/**
 * @file frd.h
 * @brief Friend Services
 */
#pragma once
#include <3ds/mii.h>

#define FRIEND_SCREEN_NAME_SIZE 0xB   ///< 11-byte UTF-16 screen name
#define FRIEND_COMMENT_SIZE 0x21      ///< 33-byte UTF-16 comment
#define FRIEND_LIST_SIZE 0x64         ///< 100 (Max number of friends)

#pragma pack(push, 1)

/// Friend key data
typedef struct
{
	u32 principalId;
	u32 padding;
	u64 localFriendCode;
} FriendKey;

/// Friend Title data
typedef struct
{
	u64 tid;
	u32 version;
	u32 unk;
} TitleData;

/// Friend profile data
typedef struct
{
	u8 region;      ///< The region code for the hardware.
	u8 country;     ///< Country code.
	u8 area;        ///< Area code.
	u8 language;    ///< Language code.
	u8 platform;    ///< Platform code.
	u32 padding;
} FriendProfile;

/// Game Description structure
typedef struct
{
	TitleData data;
	u16 desc[128];
} GameDescription;

/// Friend Notification Event structure
typedef struct
{
	u8 type;
	u8 padding3[3];
	u32 padding;
	FriendKey key;
} NotificationEvent;

#pragma pack(pop)

/// Enum to use with FRD_GetNotificationEvent
typedef enum 
{
	USER_WENT_ONLINE = 1,     ///< Self went online
	USER_WENT_OFFLINE,        ///< Self went offline
	FRIEND_WENT_ONLINE,       ///< Friend Went Online 
	FRIEND_UPDATED_PRESENCE,  ///< Friend Presence changed
	FRIEND_UPDATED_MII,       ///< Friend Mii changed
	FRIEND_UPDATED_PROFILE,   ///< Friend Profile changed
	FRIEND_WENT_OFFLINE,      ///< Friend went offline
	FRIEND_REGISTERED_USER,   ///< Friend registered self as friend
	FRIEND_SENT_INVITATION    ///< Friend Sent invitation
} NotificationTypes;

/// Initializes FRD service.
Result frdInit(void);

/// Exists FRD.
void frdExit(void);

/// Get FRD handle.
Handle *frdGetSessionHandle(void);
/**
 * @brief Gets the login status of the current user.
 * @param state Pointer to write the current user's login status to.
 */
Result FRDU_HasLoggedIn(bool *state);

/**
 * @brief Gets the online status of the current user.
 * @param state Pointer to write the current user's online status to.
 */
Result FRDU_IsOnline(bool *state);

/// Logs out of Nintendo's friend server.
Result FRD_Logout(void);

/**
 * @brief Log in to Nintendo's friend server.
 * @param event Event to signal when Login is done.
 */
Result FRD_Login(Handle event);

/**
 * @brief Gets the current user's friend key.
 * @param key Pointer to write the current user's friend key to.
 */
Result FRD_GetMyFriendKey(FriendKey *key);

/**
 * @brief Gets the current user's privacy information.
 * @param isPublicMode Determines whether friends are notified of the current user's online status.
 * @param isShowGameName Determines whether friends are notified of the application that the current user is running.
 * @param isShowPlayedGame Determiens whether to display the current user's game history.
 */
Result FRD_GetMyPreference(bool *isPublicMode, bool *isShowGameName, bool *isShowPlayedGame);

/**
 * @brief Gets the current user's profile information.
 * @param profile Pointer to write the current user's profile information to.
 */
Result FRD_GetMyProfile(FriendProfile *profile);

/**
 * @brief Gets the current user's screen name.
 * @param name Pointer to write the current user's screen name to.
 * @param max_size Max size of the screen name.
 */
Result FRD_GetMyScreenName(char *name, size_t max_size);

/**
 * @brief Gets the current user's Mii data.
 * @param mii Pointer to write the current user's mii data to.
 */
Result FRD_GetMyMii(MiiData *mii);

/**
 * @brief Gets the current user's playing game.
 * @param titleId Pointer to write the current user's playing game to.
 */
Result FRD_GetMyPlayingGame(u64 *titleId);

/**
 * @brief Gets the current user's favourite game.
 * @param titleId Pointer to write the title ID of current user's favourite game to.
 */
Result FRD_GetMyFavoriteGame(u64 *titleId);

