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#pragma once


#include "Defines.h"
#include <functional>





// fwd:
class cBlockEntityWithItems;
class cBrewingstandEntity;
class cChunkDesc;
class cClientHandle;
class cCommandOutputCallback;
class cCraftingGrid;
class cCraftingRecipe;
class cEntity;
class cHopperEntity;
class cItems;
class cMonster;
class cPickup;
class cPlayer;
class cPlugin;
class cProjectileEntity;
class cWindow;
class cWorld;
class cSettingsRepositoryInterface;
class cDeadlockDetect;
struct TakeDamageInfo;

typedef std::shared_ptr<cPlugin> cPluginPtr;
typedef std::vector<cPluginPtr> cPluginPtrs;





// tolua_begin
class cPluginManager
{
public:

	enum CommandResult
	{
		crExecuted,
		crUnknownCommand,
		crError,
		crBlocked,
		crNoPermission,
	} ;


	/** Defines the status of a single plugin - whether it is loaded, disabled or errored. */
	enum ePluginStatus
	{
		/** The plugin has been loaded successfully. */
		psLoaded,

		/** The plugin is disabled in settings.ini. */
		psDisabled,

		/** The plugin is enabled in settings.ini but has been unloaded (by a command). */
		psUnloaded,

		/** The plugin is enabled in settings.ini but has failed to load.
		m_LoadError is the description of the error. */
		psError,

		/** The plugin has been loaded before, but after a folder refresh it is no longer present.
		The plugin will be unloaded in the next call to ReloadPlugins(). */
		psNotFound,
	};


	enum PluginHook
	{
		HOOK_BLOCK_SPREAD,
		HOOK_BLOCK_TO_PICKUPS,
		HOOK_BREWING_COMPLETING,
		HOOK_BREWING_COMPLETED,
		HOOK_CHAT,
		HOOK_CHUNK_AVAILABLE,
		HOOK_CHUNK_GENERATED,
		HOOK_CHUNK_GENERATING,
		HOOK_CHUNK_UNLOADED,
		HOOK_CHUNK_UNLOADING,
		HOOK_COLLECTING_PICKUP,
		HOOK_CRAFTING_NO_RECIPE,
		HOOK_DISCONNECT,
		HOOK_PLAYER_ANIMATION,
		HOOK_ENTITY_ADD_EFFECT,
		HOOK_ENTITY_CHANGING_WORLD,
		HOOK_ENTITY_CHANGED_WORLD,
		HOOK_EXECUTE_COMMAND,
		HOOK_EXPLODED,
		HOOK_EXPLODING,
		HOOK_HANDSHAKE,
		HOOK_HOPPER_PULLING_ITEM,
		HOOK_HOPPER_PUSHING_ITEM,
		HOOK_KILLED,
		HOOK_KILLING,
		HOOK_LOGIN,
		HOOK_LOGIN_FORGE,
		HOOK_PLAYER_BREAKING_BLOCK,
		HOOK_PLAYER_BROKEN_BLOCK,
		HOOK_PLAYER_DESTROYED,
		HOOK_PLAYER_EATING,
		HOOK_PLAYER_FISHED,
		HOOK_PLAYER_FISHING,
		HOOK_PLAYER_FOOD_LEVEL_CHANGE,
		HOOK_PLAYER_JOINED,
		HOOK_PLAYER_LEFT_CLICK,
		HOOK_PLAYER_MOVING,
		HOOK_PLAYER_OPENING_WINDOW,
		HOOK_PLAYER_PLACED_BLOCK,
		HOOK_PLAYER_PLACING_BLOCK,
		HOOK_PLAYER_RIGHT_CLICK,
		HOOK_PLAYER_RIGHT_CLICKING_ENTITY,
		HOOK_PLAYER_SHOOTING,
		HOOK_PLAYER_SPAWNED,
		HOOK_ENTITY_TELEPORT,
		HOOK_PLAYER_TOSSING_ITEM,
		HOOK_PLAYER_USED_BLOCK,
		HOOK_PLAYER_USED_ITEM,
		HOOK_PLAYER_USING_BLOCK,
		HOOK_PLAYER_USING_ITEM,
		HOOK_PLUGIN_MESSAGE,
		HOOK_PLUGINS_LOADED,
		HOOK_POST_CRAFTING,
		HOOK_PRE_CRAFTING,
		HOOK_PROJECTILE_HIT_BLOCK,
		HOOK_PROJECTILE_HIT_ENTITY,
		HOOK_SERVER_PING,
		HOOK_SPAWNED_ENTITY,
		HOOK_SPAWNED_MONSTER,
		HOOK_SPAWNING_ENTITY,
		HOOK_SPAWNING_MONSTER,
		HOOK_TAKE_DAMAGE,
		HOOK_TICK,
		HOOK_UPDATED_SIGN,
		HOOK_UPDATING_SIGN,
		HOOK_WEATHER_CHANGED,
		HOOK_WEATHER_CHANGING,
		HOOK_WORLD_STARTED,
		HOOK_WORLD_TICK,

