/**
 * LiteLLM login flow.
 *
 * LiteLLM is an OpenAI-compatible proxy that routes requests to many upstream providers.
 *
 * This is not OAuth - it's a simple API key flow:
 * 1. Open browser to LiteLLM docs/dashboard
 * 2. User copies their LiteLLM API key
 * 3. User pastes the API key into the CLI
 */

import type { OAuthController } from "./types";

const AUTH_URL = "https://docs.litellm.ai/docs/proxy/deploy";

/**
 * Login to LiteLLM.
 *
 * Opens browser to LiteLLM setup docs, prompts user to paste their API key.
 * Returns the API key directly (not OAuthCredentials - this isn't OAuth).
 */
export async function loginLiteLLM(options: OAuthController): Promise<string> {
	if (!options.onPrompt) {
		throw new Error("LiteLLM login requires onPrompt callback");
	}

	options.onAuth?.({
		url: AUTH_URL,
		instructions: "Run LiteLLM proxy (default http://localhost:4000/v1), then copy your master key or virtual key",
	});

	const apiKey = await options.onPrompt({
		message: "Paste your LiteLLM API key (master key or virtual key)",
		placeholder: "sk-...",
	});

	if (options.signal?.aborted) {
		throw new Error("Login cancelled");
	}

	const trimmed = apiKey.trim();
	if (!trimmed) {
		throw new Error("API key is required");
	}

	return trimmed;
}