/**
 * @brief Gets the current user's comment on their friend profile.
 * @param comment Pointer to write the current user's comment to.
 * @param max_size Max size of the comment.
 */
Result FRD_GetMyComment(char *comment, size_t max_size);

/**
 * @brief Gets the current user's friend key list.
 * @param friendKeyList Pointer to write the friend key list to.
 * @param num Stores the number of friend keys obtained.
 * @param offset The index of the friend key to start with.
 * @param size Size of the friend key list. (FRIEND_LIST_SIZE)
 */
Result FRD_GetFriendKeyList(FriendKey *friendKeyList, u32 *num, u32 offset, u32 size);

/**
 * @brief Gets the current user's friends' Mii data.
 * @param miiDataList Pointer to write Mii data to.
 * @param friendKeyList Pointer to FriendKeys.
 * @param size Number of Friendkeys.
 */
Result FRD_GetFriendMii(MiiData *miiDataList, const FriendKey *friendKeyList, size_t size);

/**
 * @brief Get the current user's friends' profile data.
 * @param profile Pointer to write profile data to.
 * @param friendKeyList Pointer to FriendKeys.
 * @param size Number of FriendKeys.
 */
Result FRD_GetFriendProfile(FriendProfile *profile, const FriendKey *friendKeyList, size_t size);

/**
 * @brief Get the current user's friends' playing game.
 * @param desc Pointer to write Game Description data to.
 * @param friendKeyList Pointer to FriendKeys,
 * @param size Number Of FriendKeys.
 */
Result FRD_GetFriendPlayingGame(GameDescription *desc, const FriendKey *friendKeyList, size_t size);

/**
 * @brief Get the current user's friends' favourite game.
 * @param desc Pointer to write Game Description data to.
 * @param friendKeyList Pointer to FriendKeys,
 * @param count Number Of FriendKeys.
 */
Result FRD_GetFriendFavouriteGame(GameDescription *desc, const FriendKey *friendKeyList, u32 count);

/**
 * @brief Gets whether a friend key is included in the current user's friend list.
 * @param friendKeyList Pointer to a list of friend keys.
 * @param isFromList Pointer to a write the friendship status to.
 */
Result FRD_IsInFriendList(FriendKey *friendKeyList, bool *isFromList);

/**
 * @brief Updates the game mode description string.
 * @param desc Pointer to write the game mode description to.
 */
Result FRD_UpdateGameModeDescription(const char *desc);

/**
 * @brief Event which is signaled when friend login states change.
 * @param event event which will be signaled.
 */
Result FRD_AttachToEventNotification(Handle event);

/**
 * @brief Get Latest Event Notification
 * @param event Pointer to write recieved notification event struct to.
 * @param count Number of events
 * @param recievedNotifCount Number of notification reccieved.
 */
Result FRD_GetEventNotification(NotificationEvent *event, u32 count, u32 *recievedNotifCount); 

/**
 * @brief Returns the friend code using the given principal ID.
 * @param principalId The principal ID being used.
 * @param friendCode Pointer to write the friend code to.
 */
Result FRD_PrincipalIdToFriendCode(u32 principalId, u64 *friendCode);

/**
 * @brief Returns the principal ID using the given friend code.
 * @param friendCode The friend code being used.
 * @param principalId Pointer to write the principal ID to.
 */
Result FRD_FriendCodeToPrincipalId(u64 friendCode, u32 *principalId);

/**
 * @brief Checks if the friend code is valid.
 * @param friendCode The friend code being used.
 * @param isValid Pointer to write the validity of the friend code to.
 */
Result FRD_IsValidFriendCode(u64 friendCode, bool *isValid);

/**
 * @brief Sets the Friend API to use a specific SDK version.
 * @param sdkVer The SDK version needed to be used.
 */
Result FRD_SetClientSdkVersion(u32 sdkVer);

/**
 * @brief Add a Friend online.
 * @param event Event signaled when friend is registered.
 * @param principalId PrincipalId of the friend to add.
 */
Result FRD_AddFriendOnline(Handle event, u32 principalId);

/**
 * @brief Remove a Friend.
 * @param principalId PrinipalId of the friend code to remove.
 * @param localFriendCode LocalFriendCode of the friend code to remove.
 */
Result FRD_RemoveFriend(u32 principalId, u64 localFriendCode);