DCGO/Assets/Scripts/CardEffectCommons/KeyWordEffects/Collision.cs

using System.Collections;
using System.Collections.Generic;
using System;
using System.Linq;
using UnityEngine;

public partial class CardEffectCommons
{
    #region Can activate [Collision]
    public static bool CanActivateCollision(CardSource cardSource)
    {
        if (IsExistOnBattleArea(cardSource))
        {
            if (cardSource.Owner.Enemy.GetBattleAreaDigimons().Count >= 1)
            {
                if (GManager.instance.attackProcess.IsAttacking)
                {
                    return true;
                }
            }
        }

        return false;
    }
    #endregion

    #region Effect process of [Collision]
    public static IEnumerator CollisionProcess(CardSource cardSource, ICardEffect activateClass, Func<IEnumerator> beforeOnAttackCoroutine = null)
    {
        if (CanActivateCollision(cardSource))
        {
            foreach (Permanent enemyDigimon in cardSource.Owner.Enemy.GetBattleAreaDigimons())
            {
                if (enemyDigimon.TopCard.CanNotBeAffected(activateClass))
                    continue;

                yield return ContinuousController.instance.StartCoroutine(GainBlocker(
                        targetPermanent: enemyDigimon,
                        effectDuration: EffectDuration.UntilEndAttack,
                        activateClass: activateClass));
            }

            int maxCount = 1;

            Permanent selectedPermanent = null;

            SelectPermanentEffect selectPermanentEffect = GManager.instance.GetComponent<SelectPermanentEffect>();

            selectPermanentEffect.SetUp(
                selectPlayer: cardSource.Owner.Enemy,
                canTargetCondition: CanSelectBlockerCondition,
                canTargetCondition_ByPreSelecetedList: null,
                canEndSelectCondition: null,
                maxCount: maxCount,
                canNoSelect: false,
                canEndNotMax: false,
                selectPermanentCoroutine: SelectPermanentCoroutine,
                afterSelectPermanentCoroutine: null,
                mode: SelectPermanentEffect.Mode.Custom,
                cardEffect: null);

            selectPermanentEffect.SetUpCustomMessage("Select 1 Digimon that will block.", "The opponent is selecting 1 Digimon that will block.");

            yield return ContinuousController.instance.StartCoroutine(selectPermanentEffect.Activate());

            bool CanSelectBlockerCondition(Permanent permanent)
            {
                if (CardEffectCommons.IsPermanentExistsOnBattleArea(permanent))
                {
                    if (permanent.TopCard.Owner.isYou)
                    {
                        if (permanent.HasBlocker && permanent.CanBlock(cardSource.PermanentOfThisCard()))
                        {
                            return true;
                        }
                    }
                }

                return false;
            }

            IEnumerator SelectPermanentCoroutine(Permanent permanent)
            {
                selectedPermanent = permanent;

                yield return ContinuousController.instance.StartCoroutine(GManager.instance.attackProcess.SwitchDefender(null, true, selectedPermanent));
            }
        }
    }
    #endregion
}