#include <QDebug>
#include <QFile>
#include <QModelIndex>
#include <QModelIndexList>
#include <QPainter>
#include <QTextStream>

#include "players_model.h"

PlayersListModel::PlayersListModel(QObject *parent)
    : QAbstractListModel(parent) {
  m_fontInRoom = QFont();
  m_fontInRoom.setItalic(true);
}

int PlayersListModel::rowCount(const QModelIndex &parent) const {
  if (parent.isValid())
    return 0;
  else
    return m_data.size();
}

QVariant PlayersListModel::data(const QModelIndex &index, int role) const {
  if (!index.isValid() || index.row() < 0 || index.row() >= rowCount() ||
      index.column() != 0)
    return QVariant{};

  return m_data.at(index.row()).value(role);
}

bool PlayersListModel::setData(const QModelIndex &index, const QVariant &value,
                               int role) {
  if (!index.isValid() || index.row() < 0 || index.row() >= rowCount() ||
      index.column() != 0)
    return false;

  m_data[index.row()].insert(role, value);

  emit dataChanged(index, index);

  return true;
}

bool PlayersListModel::insertRows(int row, int count,
                                  const QModelIndex &parent) {
  if (parent.isValid() || row > rowCount() || row < 0 || count < 1)
    return false;

  beginInsertRows(parent, row, row + count - 1);

  for (int i = 0; i < count; ++i) m_data.insert(row, DataEntry());

  endInsertRows();

  return true;
}

bool PlayersListModel::removeRows(int row, int count,
                                  const QModelIndex &parent) {
  if (parent.isValid() || row + count > rowCount() || row < 0 || count < 1)
    return false;

  beginRemoveRows(parent, row, row + count - 1);

  for (int i = 0; i < count; ++i) m_data.removeAt(row);

  endRemoveRows();

  return true;
}

QModelIndex PlayersListModel::nicknameIndex(const QString &nickname) {
  QModelIndexList mil =
      match(index(0), Qt::DisplayRole, nickname, 1, Qt::MatchExactly);

  if (mil.size() > 0)
    return mil[0];
  else
    return QModelIndex();
}

void PlayersListModel::addPlayer(const QString &nickname, bool notify) {
  insertRow(rowCount());

  QModelIndex mi = index(rowCount() - 1);
  setData(mi, nickname);

  checkFriendIgnore(mi);

  emit nickAddedLobby(nickname, notify);
}

void PlayersListModel::removePlayer(const QString &nickname,
                                    const QString &msg) {
  if (msg.isEmpty())
    emit nickRemovedLobby(nickname, QString());
  else
    emit nickRemovedLobby(nickname, msg);

  QModelIndex mi = nicknameIndex(nickname);

  if (mi.isValid()) removeRow(mi.row());
}

void PlayersListModel::playerJoinedRoom(const QString &nickname, bool notify) {
  QModelIndex mi = nicknameIndex(nickname);

  if (mi.isValid()) {
    setData(mi, true, RoomFilterRole);
    updateIcon(mi);
    updateSortData(mi);
  }

  emit nickAdded(nickname, notify);
}

void PlayersListModel::playerLeftRoom(const QString &nickname) {
  emit nickRemoved(nickname);

  QModelIndex mi = nicknameIndex(nickname);

  if (mi.isValid()) {
    setData(mi, false, RoomFilterRole);
    setData(mi, false, RoomAdmin);
    setData(mi, false, Ready);
    setData(mi, false, InGame);
    updateIcon(mi);
  }
}

void PlayersListModel::setFlag(const QString &nickname, StateFlag flagType,
                               bool isSet) {
  if (flagType == Friend) {
    if (isSet)
      m_friendsSet.insert(nickname.toLower());
    else
      m_friendsSet.remove(nickname.toLower());

    // FIXME: set proper file name
    // saveSet(m_friendsSet, "friends");
  } else if (flagType == Ignore) {
    if (isSet)
      m_ignoredSet.insert(nickname.toLower());
    else
      m_ignoredSet.remove(nickname.toLower());

    // FIXME: set proper file name
    // saveSet(m_ignoredSet, "ignore");
  }

  QModelIndex mi = nicknameIndex(nickname);

  if (mi.isValid()) {
    setData(mi, isSet, flagType);

    if (flagType == Friend || flagType == ServerAdmin || flagType == Ignore ||
        flagType == RoomAdmin)
      updateSortData(mi);

    updateIcon(mi);
  }
}

bool PlayersListModel::isFlagSet(const QString &nickname, StateFlag flagType) {
  QModelIndex mi = nicknameIndex(nickname);

  if (mi.isValid())
    return mi.data(flagType).toBool();
  else if (flagType == Friend)
    return isFriend(nickname);
  else if (flagType == Ignore)
    return isIgnored(nickname);
  else
    return false;
}

void PlayersListModel::resetRoomFlags() {
  for (int i = rowCount() - 1; i >= 0; --i) {
    QModelIndex mi = index(i);

    if (mi.data(RoomFilterRole).toBool()) {
      setData(mi, false, RoomFilterRole);
      setData(mi, false, RoomAdmin);
      setData(mi, false, Ready);
      setData(mi, false, InGame);

      updateSortData(mi);
      updateIcon(mi);
    }
  }
}

void PlayersListModel::updateIcon(const QModelIndex &index) {
  quint32 iconNum = 0;

