using System;
using System.Collections.Generic;
using System.Linq;
using Centron.BusinessLogic;
using Centron.BusinessLogic.Administration.Settings;
using Centron.BusinessLogic.Sales.CustomerAssets.Contracts;
using Centron.BusinessLogic.Sales.Receipts;
using Centron.BusinessLogic.Sales.Receipts.DataAndResults;
using Centron.BusinessLogic.WebServices.Sales.Receipts;
using Centron.Data.Entities.Sales.Receipts.ContractLists;
using Centron.Interfaces;
using Centron.Interfaces.Administration.Environment;
using Centron.Interfaces.Administration.Settings;
using Centron.Interfaces.BL;
using Centron.Interfaces.Sales.BillingCenter.Contracts;
using Centron.Interfaces.Sales.Receipts;
using Centron.Tests.EndToEnd.Infrastructure;
using CentronSoftware.Centron.WebServices.Entities.Sales.Receipts.ContractLists;
using Xunit.Abstractions;

namespace Centron.Tests.EndToEnd.Tests.Contracts
{
    /// <summary>
    /// End-to-end tests for the ContractBL.CloseContract() method.
    /// Tests the automatic contract closure functionality based on termination/end dates.
    /// </summary>
    public class ContractCloseTests : EndToEndTest
    {
        // Test data constants
        private const int _customerI3D = 10022;
        private const int _testUserI3D = 11;
        private const int _contractKindI3D = 12;

        // Fixed reference date for all tests to ensure deterministic behavior
        private readonly DateTime _referenceDate = new DateTime(2025, 5, 1); // May 1st, 2025

        public ContractCloseTests(ITestOutputHelper testOutputHelper) : base(testOutputHelper)
        {
            // Set to true only when you need to update expected files
            //Verifier.OverrideExpectedFiles = true; // Remove this line after updating expected files
        }

        public override void Execute()
        {
            TestAutomaticClosureDisabled(new BLSession());
            TestAutomatedProlongationContract_ShouldNotClose_WhenTerminationEqualsLastBookingTo(new BLSession());
            TestAutomatedProlongationContract_ShouldClose_WhenTerminationExceeded(new BLSession());
            TestNormalContract_ShouldNotClose_WhenEndDateEqualsLastBookingTo(new BLSession());
            TestNormalContract_ShouldClose_WhenEndDateExceeded(new BLSession());
            TestContract_ShouldNotClose_WhenNoTerminationOrEndDate(new BLSession());
            TestContract_ShouldNotClose_WhenManualCalculation(new BLSession());
            TestBugScenario_ContractBilledOnTerminationDate_ShouldNotCloseUntilNextDay(new BLSession());
        }

        /// <summary>
        /// Test that no contracts are closed when automatic closure is disabled
        /// </summary>
        private void TestAutomaticClosureDisabled(BLSession session)
        {
            // Arrange
            var contractBL = session.GetBL<ContractBL>();
            var settingsBL = session.GetBL<AppSettingsBL>();

            // Disable automatic closure
            var setting = settingsBL.GetSettingsForUpdate(ApplicationSettingID.AutomaticallyCloseExpiredContracts);
            setting.UpdateBool(ApplicationSettingID.AutomaticallyCloseExpiredContracts, false);
            setting.SaveSettings();

            // Create a contract that would normally be closed (termination 10 days before reference date)
            var expiredContract = CreateTestContract(session,
                contractTermination: _referenceDate.AddDays(-10),
                lastBookingTo: _referenceDate.AddDays(-10),
                automatedProlongation: true);

            var contractsBefore = GetActiveContracts(session);

            // Act - pass reference date to CloseContract
            contractBL.CloseContract(_referenceDate);

            // Assert
            var contractsAfter = GetActiveContracts(session);

            Verifier.Verify("AutomaticClosure_Disabled_NoContractsClosed", new
            {
                ContractsBeforeCount = contractsBefore.Count(),
                ContractsAfterCount = contractsAfter.Count(),
                TestContractStillActive = contractsAfter.Any(c => c.I3D == expiredContract.I3D)
            });

            // Cleanup
            CleanupTestContract(session, expiredContract.I3D);
        }

