import { getSiteSetting } from "@/lib/site-settings";

const LABELS: Record<string, string[]> = {
  bug: ["bug"],
  suggestion: ["enhancement"],
  question: ["question"],
};

/**
 * Opens an issue on the configured Gitea repo for a support ticket. Returns
 * the issue's HTML URL on success, or null if Gitea isn't configured or the
 * request fails — callers must treat this as best-effort, not block on it,
 * since the ticket itself is already saved regardless.
 */
export async function createGiteaIssue(opts: {
  type: string;
  title: string;
  body: string;
}): Promise<{ url: string | null; error: string | null }> {
  const [baseUrl, token, repo] = await Promise.all([
    getSiteSetting("GITEA_URL"),
    getSiteSetting("GITEA_TOKEN"),
    getSiteSetting("GITEA_REPO"),
  ]);

  if (!baseUrl || !token || !repo) {
    return { url: null, error: null };
  }

  try {
    const res = await fetch(`${baseUrl.replace(/\/$/, "")}/api/v1/repos/${repo}/issues`, {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
        Authorization: `token ${token}`,
      },
      body: JSON.stringify({
        title: opts.title,
        body: opts.body,
        labels: LABELS[opts.type] ?? [],
      }),
      signal: AbortSignal.timeout(10000),
    });

    if (!res.ok) {
      const text = await res.text().catch(() => "");
      return { url: null, error: `Gitea returned ${res.status}: ${text.slice(0, 300)}` };
    }

    const issue = (await res.json()) as { html_url?: string };
    return { url: issue.html_url ?? null, error: issue.html_url ? null : "Gitea response had no html_url" };
  } catch (err) {
    // A thrown fetch error (DNS failure, connection refused, timeout, TLS
    // error) never reaches the res.ok branch above, so its real cause would
    // otherwise be lost — err.message alone is often just "fetch failed"
    // with the actual reason nested in err.cause. Log server-side with the
    // full cause chain, and fold a short form into the returned message so
    // it also shows up in the admin support view's tooltip, not just logs.
    const cause = err instanceof Error && err.cause instanceof Error ? err.cause.message : undefined;
    const message = err instanceof Error ? err.message : "Unknown error";
    console.error("[gitea] createGiteaIssue failed", { baseUrl, repo, message, cause });
    return { url: null, error: cause ? `${message}: ${cause}` : message };
  }
}