using System;
using System.Collections.Generic;
using System.Reflection;
using Centron.BusinessLogic;
using Centron.BusinessLogic.WebServices.Sales.CustomerAssets.AutomaticFactura;
using Centron.Data.Entities.Administration.Logins;
using Centron.Data.WebServices.Sales.Receipts.Invoices;
using Centron.Interfaces.BL;
using Centron.Interfaces.Sales.BillingCenter.Contracts;
using Centron.Tests.EndToEnd.Infrastructure;
using CentronSoftware.Centron.WebServices.Entities.Sales.BillingCenter.Contracts;
using Xunit.Abstractions;

namespace Centron.Tests.EndToEnd.Tests.AutomaticFactura
{
    public class AutomaticFacturaRMMTests : EndToEndTest
    {
        // Test data constants
        private const int TestContractI3D = 1; // Assuming contract with RMM articles exists
        private const int TestCustomerI3D = 10010; // Standard test customer
        private const int TestUserI3D = 11; // Standard test user
        
        public AutomaticFacturaRMMTests(ITestOutputHelper testOutputHelper) : base(testOutputHelper)
        {
            // Ignore dynamic properties that change with each run
            this.Verifier.Settings.IgnoreProperty<ReceiptInvoiceDTO>(f => f.CreatedAt);
            this.Verifier.Settings.IgnoreProperty<ReceiptInvoiceDTO>(f => f.ChangedAt);
            // Note: ReceiptInvoiceItemDTO doesn't have CreatedAt/ChangedAt properties
        }

        public override void Execute()
        {
            // Ignore this test for now
            // SKA : 2025-07-15 : It's a good base for a future unit test. But at the moment it's hard to test the RMM-Functionality
            //                    We have to first encapsulate the call of the external Riverbird Service, so that we can test it 
            
            
            // this.PrepareDatabase();
            //
            // // Test single interval (fallback case)
            // this.TestSingleIntervalRMM();
            //
            // // Test multiple intervals (new functionality)
            // this.TestMultipleIntervalsRMM();
        }

        private void PrepareDatabase()
        {
            // Ensure we have test data for RMM functionality
            // This would typically involve setting up contract article references, etc.
            using (var session = new BLSession())
            {
                // Any database preparation needed for RMM testing
                // For now, we'll rely on existing test data
            }
        }

        /// <summary>
        /// Tests the fallback case with a single billing interval.
        /// This should work exactly as before the refactoring.
        /// </summary>
        private void TestSingleIntervalRMM()
        {
            using (var session = new BLSession())
            {
                var loggedInUser = this.GetLoggedInUser(TestUserI3D);

                // Create a billing parameter with single interval
                var billingParam = new ContractToInvoiceParam
                {
                    ContractID = new KeyValuePair<int, string>(TestContractI3D, "Test Contract"),
                    InvoiceFrom = DateTime.Today.AddDays(-30),
                    InvoiceTo = DateTime.Today,
                    InvoiceIntervalCount = 1, // Single interval
                    BillingIntervalKind = BillingIntervalKinds.Monthly,
                    BillingIntervalDuration = 1
                };

                // Create a test invoice
                var invoice = this.CreateTestInvoice(session, loggedInUser);
                
                // Add RMM placeholder to test removal and replacement
                this.AddRMMPlaceholderToInvoice(invoice);

                var automaticFacturaWebServiceBL = session.GetBL<AutomaticFacturaWebServiceBL>();
                
                // This is the method we're testing - it should handle single interval correctly
                try
                {
                    // Use reflection to call the private CheckRMMArticle method
                    var checkRMMMethod = typeof(AutomaticFacturaWebServiceBL).GetMethod("CheckRMMArticle",
                        BindingFlags.NonPublic | BindingFlags.Instance);
                    
                    checkRMMMethod?.Invoke(automaticFacturaWebServiceBL, new object[] { invoice, billingParam, loggedInUser });
                    
                    // Verify the result
                    this.Verifier.Verify("SingleInterval_RMM_Invoice", invoice);
                }
                catch (Exception ex)
                {
                    // If RMM service is not available, we expect a specific exception
                    if (ex.InnerException?.GetType().Name == "RMMServiceUnavailableException")
                    {
                        this.Verifier.Verify("SingleInterval_RMM_ServiceUnavailable", ex.InnerException.Message);
                    }
                    else
                    {
                        throw;
                    }
                }
            }
        }

        /// <summary>
        /// Tests the new functionality with multiple billing intervals.
        /// Device counts should be summed across all intervals.
        /// </summary>
        private void TestMultipleIntervalsRMM()
        {
            using (var session = new BLSession())
            {
                var loggedInUser = this.GetLoggedInUser(TestUserI3D);

                // Create billing parameters with multiple intervals
                var billingParam = new ContractToInvoiceParam
                {
                    ContractID = new KeyValuePair<int, string>(TestContractI3D, "Test Contract"),
                    InvoiceFrom = DateTime.Today.AddDays(-60),
                    InvoiceTo = DateTime.Today,
                    InvoiceIntervalCount = 2, // Two intervals
                    BillingIntervalKind = BillingIntervalKinds.Monthly,
                    BillingIntervalDuration = 1
                };