        /// <summary>
        /// Test that automated prolongation contracts should NOT close when termination equals LastBookingTo
        /// but the termination date has not been reached yet (future date)
        /// This tests the specific bug fix where contracts were closing prematurely
        /// </summary>
        private void TestAutomatedProlongationContract_ShouldNotClose_WhenTerminationEqualsLastBookingTo(BLSession session)
        {
            // Arrange
            var contractBL = session.GetBL<ContractBL>();
            var settingsBL = session.GetBL<AppSettingsBL>();

            // Enable automatic closure
            var setting = settingsBL.GetSettingsForUpdate(ApplicationSettingID.AutomaticallyCloseExpiredContracts);
            setting.UpdateBool(ApplicationSettingID.AutomaticallyCloseExpiredContracts, true);
            setting.SaveSettings();

            // Termination date is in the future (30 days after reference date)
            var terminationDate = _referenceDate.AddDays(30);
            var testContract = CreateTestContract(session,
                contractTermination: terminationDate,
                lastBookingTo: terminationDate, // Fully billed, but termination date not reached yet
                automatedProlongation: true);

            // Act - pass reference date to CloseContract
            contractBL.CloseContract(_referenceDate);

            // Assert
            var contractAfter = GetContractById(session, testContract.I3D);

            Verifier.Verify("AutomatedProlongation_NotClosed_WhenTerminationEqualsLastBookingTo", new
            {
                ContractI3D = testContract.I3D,
                ContractState = contractAfter?.State.ToString(),
                ContractTermination = testContract.ContractTermination?.ToString("yyyy-MM-dd"),
                LastBookingTo = testContract.LastBookingTo?.ToString("yyyy-MM-dd"),
                ReferenceDate = _referenceDate.ToString("yyyy-MM-dd"),
                AutomatedProlongation = testContract.AutomatedProlongation,
                ShouldRemainActive = contractAfter?.State == ReceiptState.Active,
                Reason = "Termination date is in the future, contract should remain active"
            });

            // Cleanup
            CleanupTestContract(session, testContract.I3D);
        }

        /// <summary>
        /// Test that automated prolongation contracts should close when termination is exceeded
        /// and reference date is after the termination date
        /// </summary>
        private void TestAutomatedProlongationContract_ShouldClose_WhenTerminationExceeded(BLSession session)
        {
            // Arrange
            var contractBL = session.GetBL<ContractBL>();
            var settingsBL = session.GetBL<AppSettingsBL>();

            // Enable automatic closure
            var setting = settingsBL.GetSettingsForUpdate(ApplicationSettingID.AutomaticallyCloseExpiredContracts);
            setting.UpdateBool(ApplicationSettingID.AutomaticallyCloseExpiredContracts, true);
            setting.SaveSettings();

            // Termination date is in the past (10 days before reference date)
            var terminationDate = _referenceDate.AddDays(-10);
            var testContract = CreateTestContract(session,
                contractTermination: terminationDate,
                lastBookingTo: terminationDate, // Fully billed and termination date passed
                automatedProlongation: true);

            // Act - pass reference date to CloseContract
            contractBL.CloseContract(_referenceDate);

            // Assert
            var contractAfter = GetContractById(session, testContract.I3D);

            Verifier.Verify("AutomatedProlongation_Closed_WhenTerminationExceeded", new
            {
                ContractI3D = testContract.I3D,
                ContractState = contractAfter?.State.ToString(),
                ContractTermination = testContract.ContractTermination?.ToString("yyyy-MM-dd"),
                LastBookingTo = testContract.LastBookingTo?.ToString("yyyy-MM-dd"),
                ReferenceDate = _referenceDate.ToString("yyyy-MM-dd"),
                AutomatedProlongation = testContract.AutomatedProlongation,
                ShouldBeClosed = contractAfter?.State == ReceiptState.Completed,
                Reason = "Termination date is in the past and contract is fully billed"
            });

            // Cleanup
            CleanupTestContract(session, testContract.I3D);
        }

        /// <summary>
        /// Test that normal contracts should NOT close when end date equals LastBookingTo
        /// but the end date has not been reached yet (future date)
        /// </summary>
        private void TestNormalContract_ShouldNotClose_WhenEndDateEqualsLastBookingTo(BLSession session)
        {
            // Arrange
            var contractBL = session.GetBL<ContractBL>();
            var settingsBL = session.GetBL<AppSettingsBL>();

