using System;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

namespace HotUpdate.UI
{
    /// <summary>
    /// UI_ConfirmDialog：公告 / 维护 / 通用确认。
    /// </summary>
    public sealed class ConfirmDialogView : MonoBehaviour
    {
        public const string PrefabName = "UI_ConfirmDialog";

        TextMeshProUGUI _title;
        TextMeshProUGUI _message;
        Button _ok;
        Button _cancel;
        Button _close;
        Action _onOk;
        Action _onCancel;
        RectTransform _okRect;
        Vector2 _okAnchorMin, _okAnchorMax, _okPivot, _okPosition;
        ScrollRect _messageScroll;

        public struct ViewState
        {
            public string Title, Message;
            public bool Visible, ShowCancel;
            public Action OnOk, OnCancel;
        }

        public ViewState CaptureState() => new ViewState
        {
            Title = _title != null ? _title.text : string.Empty,
            Message = _message != null ? _message.text : string.Empty,
            Visible = gameObject.activeSelf,
            ShowCancel = _cancel != null && _cancel.gameObject.activeSelf,
            OnOk = _onOk,
            OnCancel = _onCancel
        };

        public void RestoreState(ViewState state)
        {
            Show(state.Title, state.Message, state.OnOk, state.OnCancel, state.ShowCancel);
            if (!state.Visible) Hide();
        }

        public void Bind()
        {
            _title = FindTmp("Txt_Title");
            _message = FindTmp("Txt_Message");
            _ok = FindBtn("Btn_Ok");
            _cancel = FindBtn("Btn_Cancel");
            _close = FindBtn("Btn_Close");
            if (_ok != null)
            {
                _okRect = _ok.GetComponent<RectTransform>();
                _okAnchorMin = _okRect.anchorMin;
                _okAnchorMax = _okRect.anchorMax;
                _okPivot = _okRect.pivot;
                _okPosition = _okRect.anchoredPosition;
            }
            _messageScroll = GetComponentInChildren<ScrollRect>(true);

            Wire(_ok, () => { _onOk?.Invoke(); Hide(); });
            Wire(_cancel, () => { _onCancel?.Invoke(); Hide(); });
            Wire(_close, () => { _onCancel?.Invoke(); Hide(); });
        }

        public void Show(
            string title,
            string message,
            Action onOk = null,
            Action onCancel = null,
            bool showCancel = false)
        {
            if (_title != null) _title.text = title ?? string.Empty;
            if (_message != null) _message.text = message ?? string.Empty;
            _onOk = onOk;
            _onCancel = onCancel;
            if (_cancel != null) _cancel.gameObject.SetActive(showCancel);
            if (_okRect != null)
            {
                _okRect.anchorMin = showCancel ? _okAnchorMin : new Vector2(0.5f, _okAnchorMin.y);
                _okRect.anchorMax = showCancel ? _okAnchorMax : new Vector2(0.5f, _okAnchorMax.y);
                _okRect.pivot = showCancel ? _okPivot : new Vector2(0.5f, _okPivot.y);
                _okRect.anchoredPosition = showCancel ? _okPosition : new Vector2(0, _okPosition.y);
            }
            if (_messageScroll != null && _messageScroll.content != null)
            {
                _messageScroll.StopMovement();
                _messageScroll.content.anchoredPosition = Vector2.zero;
            }
            gameObject.SetActive(true);
        }

        public void Hide()
        {
            gameObject.SetActive(false);
        }

        static void Wire(Button btn, Action action)
        {
            if (btn == null) return;
            btn.onClick.RemoveAllListeners();
            btn.onClick.AddListener(() => action?.Invoke());
        }

        TextMeshProUGUI FindTmp(string name)
        {
            foreach (var c in GetComponentsInChildren<TextMeshProUGUI>(true))
                if (c.name == name) return c;
            return null;
        }

        Button FindBtn(string name)
        {
            foreach (var c in GetComponentsInChildren<Button>(true))
                if (c.name == name) return c;
            return null;
        }
    }
}