using Dreamteck.Splines;
using PathCreation;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.InputSystem;

public class ShipPathFollower : MonoBehaviour
{
    public float speed = 10f;
    public float minSpeed = 1f;
    public float maxSpeed = 20f;
    public float frictionForce = 0.1f;
    public float gravityForce = 1f;
    public float slopeRange = 60f;
    SplineFollower follower;
    public AnimationCurve speedGain;
    public AnimationCurve speedLoss;
    public float brakeSpeed = 0f;
    public float brakeReleaseSpeed = 0f;

    private float brakeTime = 0f;
    private float brakeForce = 0f;
    private float addForce = 0f;

    public float soundFadeLength = 0.15f;

    public event UnityAction<float> OnSpeedChange;

    public InputActionReference LeftTrigger;
    public InputActionReference RightTrigger;
    // Use this for initialization
    void Start()
    {
        follower = GetComponent<SplineFollower>();
    }


    // Update is called once per frame
    void Update()
    {
        if (Input.GetKey(KeyCode.W) || RightTrigger.action.inProgress && LeftTrigger.action.inProgress)
        {
            AddForce(1);
        }

        float dot = Vector3.Dot(this.transform.forward, Vector3.down);
        float dotPercent = Mathf.Lerp(-slopeRange / 90f, slopeRange / 90f, (dot + 1f) / 2f);
        speed -= Time.deltaTime * frictionForce * (1f - brakeForce);
        float speedAdd = 0f;
        float speedPercent = Mathf.InverseLerp(minSpeed, maxSpeed, speed);
        if (dotPercent > 0f)
        {
            speedAdd = gravityForce * dotPercent * speedGain.Evaluate(speedPercent) * Time.deltaTime;
        }
        else
        {
            speedAdd = gravityForce * dotPercent * speedLoss.Evaluate(1f - speedPercent) * Time.deltaTime;
        }
        speed += speedAdd * (1f - brakeForce);
        speed = Mathf.Clamp(speed, minSpeed, maxSpeed);
        if (addForce > 0f)
        {
            float lastAdd = addForce;
            addForce = Mathf.MoveTowards(addForce, 0f, Time.deltaTime * 30f);
            speed += lastAdd - addForce;
        }
        follower.followSpeed = speed;
        follower.followSpeed *= (1f - brakeForce);
        if (brakeTime > Time.time) brakeForce = Mathf.MoveTowards(brakeForce, 1f, Time.deltaTime * brakeSpeed);
        else brakeForce = Mathf.MoveTowards(brakeForce, 0f, Time.deltaTime * brakeReleaseSpeed);

        speedPercent = Mathf.Clamp01(speed / maxSpeed) * (1f - brakeForce);
        OnSpeedChange?.Invoke(speed);
    }

    public void AddBrake(float time)
    {
        brakeTime = Time.time + time;
    }

    public void RemoveBrake()
    {
        brakeTime = 0f;
    }

    public void AddForce(float amount)
    {
        addForce = amount;
        addForce *= RightTrigger.action.ReadValue<float>() * LeftTrigger.action.ReadValue<float>();
    }
}