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

public class ShipPathFollower : MonoBehaviour, ITextChangable
{
    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;

    public float cutsceneSpeed = 50f;

    [SerializeField]
    private 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 UnityEvent<object> OnTextChange => _OnTextChange;
    private UnityEvent<object> _OnTextChange = new UnityEvent<object>();

    public UnityEvent<float> OnSpeedChange;
    public UnityEvent<float> OnSpeedPercentChange;
    public UnityEvent<float> OnBoostPercentChange;

    public float SpeedPercent;

    private float _boostSpeed;
    [SerializeField]
    private float _boostBreakSpeed;
    private PlayerInputHandler playerInput;

    public bool IsBot = false;
    // Update is called once per frame

    private void Start()
    {
        playerInput = GetComponent<PlayerInputHandler>();
    }

    void Update()
    {
        if (_isCutsceneMovement)
            return;

        if (!IsBot && playerInput.Boost)
        {
            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);

        _boostSpeed -= Time.deltaTime * _boostBreakSpeed;
        _boostSpeed = Mathf.Clamp(_boostSpeed, 0, float.MaxValue);

        speed = Mathf.Clamp(speed, minSpeed, maxSpeed + _boostSpeed);
        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);
        
        _OnTextChange?.Invoke((int)speed);
        OnSpeedChange?.Invoke(speed);
        OnSpeedPercentChange?.Invoke(SpeedPercent);
    }

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

    public UnityEvent OnBreak;

    public void FastBreak(float multiplier)
    {
        speed *= multiplier;
        OnBreak?.Invoke();
        
    }

    public void FastBoost(float value)
    {
        _boostSpeed = value;
        speed += _boostSpeed;
    }

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

    public void ChangeMaxSpeed(float newSpeed)
    {
        maxSpeed = newSpeed;
    }

    public void AddForce(float amount)
    {
        addForce = amount;
    }

    private bool _isCutsceneMovement = false;

    public void CutsceneMovement()
    {
        _isCutsceneMovement = true;
        speed = cutsceneSpeed;
    }
}