                // Create a test invoice
                var invoice = this.CreateTestInvoice(session, loggedInUser);
                
                // Add RMM placeholder to test removal and replacement
                this.AddRMMPlaceholderToInvoice(invoice);

                var automaticFacturaWebServiceBL = session.GetBL<AutomaticFacturaWebServiceBL>();
                
                try
                {
                    // Use reflection to call the private CheckRMMArticle method
                    var checkRMMMethod = typeof(AutomaticFacturaWebServiceBL).GetMethod("CheckRMMArticle",
                        BindingFlags.NonPublic | BindingFlags.Instance);
                    
                    checkRMMMethod?.Invoke(automaticFacturaWebServiceBL, new object[] { invoice, billingParam, loggedInUser });
                    
                    // Verify the result - should show summed device counts
                    this.Verifier.Verify("MultipleIntervals_RMM_Invoice", invoice);
                }
                catch (Exception ex)
                {
                    // If RMM service is not available, we expect a specific exception
                    if (ex.InnerException?.GetType().Name == "RMMServiceUnavailableException")
                    {
                        this.Verifier.Verify("MultipleIntervals_RMM_ServiceUnavailable", ex.InnerException.Message);
                    }
                    else
                    {
                        throw;
                    }
                }
            }
        }

        /// <summary>
        /// Tests quarterly billing with different BillingIntervalDuration values.
        /// </summary>
        private void TestQuarterlyIntervalsRMM()
        {
            using (var session = new BLSession())
            {
                var loggedInUser = this.GetLoggedInUser(TestUserI3D);

                // Test quarterly billing - Variant 1: BillingIntervalKind=Quarterly, Duration=1
                var billingParamQuarterly = new ContractToInvoiceParam
                {
                    ContractID = new KeyValuePair<int, string>(TestContractI3D, "Test Contract"),
                    InvoiceFrom = DateTime.Today.AddDays(-180),
                    InvoiceTo = DateTime.Today,
                    InvoiceIntervalCount = 2, // Two quarters
                    BillingIntervalKind = BillingIntervalKinds.Quarterly,
                    BillingIntervalDuration = 1
                };

                // Test quarterly billing - Variant 2: BillingIntervalKind=Monthly, Duration=3
                var billingParamMonthly3 = new ContractToInvoiceParam
                {
                    ContractID = new KeyValuePair<int, string>(TestContractI3D, "Test Contract"),
                    InvoiceFrom = DateTime.Today.AddDays(-180),
                    InvoiceTo = DateTime.Today,
                    InvoiceIntervalCount = 2, // Two 3-month periods
                    BillingIntervalKind = BillingIntervalKinds.Monthly,
                    BillingIntervalDuration = 3 // Every 3 months
                };

                var automaticFacturaWebServiceBL = session.GetBL<AutomaticFacturaWebServiceBL>();

                // Test both variants to ensure they produce equivalent results
                this.TestBillingParameterVariant(session, automaticFacturaWebServiceBL, loggedInUser, billingParamQuarterly, "Quarterly_Variant1");
                this.TestBillingParameterVariant(session, automaticFacturaWebServiceBL, loggedInUser, billingParamMonthly3, "Quarterly_Variant2");
            }
        }

        private void TestBillingParameterVariant(BLSession session, AutomaticFacturaWebServiceBL webServiceBL, 
            LoggedInUser loggedInUser, ContractToInvoiceParam billingParam, string testName)
        {
            var invoice = this.CreateTestInvoice(session, loggedInUser);
            this.AddRMMPlaceholderToInvoice(invoice);

            try
            {
                var checkRMMMethod = typeof(AutomaticFacturaWebServiceBL).GetMethod("CheckRMMArticle",
                    BindingFlags.NonPublic | BindingFlags.Instance);
                
                checkRMMMethod?.Invoke(webServiceBL, new object[] { invoice, billingParam, loggedInUser });
                
                this.Verifier.Verify($"{testName}_RMM_Invoice", invoice);
            }
            catch (Exception ex)
            {
                if (ex.InnerException?.GetType().Name == "RMMServiceUnavailableException")
                {
                    this.Verifier.Verify($"{testName}_RMM_ServiceUnavailable", ex.InnerException.Message);
                }
                else
                {
                    throw;
                }
            }
        }

        private ReceiptInvoiceDTO CreateTestInvoice(BLSession session, LoggedInUser loggedInUser)
        {
            // Create a minimal test invoice
            var invoice = new ReceiptInvoiceDTO
            {
                CustomerI3D = TestCustomerI3D,
                Items = new List<ReceiptInvoiceItemDTO>(),
                CreatedAt = DateTime.Now,
                ChangedAt = DateTime.Now
            };

            return invoice;
        }

        private void AddRMMPlaceholderToInvoice(ReceiptInvoiceDTO invoice)
        {
            // Add a placeholder RMM item to test removal and replacement
            var rmmPlaceholderItem = new ReceiptInvoiceItemDTO
            {
                Text = "Test item with @@RMMArtikel@@ placeholder",
                RichText = "Rich text with @@RMMArtikel@@ placeholder",
                QuantityComplete = 1
            };

            invoice.Items.Add(rmmPlaceholderItem);
        }
    }
}