using System.Collections;
using UnityEngine;

namespace TKS
{
    /// <summary>
    /// 유닛 표시. 아트(Resources/Units/&lt;art&gt;/ 프레임 애니 · UnitArt)가 있으면 스프라이트(아군 = 뒷모습 back_* · 적군 = 앞모습 front_*),
    /// 없으면 도형(몸통 원 + 병종 글자). 공통 = 이름 · HP 바 · 선택/표적 링 · 보스 테두리 · 창병 대기 반경.
    /// </summary>
    public class UnitView : MonoBehaviour
    {
        public static readonly Color PlayerColor = new Color(0.25f, 0.55f, 0.95f);
        public static readonly Color EnemyColor = new Color(0.9f, 0.32f, 0.3f);
        static readonly Color DimColor = new Color(0.3f, 0.3f, 0.32f);
        static readonly Color ArtDimColor = new Color(0.45f, 0.45f, 0.5f);
        static readonly Color ArtHitTint = new Color(1f, 0.45f, 0.45f);
        const float HpBarWidth = 1.0f;
        const float AttackHold = 0.35f;
        const float HitHold = 0.3f;

        Unit unit;
        SpriteRenderer body;
        FrameAnimator anim;
        SpriteRenderer bossRing;
        SpriteRenderer selectRing;
        SpriteRenderer highlightRing;
        SpriteRenderer overwatchArea;
        SpriteRenderer hpBg;
        SpriteRenderer hpFill;
        TextMesh mark;
        TextMesh nameLabel;
        TextMesh badge;
        Color baseColor;
        Coroutine flash;
        bool aiming;

        /// <summary>스프라이트 아트로 그리는가(false = 도형).</summary>
        public bool HasArt
        {
            get { return anim != null; }
        }

        public FrameAnimator Anim
        {
            get { return anim; }
        }

        public void Build(Unit u)
        {
            unit = u;
            foreach (Transform c in transform) Destroy(c.gameObject);
            baseColor = u.Faction == Faction.Player ? PlayerColor : EnemyColor;
            float d = u.Radius * 2f;

            // 창병 대기 반경 표시(창병만 · 발동 중에만 오브젝트 통째로 켬)
            overwatchArea = ProceduralSprites.NewSprite(transform, "OverwatchArea", ProceduralSprites.Circle, new Color(0.3f, 0.65f, 1f, 0.16f), u.Type == UnitType.Spear ? u.AttackRange * 2f : 0f, -6);
            var owRing = ProceduralSprites.NewSprite(overwatchArea.transform, "Ring", ProceduralSprites.Ring, new Color(0.5f, 0.8f, 1f, 0.6f), 1f, -5);
            owRing.transform.localScale = Vector3.one;
            overwatchArea.gameObject.SetActive(false);

            if (u.IsBoss)
            {
                bossRing = ProceduralSprites.NewSprite(transform, "BossRing", ProceduralSprites.Circle, new Color(1f, 0.85f, 0.3f), d + 0.16f, -1);
            }

            body = ProceduralSprites.NewSprite(transform, "Body", ProceduralSprites.Circle, baseColor, d, 0);

            // 아트가 있으면 몸통 원 대신 스프라이트 애니(발 = 원 아래쪽)
            anim = null;
            var art = UnitArt.Load(u.ArtId);
            if (art != null)
            {
                body.enabled = false;
                var ago = new GameObject("Art");
                ago.transform.SetParent(transform, false);
                ago.transform.localPosition = new Vector3(0f, -u.Radius * 0.55f, 0f);
                anim = ago.AddComponent<FrameAnimator>();
                anim.Setup(art, u.ArtHeight, 0);
                anim.SetIdle(ClipName("idle"));
                anim.PlayIdle();
            }

            selectRing = ProceduralSprites.NewSprite(transform, "SelectRing", ProceduralSprites.Ring, new Color(1f, 0.95f, 0.4f), d + 0.28f, 1);
            selectRing.enabled = false;
            highlightRing = ProceduralSprites.NewSprite(transform, "HighlightRing", ProceduralSprites.Ring, new Color(1f, 0.5f, 0.15f), d + 0.28f, 1);
            highlightRing.enabled = false;

            hpBg = ProceduralSprites.NewSprite(transform, "HpBg", ProceduralSprites.Square, new Color(0.08f, 0.08f, 0.08f, 0.9f), 1f, 2);
            hpBg.transform.localPosition = new Vector3(0f, u.Radius + 0.22f, 0f);
            hpBg.transform.localScale = new Vector3(HpBarWidth, 0.12f, 1f);
            hpFill = ProceduralSprites.NewSprite(transform, "HpFill", ProceduralSprites.Square, new Color(0.35f, 0.9f, 0.35f), 1f, 3);
            hpFill.transform.localPosition = hpBg.transform.localPosition;
            hpFill.transform.localScale = new Vector3(HpBarWidth, 0.12f, 1f);

            mark = TextUtil.CreateWorldText(transform, UnitTypeInfo.Mark(u.Type), u.Radius * 1.1f, Color.white, 4);
            if (anim != null) mark.gameObject.SetActive(false); // 아트가 있으면 병종은 이름 옆에
            nameLabel = TextUtil.CreateWorldText(transform, anim != null ? u.DisplayName + "·" + UnitTypeInfo.Mark(u.Type) : u.DisplayName, 0.26f, new Color(0.95f, 0.95f, 0.9f), 4);
            nameLabel.transform.localPosition = new Vector3(0f, -u.Radius - 0.22f, 0f);
            badge = TextUtil.CreateWorldText(transform, "추가 이동", 0.22f, new Color(1f, 0.95f, 0.4f), 5);
            badge.transform.localPosition = new Vector3(0f, u.Radius + 0.46f, 0f);
            badge.gameObject.SetActive(false);

