using System.Reflection;
using HarmonyLib;
using UnityEngine;

namespace NecromancerTome
{
	/// <summary>
	/// Mod entry point. The game finds this by scanning every assembly dropped in a
	/// Mods/&lt;ModFolder&gt;/ directory for a type implementing IModApi.
	/// </summary>
	public class ModEntry : IModApi
	{
		/// <summary>The mod's own folder, kept from InitMod so patches can find files we ship
		/// (currently Resources/necroatlas for the custom block paint). Nothing else knows where
		/// the mod lives - the game hands it over exactly once, right here.</summary>
		public static Mod Instance;

		public void InitMod(Mod _modInstance)
		{
			Instance = _modInstance;
			var harmony = new Harmony("necromancertome.harmony");
			harmony.PatchAll(Assembly.GetExecutingAssembly());
			PetFollowPatch.Init();
			// PyramidWardPatch.cs's TEFeaturePyramidWard needs no Init() call - it's discovered
			// automatically by the engine's own TileEntityCompositeData reflection scan (see that
			// file's class doc comment), not registered here like PetFollowPatch's UnityUpdate hook.

			// Diagnostic-only, added 2026-08-28 while chasing "VictimPatch never logs anything at
			// all for dropItemOnDeath, even though decompiling EntityAlive.OnEntityDeath()
			// confirms it's called unconditionally right after the 'killed by' line seen in the
			// log". This checks, at load time, whether Harmony actually attached our Prefix to
			// that method at all - rules "patch never applied" in or out without waiting on
			// another in-game death.
			VerifyPrefixAttached(typeof(EntityAlive), "dropItemOnDeath");
			VerifyPrefixAttached(typeof(Entity), "DropBagServer");
		}

		public static void VerifyPrefixAttached(System.Type type, string methodName)
		{
			MethodBase method = AccessTools.Method(type, methodName);
			if (method == null)
			{
				Debug.LogWarning("[NecromancerTome] ModEntry: could not resolve " + type.Name + "." + methodName + " via AccessTools - method not found");
				return;
			}
			Patches info = Harmony.GetPatchInfo(method);
			int prefixCount = info != null && info.Prefixes != null ? info.Prefixes.Count : 0;
			Debug.Log("[NecromancerTome] ModEntry: " + type.Name + "." + methodName + " resolved, has " + prefixCount + " prefix patch(es) attached after PatchAll");
		}
	}
}