using UnityEngine;

namespace UnityEngine.Experimental.Rendering
{
    public class FreeCamera : MonoBehaviour
    {
        public float m_LookSpeedController = 120f;
        public float m_LookSpeedMouse = 10.0f;
        public float m_MoveSpeed = 50.0f;
        public float m_Turbo = 10.0f;

        private static string kMouseX = "Mouse X";
        private static string kMouseY = "Mouse Y";
        private static string kRightStickX = "Controller Right Stick X";
        private static string kRightStickY = "Controller Right Stick Y";
        private static string kVertical = "Vertical";
        private static string kHorizontal = "Horizontal";
        private string[] m_RequiredInputAxes = { kMouseX, kMouseY, kRightStickX, kRightStickY, kVertical, kHorizontal };

        private bool m_Valid = true;
        void OnEnable()
        {
            m_Valid = Debugging.CheckRequiredInputAxisMapping(m_RequiredInputAxes);
        }

        void Update()
        {
            if (m_Valid)
            {
                float inputRotateAxisX = 0.0f;
                float inputRotateAxisY = 0.0f;
                if (Input.GetMouseButton(1))
                {
                    inputRotateAxisX = Input.GetAxis(kMouseX) * m_LookSpeedMouse;
                    inputRotateAxisY = Input.GetAxis(kMouseY) * m_LookSpeedMouse;
                }
                inputRotateAxisX += (Input.GetAxis(kRightStickX) * m_LookSpeedController * Time.deltaTime);
                inputRotateAxisY += (Input.GetAxis(kRightStickY) * m_LookSpeedController * Time.deltaTime);

                float inputVertical = Input.GetAxis(kVertical);
                float inputHorizontal = Input.GetAxis(kHorizontal);

                bool moved = inputRotateAxisX != 0.0f || inputRotateAxisY != 0.0f || inputVertical != 0.0f || inputHorizontal != 0.0f;
                if (moved)
                {
                    float rotationX = transform.localEulerAngles.x;
                    float newRotationY = transform.localEulerAngles.y + inputRotateAxisX;

                    // Weird clamping code due to weird Euler angle mapping...
                    float newRotationX = (rotationX - inputRotateAxisY);
                    if (rotationX <= 90.0f && newRotationX >= 0.0f)
                        newRotationX = Mathf.Clamp(newRotationX, 0.0f, 90.0f);
                    if (rotationX >= 270.0f)
                        newRotationX = Mathf.Clamp(newRotationX, 270.0f, 360.0f);

                    transform.localRotation = Quaternion.Euler(newRotationX, newRotationY, transform.localEulerAngles.z);

                    float moveSpeed = Time.deltaTime * m_MoveSpeed;
                    if (Input.GetMouseButton(1))
                        moveSpeed *= Input.GetKey(KeyCode.LeftShift) ? m_Turbo : 1.0f;
                    else
                        moveSpeed *= Input.GetAxis("Fire1") > 0.0f ? m_Turbo : 1.0f;
                    transform.position += transform.forward * moveSpeed * inputVertical;
                    transform.position += transform.right * moveSpeed * inputHorizontal;
                }
            }
        }
    }
}