using System.IO.Compression;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace wp2ghost
{
	// =============================================================================
	// GhostExporter — Ghost ZIP erstellen
	// =============================================================================
	static class GhostExporter
	{
		private static string BaseDir = "";
		private static string MarkdownDir = "";

		public static int PostCount => PostFetcher.PostCount;

		public static void Init(string baseDir)
		{
			BaseDir = baseDir;
			MarkdownDir = Path.Combine(baseDir, "markdown");
		}

		public static async Task CreateZipAsync()
		{
			Console.WriteLine();
			Console.WriteLine("Erstelle Ghost ZIP-Datei...");

			var posts = PostFetcher.Posts;
			if (posts.Count == 0)
			{
				Console.WriteLine("Keine Beiträge geladen. Bitte zuerst Option 1 ausführen.");
				return;
			}

			string outputPath = Path.Combine(BaseDir, Importer.OutputZipPath);

			try
			{
				//PostFetcher.SaveAllMarkdownFiles();

				// Links zwischen den eigenen Beiträgen auf Ghost umschreiben (Kopie, Original bleibt unverändert)
				int internalLinks = 0;
				var exportPosts = posts.Select(p =>
				{
					var rewritten = InternalLinkManager.Rewrite(p.Html ?? "", Importer.WpBaseUrl, "__GHOST_URL__");
					internalLinks += rewritten.Replaced;
					return new GhostPost
					{
						Id = p.Id, Title = p.Title, Slug = p.Slug, Html = rewritten.Html, Markdown = p.Markdown,
						FeatureImage = p.FeatureImage, Status = p.Status, CreatedAt = p.CreatedAt, PublishedAt = p.PublishedAt
					};
				}).ToList();
				if (internalLinks > 0)
					Console.WriteLine($"  {internalLinks} interne(r) Link(s) auf Ghost umgeschrieben");

				string jsonString = JsonSerializer.Serialize(new GhostRoot
				{
					Db = new List<GhostDb> { new GhostDb { Data = new GhostData { Posts = exportPosts } } }
				}, new JsonSerializerOptions
				{
					WriteIndented = true,
					DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull
				});

				string outputDir = Path.GetDirectoryName(outputPath) ?? BaseDir;
				if (!Directory.Exists(outputDir))
					Directory.CreateDirectory(outputDir);

				using (var zipStream = new FileStream(outputPath, FileMode.Create))
				using (var archive = new ZipArchive(zipStream, ZipArchiveMode.Create, true))
				{
					var jsonEntry = archive.CreateEntry("import.json");
					using (var writer = new StreamWriter(jsonEntry.Open()))
					{
						await writer.WriteAsync(jsonString);
					}

					if (Directory.Exists(MarkdownDir))
					{
						foreach (string mdFile in Directory.GetFiles(MarkdownDir, "*.md", SearchOption.AllDirectories))
						{
							string relativeMdPath = Path.GetFileName(mdFile);
							var mdEntry = archive.CreateEntry($"content/{relativeMdPath}");
							using (var entryStream = mdEntry.Open())
							using (var fileStream = File.OpenRead(mdFile))
							{
								await fileStream.CopyToAsync(entryStream);
							}
						}
					}

					foreach (var file in ImageManager.CachedFiles)
					{
						string fullLocalPath = Path.Combine(Path.Combine(BaseDir, "images"), file.RelativePath);
						if (File.Exists(fullLocalPath))
						{
							var fileEntry = archive.CreateEntry($"content/images/{file.RelativePath}");
							using (var entryStream = fileEntry.Open())
							using (var fileStream = File.OpenRead(fullLocalPath))
							{
								await fileStream.CopyToAsync(entryStream);
							}
						}
					}

					// Videos unkomprimiert ablegen (MP4 lässt sich nicht weiter packen)
					foreach (var file in MediaManager.CachedFiles)
					{
						if (File.Exists(file.LocalPath))
						{
							var fileEntry = archive.CreateEntry($"content/media/{file.RelativePath}", CompressionLevel.NoCompression);
							using (var entryStream = fileEntry.Open())
							using (var fileStream = File.OpenRead(file.LocalPath))
							{
								await fileStream.CopyToAsync(entryStream);
							}
						}
					}
				}

				Console.WriteLine();
				Console.WriteLine("=========================================");
				Console.WriteLine($"  Ghost ZIP erstellt!");
				Console.WriteLine($"  Beiträge: {posts.Count}");
				Console.WriteLine($"  Bilder: {ImageManager.CachedFiles.Count} Dateien");
				Console.WriteLine($"  Videos: {MediaManager.CachedFiles.Count} Dateien");
				Console.WriteLine($"  Ausgabe: {outputPath}");
				Console.WriteLine("=========================================");
			}
			catch (Exception ex)
			{
				Console.WriteLine($"\nFehler beim Erstellen der ZIP-Datei: {ex.Message}");
				Console.WriteLine($"Stack Trace: {ex.StackTrace}");
			}
		}
	}
}