//////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004-2021 musikcube team
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//    * Redistributions of source code must retain the above copyright notice,
//      this list of conditions and the following disclaimer.
//
//    * Redistributions in binary form must reproduce the above copyright
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// POSSIBILITY OF SUCH DAMAGE.
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//////////////////////////////////////////////////////////////////////////////

#include "pch.hpp"
#include "LocalMetadataProxy.h"

#include <musikcore/debug.h>
#include <musikcore/db/ScopedTransaction.h>
#include <musikcore/library/query/AlbumListQuery.h>
#include <musikcore/library/query/AllCategoriesQuery.h>
#include <musikcore/library/query/AppendPlaylistQuery.h>
#include <musikcore/library/query/CategoryListQuery.h>
#include <musikcore/library/query/CategoryTrackListQuery.h>
#include <musikcore/library/query/DeletePlaylistQuery.h>
#include <musikcore/library/query/SearchTrackListQuery.h>
#include <musikcore/library/query/GetPlaylistQuery.h>
#include <musikcore/library/query/SavePlaylistQuery.h>
#include <musikcore/library/query/TrackMetadataQuery.h>
#include <musikcore/library/query/TrackListQueryBase.h>
#include <musikcore/library/QueryRegistry.h>
#include <musikcore/library/LibraryFactory.h>
#include <musikcore/library/track/LibraryTrack.h>
#include <musikcore/library/LocalLibraryConstants.h>
#include <musikcore/runtime/Message.h>
#include <musikcore/support/Messages.h>
#include <musikcore/support/Common.h>
#include <vector>
#include <map>

#pragma warning(push, 0)
#include <nlohmann/json.hpp>
#pragma warning(pop)

#define TAG "LocalMetadataProxy"

using namespace musik::core;
using namespace musik::core::db;
using namespace musik::core::library::query;
using namespace musik::core::library;
using namespace musik::core::runtime;
using namespace musik::core::sdk;

using PredicateList = musik::core::library::query::category::PredicateList;

/* HELPERS */

#ifdef __APPLE__
static __thread char threadLocalBuffer[4096];
#else
static thread_local char threadLocalBuffer[4096];
#endif

static inline std::string getValue(IValue* value) {
    threadLocalBuffer[0] = 0;
    if (value->GetValue(threadLocalBuffer, sizeof(threadLocalBuffer))) {
        return std::string(threadLocalBuffer);
    }
    return "";
}

static inline PredicateList toPredicateList(IValue** predicates, size_t count) {
    PredicateList predicateList;
    if (predicates && count) {
        for (size_t i = 0; i < count; i++) {
            auto predicate = predicates[i];
            if (predicate) {
                predicateList.push_back({ getValue(predicate), predicate->GetId() });
            }
        }
    }
    return predicateList;
}

/* QUERIES */

class ExternalIdListToTrackListQuery : public TrackListQueryBase {
    public:
        ExternalIdListToTrackListQuery(
            ILibraryPtr library,
            const char** externalIds,
            size_t externalIdCount)
        {
            this->library = library;
            this->externalIds = externalIds;
            this->externalIdCount = externalIdCount;
        }

        std::shared_ptr<TrackList> GetResult() noexcept override {
            return this->result;
        }

        Headers GetHeaders() noexcept override {
            return Headers();
        }

        Durations GetDurations() noexcept override {
            return Durations();
        }

        size_t GetQueryHash() noexcept override {
            return 0;
        }

    protected:
         bool OnRun(musik::core::db::Connection& db) override {
            std::string sql = "SELECT id, external_id FROM tracks WHERE external_id IN(";
            for (size_t i = 0; i < externalIdCount; i++) {
                sql += (i == 0) ? "?" : ",?";
            }
            sql += ");";

            Statement query(sql.c_str(), db);

            for (size_t i = 0; i < externalIdCount; i++) {
                query.BindText((int) i, externalIds[i]);
            }

            /* gotta eat up some memory to preserve the input order. map the
            external id to the id so we can ensure we return the list in the
            same order it was requested. this is faster than executing one
            query per ID (we do this because WHERE IN() does not preserve input
            ordering... */
            struct Record { int64_t id; std::string externalId; };
            std::map<std::string, int64_t> records;

            while (query.Step() == Row) {
                records[query.ColumnText(1)] = query.ColumnInt64(0);
            }

