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

public class handsOnMeleeWeaponIKSystem : OnAnimatorIKComponent
{
    [Header ("Main Settings")]
    [Space]

    public bool adjustHandsEnabled = true;

    public float weightLerpSpeed = 6;

    public float busyBodyPartWeightLerpSpeed = 3;

    public float minWaitTimeToActiveHands = 0.3f;

    [Space]
    [Header ("Hands Info List Settings")]
    [Space]

    public List<handInfo> handInfoList = new List<handInfo> ();

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

    public bool showDebugPrint;
    public bool handsOnMeleeActive;

    public bool usingHands;

    public bool isBusy;

    public bool adjustHandsPaused;

    public bool smoothBusyDisableActive;

    public bool handsCheckPausedWithDelayActive;

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

    public bool useEventsOnActiveStateChange;
    public UnityEvent eventOnActive;
    public UnityEvent eventOnDeactivate;

    [Space]
    [Header ("Component Elements")]
    [Space]

    public Animator animator;
    public IKSystem IKManager;
    public playerController playerControllerManager;
    public meleeWeaponsGrabbedManager mainMeleeWeaponsGrabbedManager;

    handInfo currentHandInfo;

    bool isThirdPersonView;

    float originalWeightLerpSpeed;

    float currentWeightToApply;

    AvatarIKGoal currentIKGoal;

    int handInfoListCount;

    float minIKValue = 0.001f;

    Coroutine delayToResumeStateCoroutine;

    bool valuesInitialized;

    float lastTimeHandsActive = 0;

    float currentWeightLerpSpeed;


    public override void updateOnAnimatorIKState ()
    {
        if (handsOnMeleeActive) {
            isThirdPersonView = !playerControllerManager.isPlayerOnFirstPerson ();

            usingHands = IKManager.getUsingHands ();

            if (IKManager.isObjectGrabbed ()) {
                usingHands = false;
            }

            isBusy = playerIsBusy ();

            if (Time.time < lastTimeHandsActive + minWaitTimeToActiveHands) {
                isBusy = true;
            }

            bool IKBodyPaused = IKManager.isIKBodyPaused ();

            bool pauseIKBodyResult = playerControllerManager.isActionActive () ||
                                     mainMeleeWeaponsGrabbedManager.isAimingBowActive () ||
                                     mainMeleeWeaponsGrabbedManager.isCuttingModeActive ();

            if (!isBusy || smoothBusyDisableActive) {

                for (int j = 0; j < handInfoListCount; j++) {

                    currentHandInfo = handInfoList [j];

                    if (currentHandInfo.IKBodyPartEnabled) {
                        if (IKBodyPaused || pauseIKBodyResult) {
                            if (!currentHandInfo.bodyPartBusy) {
                                currentHandInfo.bodyPartBusy = true;
                                currentHandInfo.IKBodyWeigthTarget = 0;
                            }
                        } else {

                            if (!usingHands) {
                                if (currentHandInfo.bodyPartBusy) {
                                    currentHandInfo.bodyPartBusy = false;
                                    currentHandInfo.IKBodyWeigthTarget = 1;
                                } else {
                                    currentHandInfo.IKBodyWeigthTarget = 1;
                                }
                            } else {
                                if (!currentHandInfo.bodyPartBusy) {
                                    currentHandInfo.bodyPartBusy = true;
                                    currentHandInfo.IKBodyWeigthTarget = 0;
                                }
                            }
                        }

                        if (currentHandInfo.currentIKWeight != currentHandInfo.IKBodyWeigthTarget) {

                            if (currentHandInfo.bodyPartBusy) {
                                currentWeightLerpSpeed = busyBodyPartWeightLerpSpeed;
                            } else {
                                currentWeightLerpSpeed = weightLerpSpeed;
                            }

                            currentHandInfo.currentIKWeight = Mathf.MoveTowards (currentHandInfo.currentIKWeight,
                                currentHandInfo.IKBodyWeigthTarget, Time.fixedDeltaTime * currentWeightLerpSpeed);
                        }

