1 files changed, 121 insertions, 0 deletions
diff --git a/Assets/Scripts/Camera/CameraFollow.cs b/Assets/Scripts/Camera/CameraFollow.cs
new file mode 100644
index 0000000..47b96f4
--- /dev/null
+++ b/Assets/Scripts/Camera/CameraFollow.cs
@@ -0,0 +1,121 @@
+using System;
+using JetBrains.Annotations;
+using UnityEngine;
+
+namespace Camera
+{
+    public class CameraFollow : MonoBehaviour
+    {
+        [CanBeNull] public static CameraFollow Current;
+        private Transform _followTarget;
+        
+        private float _defaultYaw;
+        private bool _enableMove;
+        private float _height;
+        
+        [CanBeNull]
+        public Transform followTarget
+        {
+            get => _followTarget;
+            set {
+                if (_followTarget == value) return;
+                
+                _followTarget = value;
+        
+                if (_followTarget != null)
+                    OnFollowTargetChanged(value);
+                else
+                    OnFollowTargetLost();
+            }
+        }
+        
+        private void Awake()
+        {
+            _defaultYaw = rotationYaw.eulerAngles.y;
+            
+            if (Current != null)
+                Debug.LogWarning("Duplicate CameraFollow Found!");
+            Current = this;
+            followTarget = defaultFollowTarget;
+        }
+
+        [Header("Parameters")] 
+        [SerializeField] private bool enableYaw;
+        [SerializeField] private Transform defaultFollowTarget;
+        [SerializeField] [Range(0.015f, 1f)] private float yawRotationLerp;
+        [SerializeField] [Range(0.015f, 1f)] private float positionLerp;
+        [SerializeField] [Range(0.015f, 1f)] private float heightLerp;
+        [SerializeField] private LayerMask heightCheckLayerMask;
+
+        [Header("Bindings")] 
+        [SerializeField] private Transform rotationYaw;
+        [SerializeField] private Transform rotationPitch;
+        [SerializeField] private Transform positionCamera;
+        [SerializeField] private Transform positionHeight;
+
+        private void OnFollowTargetChanged([CanBeNull] Transform target)
+        {
+            Debug.Log($"Follow target: {target?.name}");
+            _enableMove = target != null;
+        }
+        
+        private void OnFollowTargetLost()
+        {
+            Debug.Log("Follow target lost");
+            _enableMove = false;
+        }
+        
+        private void FixedUpdate()
+        {
+            FixedUpdateHeight();
+            
+            if (_enableMove)
+            {
+                try
+                {
+                    FixedUpdateMoveCamera();
+                }
+                catch (NullReferenceException)
+                {
+                    OnFollowTargetLost();
+                }
+            }
+        }
+
+        private void FixedUpdateMoveCamera()
+        {
+            var transformYaw = _followTarget.rotation.eulerAngles.y;
+            var transformPosition = _followTarget.position;
+
+            var targetYaw = transformYaw;
+            var targetYawRotation = Quaternion.Euler(0, enableYaw ? targetYaw : _defaultYaw, 0);
+            var targetPosition = new Vector3(transformPosition.x, 0, transformPosition.z);
+            
+            transform.position = Vector3.Lerp(transform.position, targetPosition, positionLerp);
+            rotationYaw.rotation = Quaternion.Lerp(rotationYaw.rotation, targetYawRotation, yawRotationLerp);
+            positionHeight.position = new Vector3(
+                transformPosition.x,
+                Mathf.Lerp(positionHeight.position.y, _height, heightLerp),
+                transformPosition.z
+                );
+        }
+
+        private void FixedUpdateHeight()
+        {
+            var transformPosition = transform.position;
+            var start = transformPosition + Vector3.up * 100;
+            var end = transformPosition + Vector3.down * 100;
+            Physics.Linecast(start, end, out RaycastHit hit, heightCheckLayerMask);
+            if (hit.collider == null)
+                _height = transformPosition.y;
+            else
+                _height = hit.point.y;
+        }
+        
+        private void OnDestroy()
+        {
+            if (Current == this)
+                Current = null;
+        }
+    }
+}