using InnovEnergy.SysTools.Edges;
using InnovEnergy.SysTools.Utils;

namespace InnovEnergy.SysTools.Remote;

public static class RemoteFileIo
{

    public static Boolean Exists(this RemotePath remotePath)
    {
        var (host, path) = remotePath;

        return "test"
            .Opt("e")
            .Arg(path)
            .At(host)
            .ExecuteBlocking()
            .ExitCode == 0;
    }

    // TODO: how to find out if ssh has failed or remote command?

    public static Boolean DirectoryExists(this RemotePath remotePath)
    {
        var (host, path) = remotePath;

        return "test"
            .Opt("d")
            .Arg(path)
            .At(host)
            .ExecuteBlocking()
            .ExitCode == 0;
    }

    public static Boolean FileExists(this RemotePath remotePath)
    {
        var (host, path) = remotePath;

        return "test"
            .Opt("f")
            .Arg(path)
            .At(host)
            .ExecuteBlocking()
            .ExitCode == 0;
    }

    public static Boolean DirectoryExists(this RemotePath remotePath, String directoryName)
    {
        return DirectoryExists(remotePath / directoryName);
    }

    public static Boolean FileExists(this RemotePath remotePath, String fileName)
    {
        return DirectoryExists(remotePath / fileName);
    }

    public static IEnumerable<RemotePath> Directories(this RemotePath rp)
    {
        var (host, path) = rp;

        return "find"
            .Arg(path)
            .Opt1("mindepth", 1)
            .Opt1("maxdepth", 1)
            .Opt1("type", "d")
            .At(host)
            .ExecuteBlocking()
            .ThrowOnError()
            .StdOut
            .Select(p => new RemotePath(host, p));
    }

    public static IEnumerable<RemotePath> Files(this RemotePath rp)
    {
        var (host, path) = rp;

        return "find"
            .Arg(path)
            .Opt1("mindepth", 1)
            .Opt1("maxdepth", 1)
            .Opt1("type", "f")
            .At(host)
            .ExecuteBlocking()
            .ThrowOnError()
            .StdOut
            .Select(p => new RemotePath(host, p));
    }

    public static RemotePath CreateDirectory(this RemotePath remotePath)
    {
        var (host, path) = remotePath;

        "mkdir".Arg(path)
            .At(host)
            .ExecuteBlocking()
            .ThrowOnError();

        return remotePath;
    }

    public static RemotePath MoveFileTo(this RemotePath sourcePath, RemotePath targetPath)
    {
        throw new NotImplementedException();
    }

    public static RemotePath MoveDirectory(this RemotePath sourcePath, RemotePath targetPath)
    {
        throw new NotImplementedException();
    }

    public static RemotePath CreateDirectory(this RemotePath path, String dirName)
    {
        return CreateDirectory(path / dirName);
    }

    public static RemotePath DeleteFile(this RemotePath remotePath)
    {
        var (host, path) = remotePath;  // TODO: test file

        "rm".Arg(path)
            .At(host)
            .ExecuteBlocking()
            .ThrowOnError();

        return remotePath;
    }


    public static RemotePath DeleteFile(this RemotePath path, String fileName)
    {
        return DeleteFile(path / fileName);
    }

    public static RemotePath DeleteDirectory(this RemotePath remotePath)
    {
        var (host, path) = remotePath;  // TODO: test dir

        "rm".Opt("r")
            .Arg(path)
            .At(host)
            .ExecuteBlocking()
            .ThrowOnError();

        return remotePath;
    }

    public static RemotePath DeleteDirectory(this RemotePath path, String directoryName)
    {
        return DeleteDirectory(path / directoryName);
    }

    public static RemotePath CopyDirectoryTo(this RemotePath sourceDir, RemotePath targetDir)
    {
        throw new NotImplementedException();
    }


    public static RemotePath CopyFileTo(this RemotePath srcFile, RemotePath targetFile)
    {
        throw new NotImplementedException();
    }

    public static RemotePath CopyFileToDirectory(this RemotePath srcFile, RemotePath targetDir)
    {
        throw new NotImplementedException();
    }

    public static IEnumerable<RemotePath> DescendantDirectories(this RemotePath remotePath)
    {
        var (host, path) = remotePath;

        return "find"
            .Arg(path)
            .Opt1("type", "d")
            .At(host)
            .ExecuteBlocking()
            .ThrowOnError()
            .StdOut
            .Select(d => new RemotePath(host, d));
    }

    public static IEnumerable<RemotePath> DescendantFiles(this RemotePath remotePath)
    {
        var (host, path) = remotePath;

        return "find"
            .Arg(path)
            .Opt1("type", "f")
            .At(host)
            .ExecuteBlocking()
            .ThrowOnError()
            .StdOut
            .Select(d => new RemotePath(host, d));
    }

    public static IEnumerable<RemotePath> Descendants(this RemotePath remotePath)
    {
        var (host, path) = remotePath;
        return "find"
            .Arg(path)
            .Opt1("mindepth", 1)
            .At(host)
            .ExecuteBlocking()
            .ThrowOnError()
            .StdOut
            .Select(l => new RemotePath(host, l));
    }


    public static IEnumerable<Byte> ReadBytes(this RemotePath path)
    {
        throw new NotImplementedException();
    }


    public static IReadOnlyList<String> ReadLines(this RemotePath remotePath)
    {
        var (host, path) = remotePath;

        return "cat"
            .Arg(path)
            .At(host)
            .ExecuteBlocking()
            .ThrowOnError()
            .StdOut;
    }

    // public static IEnumerable<String> ReadLines(this RemotePath path, Encoding encoding)
    // {
    //     throw new NotImplementedException();
    // }

    //public static String ReadText(this RemotePath path) => path.ReadText(Encoding.UTF8);

    public static String ReadText(this RemotePath rp)
    {
        var lines = ReadLines(rp);

        if (lines.Count == 0) return "";
        if (lines.Count == 1) return lines[0];

        return lines.Aggregate((a, b) => a.NewLine() + b);
    }

    public static RemotePath WriteText(this RemotePath rp, String text)
    {
        throw new NotImplementedException();
    }


    public static RemotePath AppendLines(this RemotePath filePath, params String[] lines)
    {
        return AppendLines(filePath, (IEnumerable<String>) lines);
    }

    public static RemotePath AppendLines(this RemotePath rp, IEnumerable<String> lines)
    {
        return WriteLines(rp, lines, append: true);
    }

    public static RemotePath WriteLines(this RemotePath filePath, params String[] lines)
    {
        return WriteLines(filePath, (IEnumerable<String>) lines);
    }

    public static RemotePath WriteLines(this RemotePath rp, IEnumerable<String> lines)
    {
        return WriteLines(rp, lines, append: false);
    }

    private static RemotePath WriteLines(this RemotePath rp, IEnumerable<String> lines, Boolean append)
    {
        var (host, path) = rp;

        var proc = "cat"
            .Arg(append ? ">>" : ">")
            .Arg(path)
            .At(host).ToAsyncProcess();

        foreach (var line in lines)
            proc.StandardIn.OnNext(line);

        proc.StandardIn.OnCompleted();  // TODO: OnCompleted or not?

        // TODO: error handling

        var exitCode = proc.WaitForExit();

        return rp;
    }

    public static RemotePath AppendText(this RemotePath filePath, String text)
    {
        throw new NotImplementedException();
    }


}