            Refresh();
        }

        /// <summary>보기(아군 = back · 적군 = front)에 맞는 클립 이름. 그 보기에 없으면 다른 보기 → 대기.</summary>
        string ClipName(string suffix)
        {
            string v = unit.Faction == Faction.Player ? "back" : "front";
            string o = unit.Faction == Faction.Player ? "front" : "back";
            if (anim.Has(v + "_" + suffix)) return v + "_" + suffix;
            if (anim.Has(o + "_" + suffix)) return o + "_" + suffix;
            return anim.Has(v + "_idle") ? v + "_idle" : o + "_idle";
        }

        public void Refresh()
        {
            if (unit == null || hpFill == null) return;
            float ratio = unit.MaxHp > 0 ? Mathf.Clamp01((float)unit.Hp / unit.MaxHp) : 0f;
            hpFill.transform.localScale = new Vector3(HpBarWidth * ratio, 0.12f, 1f);
            hpFill.transform.localPosition = new Vector3(-HpBarWidth * 0.5f + HpBarWidth * ratio * 0.5f, hpBg.transform.localPosition.y, 0f);
            hpFill.color = ratio > 0.5f ? new Color(0.35f, 0.9f, 0.35f) : (ratio > 0.25f ? new Color(0.95f, 0.8f, 0.2f) : new Color(0.95f, 0.3f, 0.2f));

            bool dim = unit.Faction == Faction.Player && unit.ActedThisTurn;
            if (flash == null)
            {
                if (anim != null) anim.Renderer.color = dim ? Color.Lerp(Color.white, ArtDimColor, 0.6f) : Color.white;
                else body.color = dim ? Color.Lerp(baseColor, DimColor, 0.6f) : baseColor;
            }
            mark.color = dim ? new Color(1f, 1f, 1f, 0.6f) : Color.white;

            bool ow = unit.Overwatch && unit.Type == UnitType.Spear && unit.IsAlive;
            if (overwatchArea.gameObject.activeSelf != ow) overwatchArea.gameObject.SetActive(ow);
            badge.gameObject.SetActive(unit.BonusMoveAvailable && unit.IsAlive);
        }

        public void SetSelected(bool on)
        {
            if (selectRing != null) selectRing.enabled = on;
        }

        public void SetHighlight(bool on)
        {
            if (highlightRing != null) highlightRing.enabled = on;
        }

        /// <summary>조준(당기는) 중 = 준비 자세 · 끝나면 대기.</summary>
        public void SetAiming(bool on)
        {
            if (anim == null || aiming == on) return;
            aiming = on;
            if (on) anim.Play(ClipName("ready"), true);
            else anim.PlayIdle();
        }

        /// <summary>공격 자세(1 프레임) 잠깐 → 대기.</summary>
        public void PlayAttack()
        {
            if (anim == null || !isActiveAndEnabled) return;
            aiming = false;
            anim.Play(ClipName("action"), false, AttackHold, true);
        }

        /// <summary>승리 동작(앞모습 · 끝 프레임 유지).</summary>
        public void PlayVictory()
        {
            if (anim == null || !isActiveAndEnabled || !unit.IsAlive) return;
            aiming = false;
            anim.Play(ClipName("victory"), false);
        }

        public void OnHit()
        {
            if (!isActiveAndEnabled) return;
            if (flash != null) StopCoroutine(flash);
            flash = StartCoroutine(FlashRoutine());
        }

        IEnumerator FlashRoutine()
        {
            if (anim != null)
            {
                anim.Renderer.color = ArtHitTint;
                if (unit.IsAlive) anim.Play(ClipName("damage"), false, HitHold, true);
            }
            else
            {
                body.color = Color.white;
            }
            float t = 0f;
            while (t < 0.18f)
            {
                t += Time.deltaTime;
                yield return null;
            }
            flash = null;
            Refresh();
        }

        public void PlayDeath()
        {
            if (!isActiveAndEnabled) return;
            StartCoroutine(DeathRoutine());
        }

        IEnumerator DeathRoutine()
        {
            selectRing.enabled = false;
            highlightRing.enabled = false;
            overwatchArea.gameObject.SetActive(false);
            if (anim != null) anim.Play(ClipName("damage"), false, 99f, false);
            float t = 0f;
            const float dur = 0.45f;
            Vector3 s0 = transform.localScale;
            var sr = anim != null ? anim.Renderer : body;
            while (t < dur)
            {
                t += Time.deltaTime;
                float k = Mathf.Clamp01(t / dur);
                transform.localScale = s0 * (1f - 0.5f * k);
                var c = sr.color;
                c.a = 1f - k;
                sr.color = c;
                yield return null;
            }
            unit.gameObject.SetActive(false);
        }
    }
}