using System.Text.RegularExpressions;

var exeDir = AppContext.BaseDirectory;

var solutionDir = FindContainingDir(exeDir, "ET.sln")
    ?? throw new InvalidOperationException("Cannot find ET.sln");

var srcDir = Path.GetFullPath(Path.Combine(solutionDir, "..", "docs", "Notes"));
var dstDir = Path.GetFullPath(Path.Combine(solutionDir, "Web", "wwwroot", "docs", "notes"));

Console.WriteLine($"Source: {srcDir}");
Console.WriteLine($"Destination: {dstDir}");

if (!Directory.Exists(srcDir))
{
    Console.Error.WriteLine($"Source directory not found: {srcDir}");
    return 1;
}

Directory.CreateDirectory(dstDir);

foreach (var file in Directory.GetFiles(dstDir))
    File.Delete(file);

var entries = new List<object>();

foreach (var file in Directory.EnumerateFiles(srcDir, "*.md"))
{
    var name = Path.GetFileNameWithoutExtension(file);
    var slug = Slugify(name);

    File.Copy(file, Path.Combine(dstDir, $"{slug}.md"), overwrite: true);

    string? category = null;
    var content = File.ReadAllText(file);
    var fmMatch = Regex.Match(content, @"^---\s*\n(.*?)\n---", RegexOptions.Singleline);
    if (fmMatch.Success)
    {
        var catMatch = Regex.Match(fmMatch.Groups[1].Value, @"(?m)^category:\s*(.+)$");
        if (catMatch.Success)
            category = catMatch.Groups[1].Value.Trim().Trim('"');
    }

    var entry = new Dictionary<string, object?>
    {
        ["slug"] = slug,
        ["title"] = name
    };
    if (category != null)
        entry["category"] = category;

    entries.Add(entry);
}

var index = new Dictionary<string, object> { ["notes"] = entries };
var json = System.Text.Json.JsonSerializer.Serialize(index, new System.Text.Json.JsonSerializerOptions
{
    WriteIndented = true
});

var indexPath = Path.Combine(Path.GetDirectoryName(dstDir)!, "notes-index.json");
File.WriteAllText(indexPath, json);

Console.WriteLine($"Copied {entries.Count} notes.");
Console.WriteLine($"Index written to: {indexPath}");
return 0;

static string Slugify(string name)
{
    var slug = name.ToLowerInvariant()
        .Replace("'", "")
        .Replace(".", "")
        .Replace("(", "")
        .Replace(")", "");
    slug = Regex.Replace(slug, @"[^a-z0-9 -]", "");
    slug = Regex.Replace(slug, @"\s+", "-");
    slug = Regex.Replace(slug, @"-+", "-");
    return slug.Trim('-');
}

static string? FindContainingDir(string startDir, string markerFile)
{
    var dir = new DirectoryInfo(startDir);
    while (dir != null)
    {
        if (File.Exists(Path.Combine(dir.FullName, markerFile)))
            return dir.FullName;
        dir = dir.Parent;
    }
    return null;
}