            /* order the output here... */
            this->result = std::make_shared<TrackList>(this->library);
            auto end = records.end();
            for (size_t i = 0; i < externalIdCount; i++) {
                auto r = records.find(externalIds[i]);
                if (r != end) {
                    this->result->Add(r->second);
                }
            }

            return true;
        }

        std::string Name() override {
            return "ExternalIdListToTrackListQuery";
        }

    private:
        ILibraryPtr library;
        const char** externalIds;
        size_t externalIdCount;
        std::shared_ptr<TrackList> result;
};

class RemoveFromPlaylistQuery : public QueryBase {
    public:
        RemoveFromPlaylistQuery(
            ILibraryPtr library,
            int64_t playlistId,
            const char** externalIds,
            const int* sortOrders,
            size_t count)
        {
            this->library = library;
            this->playlistId = playlistId;
            this->externalIds = externalIds;
            this->sortOrders = sortOrders;
            this->count = count;
            this->updated = 0;
        }

        size_t GetResult() noexcept {
            return this->updated;
        }

    protected:
        bool OnRun(musik::core::db::Connection& db) override {
            this->updated = 0;

            ScopedTransaction transaction(db);

            {
                Statement deleteStmt(
                    "DELETE FROM playlist_tracks "
                    "WHERE playlist_id=? AND track_external_id=? AND sort_order=?",
                    db);

                for (size_t i = 0; i < count; i++) {
                    const auto id = this->externalIds[i];
                    const auto o = this->sortOrders[i];

                    deleteStmt.ResetAndUnbind();
                    deleteStmt.BindInt64(0, this->playlistId);
                    deleteStmt.BindText(1, this->externalIds[i]);
                    deleteStmt.BindInt32(2, this->sortOrders[i]);
                    if (deleteStmt.Step() == Done) {
                        ++this->updated;
                    }
                }
            }

            bool error = false;

            {
                Statement playlistTracks(
                    "SELECT track_external_id, sort_order FROM playlist_tracks "
                    "WHERE playlist_id=? ORDER BY sort_order ASC",
                    db);

                Statement updateStmt(
                    "UPDATE playlist_tracks "
                    "SET sort_order=? "
                    "WHERE playlist_id=? AND track_external_id=? AND sort_order=?",
                    db);

                int order = 0;

                playlistTracks.BindInt64(0, this->playlistId);
                while (playlistTracks.Step() == Row) {
                    updateStmt.ResetAndUnbind();
                    updateStmt.BindInt32(0, order++);
                    updateStmt.BindInt64(1, this->playlistId);
                    updateStmt.BindText(2, playlistTracks.ColumnText(0));
                    updateStmt.BindInt32(3, playlistTracks.ColumnInt32(1));
                    if (updateStmt.Step() != Done) {
                        error = true;
                        break;
                    }
                }
            }

            if (!error) {
                transaction.CommitAndRestart();
            }
            else {
                this->updated = 0;
            }

            if (this->updated > 0) {
                this->library->GetMessageQueue().Broadcast(
                    Message::Create(nullptr, message::PlaylistModified, playlistId));
            }

            return true;
        }

        std::string Name() override {
            return "RemoveFromPlaylistQuery";
        }

    private:
        ILibraryPtr library;
        int64_t playlistId;
        const char** externalIds;
        const int* sortOrders;
        size_t count;
        size_t updated;
        std::shared_ptr<TrackList> result;
};

/* DATA PROVIDER */

LocalMetadataProxy::LocalMetadataProxy(musik::core::ILibraryPtr library)
: library(library) {

}

void LocalMetadataProxy::Release() noexcept {
    delete this;
}

ITrackList* LocalMetadataProxy::QueryTracks(const char* query, int limit, int offset) {
    try {
        auto search = std::make_shared<SearchTrackListQuery>(
            this->library,
            SearchTrackListQuery::MatchType::Substring,
            std::string(query ? query : ""),
            TrackSortType::Album);

        if (limit >= 0) {
            search->SetLimitAndOffset(limit, offset);
        }

        this->library->EnqueueAndWait(search);

        if (search->GetStatus() == IQuery::Finished) {
            return search->GetSdkResult();
        }
    }
    catch (...) {
        musik::debug::error(TAG, "QueryTracks failed");
    }

    return nullptr;
}

ITrack* LocalMetadataProxy::QueryTrackById(int64_t trackId) {
    try {
        const auto target = std::make_shared<LibraryTrack>(trackId, this->library);
        const auto search = std::make_shared<TrackMetadataQuery>(target, this->library);
        this->library->EnqueueAndWait(search);
        if (search->GetStatus() == IQuery::Finished) {
            return search->Result()->GetSdkValue();
        }
    }
    catch (...) {
        musik::debug::error(TAG, "QueryTrackById failed");
    }

