using System;
using Centron.BusinessLogic;
using Centron.BusinessLogic.WebServices.Sales.Receipts.MasterDataLists;
using Centron.Tests.EndToEnd.Infrastructure;
using Xunit.Abstractions;

namespace Centron.Tests.EndToEnd.Tests.MasterDataList
{
    /// <summary>
    /// Regression tests for ticket 163981 — removing or replacing the main device's
    /// serial number on a Stammblatt and propagating the change to its click counters.
    /// </summary>
    public class MainDeviceSerialNumberTests : EndToEndTest
    {
        public MainDeviceSerialNumberTests(ITestOutputHelper testOutputHelper)
            : base(testOutputHelper)
        {
        }

        public override void Execute()
        {
            this.RemoveMainDeviceSerialNumber_NoCounters();
            this.RemoveMainDeviceSerialNumber_WithCounters_Fails();
            this.SwapMainDeviceSerialNumber_WithCounters_UpdatesAll();
        }

        private void RemoveMainDeviceSerialNumber_NoCounters()
        {
            // Find a Stammblatt with a serial number but no active click counters.
            // Use the MasterDataList view so the test sees the same SerialNumberI3D the BL does
            // (the view derives it from Barcode.Status = 9, not from GeraeteKopf.SeriennummerI3D).
            var masterDataListI3D = this.Sql<int>(@"
                SELECT TOP 1 mdl.I3D
                FROM MasterDataList mdl
                WHERE mdl.SerialNumberI3D > 0
                  AND NOT EXISTS (
                      SELECT 1 FROM GeraeteClickZaehler gz
                      WHERE gz.GeraeteKopfI3D = mdl.I3D AND gz.SeriennummerI3D = mdl.SerialNumberI3D AND gz.Status = 1
                  )
                ORDER BY mdl.I3D");

            if (masterDataListI3D <= 0)
                throw new InvalidOperationException("Precondition failed: no master data list with a serial number and without active click counters found.");

            var oldSerialNumber = this.Sql<string>($"SELECT SerialNumber FROM MasterDataList WHERE I3D = {masterDataListI3D}");
            var historyCutoffI3D = this.GetCurrentMaxHistoryI3D();

            using var bl = new BLSession();
            var loggedInUser = this.GetLoggedInUser();

            var result = bl.GetBL<MasterDataListWebServiceBL>().RemoveMainDeviceSerialNumber(masterDataListI3D, loggedInUser);

            this.Verifier.Verify("RemoveMainDeviceSerialNumber_NoCounters_Result", result);
            this.Verifier.VerifySql(
                "RemoveMainDeviceSerialNumber_NoCounters_Db",
                $"SELECT I3D, SeriennummerI3D, Seriennummer FROM GeraeteKopf WHERE I3D = {masterDataListI3D}");
            this.Verifier.VerifySql(
                "RemoveMainDeviceSerialNumber_NoCounters_History",
                BuildSerialNumberHistoryQuery(
                    masterDataListI3D,
                    historyCutoffI3D,
                    loggedInUser.User.Employee.I3D,
                    $"Seriennummer vom Hauptgerät \"{oldSerialNumber}\" wurde entfernt"));
        }

        private void RemoveMainDeviceSerialNumber_WithCounters_Fails()
        {
            // Find a Stammblatt with a serial number that still has active counters referencing it.
            var masterDataListI3D = this.Sql<int>(@"
                SELECT TOP 1 mdl.I3D
                FROM MasterDataList mdl
                INNER JOIN GeraeteClickZaehler gz ON gz.GeraeteKopfI3D = mdl.I3D AND gz.SeriennummerI3D = mdl.SerialNumberI3D AND gz.Status = 1
                WHERE mdl.SerialNumberI3D > 0
                ORDER BY mdl.I3D");

            if (masterDataListI3D <= 0)
                throw new InvalidOperationException("Precondition failed: no master data list with a serial number and active click counters found.");

            using var bl = new BLSession();
            var loggedInUser = this.GetLoggedInUser();

            var result = bl.GetBL<MasterDataListWebServiceBL>().RemoveMainDeviceSerialNumber(masterDataListI3D, loggedInUser);

            this.Verifier.Verify("RemoveMainDeviceSerialNumber_WithCounters_Fails_Result", new
            {
                result.Status,
                result.Message
            });
        }

        private void SwapMainDeviceSerialNumber_WithCounters_UpdatesAll()
        {
            // Find a Stammblatt with serial + active counters AND for which a different in-stock barcode
            // (state = 1) for the same article exists — both must hold for the swap to be exercisable.
            var masterDataListI3D = this.Sql<int>(@"
                SELECT TOP 1 mdl.I3D
                FROM MasterDataList mdl
                INNER JOIN MasterDataListItems mi ON mi.HeadI3D = mdl.I3D AND mi.IsMainItem = 1
                INNER JOIN GeraeteClickZaehler gz ON gz.GeraeteKopfI3D = mdl.I3D AND gz.SeriennummerI3D = mdl.SerialNumberI3D AND gz.Status = 1
                WHERE mdl.SerialNumberI3D > 0
                  AND EXISTS (
                      SELECT 1 FROM Barcode b
                      WHERE b.ArtikelI3D = mi.ArticleI3D
                        AND b.Status = 1
                        AND b.I3D <> mdl.SerialNumberI3D
                  )
                ORDER BY mdl.I3D");

            if (masterDataListI3D <= 0)
                throw new InvalidOperationException("Precondition failed: no master data list with a serial number, active click counters, and an alternative in-stock barcode for the main item's article found.");

