using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Configuration;

namespace ChangeCopyrightInfo
{
    class Program
    {
        static string Path
        {
            get { return ConfigurationManager.AppSettings["path"]; }
        }

        static string Files
        {
            get { return ConfigurationManager.AppSettings["files"]; }
        }

        static List<string> copyrigth = null;
        static List<string> Copyrigth
        {
            get {
                if (copyrigth != null) return copyrigth;
                copyrigth = new List<string>();
                string text = ConfigurationManager.AppSettings["copyrigth"];
                if (text == null) return copyrigth;
                copyrigth.AddRange( text.Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries) );
                return copyrigth;
            }
        }
        static string startcopyrigth
        {
            get { return ConfigurationManager.AppSettings["startcopyrigth"]; }
        }

        static void Main(string[] args)
        {
            Log.Initialize(ConfigurationManager.AppSettings["LogFile"]);
            Log.WriteApplicationStart();

            if (Path != null)
                CheckDirectory(Path);

            Log.WriteApplicationEnd();
        }

        static void CheckDirectory(string directory)
        {
            Log.WriteLine("Check " + directory);

            string[] dirFiles = Directory.GetFiles(directory, Files);

            foreach (string file in dirFiles)
                CheckFile(file);

            string[] dirDirs = Directory.GetDirectories(directory);

            foreach(string dir in dirDirs)
                CheckDirectory(dir);
        }

        static void CheckFile(string file)
        {
            List<string> lines = new List<string>();
            lines.AddRange(File.ReadAllLines(file));

            bool copyrigthExist = false;
            if (Copyrigth.Count <= lines.Count)
            {
                for (int i = 0; i < Copyrigth.Count; i++)
                    if (Copyrigth[i].Trim().ToLower() != lines[i].Trim().ToLower())
                        break;

                copyrigthExist = true;
            }

            if (copyrigthExist)
                return;

            Log.WriteLine("Change copyrigth : " + file);

            // skip copyrigth
            int skip = 0;
            if (lines.Count>0)
            {
                if (lines[0].StartsWith(startcopyrigth, StringComparison.CurrentCultureIgnoreCase))
                {
                    for (int i = 1; i < lines.Count; i++)
                    {
                        if (!lines[i].StartsWith("//"))
                            break;
                        skip = i;
                    }
                }
            }

            // skip WhiteSpace
            for (int i = skip+1; i < lines.Count; i++)
            {
                if (!string.IsNullOrWhiteSpace(lines[i]))
                    break;
                skip = i;
            }

            lines.RemoveRange(0, skip);

            File.WriteAllLines(file, Copyrigth);
            File.AppendAllText(file, Environment.NewLine);
            File.AppendAllLines(file, lines);
        }
    }
}