            // Enable automatic closure
            var setting = settingsBL.GetSettingsForUpdate(ApplicationSettingID.AutomaticallyCloseExpiredContracts);
            setting.UpdateBool(ApplicationSettingID.AutomaticallyCloseExpiredContracts, true);
            setting.SaveSettings();

            // End date is in the future (30 days after reference date)
            var endDate = _referenceDate.AddDays(30);
            var testContract = CreateTestContract(session,
                contractEnd: endDate,
                lastBookingTo: endDate, // Fully billed, but end date not reached yet
                automatedProlongation: false);

            // Act - pass reference date to CloseContract
            contractBL.CloseContract(_referenceDate);

            // Assert
            var contractAfter = GetContractById(session, testContract.I3D);

            Verifier.Verify("NormalContract_NotClosed_WhenEndDateEqualsLastBookingTo", new
            {
                ContractI3D = testContract.I3D,
                ContractState = contractAfter?.State.ToString(),
                ContractEnd = testContract.ContractEnd?.ToString("yyyy-MM-dd"),
                LastBookingTo = testContract.LastBookingTo?.ToString("yyyy-MM-dd"),
                ReferenceDate = _referenceDate.ToString("yyyy-MM-dd"),
                AutomatedProlongation = testContract.AutomatedProlongation,
                ShouldRemainActive = contractAfter?.State == ReceiptState.Active,
                Reason = "End date is in the future, contract should remain active"
            });

            // Cleanup
            CleanupTestContract(session, testContract.I3D);
        }

        /// <summary>
        /// Test that normal contracts should close when end date is exceeded
        /// and reference date is after the end date
        /// </summary>
        private void TestNormalContract_ShouldClose_WhenEndDateExceeded(BLSession session)
        {
            // Arrange
            var contractBL = session.GetBL<ContractBL>();
            var settingsBL = session.GetBL<AppSettingsBL>();

            // Enable automatic closure
            var setting = settingsBL.GetSettingsForUpdate(ApplicationSettingID.AutomaticallyCloseExpiredContracts);
            setting.UpdateBool(ApplicationSettingID.AutomaticallyCloseExpiredContracts, true);
            setting.SaveSettings();

            // End date is in the past (10 days before reference date)
            var endDate = _referenceDate.AddDays(-10);
            var testContract = CreateTestContract(session,
                contractEnd: endDate,
                lastBookingTo: endDate, // Fully billed and end date passed
                automatedProlongation: false);

            // Act - pass reference date to CloseContract
            contractBL.CloseContract(_referenceDate);

            // Assert
            var contractAfter = GetContractById(session, testContract.I3D);

            Verifier.Verify("NormalContract_Closed_WhenEndDateExceeded", new
            {
                ContractI3D = testContract.I3D,
                ContractState = contractAfter?.State.ToString(),
                ContractEnd = testContract.ContractEnd?.ToString("yyyy-MM-dd"),
                LastBookingTo = testContract.LastBookingTo?.ToString("yyyy-MM-dd"),
                ReferenceDate = _referenceDate.ToString("yyyy-MM-dd"),
                AutomatedProlongation = testContract.AutomatedProlongation,
                ShouldBeClosed = contractAfter?.State == ReceiptState.Completed,
                Reason = "End date is in the past and contract is fully billed"
            });

            // Cleanup
            CleanupTestContract(session, testContract.I3D);
        }

        /// <summary>
        /// Test that contracts without termination or end date are not processed
        /// </summary>
        private void TestContract_ShouldNotClose_WhenNoTerminationOrEndDate(BLSession session)
        {
            // Arrange
            var contractBL = session.GetBL<ContractBL>();
            var settingsBL = session.GetBL<AppSettingsBL>();

            // Enable automatic closure
            var setting = settingsBL.GetSettingsForUpdate(ApplicationSettingID.AutomaticallyCloseExpiredContracts);
            setting.UpdateBool(ApplicationSettingID.AutomaticallyCloseExpiredContracts, true);
            setting.SaveSettings();

            var testContract = CreateTestContract(session,
                contractTermination: null,
                contractEnd: null,
                lastBookingTo: _referenceDate.AddDays(10),
                automatedProlongation: true);

