import {
  login,
  logout,
  getAuthStatus,
  isGhInstalled,
} from "../../github/auth.ts";
import {
  formatAuthSuccess,
  formatNoToken,
  formatError,
  formatInfo,
} from "../formatters.ts";

/**
 * Show GitHub authentication status
 */
export async function showGitHubAuth(): Promise<void> {
  const status = await getAuthStatus();

  if (!status.authenticated) {
    console.log(formatNoToken());
    console.log(formatInfo("\nRun 'gitforest login' to authenticate with GitHub."));
    return;
  }

  console.log(formatAuthSuccess(status.user ?? "unknown", undefined));
  console.log(formatInfo(`  Auth source: ${status.source === "env" ? "environment variable" : "gh CLI"}`));
}

/**
 * Login to GitHub using gh CLI
 */
export async function loginGitHub(): Promise<void> {
  // Check if gh is installed
  const ghInstalled = await isGhInstalled();
  if (!ghInstalled) {
    console.log(formatError("GitHub CLI (gh) is not installed."));
    console.log(formatInfo("Install it from: https://cli.github.com"));
    console.log(formatInfo("\nOr set GITHUB_TOKEN environment variable manually."));
    process.exit(1);
  }

  // Check if already authenticated
  const status = await getAuthStatus();
  if (status.authenticated) {
    console.log(formatInfo(`Already logged in as ${status.user ?? "unknown"}`));
    console.log(formatInfo("Run 'gitforest logout' first to login as a different user."));
    return;
  }

  const result = await login();

  if (result.success) {
    console.log(`\n${formatAuthSuccess(result.user ?? "unknown", undefined)}`);
    console.log(formatInfo("You can now use GitHub features."));
  } else {
    console.log(formatError(`Login failed: ${result.error}`));
    process.exit(1);
  }
}

/**
 * Logout from GitHub
 */
export async function logoutGitHub(): Promise<void> {
  const status = await getAuthStatus();

  if (!status.authenticated) {
    console.log(formatInfo("Not logged in."));
    return;
  }

  await logout();
  console.log(formatInfo("Logged out successfully."));
}