using System;
using HarmonyLib;
using UnityEngine;

namespace IdleSpectator;

/// <summary>Harmony hooks for Phase 2 deferred libraries (items, spells, decisions, subspecies).</summary>
[HarmonyPatch]
public static class DeferredEventPatches
{
    private static bool _spellCastInFlight;
    private static string _spellCastId;

    private static string _lastPowerId = "";
    private static float _lastPowerAt = -999f;

    [HarmonyPatch(typeof(ItemManager), nameof(ItemManager.generateItem))]
    [HarmonyPostfix]
    public static void PostfixGenerateItem(object __result, object[] __args)
    {
        if (AgentHarness.Busy)
        {
            return;
        }

        Actor craftsman = null;
        if (__args != null)
        {
            for (int i = 0; i < __args.Length; i++)
            {
                if (__args[i] is Actor a && a.isAlive())
                {
                    craftsman = a;
                    break;
                }
            }
        }

        string itemId = ReadAssetId(__result) ?? "item";
        if (craftsman == null)
        {
            return;
        }

        DeferredInterestFeed.EmitItem(itemId, craftsman);
    }

    [HarmonyPatch(typeof(ItemManager), "newItem")]
    [HarmonyPostfix]
    public static void PostfixNewItem(object __result)
    {
        // newItem may lack an actor; skip without a subject rather than invent one.
        if (AgentHarness.Busy || __result == null)
        {
            return;
        }

        Actor owner = ReadActorMember(__result, "owner", "actor", "creator", "getOwner");
        if (owner == null || !owner.isAlive())
        {
            return;
        }

        DeferredInterestFeed.EmitItem(ReadAssetId(__result) ?? "item", owner);
    }

    [HarmonyPatch(typeof(CombatActionLibrary), nameof(CombatActionLibrary.tryToCastSpell))]
    [HarmonyPrefix]
    public static void PrefixTryToCastSpell()
    {
        _spellCastInFlight = true;
        _spellCastId = null;
    }

    [HarmonyPatch(typeof(Actor), nameof(Actor.getRandomSpell))]
    [HarmonyPostfix]
    public static void PostfixGetRandomSpell(object __result)
    {
        if (!_spellCastInFlight || __result == null)
        {
            return;
        }

        string id = ReadAssetId(__result);
        if (!string.IsNullOrEmpty(id))
        {
            _spellCastId = id;
        }
    }

    [HarmonyPatch(typeof(CombatActionLibrary), nameof(CombatActionLibrary.tryToCastSpell))]
    [HarmonyPostfix]
    public static void PostfixTryToCastSpell(AttackData pData, bool __result)
    {
        _spellCastInFlight = false;
        if (!__result || AgentHarness.Busy)
        {
            _spellCastId = null;
            return;
        }

        Actor actor = null;
        try
        {
            BaseSimObject initiator = pData.initiator;
            if (initiator != null)
            {
                actor = initiator.a;
            }
        }
        catch
        {
            actor = null;
        }

        if (actor == null || !actor.isAlive())
        {
            try
            {
                object initiator = typeof(AttackData).GetField("initiator")?.GetValue(pData);
                actor = ReadActorMember(initiator, "a", "actor")
                        ?? (initiator as Actor);
            }
            catch
            {
                actor = null;
            }
        }

        if (actor == null || !actor.isAlive())
        {
            _spellCastId = null;
            return;
        }

        string spellId = _spellCastId;
        _spellCastId = null;
        if (string.IsNullOrEmpty(spellId))
        {
            spellId = ReadSpellFromAttackData(pData) ?? "spell";
        }

        DeferredInterestFeed.EmitSpell(spellId, actor);
    }

    [HarmonyPatch(typeof(PlayerControl), nameof(PlayerControl.clickedFinal))]
    [HarmonyPostfix]
    public static void PostfixClickedFinal(Vector2Int pPos, GodPower pPower)
    {
        if (AgentHarness.Busy)
        {
            return;
        }

        string powerId = null;
        if (pPower != null)
        {
            powerId = ReadAssetId(pPower);
            if (string.IsNullOrEmpty(powerId))
            {
                try
                {
                    powerId = pPower.name;
                }
                catch
                {
                    powerId = null;
                }
            }
        }

        if (string.IsNullOrEmpty(powerId))
        {
            try
            {
                object selected = World.world?.selected_power;
                powerId = ReadAssetId(selected);
                if (string.IsNullOrEmpty(powerId))
                {
                    powerId = World.world?.getSelectedPowerID();
                }
            }
            catch
            {
                powerId = null;
            }
        }

        if (string.IsNullOrEmpty(powerId))
        {
            return;
        }

        float now = Time.unscaledTime;
        if (string.Equals(powerId, _lastPowerId, StringComparison.OrdinalIgnoreCase)
            && now - _lastPowerAt < 1.5f)
        {
            return;
        }