    return nullptr;
}

ITrack* LocalMetadataProxy::QueryTrackByExternalId(const char* externalId) {
    if (strlen(externalId)) {
        try {
            auto target = std::make_shared<LibraryTrack>(0, this->library);
            target->SetValue("external_id", externalId);
            auto search = std::make_shared<TrackMetadataQuery>(target, this->library);
            this->library->EnqueueAndWait(search);
            if (search->GetStatus() == IQuery::Finished) {
                return search->Result()->GetSdkValue();
            }
        }
        catch (...) {
            musik::debug::error(TAG, "QueryTrackByExternalId failed");
        }
    }

    return nullptr;
}

ITrackList* LocalMetadataProxy::QueryTracksByCategory(
    const char* categoryType, int64_t selectedId, const char* filter, int limit, int offset)
{
    try {
        std::shared_ptr<TrackListQueryBase> search;

        if (std::string(categoryType) == constants::Playlists::TABLE_NAME) {
            search = std::make_shared<GetPlaylistQuery>(this->library, selectedId);
        }
        else {
            if (categoryType && strlen(categoryType) && selectedId > 0) {
                search = std::make_shared<CategoryTrackListQuery>(
                    this->library, categoryType, selectedId, filter);
            }
            else {
                search = std::make_shared<CategoryTrackListQuery>(this->library, filter);
            }
        }

        if (limit >= 0) {
            search->SetLimitAndOffset(limit, offset);
        }

        this->library->EnqueueAndWait(search);

        if (search->GetStatus() == IQuery::Finished) {
            return search->GetSdkResult();
        }
    }
    catch (...) {
        musik::debug::error(TAG, "QueryTracksByCategory failed");
    }

    return nullptr;
}

ITrackList* LocalMetadataProxy::QueryTracksByCategories(
    IValue** categories, size_t categoryCount, const char* filter, int limit, int offset)
{
    try {
        PredicateList list = toPredicateList(categories, categoryCount);

        auto query = std::make_shared<CategoryTrackListQuery>(this->library, list, filter);

        if (limit >= 0) {
            query->SetLimitAndOffset(limit, offset);
        }

        this->library->EnqueueAndWait(query);

        if (query->GetStatus() == IQuery::Finished) {
            return query->GetSdkResult();
        }
    }
    catch (...) {
        musik::debug::error(TAG, "QueryTracksByCategory failed");
    }

    return nullptr;
}

IValueList* LocalMetadataProxy::QueryCategory(const char* type, const char* filter) {
    return QueryCategoryWithPredicate(type, "", -1LL, filter);
}

IValueList* LocalMetadataProxy::ListCategories() {
    try {
        auto query = std::make_shared<AllCategoriesQuery>();
        this->library->EnqueueAndWait(query);

        if (query->GetStatus() == IQuery::Finished) {
            return query->GetSdkResult();
        }
    }
    catch (...) {
        musik::debug::error(TAG, "ListCategories failed");
    }

    return nullptr;
}


IValueList* LocalMetadataProxy::QueryCategoryWithPredicate(
    const char* type, const char* predicateType, int64_t predicateId, const char* filter)
{
    try {
        const std::string field = predicateType ? predicateType : "";
        const category::PredicateList predicates = { { field, predicateId } };

        auto search = std::make_shared<CategoryListQuery>(
            CategoryListQuery::MatchType::Substring,
            type,
            predicates,
            std::string(filter ? filter : ""));

        this->library->EnqueueAndWait(search);

        if (search->GetStatus() == IQuery::Finished) {
            return search->GetSdkResult();
        }
    }
    catch (...) {
        musik::debug::error(TAG, "QueryCategory failed");
    }

    return nullptr;
}

IValueList* LocalMetadataProxy::QueryCategoryWithPredicates(
    const char* type, IValue** predicates, size_t predicateCount, const char* filter)
{
    try {
        auto predicateList = toPredicateList(predicates, predicateCount);

        auto query = std::make_shared<CategoryListQuery>(
            CategoryListQuery::MatchType::Substring,
            type,
            predicateList,
            std::string(filter ? filter : ""));

        this->library->EnqueueAndWait(query);

        if (query->GetStatus() == IQuery::Finished) {
            return query->GetSdkResult();
        }
    }
    catch (...) {
        musik::debug::error(TAG, "QueryCategory failed");
    }

