using System.Text;
using System.Text.Encodings.Web;
using System.Text.Json;
using System.Text.RegularExpressions;
using System.Text.Json.Serialization;

var repoRoot = Path.GetFullPath(Path.Combine(AppContext.BaseDirectory, "..", "..", "..", "..", ".."));
var docsDir = Path.Combine(repoRoot, "chrono.docs");
var webWwwRoot = Path.Combine(repoRoot, "Chrono", "Web", "wwwroot");

Console.WriteLine($"Repo root: {repoRoot}");
Console.WriteLine($"Docs dir: {docsDir}");
Console.WriteLine($"Web wwwroot: {webWwwRoot}");

if (!Directory.Exists(docsDir))
{
    Console.Error.WriteLine($"ERROR: docs dir not found: {docsDir}");
    return 1;
}

var mdFiles = Directory.GetFiles(docsDir, "*.md");
var cards = new List<CardData>();

foreach (var file in mdFiles)
{
    var content = Encoding.UTF8.GetString(File.ReadAllBytes(file));
    if (!content.StartsWith("---"))
        continue;

    var endIndex = content.IndexOf("---", 3, StringComparison.Ordinal);
    if (endIndex < 0)
        continue;

    var frontmatter = content[3..endIndex].Trim();
    var yaml = ParseYaml(frontmatter);

    var name = Path.GetFileNameWithoutExtension(file);
    var category = yaml.GetValueOrDefault("category");
    if (category == null) continue;

    var card = new CardData
    {
        Name = name,
        Category = category,
        Cost = ParseInt(yaml, "cost"),
        Attack = ParseInt(yaml, "attack"),
        Health = ParseInt(yaml, "health"),
        Description = StripWikiLinks(yaml.GetValueOrDefault("description")),
        Faction = StripWikiLink(yaml.GetValueOrDefault("faction")),
        Set = StripWikiLink(yaml.GetValueOrDefault("set")),
        Speed = StripWikiLink(yaml.GetValueOrDefault("speed")),
        Archetypes = ParseList(yaml, "archetypes").Select(s => StripWikiLink(s) ?? "").Where(s => s != "").ToList(),
        ImmortalizeTo = yaml.ContainsKey("immortalizeTo") ? ParseListOrScalar(yaml, "immortalizeTo").Select(s => StripWikiLink(s) ?? "").Where(s => s != "").ToList() : null,
        ImmortalizeFrom = StripWikiLink(yaml.GetValueOrDefault("immortalizeFrom")),
        ImmortalizeWhen = NullIfNa(StripWikiLinks(yaml.GetValueOrDefault("immortalizeWhen"))),
        ImageFile = StripWikiLink(yaml.GetValueOrDefault("imageLink")),
    };

    if (card.ImageFile != null && !card.ImageFile.EndsWith(".png"))
        card.ImageFile += ".png";

    cards.Add(card);
}

// Copy PNGs to wwwroot/cards
var cardsDir = Path.Combine(webWwwRoot, "cards");
Directory.CreateDirectory(cardsDir);
foreach (var card in cards)
{
    if (card.ImageFile == null) continue;
    var src = Path.Combine(docsDir, card.ImageFile);
    var dst = Path.Combine(cardsDir, card.ImageFile);
    if (File.Exists(src))
        File.Copy(src, dst, overwrite: true);
}

// Write cards.json
var output = new { cards };
var json = JsonSerializer.Serialize(output, new JsonSerializerOptions
{
    WriteIndented = true,
    PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
    DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
    Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping,
});
var jsonPath = Path.Combine(webWwwRoot, "sample-data", "cards.json");
File.WriteAllText(jsonPath, json);

Console.WriteLine($"Processed {cards.Count} cards");
Console.WriteLine($"Written to {jsonPath}");
return 0;