  QList<bool> flags;
  flags << index.data(Ready).toBool() << index.data(ServerAdmin).toBool()
        << index.data(RoomAdmin).toBool() << index.data(Registered).toBool()
        << index.data(Friend).toBool() << index.data(Ignore).toBool()
        << index.data(InGame).toBool() << index.data(RoomFilterRole).toBool()
        << index.data(InRoom).toBool() << index.data(Contributor).toBool();

  for (int i = flags.size() - 1; i >= 0; --i)
    if (flags[i]) iconNum |= 1 << i;

  if (m_icons().contains(iconNum)) {
    setData(index, m_icons().value(iconNum), Qt::DecorationRole);
  } else {
    QPixmap result(24, 16);
    result.fill(Qt::transparent);

    QPainter painter(&result);

    if (index.data(RoomFilterRole).toBool()) {
      if (index.data(InGame).toBool()) {
        painter.drawPixmap(0, 0, 16, 16, QPixmap(":/res/chat/ingame.png"));
      } else {
        if (index.data(Ready).toBool())
          painter.drawPixmap(0, 0, 16, 16, QPixmap(":/res/chat/lamp.png"));
        else
          painter.drawPixmap(0, 0, 16, 16, QPixmap(":/res/chat/lamp_off.png"));
      }
    } else {  // we're in lobby
      if (!index.data(InRoom).toBool())
        painter.drawPixmap(0, 0, 16, 16, QPixmap(":/res/Flake.png"));
    }

    QString mainIconName(":/res/chat/");

    if (index.data(ServerAdmin).toBool())
      mainIconName += "serveradmin";
    else {
      if (index.data(RoomAdmin).toBool())
        mainIconName += "roomadmin";
      else
        mainIconName += "hedgehog";

      if (index.data(Contributor).toBool()) mainIconName += "contributor";
    }

    if (!index.data(Registered).toBool()) mainIconName += "_gray";

    painter.drawPixmap(8, 0, 16, 16, QPixmap(mainIconName + ".png"));

    if (index.data(Ignore).toBool())
      painter.drawPixmap(8, 0, 16, 16, QPixmap(":/res/chat/ignore.png"));
    else if (index.data(Friend).toBool())
      painter.drawPixmap(8, 0, 16, 16, QPixmap(":/res/chat/friend.png"));

    painter.end();

    QIcon icon(result);

    setData(index, icon, Qt::DecorationRole);
    m_icons().insert(iconNum, icon);
  }

  if (index.data(Ignore).toBool())
    setData(index, QColor(Qt::gray), Qt::ForegroundRole);
  else if (index.data(Friend).toBool())
    setData(index, QColor(Qt::green), Qt::ForegroundRole);
  else
    setData(index, QBrush(QColor(0xff, 0xcc, 0x00)), Qt::ForegroundRole);
}

QHash<quint32, QIcon> &PlayersListModel::m_icons() {
  static QHash<quint32, QIcon> iconsCache;

  return iconsCache;
}

void PlayersListModel::updateSortData(const QModelIndex &index) {
  const auto result =
      QStringLiteral("%1%2%3%4%5%6")
          // room admins go first, then server admins, then friends
          .arg(1 - index.data(RoomAdmin).toInt())
          .arg(1 - index.data(ServerAdmin).toInt())
          .arg(1 - index.data(Friend).toInt())
          // ignored at bottom
          .arg(index.data(Ignore).toInt())
          // keep nicknames starting from non-letter character at bottom within
          // group assume there are no empty nicks in list
          .arg(index.data(Qt::DisplayRole).toString().at(0).isLetter() ? 0 : 1)
          // sort ignoring case
          .arg(index.data(Qt::DisplayRole).toString().toLower());

  setData(index, result, SortRole);
}

void PlayersListModel::setNickname(const QString &nickname) {
  m_nickname = nickname;

  // FIXME: set proper file names
  // loadSet(m_friendsSet, "friends");
  // loadSet(m_ignoredSet, "ignore");

  for (int i = rowCount() - 1; i >= 0; --i) checkFriendIgnore(index(i));
}

bool PlayersListModel::isFriend(const QString &nickname) {
  return m_friendsSet.contains(nickname.toLower());
}

bool PlayersListModel::isIgnored(const QString &nickname) {
  return m_ignoredSet.contains(nickname.toLower());
}

void PlayersListModel::checkFriendIgnore(const QModelIndex &mi) {
  setData(mi, isFriend(mi.data().toString()), Friend);
  setData(mi, isIgnored(mi.data().toString()), Ignore);

  updateIcon(mi);
  updateSortData(mi);
}

void PlayersListModel::loadSet(QSet<QString> &set, const QString &fileName) {
  set.clear();

  QFile txt(fileName);
  if (!txt.open(QIODevice::ReadOnly)) return;

  QTextStream stream(&txt);

  while (!stream.atEnd()) {
    QString str = stream.readLine();
    if (str.startsWith(';') || str.isEmpty()) {
      continue;
    }

    set.insert(str.trimmed());
  }

  txt.close();
}

void PlayersListModel::saveSet(const QSet<QString> &set,
                               const QString &fileName) {
  qDebug("saving set");

  QFile txt(fileName);

  // list empty? => rather have no file for the list than an empty one
  if (set.isEmpty()) {
    if (txt.exists()) {
      // try to remove file, if successful we're done here.
      if (txt.remove()) return;
    } else
      // there is no file
      return;
  }

  if (!txt.open(QIODevice::WriteOnly | QIODevice::Truncate)) return;

  QTextStream stream(&txt);

  stream << "; this list is used by Hedgewars - do not edit it unless you know "
            "what you're doing!"
         << Qt::endl;

  foreach (const QString &nick, set.values())
    stream << nick << Qt::endl;

  txt.close();
}