using Cielonos.MainGame.Characters;
using Cielonos.MainGame.FunctionalAnimation;
using SLSUtilities.General;
using UnityEngine;

namespace Cielonos.MainGame.Inventory.Collections
{
    /// <summary>
    /// Aleph 级支援装备：持续重掷 Luck、Curse、最终伤害倍率和敌方强力动作抗性。
    /// </summary>
    public class ChaosPact : SupportEquipmentBase
    {
        /// <summary>
        /// 混沌契约每次重掷属性和伤害倍率的间隔。
        /// </summary>
        private const float RefreshInterval = 0.1f;
        private const float MinimumDamageMultiplier = 0f;
        private const float MaximumDamageMultiplier = 2f;
        private const string ResistanceResolverKey = nameof(ChaosPact);

        private float _refreshTimer;
        private bool _isResistanceResolverRegistered;

        public override bool CanUnequip => false;

        public override void Initialize()
        {
            base.Initialize();
            if (activeAttributeData != null)
            {
                activeAttributeSm = new AttributeSubmodule(this, activeAttributeData);
            }
        }

        public override void OnEquipped()
        {
            base.OnEquipped();
            RegisterResistanceResolver();
            _refreshTimer = 0f;
            RefreshChaosState();
        }

        public override void OnUnequipped()
        {
            UnregisterResistanceResolver();
            RemoveChaosModifiers();
            base.OnUnequipped();
        }

        protected override void Update()
        {
            if (!player.inventorySc.equipmentSm.currentSupportEquipments.Contains(this)) return;

            base.Update();

            _refreshTimer += player.selfTimeSm.DeltaTime;
            if (_refreshTimer < RefreshInterval) return;

            _refreshTimer %= RefreshInterval;
            RefreshChaosState();
        }

        private void RefreshChaosState()
        {
            if (activeAttributeSm == null) return;

            // 当前版本将 Luck 和 Curse 作为契约的运行时数值来源；未来可替换为正式的属性覆盖层。
            activeAttributeSm.charAttrNumericChange[CharacterAttribute.Luck] = Randomizer.Roll01() * 100f;
            activeAttributeSm.charAttrNumericChange[CharacterAttribute.Curse] = Randomizer.Roll01() * 100f;
            player.attributeSm.RefreshAttribute(CharacterAttribute.Luck);
            player.attributeSm.RefreshAttribute(CharacterAttribute.Curse);

            float luck = player.attributeSm[CharacterAttribute.Luck];
            float curse = player.attributeSm[CharacterAttribute.Curse];
            activeAttributeSm.chaAttrPercentageChangeOfMultiplication[CharacterAttribute.FinalDamageDealtMultiplier] = 
                MapGoodnessToDealtDamageMultiplier(Randomizer.RollLuckCurse01(luck, curse));
            activeAttributeSm.chaAttrPercentageChangeOfMultiplication[CharacterAttribute.FinalDamageReceivedMultiplier] = 
                MapGoodnessToReceivedDamageMultiplier(Randomizer.RollLuckCurse01(luck, curse));
            player.attributeSm.RefreshAttribute(CharacterAttribute.FinalDamageDealtMultiplier);
            player.attributeSm.RefreshAttribute(CharacterAttribute.FinalDamageReceivedMultiplier);
        }

        /// <summary>
        /// 强力动作开始时按随机结果映射抗性等级。
        /// 随机值越高，敌人越容易被较低等级的攻击打断。
        /// </summary>
        private Breakthrough.Type ResolveBreakthroughableType(Automata enemy, Breakthrough.Type originalType)
        {
            if (originalType is not (Breakthrough.Type.Heavy or Breakthrough.Type.Disruption or Breakthrough.Type.Forced))
            {
                return originalType;
            }

            float goodness = Randomizer.RollLuckCurse01(player.attributeSm[CharacterAttribute.Luck], player.attributeSm[CharacterAttribute.Curse]);
            if (goodness >= 2f / 3f) return Breakthrough.Type.Heavy;
            if (goodness >= 1f / 3f) return Breakthrough.Type.Disruption;
            return Breakthrough.Type.Forced;
        }

        /// <summary>
        /// 对玩家而言，较高的随机好坏值应提升造成伤害。
        /// </summary>
        private static float MapGoodnessToDealtDamageMultiplier(float goodness)
        {
            return Mathf.Lerp(MinimumDamageMultiplier, MaximumDamageMultiplier, goodness);
        }

        /// <summary>
        /// 对玩家而言，较高的随机好坏值应降低受到伤害。
        /// </summary>
        private static float MapGoodnessToReceivedDamageMultiplier(float goodness)
        {
            return Mathf.Lerp(MaximumDamageMultiplier, MinimumDamageMultiplier, goodness);
        }

        private void RegisterResistanceResolver()
        {
            if (_isResistanceResolverRegistered) return;

            SetBreakthroughResistance.onResolveBreakthroughableType.InsertByPriority(
                ResistanceResolverKey,
                new PrioritizedFunc<Automata, Breakthrough.Type, Breakthrough.Type>(ResolveBreakthroughableType));
            _isResistanceResolverRegistered = true;
        }

        private void UnregisterResistanceResolver()
        {
            if (!_isResistanceResolverRegistered) return;

            SetBreakthroughResistance.onResolveBreakthroughableType.Remove(ResistanceResolverKey);
            _isResistanceResolverRegistered = false;
        }

        private void RemoveChaosModifiers()
        {
            if (activeAttributeSm == null) return;

            // 强制卸下或 run 清理时必须还原运行时写入的四项属性。
            activeAttributeSm.charAttrNumericChange.Remove(CharacterAttribute.Luck);
            activeAttributeSm.charAttrNumericChange.Remove(CharacterAttribute.Curse);
            activeAttributeSm.chaAttrPercentageChangeOfMultiplication.Remove(CharacterAttribute.FinalDamageDealtMultiplier);
            activeAttributeSm.chaAttrPercentageChangeOfMultiplication.Remove(CharacterAttribute.FinalDamageReceivedMultiplier);

            player.attributeSm.RefreshAttribute(CharacterAttribute.Luck);
            player.attributeSm.RefreshAttribute(CharacterAttribute.Curse);
            player.attributeSm.RefreshAttribute(CharacterAttribute.FinalDamageDealtMultiplier);
            player.attributeSm.RefreshAttribute(CharacterAttribute.FinalDamageReceivedMultiplier);
        }
    }
}