using RbxlReader.Chunks;
using RbxlReader.Instances;

/// <summary>
/// INST is a chunk that defines a Instance's class. Ex. Parts, Scripts and etc.
/// </summary>
public class INST : IChunkInfo {
    public BinaryChunkData Raw {get; set;}

    public string ClassName {get; protected set;} = "";
    public bool IsService { get; protected set; }
    public int Index {get; protected set;}

    public int InstanceCount {get; protected set;}
    public List<int> InstanceIds {get; protected set;} = new();
    /// <summary>
    /// Instances that share the exact class that's stated in INST.
    /// </summary>
    public Dictionary<int, Instance> LinkedInstances {get; protected set;} = new();

    public List<bool>? RootedServices;

    public INST(BinaryChunkData raw, bool loadNow = true) {
        Raw = raw;

        if (!loadNow) return;

        using (MemoryStream stream = new(raw.Data)) {
            Load(new RbxlBinaryReader(stream));
        }
    }

    public void Load(RbxlBinaryReader reader) {
        Index = reader.ReadInt32();
        ClassName = reader.ReadString();
        IsService = reader.ReadBoolean();

        InstanceCount = reader.ReadInt32();
        InstanceIds = reader.ReadInstanceIds(InstanceCount);

        if (IsService) {
            RootedServices = new List<bool>();

            for (int i = 0; i < InstanceCount; i++) {
                bool isRoot = reader.ReadBoolean();
                RootedServices.Add(isRoot);
            }
        }

        foreach (int id in InstanceIds) {
            Instance instance = new(ClassName, id);
            LinkedInstances.Add(id, instance);
        }
    }
}