using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using SiegeSong;

namespace SiegeSong
{
    public class CameraManager : MonoBehaviour
    {
        public RuntimeManager RuntimeManager;

        public Motor Motor;

        public GameObject ActiveCamera;

        public bool FirstPersonActive;

        public Transform CameraTarget;

        public Transform MenuMount;

        public Transform ActiveMount;

        public Transform FirstPersonMount;
        public Transform LeftMount;
        public Transform RightMount;
        public Transform CenterMount;
        public List<Transform> AutoMounts;
        public List<Transform> StationMounts;

        public GameObject[] NonPlayerCameras;

        public float CameraX;
        public float CameraY;

        private int activeCameraIndex;

        private float speedX = 200.0f;
        private float speedY = 100.0f;
        
        private float minX = -90.0f;
        private float maxX = 90.0f;
        
        private float minY = -70.0f;
        private float maxY = 90.0f;
        private float zoomStep = 0.1f;

        private float firstPersonMinY = -170.0f;
        private float firstPersonMaxY = 130.0f;
        
        private float zoomSpeed = 0.1f;
        private float zoom = 2.0f;
        private float requestedZoom = 2.0f;
        private float minZoom = -0.2f;
        private float maxZoom = 0.5f;
        private bool canZoomToRequested = true;
        private bool zooming;
        private bool zoomCollision;

        private bool lerping;
        private Vector3 lerpStartPosition;
        private Vector3 lerpTargetPosition;
        private float lerpStartTime;
        private float lerpDistance;
        private float lerpSpeed = 3.5f;
        private float lerpStopDistanceThreshold = 0.02f;


        private float rotationSpeedBrakeSpeed = 2.0f;
        private float rotationSpeedStopThreshold = 0.1f;


        //public CameraMode ActiveMode;

        void Start()
        {
            ActiveMount = MenuMount;
        }

        void Update()
        {
            ActiveCamera.transform.position = ActiveMount.position;

            if (Motor.UsingStation)
            {
                CameraX = Motor.TargetStation.CameraX;
                CameraY = Motor.TargetStation.CameraY;
            }

            if (lerping)
            {
                ActiveCamera.transform.position = Vector3.Lerp(lerpStartPosition, lerpTargetPosition, ((Time.time - lerpStartTime) * lerpSpeed) / lerpDistance);
                if (Vector3.Distance(ActiveCamera.transform.position, lerpTargetPosition) < lerpStopDistanceThreshold)
                    lerping = false;
            }
            //else if (lerpTargetPosition != null)
            //{
            //    ActiveCamera.transform.position = lerpTargetPosition;
            //}

            if (!zoomCollision)
            {
                for (var i = 0; i < ActiveCamera.transform.childCount; i++)
                {
                    var child = ActiveCamera.transform.GetChild(i);
                    if (child.gameObject.CompareTag("MainCamera") && !FirstPersonActive)
                    {
                        child.position = new Vector3(child.position.x, child.position.y, child.position.z + zoom);
                        zoom = 0;
                    }
                }
            }
        }

        public void SwitchActiveCamera(Camera targetCamera)
        {

        }

        public void ZoomIn()
        {
            if (!FirstPersonActive)
            {
                if (zoom - zoomStep > minZoom)
                {
                    zoom -= zoomStep;
                }
                else
                {
                    zoom = minZoom;
                }
            }
        }

        public void ZoomOut(bool request = true)
        {
            if (!FirstPersonActive)
            {
                zoom += zoomStep;
            }
            if (!FirstPersonActive)
            {
                if (zoom + zoomStep < maxZoom)
                {
                    zoom += zoomStep;
                }
                else
                {
                    zoom = maxZoom;
                }
            }
        }

        public void ResetCameraPosition()
        {
            ActiveCamera.transform.position = ActiveMount.transform.position;
        }

        public void RealignCamera(bool rotateBody = false)
        {
            if (!rotateBody)
            {
                if (CameraX < rotationSpeedStopThreshold && CameraX > -rotationSpeedStopThreshold)
                    CameraX = 0;
                else
                    CameraX = CameraX / rotationSpeedBrakeSpeed;
            }
            else
            {
                Motor.RotateToDirection(ActiveMount.eulerAngles);
                //Motor.RotateToDirection(ActiveCamera.transform.eulerAngles);

