using AibisDream.UI;
using UnityEngine;

namespace AibisDream.SaveSystem
{
    /// <summary>
    /// screen section 的捕获/还原实现：屏幕后处理饱和度 + ScreenTransitionPanel 遮罩终态。
    /// screen section：饱和度 + 全局遮罩终态（<see cref="ScreenTransitionPanel.CaptureScreenCovered"/>）。
    /// 供 <see cref="ScreenSnapshotProvider"/> 委托，避免 Provider 直接依赖 UI 细节。
    /// </summary>
    public static class ScreenSnapshotHelper
    {
        private static bool _hasDeferredFadeScreenCovered;
        private static bool _deferredFadeScreenCovered;

        public static ScreenSnapshotDto Capture()
        {
            var dto = new ScreenSnapshotDto();

            if (ScreenEffectManager.Instance != null && ScreenEffectManager.Instance.saturation != null)
            {
                dto.saturationWeight = ScreenEffectManager.Instance.saturation.weight;
            }

            if (UIManager.Instance != null)
            {
                var panel = UIManager.Instance.GetPanel<ScreenTransitionPanel>();
                if (panel != null)
                {
                    dto.isFadeScreenCovered = panel.CaptureScreenCovered();
                }
            }

            return dto;
        }

        public static void Restore(ScreenSnapshotDto dto)
        {
            if (dto == null) return;

            if (ScreenEffectManager.Instance != null && ScreenEffectManager.Instance.saturation != null)
            {
                ScreenEffectManager.Instance.saturation.weight = dto.saturationWeight;
            }

            if (UIManager.Instance != null)
            {
                if (SaveRestoreOrchestrator.IsRestoring)
                {
                    _hasDeferredFadeScreenCovered = true;
                    _deferredFadeScreenCovered = dto.isFadeScreenCovered;
                    return;
                }

                var panel = UIManager.Instance.GetPanel<ScreenTransitionPanel>();
                panel?.ApplyScreenCovered(dto.isFadeScreenCovered);
            }
        }

        /// <summary>读档 FadeOut 完成后应用延迟的遮罩终态。</summary>
        public static void ApplyDeferredFadeScreenIfNeeded()
        {
            if (!_hasDeferredFadeScreenCovered)
            {
                return;
            }

            _hasDeferredFadeScreenCovered = false;
            var panel = UIManager.Instance?.GetPanel<ScreenTransitionPanel>();
            panel?.ApplyScreenCovered(_deferredFadeScreenCovered);
        }
    }
}