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/*
* qtmaildir - a Qt6 mail client for notmuch-indexed Maildirs
* Copyright (C) 2026 Danilo M. <danix@danix.xyz>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "carddelegate.h"
#include "threadlistmodel.h"
#include <QTest>
class TestCardDelegate : public QObject
{
Q_OBJECT
private slots:
void theAccentLiftsAMutedAccountColour();
void theAccentKeepsEachAccountTellableApart();
void anAccountWithNoColourFallsBackToTheNeutralLine();
};
namespace {
/// The user's five configured account colours, as a realistic sample. They are
/// all mid-tone because they were chosen as CHIP fills, which is the whole
/// reason the bar has to lift them.
const QList<QColor> &sampleAccounts()
{
static const QList<QColor> colours{
QColor("#2f6fa8"), QColor("#3d7a4a"), QColor("#a83f2f"),
QColor("#8a5cb8"), QColor("#b8862f"),
};
return colours;
}
float saturationOf(const QColor &c)
{
float h = 0, s = 0, l = 0, a = 0;
c.getHslF(&h, &s, &l, &a);
return s;
}
float lightnessOf(const QColor &c)
{
float h = 0, s = 0, l = 0, a = 0;
c.getHslF(&h, &s, &l, &a);
return l;
}
float hueOf(const QColor &c)
{
float h = 0, s = 0, l = 0, a = 0;
c.getHslF(&h, &s, &l, &a);
return h;
}
} // namespace
void TestCardDelegate::theAccentLiftsAMutedAccountColour()
{
// An account colour is chosen to be a chip's fill with legible text on top,
// so it is mid-tone by construction. Three pixels of a mid-tone colour
// beside a card's own background barely register, which is what the user
// reported: "the colours could be a little more vivid".
//
// The green is the weakest of the five (S 0.33, L 0.36) and is the one that
// has to move most.
const QColor muted("#3d7a4a");
const QColor accent = CardDelegate::accentLineColour(muted);
QVERIFY2(saturationOf(accent) > saturationOf(muted),
"the accent is no more saturated than the chip colour it comes "
"from, so a muted account stays muted as a 3px bar");
QVERIFY2(lightnessOf(accent) > lightnessOf(muted),
"the accent is no lighter than the chip colour, so it cannot "
"carry on a dark theme");
// The floor, stated as the numbers that were chosen by rendering all five
// against both themes. Higher pushed the green toward a neon that no
// longer matched its own chip.
QVERIFY(saturationOf(accent) >= 0.65f - 0.01f);
QVERIFY(lightnessOf(accent) >= 0.50f - 0.01f);
// A colour already past the floor is left alone: the lift is a floor, not
// a repaint, or a user who picked a vivid colour would have it changed.
const QColor alreadyVivid = QColor::fromHslF(0.6f, 0.9f, 0.6f);
const QColor untouched = CardDelegate::accentLineColour(alreadyVivid);
QCOMPARE(saturationOf(untouched), saturationOf(alreadyVivid));
QCOMPARE(lightnessOf(untouched), lightnessOf(alreadyVivid));
}
void TestCardDelegate::theAccentKeepsEachAccountTellableApart()
{
// The bar's whole job is saying WHICH account, so the lift must not
// converge two hues. Asserted across the real five rather than one pair:
// a floor applied to saturation and lightness leaves hue untouched, and
// this is what proves it stayed that way.
for (const QColor &configured : sampleAccounts()) {
const QColor accent = CardDelegate::accentLineColour(configured);
QVERIFY2(qAbs(hueOf(accent) - hueOf(configured)) < 0.01f,
qPrintable(QStringLiteral("account %1 changed hue to %2, so "
"it no longer matches its own chip")
.arg(configured.name(), accent.name())));
}
// And no two of them collapse onto each other.
QSet<QRgb> seen;
for (const QColor &configured : sampleAccounts())
seen.insert(CardDelegate::accentLineColour(configured).rgb());
QCOMPARE(seen.size(), sampleAccounts().size());
}
void TestCardDelegate::anAccountWithNoColourFallsBackToTheNeutralLine()
{
// A thread with no account tag has no colour to lift, and must not end up
// with a saturated bar invented out of an invalid QColor.
QCOMPARE(CardDelegate::accentLineColour(QColor()),
ThreadListModel::threadLineColour());
}
QTEST_MAIN(TestCardDelegate)
#include "test_carddelegate.moc"
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