            // Act - pass reference date to CloseContract
            contractBL.CloseContract(_referenceDate);

            // Assert
            var contractAfter = GetContractById(session, testContract.I3D);

            Verifier.Verify("Contract_NotProcessed_WhenNoTerminationOrEndDate", new
            {
                ContractI3D = testContract.I3D,
                ContractState = contractAfter?.State.ToString(),
                HasContractTermination = testContract.ContractTermination.HasValue,
                HasContractEnd = testContract.ContractEnd.HasValue,
                ShouldRemainActive = contractAfter?.State == ReceiptState.Active
            });

            // Cleanup
            CleanupTestContract(session, testContract.I3D);
        }

        /// <summary>
        /// Test the specific bug scenario from the bug report:
        /// Contract is billed on the termination date, but should not close until the next day
        /// Bug: Contract was closed on 14.04 when LastBookingTo was 30.04 and TerminationDate was 30.04
        /// Expected: Contract should only close on 01.05 (day after termination date)
        /// </summary>
        private void TestBugScenario_ContractBilledOnTerminationDate_ShouldNotCloseUntilNextDay(BLSession session)
        {
            // Arrange
            var contractBL = session.GetBL<ContractBL>();
            var settingsBL = session.GetBL<AppSettingsBL>();

            // Enable automatic closure
            var setting = settingsBL.GetSettingsForUpdate(ApplicationSettingID.AutomaticallyCloseExpiredContracts);
            setting.UpdateBool(ApplicationSettingID.AutomaticallyCloseExpiredContracts, true);
            setting.SaveSettings();

            // Simulate the bug scenario: Contract termination is 10 days after reference date
            // and it's already billed up to that date
            var terminationDate = _referenceDate.AddDays(10);
            var testContract = CreateTestContract(session,
                contractTermination: terminationDate,
                lastBookingTo: terminationDate, // Billed on termination date (like 30.04)
                automatedProlongation: true);

            // Act - Run on the reference date (which is before termination date)
            contractBL.CloseContract(_referenceDate);

            // Assert
            var contractAfter = GetContractById(session, testContract.I3D);

            Verifier.Verify("BugScenario_ContractNotClosedWhenBilledOnTerminationDate", new
            {
                ContractI3D = testContract.I3D,
                ContractState = contractAfter?.State.ToString(),
                ContractTermination = testContract.ContractTermination?.ToString("yyyy-MM-dd"),
                LastBookingTo = testContract.LastBookingTo?.ToString("yyyy-MM-dd"),
                ReferenceDate = _referenceDate.ToString("yyyy-MM-dd"),
                DaysUntilTermination = (terminationDate - _referenceDate).Days,
                ShouldRemainActive = contractAfter?.State == ReceiptState.Active,
                Reason = "Contract is fully billed but termination date not yet reached - should remain active"
            });

            // Cleanup
            CleanupTestContract(session, testContract.I3D);
        }

        /// <summary>
        /// Test that manual calculation contracts are not processed
        /// </summary>
        private void TestContract_ShouldNotClose_WhenManualCalculation(BLSession session)
        {
            // Arrange
            var contractBL = session.GetBL<ContractBL>();
            var settingsBL = session.GetBL<AppSettingsBL>();

            // Enable automatic closure
            var setting = settingsBL.GetSettingsForUpdate(ApplicationSettingID.AutomaticallyCloseExpiredContracts);
            setting.UpdateBool(ApplicationSettingID.AutomaticallyCloseExpiredContracts, true);
            setting.SaveSettings();

            var testContract = CreateTestContract(session,
                contractTermination: _referenceDate.AddDays(-10),
                lastBookingTo: _referenceDate.AddDays(-10),
                automatedProlongation: true,
                calculationKind: ContractCalculationKind.Manual); // Manual calculation

            // Act - pass reference date to CloseContract
            contractBL.CloseContract(_referenceDate);

            // Assert
            var contractAfter = GetContractById(session, testContract.I3D);

