using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Runtime.InteropServices;
using System.Security.Cryptography.X509Certificates;
using System.Text.Json.Serialization;
using System.Threading.Tasks;
using Newtonsoft.Json;

namespace CrossLangDevStudio;


class CrossLangShell
{
    private static CrossLangSettings? settings = null;
    public static CrossLangSettings Settings
    {
        get
        {
            if (settings != null) return settings;
            var config = CrossLangConfigDirectory;
            if (!string.IsNullOrWhiteSpace(config))
            {
                var devStudioDir = Path.Combine(config, "DevStudio");
                Directory.CreateDirectory(devStudioDir);
                var settingsFile = Path.Combine(devStudioDir, "Settings.json");
                if (File.Exists(settingsFile))
                {
                    settings = JsonConvert.DeserializeObject<CrossLangSettings>(File.ReadAllText(settingsFile));
                }
            }
                
            return settings is null ? settings = new CrossLangSettings() : settings;
        }
    }
    private static string _crosslang_config_dir = "";

    public static string CrossLangConfigDirectory => string.IsNullOrWhiteSpace(_crosslang_config_dir) ? _crosslang_config_dir = GetCrossLangDirectory() : _crosslang_config_dir;

    public static List<string> GetRecentProjects()
    {
        var config = CrossLangConfigDirectory;
        if (string.IsNullOrWhiteSpace(config)) return new List<string>();

        var devStudioDir = Path.Combine(config, "DevStudio");
        Directory.CreateDirectory(devStudioDir);
        var configPath = Path.Combine(devStudioDir, "Recents.json");
        if (File.Exists(configPath))
        {
            var list = JsonConvert.DeserializeObject<List<string>>(File.ReadAllText(configPath));
            if (list is not null) return list;
        }

        return new List<string>();
    }
    public static void OpenFolderInFileManager(string path)
    {
        using (Process p = new Process())
        {
            p.StartInfo.FileName = path;
            p.StartInfo.UseShellExecute = true;
            p.Start();
        }
    }
    public static void EnsureRecent(string projectPath)
    {
        projectPath = Path.GetFullPath(projectPath).TrimEnd(Path.DirectorySeparatorChar);
        var recents = GetRecentProjects();
        if (recents.Contains(projectPath))
        {
            recents.Remove(projectPath);
        }
        recents.Insert(0, projectPath);
        if (recents.Count > 5)
        {
            recents.RemoveRange(5, recents.Count - 5);
        }

        var config = CrossLangConfigDirectory;
        if (string.IsNullOrWhiteSpace(config)) return;

        var devStudioDir = Path.Combine(config, "DevStudio");
        Directory.CreateDirectory(devStudioDir);
        var configPath = Path.Combine(devStudioDir, "Recents.json");
        File.WriteAllText(configPath, JsonConvert.SerializeObject(recents, Formatting.Indented));
    }
    public static string GetRealPath(string exec)
    {
        foreach (var item in (Environment.GetEnvironmentVariable("PATH") ?? "").Split(Path.PathSeparator))
            {
                var path = Path.Combine(item, exec);
                if (File.Exists(path)) return path;
                foreach (var ext in (Environment.GetEnvironmentVariable("PATHEXT") ?? "").Split(Path.PathSeparator))
                {
                    if (File.Exists(path + ext)) return path + ext;
                }
            }
        return "";
    }

    public static string CrossLangPath
    {
        get
        {
            var path = GetRealPath("crosslang");
            return path;
        }
    }
    public static bool HaveCrossLang
    {
        get
        {
            return !string.IsNullOrWhiteSpace(CrossLangPath);
        }
    }
    public static void BuildProjectInFolder(string folder)
    {
        OpenTerminal(false, folder, CrossLangPath, "build");
    }
    public static void RunProjectInFolder(string folder)
    {
        OpenTerminal(true, folder, CrossLangPath, "run");
    }
    public static void OpenTerminalInFolder(string folder)
    {
        if (OperatingSystem.IsLinux())
        {
            OpenTerminal(false, folder, "", []);
        }
    }