    return nullptr;
}

IMapList* LocalMetadataProxy::QueryAlbums(
    const char* categoryIdName, int64_t categoryIdValue, const char* filter)
{
    try {
        auto search = std::make_shared<AlbumListQuery>(
            std::string(categoryIdName ? categoryIdName : ""),
            categoryIdValue,
            std::string(filter ? filter : ""));

        this->library->EnqueueAndWait(search);

        if (search->GetStatus() == IQuery::Finished) {
            return search->GetSdkResult();
        }
    }
    catch (...) {
        musik::debug::error(TAG, "QueryAlbums failed");
    }

    return nullptr;
}

IMapList* LocalMetadataProxy::QueryAlbums(const char* filter) {
    return this->QueryAlbums(nullptr, -1, filter);
}

template <typename TrackListType>
static uint64_t savePlaylist(
    ILibraryPtr library,
    TrackListType trackList,
    const char* playlistName,
    const int64_t playlistId)
{
    try {
        /* replacing (and optionally renaming) an existing playlist */
        if (playlistId != 0) {
            std::shared_ptr<SavePlaylistQuery> query =
                SavePlaylistQuery::Replace(library, playlistId, trackList);

            library->EnqueueAndWait(query);

            if (query->GetStatus() == IQuery::Finished) {
                if (strlen(playlistName)) {
                    query = SavePlaylistQuery::Rename(library, playlistId, playlistName);

                    library->EnqueueAndWait(query);

                    if (query->GetStatus() == IQuery::Finished) {
                        return playlistId;
                    }
                }
                else {
                    return playlistId;
                }
            }
        }
        else {
            std::shared_ptr<SavePlaylistQuery> query =
                SavePlaylistQuery::Save(library, playlistName, trackList);

            library->EnqueueAndWait(query);

            if (query->GetStatus() == IQuery::Finished) {
                return query->GetPlaylistId();
            }
        }
    }
    catch (...) {
        musik::debug::error(TAG, "SavePlaylist failed");
    }

    return 0;
}

int64_t LocalMetadataProxy::SavePlaylistWithIds(
    int64_t* trackIds,
    size_t trackIdCount,
    const char* playlistName,
    const int64_t playlistId)
{
    if (playlistId == 0 && (!playlistName || !strlen(playlistName))) {
        return 0;
    }

    std::shared_ptr<TrackList> trackList =
        std::make_shared<TrackList>(this->library, trackIds, trackIdCount);

    return savePlaylist(this->library, trackList, playlistName, playlistId);
}

int64_t LocalMetadataProxy::SavePlaylistWithExternalIds(
    const char** externalIds,
    size_t externalIdCount,
    const char* playlistName,
    const int64_t playlistId)
{
    if (playlistId == 0 && (!playlistName || !strlen(playlistName))) {
        return 0;
    }

    try {
        using Query = ExternalIdListToTrackListQuery;

        std::shared_ptr<Query> query =
            std::make_shared<Query>(this->library, externalIds, externalIdCount);

        library->EnqueueAndWait(query);

        if (query->GetStatus() == IQuery::Finished) {
            return savePlaylist(this->library, query->GetResult(), playlistName, playlistId);
        }
    }
    catch (...) {
        musik::debug::error(TAG, "SavePlaylistWithExternalIds failed");
    }

    return 0;
}

int64_t LocalMetadataProxy::SavePlaylistWithTrackList(
    ITrackList* trackList,
    const char* playlistName,
    const int64_t playlistId)
{
    if (playlistId == 0 && (!playlistName || !strlen(playlistName))) {
        return 0;
    }

    return savePlaylist(this->library, trackList, playlistName, playlistId);
}

bool LocalMetadataProxy::RenamePlaylist(const int64_t playlistId, const char* name)
{
    if (strlen(name)) {
        try {
            std::shared_ptr<SavePlaylistQuery> query =
                SavePlaylistQuery::Rename(library, playlistId, name);

            this->library->EnqueueAndWait(query);

            if (query->GetStatus() == IQuery::Finished) {
                return true;
            }
        }
        catch (...) {
            musik::debug::error(TAG, "RenamePlaylist failed");
        }
    }

    return false;
}

bool LocalMetadataProxy::DeletePlaylist(const int64_t playlistId) {
    try {
        std::shared_ptr<DeletePlaylistQuery> query =
            std::make_shared<DeletePlaylistQuery>(library, playlistId);

        this->library->EnqueueAndWait(query);