        _lastPowerId = powerId;
        _lastPowerAt = now;

        Vector3 pos = TilePos(pPos);
        Actor near = pos != Vector3.zero ? EventFeedUtil.NearestUnit(pos, 48f) : null;
        DeferredInterestFeed.EmitPower(powerId, pos, near);
    }

    [HarmonyPatch(typeof(WorldLaws), nameof(WorldLaws.enable))]
    [HarmonyPostfix]
    public static void PostfixWorldLawEnable(string pID)
    {
        if (AgentHarness.Busy || string.IsNullOrEmpty(pID))
        {
            return;
        }

        DeferredInterestFeed.EmitWorldLaw(pID, CameraOrMapPos());
    }

    [HarmonyPatch(typeof(WorldLawAsset), nameof(WorldLawAsset.toggle))]
    [HarmonyPostfix]
    public static void PostfixWorldLawToggle(WorldLawAsset __instance, bool pState)
    {
        if (!pState || AgentHarness.Busy || __instance == null)
        {
            return;
        }

        string id = ReadAssetId(__instance) ?? __instance.id;
        if (string.IsNullOrEmpty(id))
        {
            return;
        }

        DeferredInterestFeed.EmitWorldLaw(id, CameraOrMapPos());
    }

    [HarmonyPatch(typeof(Subspecies), nameof(Subspecies.mutateFrom))]
    [HarmonyPostfix]
    public static void PostfixMutateFrom(Subspecies __instance)
    {
        if (AgentHarness.Busy || __instance == null)
        {
            return;
        }

        Actor anchor = FindUnitForSubspecies(__instance);
        if (anchor == null || !anchor.isAlive())
        {
            return;
        }

        // Prefer the mutation event id so ambient gene catalog entries do not suppress the emit.
        string geneId = "mutation";
        string nucleusGene = ReadNucleusGeneId(__instance);
        if (!string.IsNullOrEmpty(nucleusGene)
            && (nucleusGene.IndexOf("warfare", StringComparison.OrdinalIgnoreCase) >= 0
                || nucleusGene.IndexOf("magic", StringComparison.OrdinalIgnoreCase) >= 0
                || nucleusGene.IndexOf("mutation", StringComparison.OrdinalIgnoreCase) >= 0))
        {
            geneId = nucleusGene;
        }

        DeferredInterestFeed.EmitGene(geneId, anchor);
    }

    [HarmonyPatch(typeof(Actor), nameof(Actor.setDecisionCooldown))]
    [HarmonyPostfix]
    public static void PostfixSetDecisionCooldown(Actor __instance, object[] __args)
    {
        if (__instance == null || !__instance.isAlive() || AgentHarness.Busy)
        {
            return;
        }

        object pDecision = __args != null && __args.Length > 0 ? __args[0] : null;
        if (pDecision == null)
        {
            return;
        }

        string id = ReadAssetId(pDecision) ?? pDecision.ToString();
        if (string.IsNullOrEmpty(id))
        {
            return;
        }

        // High-frequency hook: only kingdom-affecting decisions, never idle AI ticks.
        if (!EventCatalog.Decision.IsCameraWorthy(id))
        {
            return;
        }

        DeferredInterestFeed.EmitDecision(id, __instance);
    }

    [HarmonyPatch(typeof(Actor), nameof(Actor.generatePhenotypeAndShade))]
    [HarmonyPostfix]
    public static void PostfixPhenotype(Actor __instance)
    {
        if (__instance == null || !__instance.isAlive() || AgentHarness.Busy)
        {
            return;
        }

        string id = "";
        try
        {
            object data = __instance.data;
            object ph = data?.GetType().GetField("phenotype")?.GetValue(data)
                        ?? data?.GetType().GetProperty("phenotype")?.GetValue(data, null);
            if (ph != null)
            {
                id = ph.ToString() ?? "";
            }
        }
        catch
        {
            id = "";
        }

