/* Copyright (C) 2019 Mr Goldberg
   This file is part of the Goldberg Emulator

   The Goldberg Emulator is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 3 of the License, or (at your option) any later version.

   The Goldberg Emulator is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the Goldberg Emulator; if not, see
   <http://www.gnu.org/licenses/>.  */

#ifndef __INCLUDED_STEAM_USER_STATS_H__
#define __INCLUDED_STEAM_USER_STATS_H__

#include "base.h"

#include <iomanip>
#include <fstream>
#include "../json/json.hpp"

struct Steam_Leaderboard {
    std::string name;
    ELeaderboardSortMethod sort_method;
    ELeaderboardDisplayType display_type;
};

class Steam_User_Stats :
    public ISteamUserStats003,
    public ISteamUserStats004,
    public ISteamUserStats005,
    public ISteamUserStats006,
    public ISteamUserStats007,
    public ISteamUserStats008,
    public ISteamUserStats009,
    public ISteamUserStats010,
    public ISteamUserStats
{
public:
    static constexpr auto achievements_user_file = "achievements.json";

private:

    Local_Storage* local_storage;
    Settings* settings;
    SteamCallResults* callback_results;
    class SteamCallBacks* callbacks;
    std::vector<struct Steam_Leaderboard> leaderboards;

    nlohmann::json defined_achievements;
    nlohmann::json user_achievements;

    unsigned int find_leaderboard(std::string name);

    void load_achievements_db();
    void load_achievements();
    void save_achievements();

public:
    Steam_User_Stats(Settings* settings, Local_Storage* local_storage, class SteamCallResults* callback_results, class SteamCallBacks* callbacks);

    nlohmann::json const& GetAchievementsDb() const;

    // Ask the server to send down this user's data and achievements for this game
    STEAM_CALL_BACK(UserStatsReceived_t)
        bool RequestCurrentStats();

    // Data accessors
    bool GetStat(const char* pchName, int32* pData);
    bool GetStat(const char* pchName, float* pData);

    // Set / update data
    bool SetStat(const char* pchName, int32 nData);
    bool SetStat(const char* pchName, float fData);
    bool UpdateAvgRateStat(const char* pchName, float flCountThisSession, double dSessionLength);

    // Achievement flag accessors
    bool GetAchievement(const char* pchName, bool* pbAchieved);
    bool SetAchievement(const char* pchName);
    bool ClearAchievement(const char* pchName);


    // Get the achievement status, and the time it was unlocked if unlocked.
    // If the return value is true, but the unlock time is zero, that means it was unlocked before Steam 
    // began tracking achievement unlock times (December 2009). Time is seconds since January 1, 1970.
    bool GetAchievementAndUnlockTime(const char* pchName, bool* pbAchieved, uint32* punUnlockTime);

    // Store the current data on the server, will get a callback when set
    // And one callback for every new achievement
    //
    // If the callback has a result of k_EResultInvalidParam, one or more stats 
    // uploaded has been rejected, either because they broke constraints
    // or were out of date. In this case the server sends back updated values.
    // The stats should be re-iterated to keep in sync.
    bool StoreStats();

    // Achievement / GroupAchievement metadata

    // Gets the icon of the achievement, which is a handle to be used in ISteamUtils::GetImageRGBA(), or 0 if none set. 
    // A return value of 0 may indicate we are still fetching data, and you can wait for the UserAchievementIconFetched_t callback
    // which will notify you when the bits are ready. If the callback still returns zero, then there is no image set for the
    // specified achievement.
    int GetAchievementIcon(const char* pchName);


    // Get general attributes for an achievement. Accepts the following keys:
    // - "name" and "desc" for retrieving the localized achievement name and description (returned in UTF8)
    // - "hidden" for retrieving if an achievement is hidden (returns "0" when not hidden, "1" when hidden)
    const char* GetAchievementDisplayAttribute(const char* pchName, const char* pchKey);

    // Achievement progress - triggers an AchievementProgress callback, that is all.
    // Calling this w/ N out of N progress will NOT set the achievement, the game must still do that.
    bool IndicateAchievementProgress(const char* pchName, uint32 nCurProgress, uint32 nMaxProgress);

    // Used for iterating achievements. In general games should not need these functions because they should have a
    // list of existing achievements compiled into them
    uint32 GetNumAchievements();

    // Get achievement name iAchievement in [0,GetNumAchievements)
    const char* GetAchievementName(uint32 iAchievement);

    // Friends stats & achievements

    // downloads stats for the user
    // returns a UserStatsReceived_t received when completed
    // if the other user has no stats, UserStatsReceived_t.m_eResult will be set to k_EResultFail
    // these stats won't be auto-updated; you'll need to call RequestUserStats() again to refresh any data
    STEAM_CALL_RESULT(UserStatsReceived_t)
        SteamAPICall_t RequestUserStats(CSteamID steamIDUser);


