import type { DeepReadonly } from "ts-essentials";

import { NodeCGAPIBase } from "../../shared/api.base";
import type { NodeCG } from "../../types/nodecg";
import type { TypedClientSocket } from "../../types/socket-protocol";
import { filteredConfig } from "./config";
import { Logger } from "./logger";
import { ClientReplicant } from "./replicant";

type SendMessageCb<T> = (error?: unknown, response?: T) => void;

type ReadReplicantCb<T = unknown> = (value: T | undefined) => void;

// eslint-disable-next-line @typescript-eslint/no-empty-object-type
interface EventMap {
	//
}

const soundMetadata = new WeakMap<
	createjs.AbstractSoundInstance,
	{ cueName: string; updateVolume: boolean }
>();
const apiContexts = new Set<NodeCGAPIClient<Record<string, any>>>();

/**
 * This is what enables intra-context messaging.
 * I.e., passing messages from one extension to another in the same Node.js context.
 */
function _forwardMessageToContext(
	messageName: string,
	bundleName: string,
	data: unknown,
): void {
	setTimeout(() => {
		apiContexts.forEach((ctx) => {
			ctx._messageHandlers.forEach((handler) => {
				if (
					messageName === handler.messageName &&
					bundleName === handler.bundleName
				) {
					handler.func(data);
				}
			});
		});
	}, 0);
}

export class NodeCGAPIClient<
	C extends Record<string, any> = NodeCG.Bundle.UnknownConfig,
> extends NodeCGAPIBase<"client", C, EventMap> {
	static Replicant<
		V,
		O extends NodeCG.Replicant.Options<V> = NodeCG.Replicant.Options<V>,
	>(
		name: string,
		namespace: string,
		opts: O = {} as Record<any, unknown>,
	): ClientReplicant<V, O> {
		return new ClientReplicant<V, O>(
			name,
			namespace,
			opts,
			(globalThis as any).socket,
		);
	}

	static sendMessageToBundle<T = unknown>(
		messageName: string,
		bundleName: string,
		cb: SendMessageCb<T>,
	): void;
	static sendMessageToBundle<T = unknown>(
		messageName: string,
		bundleName: string,
		data?: unknown,
	): Promise<T>;
	static sendMessageToBundle<T = unknown>(
		messageName: string,
		bundleName: string,
		data: unknown,
		cb: SendMessageCb<T>,
	): void;
	static sendMessageToBundle<T = unknown>(
		messageName: string,
		bundleName: string,
		dataOrCb?: unknown,
		cb?: SendMessageCb<T>,
	): void | Promise<T> {
		let data: any = null;
		if (typeof dataOrCb === "function") {
			cb = dataOrCb as SendMessageCb<T>;
		} else {
			data = dataOrCb;
		}

		_forwardMessageToContext(messageName, bundleName, data);

		if (typeof cb === "function") {
			globalThis.socket.emit(
				"message",
				{
					bundleName,
					messageName,
					content: data,
				},
				(err, response?) => {
					if (response) {
						cb(err, response as T);
					} else {
						cb(err);
					}
				},
			);
		} else {
			return new Promise<T>((resolve, reject) => {
				globalThis.socket.emit(
					"message",
					{
						bundleName,
						messageName,
						content: data,
					},
					(err, response?) => {
						if (err) {
							reject(err);
						} else {
							resolve(response as T);
						}
					},
				);
			});
		}
	}

	static readReplicant<T = unknown>(
		name: string,
		namespace: string,
		cb: ReadReplicantCb<T>,
	): void {
		globalThis.socket.emit(
			"replicant:read",
			{ name, namespace },
			(error, value?) => {
				if (error) {
					console.error(error);
				} else {
					cb(value as T | undefined);
				}
			},
		);
	}

	get Logger(): new (name: string) => NodeCG.Logger {
		return Logger;
	}

	get log(): NodeCG.Logger {
		if (this._memoizedLogger) {
			return this._memoizedLogger;
		}

		this._memoizedLogger = new Logger(this.bundleName);
		return this._memoizedLogger;
	}