            // Pick the first available in-stock barcode (state = 1) that matches the main item's article.
            var newSerialNumberI3D = this.Sql<int>($@"
                SELECT TOP 1 b.I3D
                FROM Barcode b
                INNER JOIN MasterDataList mdl ON mdl.I3D = {masterDataListI3D}
                INNER JOIN MasterDataListItems mi ON mi.HeadI3D = mdl.I3D AND mi.IsMainItem = 1
                WHERE b.ArtikelI3D = mi.ArticleI3D
                  AND b.Status = 1
                  AND b.I3D <> mdl.SerialNumberI3D
                ORDER BY b.I3D");

            if (newSerialNumberI3D <= 0)
                throw new InvalidOperationException("Precondition failed: no alternative in-stock barcode found for the main item's article.");

            var oldSerialNumber = this.Sql<string>($"SELECT SerialNumber FROM MasterDataList WHERE I3D = {masterDataListI3D}");
            var newSerialNumber = this.Sql<string>($"SELECT Barcode FROM Barcode WHERE I3D = {newSerialNumberI3D}");
            var historyCutoffI3D = this.GetCurrentMaxHistoryI3D();

            using var bl = new BLSession();
            var loggedInUser = this.GetLoggedInUser();

            var result = bl.GetBL<MasterDataListWebServiceBL>().SwapMainDeviceSerialNumber(masterDataListI3D, newSerialNumberI3D, loggedInUser);

            this.Verifier.Verify("SwapMainDeviceSerialNumber_WithCounters_UpdatesAll_Result", new
            {
                result.Status,
                result.Message
            });
            this.Verifier.VerifySql(
                "SwapMainDeviceSerialNumber_WithCounters_UpdatesAll_DbHead",
                $"SELECT I3D, SeriennummerI3D, Seriennummer FROM GeraeteKopf WHERE I3D = {masterDataListI3D}");
            this.Verifier.VerifySql(
                "SwapMainDeviceSerialNumber_WithCounters_UpdatesAll_DbCounters",
                $"SELECT I3D, GeraeteKopfI3D, SeriennummerI3D FROM GeraeteClickZaehler WHERE GeraeteKopfI3D = {masterDataListI3D} ORDER BY I3D");
            this.Verifier.VerifySql(
                "SwapMainDeviceSerialNumber_WithCounters_UpdatesAll_History",
                BuildSerialNumberHistoryQuery(
                    masterDataListI3D,
                    historyCutoffI3D,
                    loggedInUser.User.Employee.I3D,
                    $"Seriennummer vom Hauptgerät wurde getauscht von \"{oldSerialNumber}\" auf \"{newSerialNumber}\""));
        }

        /// <summary>
        /// Highest AnlageLog I3D before the operation under test runs, used as a cutoff so the history
        /// assertion only sees rows this test actually produced and not leftovers from earlier runs.
        /// </summary>
        private int GetCurrentMaxHistoryI3D()
        {
            return this.Sql<int>("SELECT ISNULL(MAX(I3D), 0) FROM AnlageLog");
        }

        /// <summary>
        /// Reads the Stammblatt history entries (AnlageLog) that the operation under test wrote.
        /// The cutoff limits the result to rows this run produced, so leftovers from earlier runs cannot
        /// satisfy the check, and an unexpected additional entry shows up as an extra row in the snapshot.
        /// MatchesExpected covers the exact description including old and new serial number.
        /// Employee and date are compared as flags because their raw values differ per run.
        /// </summary>
        private static string BuildSerialNumberHistoryQuery(int masterDataListI3D, int historyCutoffI3D, int expectedEmployeeI3D, string expectedDescription)
        {
            var expectedLiteral = expectedDescription.Replace("'", "''");

            return $@"
                SELECT Beschreibung,
                       CASE WHEN Beschreibung = N'{expectedLiteral}' THEN 1 ELSE 0 END AS MatchesExpected,
                       CASE WHEN PersonalI3D = {expectedEmployeeI3D} THEN 1 ELSE 0 END AS IsExpectedEmployee,
                       CASE WHEN Datum IS NOT NULL THEN 1 ELSE 0 END AS HasDate
                FROM AnlageLog
                WHERE AnlageI3D = {masterDataListI3D}
                  AND I3D > {historyCutoffI3D}
                ORDER BY I3D";
        }
    }
}