    // requests stat information for a user, usable after a successful call to RequestUserStats()
    bool GetUserStat(CSteamID steamIDUser, const char* pchName, int32* pData);
    bool GetUserStat(CSteamID steamIDUser, const char* pchName, float* pData);

    bool GetUserAchievement(CSteamID steamIDUser, const char* pchName, bool* pbAchieved);

    // See notes for GetAchievementAndUnlockTime above
    bool GetUserAchievementAndUnlockTime(CSteamID steamIDUser, const char* pchName, bool* pbAchieved, uint32* punUnlockTime);

    // Reset stats 
    bool ResetAllStats(bool bAchievementsToo);

    // Leaderboard functions

    // asks the Steam back-end for a leaderboard by name, and will create it if it's not yet
    // This call is asynchronous, with the result returned in LeaderboardFindResult_t
    STEAM_CALL_RESULT(LeaderboardFindResult_t)
        SteamAPICall_t FindOrCreateLeaderboard(const char* pchLeaderboardName, ELeaderboardSortMethod eLeaderboardSortMethod, ELeaderboardDisplayType eLeaderboardDisplayType);

    // as above, but won't create the leaderboard if it's not found
    // This call is asynchronous, with the result returned in LeaderboardFindResult_t
    STEAM_CALL_RESULT(LeaderboardFindResult_t)
        SteamAPICall_t FindLeaderboard(const char* pchLeaderboardName);

    // returns the name of a leaderboard
    const char* GetLeaderboardName(SteamLeaderboard_t hSteamLeaderboard);

    // returns the total number of entries in a leaderboard, as of the last request
    int GetLeaderboardEntryCount(SteamLeaderboard_t hSteamLeaderboard);

    // returns the sort method of the leaderboard
    ELeaderboardSortMethod GetLeaderboardSortMethod(SteamLeaderboard_t hSteamLeaderboard);

    // returns the display type of the leaderboard
    ELeaderboardDisplayType GetLeaderboardDisplayType(SteamLeaderboard_t hSteamLeaderboard);

    // Asks the Steam back-end for a set of rows in the leaderboard.
    // This call is asynchronous, with the result returned in LeaderboardScoresDownloaded_t
    // LeaderboardScoresDownloaded_t will contain a handle to pull the results from GetDownloadedLeaderboardEntries() (below)
    // You can ask for more entries than exist, and it will return as many as do exist.
    // k_ELeaderboardDataRequestGlobal requests rows in the leaderboard from the full table, with nRangeStart & nRangeEnd in the range [1, TotalEntries]
    // k_ELeaderboardDataRequestGlobalAroundUser requests rows around the current user, nRangeStart being negate
    //   e.g. DownloadLeaderboardEntries( hLeaderboard, k_ELeaderboardDataRequestGlobalAroundUser, -3, 3 ) will return 7 rows, 3 before the user, 3 after
    // k_ELeaderboardDataRequestFriends requests all the rows for friends of the current user 
    STEAM_CALL_RESULT(LeaderboardScoresDownloaded_t)
        SteamAPICall_t DownloadLeaderboardEntries(SteamLeaderboard_t hSteamLeaderboard, ELeaderboardDataRequest eLeaderboardDataRequest, int nRangeStart, int nRangeEnd);

    // as above, but downloads leaderboard entries for an arbitrary set of users - ELeaderboardDataRequest is k_ELeaderboardDataRequestUsers
    // if a user doesn't have a leaderboard entry, they won't be included in the result
    // a max of 100 users can be downloaded at a time, with only one outstanding call at a time
    STEAM_METHOD_DESC(Downloads leaderboard entries for an arbitrary set of users - ELeaderboardDataRequest is k_ELeaderboardDataRequestUsers)
        STEAM_CALL_RESULT(LeaderboardScoresDownloaded_t)
        SteamAPICall_t DownloadLeaderboardEntriesForUsers(SteamLeaderboard_t hSteamLeaderboard,
            STEAM_ARRAY_COUNT_D(cUsers, Array of users to retrieve) CSteamID* prgUsers, int cUsers);