        // Placeholder / empty ids are not camera events (catalog ambient is CreatesInterest=false).
        if (string.IsNullOrEmpty(id)
            || string.Equals(id, "phenotype", StringComparison.OrdinalIgnoreCase))
        {
            return;
        }

        DeferredInterestFeed.EmitPhenotype(id, __instance);
    }

    [HarmonyPatch(typeof(SubspeciesManager), "addRandomTraitFromBiomeToSubspecies")]
    [HarmonyPostfix]
    public static void PostfixSubspeciesTraitRandom(object[] __args)
    {
        object pSubspecies = __args != null && __args.Length > 0 ? __args[0] : null;
        EmitSubspecies(pSubspecies, "biome_trait");
    }

    [HarmonyPatch(typeof(SubspeciesManager), "addTraitsFromBiomeToSubspecies")]
    [HarmonyPostfix]
    public static void PostfixSubspeciesTraits(object[] __args)
    {
        object pSubspecies = __args != null && __args.Length > 0 ? __args[0] : null;
        EmitSubspecies(pSubspecies, "biome_traits");
    }

    private static void EmitSubspecies(object subspecies, string fallbackId)
    {
        if (AgentHarness.Busy || subspecies == null)
        {
            return;
        }

        Actor anchor = ReadActorMember(subspecies, "founder", "creator", "leader", "getFounder");
        if (anchor == null || !anchor.isAlive())
        {
            // Prefer a unit of this subspecies if possible.
            anchor = FindUnitForSubspecies(subspecies);
        }

        if (anchor == null)
        {
            return;
        }

        string traitId = fallbackId;
        try
        {
            object last = subspecies.GetType().GetField("last_trait")?.GetValue(subspecies)
                          ?? subspecies.GetType().GetProperty("last_trait")?.GetValue(subspecies, null);
            if (last != null)
            {
                traitId = ReadAssetId(last) ?? last.ToString() ?? fallbackId;
            }
        }
        catch
        {
            // ignore
        }

        DeferredInterestFeed.EmitSubspeciesTrait(traitId, anchor);
    }

    private static Actor FindUnitForSubspecies(object subspecies)
    {
        if (subspecies == null || World.world?.units == null)
        {
            return null;
        }

        string sid = null;
        try
        {
            object id = subspecies.GetType().GetMethod("getID")?.Invoke(subspecies, null)
                        ?? subspecies.GetType().GetProperty("id")?.GetValue(subspecies, null);
            sid = id?.ToString();
        }
        catch
        {
            sid = null;
        }

        try
        {
            foreach (Actor unit in World.world.units)
            {
                if (unit == null || !unit.isAlive())
                {
                    continue;
                }

                try
                {
                    object sub = unit.GetType().GetProperty("subspecies")?.GetValue(unit, null)
                                 ?? unit.GetType().GetField("subspecies")?.GetValue(unit);
                    if (sub == subspecies)
                    {
                        return unit;
                    }

                    if (!string.IsNullOrEmpty(sid))
                    {
                        object uid = sub?.GetType().GetMethod("getID")?.Invoke(sub, null);
                        if (uid != null && uid.ToString() == sid)
                        {
                            return unit;
                        }
                    }
                }
                catch
                {
                    // skip
                }
            }
        }
        catch
        {
            // ignore
        }

        return null;
    }

    private static string ReadSpellFromAttackData(AttackData pData)
    {
        try
        {
            Type type = typeof(AttackData);
            foreach (string name in new[] { "spell", "spell_asset", "pSpell", "current_spell", "last_spell" })
            {
                object value = type.GetField(name)?.GetValue(pData)
                               ?? type.GetProperty(name)?.GetValue(pData, null);
                string id = ReadAssetId(value);
                if (!string.IsNullOrEmpty(id))
                {
                    return id;
                }
            }
        }
        catch
        {
            // ignore
        }

        return null;
    }

    private static string ReadNucleusGeneId(Subspecies subspecies)
    {
        try
        {
            object nucleus = subspecies.nucleus;
            if (nucleus == null)
            {
                return null;
            }

