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

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

    public bool checkCollisionsEnabled = true;

    public bool removeComponentOnCollisionEnabled = true;

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

    public bool useCustomDamageAmount;
    public float customDamageAmount;

    public bool searchPlayerAsDamageAttacker;

    public int damageTypeID = -1;

    public bool damageCanBeBlocked = true;

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

    public bool checkOnTriggerEnterEnabled;

    public LayerMask layermaskToCheckOnTriggerEnter;

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

    public bool useRemoteEventOnObjectsFound;
    public List<string> remoteEventNameList = new List<string> ();


    bool ignoreShield;
    bool canActivateReactionSystemTemporally;
    int damageReactionID = -1;

    float timer = 0;
    GameObject currentPlayer;
    Collider currentPlayerCollider;
    Collider mainCollider;


    //this script is for the objects launched by the player, to check the object which collides with them

    void Update ()
    {
        if (!checkCollisionsEnabled) {
            return;
        }

        //if the launched objects does not collide with other object, remove the script
        if (timer > 0) {
            timer -= Time.deltaTime;

            if (timer < 0) {
                activateCollision ();
            }
        }
    }

    void OnCollisionEnter (Collision collision)
    {
        if (!checkCollisionsEnabled) {
            return;
        }

        checkObjectDetected (collision.collider, collision.relativeVelocity.magnitude, collision.contacts [0].point, false);
    }
    public void setOnTriggerInfoCheckState (bool state, LayerMask newLayermask)
    {
        checkOnTriggerEnterEnabled = state;

        layermaskToCheckOnTriggerEnter = newLayermask;
    }

    void OnTriggerEnter (Collider colliderDetected)
    {
        if (!checkCollisionsEnabled) {
            return;
        }

        if (checkOnTriggerEnterEnabled) {
            if ((1 << colliderDetected.gameObject.layer & layermaskToCheckOnTriggerEnter.value) != 1 << colliderDetected.gameObject.layer) {
                return;
            }

            checkObjectDetected (colliderDetected, GetComponent<Rigidbody> ().linearVelocity.magnitude, transform.position, true);
        }
    }

    public void setUseCustomDamageAmountValues (bool state, float amount)
    {
        useCustomDamageAmount = state;

        customDamageAmount = amount;
    }
    void checkObjectDetected (Collider colliderDetected, float collisionVelocity, Vector3 collisionPosition, bool checkIfIsTrigger)
    {
        if (!colliderDetected.isTrigger || checkIfIsTrigger) {
            //if the object has a health script, it reduces the amount of life according to the launched object velocity
            float damageAmountToUse = 0;

            if (useCustomDamageAmount) {
                damageAmountToUse = customDamageAmount;
            } else {
                damageAmountToUse = GetComponent<Rigidbody> ().linearVelocity.magnitude;

                if (damageAmountToUse == 0) {
                    damageAmountToUse = collisionVelocity;
                }
            }

            GameObject currentObjectFound = colliderDetected.gameObject;

            bool objectToDamageFound = applyDamage.objectCanBeDamaged (currentObjectFound);

            if (objectToDamageFound) {

                if (searchPlayerAsDamageAttacker && currentPlayer == null) {
                    currentPlayer = GKC_Utils.findMainPlayerOnScene ();
                }

                if (damageAmountToUse > 0) {
                    applyDamage.checkHealth (gameObject, currentObjectFound, damageAmountToUse, -transform.forward, transform.position, currentPlayer,
                        false, true, ignoreShield, false, damageCanBeBlocked, canActivateReactionSystemTemporally, damageReactionID, damageTypeID);
                }

                bool isVehicle = applyDamage.isVehicle (currentObjectFound);

                if (isVehicle) {
                    Rigidbody objectToDamageMainRigidbody = applyDamage.applyForce (currentObjectFound);

                    if (objectToDamageMainRigidbody != null) {
                        Vector3 collisionDirection = (collisionPosition - transform.position).normalized;

                        objectToDamageMainRigidbody.AddForce (collisionDirection * damageAmountToUse * objectToDamageMainRigidbody.mass, ForceMode.Impulse);
                    }
                }

                activateCollision ();

                if (currentObjectFound != null) {
                    if (useRemoteEventOnObjectsFound) {
                        remoteEventSystem currentRemoteEventSystem = currentObjectFound.GetComponent<remoteEventSystem> ();

                        if (currentRemoteEventSystem != null) {
                            for (int i = 0; i < remoteEventNameList.Count; i++) {
                                currentRemoteEventSystem.callRemoteEvent (remoteEventNameList [i]);
                            }
                        }
                    }
                }
            }
            //else, set the timer to disable the script
            else {
                timer = 1;
            }
        }
    }

    void activateCollision ()
    {
        if (currentPlayerCollider != null) {

            mainCollider = GetComponent<Collider> ();

            if (mainCollider != null) {
                Physics.IgnoreCollision (mainCollider, currentPlayerCollider, false);
            }
        }

        if (removeComponentOnCollisionEnabled) {
            Destroy (this);
        }
    }

    public void setCurrentPlayer (GameObject player)
    {
        currentPlayer = player;
    }

    public void setCurrentPlayerAndCollider (GameObject player, Collider playerCollider)
    {
        currentPlayer = player;

        currentPlayerCollider = playerCollider;
    }

    public void setIgnoreShieldState (bool state)
    {
        ignoreShield = state;
    }

    public void setCanActivateReactionSystemTemporally (bool state)
    {
        canActivateReactionSystemTemporally = state;
    }

    public void setCamageReactionID (int newValue)
    {
        damageReactionID = newValue;
    }

    public void setCheckCollisionsEnabledState (bool state)
    {
        checkCollisionsEnabled = state;
    }
}