                        bool applyIKToBodyPart = false;

                        if (!currentHandInfo.bodyPartBusy) {

                            currentHandInfo.IKGoalPosition = currentHandInfo.targetToFollow.position;
                            currentHandInfo.IKGoalRotation = currentHandInfo.targetToFollow.rotation;

                            applyIKToBodyPart = true;

                        } else if (currentHandInfo.currentIKWeight != currentHandInfo.IKBodyWeigthTarget) {
                            applyIKToBodyPart = true;
                        }

                        if (applyIKToBodyPart) {

                            currentWeightToApply = currentHandInfo.currentIKWeight;

                            if (currentWeightToApply > minIKValue) {
                                currentIKGoal = currentHandInfo.IKGoal;

                                animator.SetIKRotationWeight (currentIKGoal, currentWeightToApply);
                                animator.SetIKPositionWeight (currentIKGoal, currentWeightToApply);
                                animator.SetIKPosition (currentIKGoal, currentHandInfo.IKGoalPosition);
                                animator.SetIKRotation (currentIKGoal, currentHandInfo.IKGoalRotation);
                            }
                        }
                    }
                }
            } else {
                for (int j = 0; j < handInfoListCount; j++) {

                    currentHandInfo = handInfoList [j];

                    currentHandInfo.bodyPartBusy = false;

                    currentHandInfo.IKBodyWeigthTarget = 0;

                    currentHandInfo.currentIKWeight = 0;
                }
            }
        }
    }

    public bool playerIsBusy ()
    {
        return

            (usingHands && !IKManager.isObjectGrabbed ()) ||
        !isThirdPersonView ||
        playerControllerManager.isPlayerOnFFOrZeroGravityModeOn () ||
        playerControllerManager.isUsingCloseCombatActive () ||
        playerControllerManager.isPlayerDead () ||
        adjustHandsPaused ||
        playerControllerManager.isUsingJetpack () ||
        playerControllerManager.isFlyingActive () ||
        playerControllerManager.isSwimModeActive ();
    }

    public void setWeightLerpSpeedValue (float newValue)
    {
        weightLerpSpeed = newValue;
    }

    public void setOriginalWeightLerpSpeed ()
    {
        setWeightLerpSpeedValue (originalWeightLerpSpeed);
    }

    public void setAdjustHandsPausedState (bool state)
    {
        adjustHandsPaused = state;
    }

    public void setSmoothBusyDisableActiveState (bool state)
    {
        smoothBusyDisableActive = state;
    }

    public void setAdjustHandsEnabledState (bool state)
    {
        adjustHandsEnabled = state;
    }


    public void enableHandsCheckPausedWithDelayActive (float duration)
    {
        stopUpdateDelayToResumeStateCoroutine ();

        delayToResumeStateCoroutine = StartCoroutine (updateDelayToResumeStateCoroutine (duration));
    }

    public void stopUpdateDelayToResumeStateCoroutine ()
    {
        if (delayToResumeStateCoroutine != null) {
            StopCoroutine (delayToResumeStateCoroutine);
        }

        handsCheckPausedWithDelayActive = false;
    }

    IEnumerator updateDelayToResumeStateCoroutine (float duration)
    {
        handsCheckPausedWithDelayActive = true;

        WaitForSeconds delay = new WaitForSeconds (duration);

        yield return delay;

        handsCheckPausedWithDelayActive = false;
    }

    public override void enableBothHands ()
    {
        enableOrDisableRightOrLeftHand (true, false, true);
    }

    public override void enableOnlyLeftHand ()
    {
        enableOrDisableRightOrLeftHand (true, false, false);
    }

    public override void enableOnlyRightHand ()
    {
        enableOrDisableRightOrLeftHand (true, true, false);
    }

    public override void enableOrDisableRightOrLeftHand (bool state, bool isRightHand, bool setStateOnBothHands)
    {
        if (showDebugPrint) {
            print (state + " " + isRightHand + " " + setStateOnBothHands);
        }

        handInfoListCount = handInfoList.Count;

        for (int j = 0; j < handInfoListCount; j++) {

            currentHandInfo = handInfoList [j];

            if (setStateOnBothHands) {
                currentHandInfo.IKBodyPartEnabled = state;
            } else {
                if (currentHandInfo.isRightHand) {
                    if (isRightHand) {
                        currentHandInfo.IKBodyPartEnabled = state;
                    } else {
                        currentHandInfo.IKBodyPartEnabled = false;

