using UnityEngine;
using UnityEngine.EventSystems;

public class MainCharacterDebugMovement : MonoBehaviour
{
    [Header("电脑调试移动")]
    [Min(0f)]
    public float moveSpeed = 4f;

    [Min(0f)]
    public float clickStopDistance = 0.08f;

    [Header("移动范围")]
    public bool limitToBattlePlatform = true;
    public Vector2 xLimits = new Vector2(-7.5f, 7.5f);
    public Vector2 zLimits = new Vector2(-14f, 14f);

    private Animator animator;
    private Vector3 clickTarget;
    private bool hasClickTarget;

    public bool IsMoving =>
        hasClickTarget ||
        new Vector2(Input.GetAxisRaw("Horizontal"), Input.GetAxisRaw("Vertical")).sqrMagnitude > 0.001f;

    private void Start()
    {
        animator = GetComponent<Animator>();
        clickTarget = transform.position;
        SetWalking(false);
    }

    private void Update()
    {
        HandleClickTarget();

        Vector3 keyboardInput = new Vector3(
            Input.GetAxisRaw("Horizontal"),
            0f,
            Input.GetAxisRaw("Vertical"));

        if (keyboardInput.sqrMagnitude > 0.001f)
        {
            hasClickTarget = false;
            Move(keyboardInput.normalized);
            return;
        }

        if (!hasClickTarget)
        {
            SetWalking(false);
            return;
        }

        Vector3 toTarget = clickTarget - transform.position;
        toTarget.y = 0f;

        if (toTarget.magnitude <= clickStopDistance)
        {
            hasClickTarget = false;
            SetWalking(false);
            return;
        }

        Move(toTarget.normalized);
    }

    private void HandleClickTarget()
    {
        if (!Input.GetMouseButtonDown(0) || Camera.main == null)
        {
            return;
        }

        if (EventSystem.current != null && EventSystem.current.IsPointerOverGameObject())
        {
            return;
        }

        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        if (!Physics.Raycast(ray, out RaycastHit hit))
        {
            return;
        }

        clickTarget = hit.point;
        clickTarget.y = transform.position.y;
        hasClickTarget = true;
    }

    public void StopMovement()
    {
        hasClickTarget = false;
        SetWalking(false);
    }

    private void Move(Vector3 direction)
    {
        direction.y = 0f;
        if (direction.sqrMagnitude <= 0.001f)
        {
            SetWalking(false);
            return;
        }

        SetWalking(true);
        transform.position += direction * moveSpeed * Time.deltaTime;
        if (limitToBattlePlatform)
        {
            Vector3 position = transform.position;
            position.x = Mathf.Clamp(position.x, xLimits.x, xLimits.y);
            position.z = Mathf.Clamp(position.z, zLimits.x, zLimits.y);
            transform.position = position;
        }

        transform.rotation = Quaternion.LookRotation(direction, Vector3.up);
    }

    private void SetWalking(bool walking)
    {
        if (animator != null)
        {
            animator.SetInteger("speed", walking ? 1 : 0);
        }
    }
}