using System.Runtime.InteropServices;
using Newtonsoft.Json;
using Penumbra.GameData.Structs;
using Penumbra.Interop.Structs;
using Penumbra.Meta.Files;

namespace Penumbra.Meta.Manipulations;

[StructLayout( LayoutKind.Sequential, Pack = 1 )]
public readonly struct GmpManipulation : IMetaManipulation< GmpManipulation >
{
    public GmpEntry Entry { get; private init; }
    public SetId SetId { get; private init; }

    [JsonConstructor]
    public GmpManipulation( GmpEntry entry, SetId setId )
    {
        Entry = entry;
        SetId = setId;
    }

    public GmpManipulation Copy( GmpEntry entry )
        => new(entry, SetId);

    public override string ToString()
        => $"Gmp - {SetId}";

    public bool Equals( GmpManipulation other )
        => SetId == other.SetId;

    public override bool Equals( object? obj )
        => obj is GmpManipulation other && Equals( other );

    public override int GetHashCode()
        => SetId.GetHashCode();

    public int CompareTo( GmpManipulation other )
        => SetId.Id.CompareTo( other.SetId.Id );

    public MetaIndex FileIndex()
        => MetaIndex.Gmp;

    public bool Apply( ExpandedGmpFile file )
    {
        var entry = file[ SetId ];
        if( entry == Entry )
        {
            return false;
        }

        file[ SetId ] = Entry;
        return true;
    }

    public bool Validate()
    {
        // No known conditions.
        return true;
    }
}