProvider, useResource, BaseKey } from "@refinedev/core";

import { pickDataProvider, dataProviderFromResource } from "../utilities";
import { InferencerComponentProps } from "../types";
import { pickMeta } from "../utilities/get-meta-props";

/**
 * This hook will handle the data fetching for the inferencer with `loading` and `initial` states.
 * Data provider functions will be used respectively for the `list`, `show` and `edit` types.
 */
export const useInferFetch = (
    type: "list" | "show" | "edit" | "create",
    resourceNameOrRouteName?: string,
    idFromProps?: string | number,
    meta?: InferencerComponentProps["meta"],
) => {
    const {
        resource,
        id: idFromURL,
        resources,
    } = useResource(resourceNameOrRouteName);

    const id = idFromProps ?? idFromURL;

    const dataProvider = useDataProvider();

    const [error, setError] = React.useState<string | undefined>(undefined);

    const [data, setData] = React.useState<Record<string, unknown> | undefined>(
        undefined,
    );
    const [datas, setDatas] = React.useState<
        Array<Record<string, unknown>> | undefined
    >(undefined);
    const [initial, setInitial] = React.useState<boolean>(true);
    const [loading, setLoading] = React.useState<boolean>(false);

    const resolver = React.useCallback(
        async (recordItemId: BaseKey | undefined) => {
            const dataProviderName =
                dataProviderFromResource(resource) ??
                pickDataProvider(resource?.name, undefined, resources);
            const dp = dataProvider(dataProviderName);

            setLoading(true);
            setError(undefined);

            try {
                if (type === "list" || type === "create") {
                    if (resource) {
                        const response = await dp.getList({
                            resource: resource?.name,
                            meta: pickMeta(
                                resource?.identifier ?? resource?.name,
                                meta,
                                ["getList"],
                            ),
                        });
                        const r = response.data?.[0];

                        if (!r) {
                            setError(
                                `<p>No records/data found for resource "${resource?.name}".</p>
                            <p>Please check your data provider and resource.</p>
                            <p>For more info, please check the <a href="https://refine.dev/docs/packages/documentation/inferencer/" target="_blank">documentation</a>.</p>`,
                            );
                        }
                        setData(r);
                        setDatas(response.data);
                        setTimeout(() => {
                            setLoading(false);
                        }, 500);
                    }
                }
                if ((type === "edit" || type === "show") && recordItemId) {
                    if (resource) {
                        const response = await dp.getOne({
                            resource: resource?.name,
                            id: recordItemId,
                            meta: pickMeta(
                                resource?.identifier ?? resource?.name,
                                meta,
                                ["getOne"],
                            ),
                        });
                        const r = response.data;
                        if (!r) {
                            setError(
                                `<p>No records/data found for resource "${resource?.name}".</p>
                            <p>Please check your data provider and resource.</p>
                            <p>For more info, please check the <a href="https://refine.dev/docs/packages/documentation/inferencer/" target="_blank">documentation</a>.</p>`,
                            );
                        }
                        setData(r);
                        setTimeout(() => {
                            setLoading(false);
                        }, 500);
                    }
                }
            } catch (error) {
                console.warn(
                    "An error occured while fetching the resource data. Please check the error message below:",
                    error,
                );
                setError(
                    `<p>Something went wrong while fetching the resource data.</p>
                    <p>Please check your data provider and API for resource "${resource?.name}".</p>
                    <p>For more info, please check the <a href="https://refine.dev/docs/packages/documentation/inferencer/" target="_blank">documentation</a>.</p>`,
                );
                setTimeout(() => {
                    setLoading(false);
                }, 500);
            }
        },
        [type, dataProvider, resource, resources],
    );

    React.useEffect(() => {
        setInitial(false);
        if (!loading && !data) {
            resolver(id);
        }
    }, [resolver, id]);

    return {
        data,
        datas,
        loading,
        initial,
        error,
    };
};