        if (query->GetStatus() == IQuery::Finished) {
            return true;
        }
    }
    catch (...) {
        musik::debug::error(TAG, "DeletePlaylist failed");
    }

    return false;
}

template <typename TrackListType>
static bool appendToPlaylist(
    ILibraryPtr library,
    const int64_t playlistId,
    TrackListType trackList,
    int offset)
{
    try {
        std::shared_ptr<AppendPlaylistQuery> query =
            std::make_shared<AppendPlaylistQuery>(
                library, playlistId, trackList, offset);

        library->EnqueueAndWait(query);

        if (query->GetStatus() == IQuery::Finished) {
            return true;
        }
    }
    catch (...) {
        musik::debug::error(TAG, "AppendToPlaylist failed");
    }

    return false;
}

bool LocalMetadataProxy::AppendToPlaylistWithIds(
    const int64_t playlistId,
    const int64_t* ids,
    size_t idCount,
    int offset)
{
    std::shared_ptr<TrackList> trackList =
        std::make_shared<TrackList>(this->library, ids, idCount);

    return appendToPlaylist(this->library, playlistId, trackList, offset);
}

bool LocalMetadataProxy::AppendToPlaylistWithExternalIds(
    const int64_t playlistId,
    const char** externalIds,
    size_t externalIdCount,
    int offset)
{
    using Query = ExternalIdListToTrackListQuery;

    try {
        std::shared_ptr<Query> query =
            std::make_shared<Query>(this->library, externalIds, externalIdCount);

        library->EnqueueAndWait(query);

        if (query->GetStatus() == IQuery::Finished) {
            return appendToPlaylist(this->library, playlistId, query->GetResult(), offset);
        }
    }
    catch (...) {
        musik::debug::error(TAG, "AppendToPlaylistWithExternalIds failed");
    }

    return 0;

}

bool LocalMetadataProxy::AppendToPlaylistWithTrackList(
    const int64_t playlistId, ITrackList* trackList, int offset)
{
    return appendToPlaylist(this->library, playlistId, trackList, offset);
}

size_t LocalMetadataProxy::RemoveTracksFromPlaylist(
    const int64_t playlistId,
    const char** externalIds,
    const int* sortOrders,
    int count)
{
    try {
        auto query = std::make_shared<RemoveFromPlaylistQuery>(
            this->library, playlistId, externalIds, sortOrders, count);

        library->EnqueueAndWait(query);

        if (query->GetStatus() == IQuery::Finished) {
            return query->GetResult();
        }
    }
    catch (...) {
        musik::debug::error(TAG, "RemoveTracksFromPlaylist failed");
    }

    return 0;
}

ITrackList* LocalMetadataProxy::QueryTracksByExternalId(
    const char** externalIds, size_t externalIdCount)
{
    try {
        auto query = std::make_shared<ExternalIdListToTrackListQuery>(
            this->library, externalIds, externalIdCount);

        library->EnqueueAndWait(query);

        if (query->GetStatus() == IQuery::Finished) {
            return query->GetSdkResult();
        }
    }
    catch (...) {
        musik::debug::error(TAG, "QueryTracksByExternalId failed");
    }

    return nullptr;
}

bool LocalMetadataProxy::SendRawQuery(
    const char* query, IAllocator& allocator, char** resultData, int* resultSize)
{
    if (!resultData || !resultSize) {
        return false;
    }

    try {
        nlohmann::json json = nlohmann::json::parse(query);
        auto localLibrary = LibraryFactory::Instance().DefaultLocalLibrary();
        std::string name = json["name"];
        auto libraryQuery = QueryRegistry::CreateLocalQueryFor(name, query, localLibrary);
        if (libraryQuery) {
            localLibrary->EnqueueAndWait(libraryQuery);
            if (libraryQuery->GetStatus() == IQuery::Finished) {
                std::string result = libraryQuery->SerializeResult();
                *resultData = static_cast<char*>(allocator.Allocate(result.size() + 1));
                if (*resultData) {
                    *resultSize = (int) result.size() + 1;
                    strncpy(*resultData, result.c_str(), *resultSize);
                    return true;
                }
                else {
                    musik::debug::error(TAG, "SendRawQuery failed: memory allocation failed");
                }
            }
            else {
                musik::debug::error(TAG, "SendRawQuery failed: query returned failure");
            }
        }
        else {
            musik::debug::error(TAG, "SendRawQuery failed: could not find query in registry");
        }
    }
    catch (...) {
        musik::debug::error(TAG, "SendRawQuery failed: exception thrown");
    }
    return false;
}