import { getTokenAsync } from "../github/auth.ts";
import type { UnifiedRepo } from "../types/index.ts";

export async function fetchReadme(
  repo: UnifiedRepo,
): Promise<{ content: string | null; error: string | null }> {
  if (repo.localPath) {
    try {
      const file = Bun.file(`${repo.localPath}/README.md`);
      if (await file.exists()) {
        const content = await file.text();
        return { content, error: null };
      }
    } catch {
      // Expected: README may not exist locally
    }
  }

  if (repo.github) {
    try {
      const token = await getTokenAsync();
      const headers: Record<string, string> = {
        Accept: "application/vnd.github.raw",
      };
      if (token) {
        headers["Authorization"] = `Bearer ${token}`;
      }
      const response = await fetch(
        `https://api.github.com/repos/${repo.github.fullName}/readme`,
        { headers },
      );
      if (response.ok) {
        const content = await response.text();
        return { content, error: null };
      }
    } catch {
      // Expected: repo may not have a README on GitHub
    }
  }

  return { content: null, error: "README not found" };
}