	/**
	 * A filtered copy of the NodeCG server config with some sensitive keys removed.
	 */
	get config(): DeepReadonly<typeof filteredConfig> {
		return Object.freeze(JSON.parse(JSON.stringify(filteredConfig)));
	}

	readonly socket: TypedClientSocket;

	soundsReady = false;

	private readonly _soundFiles?: ClientReplicant<NodeCG.AssetFile[]>;

	private readonly _bundleVolume?: ClientReplicant<number>;

	private readonly _masterVolume?: ClientReplicant<number>;

	private _soundCues: NodeCG.SoundCue[] = [];

	private _memoizedLogger?: NodeCG.Logger;

	constructor(
		bundle: NodeCG.Bundle & { _hasSounds?: boolean },
		socket: TypedClientSocket,
	) {
		super(bundle);
		apiContexts.add(this);

		// If title isn't set, set it to the bundle name
		if (globalThis.document) {
			document.addEventListener(
				"DOMContentLoaded",
				() => {
					if (document.title === "") {
						document.title = this.bundleName;
					}
				},
				false,
			);
		}

		// Make socket accessible to public methods
		this.socket = socket;
		// eslint-disable-next-line @typescript-eslint/no-empty-function
		this.socket.emit("joinRoom", bundle.name, () => {});

		if (globalThis.window && bundle._hasSounds && window.createjs?.Sound) {
			const soundCuesRep = new ClientReplicant<NodeCG.SoundCue[]>(
				"soundCues",
				this.bundleName,
				{},
				socket,
			);
			this._soundFiles = new ClientReplicant<NodeCG.AssetFile[]>(
				"assets:sounds",
				this.bundleName,
				{},
				socket,
			);
			this._bundleVolume = new ClientReplicant<number>(
				`volume:${this.bundleName}`,
				"_sounds",
				{},
				socket,
			);
			this._masterVolume = new ClientReplicant<number>(
				"volume:master",
				"_sounds",
				{},
				socket,
			);

			this._soundCues = [];

			const loadedSums = new Set();
			window.createjs.Sound.on("fileload", (e: any) => {
				if (this.soundsReady || !e.data.sum) {
					return;
				}

				loadedSums.add(e.data.sum);
				const foundUnloaded = this._soundCues.some((cue) => {
					if (cue.file) {
						return !loadedSums.has(cue.file.sum);
					}

					return false;
				});
				if (!foundUnloaded && !this.soundsReady) {
					this.soundsReady = true;
					window.dispatchEvent(new CustomEvent("ncgSoundsReady"));
				}
			});

			const handleAnyCuesRepChange = (): void => {
				this._soundCues = soundCuesRep.value ?? [];
				this._updateInstanceVolumes();
				this._registerSounds();
			};

			soundCuesRep.on("change", handleAnyCuesRepChange);

			this._soundFiles.on("change", () => this._registerSounds.bind(this));
			this._bundleVolume.on("change", () =>
				this._updateInstanceVolumes.bind(this),
			);
			this._masterVolume.on("change", () =>
				this._updateInstanceVolumes.bind(this),
			);
		}

		// Upon receiving a message, execute any handlers for it
		socket.on("message", (data) => {
			this.log.trace(
				"Received message %s (sent to bundle %s) with data:",
				data.messageName,
				data.bundleName,
				data.content,
			);

			this._messageHandlers.forEach((handler) => {
				if (
					data.messageName === handler.messageName &&
					data.bundleName === handler.bundleName
				) {
					handler.func(data.content);
				}
			});
		});

		socket.io.on("error", (err) => {
			this.log.warn("Unhandled socket connection error:", err);
		});

		socket.on("protocol_error", (err) => {
			if (err.type === "UnauthorizedError") {
				if (globalThis.window) {
					const url = [
						location.protocol,
						"//",
						location.host,
						location.pathname,
					].join("");
					window.location.href = `/authError?code=${err.code as string}&message=${err.message}&viewUrl=${url}`;
				} else {
					globalThis.close();
				}
			} else {
				this.log.error("Unhandled socket protocol error:", err);
			}
		});
	}

