using System;
using System.Linq;
using WNPayroll.TaxCalcs;
using WNPayroll.Zenith.Models.Data.Payroll;
using Xunit;
using Zenith.Business.Engine;
using Zenith.Models.Data.Payroll.PayData;
using SubTaxType = WNPayroll.Zenith.Models.Data.Enums.SubTaxType;

namespace Zenith.UnitTests.Test_Cases
{
    public class FUTATests
    {
        private readonly PayrollEngineV2 Engine = new PayrollEngineV2();
        private ZenithPayrollData PD = new ZenithPayrollData();

        private readonly Boolean W42020Tests = false;
        private readonly States StateTested = States.CA;

        /*  Monthly = 1
         *  Semi-weekly = 2   */
        private readonly short Default_FederalTaxDueFrequency = 1;

        [Fact]
        public void P53()
        {
            PD = TestDefaults.ResetPayrollData(StateTested);

            PD.Employees[0].PayDataRecords[0] = TestDefaults.DefaultRecord(25, 40);

            //  CA State
            PD.Employees[0].StateTaxes.Add(new EmployeeStateTax()
            {
                TaxID = 2,
                State = StateTested,
                CompanyTaxDueFrequency = Default_FederalTaxDueFrequency
            });

            //  Allowances and filing status are stored in Parameters in EmployeeStateTax class so we have to add them here outside
            //  Parameters is a list of decimals (later cast into their appropriate types, sensitive to list index)

            /*  Filing Status: SingleOrMarriedMultipleIncomes = 1, MarriedOneIncome = 2, HeadOfHousehold = 4  */
            PD.Employees[0].StateTaxes[0].Parameters.Add(1);
            /*  Allowances  */
            PD.Employees[0].StateTaxes[0].Parameters.Add(0);
            /*  Additional allowances   */
            PD.Employees[0].StateTaxes[0].Parameters.Add(0);
            /*  Additional withholding  */
            PD.Employees[0].StateTaxes[0].Parameters.Add(0);
            /*  Exempt from State tax: false=0, true=1  */
            PD.Employees[0].StateTaxes[0].Parameters.Add(0);

            //  Federal
            PD.Employees[0].FederalTaxes[0] = new EmployeeFederalTax()
            {
                TaxID = 1,
                FilingStatus = (short)FederalTaxCalcs.FilingStatus.Single,
                Allowances = 0,
                SubTaxType = SubTaxType.FederalTax,

                CompanyTaxDueFrequency = Default_FederalTaxDueFrequency,
                SUTAState = StateTested,
                IsW42020OrLater = W42020Tests,
            };

            //  FUTA
            //  Note the index number. If we left it at 0, it'd just overwrite the previous Federal tax object.
            PD.Employees[0].FederalTaxes.Add(new EmployeeFederalTax()
            {
                TaxID = 3,
                FilingStatus = (short)FederalTaxCalcs.FilingStatus.Single,
                Allowances = 0,
                SubTaxType = SubTaxType.FUTA,

                CompanyTaxDueFrequency = Default_FederalTaxDueFrequency,
                SUTAState = StateTested,
                IsW42020OrLater = W42020Tests,
            });

            var results = Engine.Process(PD);

            Assert.Equal(1000m, results.First().GrossPay, 0);
            Assert.Equal(6m, results.First().PayrollTaxes.Find(x => x.TaxID == 3).CompanyAmount, 0);
        }
    }
}