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

[RequireComponent(typeof(CharacterController))]
[RequireComponent(typeof(AudioSource))]
public class PlayerController : MonoBehaviour
{
    public float walkSpeed;
    public float runSpeed;
    private Vector3 movement;
    private CharacterController characterController;
    private AudioSource audioSource;

    public GameObject FPSCamera;
    private Vector3 moveDir = Vector3.zero;

    private float gravity = 9.8f;
    public float jumpPower;
    public AudioClip jumpSound;

    private float runStepLengthen = 0.7f;
    private float stepInterval = 10f;
    private float stepCycle;
    private float nextStep;
    private float speed;
    private bool isWalking;
    public AudioClip stepSound;

    private Vector3 initialCameraPosition;
    private float timer = 0;
    private float bobbingSpeed = 10f;
    private float walkBobbing = 0.04f;
    private float runBobbing = 0.07f;

    // ★追加（スパイダーフック）
    private enum State
    {
        Normal,
        ThrowingHook,
        FlyingPlayer
    }

    // ★追加（スパイダーフック）
    public float hookRange = 100f;
    public Transform hookTargetMark;
    public Transform hookShot;
    private Vector3 hookPoint;
    private float hookShotSize;
    private State state;


    private void Start()
    {
        characterController = GetComponent<CharacterController>();
        audioSource = GetComponent<AudioSource>();
        initialCameraPosition = FPSCamera.transform.localPosition;

        // ★追加（スパイダーフック）
        state = State.Normal;
        hookShot.gameObject.SetActive(false);
        hookTargetMark.gameObject.SetActive(false);
    }

    private void Update()
    {
        // ★改良＆追加（スパイダーフック）
        // （テクニック）
        // enumとswitch文を組み合わせることで、『この状態（モード）の時は、このメソッドを実行する』という仕組みを作れる。
        switch(state)
        {
            default:
            case State.Normal: // ノーマルモードの時
                PlayerMove();
                ProgressStepCycle(speed);
                HeadBob();
                HookStart();
                break;

            case State.ThrowingHook: // フック投げモードの時
                HookThrow();
                break;

            case State.FlyingPlayer: // プレーヤーが空中移動の時
                HookFlyingMovement();
                break;
        }
    }

    void PlayerMove()
    {
        float moveH = Input.GetAxis("Horizontal");
        float moveV = Input.GetAxis("Vertical");
        movement = new Vector3(moveH, 0, moveV);

        Vector3 desiredMove = FPSCamera.transform.forward * movement.z + FPSCamera.transform.right * movement.x;
        moveDir.x = desiredMove.x * 5f;
        moveDir.z = desiredMove.z * 5f;

        if (Input.GetKey(KeyCode.LeftShift))
        {
            characterController.Move(moveDir * Time.deltaTime * runSpeed);
            isWalking = false;
            speed = runSpeed;
        }
        else
        {
            characterController.Move(moveDir * Time.deltaTime * walkSpeed);
            isWalking = true;
            speed = walkSpeed;
        }

        if (characterController.isGrounded)
        {
            if (Input.GetKeyDown(KeyCode.Space))
            {
                moveDir.y = jumpPower;
                audioSource.clip = jumpSound;
                audioSource.Play();
            }
        }
        else
        {
            moveDir.y -= gravity * Time.deltaTime;
        }
    }

    void PlayStepSound()
    {
        if (!characterController.isGrounded)
        {
            return;
        }

        audioSource.clip = stepSound;
        audioSource.PlayOneShot(audioSource.clip);
    }

    void ProgressStepCycle(float speed)
    {
        if (characterController.velocity.sqrMagnitude > 0 && (movement.x != 0 || movement.z != 0))
        {
            stepCycle += (characterController.velocity.magnitude + (speed * (isWalking ? 1f : runStepLengthen))) * Time.deltaTime;
        }

        if (!(stepCycle > nextStep))
        {
            return;
        }

        nextStep = stepCycle + stepInterval;
        PlayStepSound();
    }

    void HeadBob()
    {
        Vector3 newCameraPosition;
        float bobbingAmount;

        if (characterController.velocity.sqrMagnitude > 0 && (movement.x != 0 || movement.z != 0))
        {
            timer += (Time.deltaTime * bobbingSpeed);
            bobbingAmount = isWalking ? walkBobbing : runBobbing;

            FPSCamera.transform.localPosition = new Vector3(0, initialCameraPosition.y + Mathf.Sin(timer) * bobbingAmount, 0);
            newCameraPosition = FPSCamera.transform.localPosition;
        }
        else
        {
            timer = 0;
            newCameraPosition = FPSCamera.transform.localPosition;
        }

        FPSCamera.transform.localPosition = newCameraPosition;
    }

    // ★追加（スパイダーフック）
    void  HookStart()
    {
        // マウスの右ボタンを推した時
        if(Input.GetMouseButtonDown(1))
        {
            RaycastHit hit;

            if(Physics.Raycast(FPSCamera.transform.position, FPSCamera.transform.forward, out hit, hookRange))
            {
                // Rayで特定した位置にターゲットマーク(目印）を移動させる。
                hookTargetMark.position = hit.point;
                hookPoint = hit.point;

                state = State.ThrowingHook;
                hookShotSize = 0f;

                hookTargetMark.gameObject.SetActive(true);
                hookShot.gameObject.SetActive(true);
            }
        }
    }

    // ★追加（スパイダーフック）
    void HookFlyingMovement()
    {
        Vector3 moveDir = (hookPoint - transform.position).normalized;

        // （テクニック）
        // 現在地と目的地の距離が遠いほど移動速度が早い（近くなるにつれて減速）
        float flyingSpeed = Vector3.Distance(transform.position, hookPoint) * 2f;

        characterController.Move(moveDir * flyingSpeed * Time.deltaTime);

        // 右クリックでスパイダーフックの解除
        if(Input.GetMouseButtonDown(1))
        {
            // ノーマルモードに移行する
            state = State.Normal;
            hookTargetMark.gameObject.SetActive(false);
            hookShot.gameObject.SetActive(false);
        }

        // 目標地点の近くまで来るとフックショットを自動的に隠す
        if(Vector3.Distance(transform.position, hookPoint) < 2f)
        {
            hookShot.gameObject.SetActive(false);
        }
    }

    // ★追加（スパイダーフック）
    void HookThrow()
    {
        hookShot.LookAt(hookPoint);

        float hookShotSpeed = 50f;
        hookShotSize += hookShotSpeed * Time.deltaTime;
        hookShot.localScale = new Vector3(1, 1, hookShotSize);

        if(hookShotSize >=  Vector3.Distance(transform.position, hookPoint))
        {
            // 空中移動モードに移行（空中移動を開始する）
            state = State.FlyingPlayer;
        }
    }
}