using UnityEngine;
using UnityEngine.InputSystem;

[RequireComponent(typeof(Rigidbody2D))]
[RequireComponent(typeof(Collider2D))]
public class BallScript : MonoBehaviour
{
    [Header("Launch")]
    [SerializeField] private float launchSpeed = 10f;
    [Tooltip("Maximum random angle (degrees) from straight up on launch.")]
    [SerializeField] private float maxLaunchAngle = 30f;
    [Tooltip("Base damage before ball effects modify it.")]
    [SerializeField] private float baseDamage = 1f;

    [Header("References")]
    [Tooltip("Assign the Paddle transform in the Inspector, or tag the paddle 'Paddle' for auto-find.")]
    [SerializeField] private Transform paddle;
    [Tooltip("Offset above the paddle centre where the ball sits before launch.")]
    [SerializeField] private Vector3 spawnOffset = new Vector3(0f, 0.7f, 0f);

    public float LaunchSpeed => launchSpeed;
    public float BaseDamage => baseDamage;
    public Rigidbody2D Body => _rb;
    public bool IsQueueManaged => _isQueueManaged;
    public bool IsInPlay => _rb != null && _rb.simulated && _collider != null && _collider.enabled;

    private Rigidbody2D _rb;
    private Collider2D _collider;
    private Renderer _renderer;
    private Material[] _baseMaterials;

    private bool _launched;
    private bool _followPaddleWhenUnlaunched = true;
    private bool _isQueueManaged;

    private BallEffectBase[] _effects;
    private Vector3 _initialScale;
    private float _damageMultiplier = 1f;
    private Vector2 _prePhysicsVelocity;

    void Awake()
    {
        _rb = GetComponent<Rigidbody2D>();
        _collider = GetComponent<Collider2D>();
        _renderer = GetComponentInChildren<Renderer>();
        _effects = GetComponents<BallEffectBase>();

        _rb.gravityScale = 0f;
        _rb.linearDamping = 0f;
        _rb.angularDamping = 0f;
        _rb.collisionDetectionMode = CollisionDetectionMode2D.Continuous;
        _initialScale = transform.localScale;

        // Use physics to handle bouncing naturally - bounciness = 1 means perfect reflection.
        // Friction = 0 means no slowdown.
        var mat = new PhysicsMaterial2D { bounciness = 1f, friction = 0f };
        _collider.sharedMaterial = mat;

        if (_renderer != null)
            _baseMaterials = _renderer.sharedMaterials;
    }

    void Start()
    {
        if (paddle == null)
            paddle = GameObject.FindGameObjectWithTag("Paddle")?.transform;

        _launched = false;
    }

    void Update()
    {
        if (_launched || !_followPaddleWhenUnlaunched)
            return;

        // Follow the paddle until launched.
        if (paddle != null)
            transform.position = paddle.position + spawnOffset;

        bool spacePressed = Keyboard.current != null && Keyboard.current.spaceKey.wasPressedThisFrame;
        bool mousePressed = Mouse.current != null && Mouse.current.leftButton.wasPressedThisFrame;
        if (spacePressed || mousePressed)
            Launch();
    }

    void FixedUpdate()
    {
        if (!_launched)
            return;

        // Store incoming velocity for collision-response effects (e.g. piercing).
        _prePhysicsVelocity = _rb.linearVelocity;

        Vector2 velocity = _rb.linearVelocity;
        for (int i = 0; i < _effects.Length; i++)
        {
            BallEffectBase effect = _effects[i];
            if (effect != null && effect.isActiveAndEnabled)
                effect.ModifyVelocity(this, ref velocity, Time.fixedDeltaTime);
        }

        _rb.linearVelocity = velocity;
    }

    public void SetQueueManaged(bool value)
    {
        _isQueueManaged = value;
    }

    public void SetPaddleReference(Transform paddleTransform, Vector3 offset)
    {
        paddle = paddleTransform;
        spawnOffset = offset;
    }

    public void ParkAtPosition(Vector3 worldPosition)
    {
        _launched = false;
        _followPaddleWhenUnlaunched = false;
        _rb.linearVelocity = Vector2.zero;
        _rb.simulated = false;
        _collider.enabled = false;
        transform.position = worldPosition;
    }

    public void PrepareOnPaddle()
    {
        _launched = false;
        _followPaddleWhenUnlaunched = true;
        _rb.simulated = true;
        _collider.enabled = true;
        _rb.linearVelocity = Vector2.zero;
        _damageMultiplier = 1f;
        transform.localScale = _initialScale;

        if (paddle == null)
            paddle = GameObject.FindGameObjectWithTag("Paddle")?.transform;

        if (paddle != null)
            transform.position = paddle.position + spawnOffset;

        for (int i = 0; i < _effects.Length; i++)
        {
            BallEffectBase effect = _effects[i];
            if (effect != null && effect.isActiveAndEnabled)
                effect.OnBallReset(this);
        }
    }

    /// <summary>Called by DeathZoneScript for fallback non-queue behavior.</summary>
    public void ResetBall()
    {
        PrepareOnPaddle();
    }

    public void SetEffectDefinition(BallEffectDefinition effectDefinition)
    {
        // Disable all currently attached effects first.
        BallEffectBase[] allEffects = GetComponents<BallEffectBase>();
        for (int i = 0; i < allEffects.Length; i++)
            allEffects[i].enabled = false;

        ApplyOverlayMaterial(effectDefinition != null ? effectDefinition.OverlayMaterial : null);

        if (effectDefinition == null)
        {
            Debug.Log($"[{gameObject.name}] SetEffectDefinition: Received NULL definition (no effect assigned)");
            RebuildEffectsCache();
            return;
        }

