using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using TcgEngine.Gameplay;

namespace TcgEngine
{
    /// <summary>
    /// 定义所有能力数据
    /// </summary>

    [CreateAssetMenu(fileName = "ability", menuName = "TcgEngine/AbilityData", order = 5)]
    public class AbilityData : ScriptableObject
    {
        public string id;

        [Header("Trigger")]
        public AbilityTrigger trigger;             //WHEN does the ability trigger?
        public ConditionData[] conditions_trigger; //Condition checked on the card triggering the ability (usually the caster)

        [Header("Target")]
        public AbilityTarget target;               //WHO is targeted?
        public ConditionData[] conditions_target;  //Condition checked on the target to know if its a valid taget
        public FilterData[] filters_target;  //Condition checked on the target to know if its a valid taget

        [Header("Effect")]
        public EffectData[] effects;              //WHAT this does?
        public StatusData[] status;               //Status added by this ability  
        public int value;                         //Value passed to the effect (deal X damage)
        public int duration;                      //Duration passed to the effect (usually for status, 0=permanent)

        [Header("Chain/Choices")]
        public AbilityData[] chain_abilities;    //Abilities that will be triggered after this one

        [Header("Activated Ability")]
        public int mana_cost;                   //Mana cost for  activated abilities
        public bool exhaust;                    //Action cost for activated abilities

        [Header("FX")]
        public GameObject board_fx;
        public GameObject caster_fx;
        public GameObject target_fx;
        public GameObject projectile_fx;
        public AudioClip cast_audio;
        public AudioClip target_audio;
        public bool charge_target;

        [Header("Text")]
        public string title;
        [TextArea(5, 7)]
        public string desc;

        public static List<AbilityData> ability_list = new List<AbilityData>();                             //Faster access in loops
        public static Dictionary<string, AbilityData> ability_dict = new Dictionary<string, AbilityData>(); //Faster access in Get(id)

        public static void Load(string folder = "")
        {
            if (ability_list.Count == 0)
            {
                ability_list.AddRange(Resources.LoadAll<AbilityData>(folder));

                foreach (AbilityData ability in ability_list)
                    ability_dict.Add(ability.id, ability);
            }
        }

        public string GetTitle()
        {
            return title;
        }

        public string GetDesc()
        {
            return desc;
        }

        public string GetDesc(CardData card)
        {
            string dsc = desc;
            dsc = dsc.Replace("<name>", card.title);
            dsc = dsc.Replace("<value>", value.ToString());
            dsc = dsc.Replace("<duration>", duration.ToString());
            return dsc;
        }

        //Generic condition for the ability to trigger
        public bool AreTriggerConditionsMet(Game data, Card caster)
        {
            return AreTriggerConditionsMet(data, caster, caster); //Triggerer is the caster
        }

        //Some abilities are caused by another card (PlayOther), otherwise most of the time the triggerer is the caster, check condition on triggerer
        public bool AreTriggerConditionsMet(Game data, Card caster, Card trigger_card)
        {
            foreach (ConditionData cond in conditions_trigger)
            {
                if (cond != null)
                {
                    if (!cond.IsTriggerConditionMet(data, this, caster))
                        return false;
                    if (!cond.IsTargetConditionMet(data, this, caster, trigger_card))
                        return false;
                }
            }
            return true;
        }

        //Some abilities are caused by an action on a player (OnFight when attacking the player), check condition on that player
        public bool AreTriggerConditionsMet(Game data, Card caster, Player trigger_player)
        {
            foreach (ConditionData cond in conditions_trigger)
            {
                if (cond != null)
                {
                    if (!cond.IsTriggerConditionMet(data, this, caster))
                        return false;
                    if (!cond.IsTargetConditionMet(data, this, caster, trigger_player))
                        return false;
                }
            }
            return true;
        }

        //Check if the card target is valid
        public bool AreTargetConditionsMet(Game data, Card caster, Card target_card)
        {
            foreach (ConditionData cond in conditions_target)
            {
                if (cond != null && !cond.IsTargetConditionMet(data, this, caster, target_card))
                    return false;
            }
            return true;
        }

        //Check if the player target is valid
        public bool AreTargetConditionsMet(Game data, Card caster, Player target_player)
        {
            foreach (ConditionData cond in conditions_target)
            {
                if (cond != null && !cond.IsTargetConditionMet(data, this, caster, target_player))
                    return false;
            }
            return true;
        }

