using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
using XericLibrary.Runtime.SuperStyleSheet;
using XericUI.Core.StyleSheetUI;
using XericUI.Helper;

namespace XericUI.OverrideUI
{
    /// <summary>
    /// 基于 SuperStyleSheet 的按钮组件。
    /// 通过 TransitionMode 选择颜色切换、纹理切换或两者并用，
    /// 替代 Unity 内置的 ColorBlock 和 SpriteState。
    /// </summary>
    [AddComponentMenu("Xeric UI Vessel/UI/Style Button", 51)]
    public class XericStyleButton : Button, IStyleRefreshable
    {
        /// <summary>样式过渡模式</summary>
        public enum TransitionMode
        {
            /// <summary>仅颜色切换</summary>
            Color,
            /// <summary>仅纹理/Sprite 切换</summary>
            Sprite,
            /// <summary>颜色 + 纹理切换</summary>
            ColorAndSprite
        }

        #region 序列化字段

        [Header("过渡模式")]
        [SerializeField]
        [Tooltip("选择颜色 / 纹理 / 同时切换")]
        private TransitionMode m_TransitionMode = TransitionMode.ColorAndSprite;

        [Header("样式表状态")] [SerializeField]
		[Tooltip("五态颜色样式块（ColorTint）")]
		private StyleSheetState m_ColorState = new StyleSheetState("button", Transition.ColorTint);

		[SerializeField]
		[Tooltip("五态纹理样式块（SpriteState）")]
		private StyleSheetState m_TextureState = new StyleSheetState("button", Transition.SpriteSwap);

        [SerializeField] [Tooltip("启用样式表驱动过渡（关闭则回退为 Unity ColorBlock）")]
        private bool m_EnableStyleTransition = true;

        #endregion

        #region 运行时

        [System.NonSerialized] private StyleSheetSelectionState m_CurrentState = StyleSheetSelectionState.Normal;
        [System.NonSerialized] private Graphic m_TargetGraphic;
        [System.NonSerialized] private Image m_TargetImage;

        #endregion

        #region 生命周期

        protected override void Awake()
        {
            base.Awake();
            m_TargetGraphic = targetGraphic;
            m_TargetImage = m_TargetGraphic as Image;
        }

        protected override void OnEnable()
        {
            base.OnEnable();

            RevalidateStyles();

            StyleRefreshManager.Register(this);
            ApplyForState(m_CurrentState);
        }

#if UNITY_EDITOR
        protected override void OnValidate()
        {
            base.OnValidate();
            RevalidateStyles();
            ApplyForState(m_CurrentState);
        }
#endif

        private void RevalidateStyles()
        {
            m_ColorState?.UnsubscribeAll(OnStyleChanged);
            m_TextureState?.UnsubscribeAll(OnStyleChanged);

            m_ColorState?.RegisterAll();
            m_TextureState?.RegisterAll();
            m_ColorState?.SubscribeAll(OnStyleChanged);
            m_TextureState?.SubscribeAll(OnStyleChanged);
        }

        protected override void OnDisable()
        {
            StyleRefreshManager.Unregister(this);

            m_ColorState?.UnsubscribeAll(OnStyleChanged);
            m_TextureState?.UnsubscribeAll(OnStyleChanged);
            m_ColorState?.UnregisterAll();
            m_TextureState?.UnregisterAll();

            base.OnDisable();
        }

        #endregion

        #region 状态过渡

        protected override void DoStateTransition(SelectionState state, bool instant)
        {
            if (!gameObject.activeInHierarchy) return;

            m_CurrentState = (StyleSheetSelectionState)(int)state;

            if (m_EnableStyleTransition)
                ApplyForState(m_CurrentState, instant);
            else
                base.DoStateTransition(state, instant);
        }

        #endregion

        #region 样式应用

        public void RefreshStyle()
        {
            ApplyForState(m_CurrentState, false);
        }

        private void ApplyForState(StyleSheetSelectionState state, bool instant = false)
        {
            if (m_TransitionMode == TransitionMode.Color || m_TransitionMode == TransitionMode.ColorAndSprite)
            {
                if (m_ColorState != null)
                {
                    StyleField colorField = m_ColorState.GetForState(state);
                    if (colorField != null && m_TargetGraphic != null)
                    {
                        StyleValue val = colorField.GetValue();
                        if (val != null)
                            m_TargetGraphic.CrossFadeColor((Color)val,
                                instant ? 0f : m_ColorState.FadeDuration, true, true);
                    }
                }
            }

            if (m_TransitionMode == TransitionMode.Sprite || m_TransitionMode == TransitionMode.ColorAndSprite)
            {
                if (m_TextureState != null && m_TargetImage != null)
                {
                    StyleField texField = m_TextureState.GetForState(state);
                    if (texField != null)
                    {
                        StyleValue val = texField.GetValue();
                        Texture2D tex = val?.GetValueAs<Texture2D>();
                        if (tex != null)
                            m_TargetImage.overrideSprite = Sprite.Create(tex,
                                new Rect(0, 0, tex.width, tex.height),
                                new Vector2(0.5f, 0.5f));
                    }
                }
            }
        }

        private void OnStyleChanged(StyleValue _)
        {
            if (gameObject.activeInHierarchy)
                ApplyForState(m_CurrentState);
        }

        #endregion

        #region 组件替换

#if UNITY_EDITOR
        [UnityEditor.MenuItem("CONTEXT/XericStyleButton/Xeric UI/强制刷新样式", false, 1)]
        private static void ForceRefreshStyle(UnityEditor.MenuCommand command)
        {
            StyleRefreshManager.ForceRefreshAll();
        }

        [UnityEditor.MenuItem("CONTEXT/Button/Replace To/Xeric (Style)", true)]
        private static bool ValidateReplaceToStyleButton(UnityEditor.MenuCommand command)
            => command.context is Button and not XericStyleButton;

        [UnityEditor.MenuItem("CONTEXT/Button/Replace To/Xeric (Style)", false, 11)]
        private static void ReplaceToStyleButton(UnityEditor.MenuCommand command)
            => command.ReplaceCommandContext<Button, XericStyleButton,
                (Graphic targetGraphic, ButtonClickedEvent onClick, Navigation navigation)>(
                o => (o.targetGraphic, o.onClick, o.navigation),
                (t, d) =>
                {
                    t.targetGraphic = d.targetGraphic;
                    t.onClick = d.onClick;
                    t.navigation = d.navigation;
                });

        [UnityEditor.MenuItem("CONTEXT/Button/Replace To/Unity Button (Style)", true)]
        private static bool ValidateReplaceStyleToUnity(UnityEditor.MenuCommand command)
            => command.context is XericStyleButton;

        [UnityEditor.MenuItem("CONTEXT/Button/Replace To/Unity Button (Style)", false, 100)]
        private static void ReplaceStyleToUnity(UnityEditor.MenuCommand command)
            => command.ReplaceCommandContext<XericStyleButton, Button,
                (Graphic targetGraphic, ButtonClickedEvent onClick, Navigation navigation)>(
                o => (o.targetGraphic, o.onClick, o.navigation),
                (t, d) =>
                {
                    t.targetGraphic = d.targetGraphic;
                    t.onClick = d.onClick;
                    t.navigation = d.navigation;
                });
#endif

        #endregion
    }
}