		// tolua_end

		// Note that if a hook type is added, it may need processing in cPlugin::CanAddHook() descendants,
		//   and it definitely needs adding in cPluginLua::GetHookFnName() !

		// Keep these two as the last items, they are used for validity checking and get their values automagically
		HOOK_NUM_HOOKS,
		HOOK_MAX = HOOK_NUM_HOOKS - 1,
	} ;  // tolua_export


	/** Used as a callback for enumerating bound commands */
	class cCommandEnumCallback
	{
	public:
		virtual ~cCommandEnumCallback() {}

		/** Called for each command; return true to abort enumeration
		For console commands, a_Permission is not used (set to empty string)
		*/
		virtual bool Command(const AString & a_Command, const cPlugin * a_Plugin, const AString & a_Permission, const AString & a_HelpString) = 0;
	} ;


	/** Interface that must be provided by any class that implements a command handler, either in-game or console command. */
	class cCommandHandler
	{
	public:
		// Force a virtual destructor in descendants
		virtual ~cCommandHandler() {}

		/** Executes the specified in-game command.
		a_Split is the command string, split at the spaces.
		a_Player is the player executing the command, nullptr in case of the console.
		a_Command is the entire command string.
		a_Output is the sink into which the additional text returned by the command handler should be sent; only used for console commands. */
		virtual bool ExecuteCommand(
			const AStringVector & a_Split,
			cPlayer * a_Player,
			const AString & a_Command,
			cCommandOutputCallback * a_Output = nullptr
		) = 0;
	};

	typedef std::shared_ptr<cCommandHandler> cCommandHandlerPtr;


	/** The interface used for enumerating and extern-calling plugins */
	using cPluginCallback = std::function<bool(cPlugin &)>;

	typedef std::list<cPlugin *> PluginList;


	/** Called each tick, calls the plugins' OnTick hook, as well as processes plugin events (addition, removal) */
	void Tick(float a_Dt);

	/** Returns the instance of the Plugin Manager (there is only ever one) */
	static cPluginManager * Get(void);  // tolua_export

	/** Refreshes the m_Plugins list based on the current contents of the Plugins folder.
	If an active plugin's folder is not found anymore, the plugin is set as psNotFound, but not yet unloaded. */
	void RefreshPluginList();  // tolua_export

	/** Schedules a reload of the plugins to happen within the next call to Tick(). */
	void ReloadPlugins();  // tolua_export

	/** Adds the plugin to the list of plugins called for the specified hook type.
	If a plugin adds multiple handlers for a single hook, it is added only once (ignore-duplicates). */
	void AddHook(cPlugin * a_Plugin, int a_HookType);

	/** Returns the number of all plugins in m_Plugins (includes disabled, unloaded and errored plugins). */
	size_t GetNumPlugins() const;  // tolua_export

