using System;
using System.Collections.Generic;
using ai.behaviours;
using HarmonyLib;

namespace IdleSpectator;

/// <summary>
/// Relationship lifecycle sensors. Thin Harmony only - outcomes confirmed via
/// <see cref="EventOutcome"/> / <see cref="EventObservation"/> before Emit.
/// Prefer state setters (<c>setLover</c>, <c>setParent*</c>, <c>newFamily</c>) over Beh Continue.
/// </summary>
[HarmonyPatch]
public static class RelationshipEventPatches
{
    /// <summary>
    /// Vanilla <c>Family.isFull</c> NREs when <c>getActorAsset()</c> is null (broken/zombie family).
    /// Treat as full so <c>getNearbyFamily</c> skips instead of spamming AI exceptions.
    /// </summary>
    [HarmonyPatch(typeof(Family), nameof(Family.isFull))]
    [HarmonyPrefix]
    public static bool PrefixIsFull(Family __instance, ref bool __result)
    {
        try
        {
            if (__instance == null || __instance.getActorAsset() == null)
            {
                __result = true;
                return false;
            }
        }
        catch
        {
            __result = true;
            return false;
        }

        return true;
    }

    [HarmonyPatch(typeof(Actor), nameof(Actor.setLover))]
    [HarmonyPrefix]
    public static void PrefixSetLover(Actor __instance, Actor pActor, out Actor __state)
    {
        __state = null;
        try
        {
            if (__instance != null && EventOutcome.IsLiving(__instance) && __instance.hasLover())
            {
                __state = __instance.lover;
            }
        }
        catch
        {
            __state = null;
        }

        _ = pActor;
    }

    [HarmonyPatch(typeof(Actor), nameof(Actor.setLover))]
    [HarmonyPostfix]
    public static void PostfixSetLover(Actor __instance, Actor pActor, Actor __state)
    {
        if (!EventOutcome.IsLiving(__instance))
        {
            return;
        }

        // setLover is already the confirmed state transition.
        if (pActor == null)
        {
            LifeSagaMemory.RecordBondBroken(__instance, __state, "setLover(null)");
            RelationshipInterestFeed.Emit("clear_lover", __instance, null);
            return;
        }

        LifeSagaMemory.RecordBondFormed(__instance, pActor, "setLover");
        RelationshipInterestFeed.Emit("set_lover", __instance, pActor);
    }

    /// <summary>
    /// Surviving partners clear dead lovers by field assignment in
    /// <see cref="MapBox.checkEventUnitsDestroy"/>, which bypasses <see cref="Actor.setLover"/>.
    /// Emit clear_lover for the living partner before those fields are nulled.
    /// </summary>
    [HarmonyPatch(typeof(MapBox), "checkEventUnitsDestroy")]
    [HarmonyPrefix]
    public static void PrefixDeadLoverCleanup(MapBox __instance)
    {
        try
        {
            if (__instance == null || __instance.units == null || !__instance.units.event_destroy)
            {
                return;
            }

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

                    Actor lover = unit.lover;
                    if (lover == null)
                    {
                        continue;
                    }

                    bool loverAlive = false;
                    try
                    {
                        loverAlive = lover.isAlive();
                    }
                    catch
                    {
                        loverAlive = false;
                    }

                    if (loverAlive)
                    {
                        continue;
                    }

                    LifeSagaMemory.RecordBondBroken(unit, lover, "dead_lover_cleanup");
                    RelationshipInterestFeed.Emit("clear_lover", unit, null);
                }
                catch
                {
                    // never break vanilla destroy cleanup
                }
            }
        }
        catch
        {
            // never break vanilla destroy cleanup
        }
    }

    /// <summary>
    /// Real parent/child link. Vanilla <c>addChild</c> attaches avatar components (Dragon, Boat), not kids.
    /// </summary>
    [HarmonyPatch(typeof(Actor), nameof(Actor.setParent1))]
    [HarmonyPostfix]
    public static void PostfixSetParent1(Actor __instance, Actor pParentActor, bool pIncreaseChildren)
    {
        EmitAddChild(pParentActor, __instance, pIncreaseChildren);
    }

    [HarmonyPatch(typeof(Actor), nameof(Actor.setParent2))]
    [HarmonyPostfix]
    public static void PostfixSetParent2(Actor __instance, Actor pActor, bool pIncreaseChildren)
    {
        EmitAddChild(pActor, __instance, pIncreaseChildren);
    }

    private static void EmitAddChild(Actor parent, Actor child, bool increaseChildren)
    {
        EventObservation.Confirm(
            "setParent",
            "add_child",
            increaseChildren
            && EventOutcome.IsLiving(parent)
            && EventOutcome.IsLiving(child),
            () =>
            {
                LifeSagaMemory.RecordParentChild(parent, child);
                RelationshipInterestFeed.Emit("add_child", parent, child);
            });
    }

