using Microsoft.Extensions.Logging;
using System.Text;

namespace File_Folder_Helper.Helpers;

internal static class HelperSaveOrCopyContents
{

    private record TicksDirectory(string Directory,
                                  string DirectoryName,
                                  long DirectoryTicks,
                                  float? TotalDays);

    private static List<TicksDirectory> UpdateDateVerifyAndGetTicksDirectories(string directory)
    {
        List<TicksDirectory> results = new();
        float? totalDays;
        string ticksDirectoryName;
        DirectoryInfo directoryInfo;
        long? lastDirectoryTicks = null;
        DateTime dateTime = DateTime.Now;
        string[] ticksDirectories = Directory.GetDirectories(directory, "*", SearchOption.TopDirectoryOnly);
        foreach (string ticksDirectory in ticksDirectories)
        {
            ticksDirectoryName = Path.GetFileName(ticksDirectory);
            if (ticksDirectoryName.Length < 3 || ticksDirectoryName.First() != '(' || ticksDirectoryName[^1] != ')')
                continue;
            if (!long.TryParse(ticksDirectoryName[1..^1], out long directoryTicks))
            {
                if (!long.TryParse(ticksDirectoryName[1..^4], out directoryTicks))
                    throw new NotSupportedException();
            }
            directoryInfo = new(ticksDirectory);
            if (directoryInfo.CreationTime.Ticks != directoryTicks)
                Directory.SetCreationTime(ticksDirectory, new DateTime(directoryTicks));
            if (directoryInfo.LastWriteTime.Ticks != directoryTicks)
                Directory.SetLastWriteTime(ticksDirectory, new DateTime(directoryTicks));
            totalDays = lastDirectoryTicks is null || new TimeSpan(dateTime.Ticks - directoryTicks).TotalDays < 1 ? null : (float)new TimeSpan(directoryTicks - lastDirectoryTicks.Value).TotalDays;
            results.Add(new(ticksDirectory, ticksDirectoryName, directoryTicks, totalDays));
            lastDirectoryTicks = directoryTicks;
        }
        string[] compare = (from l in results where l.TotalDays is not null and < 3.95f select l.Directory).ToArray();
        if (compare.Any())
            throw new Exception($"Please Consolidate <{string.Join(Environment.NewLine, compare)}>");
        return results;
    }

