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

public class BattleParticipant
{
    public delegate void BattleParticipantUpdateAction(BattleParticipant participant);
    public event BattleParticipantUpdateAction OnHit;
    public event BattleParticipantUpdateAction OnDeath;
    public event BattleParticipantUpdateAction OnStatusChanged;
    public event BattleParticipantUpdateAction OnBuffsChanged;

    protected TeamChoice team;
    protected string displayName;
    protected int hp;
    protected int maxHP;
    protected int block;
    protected bool dead;
    protected Dictionary<BattleStatus, int> statuses;

    public BattleParticipant(TeamChoice team) {
        this.team = team;
        this.statuses = new Dictionary<BattleStatus, int>();
    }

    public void Init() {
        this.hp = this.maxHP;
    }

    public string GetDisplayName() {
        return this.displayName;
    }

    public int GetHP() {
        return this.hp;
    }

    public int GetMaxHP() {
        return this.maxHP;
    }

    public bool IsAlive() {
        return !this.dead;
    }

    public int DealDamage(int damage) {
        if (!IsAlive()) {
            return 0;
        }

        int blockedDamage = Math.Min(damage, this.block);
        if (blockedDamage > 0) {
            this.block -= blockedDamage;
            damage -= blockedDamage;
        }
        damage = Math.Min(this.hp, damage);
        this.hp -= damage;
        TriggerOnHit();
        return damage;
    }

    public void CheckState() {
        if (!IsAlive()) {
            return;
        }
        
        if (this.hp <= 0) {
            this.dead = true;
            WipeStatus();
            TriggerOnDeath();
        }
    }

    public int Heal(int amount) {
        if (!IsAlive()) {
            return 0;
        }

        amount = Math.Min(this.maxHP - this.hp, amount);
        this.hp += amount;
        return amount;
    }

    public void AddBlock(int block) {
        if (!IsAlive()) {
            return;
        }
        
        this.block += block;
    }

    public void ResetBlock() {
        if (!IsAlive()) {
            return;
        }
        
        this.block = 0;
    }

    public int GetBlock() {
        return this.block;
    }

    public TeamChoice Team {
        get => this.team;
    }

    public void IncreaseMaxHP(int amount) {
        if (!IsAlive()) {
            return;
        }
        
        this.maxHP += amount;
        if (this.hp > 0) {
            this.hp += amount;
        }
    }

    private void TriggerOnHit() {
        if (this.OnHit != null) {
            this.OnHit(this);
        }
    }

    private void TriggerOnDeath() {
        if (this.OnDeath != null) {
            this.OnDeath(this);
        }
    }

    public int AddStatus(BattleStatus status, int amount) {
        if (amount <= 0) {
            return 0;
        }
        
        int currentAmount;
        this.statuses.TryGetValue(status, out currentAmount);
        this.statuses[status] = currentAmount + amount;
        TriggerOnStatusChanged();
        return amount;
    }

    public void TickStatuses() {
        if (this.statuses.Count > 0) {
            Dictionary<BattleStatus, int> newStatuses = new Dictionary<BattleStatus, int>();
            foreach (KeyValuePair<BattleStatus, int> pair in this.statuses) {
                if (pair.Value > 1) {
                    newStatuses[pair.Key] = pair.Value - 1;
                }
            }
            this.statuses = newStatuses;
            TriggerOnStatusChanged();
        }
    }

    public void WipeStatus() {
        if (this.statuses.Count > 0) {
            this.statuses = new Dictionary<BattleStatus, int>();
            TriggerOnStatusChanged();
        }
    }

    public bool CanUseCard(BaseCard card) {
        return IsAlive() && !HasStatus(BattleStatus.Stun);
    }

    public bool CanUseDefault() {
        return IsAlive() && !HasStatus(BattleStatus.Stun);
    }

    public bool HasStatus(BattleStatus status) {
        return this.statuses.ContainsKey(status);
    }

    public int GetStatusAmount(BattleStatus status) {
        if (!this.statuses.ContainsKey(status)) {
            return 0;
        } else {
            return this.statuses[status];
        }
    }

    private void TriggerOnStatusChanged() {
        if (this.OnStatusChanged != null) {
            this.OnStatusChanged(this);
        }
    }

    public void TriggerOnBuffsChanged() {
        if (this.OnBuffsChanged != null) {
            this.OnBuffsChanged(this);
        }
    }
}