	/** Returns the number of plugins that are psLoaded. */
	size_t GetNumLoadedPlugins(void) const;  // tolua_export

	// Calls for individual hooks. Each returns false if the action is to continue or true if the plugin wants to abort
	bool CallHookBlockSpread              (cWorld & a_World, int a_BlockX, int a_BlockY, int a_BlockZ, eSpreadSource a_Source);
	bool CallHookBlockToPickups           (cWorld & a_World, cEntity * a_Digger, int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, cItems & a_Pickups);
	bool CallHookBrewingCompleting        (cWorld & a_World, cBrewingstandEntity & a_Brewingstand);
	bool CallHookBrewingCompleted         (cWorld & a_World, cBrewingstandEntity & a_Brewingstand);
	bool CallHookChat                     (cPlayer & a_Player, AString & a_Message);
	bool CallHookChunkAvailable           (cWorld & a_World, int a_ChunkX, int a_ChunkZ);
	bool CallHookChunkGenerated           (cWorld & a_World, int a_ChunkX, int a_ChunkZ, cChunkDesc * a_ChunkDesc);
	bool CallHookChunkGenerating          (cWorld & a_World, int a_ChunkX, int a_ChunkZ, cChunkDesc * a_ChunkDesc);
	bool CallHookChunkUnloaded            (cWorld & a_World, int a_ChunkX, int a_ChunkZ);
	bool CallHookChunkUnloading           (cWorld & a_World, int a_ChunkX, int a_ChunkZ);
	bool CallHookCollectingPickup         (cPlayer & a_Player, cPickup & a_Pickup);
	bool CallHookCraftingNoRecipe         (cPlayer & a_Player, cCraftingGrid & a_Grid, cCraftingRecipe & a_Recipe);
	bool CallHookDisconnect               (cClientHandle & a_Client, const AString & a_Reason);
	bool CallHookEntityAddEffect          (cEntity & a_Entity, int a_EffectType, int a_EffectDurationTicks, int a_EffectIntensity, double a_DistanceModifier);
	bool CallHookEntityTeleport           (cEntity & a_Entity, const Vector3d & a_OldPosition, const Vector3d & a_NewPosition);
	bool CallHookEntityChangingWorld      (cEntity & a_Entity, cWorld & a_World);
	bool CallHookEntityChangedWorld       (cEntity & a_Entity, cWorld & a_World);
	bool CallHookExecuteCommand           (cPlayer * a_Player, const AStringVector & a_Split, const AString & a_EntireCommand, CommandResult & a_Result);  // If a_Player == nullptr, it is a console cmd
	bool CallHookExploded                 (cWorld & a_World, double a_ExplosionSize,   bool a_CanCauseFire,   double a_X, double a_Y, double a_Z, eExplosionSource a_Source, void * a_SourceData);
	bool CallHookExploding                (cWorld & a_World, double & a_ExplosionSize, bool & a_CanCauseFire, double a_X, double a_Y, double a_Z, eExplosionSource a_Source, void * a_SourceData);
	bool CallHookHandshake                (cClientHandle & a_ClientHandle, const AString & a_Username);
	bool CallHookHopperPullingItem        (cWorld & a_World, cHopperEntity & a_Hopper, int a_DstSlotNum, cBlockEntityWithItems & a_SrcEntity, int a_SrcSlotNum);
	bool CallHookHopperPushingItem        (cWorld & a_World, cHopperEntity & a_Hopper, int a_SrcSlotNum, cBlockEntityWithItems & a_DstEntity, int a_DstSlotNum);
	bool CallHookKilled		      (cEntity & a_Victim, TakeDamageInfo & a_TDI, AString & a_DeathMessage);
	bool CallHookKilling                  (cEntity & a_Victim, cEntity * a_Killer, TakeDamageInfo & a_TDI);
	bool CallHookLogin                    (cClientHandle & a_Client, UInt32 a_ProtocolVersion, const AString & a_Username);
	bool CallHookLoginForge               (cClientHandle & a_Client, AStringMap & a_Mods);
	bool CallHookPlayerAnimation          (cPlayer & a_Player, int a_Animation);
	bool CallHookPlayerBreakingBlock      (cPlayer & a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta);
	bool CallHookPlayerBrokenBlock        (cPlayer & a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta);
	bool CallHookPlayerDestroyed          (cPlayer & a_Player);