    internal static void SaveOrCopyContents(ILogger log, string argsZero, ConsoleKey consoleKey)
    {
        SearchOption searchOption;
        bool fileNameWithoutExtension;
        bool alongSideTopDirectoryOnly = false;
        bool alongSideAllDirectories = false;
        bool clipboardTopDirectoryOnly = false;
        switch (consoleKey)
        {
            case ConsoleKey.A:
                alongSideTopDirectoryOnly = true;
                searchOption = SearchOption.TopDirectoryOnly;
                fileNameWithoutExtension = false;
                break;
            case ConsoleKey.B:
                alongSideAllDirectories = true;
                searchOption = SearchOption.AllDirectories;
                fileNameWithoutExtension = false;
                break;
            case ConsoleKey.C:
                clipboardTopDirectoryOnly = true;
                searchOption = SearchOption.TopDirectoryOnly;
                fileNameWithoutExtension = false;
                break;
            case ConsoleKey.D:
                clipboardTopDirectoryOnly = true;
                searchOption = SearchOption.AllDirectories;
                fileNameWithoutExtension = false;
                break;
            case ConsoleKey.E:
                clipboardTopDirectoryOnly = true;
                searchOption = SearchOption.TopDirectoryOnly;
                fileNameWithoutExtension = true;
                break;
            case ConsoleKey.F:
                clipboardTopDirectoryOnly = true;
                searchOption = SearchOption.AllDirectories;
                fileNameWithoutExtension = true;
                break;
            default:
                throw new Exception();
        }
        log.LogInformation("D) Directory, F) File or B) Both?");
        ConsoleKey dfb = Console.ReadKey().Key;
        log.LogInformation("{empty}", string.Empty);
        if (dfb is not ConsoleKey.D and not ConsoleKey.F and not ConsoleKey.B)
            throw new Exception("Not valid");
        else
        {
            string fileName = dfb switch
            {
                ConsoleKey.D => "Directories",
                ConsoleKey.F => "Files",
                ConsoleKey.B => "Both",
                _ => throw new Exception(),
            };
            long now = DateTime.Now.Ticks;
            StringBuilder data = new();
            string[] dataCollection;
            string? parentDirectory = Path.GetDirectoryName(argsZero);
            if (string.IsNullOrEmpty(parentDirectory))
                throw new Exception();
            string filePathAndName = Path.Combine(parentDirectory, $"{fileName}.txt");
            if (alongSideTopDirectoryOnly)
                File.WriteAllText(filePathAndName, string.Empty);
            else if (alongSideAllDirectories)
                File.WriteAllText(filePathAndName, string.Concat(argsZero, Environment.NewLine, "Start", Environment.NewLine));
            switch (dfb)
            {
                case ConsoleKey.D:
                    if (alongSideTopDirectoryOnly || clipboardTopDirectoryOnly)
                    {
                        dataCollection = Directory.GetDirectories(argsZero, "*", searchOption);
                        if (!(dataCollection == null) && dataCollection.Length > 0)
                        {
                            foreach (string s in dataCollection)
                            {
                                if (fileNameWithoutExtension)
                                    _ = data.Append('\'').Append(Path.GetFileNameWithoutExtension(s)).Append("', ");
                                else
                                    _ = data.AppendLine(s);
                            }
                        }
                        if (clipboardTopDirectoryOnly && consoleKey == ConsoleKey.C)
                            _ = UpdateDateVerifyAndGetTicksDirectories(argsZero);
                    }
                    else if (alongSideAllDirectories)
                    {
                        dataCollection = Directory.GetDirectories(argsZero, "*", searchOption);
                        if (!(dataCollection == null) && dataCollection.Length > 0)
                        {
                            foreach (string s in dataCollection)
                                File.AppendAllText(filePathAndName, string.Concat(s.Replace(argsZero, "../"), Environment.NewLine));
                        }
                    }
                    else
                        throw new Exception();
                    break;
                case ConsoleKey.F:
                    if (alongSideTopDirectoryOnly || clipboardTopDirectoryOnly)
                    {
                        dataCollection = Directory.GetFiles(argsZero, "*", searchOption);
                        if (!(dataCollection == null) && dataCollection.Length > 0)
                        {
                            foreach (string s in dataCollection)
                            {
                                if (fileNameWithoutExtension)
                                    _ = data.Append('\'').Append(Path.GetFileNameWithoutExtension(s)).Append("', ");
                                else
                                    _ = data.AppendLine(s);
                            }
                        }
                    }
                    else if (alongSideAllDirectories)
                    {
                        dataCollection = Directory.GetFiles(argsZero, "*", searchOption);
                        if (!(dataCollection == null) && dataCollection.Length > 0)
                        {
                            foreach (string s in dataCollection)
                                File.AppendAllText(filePathAndName, string.Concat(s.Replace(argsZero, "../"), Environment.NewLine));
                        }
                    }
                    else
                        throw new Exception();
                    break;
                case ConsoleKey.B:
                    if (alongSideTopDirectoryOnly || clipboardTopDirectoryOnly)
                    {
                        dataCollection = Directory.GetFiles(argsZero, "*", searchOption);
                        if (!(dataCollection == null) && dataCollection.Length > 0)
                        {
                            foreach (string s in dataCollection)
                            {
                                if (fileNameWithoutExtension)
                                    _ = data.Append('\'').Append(Path.GetFileNameWithoutExtension(s)).Append("', ");
                                else
                                    _ = data.AppendLine(s);
                            }
                        }
                    }
                    else if (alongSideAllDirectories)
                    {
                        dataCollection = Directory.GetDirectories(argsZero, "*", searchOption);
                        if (!(dataCollection == null) && dataCollection.Length > 0)
                        {
                            foreach (string s in dataCollection)
                                File.AppendAllText(filePathAndName, string.Concat(s.Replace(argsZero, "../"), Environment.NewLine));
                        }
                    }
                    else
                        throw new Exception();
                    break;
                default:
                    throw new Exception();
            }
            TimeSpan timeSpan = new(DateTime.Now.Ticks - now);
            log.LogInformation("{TotalSeconds} TotalSeconds", timeSpan.TotalSeconds);
            if (alongSideTopDirectoryOnly)
            {
                File.WriteAllText(filePathAndName, data.ToString());
                log.LogInformation("Data written");
            }
            else if (clipboardTopDirectoryOnly)
            {
                TextCopy.ClipboardService.SetText(data.ToString());
                log.LogInformation("Data stored in clipboard");
            }
            else if (alongSideAllDirectories)
            {
                File.AppendAllText(filePathAndName, "Done");
                log.LogInformation("Data written");
            }
            else
                throw new Exception();
            log.LogInformation("Press any key to close");
        }
    }

    internal static void IgnoreCaseAndRenameFilesToLowercase(ILogger log, string argsZero)
    {
        string fileName;
        int filesRenamed = 0;
        string[] files = Directory.GetFiles(argsZero, "*", SearchOption.TopDirectoryOnly);
        foreach (string file in files)
        {
            fileName = Path.GetFileName(file);
            if (fileName == fileName.ToLower())
                continue;
            File.Move(file, file.ToLower());
            filesRenamed++;
        }
        log.LogInformation("{filesRenamed}(s) renamed", filesRenamed);
    }

}