using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using HarmonyLib;
using MelonLoader;
using ScheduleOne.Growing;
using ScheduleOne.ItemFramework;
using ScheduleOne.ObjectScripts;
using UnityEngine;

[assembly: MelonInfo(typeof(AbsorbentSoil.AbsorbentSoilMod), "Absorbent Soil", "0.1.0", "AttilaG")]
[assembly: MelonGame(null, "Schedule I")]

namespace AbsorbentSoil
{
    public sealed class AbsorbentSoilMod : MelonMod
    {
        internal static bool VerboseLogging = false;

        public override void OnInitializeMelon()
        {
            MelonLogger.Msg("Absorbent Soil loaded. Additive retention is active for long-life soils.");
        }

        // This keeps slot/session bleed low if the player backs out and loads another save without restarting.
        // It does NOT persist anything to disk. It only tracks pots currently seen in the running game session.
        public override void OnSceneWasLoaded(int buildIndex, string sceneName)
        {
            if (!string.IsNullOrWhiteSpace(sceneName) &&
                (sceneName.IndexOf("menu", StringComparison.OrdinalIgnoreCase) >= 0 ||
                 sceneName.IndexOf("main", StringComparison.OrdinalIgnoreCase) >= 0 ||
                 sceneName.IndexOf("load", StringComparison.OrdinalIgnoreCase) >= 0))
            {
                AdditiveMemory.Clear();
                MelonLogger.Msg($"Cleared additive memory on scene load: {sceneName}");
            }
        }
    }

    internal static class AdditiveMemory
    {
        private static readonly Dictionary<string, HashSet<string>> AdditivesByPotKey = new();

        public static void Remember(Pot pot, string additiveId)
        {
            if (pot == null || string.IsNullOrWhiteSpace(additiveId))
                return;

            string key = PotKeyHelper.GetPotKey(pot);
            if (string.IsNullOrWhiteSpace(key))
                return;

            if (!AdditivesByPotKey.TryGetValue(key, out HashSet<string> set))
            {
                set = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
                AdditivesByPotKey[key] = set;
            }

            if (set.Add(additiveId) && AbsorbentSoilMod.VerboseLogging)
                MelonLogger.Msg($"Remembered additive '{additiveId}' for pot '{key}'.");
        }

        public static IReadOnlyList<string> Get(Pot pot)
        {
            if (pot == null)
                return Array.Empty<string>();

            string key = PotKeyHelper.GetPotKey(pot);
            if (string.IsNullOrWhiteSpace(key))
                return Array.Empty<string>();

            return AdditivesByPotKey.TryGetValue(key, out HashSet<string> set)
                ? set.ToArray()
                : Array.Empty<string>();
        }

        public static void Forget(Pot pot)
        {
            if (pot == null)
                return;

            string key = PotKeyHelper.GetPotKey(pot);
            if (!string.IsNullOrWhiteSpace(key))
                AdditivesByPotKey.Remove(key);
        }

        public static void Clear() => AdditivesByPotKey.Clear();
    }

    internal static class PotKeyHelper
    {
        public static string GetPotKey(Pot pot)
        {
            if (pot == null)
                return string.Empty;

            // Most Schedule I buildable/grid items have a GUID inherited from a base class.
            // Use reflection so this survives minor EA API shifts.
            object guid = ReadMember(pot, "GUID") ?? ReadMember(pot, "Guid") ?? ReadMember(pot, "guid");
            if (guid != null && !string.IsNullOrWhiteSpace(guid.ToString()))
                return guid.ToString();

            // Fallback for testing only. Not stable across reloads, but better than hard failing.
            return $"scene:{pot.GetInstanceID()}";
        }

        private static object ReadMember(object instance, string name)
        {
            if (instance == null || string.IsNullOrWhiteSpace(name))
                return null;

            Type type = instance.GetType();

            PropertyInfo prop = AccessTools.Property(type, name);
            if (prop != null)
            {
                try { return prop.GetValue(instance); } catch { }
            }

            FieldInfo field = AccessTools.Field(type, name);
            if (field != null)
            {
                try { return field.GetValue(instance); } catch { }
            }

            return null;
        }
    }

    internal static class SoilHelper
    {
        // Adjust these after checking the actual IDs/names from item definitions or Melon logs.
        // The helper checks IDs/names case-insensitively and allows partial matches.
        private static readonly string[] RetainingSoilTokens =
        {
            "longlife",
            "long_life",
            "long-life",
            "long life",
            "extralonglife",
            "extra_long_life",
            "extra-long-life",
            "extra long life"
        };

        public static bool IsRetainingSoil(Pot pot)
        {
            if (pot == null)
                return false;

            // In current Pot.cs, soil identity is probably on GrowContainer/PotData/base state rather than Pot itself.
            // Try several likely member names so the mod remains resilient to EA renames.
            foreach (string memberName in new[]
            {
                "SoilID", "soilID", "SoilId", "soilId",
                "SoilDefinition", "soilDefinition", "SoilItem", "soilItem",
                "Soil", "soil", "CurrentSoil", "currentSoil"
            })
            {
                object value = ReadMemberRecursive(pot, memberName);
                if (MatchesRetainingSoil(value))
                    return true;
            }