                ActiveMount.RotateAround(CameraTarget.position, Vector3.up, -CameraX);
                ActiveCamera.transform.rotation.SetLookRotation(CameraTarget.position);
                ActiveCamera.transform.rotation = Quaternion.Euler(-ActiveCamera.transform.rotation.x, ActiveCamera.transform.rotation.y, ActiveCamera.transform.rotation.z);
                //ActiveCamera.transform.RotateAround(CameraTarget.position, Vector3.up, -CameraX);

                CameraX = 0;
            }
        }

        public void RotateMotor(Vector3 eulerAngles)
        {
            Motor.RotateToDirection(eulerAngles);
            ActiveMount.RotateAround(CameraTarget.position, Vector3.up, -eulerAngles.x);
            //ActiveCamera.transform.RotateAround(CameraTarget.position, Vector3.up, -eulerAngles.x);
        }

        public void RotateHorizontal(float amount)
        {
            var degreesToRotate = amount * speedX * Time.deltaTime;

            CameraX += degreesToRotate;
            ActiveMount.RotateAround(CameraTarget.position, Vector3.up, amount * speedX * Time.deltaTime);
            //ActiveCamera.transform.RotateAround(CameraTarget.position, Vector3.up, amount * speedX * Time.deltaTime);
        }

        public void RotateVertical(float amount)
        {
            var degreesToRotate = amount * speedY * Time.deltaTime;
            if (degreesToRotate > 0 && !(CameraY + degreesToRotate > (FirstPersonActive ? firstPersonMaxY : maxY))
                || (degreesToRotate < 0 && !(CameraY + degreesToRotate < (FirstPersonActive ? firstPersonMinY : minY))))
            {
                CameraY += degreesToRotate;
                ActiveCamera.transform.RotateAround(CameraTarget.position, ActiveCamera.transform.TransformDirection(-Vector3.right), amount * speedY * Time.deltaTime);
            }
        }

        public void SwitchCamera()
        {
            ActiveCamera.transform.RotateAround(CameraTarget.position, ActiveCamera.transform.TransformDirection(-Vector3.right), -CameraY);
            CameraY = 0;
            if (FirstPersonActive)
                FirstPersonActive = false;
            if (activeCameraIndex - 3 == AutoMounts.Count + StationMounts.Count)
                activeCameraIndex = 0;
            else
                activeCameraIndex++;
            lerping = true;
            lerpStartTime = Time.time;
            lerpStartPosition = ActiveCamera.transform.position;
            switch (activeCameraIndex)
            {
                case 0:
                    FirstPersonActive = true;
                    lerpTargetPosition = FirstPersonMount.position;
                    ActiveMount = FirstPersonMount;
                    break;
                case 1:
                    lerpTargetPosition = RightMount.position;
                    ActiveMount = RightMount;
                    break;
                case 2:
                    lerpTargetPosition = CenterMount.position;
                    ActiveMount = CenterMount;
                    break;
                case 3:
                    lerpTargetPosition = LeftMount.position;
                    ActiveMount = LeftMount;
                    break;
                default:
                case 4:
                    if (activeCameraIndex - 3 > AutoMounts.Count)
                    {
                        lerpTargetPosition = StationMounts[activeCameraIndex - 3 - AutoMounts.Count].position;
                        ActiveMount = StationMounts[activeCameraIndex - 3 - AutoMounts.Count];
                    }
                    else
                    {
                        lerpTargetPosition = StationMounts[activeCameraIndex - 3].position;
                        ActiveMount = StationMounts[activeCameraIndex - 3];
                    }
                    break;

            }
            lerpDistance = Vector3.Distance(ActiveCamera.transform.position, lerpTargetPosition);
        }
    }
}