            Verifier.Verify("Contract_NotProcessed_WhenManualCalculation", new
            {
                ContractI3D = testContract.I3D,
                ContractState = contractAfter?.State.ToString(),
                CalculationKind = testContract.CalculationKind.ToString(),
                ShouldRemainActive = contractAfter?.State == ReceiptState.Active
            });

            // Cleanup
            CleanupTestContract(session, testContract.I3D);
        }

        #region Helper Methods

        /// <summary>
        /// Creates a test contract with specified parameters
        /// </summary>
        private ReceiptContract CreateTestContract(BLSession session,
            DateTime? contractTermination = null,
            DateTime? contractEnd = null,
            DateTime? lastBookingTo = null,
            bool automatedProlongation = true,
            ContractCalculationKind calculationKind = ContractCalculationKind.Auto)
        {
            var loggedInUser = this.GetLoggedInUser(_testUserI3D);
            var receiptWebServiceBL = session.GetBL<ReceiptWebServiceBL>();

            // Create new contract
            var result = receiptWebServiceBL.CreateNewReceipt(
                CentronObjectKindNumeric.ContractClass,
                loggedInUser,
                _customerI3D,
                new CreateReceiptData(),
                null, null, true, false, true);

            var contractDTO = (ReceiptContractDTO)result.Data.Receipt;

            // Set contract properties
            contractDTO.ContractKindI3D = _contractKindI3D;
            contractDTO.CalculationKind = calculationKind;
            contractDTO.AutomatedProlongation = automatedProlongation;
            contractDTO.ContractTermination = contractTermination;
            contractDTO.ContractEnd = contractEnd;
            contractDTO.FirstPaidDate = DateTime.Now.AddDays(-30);

            // Save the contract
            var saveResult = receiptWebServiceBL.SaveReceipt(contractDTO, loggedInUser.User,
                new SaveReceiptData { IgnoreCallbacks = true }, false, CreatedThroughApplication.CentronNet, null);

            if (saveResult.Status != ResultStatus.Success)
            {
                throw new InvalidOperationException($"Failed to create test contract: {saveResult.Message}");
            }

            // Update LastBookingTo if specified (this needs to be done after saving)
            if (lastBookingTo.HasValue)
            {
                var receiptBL = session.GetBL<ReceiptBL>();
                var contract = receiptBL.GetReceiptByI3D<ReceiptContract>(saveResult.Data.Receipt.I3D);
                contract.LastBookingTo = lastBookingTo;
                receiptBL.SaveReceipt(contract, loggedInUser.User,
                    new SaveReceiptData { IgnoreCallbacks = true }, false, CreatedThroughApplication.CentronNet);
            }

            return session.GetBL<ReceiptBL>().GetReceiptByI3D<ReceiptContract>(saveResult.Data.Receipt.I3D);
        }

        /// <summary>
        /// Gets all active contracts
        /// </summary>
        private List<ReceiptContract> GetActiveContracts(BLSession session)
        {
            var receiptBL = session.GetBL<ReceiptBL>();
            return receiptBL.GetReceipts<ReceiptContract>(f => f.State == ReceiptState.Active).ToList();
        }

        /// <summary>
        /// Gets a contract by ID
        /// </summary>
        private ReceiptContract GetContractById(BLSession session, int contractI3D)
        {
            var receiptBL = session.GetBL<ReceiptBL>();
            return receiptBL.GetReceiptByI3D<ReceiptContract>(contractI3D);
        }

        /// <summary>
        /// Cleans up test contract
        /// </summary>
        private void CleanupTestContract(BLSession session, int contractI3D)
        {
            try
            {
                var receiptBL = session.GetBL<ReceiptBL>();
                var contract = this.GetContractById(session, contractI3D);
                if (contract != null)
                {
                    var loggedInUser = this.GetLoggedInUser(_testUserI3D);
                    contract.State = ReceiptState.Completed;
                    receiptBL.SaveReceipt(contract, loggedInUser.User,
                        new SaveReceiptData { IgnoreCallbacks = true }, false, CreatedThroughApplication.CentronNet);
                }
            }
            catch
            {
                // Ignore cleanup errors in tests
            }
        }

        #endregion
    }
}