using UnityEngine;
using System;
using System.Collections;
using UnityEngine.UI;
using System.Collections.Generic;
using System.Linq;
using TMPro;

[RequireComponent(typeof(Animator))]
public class IKControl : MonoBehaviour
{
    public List<InteractableItem> lookObjs = new List<InteractableItem>();
    public TextMeshProUGUI text;
    public float weightDamping = 1.5f;
    public bool RightHandToTarget = true;
    public float throwSpeed;
    public bool handFinishedMove = false;
    public MoveNavi moveNavi;
    public GameObject descriptionTextImage;
    public GameObject naviParent;
    public DimLights dimLights;
    public Light[] naviLights;
    public bool startMovingNAVI = false;
    public InteractableItem target;
    public bool toTarget = false;
    public bool hasSent = false;
    public GameObject navi;
    public InteractableItem leftHand;

    private List<InteractableItem> allDetectedItems;
    private Animator animator;
    private InteractableItem lastPrimaryTarget;
    private float lerpEndDistance = 0.1f;
    private float finalLookWeight = 0;
    private bool transitionToNextTarget = false;
    private List<string> objectsNames = new List<string>();
    private bool setNaviRotation = false;

    private void Awake()
    {

    }

    void Start()
    {
        animator = GetComponent<Animator>();
        allDetectedItems = new List<InteractableItem>();

        dimLights.lightsToDim = naviLights;
    }

    // Callback for calculating IK
    void OnAnimatorIK()
    {
        if (lookObjs != null)
        {
            lookObjs.RemoveAll(x => x == null);

            InteractableItem primaryTarget = null;

            float closestLookWeight = 0;

            // Here we find the target which is closest (by angle) to the players view line
            allDetectedItems.Clear();
            foreach (InteractableItem target in lookObjs)
            {
                Vector3 lookAt = target.transform.position - transform.position;
                lookAt.y = 0f;

                // Filter out all objects that are too far away
                if (lookAt.magnitude > target.distance) continue;

                float dotProduct = Vector3.Dot(new Vector3(transform.forward.x, 0f, transform.forward.z).normalized, lookAt.normalized);
                float lookWeight = Mathf.Clamp(dotProduct, 0f, 1f);
                if (lookWeight > 0.1f && lookWeight > closestLookWeight)
                {
                    closestLookWeight = lookWeight;
                    primaryTarget = target;
                }

                allDetectedItems.Add(target);
            }

            if (allDetectedItems.Count == 2)
            {
                objectsNames = allDetectedItems.Select(item => item.transform.name).ToList();
                if (objectsNames.Contains("NAVI") && objectsNames.Contains("Security Keypad Interactable"))
                {
                    InteractableItem navi = allDetectedItems.Single(item => item.transform.name == "NAVI");
                    InteractableItem securitykeypad = allDetectedItems.Single(item => item.transform.name == "Security Keypad Interactable");
                    var crate = GameObject.Find("Crate_0_0");

                    if (crate.gameObject.GetComponent<UnlockCrate>().HasOpened())
                    {
                        primaryTarget = navi;
                        target = primaryTarget;
                        startMovingNAVI = true;
                    }
                    else
                    {
                        primaryTarget = securitykeypad;
                    }
                }
            }

            InteractWithTarget(primaryTarget, closestLookWeight);
        }
    }

    private void InteractWithTarget(InteractableItem primaryTarget, float closestLookWeight)
    {
        if (primaryTarget != null)
        {
            if ((lastPrimaryTarget != null) && (lastPrimaryTarget != primaryTarget) && (finalLookWeight > 0f))
            {
                // Here we start a new transition because the player looks already to a target but
                // we have found another target the player should look at
                transitionToNextTarget = true;
            }
        }