            object chromosomes = nucleus.GetType().GetField("chromosomes")?.GetValue(nucleus)
                                 ?? nucleus.GetType().GetProperty("chromosomes")?.GetValue(nucleus, null);
            if (chromosomes is not System.Collections.IEnumerable list)
            {
                return null;
            }

            foreach (object chrome in list)
            {
                if (chrome == null)
                {
                    continue;
                }

                object genes = chrome.GetType().GetField("genes")?.GetValue(chrome)
                               ?? chrome.GetType().GetProperty("genes")?.GetValue(chrome, null);
                if (genes is not System.Collections.IEnumerable geneList)
                {
                    continue;
                }

                foreach (object gene in geneList)
                {
                    string id = ReadAssetId(gene);
                    if (!string.IsNullOrEmpty(id)
                        && !id.Equals("empty", StringComparison.OrdinalIgnoreCase)
                        && !id.Contains("void"))
                    {
                        return id;
                    }
                }
            }
        }
        catch
        {
            // ignore
        }

        return null;
    }

    private static Vector3 TilePos(Vector2Int pPos)
    {
        try
        {
            WorldTile tile = World.world?.GetTile(pPos.x, pPos.y)
                             ?? World.world?.GetTileSimple(pPos.x, pPos.y);
            if (tile != null)
            {
                object posObj = tile.GetType().GetField("posV3")?.GetValue(tile)
                                ?? tile.GetType().GetProperty("posV3")?.GetValue(tile, null)
                                ?? tile.GetType().GetField("pos")?.GetValue(tile)
                                ?? tile.GetType().GetProperty("pos")?.GetValue(tile, null)
                                ?? tile.GetType().GetField("position")?.GetValue(tile)
                                ?? tile.GetType().GetProperty("position")?.GetValue(tile, null);
                if (posObj is Vector3 v)
                {
                    return v;
                }

                if (posObj is Vector2 v2)
                {
                    return new Vector3(v2.x, v2.y, 0f);
                }
            }
        }
        catch
        {
            // fall through
        }

        return new Vector3(pPos.x, pPos.y, 0f);
    }

    private static Vector3 CameraOrMapPos()
    {
        try
        {
            if (MoveCamera.instance != null)
            {
                Vector3 p = MoveCamera.instance.transform.position;
                if (p != Vector3.zero)
                {
                    return new Vector3(p.x, p.y, 0f);
                }
            }
        }
        catch
        {
            // ignore
        }

        try
        {
            if (Camera.main != null)
            {
                Vector3 p = Camera.main.transform.position;
                return new Vector3(p.x, p.y, 0f);
            }
        }
        catch
        {
            // ignore
        }

        return Vector3.zero;
    }

    private static string ReadAssetId(object obj)
    {
        if (obj == null)
        {
            return null;
        }

        try
        {
            if (obj is string s)
            {
                return s;
            }

            object asset = obj.GetType().GetField("asset")?.GetValue(obj)
                           ?? obj.GetType().GetProperty("asset")?.GetValue(obj, null)
                           ?? obj.GetType().GetMethod("getAsset")?.Invoke(obj, null);
            if (asset != null)
            {
                object id = asset.GetType().GetField("id")?.GetValue(asset)
                            ?? asset.GetType().GetProperty("id")?.GetValue(asset, null);
                if (id != null)
                {
                    return id.ToString();
                }
            }

            object direct = obj.GetType().GetField("id")?.GetValue(obj)
                            ?? obj.GetType().GetProperty("id")?.GetValue(obj, null);
            return direct?.ToString();
        }
        catch
        {
            return null;
        }
    }

    private static Actor ReadActorMember(object target, params string[] names)
    {
        if (target == null || names == null)
        {
            return null;
        }

        Type type = target.GetType();
        foreach (string name in names)
        {
            try
            {
                var prop = type.GetProperty(name);
                if (prop != null && typeof(Actor).IsAssignableFrom(prop.PropertyType))
                {
                    return prop.GetValue(target, null) as Actor;
                }

                var field = type.GetField(name);
                if (field != null && typeof(Actor).IsAssignableFrom(field.FieldType))
                {
                    return field.GetValue(target) as Actor;
                }

                var method = type.GetMethod(name, Type.EmptyTypes);
                if (method != null && typeof(Actor).IsAssignableFrom(method.ReturnType))
                {
                    return method.Invoke(target, null) as Actor;
                }
            }
            catch
            {
                // try next
            }
        }

        return null;
    }
}