using System.Collections.Generic;
using System.Reflection;
using HarmonyLib;
using NitroxClient.Communication.Abstract;
using NitroxModel.DataStructures;
using NitroxModel.Helper;
using NitroxModel.Packets;
using NitroxPatcher.PatternMatching;
using UnityEngine;
using static System.Reflection.Emit.OpCodes;

namespace NitroxPatcher.Patches.Dynamic;

public sealed partial class ConstructableBase_SetState_Patch : NitroxPatch, IDynamicPatch
{
    public static readonly MethodInfo TARGET_METHOD = Reflect.Method((ConstructableBase t) => t.SetState(default, default));

    /*
     * Make it become
	 * if (Builder.CanDestroyObject(gameObject))
	 * {
	 *     ConstructableBase_SetState_Patch.BeforeDestroy(gameObject); <==========
	 *     UnityEngine.Object.Destroy(gameObject);
	 * }
     */
    public static readonly InstructionsPattern InstructionPattern = new()
    {
        new() { OpCode = Call, Operand = new(nameof(Builder), nameof(Builder.CanDestroyObject)) },
        { Brfalse, "Insert" }
    };

    public static readonly List<CodeInstruction> InstructionsToAdd = new()
    {
        TARGET_METHOD.Ldloc<GameObject>(),
        new(Call, Reflect.Method(() => BeforeDestroy(default)))
    };

    public static IEnumerable<CodeInstruction> Transpiler(MethodBase original, IEnumerable<CodeInstruction> instructions) =>
        instructions.Transform(InstructionPattern, (label, instruction) =>
        {
            if (label.Equals("Insert"))
            {
                return InstructionsToAdd;
            }
            return null;
        });

    public static void BeforeDestroy(GameObject gameObject)
    {
        if (gameObject && gameObject.TryGetNitroxId(out NitroxId nitroxId))
        {
            Resolve<IPacketSender>().Send(new EntityDestroyed(nitroxId));
        }
    }
}