using Microsoft.Extensions.Configuration;

namespace URLNotesGrabberCORE
{
    // Port of ThreeTxtFileHelper RunOutputMode + WritePostToFile + RenameExistingTxtFilesToBak.
    // For each Blog with a TTFolderPath, renames any existing .txt files in that folder to .bak,
    // then writes one .txt per PostType containing all posts of that type (date-sorted, fixed
    // field order). Reads from TL.db via DataAccess.GetAllPostsForBlog.
    public static class OutputMode
    {
        public static int Run(IConfiguration config)
        {
            DataAccess.EnsureTTFileHelperColumnsExist();

            var blogs = DataAccess.GetAllBlogsWithTTFolderPath();
            Console.WriteLine($"Found {blogs.Count} blog(s) to process.");

            foreach (var (blogName, ttFolderPath) in blogs)
            {
                Console.WriteLine($"\nProcessing blog: {blogName}");

                if (string.IsNullOrWhiteSpace(ttFolderPath) || !Directory.Exists(ttFolderPath))
                {
                    Console.WriteLine($"  TTFolderPath does not exist or is not set. Skipping.");
                    continue;
                }

                Console.WriteLine($"  TTFolderPath: {ttFolderPath}");

                try
                {
                    foreach (var bakFile in Directory.GetFiles(ttFolderPath, "*.bak"))
                        File.Delete(bakFile);
                }
                catch (Exception ex)
                {
                    Console.WriteLine($"  Error deleting .bak files: {ex.Message}");
                }

                RenameExistingTxtFilesToBak(ttFolderPath);

                var posts = DataAccess.GetAllPostsForBlog(blogName);
                Console.WriteLine($"  Found {posts.Count} post(s) for this blog.");

                var grouped = posts.GroupBy(p => p.PostType ?? "Unknown");
                foreach (var typeGroup in grouped)
                {
                    string postType = typeGroup.Key ?? "Unknown";
                    string outputFilePath = Path.Combine(ttFolderPath, $"{postType}.txt");
                    var ordered = typeGroup.OrderBy(p => p.Date).ToList();
                    Console.WriteLine($"    Writing {ordered.Count} post(s) to {postType}.txt");

                    using var writer = new StreamWriter(outputFilePath, false, System.Text.Encoding.UTF8);
                    bool isFirst = true;
                    foreach (var post in ordered)
                    {
                        if (!isFirst)
                        {
                            writer.WriteLine();
                            writer.WriteLine();
                        }
                        WritePostToFile(writer, post);
                        isFirst = false;
                    }
                }
            }

            Console.WriteLine("\nOutput mode complete.");
            return 0;
        }

        private static void RenameExistingTxtFilesToBak(string folderPath)
        {
            try
            {
                foreach (var txtFile in Directory.GetFiles(folderPath, "*.txt"))
                {
                    string bakPath = Path.ChangeExtension(txtFile, ".bak");
                    if (File.Exists(bakPath)) File.Delete(bakPath);
                    File.Move(txtFile, bakPath, overwrite: true);
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"    Error renaming txt files to .bak: {ex.Message}");
            }
        }

        private static void WritePostToFile(StreamWriter writer, TTPostRecord post)
        {
            var startColumns = new[] { "Post ID", "Date", "Post URL", "Slug", "Reblog Key", "Reblog URL", "Reblog Name", "Title", "Body" };
            var endColumns = new[] { "Tags", "Downloaded Files" };

            var columns = new Dictionary<string, string>();
            if (!string.IsNullOrWhiteSpace(post.PostId)) columns["Post ID"] = post.PostId;
            if (!string.IsNullOrWhiteSpace(post.Date)) columns["Date"] = post.Date!;
            if (!string.IsNullOrWhiteSpace(post.PostUrl)) columns["Post URL"] = post.PostUrl!;
            if (!string.IsNullOrWhiteSpace(post.Slug)) columns["Slug"] = post.Slug!;
            if (!string.IsNullOrWhiteSpace(post.ReblogKey)) columns["Reblog Key"] = post.ReblogKey!;
            if (!string.IsNullOrWhiteSpace(post.ReblogUrl)) columns["Reblog URL"] = post.ReblogUrl!;
            if (!string.IsNullOrWhiteSpace(post.ReblogName)) columns["Reblog Name"] = post.ReblogName!;
            if (!string.IsNullOrWhiteSpace(post.Title)) columns["Title"] = post.Title!;
            if (!string.IsNullOrWhiteSpace(post.Body)) columns["Body"] = post.Body!;
            if (!string.IsNullOrWhiteSpace(post.HasImage)) columns["Has Image"] = post.HasImage!;
            if (!string.IsNullOrWhiteSpace(post.Summary)) columns["Summary"] = post.Summary!;
            if (!string.IsNullOrWhiteSpace(post.Quote)) columns["Quote"] = post.Quote!;
            if (!string.IsNullOrWhiteSpace(post.Link)) columns["Link"] = post.Link!;
            if (!string.IsNullOrWhiteSpace(post.PhotoUrl)) columns["Photo URL"] = post.PhotoUrl!;
            if (!string.IsNullOrWhiteSpace(post.PhotoCaption)) columns["Photo Caption"] = post.PhotoCaption!;
            if (!string.IsNullOrWhiteSpace(post.AudioCaption)) columns["Audio Caption"] = post.AudioCaption!;
            if (!string.IsNullOrWhiteSpace(post.Question)) columns["Question"] = post.Question!;
            if (!string.IsNullOrWhiteSpace(post.Answer)) columns["Answer"] = post.Answer!;
            if (!string.IsNullOrWhiteSpace(post.Tags)) columns["Tags"] = post.Tags!;
            if (!string.IsNullOrWhiteSpace(post.DownloadedFiles)) columns["Downloaded Files"] = post.DownloadedFiles!;

            foreach (var col in startColumns)
            {
                if (columns.ContainsKey(col))
                {
                    writer.WriteLine($"{col}: {columns[col]}");
                    columns.Remove(col);
                }
            }

            var remaining = columns.Keys.Where(k => !endColumns.Contains(k)).OrderBy(k => k).ToList();
            foreach (var col in remaining)
                writer.WriteLine($"{col}: {columns[col]}");

            foreach (var col in endColumns)
            {
                if (columns.ContainsKey(col))
                    writer.WriteLine($"{col}: {columns[col]}");
            }
        }
    }
}