using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;

public class CharacterCardView : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
{
    public int characterID;
    public string currentBoundaryLevel;
    public GameObject charactCard;
    public Image characterImage;
    public Image levelIcon;
    public Image occupationIcon;
    public bool isSelected=false;

    // drag
    private GameObject dragGhost;
    private Canvas rootCanvas;
    private CanvasGroup canvasGroup;

    void Start()
    {
        charactCard = gameObject;
        rootCanvas = GetComponentInParent<Canvas>();
        canvasGroup = GetComponent<CanvasGroup>() ?? gameObject.AddComponent<CanvasGroup>();
    }
    /// <summary>
    /// 未在队中的卡点击后进入被操纵状态。若在队伍中默认进入已经入队状态
    /// </summary>
    public void beSelected()
    {
        if (!isSelected)
        {
            isSelected = true;
            TeamManager.Instance.currentSelectedCharacterCard = new CharacterView(characterID, currentBoundaryLevel);
            characterImage.color = new Color(0.5f, 0.5f, 0.5f,1);
        }
        else beUnSelected();
    }
    
    public void beUnSelected()
    {
        //还需要走TeamManager去掉此角色的队列信息
        isSelected = false;
        TeamManager.Instance.removeTeamCharacter(characterID);
        characterImage.color = new Color(1f, 1f, 1f,1);
    }

    // Drag handlers: create ghost based on characterImage.sprite
    public void OnBeginDrag(PointerEventData eventData)
    {
        Debug.Log($"CharacterCardView OnBeginDrag: {gameObject.name}");
        if (characterImage == null || characterImage.sprite == null) return;
        if (rootCanvas == null) rootCanvas = GetComponentInParent<Canvas>();
        if (rootCanvas == null) return;

        // prevent the original from blocking raycasts so drop targets can receive events
        if (canvasGroup == null) canvasGroup = GetComponent<CanvasGroup>() ?? gameObject.AddComponent<CanvasGroup>();
        canvasGroup.blocksRaycasts = false;

        // ensure pointerDrag references this object for drop handlers
        eventData.pointerDrag = gameObject;

        dragGhost = new GameObject("_RoleDragGhost");
        dragGhost.transform.SetParent(rootCanvas.transform, false);
        var img = dragGhost.AddComponent<Image>();
        img.raycastTarget = false;
        img.sprite = characterImage.sprite;
        img.SetNativeSize();
        var cg = dragGhost.AddComponent<CanvasGroup>();
        cg.blocksRaycasts = false;
        cg.alpha = 0.5f; // Set transparency to half

        UpdateGhostPosition(eventData);
    }

    public void OnDrag(PointerEventData eventData)
    {
        if (dragGhost == null) return;
        UpdateGhostPosition(eventData);
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        Debug.Log($"CharacterCardView OnEndDrag: {gameObject.name}");
        if (dragGhost != null)
        {
            Destroy(dragGhost);
            dragGhost = null;
        }
        // restore raycast blocking on the original
        if (canvasGroup != null)
            canvasGroup.blocksRaycasts = true;
    }

    private void UpdateGhostPosition(PointerEventData eventData)
    {
        if (rootCanvas == null) return;
        RectTransformUtility.ScreenPointToLocalPointInRectangle(
            rootCanvas.transform as RectTransform,
            eventData.position,
            eventData.pressEventCamera,
            out Vector2 localPoint);
        if (dragGhost != null)
            dragGhost.transform.localPosition = localPoint;
    }
}