const { PublicClientApplication } = require('@azure/msal-node');
const { msalConfig, graphScopes } = require('./authConfig');
const fetch = (...args) => 
  import('node-fetch').then(({default: fetch}) => fetch(...args));

class GraphHelper {
    constructor() {
        this.pca = new PublicClientApplication(msalConfig);
    }

    async getAccessToken() {
        const accounts = await this.pca.getTokenCache().getAllAccounts();
        if (accounts.length > 0) {
            try {
                return await this.pca.acquireTokenSilent({
                    account: accounts[0],
                    scopes: graphScopes
                });
            } catch (error) {
                return this.login();
            }
        }
        return this.login();
    }

    async login() {
        return this.pca.acquireTokenInteractive({
            scopes: graphScopes,
            openBrowser: async (url) => {
                const { shell } = require('electron');
                await shell.openExternal(url);
            }
        });
    }

    async listFolderContents(folderPath) {
        const token = await this.getAccessToken();
        const response = await fetch(`https://graph.microsoft.com/v1.0/me/drive/root:${folderPath}:/children`, {
            headers: {
                Authorization: `Bearer ${token.accessToken}`
            }
        });
        return response.json();
    }
}

module.exports = new GraphHelper();