using System.Diagnostics;
using System.IO;
using System.Reflection;

namespace Flow.Launcher.Infrastructure
{
    public static class Constant
    {
        public const string FlowLauncher = "Flow.Launcher";
        public const string FlowLauncherFullName = "Flow Launcher";
        public const string Plugins = "Plugins";
        public const string PluginMetadataFileName = "plugin.json";

        public const string ApplicationFileName = FlowLauncher + ".exe";

        private static readonly Assembly Assembly = Assembly.GetExecutingAssembly();
        public static readonly string ProgramDirectory = Directory.GetParent(Assembly.Location.NonNull()).ToString();
        public static readonly string ExecutablePath = Path.Combine(ProgramDirectory, FlowLauncher + ".exe");
        public static readonly string ApplicationDirectory = Directory.GetParent(ProgramDirectory).ToString();
        public static readonly string RootDirectory = Directory.GetParent(ApplicationDirectory).ToString();
        
        public static readonly string PreinstalledDirectory = Path.Combine(ProgramDirectory, Plugins);
        public const string IssuesUrl = "https://github.com/Flow-Launcher/Flow.Launcher/issues";
        public static readonly string Version = FileVersionInfo.GetVersionInfo(Assembly.Location.NonNull()).ProductVersion;
        public static readonly string Dev = "Dev";
        public const string Documentation = "https://flowlauncher.com/docs/#/usage-tips";

        public static readonly int ThumbnailSize = 64;
        private static readonly string ImagesDirectory = Path.Combine(ProgramDirectory, "Images");
        public static readonly string DefaultIcon = Path.Combine(ImagesDirectory, "app.png");
        public static readonly string ErrorIcon = Path.Combine(ImagesDirectory, "app_error.png");
        public static readonly string MissingImgIcon = Path.Combine(ImagesDirectory, "app_missing_img.png");
        public static readonly string LoadingImgIcon = Path.Combine(ImagesDirectory, "loading.png");
        public static readonly string ImageIcon = Path.Combine(ImagesDirectory, "image.png");
        public static readonly string HistoryIcon = Path.Combine(ImagesDirectory, "history.png");

        public static string PythonPath;
        public static string NodePath;

        public static readonly string QueryTextBoxIconImagePath = $"{ProgramDirectory}\\Images\\mainsearch.svg";

        public const string DefaultTheme = "Win11Light";

        public const string Light = "Light";
        public const string Dark = "Dark";
        public const string System = "System";

        public const string Themes = "Themes";
        public const string Settings = "Settings";
        public const string Logs = "Logs";
        public const string Cache = "Cache";

        public const string Website = "https://flowlauncher.com";
        public const string SponsorPage = "https://github.com/sponsors/Flow-Launcher";
        public const string GitHub = "https://github.com/Flow-Launcher/Flow.Launcher";
        public const string Docs = "https://flowlauncher.com/docs";

        public const string SystemLanguageCode = "system";

        /// <summary>
        /// Resolves a path that may be relative to an absolute path.
        /// If the path is already absolute, returns it as-is.
        /// If the path is relative (starts with . or doesn't contain a drive), resolves it relative to ProgramDirectory.
        /// </summary>
        /// <param name="path">The path to resolve</param>
        /// <returns>An absolute path</returns>
        public static string ResolveAbsolutePath(string path)
        {
            if (string.IsNullOrEmpty(path))
                return path;

            // If already absolute, return as-is
            if (Path.IsPathRooted(path))
                return path;

            // Resolve relative to ProgramDirectory
            return Path.GetFullPath(Path.Combine(ProgramDirectory, path));
        }

        /// <summary>
        /// Converts an absolute path to a relative path if it's within ProgramDirectory.
        /// This enables portability by storing paths relative to the program directory when possible.
        /// </summary>
        /// <param name="absolutePath">The absolute path to convert</param>
        /// <returns>A relative path if the path is within ProgramDirectory, otherwise the original absolute path</returns>
        public static string ConvertToRelativePathIfPossible(string absolutePath)
        {
            if (string.IsNullOrEmpty(absolutePath))
                return absolutePath;

            if (!Path.IsPathRooted(absolutePath))
                return absolutePath;

            try
            {
                // Get the full absolute paths for comparison
                var fullAbsolutePath = Path.GetFullPath(absolutePath);
                var fullProgramDir = Path.GetFullPath(ProgramDirectory);

                // Check if the absolute path is within ProgramDirectory
                if (fullAbsolutePath.StartsWith(fullProgramDir, StringComparison.OrdinalIgnoreCase))
                {
                    // Convert to relative path
                    var relativePath = Path.GetRelativePath(fullProgramDir, fullAbsolutePath);
                    
                    // Prefix with .\ for clarity
                    if (!relativePath.StartsWith("."))
                        relativePath = ".\\" + relativePath;
                    
                    return relativePath;
                }
            }
            catch
            {
                // If conversion fails, return the original path
            }

            return absolutePath;
        }
    }
}