namespace AnsonBot.Core;

/// <summary>A player as reported by Palworld's ShowPlayers command.</summary>
public record PalworldPlayer(string Name, string PlayerUid, string SteamId)
{
    /// <summary>
    /// Stable key for tracking. Prefers SteamId, falls back to PlayerUid, then
    /// name. Palworld sometimes reports "00000000" for a uid mid-connection.
    /// </summary>
    public string Id =>
        IsUsable(SteamId) ? SteamId :
        IsUsable(PlayerUid) ? PlayerUid :
        Name;

    private static bool IsUsable(string value) =>
        !string.IsNullOrWhiteSpace(value) && value.Trim('0').Length > 0;
}

public static class ShowPlayersParser
{
    /// <summary>
    /// Parses ShowPlayers output, which looks like:
    ///   name,playeruid,steamid
    ///   Sam,1234567890,76561198000000000
    /// Malformed or incomplete rows are skipped rather than throwing, because a
    /// single bad row shouldn't take down the polling loop.
    /// </summary>
    public static IReadOnlyList<PalworldPlayer> Parse(string raw)
    {
        if (string.IsNullOrWhiteSpace(raw))
            return Array.Empty<PalworldPlayer>();

        var players = new List<PalworldPlayer>();

        var lines = raw.Split('\n', StringSplitOptions.RemoveEmptyEntries)
                       .Select(l => l.Trim('\r', ' '))
                       .Where(l => l.Length > 0);

        foreach (var line in lines)
        {
            // Skip the header wherever it appears; rcon-cli sometimes echoes it.
            if (line.StartsWith("name,", StringComparison.OrdinalIgnoreCase))
                continue;

            // Names may contain commas, so split from the right: the last two
            // fields are uid and steamid, everything before is the name.
            var parts = line.Split(',');
            if (parts.Length < 3)
                continue;

            var steamId = parts[^1].Trim();
            var uid = parts[^2].Trim();
            var name = string.Join(',', parts[..^2]).Trim();

            if (string.IsNullOrWhiteSpace(name))
                continue;

            players.Add(new PalworldPlayer(name, uid, steamId));
        }

        return players;
    }
}