/**
 * Gitea API Client for Pull Request Reviews
 */
class GiteaClient {
  constructor(baseUrl, token) {
    this.baseUrl = baseUrl.replace(/\/+$/, '');
    this.token = token;
    this.headers = {
      'Authorization': `token ${this.token}`,
      'Content-Type': 'application/json'
    };
  }

  async request(path, options = {}) {
    const url = `${this.baseUrl}/api/v1${path}`;
    const fetchOptions = {
      ...options,
      headers: {
        ...this.headers,
        ...options.headers
      }
    };

    const response = await fetch(url, fetchOptions);

    if (!response.ok) {
      const errorBody = await response.text().catch(() => 'Unable to read error response');
      throw new Error(`Gitea API Error: ${response.status} ${response.statusText} - ${errorBody}`);
    }

    if (response.status === 204) {
      return null;
    }

    return await response.json();
  }

  /**
   * List all review comments on a PR
   */
  async listPullRequestComments(owner, repo, index) {
    return await this.request(`/repos/${owner}/${repo}/pulls/${index}/comments`);
  }

  /**
   * Create a review comment on a specific line of a file in a PR
   */
  async createPullRequestComment(owner, repo, index, { body, path, new_line, old_line, commit_id }) {
    return await this.request(`/repos/${owner}/${repo}/pulls/${index}/comments`, {
      method: 'POST',
      body: JSON.stringify({ body, path, new_line, old_line, commit_id })
    });
  }

  /**
   * Update an existing review comment
   */
  async updatePullRequestComment(owner, repo, commentId, body) {
    return await this.request(`/repos/${owner}/${repo}/pulls/comments/${commentId}`, {
      method: 'PATCH',
      body: JSON.stringify({ body })
    });
  }

  /**
   * Create a review (summary + optional comments) on a PR
   */
  async createReview(owner, repo, index, { body, event, comments = [] }) {
    return await this.request(`/repos/${owner}/${repo}/pulls/${index}/reviews`, {
      method: 'POST',
      body: JSON.stringify({ body, event, comments })
    });
  }
}

module.exports = GiteaClient;