// Copyright Epic Games, Inc. All Rights Reserved.

#pragma once

#include "CoreMinimal.h"
#include "Subsystems/GameInstanceSubsystem.h"
#include "../../Quest/QuestTypes.h"
#include "QuestManager.generated.h"

class UQuestAsset;

/**
 * 任务运行时数据
 */
USTRUCT(BlueprintType)
struct FQuestRuntimeData
{
	GENERATED_BODY()

	/** 任务资产引用 */
	UPROPERTY(BlueprintReadOnly)
	TObjectPtr<UQuestAsset> QuestAsset;

	/** 任务状态 */
	UPROPERTY(BlueprintReadWrite)
	EQuestState State = EQuestState::NotStarted;

	/** 目标进度 */
	UPROPERTY(BlueprintReadWrite)
	TArray<FQuestProgress> ObjectiveProgress;
};

// 任务事件委托
DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FOnQuestStateChanged, int32, QuestID);
DECLARE_DYNAMIC_MULTICAST_DELEGATE_TwoParams(FOnQuestObjectiveUpdated, int32, QuestID, int32, ObjectiveIndex);

/**
 * 任务管理器子系统
 * 负责管理所有任务的状态、进度和存档
 */
UCLASS()
class PROJECTFISH_API UQuestManager : public UGameInstanceSubsystem
{
	GENERATED_BODY()

public:
	virtual void Initialize(FSubsystemCollectionBase& Collection) override;
	virtual void Deinitialize() override;

	// ========== 任务操作 ==========
	/** 加载本地所有任务 */
	void LoadAllQuests();

	/** 检测所有可接收的任务 */
	UFUNCTION(BlueprintCallable, Category = "Quest")
	void CheckAcceptableQuests();
	
	/** 接受任务 */
	UFUNCTION(BlueprintCallable, Category = "Quest")
	bool AcceptQuest(UQuestAsset* QuestAsset);

	/** 接受任务 */
	UFUNCTION(BlueprintCallable, Category = "Quest")
	bool FollowQuest(int32 QuestID, bool Follow);

	/** 完成任务 */
	UFUNCTION(BlueprintCallable, Category = "Quest")
	bool CompleteQuest(int32 QuestID);

	/** 放弃任务 */
	UFUNCTION(BlueprintCallable, Category = "Quest")
	bool AbandonQuest(int32 QuestID);

	// ========== 任务进度 ==========

	/** 更新任务目标进度（收集物品、击败敌人、到达地点） */
	UFUNCTION(BlueprintCallable, Category = "Quest")
	void UpdateObjectiveProgress(int32 QuestID, int32 ObjectiveIndex, int32 Progress);

	/** 通过目标ID更新进度（自动查找对应目标） */
	UFUNCTION(BlueprintCallable, Category = "Quest")
	void UpdateObjectiveByTargetID(FName TargetID, int32 ProgressDelta = 1);

	// ========== 任务查询 ==========

	/** 获取任务状态 */
	UFUNCTION(BlueprintPure, Category = "Quest")
	EQuestState GetQuestState(int32 QuestID) const;

	/** 任务是否正在被追踪 */
	UFUNCTION(BlueprintPure, Category = "Quest")
	bool IsQuestFollowing(int32 QuestID) const;

	/** 获取所有进行中的任务 */
	UFUNCTION(BlueprintPure, Category = "Quest")
	TArray<UQuestAsset*> GetActiveQuests() const;

	/** 获取所有已完成的任务 */
	UFUNCTION(BlueprintPure, Category = "Quest")
	TArray<UQuestAsset*> GetCompletedQuests() const;

	/** 获取任务进度 */
	UFUNCTION(BlueprintPure, Category = "Quest")
	bool GetQuestProgress(int32 QuestID, TArray<FQuestProgress>& OutProgress) const;

	/** 检查是否可以接受任务（前置任务检查） */
	UFUNCTION(BlueprintPure, Category = "Quest")
	bool CanAcceptQuest(UQuestAsset* QuestAsset) const;

	// ========== 存档相关 ==========

	/** 获取所有任务的存档数据 */
	UFUNCTION(BlueprintCallable, Category = "Quest")
	TArray<FQuestSaveData> GetQuestSaveData() const;

	/** 从存档数据加载任务 */
	UFUNCTION(BlueprintCallable, Category = "Quest")
	void LoadFromSaveData(const TArray<FQuestSaveData>& SaveData);

	// ========== 事件 ==========

	/** 任务状态改变事件 */
	UPROPERTY(BlueprintAssignable, Category = "Quest|Events")
	FOnQuestStateChanged OnQuestStateChanged;

	/** 任务目标更新事件 */
	UPROPERTY(BlueprintAssignable, Category = "Quest|Events")
	FOnQuestObjectiveUpdated OnQuestObjectiveUpdated;

protected:
	/** 检查任务是否完成 */
	void CheckQuestCompletion(int32 QuestID);

	/** 初始化任务运行时数据 */
	FQuestRuntimeData CreateRuntimeData(UQuestAsset* QuestAsset);

private:
	/** 运行时任务数据映射 (QuestID -> RuntimeData) */
	UPROPERTY()
	TMap<int32, FQuestRuntimeData> ActiveQuestsMap;

	/** 正在追踪的任务列表 */
	UPROPERTY()
	TSet<int32> FollowingQuestIDs;

	/** 已完成的任务ID列表 */
	UPROPERTY()
	TSet<int32> CompletedQuestIDs;
	
	UPROPERTY()
	TArray<UQuestAsset*> QuestAssets;
};