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

public class TriggerManager
{
    private List<Trigger> activatedTriggers = new List<Trigger>();
    private List<DamageTrigger> damageTriggers = new List<DamageTrigger>();
    private List<StepTrigger> stepTriggers = new List<StepTrigger>();

    public TriggerManager(BattleClock clock) {
        clock.OnTimeChanged += this.NotifyTimeChanged;
    }

    private void NotifyTimeChanged(BattleTime now) {
        if (now.RoundStep == RoundStep.StartOfHeroTurn) {
            this.damageTriggers.RemoveAll(t => t.Expiration == TriggerExpiration.StartOfNextHeroTurn);
            this.stepTriggers.RemoveAll(t => t.Expiration == TriggerExpiration.StartOfNextHeroTurn);
        }

        foreach (StepTrigger st in this.stepTriggers) {
            if (st.IsTriggeredBy(now)) {
                EnqueueActivatedTrigger(st);
            }
        }
    }

    public void NotifyResolvedDamageEffect(DealDamageEffect effect) {
        foreach (DamageTrigger dt in this.damageTriggers) {
            if (dt.IsTriggeredBy(effect)) {
                EnqueueActivatedTrigger(dt);
            }
        }
    }

    public void NotifyResolvedMassDamageEffect(MassDamageEffect effect) {
        foreach (DamageTrigger dt in this.damageTriggers) {
            if (dt.IsTriggeredBy(effect)) {
                EnqueueActivatedTrigger(dt);
            }
        }
    }

    public void ArmDamageTrigger(DamageTrigger trigger) {
        this.damageTriggers.Add(trigger);
    }

    public void ArmStepTrigger(StepTrigger trigger) {
        this.stepTriggers.Add(trigger);
    }

    private void EnqueueActivatedTrigger(Trigger trigger) {
        this.activatedTriggers.Add(trigger);
    }

    public IEnumerator RunActivatedTriggers(IBattleEffectApplier effectApplier,
            MonsterViewpoint viewpoint,
            BattlePlayerControls playerControls) {
        foreach (Trigger t in this.activatedTriggers) {
           yield return t.Run(effectApplier, viewpoint, playerControls);
        }
        this.activatedTriggers.Clear();

        // Cleanup expired triggers
        this.damageTriggers.RemoveAll(t => t.Expired);
    }
}