	bool CallHookPlayerEating             (cPlayer & a_Player);
	bool CallHookPlayerFished             (cPlayer & a_Player, const cItems & a_Reward);
	bool CallHookPlayerFishing            (cPlayer & a_Player, cItems a_Reward);
	bool CallHookPlayerFoodLevelChange    (cPlayer & a_Player, int a_NewFoodLevel);
	bool CallHookPlayerJoined             (cPlayer & a_Player);
	bool CallHookPlayerLeftClick          (cPlayer & a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, char a_Status);
	bool CallHookPlayerMoving             (cPlayer & a_Player, const Vector3d & a_OldPosition, const Vector3d & a_NewPosition);
	bool CallHookPlayerOpeningWindow      (cPlayer & a_Player, cWindow & a_Window);
	bool CallHookPlayerPlacedBlock        (cPlayer & a_Player, const sSetBlock & a_BlockChange);
	bool CallHookPlayerPlacingBlock       (cPlayer & a_Player, const sSetBlock & a_BlockChange);
	bool CallHookPlayerRightClick         (cPlayer & a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ);
	bool CallHookPlayerRightClickingEntity(cPlayer & a_Player, cEntity & a_Entity);
	bool CallHookPlayerShooting           (cPlayer & a_Player);
	bool CallHookPlayerSpawned            (cPlayer & a_Player);
	bool CallHookPlayerTossingItem        (cPlayer & a_Player);
	bool CallHookPlayerUsedBlock          (cPlayer & a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta);
	bool CallHookPlayerUsedItem           (cPlayer & a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ);
	bool CallHookPlayerUsingBlock         (cPlayer & a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta);
	bool CallHookPlayerUsingItem          (cPlayer & a_Player, int a_BlockX, int a_BlockY, int a_BlockZ, char a_BlockFace, int a_CursorX, int a_CursorY, int a_CursorZ);
	bool CallHookPluginMessage            (cClientHandle & a_Client, const AString & a_Channel, const AString & a_Message);
	bool CallHookPluginsLoaded            (void);
	bool CallHookPostCrafting             (cPlayer & a_Player, cCraftingGrid & a_Grid, cCraftingRecipe & a_Recipe);
	bool CallHookPreCrafting              (cPlayer & a_Player, cCraftingGrid & a_Grid, cCraftingRecipe & a_Recipe);
	bool CallHookProjectileHitBlock       (cProjectileEntity & a_Projectile, int a_BlockX, int a_BlockY, int a_BlockZ, eBlockFace a_Face, const Vector3d & a_BlockHitPos);
	bool CallHookProjectileHitEntity      (cProjectileEntity & a_Projectile, cEntity & a_HitEntity);
	bool CallHookServerPing               (cClientHandle & a_ClientHandle, AString & a_ServerDescription, int & a_OnlinePlayersCount, int & a_MaxPlayersCount, AString & a_Favicon);
	bool CallHookSpawnedEntity            (cWorld & a_World, cEntity & a_Entity);
	bool CallHookSpawnedMonster           (cWorld & a_World, cMonster & a_Monster);
	bool CallHookSpawningEntity           (cWorld & a_World, cEntity & a_Entity);
	bool CallHookSpawningMonster          (cWorld & a_World, cMonster & a_Monster);
	bool CallHookTakeDamage               (cEntity & a_Receiver, TakeDamageInfo & a_TDI);
	bool CallHookUpdatedSign              (cWorld & a_World, int a_BlockX, int a_BlockY, int a_BlockZ, const AString & a_Line1, const AString & a_Line2, const AString & a_Line3, const AString & a_Line4, cPlayer * a_Player);
	bool CallHookUpdatingSign             (cWorld & a_World, int a_BlockX, int a_BlockY, int a_BlockZ,       AString & a_Line1,       AString & a_Line2,       AString & a_Line3,       AString & a_Line4, cPlayer * a_Player);
	bool CallHookWeatherChanged           (cWorld & a_World);
	bool CallHookWeatherChanging          (cWorld & a_World, eWeather & a_NewWeather);
	bool CallHookWorldStarted             (cWorld & a_World);
	bool CallHookWorldTick                (cWorld & a_World, std::chrono::milliseconds a_Dt, std::chrono::milliseconds a_LastTickDurationMSec);

