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

public class BoatController : BuoyantObject {

    public float trunSpeed = 0.5f;
    public float breakSpeed = 20f;
    [Range(0.8f,1)]
    public float stopRatio = 0.95f;

    private bool applyBreak = true;


    // Use this for initialization
    void Start() {

    }

    void Update() {
        lookAtDir(Vector3.ProjectOnPlane(rb.velocity, Vector3.up));
    }

    void FixedUpdate() {

        doBreak();
    }

    // Update is called once per frame
    void lookAtDir(Vector3 inputDir) {
        Quaternion targetRotation = Quaternion.LookRotation(inputDir, Vector3.up);
        float str = Mathf.Min(trunSpeed * Time.deltaTime, 1);
        transform.rotation = Quaternion.Lerp(transform.rotation, targetRotation, str);
    }

    void OnCollisionEnter(Collision collision) {
        if (collision.gameObject.CompareTag("Rock")) {

            float forwardHitSpeed = Vector3.Project(collision.relativeVelocity, transform.forward).magnitude;

            Debug.Log("Forward hit:" + forwardHitSpeed);
            if (forwardHitSpeed > breakSpeed) {
                PlayerController.instance.takeOneDamage();
            }
        }
    }


    private void doBreak() {
        if (!applyBreak)
            return;

        Vector3 vel = rb.velocity;
        Vector3 flatVel = Vector3.ProjectOnPlane(vel, Vector3.up);

        flatVel *= stopRatio;
        flatVel.y = vel.y;
        rb.velocity = flatVel;
    }

    public override IEnumerator pushObject(Vector3 point, float power, float totalTime) {
        Vector3 dir = transform.position - point;
        dir = Vector3.ProjectOnPlane(dir, Vector3.up);
        dir.Normalize();

        float elapsedTime = 0;

        Vector3 force = dir * power;
        rb.AddForce(force,ForceMode.Impulse);

        while (elapsedTime < totalTime) {
            applyBreak = false;

            force = dir * power * Time.deltaTime;
            rb.AddForce(force);

            yield return new WaitForEndOfFrame();

            elapsedTime += Time.deltaTime;
        }
        applyBreak = true;
    }




}