using System.Collections.Generic;
using System.Globalization;
using UnityEngine;

namespace Ichni.Story
{
    /// <summary>
    /// 全局剧情变量的统一数据枢纽。
    /// 所有外部系统（包括 Yarn、UI、小游戏）读写剧情变量的唯一官方入口。
    /// 自动桥接至 GameSaveManager 的 StorySaveModule 中持久化。
    /// </summary>
    public static class StoryVariables
    {
        // 应对游戏尚未初始化（或者单独测试场景）的内存兜底
        private static readonly StoryVariablesSave _fallback = new StoryVariablesSave();

        private static StoryVariablesSave Variables
        {
            get
            {
                if (GameSaveManager.instance != null && GameSaveManager.instance.StorySaveModule != null)
                    return GameSaveManager.instance.StorySaveModule.variables;
                return _fallback;
            }
        }

        // ── 读取 ────────────────────────────────────────────────────────────────

        public static float GetFloat(string key, float defaultValue = 0f)
        {
            StoryVariablesSave vars = Variables;
            if (vars.floatVariables.TryGetValue(key, out float f)) return f;
            if (vars.boolVariables.TryGetValue(key, out bool b)) return b ? 1f : 0f;
            if (vars.stringVariables.TryGetValue(key, out string s) && float.TryParse(s, NumberStyles.Any, CultureInfo.InvariantCulture, out float p)) return p;
            return defaultValue;
        }

        public static int GetInt(string key, int defaultValue = 0)
        {
            StoryVariablesSave vars = Variables;
            if (vars.floatVariables.TryGetValue(key, out float f)) return Mathf.RoundToInt(f);
            if (vars.boolVariables.TryGetValue(key, out bool b)) return b ? 1 : 0;
            if (vars.stringVariables.TryGetValue(key, out string s) && float.TryParse(s, NumberStyles.Any, CultureInfo.InvariantCulture, out float p)) return Mathf.RoundToInt(p);
            return defaultValue;
        }

        public static bool GetBool(string key, bool defaultValue = false)
        {
            StoryVariablesSave vars = Variables;
            if (vars.boolVariables.TryGetValue(key, out bool b)) return b;
            if (vars.floatVariables.TryGetValue(key, out float f)) return f != 0f;
            if (vars.stringVariables.TryGetValue(key, out string s) && bool.TryParse(s, out bool p)) return p;
            return defaultValue;
        }

        public static string GetString(string key, string defaultValue = "")
        {
            StoryVariablesSave vars = Variables;
            if (vars.stringVariables.TryGetValue(key, out string s)) return s;
            if (vars.floatVariables.TryGetValue(key, out float f)) return f.ToString(CultureInfo.InvariantCulture);
            if (vars.boolVariables.TryGetValue(key, out bool b)) return b.ToString();
            return defaultValue;
        }

        public static bool HasVariable(string key)
        {
            StoryVariablesSave vars = Variables;
            return vars.floatVariables.ContainsKey(key) || vars.boolVariables.ContainsKey(key) || vars.stringVariables.ContainsKey(key);
        }

        // ── 写入 ────────────────────────────────────────────────────────────────

        public static void SetFloat(string key, float value)
        {
            RemoveStaleEntries(key, keepFloat: true, keepString: false, keepBool: false);
            Variables.floatVariables[key] = value;
        }

        public static void SetInt(string key, int value)
        {
            // 在 Yarn/存档底层中数字统一存为 float，避免双字典冗余
            SetFloat(key, value);
        }

        public static void SetBool(string key, bool value)
        {
            RemoveStaleEntries(key, keepFloat: false, keepString: false, keepBool: true);
            Variables.boolVariables[key] = value;
        }

        public static void SetString(string key, string value)
        {
            RemoveStaleEntries(key, keepFloat: false, keepString: true, keepBool: false);
            Variables.stringVariables[key] = value;
        }

        public static void ClearAll()
        {
            StoryVariablesSave vars = Variables;
            vars.floatVariables.Clear();
            vars.stringVariables.Clear();
            vars.boolVariables.Clear();
        }

        private static void RemoveStaleEntries(string name, bool keepFloat, bool keepString, bool keepBool)
        {
            StoryVariablesSave vars = Variables;
            if (!keepFloat) vars.floatVariables.Remove(name);
            if (!keepString) vars.stringVariables.Remove(name);
            if (!keepBool) vars.boolVariables.Remove(name);
        }

        // ── 字典批量操作（内部供 Yarn Adapter 使用） ─────────────────────────────

        internal static void SetAllVariables(Dictionary<string, float> floats, Dictionary<string, string> strings, Dictionary<string, bool> bools, bool clear = true)
        {
            StoryVariablesSave vars = Variables;
            if (clear)
            {
                vars.floatVariables.Clear();
                vars.stringVariables.Clear();
                vars.boolVariables.Clear();
            }

            if (floats != null) foreach (var kv in floats) vars.floatVariables[kv.Key] = kv.Value;
            if (strings != null) foreach (var kv in strings) vars.stringVariables[kv.Key] = kv.Value;
            if (bools != null) foreach (var kv in bools) vars.boolVariables[kv.Key] = kv.Value;
        }

        internal static (Dictionary<string, float> floats, Dictionary<string, string> strings, Dictionary<string, bool> bools) GetAllVariables()
        {
            StoryVariablesSave vars = Variables;
            return (
                new Dictionary<string, float>(vars.floatVariables),
                new Dictionary<string, string>(vars.stringVariables),
                new Dictionary<string, bool>(vars.boolVariables)
            );
        }
    }
}