import { dispatchRequest } from "./request";
import { storageImpl } from "./storage";
import { EnqueueResult, QueueStatus } from "./types";
import { ensureAppIdFormat, isUUIDv4, isValidUrl } from "./utils";

/**
 * The function input and other configuration when running
 * the function, such as the HTTP method to use.
 */
type RunOptions<Input> = {
	/**
	 * The path to the function, if any. Defaults to ``.
	 * @deprecated Pass the path as part of the app id itself, e.g.
	 */
	readonly path?: string;

	/**
	 * The function input. It will be submitted either as query params
	 * or the body payload, depending on the `method`.
	 */
	readonly input?: Input;

	/**
	 * The HTTP method, defaults to `post`;
	 */
	readonly method?: "get" | "post" | "put" | "delete" | string;

	/**
	 * If `true`, the function will automatically upload any files
	 * (i.e. instances of `Blob`) or data:uri in the input.
	 *
	 * You can disable this behavior by setting it to `false`, which
	 * is useful in cases where you want to upload the files yourself
	 * or use small data:uri in the input.
	 */
	readonly autoUpload?: boolean;
};

type ExtraOptions = {
	/**
	 * If `true`, the function will use the queue to run the function
	 * asynchronously and return the result in a separate call. This
	 * influences how the URL is built.
	 */
	readonly subdomain?: string;
};

/**
 * Builds the final url to run the function based on its `id` or alias and
 * a the options from `RunOptions<Input>`.
 *
 * @private
 * @param id the function id or alias
 * @param options the run options
 * @returns the final url to run the function
 */
export function buildUrl<Input>(
	id: string,
	options: RunOptions<Input> & ExtraOptions = {},
): string {
	const method = (options.method ?? "post").toLowerCase();
	const path = (options.path ?? "").replace(/^\//, "").replace(/\/{2,}/, "/");
	const input = options.input;
	const params =
		// eslint-disable-next-line @typescript-eslint/no-explicit-any
		method === "get" && input
			? new URLSearchParams(input as any)
			: undefined;
	const queryParams = params ? `?${params.toString()}` : "";
	const parts = id.split("/");

	if (isValidUrl(id)) {
		const url = id.endsWith("/") ? id : `${id}/`;
		return `${url}${path}${queryParams}`;
	}

	const appId = ensureAppIdFormat(id);
	// const subdomain = options.subdomain ? `${options.subdomain}.` : '';
	const subdomain = process.env.NEXT_PUBLIC_API_DOMAIN;
	const url = `${subdomain}/${appId}/${path}`;
	// console.log("url", url);
	return `${url.replace(/\/$/, "")}${queryParams}`;
}

export async function send<Input, Output>(
	id: string,
	options: RunOptions<Input> & ExtraOptions = {},
): Promise<Output> {
	const input = options.input;
	// 	options.input && options.autoUpload !== false
	// 		? await storageImpl.transformInput(options.input)
	// 		: options.input;
	return dispatchRequest<Input, Output>(
		options.method ?? "post",
		buildUrl(id, options),
		input as Input,
	);
}

/**
 *
 * @param id the registered function revision id or alias.
 * @returns the remote function output
 */
export async function run<Input, Output>(
	id: string,
	options: RunOptions<Input> = {},
): Promise<Output> {
	return send(id, options);
}

/**
 * Subscribes to updates for a specific request in the queue.
 *
 * @param id - The ID or URL of the function web endpoint.
 * @param options - Options to configure how the request is run and how updates are received.
 * @returns A promise that resolves to the result of the request once it's completed.
 */
export async function subscribe<Input, Output>(
	id: string,
	options: RunOptions<Input> & QueueSubscribeOptions = {},
): Promise<Output> {
	const { request_id: requestId } = await queue.submit(id, options);
	if (options.onEnqueue) {
		options.onEnqueue(requestId);
	}
	return new Promise<Output>((resolve, reject) => {
		let timeoutId: ReturnType<typeof setTimeout>;
		const pollInterval = options.pollInterval ?? 1000;
		const poll = async () => {
			try {
				const requestStatus = await queue.status(id, {
					requestId,
					logs: options.logs ?? false,
				});
				if (options.onQueueUpdate) {
					options.onQueueUpdate(requestStatus);
				}
				if (requestStatus.status === "COMPLETED") {
					clearTimeout(timeoutId);
					try {
						const result = await queue.result<Output>(id, {
							requestId,
						});
						resolve(result);
					} catch (error) {
						reject(error);
					}
					return;
				}
				timeoutId = setTimeout(poll, pollInterval);
			} catch (error) {
				clearTimeout(timeoutId);
				reject(error);
			}
		};
		poll().catch(reject);
	});
}

