using UnityEngine;

namespace TKS
{
    /// <summary>전장의 유닛 1기. 능력치·상태·콜라이더를 가진다. 시각은 UnitView 가 담당.</summary>
    [RequireComponent(typeof(CircleCollider2D))]
    public class Unit : MonoBehaviour
    {
        public string DisplayName;
        public UnitType Type;
        public Faction Faction;
        public bool IsBoss;

        public int MaxHp;
        public int Hp;
        public int Atk;
        public int Def;
        public float Radius;
        public float SlingMaxDistance;
        public float AttackRange;

        /// <summary>이번 아군 턴에 행동을 마쳤는가.</summary>
        public bool ActedThisTurn;
        /// <summary>보병이 최종 목표점 명중으로 얻은 추가 이동(이동만 가능).</summary>
        public bool BonusMoveAvailable;
        /// <summary>창병 대기(견제) 상태 — 적군 턴에 반경 안에서 움직이는 적에게 피해.</summary>
        public bool Overwatch;

        public CircleCollider2D Collider { get; private set; }
        public UnitView View { get; private set; }

        public bool IsAlive
        {
            get { return Hp > 0; }
        }

        public Vector2 Position
        {
            get { return transform.position; }
            set { transform.position = new Vector3(value.x, value.y, 0f); }
        }

        public void Init(BalanceConfig cfg, UnitType type, Faction faction, string displayName, float hpMult, float atkMult, bool boss)
        {
            var s = cfg.GetStats(type);
            Type = type;
            Faction = faction;
            DisplayName = displayName;
            IsBoss = boss;
            MaxHp = Mathf.Max(1, Mathf.RoundToInt(s.maxHp * hpMult * (boss ? cfg.bossHpMult : 1f)));
            Hp = MaxHp;
            Atk = Mathf.Max(1, Mathf.RoundToInt(s.atk * atkMult));
            Def = s.def;
            Radius = s.radius * (boss ? cfg.bossRadiusMult : 1f);
            SlingMaxDistance = s.slingMaxDistance;
            AttackRange = s.attackRange;
            gameObject.name = (faction == Faction.Player ? "P_" : "E_") + displayName;

            Collider = GetComponent<CircleCollider2D>();
            Collider.radius = Radius;
            Collider.isTrigger = false;
            Collider.enabled = true;

            View = GetComponentInChildren<UnitView>();
            if (View == null)
            {
                var vgo = new GameObject("View");
                vgo.transform.SetParent(transform, false);
                View = vgo.AddComponent<UnitView>();
            }
            View.Build(this);
        }

        public void TakeDamage(int dmg)
        {
            if (!IsAlive) return;
            Hp = Mathf.Max(0, Hp - dmg);
            if (View != null)
            {
                View.OnHit();
                View.Refresh();
            }
            if (!IsAlive) Die();
        }

        void Die()
        {
            Overwatch = false;
            BonusMoveAvailable = false;
            Collider.enabled = false;
            if (View != null) View.PlayDeath();
        }

        public void SetOverwatch(bool on)
        {
            Overwatch = on && IsAlive;
            if (View != null) View.Refresh();
        }

        public void ResetForNewTurn()
        {
            ActedThisTurn = false;
            BonusMoveAvailable = false;
            Overwatch = false;
            if (View != null) View.Refresh();
        }

        public void MarkActed()
        {
            ActedThisTurn = true;
            BonusMoveAvailable = false;
            if (View != null) View.Refresh();
        }

        public void GrantBonusMove()
        {
            ActedThisTurn = false;
            BonusMoveAvailable = true;
            if (View != null) View.Refresh();
        }
    }
}