            // Last resort: inspect chunks/transforms/names. This is intentionally broad but only affects whether
            // additives are remembered/reapplied; if it is too broad, tighten RetainingSoilTokens above.
            string potName = SafeLower(pot.name);
            if (ContainsAnyToken(potName))
                return true;

            return false;
        }

        private static bool MatchesRetainingSoil(object value)
        {
            if (value == null)
                return false;

            if (ContainsAnyToken(SafeLower(value.ToString())))
                return true;

            foreach (string memberName in new[] { "ID", "Id", "Name", "name", "ItemID", "itemID", "Definition", "definition" })
            {
                object nested = ReadMemberRecursive(value, memberName);
                if (nested != null && ContainsAnyToken(SafeLower(nested.ToString())))
                    return true;
            }

            return false;
        }

        private static object ReadMemberRecursive(object instance, string name)
        {
            if (instance == null || string.IsNullOrWhiteSpace(name))
                return null;

            Type type = instance.GetType();

            while (type != null)
            {
                PropertyInfo prop = AccessTools.Property(type, name);
                if (prop != null)
                {
                    try { return prop.GetValue(instance); } catch { }
                }

                FieldInfo field = AccessTools.Field(type, name);
                if (field != null)
                {
                    try { return field.GetValue(instance); } catch { }
                }

                type = type.BaseType;
            }

            return null;
        }

        private static bool ContainsAnyToken(string text)
        {
            if (string.IsNullOrWhiteSpace(text))
                return false;

            return RetainingSoilTokens.Any(token => text.Contains(token));
        }

        private static string SafeLower(string value) => value == null ? string.Empty : value.ToLowerInvariant();
    }

    [HarmonyPatch(typeof(Pot), "ApplyAdditive")]
    internal static class Pot_ApplyAdditive_Patch
    {
        private static bool _suppressCapture;

        public static void Postfix(Pot __instance, AdditiveDefinition __result, string additiveID, bool isInitialApplication)
        {
            try
            {
                if (_suppressCapture)
                    return;

                if (__instance == null || __result == null || string.IsNullOrWhiteSpace(additiveID))
                    return;

                if (!SoilHelper.IsRetainingSoil(__instance))
                    return;

                AdditiveMemory.Remember(__instance, additiveID);
            }
            catch (Exception ex)
            {
                MelonLogger.Warning($"ApplyAdditive postfix failed: {ex}");
            }
        }

        public static void ReapplyWithoutRecapture(Pot pot, string additiveID)
        {
            if (pot == null || string.IsNullOrWhiteSpace(additiveID))
                return;

            MethodInfo applyAdditive = AccessTools.Method(typeof(Pot), "ApplyAdditive");
            if (applyAdditive == null)
            {
                MelonLogger.Warning("Could not find Pot.ApplyAdditive via reflection.");
                return;
            }

            try
            {
                _suppressCapture = true;
                applyAdditive.Invoke(pot, new object[] { additiveID, true });
            }
            catch (Exception ex)
            {
                MelonLogger.Warning($"Failed to reapply additive '{additiveID}': {ex}");
            }
            finally
            {
                _suppressCapture = false;
            }
        }
    }

    [HarmonyPatch(typeof(Plant), nameof(Plant.Initialize))]
    internal static class Plant_Initialize_Patch
    {
        public static void Postfix(Plant __instance)
        {
            try
            {
                if (__instance == null || __instance.Pot == null)
                    return;

                Pot pot = __instance.Pot;
                if (!SoilHelper.IsRetainingSoil(pot))
                    return;

                IReadOnlyList<string> additiveIds = AdditiveMemory.Get(pot);
                if (additiveIds.Count == 0)
                    return;

                foreach (string additiveId in additiveIds)
                    Pot_ApplyAdditive_Patch.ReapplyWithoutRecapture(pot, additiveId);

                MelonLogger.Msg($"Reapplied {additiveIds.Count} retained additive(s) to new plant in pot '{PotKeyHelper.GetPotKey(pot)}'.");
            }
            catch (Exception ex)
            {
                MelonLogger.Warning($"Plant.Initialize postfix failed: {ex}");
            }
        }
    }

    [HarmonyPatch(typeof(Pot), "OnPlantFullyHarvested")]
    internal static class Pot_OnPlantFullyHarvested_Patch
    {
        public static void Postfix(Pot __instance)
        {
            // Intentionally do nothing. This patch exists as a reminder that retained additives should survive harvest.
            // Do NOT clear AdditiveMemory here, because long-life/extra-long-life soil should carry additives forward.
        }
    }

    [HarmonyPatch(typeof(Pot), "Destroy")]
    internal static class Pot_Destroy_Patch
    {
        public static void Prefix(Pot __instance)
        {
            // If the pot itself is destroyed/sold, stop tracking its additives.
            try { AdditiveMemory.Forget(__instance); }
            catch { }
        }
    }
}