#pragma once

#include <QList>
#include <QString>
#include <QStringList>

// Which audio and subtitle tracks to turn on when a file opens. mpv only turns on a
// subtitle that is flagged default or matches --slang, so many files open with none.
namespace TrackSelection
{
struct Track {
    int id = 0;
    QString lang;
    QString codec;
    bool forced = false;
    bool isDefault = false;
};

// True for picture-based subtitles (PGS, VobSub, DVB), which can't be translated.
// \a codec is the FFmpeg codec name that mpv reports.
bool isBitmapSubtitle(const QString &codec);

// Compares language tags written as ISO 639-1/2 codes ("en", "eng"), with a region
// ("en-US") or as English names ("English").
bool sameLanguage(const QString &a, const QString &b);

// The first audio track in a \a preferredLanguages language, else \a currentId.
int pickAudio(const QList<Track> &tracks, const QStringList &preferredLanguages, int currentId);

// The subtitle to turn on when the file opens. A track in one of \a preferredLanguages
// wins over mpv's own choice \a currentId. Next comes \a translationId, the file's
// saved translation, when \a fallback is set; without either, \a currentId is kept.
// When mpv chose nothing and \a fallback is set, picks a full (not forced) subtitle in
// the first of \a fallbackLanguages that has one, then one flagged default, then the
// first one. Text subtitles win over bitmap ones in the same step. Returns 0 for no
// subtitle.
int pickSubtitle(const QList<Track> &tracks,
                 const QStringList &preferredLanguages,
                 const QStringList &fallbackLanguages,
                 int currentId,
                 bool fallback,
                 int translationId = 0);

// The subtitle to translate: \a currentId when it is a text subtitle, else a full text
// subtitle in the first of \a sourceLanguages that has one, then one flagged default,
// then the first one. 0 when there is no text subtitle.
int pickTranslationSource(const QList<Track> &tracks, const QStringList &sourceLanguages, int currentId);
}