using System.Diagnostics;
using System.IO.Compression;
using System.Net.Http.Json;
using System.Reflection;
using System.Text.Json;
using Windows.Media.Protection.PlayReady;

namespace BlueberryUpdater
{
    internal class Program
    {
        static string appName = "Blueberry";
        static string updaterName = appName + "Updater";
        static string installPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles), appName);

        static void Main(string[] args)
        {
            if (Directory.Exists(installPath) && File.Exists(Path.Combine(installPath, appName + ".exe")))
                Uninstall();
            else
                Install();
        }

        private static void Uninstall()
        {
            Console.WriteLine("Would you like to uninstall Blueberry? [y/N]");
            var key = Console.ReadLine();
            if (key == null ||key.ToLower() != "y")
                return;

            var appdata = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), appName);

            Console.WriteLine("Removing Blueberry...");
            var dirs = Directory.GetDirectories(installPath);
            var files = Directory.GetFiles(installPath);
            var total = dirs.Length + files.Length;
            var i = 0;

            foreach (var dir in dirs)
            {
                i++;
                Directory.Delete(dir, true);
                DrawProgressBar((int)((double)i / total * 100), dir.Split('\\').Last());
            }

            foreach (var file in files)
            {
                i++;
                if (file.Split('\\').Last() == updaterName + ".exe")
                    continue;
                File.Delete(file);
                i++;
                DrawProgressBar((int)((double)i / total * 100), file.Split('\\').Last());
            }
            Directory.Delete(appdata, true);

            DrawProgressBar(100, "Done");
            Console.WriteLine();
            Console.WriteLine("Uninstall Complete!");

            Console.WriteLine("Press any key to exit...");
            Console.ReadKey();

            SelfDelete();
        }

        private static void Install()
        {
            try
            {
                var client = new HttpClient();
                client.DefaultRequestHeaders.UserAgent.ParseAdd("BlueberryUpdater");

                string releaseUrl = "https://git.technopunk.space/api/v1/repos/tomi/Blueberry/releases/latest";

                // 1. Fetch JSON
                var root = client.GetFromJsonAsync<JsonElement>(releaseUrl).ConfigureAwait(false).GetAwaiter().GetResult();

                // 2. Find URL for "payload.zip"
                string downloadUrl = root.GetProperty("assets")
                    .EnumerateArray()
                    .First(x => x.GetProperty("name").GetString() == "payload.zip")
                    .GetProperty("browser_download_url")
                    .GetString() ?? throw new NullReferenceException();

                Console.WriteLine("Downloading Blueberry...");
                var stream = DownloadFileWithProgressAsync(client, downloadUrl).GetAwaiter().GetResult();

                Console.WriteLine($"Installing to {installPath}...");

                // 1. Clean existing install if necessary
                if (Directory.Exists(installPath))
                {
                    Directory.Delete(installPath, true);
                }
                Directory.CreateDirectory(installPath);

                ExtractWithProgress(stream);
                MoveUpdater();

                Console.WriteLine();
                Console.WriteLine("Installation Complete!");

                // Optional: Create Shortcut logic here
            }
            catch (Exception ex)
            {
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine($"Error: {ex.Message}");
            }

            Console.WriteLine("Press any key to exit...");
            Console.ReadKey();
        }

        public static void SelfDelete()
        {
            string exePath = Process.GetCurrentProcess().MainModule.FileName;
            string directoryToDelete = Path.GetDirectoryName(exePath);

            string args = $"/C timeout /t 2 /nobreak > Nul & del \"{exePath}\" & rmdir /q \"{directoryToDelete}\"";

            ProcessStartInfo psi = new ProcessStartInfo
            {
                FileName = "cmd.exe",
                Arguments = args,
                WindowStyle = ProcessWindowStyle.Hidden,
                CreateNoWindow = true,
                UseShellExecute = false
            };

            Process.Start(psi);

            Environment.Exit(0);
        }

        public static void MoveUpdater()
        {
            string currentExe = Process.GetCurrentProcess().MainModule.FileName;

            var updaterPath = Path.Combine(installPath, updaterName + ".exe");

            Directory.CreateDirectory(Path.GetDirectoryName(updaterPath));
            File.Copy(currentExe, updaterPath, overwrite: true);
        }

        static void DrawProgressBar(int percent, string filename)
        {
            // Move cursor to start of line
            Console.CursorLeft = 0;

            // Limit filename length for clean display
            string shortName = filename.Length > 20 ? filename.Substring(0, 17) + "..." : filename.PadRight(20);

            Console.Write("[");
            int width = Console.WindowWidth - 21; // Width of the bar
            int progress = (int)((percent / 100.0) * width);

            // Draw filled part
            Console.Write(new string('#', progress));
            // Draw empty part
            Console.Write(new string('-', width - progress));

            Console.Write($"] {percent}% {shortName}");
        }

        static async Task<MemoryStream> DownloadFileWithProgressAsync(HttpClient client, string url)
        {
            // 1. Get headers only first to check size
            using var response = await client.GetAsync(url, HttpCompletionOption.ResponseHeadersRead);
            response.EnsureSuccessStatusCode();

            var totalBytes = response.Content.Headers.ContentLength ?? -1L;
            var canReportProgress = totalBytes != -1;

            using var contentStream = await response.Content.ReadAsStreamAsync();
            using var memoryStream = new MemoryStream();

            var buffer = new byte[8192];
            long totalRead = 0;
            int bytesRead;

            while ((bytesRead = await contentStream.ReadAsync(buffer, 0, buffer.Length)) > 0)
            {
                await memoryStream.WriteAsync(buffer, 0, bytesRead);
                totalRead += bytesRead;

                if (canReportProgress)
                    DrawProgressBar((int)((double)totalRead / totalBytes * 100), "Downloading...");
            }
            DrawProgressBar(100, "Done");
            return memoryStream;
        }
        static void ExtractWithProgress(MemoryStream stream)
        {
            using (ZipArchive archive = new(stream))
            {
                int totalEntries = archive.Entries.Count;
                int currentEntry = 0;

                foreach (ZipArchiveEntry entry in archive.Entries)
                {
                    currentEntry++;

                    // Calculate percentage
                    int percent = (int)((double)currentEntry / totalEntries * 100);

                    // Draw Progress Bar
                    DrawProgressBar(percent, entry.Name);

                    // Create the full path
                    string destinationPath = Path.GetFullPath(Path.Combine(installPath, entry.FullName));

                    // Security check: prevent ZipSlip (writing outside target folder)
                    if (!destinationPath.StartsWith(installPath, StringComparison.OrdinalIgnoreCase))
                        continue;

                    // Handle folders vs files
                    if (string.IsNullOrEmpty(entry.Name)) // It's a directory
                    {
                        Directory.CreateDirectory(destinationPath);
                    }
                    else // It's a file
                    {
                        // Ensure the directory exists (zipped files might not list their dir first)
                        Directory.CreateDirectory(Path.GetDirectoryName(destinationPath));
                        entry.ExtractToFile(destinationPath, overwrite: true);
                    }
                }
            }
            DrawProgressBar(100, "Done");
        }
    }
}