using CodeStage.AntiCheat.ObscuredTypes;
using System.Collections.Generic;
using UnityEngine;

public class Projectile : MonoBehaviour
{
    public float m_Speed = 12f;
    public float radius = 0.1f;

    Vector2 dir;
    Vector2 prevPos;
    ObscuredInt m_ReflectCount;
    float m_LifeTime;

    ProjectileData m_ProjectileData;

    #region 투사체 매니저
    ProjectileMgr owner;
    string prefabKey;

    public void SetOwner(ProjectileMgr mgr, string key)
    {
        owner = mgr;
        prefabKey = key;
    }

    public string GetPoolKey() { return prefabKey; }
    void Kill()
    {
        owner.Return(this);
        // 이펙트 표시 필요
    }
    public ProjectileTableData Get_ProjectileTData() { return m_ProjectileData.m_Data; }
    #endregion

    public void Set(ProjectileData pd)
    {
        m_ProjectileData = pd;
        m_LifeTime = m_ProjectileData.m_Data.n_ProjectileLife;
        if (!m_ProjectileData.IsPC) m_ProjectileData.Ignore_WallHP = false;

        Vector3 pos = pd.tf_Start.position;
        Quaternion rot = pd.tf_Start.rotation;

        /* =============================
         * 직선 화살 위치 분산
         * ============================= */
        if (pd.PreviousArrow > 0)
        {
            int count = pd.PreviousArrow + 1;
            float spacing = 0.5f;
            float offset = (pd.LineIndex - (count - 1) * 0.5f) * spacing;

            pos += pd.tf_Start.right * offset;
        }

        transform.SetPositionAndRotation(pos, rot);

        /* =============================
         * 사선 화살 각도 분산
         * ============================= */
        float angle = 0f;

        if (pd.DiagonalArrow > 0 && pd.DiagIndex > 0)
        {
            int n = pd.DiagonalArrow;

            // 전체 90도 안에서 분산
            float step = 22.5f / (n + 1);

            int index = pd.DiagIndex;   // 1부터
            int tier = (index + 1) / 2; // 1,1,2,2,3,3...

            float offset = step * tier;

            bool right = (index % 2) == 0;
            angle += right ? offset : -offset;
        }

        transform.rotation = Quaternion.AngleAxis(angle, transform.forward) * transform.rotation;

        if (!pd.IsPC)
            transform.eulerAngles += new Vector3(0f, 0f, 180f);

        dir = transform.up.normalized;

        m_ReflectCount = m_ProjectileData.m_Data.n_AttackBounceLimit;
        if (pd.IsPC)
            m_ReflectCount += (int)IngameMgr.Ins.Get_SkillValue(eSkillType.Reflect);

        if (m_ProjectileData.m_Data.n_ProjectileID == 3002)
        {
            transform.eulerAngles = Vector3.zero;
            var lv = IngameMgr.Ins.Get_SkillLv(eSkillType.Explosion);
            var skillTdata = table_skill.Ins.Get_Data(eSkillType.Explosion);
            var scale = skillTdata.f_ExplosionScale + (skillTdata.f_ExplosionScalePerLv * (lv - 1));
            transform.localScale = Vector3.one * scale;
            m_ReflectCount = 0;
        }
        m_ReflectCount.RandomizeCryptoKey();
    }

    void Update()
    {
        if (m_LifeTime > 0)
        {
            m_LifeTime -= Time.deltaTime;
            if (m_LifeTime <= 0f)
            {
                Kill();
                return;
            }
        }

        if (m_ProjectileData.m_Data.n_ProjectileID == 3002 ||
            m_ProjectileData.m_Data.n_ProjectileID == 3301)
            return;

        prevPos = transform.position;

        float moveDist = m_Speed * Time.deltaTime;
        transform.position += (Vector3)(dir * moveDist);
    }

    private void OnTriggerEnter2D(Collider2D collision)
    {
        if (!m_ProjectileData.IsPC && collision.tag == "Mob") return;
        if (m_ProjectileData.Ignore_WallHP && collision.tag == "Wall_HP")
        {
            m_ProjectileData.Ignore_WallHP = false;
            return;
        }

        Check_Hit(collision);

        if (m_ProjectileData.m_Data.n_ProjectileID == 3002 ||
            m_ProjectileData.m_Data.n_ProjectileID == 3301)
            return;

        if (m_ProjectileData.Pierce > 0)
        {
            --m_ProjectileData.Pierce;
            return;
        }

        if (m_ReflectCount <= 0)
        {
            Kill();
            return;
        }

        Vector2 currentPos = transform.position;
        Vector2 moveVec = currentPos - prevPos;
        float distance = moveVec.magnitude;
        Vector2 moveDir = distance > 0 ? moveVec / distance : dir;

        // CircleCast로 정확한 충돌 지점(centroid)과 법선 탐색
        RaycastHit2D[] hits = Physics2D.CircleCastAll(prevPos, radius, moveDir, distance);
        RaycastHit2D hit = new RaycastHit2D();
        bool found = false;

        foreach (var h in hits)
        {
            if (h.collider == collision)
            {
                // 자기 자신(시작 위치에서 걸리는 경우) 제외 로직이 필요할 수 있으나,
                // distance > 0 체크 등으로 보완. 여기서는 가장 먼저 닿는 지점을 찾음.
                hit = h;
                found = true;
                break;
            }
        }

        Vector2 normal;
        Vector2 targetPos;

        if (found)
        {
            normal = hit.normal;
            // CircleCast의 centroid는 충돌 시의 원의 중심 위치입니다.
            targetPos = hit.centroid; 
        }
        else
        {
            // fallback: ClosestPoint
            Vector2 closestRef = collision.ClosestPoint(prevPos);
            normal = (prevPos - closestRef).normalized;
            if (normal == Vector2.zero)
            {
                normal = (prevPos - (Vector2)collision.bounds.center).normalized;
            }
            targetPos = closestRef + normal * radius;
        }