/**
 * Options for subscribing to the request queue.
 */
type QueueSubscribeOptions = {
	/**
	 * The interval (in milliseconds) at which to poll for updates.
	 * If not provided, a default value of `1000` will be used.
	 */
	pollInterval?: number;

	/**
	 * Callback function that is called when a request is enqueued.
	 * @param requestId - The unique identifier for the enqueued request.
	 */
	onEnqueue?: (requestId: string) => void;

	/**
	 * Callback function that is called when the status of the queue changes.
	 * @param status - The current status of the queue.
	 */
	onQueueUpdate?: (status: QueueStatus) => void;

	/**
	 * If `true`, the response will include the logs for the request.
	 * Defaults to `false`.
	 */
	logs?: boolean;
};

/**
 * Options for submitting a request to the queue.
 */
type SubmitOptions<Input> = RunOptions<Input> & {
	/**
	 * The URL to send a webhook notification to when the request is completed.
	 * @see WebHookResponse
	 */
	webhookUrl?: string;
};

type BaseQueueOptions = {
	/**
	 * The unique identifier for the enqueued request.
	 */
	requestId: string;
};

type QueueStatusOptions = BaseQueueOptions & {
	/**
	 * If `true`, the response will include the logs for the request.
	 * Defaults to `false`.
	 */
	logs?: boolean;
};

/**
 * Represents a request queue with methods for submitting requests,
 * checking their status, retrieving results, and subscribing to updates.
 */
interface Queue {
	/**
	 * Submits a request to the queue.
	 *
	 * @param id - The ID or URL of the function web endpoint.
	 * @param options - Options to configure how the request is run.
	 * @returns A promise that resolves to the result of enqueuing the request.
	 */
	submit<Input>(
		id: string,
		options: SubmitOptions<Input>,
	): Promise<EnqueueResult>;

	/**
	 * Retrieves the status of a specific request in the queue.
	 *
	 * @param id - The ID or URL of the function web endpoint.
	 * @param options - Options to configure how the request is run.
	 * @returns A promise that resolves to the status of the request.
	 */
	status(id: string, options: QueueStatusOptions): Promise<QueueStatus>;

	/**
	 * Retrieves the result of a specific request from the queue.
	 *
	 * @param id - The ID or URL of the function web endpoint.
	 * @param options - Options to configure how the request is run.
	 * @returns A promise that resolves to the result of the request.
	 */
	result<Output>(id: string, options: BaseQueueOptions): Promise<Output>;

	/**
	 * @deprecated
	 */
	subscribe<Input, Output>(
		id: string,
		options: RunOptions<Input> & QueueSubscribeOptions,
	): Promise<Output>;
}

/**
 * The siliconflow run queue module. It allows to submit a function to the queue and get its result
 * on a separate call. This is useful for long running functions that can be executed
 * asynchronously and not .
 */
export const queue: Queue = {
	async submit<Input>(
		id: string,
		options: SubmitOptions<Input>,
	): Promise<EnqueueResult> {
		const { webhookUrl, path = "", ...runOptions } = options;
		const query = webhookUrl
			? "?" + new URLSearchParams({ fal_webhook: webhookUrl }).toString()
			: "";
		return send(id, {
			...runOptions,
			subdomain: "queue",
			method: "post",
			path: path + query,
		});
	},
	async status(
		id: string,
		{ requestId, logs = false }: QueueStatusOptions,
	): Promise<QueueStatus> {
		const [appOwner, appAlias] = ensureAppIdFormat(id).split("/");
		return send(`${appOwner}/${appAlias}`, {
			subdomain: "queue",
			method: "get",
			path: `/requests/${requestId}/status`,
			input: {
				logs: logs ? "1" : "0",
			},
		});
	},
	async result<Output>(
		id: string,
		{ requestId }: BaseQueueOptions,
	): Promise<Output> {
		const [appOwner, appAlias] = ensureAppIdFormat(id).split("/");
		return send(`${appOwner}/${appAlias}`, {
			subdomain: "queue",
			method: "get",
			path: `/requests/${requestId}`,
		});
	},
	subscribe,
};