    [HarmonyPatch(typeof(FamilyManager), nameof(FamilyManager.newFamily))]
    [HarmonyPostfix]
    public static void PostfixNewFamily(Family __result, Actor pActor)
    {
        Actor anchor = EventOutcome.IsLiving(pActor) ? pActor : null;
        if (anchor != null)
        {
            string familyKey = "";
            try
            {
                familyKey = __result != null ? __result.getID().ToString() : "";
            }
            catch
            {
                familyKey = "";
            }

            LifeSagaMemory.RecordFounding(anchor, "family", familyKey, "new_family");
        }

        RelationshipInterestFeed.EmitFamily("new_family", __result, anchor);
    }

    private static Actor _familyRemoveAnchor;

    /// <summary>
    /// Emit before remove tears membership down. Postfix is too late for member lookup.
    /// </summary>
    [HarmonyPatch(typeof(FamilyManager), "removeObject", new Type[] { typeof(Family) })]
    [HarmonyPrefix]
    public static void PrefixRemoveFamily(Family pObject)
    {
        if (pObject == null)
        {
            return;
        }

        Actor anchor = _familyRemoveAnchor;
        _familyRemoveAnchor = null;
        if (anchor == null || !anchor.isAlive())
        {
            anchor = ResolveFamilyRemoveAnchor(pObject);
        }

        if (anchor != null)
        {
            RelationshipInterestFeed.EmitFamily("family_removed", pObject, anchor);
        }
    }

    /// <summary>Optional harness/pre-call hint when membership lists are still dirty.</summary>
    public static void NoteFamilyRemoveAnchor(Actor anchor)
    {
        _familyRemoveAnchor = anchor != null && anchor.isAlive() ? anchor : null;
    }

    private static Actor ResolveFamilyRemoveAnchor(Family family)
    {
        try
        {
            if (family.units != null)
            {
                for (int i = 0; i < family.units.Count; i++)
                {
                    Actor unit = family.units[i];
                    if (unit != null && unit.isAlive())
                    {
                        return unit;
                    }
                }
            }
        }
        catch
        {
            // fall through
        }

        try
        {
            Actor founder = family.getFounderFirst() ?? family.getFounderSecond();
            if (founder != null && founder.isAlive())
            {
                return founder;
            }
        }
        catch
        {
            // fall through
        }

        try
        {
            List<Actor> alive = World.world?.units?.units_only_alive;
            if (alive == null)
            {
                return null;
            }

            for (int i = 0; i < alive.Count; i++)
            {
                Actor unit = alive[i];
                try
                {
                    if (unit != null && unit.isAlive() && unit.hasFamily() && unit.family == family)
                    {
                        return unit;
                    }
                }
                catch
                {
                    // keep scanning
                }
            }
        }
        catch
        {
            // ignore
        }

        return null;
    }

    [HarmonyPatch(typeof(ActorManager), "createBabyActorFromData")]
    [HarmonyPostfix]
    public static void PostfixCreateBaby(Actor __result)
    {
        EventObservation.Confirm(
            "createBaby",
            "baby_created",
            EventOutcome.IsLiving(__result),
            () => RelationshipInterestFeed.Emit("baby_created", __result, null));
    }

    /// <summary>
    /// Seeking only. Beh Continue is not success - confirm still !hasLover.
    /// Success is covered by set_lover / love status.
    /// </summary>
    [HarmonyPatch(typeof(BehFindLover), nameof(BehFindLover.execute))]
    [HarmonyPostfix]
    public static void PostfixFindLover(Actor pActor, BehResult __result)
    {
        EventObservation.Confirm(
            "BehFindLover",
            "find_lover",
            EventOutcome.StillSeekingLover(pActor, __result),
            () => RelationshipInterestFeed.Emit("find_lover", pActor, null));
    }

    [HarmonyPatch(typeof(BehFamilyGroupNew), nameof(BehFamilyGroupNew.execute))]
    [HarmonyPrefix]
    public static void PrefixFamilyNew(Actor pActor, out EventOutcome.ActorFlags __state)
    {
        __state = EventOutcome.Snapshot(pActor);
    }

