using System.Collections;
using UnityEngine;
using UnityEngine.InputSystem;

public class PlayerMovement : MonoBehaviour
{
    //Scriptable object which holds all the player's movement parameters. If you don't want to use it
    //just paste in all the parameters, though you will need to manuly change all references in this script

    //HOW TO: to add the scriptable object, right-click in the project window -> create -> Player Data
    //Next, drag it into the slot in playerMovement on your player

    public PlayerData Data;

    #region Variables
    //Components
    public Rigidbody2D RB { get; private set; }

    //Variables control the various actions the player can perform at any time.
    //These are fields which can are public allowing for other sctipts to read them
    //but can only be privately written to.
    public bool IsFacingRight { get; private set; }
    public bool IsJumping { get; private set; }

    //Timers (also all fields, could be private and a method returning a bool could be used)
    public float LastOnGroundTime { get; private set; }

    // trumpet
    public int trumpet = 0;
    public bool in_range = false;
    public GameObject enemy;
    bool unlockedTrumpet;
    [SerializeField] SpriteRenderer trumpetSprite;
    GameObject trumpetAnimationObject;
    bool trumpetActive = false;

    //clarinet
    private float tempFallSpeed;

    //Jump
    private bool _isJumpCut;
    private bool _isJumpFalling;
    private bool isRegFalling;

    private Vector2 _moveInput;
    public float LastPressedJumpTime { get; private set; }

    Tutorial_GrapplingRope grapplingRope;
    bool wasGrappling = false;

    //Set all of these up in the inspector
    [Header("Checks")]
    //Size of groundCheck depends on the size of your character generally you want them slightly small than width (for ground) and height (for the wall check)
    [SerializeField] private Vector2 _groundCheckSize = new Vector2(0.49f, 0.03f);
    [SerializeField] private float _groundCheckOffset;
    [Space(5)]
    [SerializeField] private Vector2 _wallCheckSize = new Vector2(0.5f, 1f);

    [Header("Layers & Tags")]
    [SerializeField] private LayerMask _groundLayer;

    // Static classes
    [HideInInspector] private PlayerBehavior playerBehavior;

    [HideInInspector] private AudioSource audioSource;
    [HideInInspector] private bool soundPlaying = false;

    [HideInInspector] private GameUIController gameUI;
    #endregion

    private void Awake() {
        RB = GetComponent<Rigidbody2D>();
        playerBehavior = this.gameObject.GetComponent<PlayerBehavior>();
        grapplingRope = playerBehavior.grapplingRope;
        audioSource = GetComponent<AudioSource>();
        gameUI = GameObject.FindGameObjectWithTag("GameUICanvas").GetComponent<GameUIController>();
        trumpetSprite.enabled = false;
        trumpetAnimationObject = trumpetSprite.gameObject.transform.GetChild(0).gameObject;
        trumpetAnimationObject.SetActive(false);
    }

    private void Start() {
        SetGravityScale(Data.gravityScale);
        IsFacingRight = true;
        tempFallSpeed = Data.maxFallSpeed;
    }

    void OnMove(InputValue value) {
        if (playerBehavior.playerIsAlive) {
            this._moveInput = value.Get<Vector2>();
        }
        else {
            this._moveInput = Vector2.zero;
        }
    }

    void OnJump() {
        if (playerBehavior.playerIsAlive) {
            OnJumpInput();
        }
    }

    private void Update() {
        unlockedTrumpet = StateController.Instance.HasTrumpet();
        #region TIMERS
        LastOnGroundTime -= Time.deltaTime;

        LastPressedJumpTime -= Time.deltaTime;
        #endregion

        #region COLLISION CHECKS
        if (!IsJumping) {
            //Ground Check
            if (IsGrounded()) {
                //checks if set box overlaps with ground
                LastOnGroundTime = Data.coyoteTime; //if so sets the lastGrounded to coyoteTime
                if (unlockedTrumpet) {
                    trumpet = 1;
                    gameUI.ToggleTrumpet(true);
                }
                else {
                    trumpet = -1;
                }
                wasGrappling = false;
                isRegFalling = false;
            }
            else {
                if (!_isJumpFalling && !isRegFalling) {
                    if (unlockedTrumpet) {
                        trumpet = 1;
                        gameUI.ToggleTrumpet(true);
                    }
                    else {
                        trumpet = -1;
                    }
                    isRegFalling = true;
                }
            }
        }
        #endregion

        #region JUMP CHECKS
        if (IsJumping && RB.velocity.y <= 0) {
            IsJumping = false;
            _isJumpFalling = true;
        }

        if (LastOnGroundTime > 0 && !IsJumping) {
            _isJumpCut = false;

            if (!IsJumping)
                _isJumpFalling = false;
        }


        //Jump
        if (CanJump() && LastPressedJumpTime > 0) {
            IsJumping = true;
            _isJumpCut = false;
            _isJumpFalling = false;

            bool inCoyoteTime = LastOnGroundTime > 0;

