using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using SPT.Reflection.Patching;
using SPT.Reflection.Utils;
using Comfort.Common;
using EFT;
using EFT.Game.Spawning;
using UnityEngine;

namespace SPT.SinglePlayer.Patches.RaidFix
{
    /// <summary>
    /// An empty EntryPoint string (string_0 in BaseLocalGame) causes exfil point initialization to be skipped.
    /// This patch sets an EntryPoint string if it's missing.
    /// </summary>
    public class EmptyInfilFixPatch : ModulePatch
    {
        protected override MethodBase GetTargetMethod()
        {
            var desiredType = PatchConstants.LocalGameType.BaseType;
            var desiredMethod = desiredType
                .GetMethods(BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly | BindingFlags.CreateInstance)
                .SingleCustom(IsTargetMethod);

            Logger.LogDebug($"{this.GetType().Name} Type: {desiredType?.Name}");
            Logger.LogDebug($"{this.GetType().Name} Method: {desiredMethod?.Name}");

            return desiredMethod;
        }

        private static bool IsTargetMethod(MethodInfo methodInfo)
        {
            return (methodInfo.IsVirtual
                    && methodInfo.GetParameters().Length == 0
                    && methodInfo.ReturnType == typeof(void)
                    && methodInfo.GetMethodBody().LocalVariables.Count > 0);
        }

        [PatchPrefix]
        public static void PatchPrefix(ref string ___string_0)
        {
            if (!string.IsNullOrWhiteSpace(___string_0)) return;

            var spawnPoints = Resources.FindObjectsOfTypeAll<SpawnPointMarker>().ToList();

            List<SpawnPointMarker> filtered = new List<SpawnPointMarker>();

            foreach (var spawn in spawnPoints)
            {
                if (!string.IsNullOrEmpty(spawn?.SpawnPoint?.Infiltration?.Trim()))
                {
                    filtered.Add(spawn);
                }
            }

            var playerPos = Singleton<GameWorld>.Instance.MainPlayer.Transform.position;
            SpawnPointMarker closestSpawn = null;
            var minDist = Mathf.Infinity;

            foreach (var filter in filtered)
            {
                var dist = Vector3.Distance(filter.gameObject.transform.position, playerPos);

                if (dist < minDist)
                {
                    closestSpawn = filter;
                    minDist = dist;
                }
            }

            ___string_0 = closestSpawn.SpawnPoint.Infiltration;
        }
    }
}