        //Check if the slot target is valid
        public bool AreTargetConditionsMet(Game data, Card caster, Slot target_slot)
        {
            foreach (ConditionData cond in conditions_target)
            {
                if (cond != null && !cond.IsTargetConditionMet(data, this, caster, target_slot))
                    return false;
            }
            return true;
        }

        //Check if the card data target is valid
        public bool AreTargetConditionsMet(Game data, Card caster, CardData target_card)
        {
            foreach (ConditionData cond in conditions_target)
            {
                if (cond != null && !cond.IsTargetConditionMet(data, this, caster, target_card))
                    return false;
            }
            return true;
        }

        //CanTarget is similar to AreTargetConditionsMet but only applies to targets on the board, with extra board-only conditions
        public bool CanTarget(Game data, Card caster, Card target)
        {
            if (target.HasStatus(StatusType.Stealth))
                return false; //Hidden

            if (target.HasStatus(StatusType.SpellImmunity))
                return false; //Spell immunity

            bool condition_match = AreTargetConditionsMet(data, caster, target);
            return condition_match;
        }

        //Can target check additional restrictions and is usually for SelectTarget or PlayTarget abilities
        public bool CanTarget(Game data, Card caster, Player target)
        {
            bool condition_match = AreTargetConditionsMet(data, caster, target);
            return condition_match;
        }

        public bool CanTarget(Game data, Card caster, Slot target)
        {
            return AreTargetConditionsMet(data, caster, target); //No additional conditions for slots
        }

        //Check if destination array has the target after being filtered, used to support filters in CardSelector
        public bool IsCardSelectionValid(Game data, Card caster, Card target, ListSwap<Card> card_array = null)
        {
            List<Card> targets = GetCardTargets(data, caster, card_array);
            return targets.Contains(target); //Card is still in array after filtering
        }

        public void DoEffects(GameLogic logic, Card caster)
        {
            foreach(EffectData effect in effects)
                effect?.DoEffect(logic, this, caster);
        }

        public void DoEffects(GameLogic logic, Card caster, Card target)
        {
            foreach (EffectData effect in effects)
                effect?.DoEffect(logic, this, caster, target);
            foreach(StatusData stat in status)
                target.AddStatus(stat, value, duration);
        }

        public void DoEffects(GameLogic logic, Card caster, Player target)
        {
            foreach (EffectData effect in effects)
                effect?.DoEffect(logic, this, caster, target);
            foreach (StatusData stat in status)
                target.AddStatus(stat, value, duration);
        }

        public void DoEffects(GameLogic logic, Card caster, Slot target)
        {
            foreach (EffectData effect in effects)
                effect?.DoEffect(logic, this, caster, target);
        }

        public void DoEffects(GameLogic logic, Card caster, CardData target)
        {
            foreach (EffectData effect in effects)
                effect?.DoEffect(logic, this, caster, target);
        }

        public void DoOngoingEffects(GameLogic logic, Card caster, Card target)
        {
            foreach (EffectData effect in effects)
                effect?.DoOngoingEffect(logic, this, caster, target);
            foreach (StatusData stat in status)
                target.AddOngoingStatus(stat, value);
        }

        public void DoOngoingEffects(GameLogic logic, Card caster, Player target)
        {
            foreach (EffectData effect in effects)
                effect?.DoOngoingEffect(logic, this, caster, target);
            foreach (StatusData stat in status)
                target.AddOngoingStatus(stat, value);
        }

        public bool HasEffect<T>() where T : EffectData
        {
            foreach (EffectData eff in effects)
            {
                if (eff != null && eff is T)
                    return true;
            }
            return false;
        }

        public bool HasStatus(StatusType type)
        {
            foreach (StatusData sta in status)
            {
                if (sta != null && sta.effect == type)
                    return true;
            }
            return false;
        }

        public int GetDamage()
        {
            int damage = 0;
            foreach (EffectData eff in effects)
            {
                if (eff != null && eff is EffectDamage)
                {
                    damage += this.value;
                }
            }
            return damage;
        }

        private void AddValidCards(Game data, Card caster, List<Card> source, List<Card> targets)
        {
            foreach (Card card in source)
            {
                if (AreTargetConditionsMet(data, caster, card))
                    targets.Add(card);
            }
        }

