import { Client } from '@microsoft/microsoft-graph-client';

// Bun-native env loader
async function loadEnv(filePath: string) {
  const file = Bun.file(filePath);
  if (!(await file.exists())) {
    console.warn(`⚠ Env file not found: ${filePath}`);
    return;
  }
  const text = await file.text();
  for (const line of text.split('\n')) {
    const trimmed = line.trim();
    if (!trimmed || trimmed.startsWith('#')) continue;
    const eqIndex = trimmed.indexOf('=');
    if (eqIndex === -1) continue;
    const key = trimmed.slice(0, eqIndex).trim();
    let value = trimmed.slice(eqIndex + 1).trim();
    if ((value.startsWith('"') && value.endsWith('"')) || (value.startsWith("'") && value.endsWith("'"))) {
      value = value.slice(1, -1);
    }
    process.env[key] = value;
  }
}

await loadEnv('/home/admin/secrets/.env');

async function getGraphToken() {
  const tokenEndpoint = `https://login.microsoftonline.com/${process.env.TENANT_ID}/oauth2/v2.0/token`;
  const params = new URLSearchParams();
  params.append('client_id', process.env.CLIENT_ID!);
  params.append('client_secret', process.env.CLIENT_SECRET!);
  params.append('scope', 'https://graph.microsoft.com/.default');
  params.append('grant_type', 'client_credentials');

  const response = await fetch(tokenEndpoint, {
    method: 'POST',
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
    body: params,
  });

  const data = await response.json();
  return data.access_token;
}

async function inspectTables() {
  const token = await getGraphToken();
  const client = Client.init({
    authProvider: (done) => {
      done(null, token);
    },
  });

  const driveId = process.env.DRIVE_ID;
  const itemId = process.env.ITEM_ID;
  const baseUrl = `/drives/${driveId}/items/${itemId}/workbook/tables`;

  console.log(`Inspecting tables in file: ${itemId}`);
  
  try {
    const res = await client.api(baseUrl).get();
    const tables = res.value;
    
    for (const table of tables) {
      console.log(`\nTable: ${table.name}`);
      const cols = await client.api(`${baseUrl}/${table.name}/columns`).get();
      console.log(`- Column count: ${cols.value.length}`);
    }
  } catch (err) {
    console.error('Error:', err.message);
  }
}

inspectTables();