namespace Aeshnidae.Mule;

/// <summary>
/// The Companion wire contract, shared by every mod that answers the Aelrynth
/// Companion (a Decal plugin for the retail client). A mod cannot reference another
/// mod's types, so each provider keeps a verbatim copy of this file as
/// CompanionFeed.cs in its own namespace; keep them identical.
///
/// A data command (its name ends in "-data") answers with ONE chat line:
///
///     ~ael1 {"t":"inspect", ...}
///
/// the prefix, a space, then a JSON object whose "t" says what it is. The plugin
/// reads the line and hides it from the chat window; the numbers in it are the same
/// ones the matching human command prints (/inspect, /mastery), so every panel still
/// has a chat command underneath it and nothing becomes plugin-only.
///
/// Why a plain chat line and not the HUD feed's chat type 0x21: that type is above
/// every type the retail client knows, and a retail client is exactly who this is for.
/// Broadcast is what SendMessage uses; Decal sees it and can eat it before it is drawn.
/// Nothing is sent unless the client asked, so a player without the plugin only ever
/// sees a line of it by typing a -data command themselves.
///
/// Bump the "1" in the prefix only for a change an old plugin would misread; adding a
/// field is not one (the plugin ignores fields it does not know).
/// </summary>
public static class CompanionFeed
{
    public const string Prefix = "~ael1 ";

    // Fully qualified on purpose: this file is copied into mods with different usings.
    private static readonly System.Text.Json.JsonSerializerOptions Json = new()
    {
        Encoder = System.Text.Encodings.Web.JavaScriptEncoder.UnsafeRelaxedJsonEscaping,
        DefaultIgnoreCondition = System.Text.Json.Serialization.JsonIgnoreCondition.WhenWritingNull,
    };

    public static void Send(Session? session, object data)
    {
        if (session is null)
            return;

        var text = Prefix + System.Text.Json.JsonSerializer.Serialize(data, Json);
        session.Network.EnqueueSend(new GameMessageSystemChat(text, ChatMessageType.Broadcast));
    }
}