        // The player is in a neutral look position but has found a new target
        if ((primaryTarget != null) && !transitionToNextTarget)
        {
            if (primaryTarget.IsAnyAction())
            {
                RightHandToTarget = true;
            }

            lastPrimaryTarget = primaryTarget;
            finalLookWeight = Mathf.Lerp(finalLookWeight, 1f, Time.deltaTime * weightDamping);
            float bodyWeight = finalLookWeight * .1f;
            animator.SetLookAtWeight(finalLookWeight, bodyWeight, 1f);
            animator.SetLookAtPosition(primaryTarget.transform.position);

            if (RightHandToTarget && primaryTarget.IsAnyAction())
            {
                Vector3 relativePos = primaryTarget.transform.position - transform.position;
                Quaternion rotationtoTarget = Quaternion.LookRotation(relativePos, Vector3.up);

                if (primaryTarget.interactableMode == InteractableItem.InteractableMode.ActionWithoutThrow)
                {
                    animator.SetIKRotationWeight(AvatarIKGoal.RightHand, finalLookWeight);
                    animator.SetIKRotation(AvatarIKGoal.RightHand, rotationtoTarget);
                    animator.SetIKPositionWeight(AvatarIKGoal.RightHand, finalLookWeight * 1f * closestLookWeight);
                    animator.SetIKPosition(AvatarIKGoal.RightHand, primaryTarget.transform.position);
                }

                if (primaryTarget.interactableMode == InteractableItem.InteractableMode.Action)
                {
                    animator.SetIKRotationWeight(AvatarIKGoal.RightHand, finalLookWeight);
                    animator.SetIKRotation(AvatarIKGoal.RightHand, rotationtoTarget);
                    animator.SetIKPositionWeight(AvatarIKGoal.RightHand, finalLookWeight * 0.1f * closestLookWeight);
                    animator.SetIKPosition(AvatarIKGoal.RightHand, primaryTarget.transform.position);
                }

                // -> new code block
                if (finalLookWeight > 0.95f) // here you can play with a value between 0.95f -> 1.0f
                {
                    if (primaryTarget.interactableMode == InteractableItem.InteractableMode.Action
                        && hasSent == false)
                    {
                        target = primaryTarget;
                        toTarget = true;
                        hasSent = true;
                        primaryTarget.description = "";
                        // Here I need to find where to make hasSent false again.
                    }
                }
                else
                {
                    hasSent = false;
                }

                if (finalLookWeight > 0.9f)
                {
                    handFinishedMove = true;
                }
            }
        }

        // Let the player smoothly look away from the last target to the neutral look position
        if ((primaryTarget == null && lastPrimaryTarget != null) || transitionToNextTarget)
        {
            finalLookWeight = Mathf.Lerp(finalLookWeight, 0f, Time.deltaTime * weightDamping);
            float bodyWeight = finalLookWeight * .75f;
            animator.SetLookAtWeight(finalLookWeight, bodyWeight, 1f);
            animator.SetLookAtPosition(lastPrimaryTarget.transform.position);

            if (RightHandToTarget)
            {
                Vector3 relativePos = lastPrimaryTarget.transform.position - transform.position;
                Quaternion rotationtoTarget = Quaternion.LookRotation(relativePos, Vector3.up);
                animator.SetIKRotationWeight(AvatarIKGoal.RightHand, finalLookWeight);
                animator.SetIKRotation(AvatarIKGoal.RightHand, rotationtoTarget);
                animator.SetIKPositionWeight(AvatarIKGoal.RightHand, finalLookWeight * 0.5f * closestLookWeight);
                animator.SetIKPosition(AvatarIKGoal.RightHand, lastPrimaryTarget.transform.position);
            }

            if (finalLookWeight < lerpEndDistance)
            {
                transitionToNextTarget = false;
                finalLookWeight = 0f;
                lastPrimaryTarget = null;
                transform.rotation = Quaternion.Euler(0, transform.eulerAngles.y, 0);
            }
        }

        // Show primary object found by the player
        if (primaryTarget != null)
        {
            if (primaryTarget.description != "")
            {
                descriptionTextImage.SetActive(true);
                text.text = primaryTarget.description;
            }
        }
        else
        {
            text.text = "";
            descriptionTextImage.SetActive(false);
        }
    }

    private void Update()
    {
        if(MenuController.LoadSceneForSavedGame == true && setNaviRotation == false)
        {
            transform.rotation = Quaternion.Euler(0, transform.eulerAngles.y, 0);
            setNaviRotation = true;
        }
    }
}