	/**
	 * _Browser only, except workers_<br/>
	 * Returns the specified dialog element.
	 * @param {string} name - The desired dialog's name.
	 * @param {string} [bundle=CURR_BNDL] - The bundle from which to select the dialog.
	 * @returns {object}
	 */
	getDialog(
		name: string,
		bundle?: string,
	):
		| (HTMLElement & {
				opened: boolean;
				close: () => void;
				open: () => void;
		  })
		| undefined {
		if (!globalThis.window) {
			return undefined;
		}

		bundle = bundle ?? this.bundleName;
		const topDoc = window.top?.document;
		if (!topDoc) {
			return undefined;
		}

		const dialog = topDoc
			.querySelector("ncg-dashboard")
			?.shadowRoot?.querySelector(`#dialogs #${bundle}_${name}`);
		return (dialog as any) ?? undefined;
	}

	/**
	 * _Browser only, except workers_<br/>
	 * Returns the specified dialog's iframe document.
	 * @param {string} name - The desired dialog's name.
	 * @param {string} [bundle=CURR_BNDL] - The bundle from which to select the dialog.
	 * @returns {object}
	 */
	getDialogDocument(name: string, bundle?: string): Document | undefined {
		if (!globalThis.window) {
			return undefined;
		}

		bundle = bundle ?? this.bundleName;
		return this.getDialog(name, bundle)?.querySelector("iframe")?.contentWindow
			?.document;
	}

	/**
	 * Returns the sound cue of the provided `cueName` in the current bundle.
	 * Returns undefined if a cue by that name cannot be found in this bundle.
	 */
	findCue(cueName: string): NodeCG.SoundCue | undefined {
		return this._soundCues.find((cue) => cue.name === cueName);
	}

	/**
	 * Plays the sound cue of the provided `cueName` in the current bundle.
	 * Does nothing if the cue doesn't exist or if the cue has no assigned file to play.
	 * @param cueName {String}
	 * @param [opts] {Object}
	 * @param [opts.updateVolume=true] - Whether or not to let NodeCG automatically update this instance's volume
	 * when the user changes it on the dashboard.
	 * @returns {Object|undefined} - A SoundJS AbstractAudioInstance.
	 */
	playSound(
		cueName: string,
		{ updateVolume = true }: { updateVolume: boolean } = { updateVolume: true },
	): createjs.AbstractSoundInstance {
		if (!globalThis.window) {
			throw new Error("NodeCG Sound API methods are not available in workers");
		}

		if (!this._soundCues) {
			throw new Error(`Bundle "${this.bundleName}" has no soundCues`);
		}

		const cue = this.findCue(cueName);
		if (!cue) {
			throw new Error(
				`Cue "${cueName}" does not exist in bundle "${this.bundleName}"`,
			);
		}

		if (!window.createjs?.Sound) {
			throw new Error(
				"NodeCG Sound API methods are not available when SoundJS isn't present",
			);
		}

		if (!cue.file) {
			throw new Error(`Cue $"{cueName}" does not have a file specified.`);
		}

		// Create an instance of the sound, which begins playing immediately.
		const instance = window.createjs.Sound.play(cueName);

		// Set the volume.
		this._setInstanceVolume(instance, cue);

		soundMetadata.set(instance, { cueName, updateVolume });
		return instance;
	}

	/**
	 * Stops all currently playing instances of the provided `cueName`.
	 * @param cueName {String}
	 */
	stopSound(cueName: string): void {
		if (!globalThis.window) {
			throw new Error("NodeCG Sound API methods are not available in workers");
		}

		if (!this._soundCues) {
			throw new Error(`Bundle "${this.bundleName}" has no soundCues`);
		}

		if (!this._soundCues.find((cue) => cue.name === cueName)) {
			throw new Error(
				`Cue "${cueName}" does not exist in bundle "${this.bundleName}"`,
			);
		}

		if (!window.createjs?.Sound) {
			throw new Error(
				"NodeCG Sound API methods are not available when SoundJS isn't present",
			);
		}

		const instancesArr = (window.createjs.Sound as any)
			._instances as createjs.AbstractSoundInstance[];
		for (let i = instancesArr.length - 1; i >= 0; i--) {
			const instance = instancesArr[i]!;
			const meta = soundMetadata.get(instance);
			if (meta?.cueName === cueName) {
				instance.stop();
			}
		}
	}

