using ClosedXML.Excel;
using System;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics.CodeAnalysis;
using System.IO;
using System.IO.Packaging;
using System.Linq;
using System.Text.RegularExpressions;

namespace Strata.ContinuousImprovement.Biz.Test.Unit.Utilities
{
    [ExcludeFromCodeCoverage]
    internal static class ExcelDocsComparer
    {
        public static bool Compare(string left, string right, out string message)
        {
            using (FileStream leftStream = File.OpenRead(left))
            using (FileStream rightStream = File.OpenRead(right))
            {
                return Compare(leftStream, rightStream, out message);
            }
        }

        public static bool Compare(this Stream result, Stream expected, out string message)
        {
            using (Package leftPackage = Package.Open(result, FileMode.Open, FileAccess.Read))
            using (Package rightPackage = Package.Open(expected, FileMode.Open, FileAccess.Read))
            {
                return PackageHelper.Compare(leftPackage, rightPackage, false, ExcludeMethod, out message);
            }
        }

        public static bool Compare(this IXLWorkbook result, IXLWorkbook expected, out string message)
        {
            using (var resultStream = new MemoryStream())
            using (var wbStream = new MemoryStream())
            {
                expected.SaveAs(wbStream);
                result.SaveAs(resultStream);
                return wbStream.Compare(resultStream, out message);
            }
        }

        private static bool ExcludeMethod(Uri uri)
        {
            //Exclude service data
            if (uri.OriginalString.EndsWith(".rels") ||
                uri.OriginalString.EndsWith(".psmdcp"))
            {
                return true;
            }
            return false;
        }

        public static Dictionary<string, DataTable> GetDataTables(this IXLWorkbook workbook)
        {
            var dataTables = new Dictionary<string, DataTable>();
            foreach (var ws in workbook.Worksheets)
            {
                var name = ws.Name;
                DataTable dt = new DataTable();
                foreach (var cell in ws.RowsUsed().First().CellsUsed())
                {
                    var columnName = "_" + cell.Value.ToString().ToAlphaNumericOnly();
                    dt.Columns.Add(columnName);
                }
                foreach (var row in ws.RowsUsed().Where(x => x.RowNumber() > 1))
                {
                    DataRow temprow = dt.NewRow();

                    for (int i = 0; i < dt.Columns.Count; i++)
                    {
                        try
                        {
                            var cellValue = row.Cells().ElementAt(i).Value.ToString();
                            temprow[i] = cellValue.TrimWhiteSpaces().RemoveLineBreaks();
                        }
                        catch (Exception)
                        {
                            // Empty Cell
                        }
                    }

                    dt.Rows.Add(temprow);
                }
                dataTables.Add(name, dt);
            }
            return dataTables;
        }
        private static string ToAlphaNumericOnly(this string input)
        {
            Regex rgx = new Regex("[^a-zA-Z0-9]");
            return rgx.Replace(input, "");
        }

        public static string TrimWhiteSpaces(this string text)
        {
            text = text.TrimStart(' ');
            text = text.TrimEnd(' ');
            text = text.Trim();

            return text;
        }

        public static string RemoveLineBreaks(this string text)
        {
            string replaceWith = "";
            string removedBreaks = text.Replace("\r\n", replaceWith).Replace("\n", replaceWith).Replace("\r", replaceWith);

            return text;
        }

    }
}