	/** Queues the specified plugin to be unloaded in the next call to Tick().
	Note that this function returns before the plugin is unloaded, to avoid deadlocks. */
	void UnloadPlugin(const AString & a_PluginFolder);  // tolua_export

	/** Loads the plugin from the specified plugin folder.
	Returns true if the plugin was loaded successfully or was already loaded before, false otherwise. */
	bool LoadPlugin(const AString & a_PluginFolder);  // tolua_export

	/** Removes all hooks the specified plugin has registered */
	void RemoveHooks(cPlugin * a_Plugin);

	/** Removes the plugin of the specified name from the internal structures and deletes its object. */
	void RemovePlugin(const AString & a_PluginName);

	/** Removes all command bindings that the specified plugin has made */
	void RemovePluginCommands(cPlugin * a_Plugin);

	/** Returns true if the specified plugin is loaded. */
	bool IsPluginLoaded(const AString & a_PluginName);  // tolua_export

	/** Binds a command to the specified handler.
	Returns true if successful, false if command already bound.
	Exported in ManualBindings.cpp. */
	bool BindCommand(
		const AString & a_Command,
		cPlugin * a_Plugin,
		cCommandHandlerPtr a_Handler,
		const AString & a_Permission,
		const AString & a_HelpString
	);

	/** Calls a_Callback for each bound command, returns true if all commands were enumerated */
	bool ForEachCommand(cCommandEnumCallback & a_Callback);  // Exported in ManualBindings.cpp

	/** Returns true if the command is in the command map */
	bool IsCommandBound(const AString & a_Command);  // tolua_export

	/** Returns the permission needed for the specified command; empty string if command not found */
	AString GetCommandPermission(const AString & a_Command);  // tolua_export

	/** Executes the command, as if it was requested by a_Player. Checks permissions first. Returns crExecuted if executed. */
	CommandResult ExecuteCommand(cPlayer & a_Player, const AString & a_Command);  // tolua_export

	/** Executes the command, as if it was requested by a_Player. Permisssions are not checked. Returns crExecuted if executed. */
	CommandResult ForceExecuteCommand(cPlayer & a_Player, const AString & a_Command);  // tolua_export

	/** Removes all console command bindings that the specified plugin has made */
	void RemovePluginConsoleCommands(cPlugin * a_Plugin);

	/** Binds a console command to the specified handler.
	Returns true if successful, false if command already bound.
	Exported in ManualBindings.cpp. */
	bool BindConsoleCommand(
		const AString & a_Command,
		cPlugin * a_Plugin,
		cCommandHandlerPtr a_Handler,
		const AString & a_HelpString
	);

	/** Calls a_Callback for each bound console command, returns true if all commands were enumerated */
	bool ForEachConsoleCommand(cCommandEnumCallback & a_Callback);  // Exported in ManualBindings.cpp

	/** Returns true if the console command is in the command map */
	bool IsConsoleCommandBound(const AString & a_Command);  // tolua_export

