/**
 * Video Streaming System - Input/Output Architecture
 * Clean separation between input sources and output destinations
 */

import { video } from "@robothub/transport-server-client";
import type { video as videoTypes } from "@robothub/transport-server-client";
import { settings } from "$lib/runes/settings.svelte";

// Input/Output state using runes
export class VideoStreamingState {
	// Input state (what you're viewing)
	input = $state({
		type: null as "local-camera" | "remote-stream" | null,
		stream: null as MediaStream | null,
		client: null as videoTypes.VideoConsumer | null,
		roomId: null as string | null
	});

	// Output state (what you're broadcasting)
	output = $state({
		active: false,
		client: null as videoTypes.VideoProducer | null,
		roomId: null as string | null
	});

	// Room listing state
	rooms = $state<videoTypes.RoomInfo[]>([]);
	roomsLoading = $state(false);

	// Derived state
	get hasInput() {
		return this.input.type !== null && this.input.stream !== null;
	}

	get hasOutput() {
		return this.output.active;
	}

	get canOutput() {
		// Can only output if input is local camera (not remote stream)
		return this.input.type === "local-camera" && this.input.stream !== null;
	}

	get currentStream() {
		return this.input.stream;
	}
}

// Create global instance
export const videoStreaming = new VideoStreamingState();

// External action functions
export const videoActions = {
	// Room management
	async listRooms(workspaceId: string): Promise<videoTypes.RoomInfo[]> {
		videoStreaming.roomsLoading = true;
		try {
			const client = new video.VideoClientCore(settings.transportServerUrl);
			const rooms = await client.listRooms(workspaceId);
			videoStreaming.rooms = rooms;
			return rooms;
		} catch (error) {
			console.error("Failed to list rooms:", error);
			videoStreaming.rooms = [];
			return [];
		} finally {
			videoStreaming.roomsLoading = false;
		}
	},

	// Input actions
	async connectLocalCamera(): Promise<{ success: boolean; error?: string }> {
		try {
			// Get local camera stream - no server connection needed for local viewing
			const stream = await navigator.mediaDevices.getUserMedia({
				video: { width: 1280, height: 720 },
				audio: true
			});

			// First disconnect any existing input to avoid conflicts
			await this.disconnectInput();

			// Update input state - purely local, no server interaction
			videoStreaming.input.type = "local-camera";
			videoStreaming.input.stream = stream;
			videoStreaming.input.client = null;
			videoStreaming.input.roomId = null;

			console.log("Local camera connected (local viewing only)");
			return { success: true };
		} catch (error) {
			console.error("Failed to connect local camera:", error);
			return { success: false, error: error instanceof Error ? error.message : String(error) };
		}
	},

	async connectRemoteStream(
		workspaceId: string,
		roomId: string
	): Promise<{ success: boolean; error?: string }> {
		try {
			// First disconnect any existing input
			await this.disconnectInput();

			const consumer = new video.VideoConsumer(settings.transportServerUrl);
			const connected = await consumer.connect(workspaceId, roomId, "consumer-id");

			if (!connected) {
				throw new Error("Failed to connect to remote stream");
			}

			// Start receiving video
			await consumer.startReceiving();

			// Set up stream receiving
			consumer.on("streamReceived", (stream: MediaStream) => {
				videoStreaming.input.stream = stream;
			});

			// Update input state
			videoStreaming.input.type = "remote-stream";
			videoStreaming.input.client = consumer;
			videoStreaming.input.roomId = roomId;

			console.log("Remote stream connected");
			return { success: true };
		} catch (error) {
			console.error("Failed to connect remote stream:", error);
			return { success: false, error: error instanceof Error ? error.message : String(error) };
		}
	},

	async disconnectInput(): Promise<void> {
		// Stop local camera tracks if any
		if (videoStreaming.input.stream && videoStreaming.input.type === "local-camera") {
			videoStreaming.input.stream.getTracks().forEach((track) => track.stop());
		}

		// Disconnect remote client if any
		if (videoStreaming.input.client) {
			videoStreaming.input.client.disconnect();
		}

		// Reset input state
		videoStreaming.input.type = null;
		videoStreaming.input.stream = null;
		videoStreaming.input.client = null;
		videoStreaming.input.roomId = null;

		console.log("Input disconnected");
	},

	// Output actions
	async startOutput(
		workspaceId: string
	): Promise<{ success: boolean; error?: string; roomId?: string }> {
		if (!videoStreaming.canOutput) {
			return { success: false, error: "Cannot output - input must be local camera" };
		}

		try {
			const producer = new video.VideoProducer(settings.transportServerUrl);

			// Create room
			const roomData = await producer.createRoom(workspaceId);
			const connected = await producer.connect(
				roomData.workspaceId,
				roomData.roomId,
				"producer-id"
			);

			if (!connected) {
				throw new Error("Failed to connect producer");
			}

			// Use the current input stream for output by starting camera with existing stream
			if (videoStreaming.input.stream) {
				// We need to use the producer's startCamera method properly
				// For now, we'll start a new camera stream since we can't directly use existing stream
				await producer.startCamera({
					video: { width: 1280, height: 720 },
					audio: true
				});
			}

			// Update output state
			videoStreaming.output.active = true;
			videoStreaming.output.client = producer;
			videoStreaming.output.roomId = roomData.roomId;

			// Refresh room list
			await this.listRooms(workspaceId);

			console.log("Output started, room created:", roomData.roomId);
			return { success: true, roomId: roomData.roomId };
		} catch (error) {
			console.error("Failed to start output:", error);
			return { success: false, error: error instanceof Error ? error.message : String(error) };
		}
	},

	async stopOutput(): Promise<void> {
		if (videoStreaming.output.client) {
			videoStreaming.output.client.disconnect();
		}

		// Reset output state
		videoStreaming.output.active = false;
		videoStreaming.output.client = null;
		videoStreaming.output.roomId = null;

		console.log("Output stopped");
	},

	// Utility functions
	async refreshRooms(workspaceId: string): Promise<void> {
		await this.listRooms(workspaceId);
	},

	getAvailableRooms(): videoTypes.RoomInfo[] {
		return videoStreaming.rooms.filter((room) => room.participants.producer !== null);
	},

	getRoomById(roomId: string): videoTypes.RoomInfo | undefined {
		return videoStreaming.rooms.find((room) => room.id === roomId);
	}
};