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

namespace CrossLangDevStudio;


class CrossLangShell
{
    public static string PackageServerFile = Path.Combine(CrossLangConfigDirectory, "package_servers.json");
    public static List<string> GetServers()
    {
        if (File.Exists(PackageServerFile))
        {
            var res = JsonConvert.DeserializeObject<List<string>>(File.ReadAllText(PackageServerFile));
            if (res is not null) return res;
        }
        return ["https://cpkg.tesseslanguage.com/"];
    }
    public static string[] ProjectTypes { get; } = ["console", "lib", "webapp", "template", "compile_tool", "tool", "archive"];
    public static string[] ProjectProperTypes { get; } = ["Console Application", "Library", "Web Application", "Template", "Compile Tool", "Tool", "Archive"];
    private static void EscapeBashElement(StringBuilder builder, string val)
    {
        builder.Append("\"");
        foreach (var item in val)
        {
            switch (item)
            {
                case '$':
                case '`':
                case '\\':
                case '\"':
                case '!':
                    builder.Append('\\');
                    builder.Append(item);
                    break;
                default:
                    builder.Append(item);
                    break;
            }
        }
        builder.Append("\"");
    }
    private static string EscapeBashCommand(string name, string[] args)
    {
        StringBuilder builder = new StringBuilder();
        EscapeBashElement(builder, name);
        foreach (var item in args)
        {
            builder.Append(' ');
            EscapeBashElement(builder, item);
        }
        builder.Append(" ; read -p \"Press Enter to close.\"");
        return builder.ToString();
    }

    private static string EscapeMacBashCommand(string workDir, bool keepOpen, string name, string[] args)
    {
        StringBuilder builder = new StringBuilder();
        builder.Append("cd ");
        EscapeBashElement(builder, workDir);
        builder.Append(" ; ");
        EscapeBashElement(builder, name);
        foreach (var item in args)
        {
            builder.Append(' ');
            EscapeBashElement(builder, item);
        }
        if (keepOpen)
            builder.Append(" ; read -p \"Press Enter to close.\"");
        return builder.ToString();
    }
    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)
    {
        var paths = (Environment.GetEnvironmentVariable("PATH") ?? "").Split(Path.PathSeparator).ToList();
        var execDir = Environment.ProcessPath;
        if (execDir is not null)
        {
            var dir = Path.GetDirectoryName(execDir);
            if (dir is not null)
                paths.Add(dir);
        }
        foreach (var item in paths)
        {
            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 PushProjectInFolder(string folder)
    {
        OpenTerminal(false, folder, CrossLangPath, "upload-package");
    }
    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 alacritty = GetRealPath("alacritty");
            string konsole = GetRealPath("konsole");
            string gnome_terminal = GetRealPath("gnome-terminal");
            string mate_terminal = GetRealPath("mate-terminal");
            string lxterminal = GetRealPath("lxterminal");
            string deepin_terminal = GetRealPath("deepin-terminal");
            string xfce_terminal = GetRealPath("xfce4-terminal");

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

            else if (File.Exists(mate_terminal))
            {
                using Process process = new Process();
                process.StartInfo.WorkingDirectory = workingDirectory;
                process.StartInfo.FileName = mate_terminal;
                process.StartInfo.UseShellExecute = false;
                if (commandName.Length != 0)
                {
                    process.StartInfo.ArgumentList.Add("--");
                    if (keepOpen)
                    {
                        process.StartInfo.ArgumentList.Add("bash");
                        process.StartInfo.ArgumentList.Add("-c");
                        process.StartInfo.ArgumentList.Add(EscapeBashCommand(commandName, args));
                    }
                    else
                    {
                        process.StartInfo.ArgumentList.Add(commandName);
                        foreach (var arg in args)
                        {
                            process.StartInfo.ArgumentList.Add(arg);
                        }
                    }
                }
                process.Start();
            }
            else if (File.Exists(lxterminal))
            {
                using Process process = new Process();
                process.StartInfo.WorkingDirectory = workingDirectory;
                process.StartInfo.FileName = lxterminal;
                process.StartInfo.UseShellExecute = false;
                if (commandName.Length != 0)
                {
                    process.StartInfo.ArgumentList.Add("-e");
                    if (keepOpen)
                    {
                        process.StartInfo.ArgumentList.Add("bash");
                        process.StartInfo.ArgumentList.Add("-c");
                        process.StartInfo.ArgumentList.Add(EscapeBashCommand(commandName, args));
                    }
                    else
                    {
                        process.StartInfo.ArgumentList.Add(commandName);
                        foreach (var arg in args)
                        {
                            process.StartInfo.ArgumentList.Add(arg);
                        }
                    }
                }
                process.Start();
            }