	/** Executes the command split into a_Split, as if it was given on the console.
	Returns true if executed. Output is sent to the a_Output callback
	Exported in ManualBindings.cpp with a different signature. */
	bool ExecuteConsoleCommand(const AStringVector & a_Split, cCommandOutputCallback & a_Output, const AString & a_Command);

	/** Appends all commands beginning with a_Text (case-insensitive) into a_Results.
	If a_Player is not nullptr, only commands for which the player has permissions are added.
	*/
	void TabCompleteCommand(const AString & a_Text, AStringVector & a_Results, cPlayer * a_Player);

	/** Returns true if the specified hook type is within the allowed range */
	static bool IsValidHookType(int a_HookType);

	/** Calls the specified callback with the plugin object of the specified plugin.
	Returns false if plugin not found, otherwise returns the value that the callback has returned. */
	bool DoWithPlugin(const AString & a_PluginName, const cPluginCallback & a_Callback);

	/** Calls the specified callback for each plugin in m_Plugins.
	Returns true if all plugins have been reported, false if the callback has aborted the enumeration by returning true. */
	bool ForEachPlugin(const cPluginCallback & a_Callback);

	/** Returns the name of the folder (cPlugin::GetFolderName()) from which the specified plugin was loaded. */
	AString GetPluginFolderName(const AString & a_PluginName);  // tolua_export

	/** Returns the path where individual plugins' folders are expected.
	The path doesn't end in a slash. */
	static AString GetPluginsPath(void) { return FILE_IO_PREFIX "Plugins"; }  // tolua_export

private:
	friend class cRoot;

	class cCommandReg
	{
	public:
		cPlugin * m_Plugin;
		AString   m_Permission;  // Not used for console commands
		AString   m_HelpString;
		cCommandHandlerPtr m_Handler;
	} ;

	typedef std::map<int, cPluginManager::PluginList> HookMap;
	typedef std::map<AString, cCommandReg> CommandMap;


	/** FolderNames of plugins that should be unloaded.
	The plugins will be unloaded within the next call to Tick(), to avoid multithreading issues.
	Protected against multithreaded access by m_CSPluginsToUnload. */
	AStringVector m_PluginsToUnload;

	/** Protects m_PluginsToUnload against multithreaded access. */
	mutable cCriticalSection m_CSPluginsToUnload;

	/** All plugins that have been found in the Plugins folder. */
	cPluginPtrs m_Plugins;

	HookMap    m_Hooks;
	CommandMap m_Commands;
	CommandMap m_ConsoleCommands;

	/** If set to true, all the plugins will be reloaded within the next call to Tick(). */
	bool m_bReloadPlugins;

	/** The deadlock detect in which all plugins should track their CSs. */
	cDeadlockDetect & m_DeadlockDetect;


	cPluginManager(cDeadlockDetect & a_DeadlockDetect);
	virtual ~cPluginManager();

	/** Reloads all plugins, defaulting to settings.ini for settings location */
	void ReloadPluginsNow(void);

	/** Reloads all plugins with a settings repo expected to be initialised to settings.ini */
	void ReloadPluginsNow(cSettingsRepositoryInterface & a_Settings);

	/** Unloads all plugins */
	void UnloadPluginsNow(void);

	/** Handles writing default plugins if 'Plugins' key not found using a settings repo expected to be intialised to settings.ini */
	void InsertDefaultPlugins(cSettingsRepositoryInterface & a_Settings);

	/** Tries to match a_Command to the internal table of commands, if a match is found, the corresponding plugin is called. Returns crExecuted if the command is executed. */
	CommandResult HandleCommand(cPlayer & a_Player, const AString & a_Command, bool a_ShouldCheckPermissions);

	/** Returns the folders that are specified in the settings ini to load plugins from. */
	AStringVector GetFoldersToLoad(cSettingsRepositoryInterface & a_Settings);
} ;  // tolua_export