    // Returns data about a single leaderboard entry
    // use a for loop from 0 to LeaderboardScoresDownloaded_t::m_cEntryCount to get all the downloaded entries
    // e.g.
    //		void OnLeaderboardScoresDownloaded( LeaderboardScoresDownloaded_t *pLeaderboardScoresDownloaded )
    //		{
    //			for ( int index = 0; index < pLeaderboardScoresDownloaded->m_cEntryCount; index++ )
    //			{
    //				LeaderboardEntry_t leaderboardEntry;
    //				int32 details[3];		// we know this is how many we've stored previously
    //				GetDownloadedLeaderboardEntry( pLeaderboardScoresDownloaded->m_hSteamLeaderboardEntries, index, &leaderboardEntry, details, 3 );
    //				assert( leaderboardEntry.m_cDetails == 3 );
    //				...
    //			}
    // once you've accessed all the entries, the data will be free'd, and the SteamLeaderboardEntries_t handle will become invalid
    bool GetDownloadedLeaderboardEntry(SteamLeaderboardEntries_t hSteamLeaderboardEntries, int index, LeaderboardEntry_t* pLeaderboardEntry, int32* pDetails, int cDetailsMax);

    // Uploads a user score to the Steam back-end.
    // This call is asynchronous, with the result returned in LeaderboardScoreUploaded_t
    // Details are extra game-defined information regarding how the user got that score
    // pScoreDetails points to an array of int32's, cScoreDetailsCount is the number of int32's in the list
    STEAM_CALL_RESULT(LeaderboardScoreUploaded_t)
        SteamAPICall_t UploadLeaderboardScore(SteamLeaderboard_t hSteamLeaderboard, ELeaderboardUploadScoreMethod eLeaderboardUploadScoreMethod, int32 nScore, const int32* pScoreDetails, int cScoreDetailsCount);

    SteamAPICall_t UploadLeaderboardScore(SteamLeaderboard_t hSteamLeaderboard, int32 nScore, int32* pScoreDetails, int cScoreDetailsCount);

    // Attaches a piece of user generated content the user's entry on a leaderboard.
    // hContent is a handle to a piece of user generated content that was shared using ISteamUserRemoteStorage::FileShare().
    // This call is asynchronous, with the result returned in LeaderboardUGCSet_t.
    STEAM_CALL_RESULT(LeaderboardUGCSet_t)
        SteamAPICall_t AttachLeaderboardUGC(SteamLeaderboard_t hSteamLeaderboard, UGCHandle_t hUGC);

    // Retrieves the number of players currently playing your game (online + offline)
    // This call is asynchronous, with the result returned in NumberOfCurrentPlayers_t
    STEAM_CALL_RESULT(NumberOfCurrentPlayers_t)
        SteamAPICall_t GetNumberOfCurrentPlayers();

    // Requests that Steam fetch data on the percentage of players who have received each achievement
    // for the game globally.
    // This call is asynchronous, with the result returned in GlobalAchievementPercentagesReady_t.
    STEAM_CALL_RESULT(GlobalAchievementPercentagesReady_t)
        SteamAPICall_t RequestGlobalAchievementPercentages();

    // Get the info on the most achieved achievement for the game, returns an iterator index you can use to fetch
    // the next most achieved afterwards.  Will return -1 if there is no data on achievement 
    // percentages (ie, you haven't called RequestGlobalAchievementPercentages and waited on the callback).
    int GetMostAchievedAchievementInfo(char* pchName, uint32 unNameBufLen, float* pflPercent, bool* pbAchieved);

    // Get the info on the next most achieved achievement for the game. Call this after GetMostAchievedAchievementInfo or another
    // GetNextMostAchievedAchievementInfo call passing the iterator from the previous call. Returns -1 after the last
    // achievement has been iterated.
    int GetNextMostAchievedAchievementInfo(int iIteratorPrevious, char* pchName, uint32 unNameBufLen, float* pflPercent, bool* pbAchieved);

    // Returns the percentage of users who have achieved the specified achievement.
    bool GetAchievementAchievedPercent(const char* pchName, float* pflPercent);

    // Requests global stats data, which is available for stats marked as "aggregated".
    // This call is asynchronous, with the results returned in GlobalStatsReceived_t.
    // nHistoryDays specifies how many days of day-by-day history to retrieve in addition
    // to the overall totals. The limit is 60.
    STEAM_CALL_RESULT(GlobalStatsReceived_t)
        SteamAPICall_t RequestGlobalStats(int nHistoryDays);

    // Gets the lifetime totals for an aggregated stat
    bool GetGlobalStat(const char* pchStatName, int64* pData);
    bool GetGlobalStat(const char* pchStatName, double* pData);

    // Gets history for an aggregated stat. pData will be filled with daily values, starting with today.
    // So when called, pData[0] will be today, pData[1] will be yesterday, and pData[2] will be two days ago, 
    // etc. cubData is the size in bytes of the pubData buffer. Returns the number of 
    // elements actually set.
    int32 GetGlobalStatHistory(const char* pchStatName, STEAM_ARRAY_COUNT(cubData) int64* pData, uint32 cubData);
    int32 GetGlobalStatHistory(const char* pchStatName, STEAM_ARRAY_COUNT(cubData) double* pData, uint32 cubData);
};

#endif//__INCLUDED_STEAM_USER_STATS_H__