using Godot;
using System;
using System.Collections.Generic;
using Models;
using Core;

/// <summary>
/// 游戏主控制节点（MVC 的桥接层）
/// 设计说明：
/// 1) 负责初始化 GameSession，并把输入/信号转交给 Controller/System。
/// 2) 仅做“流程调度”，不直接计算复杂数值，避免逻辑堆积。
/// 注意事项：
/// - View 与 Model 的绑定应逐步迁移到独立 View 脚本，避免在此类膨胀。
/// 未来扩展：
/// - 可拆分为 SceneRoot + UIController + DebugController，分层管理。
/// </summary>
public partial class GameManager : Node
{
	/// <summary>
	/// 指示当前是否处于教程模式
	/// </summary>
	public static bool IsTutorial { get; private set; }
    
    /// <summary>
    /// 下一个场景的路径
    /// </summary>
	public static string NextScene { get; set; } = null;
    
    /// <summary>
    /// 双倍大小的箭头光标资源
    /// </summary>
	public static readonly Resource Arrow2X = ResourceLoader.Load("res://temp_res/kenney_ui-pack-space-expansion/PNG/Extra/Double/cursor_f.png");
	
    /// <summary>
    /// 最大回合数
    /// </summary>
	[Export]
	public int MaxTurns = 30;

	// --- Global State ---
    
    /// <summary>
    /// 游戏会话实例
    /// </summary>
	public GameSession Session { get; private set; }
    
    /// <summary>
    /// 当前游戏状态
    /// </summary>
	public GameState State => Session?.State;
    
    /// <summary>
    /// 游戏控制器
    /// </summary>
	public GameController Controller { get; private set; }

    /// <summary>
    /// 当前游戏阶段
    /// </summary>
	public GamePhase CurrentPhase => State?.Turn.Phase ?? GamePhase.Planning;
    
    /// <summary>
    /// 当前回合数
    /// </summary>
	public int CurrentTurn => State?.Turn.CurrentTurn ?? 1;

	// --- Domain Model ---
    
    /// <summary>
    /// 导师模型
    /// </summary>
	public MentorModel Mentor => State?.Roster.Mentor;
    
    /// <summary>
    /// 学生列表
    /// </summary>
	public List<StudentModel> Students => State?.Roster.Students;
    
    /// <summary>
    /// 当前活动任务列表
    /// </summary>
	public List<TaskModel> ActiveTasks => State?.Tasks.ActiveTasks;
    
    /// <summary>
    /// 经济状态
    /// </summary>
	public EconomyState Economy => State?.Economy;
	
	// --- Signals ---
    /// <summary>
    /// 阶段变更信号
    /// </summary>
    /// <param name="phase">阶段枚举的整数值</param>
	[Signal] public delegate void PhaseChangedEventHandler(int phase); // int cast of GamePhase
    
    /// <summary>
    /// 回合变更信号
    /// </summary>
    /// <param name="turn">当前回合数</param>
	[Signal] public delegate void TurnChangedEventHandler(int turn);

	// Singleton instance access (if needed, though Godot uses node paths)
    /// <summary>
    /// 单例实例
    /// </summary>
	public static GameManager Instance { get; private set; }

    /// <summary>
    /// 进入场景树时调用
    /// </summary>
	public override void _EnterTree()
	{
		Instance = this;
	}

    /// <summary>
    /// 准备就绪时调用
    /// </summary>
	public override void _Ready()
	{
		Input.SetCustomMouseCursor(Arrow2X);
		
		// MVP Initialization
		InitializeGame();
	}

    /// <summary>
    /// 初始化游戏数据
    /// </summary>
	private void InitializeGame()
	{
		Session = GameSession.CreateDefault();
		Controller = new GameController();
		Controller.Initialize(Session);
		State.Turn.MaxTurns = MaxTurns;
		State.Turn.CurrentTurn = 1;
		State.Turn.Phase = GamePhase.Planning;
		
		// MVP: Add a test student
		var s1 = new StudentModel("张三");
		Students.Add(s1);
		
		// MVP: Add a test task
		var t1 = new TaskModel("深度学习导论", TaskKind.AcademicExploration, 1000f, 3);
		t1.Reward.Money = 1000;
		t1.Reward.Reputation = 5;
		ActiveTasks.Add(t1);

		GD.Print("Game Initialized. Phase: Planning, Turn: 1");
	}

	// Called every frame. 'delta' is the elapsed time since the previous frame.
    /// <summary>
    /// 每帧调用
    /// </summary>
    /// <param name="delta">距离上一帧的时间间隔</param>
	public override void _Process(double delta)
	{
		if (CurrentPhase == GamePhase.Execution)
		{
			// Update game logic (timers, etc.)
			// In a real implementation, this might manage the global timer for the day/week
		}

		Session?.Tick((float)delta);
	}

	/// <summary>
	/// 结束筹备阶段，开始执行
	/// </summary>
	public void StartExecution()
	{
		if (CurrentPhase != GamePhase.Planning) return;
		
		Controller.StartExecution();
		EmitSignal(SignalName.PhaseChanged, (int)CurrentPhase);
		GD.Print("Phase Changed: Execution");
		
		// Notify all agents to start working (this would be handled by a system listening to the signal)
	}

	/// <summary>
	/// 结束执行阶段（通常由时间耗尽或玩家手动触发），进入结算
	/// </summary>
	public void EndExecution()
	{
		if (CurrentPhase != GamePhase.Execution) return;

		Controller.EndExecution();
		EmitSignal(SignalName.PhaseChanged, (int)CurrentPhase);
		GD.Print("Phase Changed: Review");
		
		PerformReview();
	}

	/// <summary>
	/// 执行结算逻辑，并准备下一回合
	/// </summary>
	private void PerformReview()
	{
		Session.Systems.Task.ResolveEndOfTurn();
		Session.Events.Publish(new TurnEndedEvent(CurrentTurn));

		GD.Print("Review Complete. Waiting for Next Turn confirmation.");
	}

	/// <summary>
	/// 开始新的回合
	/// </summary>
	public void StartNextTurn()
	{
		if (CurrentPhase != GamePhase.Review) return;

		Controller.StartNextTurn();
		if (CurrentTurn > State.Turn.MaxTurns)
		{
			GD.Print("Game Over!");
			// Handle Game Over
			return;
		}

		State.Turn.Phase = GamePhase.Planning;
		EmitSignal(SignalName.TurnChanged, CurrentTurn);
		EmitSignal(SignalName.PhaseChanged, (int)CurrentPhase);
		
		// Refresh resources/AP
		Mentor.Resources.Energy.Current.Value = Mentor.Resources.Energy.UpperThreshold;
		
		GD.Print($"Turn {CurrentTurn} Started. Phase: Planning");
	}
}