            Jump();

            // determine if trumpet jump
            if (!IsGrounded() && in_range && trumpet > 0 && !inCoyoteTime) {
                StartCoroutine(ActivateTrumpetSprite());
                gameObject.transform.Find("Trumpet").GetComponent<AudioSource>().Play();
                enemy.GetComponent<EnemyPatrol>().DefeatEnemy();
                enemy = null;
                in_range = false;
            }
            else if (!IsGrounded() && !in_range && trumpet > 0 && !inCoyoteTime) {
                trumpet -= 1;
            }
            // check if double jump, play sound
            if (trumpet == 0) {
                StartCoroutine(ActivateTrumpetSprite());
                gameObject.transform.Find("Trumpet").GetComponent<AudioSource>().Play();
            }
        }

        // stop sound if needed
        if (soundPlaying && (isRegFalling || IsJumping || _isJumpFalling)) {
            audioSource.Stop();
            soundPlaying = false;
        }
        #endregion

        #region GRAPPLE CHECKS
        // set wasGrappling to true if the player starts grappling
        if (grapplingRope.isGrappling) {
            wasGrappling = true;
        }
        #endregion

        #region GRAVITY
        //Higher gravity if we've released the jump input or are falling
        if (RB.velocity.y < 0 && _moveInput.y < 0) {
            //Much higher gravity if holding down
            SetGravityScale(Data.gravityScale * Data.fastFallGravityMult);
            //Caps maximum fall speed, so when falling over large distances we don't accelerate to insanely high speeds
            RB.velocity = new Vector2(RB.velocity.x, Mathf.Max(RB.velocity.y, -Data.maxFastFallSpeed));
        }
        else if (_isJumpCut) {
            //Higher gravity if jump button released
            SetGravityScale(Data.gravityScale * Data.jumpCutGravityMult);
            RB.velocity = new Vector2(RB.velocity.x, Mathf.Max(RB.velocity.y, -Data.maxFallSpeed));
        }
        else if ((IsJumping || _isJumpFalling) && Mathf.Abs(RB.velocity.y) < Data.jumpHangTimeThreshold) {
            SetGravityScale(Data.gravityScale * Data.jumpHangGravityMult);
        }
        else if (RB.velocity.y < 0) {
            //Higher gravity if falling
            SetGravityScale(Data.gravityScale * Data.fallGravityMult);
            //Caps maximum fall speed, so when falling over large distances we don't accelerate to insanely high speeds
            RB.velocity = new Vector2(RB.velocity.x, Mathf.Max(RB.velocity.y, -Data.maxFallSpeed));
        }
        else {
            //Default gravity if standing on a platform or moving upwards
            SetGravityScale(Data.gravityScale);
        }
        #endregion

        #region SOUND CHECKS
        if (!IsJumping && !_isJumpFalling && !isRegFalling && _moveInput.x != 0) {
            if (!soundPlaying) {
                audioSource.Play();
                soundPlaying = true;
            }
        }
        else if (soundPlaying && audioSource.clip.name == "footsteps") {
            audioSource.Stop();
            soundPlaying = false;
        }
        #endregion

        #region UPDATE UI
        if (trumpet == 0) {
            gameUI.ToggleTrumpet(false);
        }
        #endregion
    }

    private void FixedUpdate() {
        Run(1);
    }

    #region INPUT CALLBACKS
    //Methods which whandle input detected in Update()
    public void OnJumpInput() {
        LastPressedJumpTime = Data.jumpInputBufferTime;
    }

    public void OnJumpUpInput() {
        if (CanJumpCut()) {
            _isJumpCut = true;
        }
    }
    #endregion

    #region GENERAL METHODS
    public void SetGravityScale(float scale) {
        RB.gravityScale = scale;
    }
    #endregion

    //MOVEMENT METHODS
    #region RUN METHODS
    private void Run(float lerpAmount) {
        //Calculate the direction we want to move in and our desired velocity
        float targetSpeed = _moveInput.x * Data.runMaxSpeed;
        //We can reduce are control using Lerp() this smooths changes to are direction and speed
        targetSpeed = Mathf.Lerp(RB.velocity.x, targetSpeed, lerpAmount);

        #region Calculate AccelRate
        float accelRate;

        // accelerate or decelerate
        if (LastOnGroundTime > 0) { // if grounded
            accelRate = (Mathf.Abs(targetSpeed) > 0.01f) ? Data.runAccelAmount : Data.runDeccelAmount;
        }
        else if (wasGrappling) { // if grappling
            accelRate = (Mathf.Abs(targetSpeed) > 0.01f) ? Data.runAccelAmount * Data.accelInAir : Data.runDeccelAmount * (Data.deccelInAir / 5);
        }
        else { // if in air
            accelRate = (Mathf.Abs(targetSpeed) > 0.01f) ? Data.runAccelAmount * Data.accelInAir : Data.runDeccelAmount * Data.deccelInAir;
        }
        #endregion

