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// SPDX-FileCopyrightText: 2024 Shota FUJI <pockawoooh@gmail.com>
// SPDX-License-Identifier: AGPL-3.0-only

import {
	type DescMessage,
	type MessageInitShape,
	type MessageShape,
	create,
	toBinary,
	fromBinary,
} from "@bufbuild/protobuf";
import {
	type QueryClientConfig,
	QueryClient,
	QueryClientProvider,
	type MutationOptions,
	type UseMutationResult,
	useMutation,
	type QueryOptions,
	type UseQueryResult,
	useQuery,
} from "@tanstack/react-query";
import { createContext, type FC, type ReactNode, use, useState } from "react";

export interface ProtoRPC {
	send(service: string, method: string, data: Uint8Array): Promise<Uint8Array>;
}

const Context = createContext<ProtoRPC | null>(null);

export interface ProtoRPCProviderProps {
	children: ReactNode;

	rpc: ProtoRPC;

	config?: QueryClientConfig;
}

export const ProtoRPCProvider: FC<ProtoRPCProviderProps> = ({
	children,
	rpc,
	config,
}) => {
	const [queryClient] = useState(() => new QueryClient(config));

	return (
		<Context.Provider value={rpc}>
			<QueryClientProvider client={queryClient}>{children}</QueryClientProvider>
		</Context.Provider>
	);
};

export function useRPC(): ProtoRPC {
	const rpc = use(Context);
	if (!rpc) {
		throw new Error("`useService` MUST be called inside `ServiceProvider`");
	}

	return rpc;
}

export interface UseMethodQueryParams<
	Request extends DescMessage,
	Response extends DescMessage,
	Output = MessageShape<Response>,
> {
	readonly service: string;
	readonly method: string;

	readonly request: {
		readonly schema: Request;
		readonly data: MessageInitShape<Request>;
	};

	readonly response: {
		readonly schema: Response;
	};

	mapResponse?(response: MessageShape<Response>): Output;

	readonly options?: Omit<QueryOptions<Output>, "queryKey" | "queryFn">;
}

export function useMethodQuery<
	Request extends DescMessage,
	Response extends DescMessage,
	Output = MessageShape<Response>,
>({
	service,
	method,
	request,
	response,
	mapResponse,
	options,
}: UseMethodQueryParams<Request, Response, Output>): UseQueryResult<Output, unknown> {
	const rpc = useRPC();

	return useQuery({
		...options,
		queryKey: [service, method, request.data],
		async queryFn() {
			const received = await rpc.send(
				service,
				method,
				toBinary(request.schema, create(request.schema, request.data)),
			);

			const resp = fromBinary(response.schema, received);

			if (mapResponse) {
				return mapResponse(resp);
			}

			return resp as Output;
		},
	});
}

export interface UseMethodMutationParams<
	Request extends DescMessage,
	Response extends DescMessage,
	Output = MessageShape<Response>,
> {
	readonly service: string;
	readonly method: string;

	readonly request: {
		readonly schema: Request;
	};

	readonly response: {
		readonly schema: Response;
	};

	mapResponse?(response: MessageShape<Response>): Output;

	readonly options?: Omit<
		MutationOptions<Output, unknown, MessageInitShape<Request>>,
		"mutationFn"
	>;
}

export function useMethodMutation<
	Request extends DescMessage,
	Response extends DescMessage,
	Output = MessageShape<Response>,
>({
	service,
	method,
	request,
	response,
	mapResponse,
	options,
}: UseMethodMutationParams<Request, Response, Output>): UseMutationResult<
	Output,
	unknown,
	MessageInitShape<Request>
> {
	const rpc = useRPC();

	return useMutation({
		...options,
		async mutationFn(req) {
			const received = await rpc.send(
				service,
				method,
				toBinary(request.schema, create(request.schema, req)),
			);

			const resp = fromBinary(response.schema, received);

			if (mapResponse) {
				return mapResponse(resp);
			}

			return resp as Output;
		},
	});
}