// --- Helpers ---

static int? ParseInt(Dictionary<string, string> yaml, string key)
{
    if (!yaml.TryGetValue(key, out var val)) return null;
    if (int.TryParse(val, out var i)) return i;
    return null;
}

static string? StripWikiLink(string? s)
{
    if (s == null || s == "N/A") return null;
    return Regex.Replace(s, @"\[\[([^\]]*)\]\]", "$1").Trim('"');
}

static string? NullIfNa(string? s) => s is "N/A" or null ? null : s.Trim('"');

static string? StripWikiLinks(string? s)
{
    if (s == null || s == "N/A") return null;
    return Regex.Replace(s.Trim('"'), @"\[\[([^\]]*)\]\]", "$1").Trim();
}

static List<string> ParseList(Dictionary<string, string> yaml, string key)
{
    if (!yaml.TryGetValue(key, out var raw)) return [];
    var result = new List<string>();
    foreach (var item in raw.Split('\n', StringSplitOptions.RemoveEmptyEntries))
    {
        var trimmed = item.TrimStart('-', ' ').Trim(' ', '"');
        if (trimmed.Length > 0) result.Add(trimmed);
    }
    return result;
}

static List<string> ParseListOrScalar(Dictionary<string, string> yaml, string key)
{
    if (!yaml.TryGetValue(key, out var raw)) return [];
    raw = raw.Trim();
    if (!raw.StartsWith('-'))
        return [raw.Trim('"')];

    var result = new List<string>();
    foreach (var item in raw.Split('\n', StringSplitOptions.RemoveEmptyEntries))
    {
        var trimmed = item.TrimStart('-', ' ').Trim(' ', '"');
        if (trimmed.Length > 0) result.Add(trimmed);
    }
    return result;
}

static Dictionary<string, string> ParseYaml(string yaml)
{
    var dict = new Dictionary<string, string>();
    var lines = yaml.Split('\n');
    string? currentKey = null;
    var listBuffer = new List<string>();

    foreach (var line in lines)
    {
        var trimmed = line.Trim();
        if (trimmed.Length == 0) continue;

        if (trimmed.StartsWith("- "))
        {
            listBuffer.Add(trimmed);
            continue;
        }

        if (listBuffer.Count > 0 && currentKey != null)
        {
            dict[currentKey] = string.Join("\n", listBuffer);
            listBuffer.Clear();
        }

        var colonIndex = trimmed.IndexOf(':');
        if (colonIndex < 0) continue;

        currentKey = trimmed[..colonIndex].Trim();
        var value = trimmed[(colonIndex + 1)..].Trim();

        if (value.Length == 0)
        {
            // Could be a list or multi-line value starting on next line
            continue;
        }

        dict[currentKey] = value;
    }

    if (listBuffer.Count > 0 && currentKey != null)
        dict[currentKey] = string.Join("\n", listBuffer);

    return dict;
}

record CardData
{
    [JsonPropertyName("name")] public string Name { get; set; } = "";
    [JsonPropertyName("category")] public string Category { get; set; } = "";
    [JsonPropertyName("cost")] public int? Cost { get; set; }
    [JsonPropertyName("attack")] public int? Attack { get; set; }
    [JsonPropertyName("health")] public int? Health { get; set; }
    [JsonPropertyName("description")] public string? Description { get; set; }
    [JsonPropertyName("faction")] public string? Faction { get; set; }
    [JsonPropertyName("set")] public string? Set { get; set; }
    [JsonPropertyName("speed")] public string? Speed { get; set; }
    [JsonPropertyName("archetypes")] public List<string>? Archetypes { get; set; }
    [JsonPropertyName("immortalizeTo")] public List<string>? ImmortalizeTo { get; set; }
    [JsonPropertyName("immortalizeFrom")] public string? ImmortalizeFrom { get; set; }
    [JsonPropertyName("immortalizeWhen")] public string? ImmortalizeWhen { get; set; }
    [JsonPropertyName("imageFile")] public string? ImageFile { get; set; }
}