                        currentHandInfo.bodyPartBusy = false;

                        currentHandInfo.IKBodyWeigthTarget = 0;

                        currentHandInfo.currentIKWeight = 0;
                    }
                } else {
                    if (isRightHand) {
                        currentHandInfo.IKBodyPartEnabled = false;

                        currentHandInfo.bodyPartBusy = false;

                        currentHandInfo.IKBodyWeigthTarget = 0;

                        currentHandInfo.currentIKWeight = 0;
                    } else {
                        currentHandInfo.IKBodyPartEnabled = state;
                    }
                }
            }

            bool checkEnableEventsResult = currentHandInfo.IKBodyPartEnabled;

            if (currentHandInfo.useEventOnIKPartEnabledStateChange) {
                if (checkEnableEventsResult) {
                    currentHandInfo.eventOnIKPartEnabled.Invoke ();
                } else {
                    currentHandInfo.eventOnIKPartDisabled.Invoke ();
                }
            }

            if (showDebugPrint) {
                print (currentHandInfo.Name + " " + checkEnableEventsResult + " " + currentHandInfo.bodyPartBusy);
            }
        }

        if (showDebugPrint) {
            for (int j = 0; j < handInfoListCount; j++) {

                currentHandInfo = handInfoList [j];

                print (currentHandInfo.isRightHand + " " + currentHandInfo.IKBodyPartEnabled);
            }
        }
    }

    public override void setActiveState (bool state)
    {
        if (!adjustHandsEnabled) {
            return;
        }

        if (handsOnMeleeActive == state) {
            return;
        }

        handsOnMeleeActive = state;

        if (handsOnMeleeActive) {
            if (!valuesInitialized) {
                originalWeightLerpSpeed = weightLerpSpeed;

                handInfoListCount = handInfoList.Count;

                valuesInitialized = true;
            }

            lastTimeHandsActive = Time.time;
        } else {
            for (int j = 0; j < handInfoListCount; j++) {

                currentHandInfo = handInfoList [j];

                currentHandInfo.bodyPartBusy = false;

                currentHandInfo.IKBodyWeigthTarget = 0;

                currentHandInfo.currentIKWeight = 0;
            }
        }

        if (useEventsOnActiveStateChange) {
            if (state) {
                eventOnActive.Invoke ();
            } else {
                eventOnDeactivate.Invoke ();
            }
        }
    }

    public void disableStateIfNotCurrentlyActiveOnIKSystem ()
    {
        if (handsOnMeleeActive) {
            if (!IKManager.checkIfTemporalOnAnimatorIKComponentIfIsCurrent (this)) {
                setActiveState (false);
            }
        }
    }

    //EDITOR FUNCTIONS
    public void setAdjustHandsEnabledStateFromEditor (bool state)
    {
        setAdjustHandsEnabledState (state);

        updateComponent ();
    }

    void updateComponent ()
    {
        GKC_Utils.updateComponent (this);
    }

    [System.Serializable]
    public class handInfo
    {
        [Header ("Main Settings")]
        [Space]

        public string Name;
        public bool IKBodyPartEnabled = true;

        public bool isRightHand;

        public Transform targetToFollow;

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

        public AvatarIKGoal IKGoal;

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

        public bool bodyPartBusy;

        public float currentIKWeight;
        public float IKBodyWeigthTarget;

        [HideInInspector] public Vector3 IKGoalPosition;
        [HideInInspector] public Quaternion IKGoalRotation;

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

        public bool useEventOnIKPartEnabledStateChange;
        public UnityEvent eventOnIKPartEnabled;
        public UnityEvent eventOnIKPartDisabled;
    }
}