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

public class FishController : MonoBehaviour
{
    public float   speed   = 4f;
    public float   gravity = -9.81f;
    public float   jumpSpeed = 8;
    public Vector3 velocity;
    public Vector3 drag;

    CharacterController controller;

    void Start()
    {
        controller = GetComponent<CharacterController>();
    }

    void Update()
    {
        float moveX       = 0 - Input.GetAxisRaw("Vertical");
        float moveZ       = Input.GetAxisRaw("Horizontal");
        float moveGravity = gravity * Time.deltaTime;

        if (controller.isGrounded && velocity.y < 0)
        {
            velocity.y = 0;
        }

        if (Input.GetButtonDown("Jump") && controller.isGrounded)
        {
            velocity.y += jumpSpeed;
        }

        velocity.x = moveX * speed;
        velocity.y += moveGravity;

        transform.Rotate(0, moveZ, 0);

        Vector3 moveVelocity = velocity * Time.deltaTime;

        if (moveVelocity.y < 0 && Math.Abs(moveVelocity.y) < controller.minMoveDistance)
        {
            moveVelocity.y = (gravity * 0.1f) * Time.deltaTime;
        }

        controller.Move(transform.rotation * moveVelocity);
    }
}