using AutotaskNET;
using AutotaskNET.Entities;

class Program
{
    private const string @USERNAME = "api.user@domain.com";
    private const string @PASSWORD = "P@ssw0rd";
    static void Main(string[] args)
    {
        ATWSInterface atAPI = new ATWSInterface();
        try
        {
            atAPI.Connect(@USERNAME, @PASSWORD);
        }
        catch (Exception e)
        {
            Console.WriteLine($"Error: {e.Message}");
        }
        if (atAPI.IsConnected)
        {
            //use atAPI here
            
        }
    }
}

List<PicklistValue> account_types = atAPI.GetPicklistValues(typeof(Account), "AccountType");

int account_types_customer = account_types.Find(type => type.Label == "Customer").Value;

List<Account> customer_accounts = atAPI.Query(typeof(Account), new List<QueryFilter> {
    new Condition() { FieldName = "AccountType", Operation = "Equals", Value = account_types_customer }
}).OfType<Account>().ToList();

int activity_since = DateTime.Today; //search from the start of today

List<Ticket> tickets_updated_today = atAPI.Query(typeof(Ticket), new List<QueryFilter> {
    new Condition() { FieldName = "LastActivityDate", Operation = "greaterthan", Value = activity_since }
}).OfType<Ticket>().ToList();

int activity_since = DateTime.Today; //search from the start of today

List<Ticket> tickets_updated_today = atAPI.Query(typeof(Ticket), new List<QueryFilter> {
    new ConditionGroup(ConditionGroupOperation.AND) {
        new Condition() { FieldName = "LastActivityDate", Operation = "greaterthan", Value = activity_since }
        new Condition() { FieldName = "Account", Operation = "equals", Value = customer_accounts.Find(account => account.AccountName == "Customer Name").id }
	}
}).OfType<Ticket>().ToList();