#include "tagcompleter.h"

#include <QLineEdit>
#include <QStringListModel>

TagCompleter::TagCompleter(QObject *parent)
    : QCompleter(parent)
    , m_model(new QStringListModel(this))
{
    setModel(m_model);
    setCaseSensitivity(Qt::CaseInsensitive);
    setFilterMode(Qt::MatchContains); // match anywhere in the tag, like Android
    setCompletionMode(QCompleter::PopupCompletion);
}

void TagCompleter::setSuggestions(const QStringList &tags)
{
    m_model->setStringList(tags);
}

// Complete against the token after the last comma, ignoring the tags already
// entered before it.
QStringList TagCompleter::splitPath(const QString &path) const
{
    return QStringList(path.section(QLatin1Char(','), -1).trimmed());
}

// Rebuild the full field value: everything up to and including the last comma,
// then the chosen tag and a trailing ", " ready for the next one.
QString TagCompleter::pathFromIndex(const QModelIndex &index) const
{
    const QString completion = QCompleter::pathFromIndex(index);
    const auto *edit = qobject_cast<const QLineEdit *>(widget());
    if (!edit)
        return completion;

    const QString text = edit->text();
    const int lastComma = text.lastIndexOf(QLatin1Char(','));
    const QString head =
        lastComma >= 0 ? text.left(lastComma + 1) + QLatin1Char(' ') : QString();
    return head + completion + QStringLiteral(", ");
}