            else if (File.Exists(deepin_terminal))
            {
                using Process process = new Process();
                process.StartInfo.WorkingDirectory = workingDirectory;
                process.StartInfo.FileName = deepin_terminal;
                process.StartInfo.UseShellExecute = false;
                if (commandName.Length != 0)
                {
                    if (keepOpen)
                        process.StartInfo.ArgumentList.Add("--keep-open");
                    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(xterm))
            {
                using Process process = new Process();
                process.StartInfo.WorkingDirectory = workingDirectory;
                process.StartInfo.FileName = xterm;
                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 (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);
            if (commandName.Length > 0)
                foreach (var item in args)
                    process.StartInfo.ArgumentList.Add(item);
            process.Start();
        }
        else if (OperatingSystem.IsMacOS())
        {
            using Process process = new Process();
            process.StartInfo.WorkingDirectory = workingDirectory;
            process.StartInfo.FileName = GetRealPath("open");
            process.StartInfo.UseShellExecute = false;
            if (commandName.Length != 0)
            {
                process.StartInfo.ArgumentList.Add("-b");
                process.StartInfo.ArgumentList.Add("com.apple.terminal");
                if (keepOpen)
                {
                    process.StartInfo.ArgumentList.Add("bash");
                    process.StartInfo.ArgumentList.Add("-c");
                    process.StartInfo.ArgumentList.Add(EscapeMacBashCommand(workingDirectory, keepOpen, commandName, args));
                }
                else
                {
                    process.StartInfo.ArgumentList.Add(commandName);
                    foreach (var arg in args)
                    {
                        process.StartInfo.ArgumentList.Add(arg);
                    }
                }
            }
            process.Start();
        }
    }

    public static async Task RunCommandAsync(string workingDirectory, string commandName, params string[] args)
    {
        using Process process = new();
        process.StartInfo.WorkingDirectory = workingDirectory;
        process.StartInfo.FileName = GetRealPath(commandName);
        process.StartInfo.CreateNoWindow = true;
        process.StartInfo.UseShellExecute = false;
        process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
        foreach (var arg in args)
            process.StartInfo.ArgumentList.Add(arg);

        if (process.Start()) await process.WaitForExitAsync();
    }

    private static string GetCrossLangDirectory()
    {

        string path = CrossLangPath;
        if (string.IsNullOrWhiteSpace(path)) return "";
         using Process process0 = new Process();
        process0.StartInfo.ArgumentList.Add("configdir");
        process0.StartInfo.FileName = path;
        process0.StartInfo.CreateNoWindow = true;
        process0.StartInfo.RedirectStandardOutput = true;
        process0.StartInfo.UseShellExecute = false;
        process0.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
        process0.StartInfo.RedirectStandardInput = true;
        if (process0.Start())
        {
            process0.StandardInput.WriteLine("y");
            process0.WaitForExit();
            var text = process0.StandardOutput.ReadToEnd();
            return (text ?? "").Replace("\n", "").Replace("\r", "");
        }
        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 "";
    }

    public async Task<string> GetReferenceAsync()
    {
        await RunCommandAsync(Environment.CurrentDirectory, "crosslang", "docs", "--reference");
         string path = CrossLangPath;
        if (string.IsNullOrWhiteSpace(path)) return "";
        using Process process = new Process();
        process.StartInfo.ArgumentList.Add("docs");
        process.StartInfo.ArgumentList.Add("--reference-path");
        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 static async Task PublishAsync(string project, string identifier, string prefix, string outputDir)
    {
        List<string> args = new List<string>();
        args.Add("publish");
        args.Add($"--runtime-package-prefix={prefix}");
        if (!string.IsNullOrWhiteSpace(outputDir))
            args.Add($"--out={outputDir}");
        args.Add(identifier);

        await RunCommandAsync(project,"crosslang",args.ToArray());
    }
}

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;
        }
    }

    
}