using Centron.DAO;
using Centron.Data.WebServices.Sales.Receipts;
using Centron.Tests.EndToEnd.Infrastructure.Verifier;
using DevExpress.CodeParser;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Windows.Forms;
using Xunit;
using Centron.Core;
using Centron.Core.Utils;
using DevExpress.Spreadsheet;

namespace Centron.Tests.EndToEnd.Infrastructure.Verifier
{
    public class CentronVerifier
    {
        public CentronVerifier()
        {
            this.Settings = new CentronVerifierSettings();

            this.Settings.IgnoreProperty<ReceiptBaseDTO>(f => f.CreatedThroughApplicationVersion);
            this.Settings.IgnoreProperty<ReceiptBaseDTO>(f => f.ChangedThroughApplicationVersion);
        }

        public CentronVerifierSettings Settings { get; }
        public bool OverrideExpectedFiles { get; set; }

        public void VerifyTable(string name, string tableName, string where = null, CentronVerifierSettings settings = null, [CallerFilePath] string sourceFile = "")
        {
            where = where ?? "1 = 1";
            string sqlStatement = $"SELECT * FROM {tableName} WHERE {where}";

            this.VerifySql(name, sqlStatement, settings, sourceFile);
        }

        public void VerifySql(string name, string sqlStatement, CentronVerifierSettings settings = null, [CallerFilePath] string sourceFile = "")
        {
            using (var session = new DAOSession())
            {
                var table = session.Advanced.RawSqlAccess.GetRawSqlResult(sqlStatement);

                this.Verify(name, table, settings, sourceFile: sourceFile);
            }
        }

        public void VerifyExcel(string fileName, byte[] excel, [CallerFilePath] string sourceFile = "")
        {
            var workbook = new Workbook();
            workbook.LoadDocument(excel);
            var worksheet = workbook.Worksheets[0];

            string[,] excelCellValues = new string[worksheet.Rows.LastUsedIndex + 1, worksheet.Columns.LastUsedIndex + 1];

            for (int i = 0; i <= worksheet.Rows.LastUsedIndex; i++)
                for (int j = 0; j <= worksheet.Columns.LastUsedIndex; j++)
                {
                    var testCell = worksheet.Cells[i, j].Value.ToString();

                    excelCellValues[i, j] = testCell;
                }

            this.Verify(fileName, excelCellValues, sourceFile: sourceFile);
        }

        public void Verify(string name, object data, CentronVerifierSettings settings = null, [CallerFilePath] string sourceFile = "")
        {
            Guard.NotNullOrWhiteSpace(name, nameof(name));
            //data can be NULL
            //differentPerTargetFramework can be anything
            //settings can be NULL
            Guard.NotNullOrWhiteSpace(sourceFile, nameof(sourceFile));

            if (settings != null)
            {
                settings.MergeWith(this.Settings);
            }
            else
            {
                settings = this.Settings;
            }

            var json = this.SerializeAsJson(data, settings);

            var expectedFileName = this.GetExpectedFileName(name, sourceFile);
            var actualFileName = this.GetActualFileName(name, sourceFile);
            var directory = Path.GetDirectoryName(expectedFileName);

            if (Directory.Exists(directory) == false)
                Directory.CreateDirectory(directory);

            if (this.OverrideExpectedFiles)
            {
                File.WriteAllText(expectedFileName, json, Encoding.UTF8);
                return;
            }

            File.WriteAllText(actualFileName, json, Encoding.UTF8);

            var expected = File.Exists(expectedFileName)
                ? File.ReadAllText(expectedFileName, Encoding.UTF8)
                : string.Empty;

            expected = expected.Replace(@"\r", @"");
            json = json.Replace(@"\r", @"");

            try
            {
                Assert.Equal(expected, json, ignoreLineEndingDifferences:true);
            }
            catch (Exception e)
            {
                if(Debugger.IsAttached)
                    this.StartDiffTool(expectedFileName, actualFileName);

                Console.WriteLine(json);
                throw new Exception(name + " failed", e);
            }
        }

        private string SerializeAsJson(object data, CentronVerifierSettings verifierSettings)
        {
            var settings = new JsonSerializerSettings
            {
                Formatting = Newtonsoft.Json.Formatting.Indented,
                Converters = new List<JsonConverter>
                    {
                        verifierSettings.CleanupGuidValues ? new CleanupValuesConverter<Guid>() : null,
                        verifierSettings.CleanupDateTimeValues ? new CleanupValuesConverter<DateTime>(new DateTimeEqualityComparer()) : null,
                        verifierSettings.CleanupDateTimeOffsetValues ? new CleanupValuesConverter<DateTimeOffset>(new DateTimeOffsetEqualityComparer()) : null,
                    }
                    .Where(f => f != null)
                    .ToList(),
                ContractResolver = verifierSettings.GetContractResolver(),
            };

            var ignoredColumns = verifierSettings.GetIgnoredColumns();
            if (ignoredColumns.Any() && data is DataTable table)
            {
                foreach (var ignoredColumn in ignoredColumns)
                {
                    if (table.Columns.Contains(ignoredColumn))
                        table.Columns.Remove(ignoredColumn);
                }
            }

            var serializer = JsonSerializer.Create(settings);
            var builder = new StringBuilder();

            using (var stringWriter = new StringWriter(builder))
            using (var writer = new JsonTextWriter(stringWriter) { QuoteChar = '\'', QuoteName = false })
            {
                serializer.Serialize(writer, data);
            }

            builder.Replace(@"\\", @"\");

            return builder.ToString();
        }

        private string GetExpectedFileName(string name, string sourceFile)
        {
            return $"{Path.GetDirectoryName(sourceFile)}/{name}.expected.txt";
        }

        private string GetActualFileName(string name, string sourceFile)
        {
            return $"{Path.GetDirectoryName(sourceFile)}/{name}.actual.txt";
        }

        private void StartDiffTool(string expectedFileName, string actualFileName)
        {
            try
            {
                if (File.Exists(expectedFileName) == false || File.Exists(actualFileName) == false)
                    return;

                string vsPath = @"C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\Common7\IDE\devenv.exe";

                if (File.Exists(vsPath))
                    ProcessHelper.Start(vsPath, $"/diff \"{actualFileName}\" \"{expectedFileName}\"");
                else
                    ProcessHelper.Start("code", $"--diff \"{actualFileName}\" \"{expectedFileName}\"");
            }
            catch (Exception)
            {
                //Ooops
            }
        }
    }
}