using System;
using System.Collections.Generic;

namespace AibisDream.SaveSystem
{
    /// <summary>
    /// 当前快照 schema 的版本号。结构变更时递增。
    /// </summary>
    public static class SaveSnapshotSchema
    {
        public const int CurrentVersion = 1;
    }

    /// <summary>
    /// 存档快照根对象：描述「进入可存节点那一刻」的完整游戏状态。
    /// <para>
    /// 与槽位/文件路径解耦；序列化后写入 JSON。对应需求§3 四分类：
    /// anchor（恢复锚点）、sections（宏观 scene/macro + 表现类）、yarnVariables、deepRepair（深度维修，P5）。
    /// </para>
    /// <para>
    /// 宏观阶段（场景 / 章节 SO / YarnProject）不单独冗余存储，统一以 sections["scene"] / sections["macro"]
    /// 为唯一来源；槽位 UI 等需要摘要时通过 <see cref="SaveSnapshotSummary"/> 现算派生，避免重复字段漂移。
    /// </para>
    /// </summary>
    [Serializable]
    public class SaveSnapshot
    {
        /// <summary>快照结构版本，对应 <see cref="SaveSnapshotSchema.CurrentVersion"/>。</summary>
        public int schemaVersion = SaveSnapshotSchema.CurrentVersion;

        /// <summary>保存时的 <c>Application.version</c>。</summary>
        public string gameVersion;

        /// <summary>保存时间（本地），格式 <c>yyyy-MM-dd HH:mm:ss</c>。</summary>
        public string savedAt;

        /// <summary>恢复锚点：读档后从此 Yarn 节点重新进入（所见即所存）。</summary>
        public AnchorSnapshot anchor = new();

        /// <summary>全部 Yarn 运行时变量（来自 <see cref="YarnVariableStorage"/>）。</summary>
        public YarnVariablesSnapshot yarnVariables = new();

        /// <summary>
        /// 各子系统表现类快照，key 为 <see cref="SnapshotProviderIds"/> 中的稳定 id。
        /// </summary>
        public Dictionary<string, object> sections = new();

        /// <summary>
        /// 深度维修段。P1 捕获时不写入（null）；P5 按模块策略填充。
        /// </summary>
        public DeepRepairSnapshot deepRepair;
    }

    /// <summary>
    /// 恢复锚点。读档时在场景与状态还原完成后，从 <see cref="nodeName"/> 重新 <c>StartDialogue</c>。
    /// </summary>
    [Serializable]
    public class AnchorSnapshot
    {
        public string yarnProjectId;
        public string nodeName;
    }

    /// <summary>Yarn 变量三分组，与 Yarn Spinner 支持的类型一致。</summary>
    [Serializable]
    public class YarnVariablesSnapshot
    {
        public Dictionary<string, float> floats = new();
        public Dictionary<string, string> strings = new();
        public Dictionary<string, bool> bools = new();
    }

    #region Provider DTOs

    /// <summary>sections["scene"]：当前加载的场景。</summary>
    [Serializable]
    public class SceneSnapshotDto
    {
        public string sceneName;
    }

    /// <summary>sections["macro"]：章节与 Yarn 工程绑定。</summary>
    [Serializable]
    public class MacroSnapshotDto
    {
        public string sceneSoName;
        public string yarnProjectId;
    }

    /// <summary>sections["env"]：环境时间/天气。</summary>
    [Serializable]
    public class EnvironmentSnapshotDto
    {
        /// <summary><see cref="TimesOfDay"/> 枚举名。</summary>
        public string curTime;

        /// <summary><see cref="Weather"/> 枚举名。</summary>
        public string curWeather;

        public bool isInitialized;
    }

    /// <summary>sections["actor"]：场景中所有角色的逐项状态。</summary>
    [Serializable]
    public class ActorSnapshotDto
    {
        public List<ActorEntrySnapshotDto> actors = new();
    }

    /// <summary>单个角色的快照条目。</summary>
    [Serializable]
    public class ActorEntrySnapshotDto
    {
        public string actorName;
        public string slotName;
        public string actorType;
        public string stateName;
        public float alpha;
        public float faceParam;
    }

    /// <summary>sections["audio"]：FMOD 音乐/SFX 终态与 AMB 状态（不记播放进度）。</summary>
    [Serializable]
    public class AudioSnapshotDto
    {
        /// <summary>key → FMOD event path。</summary>
        public Dictionary<string, string> musicPaths = new();

        public Dictionary<string, string> sfxPaths = new();

        /// <summary><see cref="AmbState"/> 枚举名。</summary>
        public string ambState;
    }

    /// <summary>
    /// Timeline 终/初态标记（决策 D1.1：不按时间轴逐帧还原）。
    /// 序列化进 JSON 时使用字符串形式存入 <see cref="TimelineEntrySnapshotDto.phase"/>。
    /// </summary>
    public enum TimelinePlaybackPhase
    {
        AtStart,
        AtEnd,
        Stopped
    }

    /// <summary>sections["timeline"]：各 PlayableDirector 的终/初态。</summary>
    [Serializable]
    public class TimelineSnapshotDto
    {
        public List<TimelineEntrySnapshotDto> entries = new();
    }

    [Serializable]
    public class TimelineEntrySnapshotDto
    {
        public string directorName;
        public bool isActive;

        /// <summary><see cref="TimelinePlaybackPhase"/> 的字符串名。</summary>
        public string phase;

        /// <summary>若由 Addressables 加载 Timeline，记录 key；否则为空。</summary>
        public string loadedAddressableKey;
    }

    /// <summary>sections["screen"]：屏幕饱和度与演出淡入淡出遮罩。</summary>
    [Serializable]
    public class ScreenSnapshotDto
    {
        /// <summary>Post-process Volume weight（0=正常，1=完全褪色）。</summary>
        public float saturationWeight;

        /// <summary>
        /// <see cref="PlayToolPanel"/> 演出遮罩终态：<c>true</c> = 黑屏盖住（<c>FadeIn</c> 完成）；
        /// <c>false</c> = 画面可见（<c>FadeOut</c> 完成或遮罩未启用）。不记录转场中间 alpha。
        /// </summary>
        public bool isFadeScreenCovered;
    }

    #endregion
}