n8n-nodes-starter/utils/sunoApi.ts

import type { SunoAuthResponse, SunoJob, SunoTrack, SunoPromptOptions } from '../../interfaces/SunoTypes';

// Module-level variable to store the dummy session token
let activeSessionToken: string | null = null;
// In-memory store for mock jobs
let mockJobs: Record<string, SunoJob> = {};

/**
 * @namespace SunoApiUtils
 * Utility functions for interacting with the Suno AI API.
 * These functions are placeholders and need to be implemented based on
 * the actual API behavior discovered during research (see docs/dev-log.md).
 */

/**
 * Logs in to the Suno AI service using email and password (mocked).
 * This function simulates a login by setting a dummy session token.
 *
 * @async
 * @memberof SunoApiUtils
 * @param {string} [email] - The user's email address.
 * @param {string} [password] - The user's password.
 * @returns {Promise<SunoAuthResponse>} A promise that resolves with the auth response (token or error).
 */
export async function loginWithCredentials(email?: string, password?: string): Promise<SunoAuthResponse> {
	console.log('[SunoApiUtils.loginWithCredentials] Called with email:', email);
	if (!email || !password) {
		console.error('[SunoApiUtils.loginWithCredentials] Email and password are required.');
		return Promise.resolve({ error: 'Email and password are required.' });
	}
	// Simulate a successful login
	activeSessionToken = 'dummy-session-token-' + Date.now();
	console.log('[SunoApiUtils.loginWithCredentials] Mock login successful. Dummy token set:', activeSessionToken);
	return Promise.resolve({ token: activeSessionToken });
}

/**
 * Retrieves the current session token (mocked).
 * This function returns the stored dummy session token.
 *
 * @async
 * @memberof SunoApiUtils
 * @returns {Promise<string | null>} A promise that resolves to the session token string, or null if not authenticated.
 */
export async function getSessionToken(): Promise<string | null> {
	console.log('[SunoApiUtils.getSessionToken] Returning active token:', activeSessionToken);
	return Promise.resolve(activeSessionToken);
}

/**
 * Checks if the current session is active/valid and refreshes it if necessary (mocked).
 * This function logs that it's called but doesn't implement refresh logic.
 *
 * @async
 * @memberof SunoApiUtils
 * @returns {Promise<string | null>} A promise that resolves to the current token (no actual refresh).
 */
export async function refreshSessionIfExpired(): Promise<string | null> {
	console.log('[SunoApiUtils.refreshSessionIfExpired] Called. Mocked: No refresh logic implemented, returning current token.');
	return Promise.resolve(activeSessionToken);
}

/**
 * Checks if the user is currently authenticated (mocked).
 * This checks for the presence of a dummy session token.
 *
 * @async
 * @memberof SunoApiUtils
 * @returns {Promise<boolean>} A promise that resolves to true if authenticated, false otherwise.
 */
export async function isAuthenticated(): Promise<boolean> {
	const authenticated = !!activeSessionToken;
	console.log('[SunoApiUtils.isAuthenticated] Checked token. Authenticated:', authenticated);
	return Promise.resolve(authenticated);
}

/**
 * Submits a prompt to Suno AI to generate music (mocked).
 *
 * @async
 * @memberof SunoApiUtils
 * @param {string} promptText - The text prompt describing the desired music.
 * @param {SunoPromptOptions} [options] - Optional parameters for the generation process.
 * @returns {Promise<SunoJob>} A promise that resolves with the mock job details.
 * @throws {Error} If not authenticated.
 */
export async function submitPrompt(promptText: string, options?: SunoPromptOptions): Promise<SunoJob> {
	if (!await isAuthenticated()) {
		throw new Error('Not authenticated. Please login first.');
	}
	console.log(`[SunoApiUtils.submitPrompt] Mock API: Submitting prompt "${promptText}" with options: ${JSON.stringify(options)}`);

	const mockJob: SunoJob = {
		id: 'job_' + Date.now(),
		status: 'queued',
		createdAt: new Date().toISOString(),
		progress: 0,
	};

	mockJobs[mockJob.id] = mockJob; // Store the job for polling simulation
	return Promise.resolve(mockJob);
}

/**
 * Uploads a reference audio track to Suno AI (placeholder).
 * This might be used for features like "continue track" or style transfer.
 *
 * @async
 * @memberof SunoApiUtils
 * @param {string} filePath - Path to the local audio file.
 * @param {object} [options] - Optional parameters for the upload.
 * @param {string} [options.title] - Title for the reference track.
 * @returns {Promise<any>} A promise that resolves with the API response (e.g., track ID).
 * @throws {Error} If not authenticated or if the API request fails.
 */
export async function uploadReferenceTrack(filePath: string, options: any = {}): Promise<any> {
	if (!await isAuthenticated()) {
		throw new Error('Not authenticated. Please login first.');
	}
	console.log('[SunoApiUtils.uploadReferenceTrack] Uploading reference track:', filePath, 'with options:', options);
	// TODO: Implement file reading and multipart/form-data request for upload for actual API.
	// For mock, we can just return a dummy ID.
	return Promise.resolve({ referenceTrackId: 'mock_ref_' + Date.now() });
}

