using System;
using DynamicExpresso;
using Ichni.Story;
using Ichni.Story.UI;
using UnityEngine;

namespace Ichni.Story
{
    public static partial class StoryInterpreters
    {
        public static readonly Interpreter FunctionInterpreter;
        public static readonly Interpreter ConditionInterpreter;
        
        static StoryInterpreters()
        {
            FunctionInterpreter = new Interpreter();
            ConditionInterpreter = new Interpreter();
            
            SetFunctionInterpreter();
            SetConditionInterpreter();
        }
        
        static void SetFunctionInterpreter()
        {
            FunctionInterpreter.SetFunction("SetVariable", new Action<string, int>(SetStoryVariable));
            FunctionInterpreter.SetFunction("GetVariable", new Func<string, int>(GetStoryVariable));
            FunctionInterpreter.SetFunction("GenerateDialogBlock", new Action<string>(GenerateDialogBlock));
            FunctionInterpreter.SetFunction("GenerateSongBlock", new Action<string>(GenerateSongBlock));
        }

        static void SetConditionInterpreter()
        {
            ConditionInterpreter.SetFunction("GetVariable", new Func<string, int>(GetStoryVariable));
        }
    }

    public static partial class StoryInterpreters
    {
        /// <summary>
        /// 设置全局变量的值
        /// </summary>
        static void SetStoryVariable(string variableName, int value)
        {
            GameSaveManager.instance.StorySaveModule.storyVariables[variableName] = value;
        }
        
        /// <summary>
        /// 获取全局变量的值
        /// </summary>
        static int GetStoryVariable(string variableName)
        {
            if (GameSaveManager.instance.StorySaveModule.storyVariables.TryGetValue(variableName, out int value))
            {
                return value;
            }

            throw new ArgumentException($"Global variable '{variableName}' not found.");
        }
    }

    public static partial class StoryInterpreters
    {
        static void GenerateDialogBlock(string blockName)
        {
            StoryBlockUIBase currentBlock = StoryManager.instance.storyline.currentBlock;
            Vector2 positionOffset = new Vector2(500, 0);
            DialogBlockUI newBlock = StoryManager.instance.storyline.GenerateDialogBlock(blockName, currentBlock.blockPosition + positionOffset, StoryBlockState.Current);
            StoryManager.instance.storyline.GenerateConnector(currentBlock, newBlock);
        }

        static void GenerateSongBlock(string blockName)
        {
            StoryBlockUIBase currentBlock = StoryManager.instance.storyline.currentBlock;
            Vector2 positionOffset = new Vector2(500, 0);
            SongBlockUI newBlock = StoryManager.instance.storyline.GenerateSongBlock(blockName, currentBlock.blockPosition + positionOffset, StoryBlockState.Current);
            StoryManager.instance.storyline.GenerateConnector(currentBlock, newBlock);
        }
    }
}