        Debug.Log($"[{gameObject.name}] SetEffectDefinition: Assigning effect type: {effectDefinition.EffectType}");

        MonoBehaviour selected = null;
        switch (effectDefinition.EffectType)
        {
            case BallEffectType.TripleSplit:
                Debug.Log($"[{gameObject.name}] Matched TripleSplit case");
                selected = GetOrAddEffect<TripleSplitEffect>();
                break;
            case BallEffectType.Explosive:
                Debug.Log($"[{gameObject.name}] Matched Explosive case");
                selected = GetOrAddEffect<ExplosiveHitEffect>();
                break;
            case BallEffectType.Piercing:
                Debug.Log($"[{gameObject.name}] Matched Piercing case");
                selected = GetOrAddEffect<PiercingEffect>();
                break;
            case BallEffectType.Homing:
                Debug.Log($"[{gameObject.name}] Matched Homing case");
                selected = GetOrAddEffect<HomingEffect>();
                break;
            case BallEffectType.Teleport:
                Debug.Log($"[{gameObject.name}] Matched Teleport case");
                selected = GetOrAddEffect<TeleportEffect>();
                break;
            case BallEffectType.None:
            default:
                Debug.LogError($"[{gameObject.name}] ERROR: EffectType is None or unrecognized: {effectDefinition.EffectType}");
                break;
        }

        if (selected is BallEffectBase effectBase)
        {
            Debug.Log($"[{gameObject.name}] Successfully enabled effect: {selected.GetType().Name}");
            effectBase.SetDefinition(effectDefinition);
            selected.enabled = true;
        }
        else
        {
            Debug.LogError($"[{gameObject.name}] ERROR: selected component is not a BallEffectBase! Type: {selected?.GetType().Name ?? "NULL"}");
        }

        RebuildEffectsCache();
    }

    public void ApplyOverlayMaterial(Material overlayMaterial)
    {
        if (_renderer == null)
            return;

        if (overlayMaterial == null)
        {
            _renderer.sharedMaterials = _baseMaterials;
            return;
        }

        Material[] stacked = new Material[_baseMaterials.Length + 1];
        for (int i = 0; i < _baseMaterials.Length; i++)
            stacked[i] = _baseMaterials[i];

        stacked[stacked.Length - 1] = overlayMaterial;
        _renderer.sharedMaterials = stacked;
    }

    public float GetDamageAgainstBlock(blockScript block, Collision2D collision)
    {
        float damage = baseDamage * _damageMultiplier;
        for (int i = 0; i < _effects.Length; i++)
        {
            BallEffectBase effect = _effects[i];
            if (effect != null && effect.isActiveAndEnabled)
                damage = effect.ModifyBlockDamage(this, block, collision, damage);
        }

        return Mathf.Max(0f, damage);
    }

    public void NotifyHitBlock(blockScript block, Collision2D collision)
    {
        for (int i = 0; i < _effects.Length; i++)
        {
            BallEffectBase effect = _effects[i];
            if (effect != null && effect.isActiveAndEnabled)
                effect.OnHitBlock(this, block, collision);
        }
    }

    public void MultiplyDamage(float multiplier)
    {
        _damageMultiplier *= multiplier;
    }

    public void MultiplyScale(float scaleMultiplier)
    {
        transform.localScale *= scaleMultiplier;
    }

    public float GetCurrentSpeed()
    {
        float speed = _rb.linearVelocity.magnitude;
        return speed > 0.001f ? speed : launchSpeed;
    }

    public Vector2 GetPrePhysicsVelocity()
    {
        if (_prePhysicsVelocity.sqrMagnitude > 0.0001f)
            return _prePhysicsVelocity;

        return _rb.linearVelocity;
    }

    public void LaunchInDirection(Vector2 direction, float speed)
    {
        _launched = true;
        _followPaddleWhenUnlaunched = false;
        _rb.simulated = true;
        _collider.enabled = true;

        Vector2 dir = direction.sqrMagnitude > 0.0001f ? direction.normalized : Vector2.up;
        _rb.linearVelocity = dir * speed;
    }

    public BallScript SpawnClone(Vector2 direction, float speedMultiplier, float scaleMultiplier, float damageMultiplier)
    {
        GameObject cloneObject = Instantiate(gameObject, transform.position, Quaternion.identity);
        BallScript cloneBall = cloneObject.GetComponent<BallScript>();
        if (cloneBall == null)
            return null;

        // Clones are temporary gameplay balls and do not consume queue slots.
        cloneBall.SetQueueManaged(false);
        cloneBall.SetPaddleReference(paddle, spawnOffset);
        cloneBall.LaunchInDirection(direction, launchSpeed * speedMultiplier);
        cloneBall.MultiplyScale(scaleMultiplier);
        cloneBall.MultiplyDamage(damageMultiplier);
        return cloneBall;
    }

    private void Launch()
    {
        _launched = true;
        float angle = Random.Range(-maxLaunchAngle, maxLaunchAngle) * Mathf.Deg2Rad;
        _rb.linearVelocity = new Vector2(Mathf.Sin(angle), Mathf.Cos(angle)) * launchSpeed;

        for (int i = 0; i < _effects.Length; i++)
        {
            BallEffectBase effect = _effects[i];
            if (effect != null && effect.isActiveAndEnabled)
                effect.OnBallLaunched(this);
        }
    }

    private T GetOrAddEffect<T>() where T : MonoBehaviour
    {
        T existing = GetComponent<T>();
        if (existing != null)
            return existing;

        return gameObject.AddComponent<T>();
    }

    private void RebuildEffectsCache()
    {
        _effects = GetComponents<BallEffectBase>();
    }
}