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

public class throwObjectTrayectorySystem : MonoBehaviour
{
    [Header ("Main Settings")]
    [Space]

    public bool throwObjectEnabled = true;

    public LayerMask layerToCheckThrowObject;
    public float maxRaycastDistance = 30;

    public bool useInfiniteRaycastDistance;

    public bool useMaxDistanceWhenNoSurfaceFound;
    public float maxDistanceWhenNoSurfaceFound;

    [Space]

    public Transform throwPosition;

    [Space]

    public GameObject objectToThrow;

    [Space]
    [Header ("Other Settings")]
    [Space]

    public bool addLaunchObjectComponent;
    public bool addGrabbedObjectStateComponent;

    public bool rotateObjectTowardThrowDirection;

    public bool checkIfLockedCameraActive;

    public bool ignoreCollisionsWithPlayerEnabled = true;

    [Space]
    [Header ("Custom Throw Direction Settings")]
    [Space]

    public bool throwInCustomTransformDirection;
    public Transform customTransformDirection;
    public float customThrowDirectionAmount = 400;

    [Space]

    public bool useCustomThrowPosition;
    public bool useCustomThrowLocalPosition;
    public Vector3 customThrowPosition;
    public Vector3 customThrowRotation;

    [Space]
    [Header ("Debug")]
    [Space]

    public bool showGizmo;

    public GameObject currentObjectToThrow;
    public Vector3 currentThrowSpeed;

    [Space]
    [Header ("Components")]
    [Space]

    public playerCamera mainPlayerCamera;
    public GameObject playerControllerGameObject;
    public Transform targetPositionTransform;

    public Transform playerCameraGameObject;
    public Transform mainCameraTransform;

    public Collider playerCollider;


    Rigidbody newObjectToThrowRigidbody;

    RaycastHit hit;

    Vector3 currentTargetPosition;

    Vector3 raycastDirection;
    Vector3 raycastOrigin;

    Ray newRay;


    public void setCurrentObjectToThrow (GameObject newObject)
    {
        if (throwPosition == null) {
            throwPosition = transform;
        }

        currentObjectToThrow = newObject;

        currentObjectToThrow.transform.SetParent (throwPosition);

        Vector3 objectPosition = throwPosition.position;

        if (useCustomThrowPosition) {
            objectPosition = customThrowPosition;
        }

        if (useCustomThrowLocalPosition) {
            currentObjectToThrow.transform.localPosition = objectPosition;
            currentObjectToThrow.transform.localRotation = Quaternion.Euler (customThrowRotation);
        } else {
            currentObjectToThrow.transform.position = objectPosition;
        }

        currentObjectToThrow.SetActive (true);

        newObjectToThrowRigidbody = currentObjectToThrow.GetComponent<Rigidbody> ();

        if (newObjectToThrowRigidbody != null) {
            newObjectToThrowRigidbody.isKinematic = true;
        }

        if (ignoreCollisionsWithPlayerEnabled) {
            if (playerCollider != null) {
                Component [] components = currentObjectToThrow.GetComponentsInChildren (typeof (Collider));

                foreach (Collider child in components) {
                    Physics.IgnoreCollision (playerCollider, child, true);
                }
            }
        }
    }

    public void instantiateObject ()
    {
        if (currentObjectToThrow == null) {
            if (throwPosition == null) {
                throwPosition = transform;
            }

            Vector3 objectPosition = throwPosition.position;
            Quaternion objectRotation = throwPosition.rotation;

            if (useCustomThrowPosition) {
                objectPosition = customThrowPosition;
                objectRotation = Quaternion.Euler (customThrowRotation);
            }

            GameObject newObjectToThrow = (GameObject)Instantiate (objectToThrow, objectPosition, objectRotation);

            setCurrentObjectToThrow (newObjectToThrow);
        }
    }

    public void calculateThrowDirection ()
    {
        raycastDirection = mainCameraTransform.TransformDirection (Vector3.forward);

        raycastOrigin = mainCameraTransform.position;

        bool isPlayerMovingOn3dWorld = !mainPlayerCamera.is2_5ViewActive ();

        if (checkIfLockedCameraActive) {
            if (mainPlayerCamera != null) {
                if (!mainPlayerCamera.isCameraTypeFree () && isPlayerMovingOn3dWorld) {
                    newRay = mainPlayerCamera.getCameraRaycastDirection ();

                    raycastDirection = newRay.direction;

                    raycastOrigin = newRay.origin;
                }
            }
        }

        currentTargetPosition = targetPositionTransform.position;

        float currentRaycastDistance = maxRaycastDistance;

        if (useInfiniteRaycastDistance) {
            currentRaycastDistance = Mathf.Infinity;
        }

        if (Physics.Raycast (raycastOrigin, raycastDirection, out hit, currentRaycastDistance, layerToCheckThrowObject)) {
            currentTargetPosition = hit.point;

            if (hit.collider == playerCollider) {
                Vector3 newRaycastPosition = hit.point + raycastDirection * 0.2f;

                if (Physics.Raycast (newRaycastPosition, raycastDirection, out hit, currentRaycastDistance, layerToCheckThrowObject)) {
                    currentTargetPosition = hit.point;
                }
            }
        } else {
            if (useMaxDistanceWhenNoSurfaceFound) {
                currentTargetPosition = raycastOrigin + raycastDirection * maxDistanceWhenNoSurfaceFound;