        //Return cards targets,  memory_array is used for optimization and avoid allocating new memory
        public List<Card> GetCardTargets(Game data, Card caster, ListSwap<Card> memory_array = null)
        {
            if (memory_array == null)
                memory_array = new ListSwap<Card>(); //Slow operation

            List<Card> targets = memory_array.Get();

            if (target == AbilityTarget.Self)
            {
                if (AreTargetConditionsMet(data, caster, caster))
                    targets.Add(caster);
            }

            if (target == AbilityTarget.AllCardsBoard || target == AbilityTarget.SelectTarget)
            {
                foreach (Player player in data.players)
                {
                    foreach (Card card in player.cards_board)
                    {
                        if (AreTargetConditionsMet(data, caster, card))
                            targets.Add(card);
                    }
                }
            }

            if (target == AbilityTarget.AllCardsHand)
            {
                foreach (Player player in data.players)
                {
                    foreach (Card card in player.cards_hand)
                    {
                        if (AreTargetConditionsMet(data, caster, card))
                            targets.Add(card);
                    }
                }
            }

            if (target == AbilityTarget.AllCardsAllPiles || target == AbilityTarget.CardSelector)
            {
                foreach (Player player in data.players)
                {
                    AddValidCards(data, caster, player.cards_deck, targets);
                    AddValidCards(data, caster, player.cards_discard, targets);
                    AddValidCards(data, caster, player.cards_hand, targets);
                    AddValidCards(data, caster, player.cards_secret, targets);
                    AddValidCards(data, caster, player.cards_board, targets);
                    AddValidCards(data, caster, player.cards_equip, targets);
                    AddValidCards(data, caster, player.cards_temp, targets);
                }
            }

            if (target == AbilityTarget.LastPlayed)
            {
                Card target = data.GetCard(data.last_played);
                if (target != null && AreTargetConditionsMet(data, caster, target))
                    targets.Add(target);
            }

            if (target == AbilityTarget.LastDestroyed)
            {
                Card target = data.GetCard(data.last_destroyed);
                if (target != null && AreTargetConditionsMet(data, caster, target))
                    targets.Add(target);
            }

            if (target == AbilityTarget.LastTargeted)
            {
                Card target = data.GetCard(data.last_target);
                if (target != null && AreTargetConditionsMet(data, caster, target))
                    targets.Add(target);
            }

            if (target == AbilityTarget.LastTargetedLeft)
            {
                Card lastTarget = data.GetCard(data.last_target);
                if (lastTarget != null && lastTarget.slot.x > Slot.x_min)
                {
                    Slot leftSlot = new Slot(lastTarget.slot.x - 1, lastTarget.slot.y, lastTarget.slot.p);
                    Card leftCard = data.GetSlotCard(leftSlot);
                    if (leftCard != null && AreTargetConditionsMet(data, caster, leftCard))
                        targets.Add(leftCard);
                }
            }

            if (target == AbilityTarget.LastTargetedRight)
            {
                Card lastTarget = data.GetCard(data.last_target);
                if (lastTarget != null && lastTarget.slot.x < Slot.x_max)
                {
                    Slot rightSlot = new Slot(lastTarget.slot.x + 1, lastTarget.slot.y, lastTarget.slot.p);
                    Card rightCard = data.GetSlotCard(rightSlot);
                    if (rightCard != null && AreTargetConditionsMet(data, caster, rightCard))
                        targets.Add(rightCard);
                }
            }

            if (target == AbilityTarget.LastSummoned)
            {
                Card target = data.GetCard(data.last_summoned);
                if (target != null && AreTargetConditionsMet(data, caster, target))
                    targets.Add(target);
            }

            if (target == AbilityTarget.AbilityTriggerer)
            {
                Card target = data.GetCard(data.ability_triggerer);
                if (target != null && AreTargetConditionsMet(data, caster, target))
                    targets.Add(target);
            }

            if (target == AbilityTarget.EquippedCard)
            {
                if (caster.CardData.IsEquipment())
                {
                    //Get bearer of the equipment
                    Player player = data.GetPlayer(caster.player_id);
                    Card target = player.GetBearerCard(caster);
                    if (target != null && AreTargetConditionsMet(data, caster, target))
                        targets.Add(target);
                }
                else if(caster.equipped_uid != null)
                {
                    //Get equipped card
                    Card target = data.GetCard(caster.equipped_uid);
                    if (target != null && AreTargetConditionsMet(data, caster, target))
                        targets.Add(target);
                }
            }

