export interface GiteaRepoInfo {
  commits: number;
  releases: number;
  language: string;
  updatedAt: string;
  size: number;
  defaultBranch: string;
  topics: string[];
}

export interface GiteaConfig {
  domain: string;
  owner: string;
  repo: string;
}

export function parseGiteaUrl(url: string): GiteaConfig | null {
  try {
    const urlObj = new URL(url);
    const pathParts = urlObj.pathname.split("/").filter((p) => p);

    if (pathParts.length >= 2) {
      return {
        domain: urlObj.origin,
        owner: pathParts[0],
        repo: pathParts[1],
      };
    }
  } catch (e) {
    // Invalid URL
  }
  return null;
}

export async function fetchGiteaRepoInfo(
  config: GiteaConfig,
): Promise<GiteaRepoInfo | null> {
  try {
    const apiUrl = `${config.domain}/api/v1/repos/${config.owner}/${config.repo}`;

    const response = await fetch(apiUrl, {
      headers: {
        Accept: "application/json",
      },
      signal: AbortSignal.timeout(5000),
    });

    if (!response.ok) {
      return null;
    }

    const data = await response.json();

    let commitsCount = 0;
    try {
      const commitsUrl = `${config.domain}/api/v1/repos/${config.owner}/${config.repo}/commits?limit=1&stat=false`;
      const commitsResponse = await fetch(commitsUrl, {
        headers: {
          Accept: "application/json",
        },
        signal: AbortSignal.timeout(5000),
      });
      if (commitsResponse.ok) {
        const totalCount = commitsResponse.headers.get("X-Total-Count");
        commitsCount = totalCount ? parseInt(totalCount, 10) : 0;
      }
    } catch (error) {
      // Ignore
    }

    let releasesCount = 0;
    try {
      const releasesUrl = `${config.domain}/api/v1/repos/${config.owner}/${config.repo}/releases`;
      const releasesResponse = await fetch(releasesUrl, {
        headers: {
          Accept: "application/json",
        },
        signal: AbortSignal.timeout(5000),
      });
      if (releasesResponse.ok) {
        const releases = await releasesResponse.json();
        releasesCount = Array.isArray(releases) ? releases.length : 0;
      }
    } catch (error) {
      // Ignore
    }

    return {
      commits: commitsCount,
      releases: releasesCount,
      language: data.language || "Unknown",
      updatedAt: data.updated_at || data.pushed_at || "",
      size: data.size || 0,
      defaultBranch: data.default_branch || "main",
      topics: Array.isArray(data.topics) ? data.topics : [],
    };
  } catch (error) {
    return null;
  }
}

export async function fetchGiteaInfoFromUrl(
  url: string,
): Promise<GiteaRepoInfo | null> {
  const config = parseGiteaUrl(url);
  if (!config) {
    return null;
  }
  return fetchGiteaRepoInfo(config);
}

export function formatRelativeTime(dateString: string): string {
  if (!dateString) return "Unknown";

  const date = new Date(dateString);
  const now = new Date();
  const diffMs = now.getTime() - date.getTime();
  const diffDays = Math.floor(diffMs / (1000 * 60 * 60 * 24));
  const diffHours = Math.floor(diffMs / (1000 * 60 * 60));
  const diffMinutes = Math.floor(diffMs / (1000 * 60));

  if (diffMinutes < 60) {
    return `${diffMinutes} minute${diffMinutes !== 1 ? "s" : ""} ago`;
  } else if (diffHours < 24) {
    return `${diffHours} hour${diffHours !== 1 ? "s" : ""} ago`;
  } else if (diffDays < 30) {
    return `${diffDays} day${diffDays !== 1 ? "s" : ""} ago`;
  } else if (diffDays < 365) {
    const months = Math.floor(diffDays / 30);
    return `${months} month${months !== 1 ? "s" : ""} ago`;
  } else {
    const years = Math.floor(diffDays / 365);
    return `${years} year${years !== 1 ? "s" : ""} ago`;
  }
}

export function formatRepoSize(sizeKb: number): string {
  if (sizeKb < 1024) {
    return `${sizeKb} KB`;
  } else if (sizeKb < 1024 * 1024) {
    return `${(sizeKb / 1024).toFixed(1)} MB`;
  } else {
    return `${(sizeKb / (1024 * 1024)).toFixed(1)} GB`;
  }
}