#include "emojis.h"
#include "emotemanager.h"

#include <QFile>
#include <QStringBuilder>
#include <QTextStream>

namespace chatterino {

QRegularExpression Emojis::findShortCodesRegex(":([-+\\w]+):");

QMap<QString, Emojis::EmojiData> Emojis::shortCodeToEmoji;
QMap<QString, QString> Emojis::emojiToShortCode;
QMap<QChar, QMap<QString, QString>> Emojis::firstEmojiChars;

ConcurrentMap<QString, messages::LazyLoadedImage *> Emojis::imageCache;

QString Emojis::replaceShortCodes(const QString &text)
{
    // TODO: Implement this xD
    return text;
}

void Emojis::parseEmojis(std::vector<std::tuple<messages::LazyLoadedImage *, QString>> &vector,
                         const QString &text)
{
    long lastSlice = 0;

    for (auto i = 0; i < text.length() - 1; i++) {
        if (!text.at(i).isLowSurrogate()) {
            auto iter = firstEmojiChars.find(text.at(i));

            if (iter != firstEmojiChars.end()) {
                for (auto j = std::min(8, text.length() - i); j > 0; j--) {
                    QString emojiString = text.mid(i, 2);
                    auto emojiIter = iter.value().find(emojiString);

                    if (emojiIter != iter.value().end()) {
                        QString url = "https://cdnjs.cloudflare.com/ajax/libs/"
                                      "emojione/2.2.6/assets/png/" +
                                      emojiIter.value() + ".png";

                        if (i - lastSlice != 0) {
                            vector.push_back(std::tuple<messages::LazyLoadedImage *, QString>(
                                NULL, text.mid(lastSlice, i - lastSlice)));
                        }

                        vector.push_back(std::tuple<messages::LazyLoadedImage *, QString>(
                            imageCache.getOrAdd(
                                url, [&url] { return new messages::LazyLoadedImage(url, 0.35); }),
                            QString()));

                        i += j - 1;

                        lastSlice = i + 1;

                        break;
                    }
                }
            }
        }
    }

    if (lastSlice < text.length()) {
        vector.push_back(
            std::tuple<messages::LazyLoadedImage *, QString>(NULL, text.mid(lastSlice)));
    }
}

void Emojis::loadEmojis()
{
    QFile file(":/emojidata.txt");
    file.open(QFile::ReadOnly);
    QTextStream in(&file);

    uint emotes[4];

    while (!in.atEnd()) {
        QString line = in.readLine();

        if (line.length() < 3 || line.at(0) == '#')
            continue;

        QStringList a = line.split(' ');
        if (a.length() < 2)
            continue;

        QStringList b = a.at(1).split('-');
        if (b.length() < 1)
            continue;

        int i = 0;

        for (const QString &item : b) {
            emotes[i++] = QString(item).toUInt(nullptr, 16);
        }

        shortCodeToEmoji.insert(a.at(0), Emojis::EmojiData{QString::fromUcs4(emotes, i), a.at(1)});
    }

    for (auto const &emoji : shortCodeToEmoji.toStdMap()) {
        emojiToShortCode.insert(emoji.second.value, emoji.first);
    }

    for (auto const &emoji : shortCodeToEmoji.toStdMap()) {
        auto iter = firstEmojiChars.find(emoji.first.at(0));

        if (iter != firstEmojiChars.end()) {
            iter.value().insert(emoji.second.value, emoji.second.value);
            continue;
        }

        firstEmojiChars.insert(emoji.first.at(0),
                               QMap<QString, QString>{{emoji.second.value, emoji.second.code}});
    }
}
}