namespace Aeshnidae.Leaderboard;

/// <summary>
/// The leaderboards in the Aeshnidae Codex: your standing first, then the top five
/// of every board, two boards a page. Found by Aeshnidae.Codex through reflection.
/// </summary>
public static class CodexPage
{
    public static string Title => "Leaderboards";

    public static string[] Pages(Player player)
    {
        if (player is null || !Db.Ready || Boards.Snapshot.Count == 0)
            return Array.Empty<string>();

        var pages = new List<string>();

        var me = new StringBuilder();
        me.AppendLine("LEADERBOARDS");
        me.AppendLine();
        me.AppendLine($"{Boards.CharacterCount} characters. Where you stand:");
        me.AppendLine();

        foreach (var board in Boards.All)
        {
            var pos = Boards.Position(board.Key, player.Name);
            if (pos is not null)
                me.AppendLine($"{board.Title}: #{pos.Rank}, {pos.Value:N0}");
        }

        me.AppendLine();
        me.AppendLine("/top <board> for the full list.");
        pages.Add(me.ToString().TrimEnd());

        var sb = new StringBuilder();
        var onPage = 0;

        foreach (var board in Boards.All)
        {
            if (!Boards.Snapshot.TryGetValue(board.Key, out var rows) || rows.Count == 0)
                continue;

            if (onPage == 2)
            {
                pages.Add(sb.ToString().TrimEnd());
                sb.Clear();
                onPage = 0;
            }

            sb.AppendLine(board.Title.ToUpperInvariant());
            foreach (var row in rows.Take(5))
                sb.AppendLine($"{row.Rank}. {row.Name}: {row.Value:N0}");
            sb.AppendLine();
            onPage++;
        }

        if (sb.Length > 0)
            pages.Add(sb.ToString().TrimEnd());

        return pages.ToArray();
    }
}