using UnityEngine;
using UnityEngine.Events;

public class CharacterController2D : MonoBehaviour {
    [SerializeField] private float m_JumpForce = 50f;                           // Amount of force added when the player jumps.
    [Range(0, .3f)] [SerializeField] private float m_RunSmoothing = .15f;  // How much to smooth out the movement
    [Range(0, .3f)] [SerializeField] private float m_DashSmoothing = .3f;  // How much to smooth out the movement
    [SerializeField] private bool m_AirControl = false;                         // Whether or not a player can steer while jumping;
    [SerializeField] public LayerMask m_WhatIsGround;                          // A mask determining what is ground to the character
    [SerializeField] private Vector3 m_halfExtents;
    [SerializeField] public Transform m_GroundCheckBottom;                           // A position marking where to check if the player is grounded.
    [SerializeField] public Transform m_GroundCheckTop;                           // A position marking where to check if the player is grounded.
    public bool m_Grounded;            // Whether or not the player is grounded.
    public float maxDropSpeed = 100f;
    public float maxHorizontalSpeed = 100f;
    public Rigidbody2D m_Rigidbody2D;
    public PlayerMovement m_PlayerMovement;
    public AudioSource audioSource;
    public AudioClip audioClipLand;
    public AudioClip audioClipJump;
    public AudioClip audioClipDoubleJump;
    public AudioClip audioClipWallKick;
    public AudioClip audioClipDash;
    public AudioClip audioClipDashStart;
    public AudioClip audioClipBlowback;
    public AudioClip audioClipAttack;
    public AudioClip audioClipFootstep1;
    public AudioClip audioClipFootstep2;
    public AudioClip audioClipExecutionCharge;
    public AudioClip audioClipExecution;
    public AudioClip audioClipArrowBarrageCharge;
    public AudioClip audioClipPickup;
    public AudioClip audioClipCraft;
    public AudioClip audioClipCraftFail;
    public AudioClip audioClipLevelUp;

    public float volume = 0.5f;
    public bool m_FacingRight = true;  // For determining which way the player is currently facing.
    private Vector3 m_Velocity = Vector3.zero;

    public float lowGravity = 2;
    public float highGravity = 5;

    [Header("Events")]
    [Space]

    public UnityEvent OnLandEvent;

    [System.Serializable]
    public class BoolEvent : UnityEvent<bool> { }

    private void Awake() {
        m_Rigidbody2D = GetComponent<Rigidbody2D>();

        if (OnLandEvent == null)
            OnLandEvent = new UnityEvent();

        State.state.quests.RefreshAvailableQuests();
    }

    private void FixedUpdate() {
        bool wasGrounded = m_Grounded;
        m_Grounded = false;

        // The player is grounded if a circlecast to the groundcheck position hits anything designated as ground
        // This can be done using layers instead but Sample Assets will not overwrite your project settings.
        // Collider2D[] colliders = Physics2D.OverlapCircleAll(m_GroundCheck.position, k_GroundedRadius, m_WhatIsGround);
        // Bottom ground check must touch. Top ground check (slightly above bottom of hitbox) must not touch.
        Collider2D[] collidersBottom = Physics2D.OverlapBoxAll(m_GroundCheckBottom.position, m_halfExtents, 0, m_WhatIsGround);
        Collider2D[] collidersTop = Physics2D.OverlapBoxAll(m_GroundCheckTop.position, m_halfExtents, 0, m_WhatIsGround);
        bool collidedBottom = false, collidedTop = false;
        if (m_Rigidbody2D.velocity.y <= 1) {
            for (int i = 0; i < collidersBottom.Length; i++) {
                if (collidersBottom[i].gameObject != gameObject) {
                    collidedBottom = true;
                }
            }
            for (int i = 0; i < collidersTop.Length; i++) {
                if (collidersTop[i].gameObject != gameObject) {
                    collidedTop = true;
                }
            }
            if (collidedBottom && !collidedTop) {
                m_Grounded = true;
                if (!wasGrounded) {
                    Debug.Log("Land");
                    OnLandEvent.Invoke();
                }
            }
        }
    }


    public void Move(float move, bool jump, bool dash = false) {

        // Only control the player if grounded or airControl is turned on
        if (m_Grounded || m_AirControl) {
            float intendedSpeed = move * 10f;
            bool shouldControlVelocity = true;
            // If the player is in the air and has already passed the max natural speed in that direction,
            // don't slow them down.
            if (!m_Grounded && m_AirControl &&
                (move > 0f) == (m_Rigidbody2D.velocity.x > 0f) &&
                (move < 0f) == (m_Rigidbody2D.velocity.x < 0f) &&
                Mathf.Abs(m_Rigidbody2D.velocity.x) > Mathf.Abs(intendedSpeed)) {
                shouldControlVelocity = false;
            }
            // Blowback Shot and wall-kicking negate air control.
            if (!m_Grounded && (m_PlayerMovement.alreadyBlowbackShot || m_PlayerMovement.alreadyKicked)) {
                shouldControlVelocity = false;
            }
            Vector3 newVelocity = m_Rigidbody2D.velocity;
            if (shouldControlVelocity) {
                // Move the character by finding the target velocity
                Vector3 targetVelocity = new Vector2(intendedSpeed, m_Rigidbody2D.velocity.y);
                // And then smoothing it out and applying it to the character
                if (dash) {
                    newVelocity = Vector3.SmoothDamp(m_Rigidbody2D.velocity, targetVelocity, ref m_Velocity, m_DashSmoothing);
                } else {
                    newVelocity = Vector3.SmoothDamp(m_Rigidbody2D.velocity, targetVelocity, ref m_Velocity, m_RunSmoothing);
                }

                // If the input is moving the player right and the player is facing left...
                if (move > 0 && !m_FacingRight) {
                    // ... flip the player.
                    Flip();
                }
                // Otherwise if the input is moving the player left and the player is facing right...
                else if (move < 0 && m_FacingRight) {
                    // ... flip the player.
                    Flip();
                }
            }
            newVelocity.y = Mathf.Max(m_Rigidbody2D.velocity.y, maxDropSpeed);
            m_Rigidbody2D.velocity = newVelocity;
        }
        // Add force at the start of your jump.
        if (m_Grounded && jump) {
            m_Grounded = false;
            m_Rigidbody2D.velocity = new Vector2(m_Rigidbody2D.velocity.x,
                m_Rigidbody2D.velocity.y + 2.0f);
            m_Rigidbody2D.AddForce(new Vector2(0f, m_JumpForce));
            PlaySound(audioClipJump);
        }

        m_Rigidbody2D.velocity = new Vector2(
            Mathf.Max(Mathf.Min(m_Rigidbody2D.velocity.x, maxHorizontalSpeed), -1f * maxHorizontalSpeed),
            m_Rigidbody2D.velocity.y);
    }


    public void Flip() {
        // Switch the way the player is labelled as facing.
        m_FacingRight = !m_FacingRight;

        // Multiply the player's x local scale by -1.
        Vector3 scale = transform.localScale;
        scale.x *= -1;
        transform.localScale = scale;
    }

    public void PlaySound(AudioClip clip) {
        audioSource.PlayOneShot(clip, volume);
    }
}