            //Filter targets
            if (filters_target != null && targets.Count > 0)
            {
                foreach (FilterData filter in filters_target)
                {
                    if (filter != null)
                        targets = filter.FilterTargets(data, this, caster, targets, memory_array.GetOther(targets));
                }
            }

            return targets;
        }

        //Return player targets,  memory_array is used for optimization and avoid allocating new memory
        public List<Player> GetPlayerTargets(Game data, Card caster, ListSwap<Player> memory_array = null)
        {
            if (memory_array == null)
                memory_array = new ListSwap<Player>(); //Slow operation

            List<Player> targets = memory_array.Get();

            if (target == AbilityTarget.PlayerSelf)
            {
                Player player = data.GetPlayer(caster.player_id);
                targets.Add(player);
            }
            else if (target == AbilityTarget.PlayerOpponent)
            {
                for (int tp = 0; tp < data.players.Length; tp++)
                {
                    if (tp != caster.player_id)
                    {
                        Player oplayer = data.players[tp];
                        targets.Add(oplayer);
                    }
                }
            }
            else if (target == AbilityTarget.AllPlayers)
            {
                foreach (Player player in data.players)
                {
                    if (AreTargetConditionsMet(data, caster, player))
                        targets.Add(player);
                }
                
            }

            //Filter targets
            if (filters_target != null && targets.Count > 0)
            {
                foreach (FilterData filter in filters_target)
                {
                    if (filter != null)
                        targets = filter.FilterTargets(data, this, caster, targets, memory_array.GetOther(targets));
                }
            }

            return targets;
        }

        //Return slot targets,  memory_array is used for optimization and avoid allocating new memory
        public List<Slot> GetSlotTargets(Game data, Card caster, ListSwap<Slot> memory_array = null)
        {
            if (memory_array == null)
                memory_array = new ListSwap<Slot>(); //Slow operation

            List<Slot> targets = memory_array.Get();

            if (target == AbilityTarget.AllSlots)
            {
                List<Slot> slots = Slot.GetAll();
                foreach (Slot slot in slots)
                {
                    if (AreTargetConditionsMet(data, caster, slot))
                        targets.Add(slot);
                }
            }

            //Filter targets
            if (filters_target != null && targets.Count > 0)
            {
                foreach (FilterData filter in filters_target)
                {
                    if (filter != null)
                        targets = filter.FilterTargets(data, this, caster, targets, memory_array.GetOther(targets));
                }
            }

            return targets;
        }

        public List<CardData> GetCardDataTargets(Game data, Card caster, ListSwap<CardData> memory_array = null)
        {
            if (memory_array == null)
                memory_array = new ListSwap<CardData>(); //Slow operation

            List<CardData> targets = memory_array.Get();

            if (target == AbilityTarget.AllCardData)
            {
                foreach (CardData card in CardData.GetAll())
                {
                    if (AreTargetConditionsMet(data, caster, card))
                        targets.Add(card);
                }
            }

            //Filter targets
            if (filters_target != null && targets.Count > 0)
            {
                foreach (FilterData filter in filters_target)
                {
                    if (filter != null)
                        targets = filter.FilterTargets(data, this, caster, targets, memory_array.GetOther(targets));
                }
            }

            return targets;
        }

        // Check if there is any valid target, if not, AI wont try to cast activated ability
        public bool HasValidSelectTarget(Game game_data, Card caster)
        {
            if (target == AbilityTarget.SelectTarget)
            {
                if (HasValidBoardCardTarget(game_data, caster))
                    return true;
                if (HasValidPlayerTarget(game_data, caster))
                    return true;
                if (HasValidSlotTarget(game_data, caster))
                    return true;
                return false;
            }

            if (target == AbilityTarget.CardSelector)
            {
                if (HasValidCardTarget(game_data, caster))
                    return true;
                return false;
            }

            if (target == AbilityTarget.ChoiceSelector)
            {
                foreach (AbilityData choice in chain_abilities)
                {
                    if(choice.AreTriggerConditionsMet(game_data, caster))
                        return true;
                }
                return false;
            }

