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

/// <summary>
///
/// </summary>
public class PlayerMotor : MonoBehaviour
{
    ///Attributs
    private const float LANE_DISTANCE = 3.0f;
    private const float TURN_SPEED = 0.05f;

    //
    private bool isRunning = false;
    //Animation
    private Animator anim;

    //Movement
    [SerializeField] CharacterController controller;
    [SerializeField] private   float jumpForce=4.0f;
    [SerializeField] private float gravity = 12.0f;
    [SerializeField] private float verticalVelocity;
    [SerializeField]private float speed = 7.0f;
    [SerializeField] private int desiredLane = 1; //0=Left, 1=Middle,2=Right;

    ///Methods
    private void Start()
    {
        controller = GetComponent<CharacterController>();
        anim = GetComponent<Animator>();
    }
    private void Update()
    {
        if (!isRunning)
            return;
        //Gether the inputs on wich lane we should be
        if (MobileInput.Instance.SwipeLeft)
            MoveLane(false);
        if (MobileInput.Instance.SwipeRight)
            MoveLane(true);

        //Calculate where we should be in the future
        Vector3 targetPosition = transform.position.z * Vector3.forward;
        if (desiredLane == 0)
            targetPosition += Vector3.left * LANE_DISTANCE;
        else if (desiredLane == 2)
            targetPosition += Vector3.right * LANE_DISTANCE;

        //Calculate move delta
        Vector3 moveVector = Vector3.zero;
        moveVector.x = (targetPosition - transform.position).normalized.x * speed;

        bool isVarGrounded = isGrounded();
        anim.SetBool("Grounded", isVarGrounded);
        //Calculate Y
        if (isVarGrounded) //If grounded
        {
            verticalVelocity = -0.1f;

            if (MobileInput.Instance.SwipeUp)
            {
                //Jump
                anim.SetTrigger("Jump");
                verticalVelocity = jumpForce;
            }
            else if(MobileInput.Instance.SwipeDown)
            {
                Debug.Log("SwipeDown");
                //Slide
                //startSliding();
                //Invoke("stopSliding", 0.50f);

            }
        }
        else
        {
            verticalVelocity -= (gravity * Time.deltaTime);
            //Fast falling mechanic
            if (MobileInput.Instance.SwipeDown)
            {
                verticalVelocity = -jumpForce;
            }
        }

        moveVector.y = verticalVelocity;
        moveVector.z = speed;

        //Move the character
        controller.Move(moveVector * Time.deltaTime);

        //Rotate the char the way he is going to
        Vector3 dir = controller.velocity;
        if (dir != Vector3.zero)
        {
            dir.y = 0;
            transform.forward = Vector3.Lerp(transform.forward, dir, TURN_SPEED);
        }

    }


    //Move Left or Right
    private void MoveLane(bool goingRight)
    {
        desiredLane += (goingRight) ? 1 : -1;
        desiredLane = Mathf.Clamp(desiredLane, 0, 2);
    }
    private bool isGrounded()
    {
        Ray groundRay=new Ray(new Vector3(controller.bounds.center.x,(controller.bounds.center.y-controller.bounds.extents.y)+0.2f,controller.bounds.center.z),Vector3.down);
        Debug.DrawRay(groundRay.origin, groundRay.direction, Color.cyan, 1.0f);

        return Physics.Raycast(groundRay, 0.2f + 0.1f);
    }
    public void startRunning()
    {
        isRunning = true;
        anim.SetTrigger("StartRunning");
    }

    private void crash()
    {
        anim.SetTrigger("Death");
        isRunning = false;
    }
    private void OnControllerColliderHit(ControllerColliderHit hit)
    {
        switch(hit.gameObject.tag)
        {
            case "Obstacle":
                crash();
                break;

        }
    }

    private void startSliding()
    {
        anim.SetBool("IsSliding", true);
        controller.height /= 2;
        controller.center = new Vector3(controller.center.x, controller.center.y / 2, controller.center.z);

    }

    private void stopSliding()
    {
        anim.SetBool("IsSliding", false);
        controller.height *= 2;
        controller.center = new Vector3(controller.center.x, controller.center.y * 2, controller.center.z);
    }

}