/**
 * Selects a specific voice or instrument for generation (placeholder).
 * This assumes Suno AI has a concept of selectable voices/instruments.
 *
 * @async
 * @memberof SunoApiUtils
 * @param {string} voiceId - The ID of the voice/instrument to select.
 * @returns {Promise<void>} A promise that resolves when the selection is successful.
 * @throws {Error} If not authenticated or if the API request fails.
 */
export async function selectVoice(voiceId: string): Promise<void> {
	if (!await isAuthenticated()) {
		throw new Error('Not authenticated. Please login first.');
	}
	console.log('[SunoApiUtils.selectVoice] Selecting voice:', voiceId);
	// TODO: Implement API call to select a voice/instrument for actual API.
	return Promise.resolve();
}

/**
 * Polls the status of a generation job (mocked).
 *
 * @async
 * @memberof SunoApiUtils
 * @param {string} jobId - The ID of the job to poll.
 * @returns {Promise<SunoJob>} A promise that resolves with the job status information.
 * @throws {Error} If not authenticated.
 */
export async function pollJobStatus(jobId: string): Promise<SunoJob> {
	if (!await isAuthenticated()) {
		throw new Error('Not authenticated. Please login first.');
	}
	console.log(`[SunoApiUtils.pollJobStatus] Mock API: Polling job status for "${jobId}"`);

	let job = mockJobs[jobId];

	if (!job) {
		return Promise.resolve({ id: jobId, status: 'failed', error: 'Job not found', createdAt: new Date().toISOString() } as SunoJob);
	}

	// Simulate status change
	if (job.status === 'queued') {
		job.status = 'generating';
		job.progress = 50;
	} else if (job.status === 'generating') {
		job.status = 'complete';
		job.progress = 100;
		job.trackId = 'track_' + Date.now(); // Assign a trackId upon completion
	}
	// If 'complete' or 'failed', no further changes in this mock.

	mockJobs[jobId] = job; // Update the job in the store
	return Promise.resolve(job);
}

/**
 * Downloads a generated audio track (mocked).
 *
 * @async
 * @memberof SunoApiUtils
 * @param {string} trackId - The ID of the track to download.
 * @returns {Promise<Buffer>} A promise that resolves with the mock audio data.
 * @throws {Error} If not authenticated.
 */
export async function downloadTrack(trackId: string): Promise<Buffer> {
	if (!await isAuthenticated()) {
		throw new Error('Not authenticated. Please login first.');
	}
	console.log(`[SunoApiUtils.downloadTrack] Mock API: Downloading track "${trackId}"`);
	return Promise.resolve(Buffer.from('mock MP3 audio data for track ' + trackId));
}

/**
 * Lists previously generated songs by the user (mocked).
 *
 * @async
 * @memberof SunoApiUtils
 * @param {object} [options] - Optional parameters for listing songs (not used in mock).
 * @returns {Promise<SunoTrack[]>} A promise that resolves with an array of mock song objects.
 * @throws {Error} If not authenticated.
 */
export async function listPreviousSongs(options: any = {}): Promise<SunoTrack[]> {
	if (!await isAuthenticated()) {
		throw new Error('Not authenticated. Please login first.');
	}
	console.log('[SunoApiUtils.listPreviousSongs] Mock API: Listing previous songs.');

	const mockTracksArray: SunoTrack[] = [
		{
			id: 'track_' + (Date.now() - 10000),
			title: 'Mock Song Alpha',
			artist: 'Suno AI (Mock)',
			status: 'complete',
			audioUrl: 'https://example.com/mock_alpha.mp3',
			imageUrl: 'https://example.com/mock_alpha.png',
			duration: 180,
			createdAt: new Date(Date.now() - 10000).toISOString(),
			isPublic: true,
		},
		{
			id: 'track_' + Date.now(),
			title: 'Mock Song Beta',
			artist: 'Suno AI (Mock)',
			status: 'complete',
			audioUrl: 'https://example.com/mock_beta.mp3',
			imageUrl: 'https://example.com/mock_beta.png',
			duration: 210,
			createdAt: new Date().toISOString(),
			isPublic: false,
		},
	];
	return Promise.resolve(mockTracksArray);
}

// Example of how these might be called (for testing/ideation only):

/*
async function main() {
	try {
		const loginResponse = await loginWithCredentials('test@example.com', 'password123');
		if (loginResponse.token) {
			console.log('Login successful, token:', loginResponse.token);

			if (await isAuthenticated()) {
				console.log('User is authenticated.');

				// Test submitPrompt
				const job = await submitPrompt('Epic orchestral score for a space battle', { style: 'cinematic', instrumental: true });
				console.log('Submitted job:', job);

				// Test pollJobStatus - first poll (queued -> generating)
				let status = await pollJobStatus(job.id);
				console.log('Job status (1st poll):', status);

				// Test pollJobStatus - second poll (generating -> complete)
				status = await pollJobStatus(job.id);
				console.log('Job status (2nd poll):', status);

				if (status.trackId) {
					// Test downloadTrack
					const audioData = await downloadTrack(status.trackId);
					console.log('Downloaded track data length:', audioData.length);
				}

				// Test listPreviousSongs
				const songs = await listPreviousSongs();
				console.log('Previous songs:', songs);

				// Test job not found
				const notFoundJob = await pollJobStatus('job_invalid_id');
				console.log('Status for non-existent job:', notFoundJob);

			}
		} else {
			console.error('Login failed:', loginResponse.error);
		}
	} catch (error) {
		// console.error('Suno API Error:', error.message);
	}
}

// main();
*/