        #region Add Bonus Jump Apex Acceleration
        //Increase are acceleration and maxSpeed when at the apex of their jump, makes the jump feel a bit more bouncy, responsive and natural
        if ((IsJumping || _isJumpFalling) && Mathf.Abs(RB.velocity.y) < Data.jumpHangTimeThreshold) {
            accelRate *= Data.jumpHangAccelerationMult;
            targetSpeed *= Data.jumpHangMaxSpeedMult;
        }
        #endregion

        #region Conserve Momentum
        //We won't slow the player down if they are moving in their desired direction but at a greater speed than their maxSpeed
        if ((Data.doConserveMomentum && Mathf.Abs(RB.velocity.x) > Mathf.Abs(targetSpeed) && Mathf.Sign(RB.velocity.x) == Mathf.Sign(targetSpeed) && Mathf.Abs(targetSpeed) > 0.01f && LastOnGroundTime < 0) || grapplingRope.isGrappling) {
            //Prevent any deceleration from happening, or in other words conserve are current momentum
            //You could experiment with allowing for the player to slightly increae their speed whilst in this "state"
            accelRate = 0;
        }
        #endregion

        //Calculate difference between current velocity and desired velocity
        float speedDif = targetSpeed - RB.velocity.x;
        //Calculate force along x-axis to apply to thr player

        float movement = speedDif * accelRate;

        //Convert this to a vector and apply to rigidbody
        RB.AddForce(movement * Vector2.right, ForceMode2D.Force);

        /*
         * For those interested here is what AddForce() will do
         * RB.velocity = new Vector2(RB.velocity.x + (Time.fixedDeltaTime  * speedDif * accelRate) / RB.mass, RB.velocity.y);
         * Time.fixedDeltaTime is by default in Unity 0.02 seconds equal to 50 FixedUpdate() calls per second
         */
    }

    private void Turn() {
        //stores scale and flips the player along the x axis, 
        Vector3 scale = transform.localScale;
        scale.x *= -1;
        transform.localScale = scale;

        IsFacingRight = !IsFacingRight;
    }
    #endregion

    #region JUMP METHODS
    private void Jump() {
        //Ensures we can't call Jump multiple times from one press
        LastPressedJumpTime = 0;
        LastOnGroundTime = 0;

        #region Perform Jump
        //We increase the force applied if we are falling
        //This means we'll always feel like we jump the same amount 
        //(setting the player's Y velocity to 0 beforehand will likely work the same, but I find this more elegant :D)
        float force = Data.jumpForce;
        if (RB.velocity.y < 0) {
            force -= RB.velocity.y;
        }
        RB.AddForce(Vector2.up * force, ForceMode2D.Impulse);
        #endregion
    }
    #endregion


    #region CHECK METHODS
    private bool CanJump() {
        if (!IsGrounded() && trumpet > 0) {
            return true;
        }
        return LastOnGroundTime > 0 && !IsJumping;
    }

    private bool CanJumpCut() {
        return IsJumping && RB.velocity.y > 0;
    }

    public bool IsGrounded() {
        return (Physics2D.OverlapBox(new Vector2(this.transform.position.x, this.transform.position.y - _groundCheckOffset), _groundCheckSize, 0, _groundLayer) && !IsJumping);
    }

    public void FloatGravity(float grav) {
        Data.maxFallSpeed = grav;
    }

    public void EndFloatGravity() {
        Data.maxFallSpeed = tempFallSpeed;
    }
    #endregion


    #region EDITOR METHODS
    private void OnDrawGizmosSelected() {
        Gizmos.color = Color.green;
        Gizmos.DrawWireCube(new Vector2(this.transform.position.x, this.transform.position.y - _groundCheckOffset), _groundCheckSize);
        Gizmos.color = Color.blue;
        Gizmos.DrawWireCube(this.transform.position, _wallCheckSize);
        Gizmos.DrawWireCube(this.transform.position, _wallCheckSize);
    }
    #endregion

    #region ADDITIONAL TRUMPET METHODS
    IEnumerator ActivateTrumpetSprite() {
        if (!trumpetActive) {
            trumpetActive = true;
            trumpetSprite.enabled = true;
            trumpetAnimationObject.SetActive(true);
            trumpetAnimationObject.GetComponent<Animator>().Play("poof");
            yield return new WaitForSeconds(.5f);

            trumpetAnimationObject.SetActive(false);
            trumpetSprite.enabled = false;
            trumpetActive = false;
        }
    }
    #endregion

}