using System;
using System.Collections.Generic;
using AibisDream.FixSystem;

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（表现类 + 维修子模块）、yarnVariables。
    /// </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>当前场景（恢复的第一步）。</summary>
        public SceneSnapshotDto scene = new();

        /// <summary>恢复锚点：章节、YarnProject 与节点，读档最后阶段重新进入。</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>
        /// 各子系统快照，key 为 <see cref="SnapshotProviderIds"/> 中的稳定 id。
        /// 表现层与维修模块（含 BlockPuzzle / Memory 等）均在此注册，按 RestoreOrder 还原。
        /// </summary>
        public Dictionary<string, object> sections = new();
    }

    /// <summary>
    /// 恢复锚点：包含宏观章节信息，读档最后阶段加载对话工程并重新 <c>StartDialogue</c>。
    /// </summary>
    [Serializable]
    public class AnchorSnapshot
    {
        /// <summary>当前章节 TalkSceneSO 名称，用于 <see cref="GameManager.SetSceneSoByName"/>。</summary>
        public string sceneSoName;
        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["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;
        /// <summary>Anima：Animator layer 0 当前状态的 normalizedTime。</summary>
        public float stateNormalizedTime;
        public float alpha;
        /// <summary>AnimaEx：最后一次 set_actor_face 的表情名。</summary>
        public string faceName;
        /// <summary>AnimaEx：Animator "Is Talking" 参数。</summary>
        public bool isTalking;
    }

    /// <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;
    }

    /// <summary>sections["subway"]：地铁场景宏观状态（SubwayCenter / OutSideState）。</summary>
    [Serializable]
    public class SubwaySnapshotDto
    {
        /// <summary><see cref="OutSideState"/> 枚举名。</summary>
        public string state;

        /// <summary>状态参数（预留，当前各 State 未使用）。</summary>
        public string args;

        /// <summary>当前新闻图片 Addressable id（<c>Sprite/News[{id}]</c> 中的 id）。</summary>
        public string newsSpriteId;
    }

    /// <summary>sections["fix"]：Fix 场景宏观 Cue（FixSceneDirector），不含面板壳层。</summary>
    [Serializable]
    public class FixSnapshotDto
    {
        /// <summary><see cref="FixSceneMode"/> 枚举名。</summary>
        public string state;

        /// <summary>状态参数（如 BodyModule 的 ModuleState 字符串）。</summary>
        public string args;
    }

    /// <summary>sections["fixPanel"]：FixPanel 壳层 + 线缆/插头状态。</summary>
    [Serializable]
    public class FixPanelSnapshotDto
    {
        public bool isSystemOn;

        /// <summary>RepairSystemManager 当前激活系统类型名；空则默认 BodyModuleSystem。</summary>
        public string currentRepairSystemType;

        public bool isCableRetracted;

        /// <summary>插头插入的 BodyModule 名（data.moduleName）；null/空 = 未插入。</summary>
        public string pluggedModuleName;
    }

    /// <summary>sections["bodyModule"]：插线模块持久物理状态。</summary>
    [Serializable]
    public class BodyModuleSnapshotDto
    {
        /// <summary><see cref="ModuleState"/> 枚举名（Body / Head）。</summary>
        public string moduleState;
        public bool isUFCoverRemoved;
        public bool isUFRemoved;
        public bool isColorRemoved;
        public bool isChipRemoved;
    }

    /// <summary>sections["eye"]：Eye 维修叙事阶段。</summary>
    [Serializable]
    public class EyeSnapshotDto
    {
        /// <summary>Eye 颜色阶段枚举名。</summary>
        public string eyeColorState;
    }

    /// <summary>sections["punchTape"]：打孔带收藏列表。</summary>
    [Serializable]
    public class PunchTapeSnapshotDto
    {
        public List<PunchTape> favorites = new();
    }

    #endregion

    /// <summary>
    /// 从 <see cref="SaveSnapshot"/> 根对象直接读取的宏观摘要（场景 / 章节 SO / YarnProject）。
    /// <para>
    /// scene 与 anchor 已提升到根对象，无需再从 sections 字典派生。
    /// 槽位 / 「继续游戏」等 UI 在需要展示时调用 <see cref="SaveSnapshotSummary.From"/> 即可。
    /// </para>
    /// </summary>
    public readonly struct SaveSnapshotSummary
    {
        /// <summary>Addressable 场景 key（来自 <see cref="SaveSnapshot.scene"/>）。</summary>
        public readonly string SceneName;

        /// <summary>当前 <c>TalkSceneSO</c> 的 asset 名称（来自 <see cref="AnchorSnapshot.sceneSoName"/>）。</summary>
        public readonly string SceneSoName;

        /// <summary>当前 <c>YarnProject</c> 的 name（来自 <see cref="AnchorSnapshot.yarnProjectId"/>）。</summary>
        public readonly string YarnProjectId;

        public SaveSnapshotSummary(string sceneName, string sceneSoName, string yarnProjectId)
        {
            SceneName = sceneName;
            SceneSoName = sceneSoName;
            YarnProjectId = yarnProjectId;
        }

        /// <summary>从快照根对象直接读取宏观摘要。</summary>
        public static SaveSnapshotSummary From(SaveSnapshot snapshot)
        {
            if (snapshot == null)
            {
                return new SaveSnapshotSummary(null, null, null);
            }

            var sceneName = snapshot.scene?.sceneName;
            var sceneSoName = snapshot.anchor?.sceneSoName;
            var yarnProjectId = snapshot.anchor?.yarnProjectId;

            return new SaveSnapshotSummary(sceneName, sceneSoName, yarnProjectId);
        }
    }
}