        // 반사
        dir = Vector2.Reflect(dir, normal).normalized;
        m_ReflectCount--;
        m_ReflectCount.RandomizeCryptoKey();

        // 회전
        float angle = Mathf.Atan2(dir.y, dir.x) * Mathf.Rad2Deg - 90f;
        transform.rotation = Quaternion.Euler(0, 0, angle);

        // 위치 보정
        transform.position = targetPos;
    }

    void Check_Hit(Collider2D collision)
    {
        if (m_ProjectileData.IsPC)
        {
            switch(collision.tag)
            {
                case "Mob":
                    Show_Hit_Effect();
                    collision.GetComponent<MobActor>().Get_Dmg(m_ProjectileData);
                    Spawn_LeftRight(collision.transform);
                    Spawn_UpDown(collision.transform);
                    Spawn_Bounce(collision.GetComponent<MobActor>());
                    break;
                case "MobShield":
                    Show_Hit_Effect();
                    collision.GetComponent<MobShield>().Get_Dmg();
                    break;
            }
        }
        else
        {
            if (collision.tag == "Wall_HP")
            {
                Show_Hit_Effect();
                IngameMgr.Ins.Get_Dmg(m_ProjectileData.Dmg);
            }
        }
    }
    void Show_Hit_Effect()
    {
        if (!string.IsNullOrEmpty(m_ProjectileData.m_Data.s_HitEffect))
            EffectMgr.Ins.Show_Effect(m_ProjectileData.m_Data.s_HitEffect, transform.position);
    }

    public void SetDirection(Vector2 direction)
    {
        dir = direction.normalized;

        // 방향에 맞게 회전도 맞춰줌
        float angle = Mathf.Atan2(dir.y, dir.x) * Mathf.Rad2Deg - 90f;
        transform.rotation = Quaternion.Euler(0, 0, angle);
    }

    List<float> GetOffsets(int count, float spacing)
    {
        List<float> offsets = new List<float>();

        float start = -(count - 1) * 0.5f;

        for (int i = 0; i < count; i++)
            offsets.Add((start + i) * spacing);

        return offsets;
    }

    void SpawnExtra(Vector3 pos, Vector3 dir)
    {
        var p = ProjectileMgr.Ins.Get(m_ProjectileData.m_Data.s_ProjectilePrefabs);
        p.Set(new ProjectileData
        {
            IsPC = m_ProjectileData.IsPC,
            m_Data = m_ProjectileData.m_Data,
            tf_Start = transform,
            Dmg = m_ProjectileData.Dmg,
            Ignore_WallHP = false,

            ArrowLeftRight = 0,
            ArrowUpDown = 0,
            Bounce = m_ProjectileData.Bounce,
            Pierce = m_ProjectileData.Pierce,
        });

        p.transform.position = pos;
        p.SetDirection(dir);
    }

    void Spawn_LeftRight(Transform tf)
    {
        if (m_ProjectileData.ArrowLeftRight <= 0) return;

        Vector3 hitPos = tf.position;
        float spacing = 0.5f;
        int count = m_ProjectileData.ArrowLeftRight;
        var offsets = GetOffsets(count, spacing);

        foreach (float offset in offsets)
        {
            // ▶ 오른쪽
            SpawnExtra(hitPos + Vector3.up * (offset + 0.5f), Vector2.right);
            // ◀ 왼쪽
            SpawnExtra(hitPos + Vector3.up * (offset + 0.5f), Vector2.left);
        }
    }
    void Spawn_UpDown(Transform tf)
    {
        if (m_ProjectileData.ArrowUpDown <= 0) return;

        Vector3 hitPos = tf.position;
        float spacing = 0.5f;
        int count = m_ProjectileData.ArrowUpDown;
        var offsets = GetOffsets(count, spacing);

        foreach (float offset in offsets)
        {
            // ▲ 위
            SpawnExtra(hitPos + Vector3.right * offset + Vector3.up * 1.5f, Vector2.up);

            // ▼ 아래
            SpawnExtra(hitPos + Vector3.right * offset + Vector3.down * 0.5f, Vector2.down);
        }
    }
    void Spawn_Bounce(MobActor mob)
    {
        if (m_ProjectileData.Bounce <= 0 || mob == null) return;

        MobActor target = IngameMgr.Ins.FindNearestMob(mob.transform.position, mob);
        if (target == null)
        {
            Kill();
            return;
        }

        --m_ProjectileData.Bounce;
        SpawnExtra(mob.transform.position, target.transform.position - mob.transform.position);
    }
}

public class ProjectileData
{
    public ProjectileTableData m_Data;
    public Transform tf_Start;
    ObscuredBool _IsPC; public bool IsPC { get { return _IsPC; } set { _IsPC = value; _IsPC.RandomizeCryptoKey(); } }
    ObscuredInt _Lv; public int Lv { get { return _Lv; } set { _Lv = value; _Lv.RandomizeCryptoKey(); } }
    ObscuredInt _Dmg; public int Dmg { get { return _Dmg; } set { _Dmg = value; _Dmg.RandomizeCryptoKey(); } }

    public bool Ignore_WallHP;

    // 발사 계열
    public int PreviousArrow;
    public int DiagonalArrow;
    public int LineIndex;
    public int DiagIndex;

    // 피격 계열
    public int ArrowLeftRight;
    public int ArrowUpDown;
    public int Bounce;
    public int Pierce;
}