    public static void OpenTerminal(bool keepOpen, string workingDirectory, string commandName, params string[] args)
    {
        var preferedTerminalCommand = Settings.PreferedTerminalCommand;
        if (!string.IsNullOrWhiteSpace(preferedTerminalCommand))
        {
            var firstArgs = preferedTerminalCommand.Split(" ");
            using Process process = new();
            process.StartInfo.UseShellExecute = false;
            process.StartInfo.WorkingDirectory = workingDirectory;
            process.StartInfo.FileName = firstArgs[0];
            for (int i = 1; i < firstArgs.Length; i++)
            {
                process.StartInfo.ArgumentList.Add(firstArgs[i]);
            }
            foreach (var arg in args)
                process.StartInfo.ArgumentList.Add(arg);
            process.Start();
            return;
        }
        if (OperatingSystem.IsLinux() || OperatingSystem.IsFreeBSD())
        {
            string konsole = GetRealPath("konsole");
            string gnome_terminal = GetRealPath("gnome-terminal");

            string xterm = GetRealPath("xterm");
            if (File.Exists(konsole))
            {
                using Process process = new Process();
                process.StartInfo.WorkingDirectory = workingDirectory;
                process.StartInfo.FileName = konsole;
                process.StartInfo.UseShellExecute = false;
                if (commandName.Length != 0)
                {
                    if (keepOpen)
                        process.StartInfo.ArgumentList.Add("--hold");
                    process.StartInfo.ArgumentList.Add("-e");
                    process.StartInfo.ArgumentList.Add(commandName);
                    foreach (var arg in args)
                    {
                        process.StartInfo.ArgumentList.Add(arg);
                    }
                }
                process.Start();
            }
            else if (File.Exists(gnome_terminal))
            {

            }
            else if (File.Exists(xterm))
            {

            }
        }
        else if (OperatingSystem.IsWindows())
        {
            using Process process = new Process();
            process.StartInfo.FileName = GetRealPath("cmd.exe");
            if(commandName.Length > 0)
            process.StartInfo.ArgumentList.Add(keepOpen ? "/K" : "/C");
            process.StartInfo.CreateNoWindow = false;
            process.StartInfo.UseShellExecute = false;
            process.StartInfo.WorkingDirectory = workingDirectory;
            if(commandName.Length > 0)
            process.StartInfo.ArgumentList.Add(commandName);
            foreach (var item in args)
                process.StartInfo.ArgumentList.Add(item);
            process.Start();
        }
    }


    private static string GetCrossLangDirectory()
    {
        string path = CrossLangPath;
        if (string.IsNullOrWhiteSpace(path)) return "";
        using Process process = new Process();
        process.StartInfo.ArgumentList.Add("configdir");
        process.StartInfo.FileName = path;
        process.StartInfo.CreateNoWindow = true;
        process.StartInfo.RedirectStandardOutput = true;
        process.StartInfo.UseShellExecute = false;
        process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
        if (process.Start())
        {

            process.WaitForExit();
            var text = process.StandardOutput.ReadToEnd();
            return (text ?? "").Replace("\n", "").Replace("\r", "");
        }
        return "";
    }

    internal static bool CreateProject(string templateName, string path)
    {
        string cpath = CrossLangPath;
        if (string.IsNullOrWhiteSpace(cpath)) return false;
        using Process process = new Process();
        process.StartInfo.ArgumentList.Add("new");
        process.StartInfo.ArgumentList.Add(templateName);
        process.StartInfo.WorkingDirectory = path;
        process.StartInfo.FileName = cpath;
        process.StartInfo.CreateNoWindow = true;

        process.StartInfo.UseShellExecute = false;
        process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
        if (process.Start())
        {

            process.WaitForExit();
            return process.ExitCode == 0;
        }
        return false;
    }
}

public class CrossLangSettings
{
    [JsonProperty("prefered_terminal_command")]
    public string PreferedTerminalCommand { get; set; } = "";
    [JsonProperty("prefered_project_directory")]
    public string PreferedProjectDirectory { get; set; } = "";
    [Newtonsoft.Json.JsonIgnore]
    public string ProjectDirectory
    {
        get
        {
            if (!string.IsNullOrWhiteSpace(PreferedProjectDirectory))
                return PreferedProjectDirectory;

            string path = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), "CrossLangProjects");
            Directory.CreateDirectory(path);
            return path;
        }
    }

    
}