import { getRawCredentialsByProvider } from "./credentials";

export interface RepoResult {
  provider: "github" | "gitlab" | "gitea";
  fullName: string;
  url: string;
  description: string;
  defaultBranch: string;
  private: boolean;
}

export async function searchRepos(query: string): Promise<RepoResult[]> {
  if (!query || query.length < 2) return [];

  const results = await Promise.allSettled([
    searchGitHub(query),
    searchGitLab(query),
    searchGitea(query),
  ]);

  return results.flatMap(r => r.status === "fulfilled" ? r.value : []);
}

async function searchGitHub(query: string): Promise<RepoResult[]> {
  const creds = await getRawCredentialsByProvider("github");
  if (creds.length === 0) return [];

  const results: RepoResult[] = [];

  for (const cred of creds) {
    try {
      const res = await fetch(
        `https://api.github.com/search/repositories?q=${encodeURIComponent(query)}&per_page=10&sort=updated`,
        {
          headers: {
            Authorization: `Bearer ${cred.token}`,
            Accept: "application/vnd.github+json",
            "X-GitHub-Api-Version": "2022-11-28",
          },
        }
      );

      if (!res.ok) continue;

      const data = await res.json();
      for (const repo of data.items || []) {
        results.push({
          provider: "github",
          fullName: repo.full_name,
          url: repo.html_url,
          description: repo.description || "",
          defaultBranch: repo.default_branch || "main",
          private: repo.private,
        });
      }
    } catch {
      // skip failed credential
    }
  }

  return results;
}

async function searchGitLab(query: string): Promise<RepoResult[]> {
  const creds = await getRawCredentialsByProvider("gitlab");
  if (creds.length === 0) return [];

  const results: RepoResult[] = [];

  for (const cred of creds) {
    const baseUrl = cred.baseUrl || "https://gitlab.com";
    try {
      const res = await fetch(
        `${baseUrl}/api/v4/projects?search=${encodeURIComponent(query)}&per_page=10&order_by=updated_at&membership=true`,
        {
          headers: {
            "PRIVATE-TOKEN": cred.token,
          },
        }
      );

      if (!res.ok) continue;

      const data = await res.json();
      for (const project of data) {
        results.push({
          provider: "gitlab",
          fullName: project.path_with_namespace,
          url: project.web_url,
          description: project.description || "",
          defaultBranch: project.default_branch || "main",
          private: project.visibility === "private",
        });
      }
    } catch {
      // skip failed credential
    }
  }

  return results;
}

async function searchGitea(query: string): Promise<RepoResult[]> {
  const creds = await getRawCredentialsByProvider("gitea");
  if (creds.length === 0) return [];

  const results: RepoResult[] = [];

  for (const cred of creds) {
    const baseUrl = cred.baseUrl || "https://gitea.coreworlds.io";
    try {
      const res = await fetch(
        `${baseUrl}/api/v1/repos/search?q=${encodeURIComponent(query)}&limit=10&sort=updated`,
        {
          headers: {
            Authorization: `token ${cred.token}`,
          },
        }
      );

      if (!res.ok) {
        console.error(`[repo-search] Gitea search failed: ${res.status} ${res.statusText}`);
        continue;
      }

      const data = await res.json();
      // Rewrite internal service URLs to external Gitea URL
      const externalUrl = process.env.GITEA_EXTERNAL_URL || "https://gitea.coreworlds.io";
      for (const repo of data.data || []) {
        let htmlUrl: string = repo.html_url || "";
        if (baseUrl !== externalUrl && htmlUrl.startsWith(baseUrl)) {
          htmlUrl = externalUrl + htmlUrl.slice(baseUrl.length);
        }
        results.push({
          provider: "gitea",
          fullName: repo.full_name,
          url: htmlUrl,
          description: repo.description || "",
          defaultBranch: repo.default_branch || "main",
          private: repo.private,
        });
      }
    } catch (err) {
      console.error(`[repo-search] Gitea search error:`, err);
    }
  }

  return results;
}