// Validate input format
let tokenFormat = /^[a-zA-Z0-9_-]+$/;
let accessToken = metadata.account.apikey;

if (tokenFormat.test(accessToken)) {
    httprequest.addHeader('Accept', 'application/json');
    httprequest.addHeader('Authorization', `Bearer ${accessToken}`);
    
    // Test authentication with a simple API call
    let res = httprequest.get('https://api.example.com/test');
    let statusCode = httprequest.getStatusCode();
    
    if (statusCode === 200) {
        auth.authenticationSuccess();
    } else {
        auth.authenticationFailed('Authentication failed. Please check your credentials.');
    }
} else {
    auth.authenticationFailed('Invalid token format.');
}

// Set headers
httprequest.addHeader('Accept', 'application/json');
httprequest.addHeader('Authorization', `Bearer ${metadata.account.apikey}`);

// Determine endpoint based on report selection
let endpoint = '';
switch(metadata.report) {
    case 'Report1':
        endpoint = 'https://api.example.com/data1';
        break;
    case 'Report2':
        endpoint = 'https://api.example.com/data2';
        break;
}

// Fetch and process data with pagination
let URL = endpoint;
do {
    let res = httprequest.get(URL);
    let statusCode = httprequest.getStatusCode();
    
    if (statusCode !== 200) {
        throw new Error(`API request failed: ${statusCode}`);
    }
    
    let responseData = JSON.parse(res);
    
    // Parse JSON array into Domo dataset
    datagrid.magicParseJSON(responseData.results);
    
    // Handle pagination
    URL = responseData.paging?.next?.link || false;
} while (URL);

try {
    let res = httprequest.get(url);
    let statusCode = httprequest.getStatusCode();
    
    if (statusCode !== 200) {
        let errorMsg = `Request failed: ${statusCode}`;
        try {
            let errorData = JSON.parse(res);
            if (errorData.message) {
                errorMsg = errorData.message;
            }
        } catch (e) {
            errorMsg += `. Response: ${res.substring(0, 200)}`;
        }
        throw new Error(errorMsg);
    }
    
    // Process successful response
    let data = JSON.parse(res);
    datagrid.magicParseJSON(data.results);
    
} catch (error) {
    // Handle error appropriately
    throw error;
}