import type { OAuth2Adapter, OAuth2UserInfo } from "adminforth";


import type { GithubEmail } from "./types.js";
export default class AdminForthAdapterGithubOauth2 implements OAuth2Adapter {
    private clientID: string;
    private clientSecret: string;
  
    constructor(options: {
      clientID: string;
      clientSecret: string;
    }) {
      this.clientID = options.clientID;
      this.clientSecret = options.clientSecret;
    }
  
    getAuthUrl(): string {
      const params = new URLSearchParams({
        client_id: this.clientID,
        scope: 'user:email read:user',
        allow_signup: 'true',
        provider: this.constructor.name
      });
      const url = `https://github.com/login/oauth/authorize?${params.toString()}`;
      return url;
    }
  
    async getTokenFromCode(code: string, redirect_uri: string): Promise<OAuth2UserInfo> {
      // Exchange code for token
      const tokenResponse = await fetch('https://github.com/login/oauth/access_token', {
        method: 'POST',
        headers: { 
          'Accept': 'application/json',
          'Content-Type': 'application/json'
        },
        body: JSON.stringify({
          code,
          client_id: this.clientID,
          client_secret: this.clientSecret,
          redirect_uri,
        }),
      });
  
      const tokenData = await tokenResponse.json();
  
      if (tokenData.error) {
        console.error('Token error:', tokenData);
        throw new Error(tokenData.error_description || tokenData.error);
      }
  
      // Get user info using access token
      const userResponse = await fetch('https://api.github.com/user', {
        headers: { 
          'Authorization': `Bearer ${tokenData.access_token}`,
          'Accept': 'application/vnd.github.v3+json'
        },
      });
  
      const userData = await userResponse.json();
  
      if (userData.error) {
        throw new Error(userData.error_description || userData.error);
      }

      // If email is not public, fetch email separately
      if (!userData.email) {
        const emailResponse = await fetch('https://api.github.com/user/emails', {
          headers: { 
            'Authorization': `Bearer ${tokenData.access_token}`,
            'Accept': 'application/vnd.github.v3+json'
          },
        });
        
        const emails: GithubEmail[] = await emailResponse.json();
        const primaryEmail = emails.find((email: GithubEmail) => email.primary);
        userData.email = primaryEmail?.email;
      }
  
      return {
        provider: this.constructor.name,
        subject: `${userData.id}`,
        email: userData.email,
        profilePictureUrl: userData.avatar_url,
        fullName: userData.name
      };
    }

    getName(): string {
      return 'GitHub';
    }

    getIcon(): string {
      return `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 98 98"><path fill-rule="evenodd" clip-rule="evenodd" d="M48.854 0C21.839 0 0 22 0 49.217c0 21.756 13.993 40.172 33.405 46.69 2.427.49 3.316-1.059 3.316-2.362 0-1.141-.08-5.052-.08-9.127-13.59 2.934-16.42-5.867-16.42-5.867-2.184-5.704-5.42-7.17-5.42-7.17-4.448-3.015.324-3.015.324-3.015 4.934.326 7.523 5.052 7.523 5.052 4.367 7.496 11.404 5.378 14.235 4.074.404-3.178 1.699-5.378 3.074-6.6-10.839-1.141-22.243-5.378-22.243-24.283 0-5.378 1.94-9.778 5.014-13.2-.485-1.222-2.184-6.275.486-13.038 0 0 4.125-1.304 13.426 5.052a46.97 46.97 0 0 1 12.214-1.63c4.125 0 8.33.571 12.213 1.63 9.302-6.356 13.427-5.052 13.427-5.052 2.67 6.763.97 11.816.485 13.038 3.155 3.422 5.015 7.822 5.015 13.2 0 18.905-11.404 23.06-22.324 24.283 1.78 1.548 3.316 4.481 3.316 9.126 0 6.6-.08 11.897-.08 13.526 0 1.304.89 2.853 3.316 2.364 19.412-6.52 33.405-24.935 33.405-46.691C97.707 22 75.788 0 48.854 0z" style="fill: currentColor"/></svg>`;
    }
}