#include "providers/ffz/FfzEmotes.hpp"

#include <QJsonArray>

#include "common/NetworkRequest.hpp"
#include "common/Outcome.hpp"
#include "debug/Log.hpp"
#include "messages/Emote.hpp"
#include "messages/Image.hpp"

namespace chatterino {
namespace {
    Url getEmoteLink(const QJsonObject &urls, const QString &emoteScale)
    {
        auto emote = urls.value(emoteScale);
        if (emote.isUndefined()) {
            return {""};
        }

        assert(emote.isString());

        return {"https:" + emote.toString()};
    }
    void fillInEmoteData(const QJsonObject &urls, const EmoteName &name,
                         const QString &tooltip, Emote &emoteData)
    {
        auto url1x = getEmoteLink(urls, "1");
        auto url2x = getEmoteLink(urls, "2");
        auto url3x = getEmoteLink(urls, "4");

        //, code, tooltip
        emoteData.name = name;
        emoteData.images =
            ImageSet{Image::fromUrl(url1x, 1), Image::fromUrl(url2x, 0.5),
                     Image::fromUrl(url3x, 0.25)};
        emoteData.tooltip = {tooltip};
    }
    EmotePtr cachedOrMake(Emote &&emote, const EmoteId &id)
    {
        static std::unordered_map<EmoteId, std::weak_ptr<const Emote>> cache;
        static std::mutex mutex;

        return cachedOrMakeEmotePtr(std::move(emote), cache, mutex, id);
    }
    std::pair<Outcome, EmoteMap> parseGlobalEmotes(
        const QJsonObject &jsonRoot, const EmoteMap &currentEmotes)
    {
        auto jsonSets = jsonRoot.value("sets").toObject();
        auto emotes = EmoteMap();

        for (auto jsonSet : jsonSets) {
            auto jsonEmotes = jsonSet.toObject().value("emoticons").toArray();

            for (auto jsonEmoteValue : jsonEmotes) {
                auto jsonEmote = jsonEmoteValue.toObject();

                auto name = EmoteName{jsonEmote.value("name").toString()};
                auto id = EmoteId{jsonEmote.value("id").toString()};
                auto urls = jsonEmote.value("urls").toObject();

                auto emote = Emote();
                fillInEmoteData(urls, name,
                                name.string + "<br/>Global FFZ Emote", emote);
                emote.homePage =
                    Url{QString("https://www.frankerfacez.com/emoticon/%1-%2")
                            .arg(id.string)
                            .arg(name.string)};

                emotes[name] =
                    cachedOrMakeEmotePtr(std::move(emote), currentEmotes);
            }
        }

        return {Success, std::move(emotes)};
    }
    std::pair<Outcome, EmoteMap> parseChannelEmotes(const QJsonObject &jsonRoot)
    {
        auto jsonSets = jsonRoot.value("sets").toObject();
        auto emotes = EmoteMap();

        for (auto jsonSet : jsonSets) {
            auto jsonEmotes = jsonSet.toObject().value("emoticons").toArray();

            for (auto _jsonEmote : jsonEmotes) {
                auto jsonEmote = _jsonEmote.toObject();

                // margins
                auto id =
                    EmoteId{QString::number(jsonEmote.value("id").toInt())};
                auto name = EmoteName{jsonEmote.value("name").toString()};
                auto urls = jsonEmote.value("urls").toObject();

                Emote emote;
                fillInEmoteData(urls, name,
                                name.string + "<br/>Channel FFZ Emote", emote);
                emote.homePage =
                    Url{QString("https://www.frankerfacez.com/emoticon/%1-%2")
                            .arg(id.string)
                            .arg(name.string)};

                emotes[name] = cachedOrMake(std::move(emote), id);
            }
        }

        return {Success, std::move(emotes)};
    }
}  // namespace

FfzEmotes::FfzEmotes()
    : global_(std::make_shared<EmoteMap>())
{
}

std::shared_ptr<const EmoteMap> FfzEmotes::emotes() const
{
    return this->global_.get();
}

boost::optional<EmotePtr> FfzEmotes::emote(const EmoteName &name) const
{
    auto emotes = this->global_.get();
    auto it = emotes->find(name);
    if (it != emotes->end()) return it->second;
    return boost::none;
}

void FfzEmotes::loadEmotes()
{
    QString url("https://api.frankerfacez.com/v1/set/global");

    NetworkRequest request(url);
    request.setCaller(QThread::currentThread());
    request.setTimeout(30000);

    request.onSuccess([this](auto result) -> Outcome {
        auto emotes = this->emotes();
        auto pair = parseGlobalEmotes(result.parseJson(), *emotes);
        if (pair.first)
            this->global_.set(
                std::make_shared<EmoteMap>(std::move(pair.second)));
        return pair.first;
    });

    request.execute();
}

void FfzEmotes::loadChannel(const QString &channelName,
                            std::function<void(EmoteMap &&)> callback)
{
    log("[FFZEmotes] Reload FFZ Channel Emotes for channel {}\n", channelName);

    NetworkRequest request("https://api.frankerfacez.com/v1/room/" +
                           channelName);
    request.setCaller(QThread::currentThread());
    request.setTimeout(20000);

    request.onSuccess([callback = std::move(callback)](auto result) -> Outcome {
        auto pair = parseChannelEmotes(result.parseJson());
        if (pair.first) callback(std::move(pair.second));
        return pair.first;
    });

    request.onError([channelName](int result) {
        if (result == 203) {
            // User does not have any FFZ emotes
            return true;
        }

        if (result == -2) {
            // TODO: Auto retry in case of a timeout, with a delay
            log("Fetching FFZ emotes for channel {} failed due to timeout",
                channelName);
            return true;
        }

        log("Error fetching FFZ emotes for channel {}, error {}", channelName,
            result);

        return true;
    });

    request.execute();
}

}  // namespace chatterino