import type { AuthorizationServer } from "oauth4webapi";
import type { AccountInfo, OAuth2Provider, ProviderOptions } from "../types";

const authorization_server: AuthorizationServer = {
  issuer: "https://www.facebook.com",
  authorization_endpoint: "https://www.facebook.com/v19.0/dialog/oauth",
  token_endpoint: "https://graph.facebook.com/oauth/access_token",
  userinfo_endpoint:
    "https://graph.facebook.com/me?fields=id,name,email,picture",
};

export function FacebookAuthProvider(config: ProviderOptions): OAuth2Provider {
  return {
    ...config,
    id: "facebook",
    scope: "email",
    authorization_server,
    name: "Facebook",
    protocol: "OAuth2",
    profileCallback: (profile): AccountInfo => {
      let picture = "";

      if (typeof profile.picture === "object" && profile.picture !== null) {
        // Type assertion
        const dataContainer = profile.picture as { data: { url: string } };
        if ("data" in dataContainer) {
          picture = dataContainer.data.url;
        }
      }
      return {
        sub: profile.id as string,
        name: profile.name as string,
        email: profile.email as string,
        picture: picture,
      };
    },
  };
}

export default FacebookAuthProvider;