            return true; //Not selecting, valid
        }

        public bool HasValidBoardCardTarget(Game game_data, Card caster)
        {
            for (int p = 0; p < game_data.players.Length; p++)
            {
                Player player = game_data.players[p];
                for (int c = 0; c < player.cards_board.Count; c++)
                {
                    Card card = player.cards_board[c];
                    if (CanTarget(game_data, caster, card))
                        return true;
                }
            }
            return false;
        }

        public bool HasValidCardTarget(Game game_data, Card caster)
        {
            for (int p = 0; p < game_data.players.Length; p++)
            {
                Player player = game_data.players[p];
                bool v1 = HasValidCardTarget(game_data, caster, player.cards_deck);
                bool v2 = HasValidCardTarget(game_data, caster, player.cards_discard);
                bool v3 = HasValidCardTarget(game_data, caster, player.cards_hand);
                bool v4 = HasValidCardTarget(game_data, caster, player.cards_board);
                bool v5 = HasValidCardTarget(game_data, caster, player.cards_equip);
                bool v6 = HasValidCardTarget(game_data, caster, player.cards_secret);
                bool v7 = HasValidCardTarget(game_data, caster, player.cards_temp);
                if (v1 || v2 || v3 || v4 || v5 || v6 || v7)
                    return true;
            }
            return false;
        }

        public bool HasValidCardTarget(Game game_data, Card caster, List<Card> list)
        {
            for (int c = 0; c < list.Count; c++)
            {
                Card card = list[c];
                if (AreTargetConditionsMet(game_data, caster, card))
                    return true;
            }
            return false;
        }

        public bool HasValidPlayerTarget(Game game_data, Card caster)
        {
            for (int p = 0; p < game_data.players.Length; p++)
            {
                Player player = game_data.players[p];
                if (CanTarget(game_data, caster, player))
                    return true;
            }
            return false;
        }

        public bool HasValidSlotTarget(Game game_data, Card caster)
        {
            foreach (Slot slot in Slot.GetAll())
            {
                if (CanTarget(game_data, caster, slot))
                    return true;
            }
            return false;
        }

        public bool IsSelector()
        {
            return target == AbilityTarget.SelectTarget || target == AbilityTarget.CardSelector || target == AbilityTarget.ChoiceSelector;
        }

        public static AbilityData Get(string id)
        {
            if (id == null)
                return null;
            bool success = ability_dict.TryGetValue(id, out AbilityData ability);
            if (success)
                return ability;
            return null;
        }

        public static List<AbilityData> GetAll()
        {
            return ability_list;
        }
    }


    public enum AbilityTrigger
    {
        None = 0,

        Ongoing = 2,  //Always active (does not work with all effects)
        Activate = 5, //Action

        OnPlay = 10,  //When playeds
        OnPlayOther = 12,  //When another card played

        StartOfTurn = 20, //Every turn
        EndOfTurn = 22, //Every turn

        OnBeforeAttack = 30, //When attacking, before damage
        OnAfterAttack = 31, //When attacking, after damage if still alive
        OnBeforeDefend = 32, //When being attacked, before damage
        OnAfterDefend = 33, //When being attacked, after damage if still alive
        OnKill = 35,        //When killing another card during an attack

        OnDeath = 40, //When dying
        OnDeathOther = 42, //When another dying
    }

    public enum AbilityTarget
    {
        None = 0,
        Self = 1,

        PlayerSelf = 4,
        PlayerOpponent = 5,
        AllPlayers = 7,

        AllCardsBoard = 10,
        AllCardsHand = 11,
        AllCardsAllPiles = 12,
        AllSlots = 15,
        AllCardData = 17,       //For card Create effects only

        PlayTarget = 20,        //The target selected at the same time the spell was played (spell only)      
        AbilityTriggerer = 25,   //The card that triggered the trap
        EquippedCard = 27,       //If equipment, the bearer, if character, the item equipped

        SelectTarget = 30,        //Select a card, player or slot on board
        CardSelector = 40,          //Card selector menu
        ChoiceSelector = 50,        //Choice selector menu

        LastPlayed = 70,            //Last card that was played 
        LastTargeted = 72,          //Last card that was targeted with an ability
        LastTargetedLeft = 73,     //Last card that was targeted with an ability and is on the left side of the board
        LastTargetedRight = 74,    //Last card that was targeted with an ability and is on the right side of the board
        LastDestroyed = 75,            //Last card that was killed
        LastSummoned = 77,            //Last card that was summoned or created

    }

}