#region Usings
using System;
using System.Collections.Generic;
using System.IO;
#endregion

#region Text Line Remover and Friends
// modified from https://stackoverflow.com/questions/668907/how-to-delete-a-line-from-a-text-file-in-c/668914#668914

public static class TextLineRemover
{
    public static void RemoveTextLines(IList<string> linesToRemove, string filename, string tempFilename)
    {
        // Initial values
        int lineNumber = 0;
        int linesRemoved = 0;
        DateTime startTime = DateTime.Now;

        // Read file
        using (var sr = new StreamReader(filename))
        {
            // Write new file
            using (var sw = new StreamWriter(tempFilename))
            {
                // Read lines
                string line;
                while ((line = sr.ReadLine()) != null)
                {
                    lineNumber++;
                    // Look for text to remove
                    if (!ContainsString(line, linesToRemove))
                    {
                        // Keep lines that does not match
                        sw.WriteLine(line);
                    }
                    else
                    {
                        // Ignore lines that DO match
                        linesRemoved++;
                        InvokeOnRemovedLine(new RemovedLineArgs
                        {
                            RemovedLine = line,
                            RemovedLineNumber = lineNumber
                        });
                    }
                }
            }
        }

        //FixedFileMove deletes the original file and moves the temp file in.
        GlobalFuncs.FixedFileMove(tempFilename, filename, true);

        // Final calculations
        DateTime endTime = DateTime.Now;
        InvokeOnFinished(new FinishedArgs
        {
            LinesRemoved = linesRemoved,
            TotalLines = lineNumber,
            TotalTime = endTime.Subtract(startTime)
        });
    }

    private static bool ContainsString(string line, IEnumerable<string> linesToRemove)
    {
        foreach (var lineToRemove in linesToRemove)
        {
            if (line.Contains(lineToRemove))
                return true;
        }
        return false;
    }

    public static event RemovedLine OnRemovedLine;
    public static event Finished OnFinished;

    public static void InvokeOnFinished(FinishedArgs args)
    {
        OnFinished?.Invoke(null, args);
    }

    public static void InvokeOnRemovedLine(RemovedLineArgs args)
    {
        OnRemovedLine?.Invoke(null, args);
    }
}

public delegate void Finished(object sender, FinishedArgs args);

public struct FinishedArgs
{
    public int TotalLines { get; set; }
    public int LinesRemoved { get; set; }
    public TimeSpan TotalTime { get; set; }
}

public delegate void RemovedLine(object sender, RemovedLineArgs args);

public struct RemovedLineArgs
{
    public string RemovedLine { get; set; }
    public int RemovedLineNumber { get; set; }
}
#endregion