using System;
using System.IO;
using System.Net.Http;
using System.Threading.Tasks;

namespace InstaSoftOfficeTool.Services
{
    public class OdtDownloader
    {
        // Direct CDN link to ODT setup.exe (no self-extractor needed)
        private const string OdtDownloadUrl = "https://officecdn.microsoft.com/pr/wsus/setup.exe";

        public event Action<string> StatusChanged;

        public string OdtFolder { get; private set; }
        public string SetupExePath { get; private set; }

        public OdtDownloader()
        {
            OdtFolder = Path.Combine(Path.GetTempPath(), "InstaSoftODT");
        }

        public async Task<bool> DownloadAndExtractAsync()
        {
            try
            {
                SetupExePath = Path.Combine(OdtFolder, "setup.exe");

                // Check if valid setup.exe already exists
                if (File.Exists(SetupExePath))
                {
                    var existingSize = new FileInfo(SetupExePath).Length;
                    if (existingSize > 1000000) // valid setup.exe is ~7MB
                    {
                        StatusChanged?.Invoke("Az ODT setup.exe m\u00e1r el\u00e9rhet\u0151 (" +
                            (existingSize / 1024 / 1024) + " MB).");
                        return true;
                    }

                    // Delete corrupted file
                    StatusChanged?.Invoke("S\u00e9r\u00fclt setup.exe t\u00f6rl\u00e9se...");
                    File.Delete(SetupExePath);
                }

                Directory.CreateDirectory(OdtFolder);

                // Download setup.exe directly from CDN
                StatusChanged?.Invoke("Office Deployment Tool let\u00f6lt\u00e9se...");
                StatusChanged?.Invoke("URL: " + OdtDownloadUrl);

                using (var handler = new HttpClientHandler { AllowAutoRedirect = true })
                using (var client = new HttpClient(handler))
                {
                    client.DefaultRequestHeaders.Add("User-Agent", "InstaSoftOfficeTool/1.0");
                    client.Timeout = TimeSpan.FromMinutes(5);

                    var response = await client.GetAsync(OdtDownloadUrl);

                    if (!response.IsSuccessStatusCode)
                    {
                        StatusChanged?.Invoke("Hiba: HTTP " + (int)response.StatusCode + " " + response.StatusCode);
                        return false;
                    }

                    var contentType = response.Content.Headers.ContentType?.MediaType ?? "";
                    if (contentType.Contains("text/html"))
                    {
                        StatusChanged?.Invoke("Hiba: HTML oldal \u00e9rkezett exe helyett.");
                        StatusChanged?.Invoke("T\u00f6ltse le manu\u00e1lisan: https://www.microsoft.com/en-us/download/details.aspx?id=49117");
                        return false;
                    }

                    var bytes = await response.Content.ReadAsByteArrayAsync();
                    File.WriteAllBytes(SetupExePath, bytes);

                    StatusChanged?.Invoke("Let\u00f6ltve: " + (bytes.Length / 1024) + " KB");
                }

                if (!File.Exists(SetupExePath) || new FileInfo(SetupExePath).Length < 1000000)
                {
                    StatusChanged?.Invoke("Hiba: A let\u00f6lt\u00f6tt f\u00e1jl s\u00e9r\u00fclt vagy t\u00fal kicsi.");
                    return false;
                }

                StatusChanged?.Invoke("ODT setup.exe k\u00e9sz.");
                return true;
            }
            catch (System.Net.Http.HttpRequestException ex)
            {
                StatusChanged?.Invoke("H\u00e1l\u00f3zati hiba: Nincs internetkapcsolat vagy a szerver nem el\u00e9rhet\u0151.");
                StatusChanged?.Invoke("R\u00e9szletek: " + ex.Message);
                return false;
            }
            catch (TaskCanceledException)
            {
                StatusChanged?.Invoke("Id\u0151t\u00fall\u00e9p\u00e9s: A let\u00f6lt\u00e9s t\u00fal sok\u00e1ig tartott. Ellen\u0151rizze az internetkapcsolatot.");
                return false;
            }
            catch (Exception ex)
            {
                StatusChanged?.Invoke("Hiba: " + ex.GetType().Name + ": " + ex.Message);
                return false;
            }
        }

        public async Task<int> RunSetupAsync(string configXmlPath, Action<string> outputCallback)
        {
            var runner = new ProcessRunner();
            runner.OutputReceived += line => outputCallback?.Invoke(line);

            StatusChanged?.Invoke("Office telep\u00edt\u00e9s ind\u00edt\u00e1sa...");
            return await runner.RunAsync(SetupExePath, "/configure \"" + configXmlPath + "\"");
        }

        public async Task<int> RunRemoveAsync(string configXmlPath, Action<string> outputCallback)
        {
            var runner = new ProcessRunner();
            runner.OutputReceived += line => outputCallback?.Invoke(line);

            StatusChanged?.Invoke("Office elt\u00e1vol\u00edt\u00e1s ind\u00edt\u00e1sa...");
            return await runner.RunAsync(SetupExePath, "/configure \"" + configXmlPath + "\"");
        }
    }
}