    [HarmonyPatch(typeof(BehFamilyGroupNew), nameof(BehFamilyGroupNew.execute))]
    [HarmonyPostfix]
    public static void PostfixFamilyNew(Actor pActor, BehResult __result, EventOutcome.ActorFlags __state)
    {
        // Shares founding key with new_family when both fire.
        EventObservation.ConfirmAfter(
            "BehFamilyGroupNew",
            "family_group_new",
            __state,
            pActor,
            __result,
            (before, actor, result) =>
                EventOutcome.BehaviourRan(result) && EventOutcome.GainedFamily(before, actor),
            () => RelationshipInterestFeed.Emit(
                "family_group_new",
                pActor,
                ActorRelation.ResolvePackRelated(pActor)));
    }

    [HarmonyPatch(typeof(BehFamilyGroupJoin), nameof(BehFamilyGroupJoin.execute))]
    [HarmonyPrefix]
    public static void PrefixFamilyJoin(Actor pActor, out EventOutcome.ActorFlags __state)
    {
        __state = EventOutcome.Snapshot(pActor);
    }

    [HarmonyPatch(typeof(BehFamilyGroupJoin), nameof(BehFamilyGroupJoin.execute))]
    [HarmonyPostfix]
    public static void PostfixFamilyJoin(Actor pActor, BehResult __result, EventOutcome.ActorFlags __state)
    {
        // Vanilla returns Continue even when getNearbyFamily was null - require GainedFamily.
        // Emit is on setFamily(null→family) only when we choose; Beh path emits here.
        EventObservation.ConfirmAfter(
            "BehFamilyGroupJoin",
            "family_group_join",
            __state,
            pActor,
            __result,
            (before, actor, result) =>
                EventOutcome.BehaviourRan(result) && EventOutcome.GainedFamily(before, actor),
            () => RelationshipInterestFeed.Emit(
                "family_group_join",
                pActor,
                ActorRelation.ResolvePackRelated(pActor)));
    }

    /// <summary>
    /// Leave is <c>setFamily(null)</c> (Beh leave and any other clear). Prefer this over
    /// Beh Continue alone so harness and vanilla share one state sensor.
    /// </summary>
    [HarmonyPatch(typeof(Actor), nameof(Actor.setFamily))]
    [HarmonyPrefix]
    public static void PrefixSetFamily(Actor __instance, Family pObject, out Family __state)
    {
        __state = null;
        try
        {
            if (__instance != null && __instance.hasFamily())
            {
                __state = __instance.family;
            }
        }
        catch
        {
            __state = null;
        }

        _ = pObject;
    }

    [HarmonyPatch(typeof(Actor), nameof(Actor.setFamily))]
    [HarmonyPostfix]
    public static void PostfixSetFamily(Actor __instance, Family pObject, Family __state)
    {
        if (pObject != null || __state == null || !EventOutcome.IsLiving(__instance))
        {
            return;
        }

        RelationshipInterestFeed.Emit(
            "family_group_leave",
            __instance,
            ActorRelation.ResolvePackRelated(__instance));
    }

    [HarmonyPatch(typeof(BehFamilyGroupLeave), nameof(BehFamilyGroupLeave.execute))]
    [HarmonyPrefix]
    public static void PrefixFamilyLeave(Actor pActor, out EventOutcome.ActorFlags __state)
    {
        __state = EventOutcome.Snapshot(pActor);
    }

    [HarmonyPatch(typeof(BehFamilyGroupLeave), nameof(BehFamilyGroupLeave.execute))]
    [HarmonyPostfix]
    public static void PostfixFamilyLeave(Actor pActor, BehResult __result, EventOutcome.ActorFlags __state)
    {
        // Emit already fired from setFamily(null). Only log unconfirmed Continues.
        EventObservation.ConfirmAfter(
            "BehFamilyGroupLeave",
            "family_group_leave",
            __state,
            pActor,
            __result,
            (before, actor, result) =>
                EventOutcome.BehaviourRan(result) && EventOutcome.LostFamily(before, actor),
            () => { /* setFamily(null) already emitted */ });
    }

    /// <summary>
    /// Alpha succession is happiness-gated by emotions in vanilla. Patch the family API so
    /// animals without emotions still get a Layer A / Activity-capable beat.
    /// </summary>
    [HarmonyPatch(typeof(Family), "setAlpha")]
    [HarmonyPostfix]
    public static void PostfixSetAlpha(Actor pActor, bool pNew)
    {
        EventObservation.Confirm(
            "Family.setAlpha",
            "become_alpha",
            pNew && EventOutcome.IsLiving(pActor),
            () =>
            {
                LifeSagaMemory.RecordRole(pActor, "become_alpha", "family_set_alpha");
                InterestFeeds.EmitAlpha(pActor, "family_set_alpha");
            });
    }
}