	/**
	 * Stops all currently playing sounds on the page.
	 */
	stopAllSounds(): void {
		if (!globalThis.window) {
			throw new Error("NodeCG Sound API methods are not available in workers");
		}

		if (!window.createjs?.Sound) {
			throw new Error(
				"NodeCG Sound API methods are not available when SoundJS isn't present",
			);
		}

		window.createjs.Sound.stop();
	}

	sendMessageToBundle<T = unknown>(
		messageName: string,
		bundleName: string,
		cb: SendMessageCb<T>,
	): void;
	sendMessageToBundle<T = unknown>(
		messageName: string,
		bundleName: string,
		data?: unknown,
	): Promise<T>;
	sendMessageToBundle<T = unknown>(
		messageName: string,
		bundleName: string,
		data: unknown,
		cb: SendMessageCb<T>,
	): void;
	sendMessageToBundle<T = unknown>(
		messageName: string,
		bundleName: string,
		dataOrCb?: unknown,
		cb?: SendMessageCb<T>,
	): void | Promise<T> {
		return NodeCGAPIClient.sendMessageToBundle(
			messageName,
			bundleName,
			dataOrCb,
			cb as any,
		);
	}

	sendMessage<T = unknown>(messageName: string, cb: SendMessageCb<T>): void;
	sendMessage<T = unknown>(messageName: string, data?: unknown): Promise<T>;
	sendMessage<T = unknown>(
		messageName: string,
		data: unknown,
		cb: SendMessageCb<T>,
	): void;
	sendMessage<T = unknown>(
		messageName: string,
		dataOrCb?: unknown,
		cb?: SendMessageCb<T>,
	): void | Promise<T> {
		return this.sendMessageToBundle(
			messageName,
			this.bundleName,
			dataOrCb,
			cb as any,
		);
	}

	readReplicant<T = unknown>(name: string, cb: ReadReplicantCb<T>): void;
	readReplicant<T = unknown>(
		name: string,
		namespace: string,
		cb: ReadReplicantCb<T>,
	): void;
	readReplicant<T = unknown>(
		name: string,
		nspOrCb: string | ReadReplicantCb<T>,
		maybeCb?: ReadReplicantCb<T>,
	): void {
		let namespace = this.bundleName;
		let cb: ReadReplicantCb<T>;
		if (typeof nspOrCb === "string") {
			namespace = nspOrCb;
			cb = maybeCb!;
		} else {
			cb = nspOrCb;
		}

		NodeCGAPIClient.readReplicant<T>(name, namespace, cb);
	}

	protected _replicantFactory = <
		V,
		O extends NodeCG.Replicant.Options<V> = NodeCG.Replicant.Options<V>,
	>(
		name: string,
		namespace: string,
		opts: O,
	): ClientReplicant<V, O> =>
		new ClientReplicant<V, O>(name, namespace, opts, this.socket);

	private _registerSounds(): void {
		if (!globalThis.window) {
			throw new Error("NodeCG Sound API methods are not available in workers");
		}

		this._soundCues.forEach((cue) => {
			if (!cue.file) {
				return;
			}

			window.createjs.Sound.registerSound(
				`${cue.file.url}?sum=${cue.file.sum}`,
				cue.name,
				{
					channels: typeof cue.channels === "undefined" ? 100 : cue.channels,
					sum: cue.file.sum,
				},
			);
		});
	}

	private _setInstanceVolume(
		instance: createjs.AbstractSoundInstance,
		cue: NodeCG.SoundCue,
	): void {
		if (
			this._masterVolume?.status !== "declared" ||
			typeof this._masterVolume.value !== "number" ||
			this._bundleVolume?.status !== "declared" ||
			typeof this._bundleVolume.value !== "number"
		) {
			return;
		}

		const volume =
			(this._masterVolume.value / 100) *
			(this._bundleVolume.value / 100) *
			(cue.volume / 100);
		// Volue value must be finite or SoundJS throws error
		instance.volume = isFinite(volume) ? volume : 0;
	}

	private _updateInstanceVolumes(): void {
		const instancesArr = (window.createjs.Sound as any)
			._instances as createjs.AbstractSoundInstance[];

		// Update the volume of any playing instances that haven't opted out of automatic volume updates.
		this._soundCues.forEach((cue) => {
			instancesArr.forEach((instance) => {
				const meta = soundMetadata.get(instance);
				if (meta && meta.cueName === cue.name && meta.updateVolume) {
					this._setInstanceVolume(instance, cue);
				}
			});
		});
	}
}

(globalThis as any).NodeCG = NodeCGAPIClient;