            } else {
                if (Physics.Raycast (targetPositionTransform.position, raycastDirection, out hit, Mathf.Infinity, layerToCheckThrowObject)) {
                    currentTargetPosition = hit.point;

                    if (hit.collider == playerCollider) {
                        Vector3 newRaycastPosition = hit.point + raycastDirection * 0.2f;

                        if (Physics.Raycast (newRaycastPosition, raycastDirection, out hit, Mathf.Infinity, layerToCheckThrowObject)) {
                            currentTargetPosition = hit.point;
                        }
                    }
                }
            }
        }

        if (showGizmo) {
            Debug.DrawLine (raycastOrigin, currentTargetPosition, Color.black, 5);
        }
    }

    public void throwObject ()
    {
        if (throwPosition == null) {
            throwPosition = transform;
        }

        if (currentObjectToThrow == null) {
            instantiateObject ();
        }

        if (throwInCustomTransformDirection) {
            currentThrowSpeed = customTransformDirection.forward * customThrowDirectionAmount;
        } else {
            currentThrowSpeed = getParableSpeed (currentObjectToThrow.transform.position, currentTargetPosition);
        }

        if (showGizmo) {
            Debug.DrawLine (currentObjectToThrow.transform.position, currentTargetPosition, Color.black, 5);
        }

        if (rotateObjectTowardThrowDirection) {
            currentObjectToThrow.transform.LookAt (currentTargetPosition);
        }

        currentObjectToThrow.transform.SetParent (null);

        if (currentThrowSpeed == -Vector3.one) {
            currentThrowSpeed = currentObjectToThrow.transform.forward * 100;
        }

        if (newObjectToThrowRigidbody != null) {
            newObjectToThrowRigidbody.isKinematic = false;

            newObjectToThrowRigidbody.AddForce (currentThrowSpeed, ForceMode.VelocityChange);
        }

        if (addLaunchObjectComponent) {
            launchedObjects currentLaunchedObjects = currentObjectToThrow.GetComponent<launchedObjects> ();

            if (currentLaunchedObjects == null) {
                currentLaunchedObjects = currentObjectToThrow.AddComponent<launchedObjects> ();
            }

            currentLaunchedObjects.setCurrentPlayer (playerControllerGameObject);
        }

        if (addGrabbedObjectStateComponent) {
            applyDamage.checkGravityRoomForGrabbedObject (currentObjectToThrow, playerControllerGameObject);
        }

        currentObjectToThrow = null;
    }

    //calculate the speed applied to the launched projectile to make a parable according to a hit point
    Vector3 getParableSpeed (Vector3 origin, Vector3 target)
    {
        //get the distance between positions
        Vector3 toTarget = target - origin;
        Vector3 toTargetXZ = toTarget;

        //remove the Y axis value
        toTargetXZ -= playerCameraGameObject.transform.InverseTransformDirection (toTargetXZ).y * playerCameraGameObject.transform.up;
        float y = playerCameraGameObject.transform.InverseTransformDirection (toTarget).y;
        float xz = toTargetXZ.magnitude;

        //get the velocity accoring to distance ang gravity
        float t = GKC_Utils.distance (origin, target) / 20;
        float v0y = y / t + 0.5f * Physics.gravity.magnitude * t;
        float v0xz = xz / t;

        //create result vector for calculated starting speeds
        Vector3 result = toTargetXZ.normalized;

        //get direction of xz but with magnitude 1
        result *= v0xz;

        // set magnitude of xz to v0xz (starting speed in xz plane), setting the local Y value
        result -= playerCameraGameObject.transform.InverseTransformDirection (result).y * playerCameraGameObject.transform.up;
        result += playerCameraGameObject.transform.up * v0y;

        return result;
    }

    public void inputThrowObject ()
    {
        if (throwObjectEnabled) {
            throwObject ();
        }
    }

    public void inputInstantiateObject ()
    {
        if (throwObjectEnabled) {
            instantiateObject ();
        }
    }

    public void inputCalculateThrowDirection ()
    {
        if (throwObjectEnabled) {
            calculateThrowDirection ();
        }
    }
}