/*
    This file is part of the KDE libraries
    SPDX-FileCopyrightText: 2008 Niko Sams <niko.sams\gmail.com>

    SPDX-License-Identifier: LGPL-2.0-or-later
*/

#include "completion_test.h"
#include "codecompletiontestmodels.h"
//#include "codecompletiontestmodels.moc"

#include <ksycoca.h>

#include <ktexteditor/document.h>
#include <ktexteditor/editor.h>

#include <katecompletionmodel.h>
#include <katecompletiontree.h>
#include <katecompletionwidget.h>
#include <kateconfig.h>
#include <kateglobal.h>
#include <katerenderer.h>
#include <kateview.h>

#include <QKeyEvent>
#include <QtTestWidgets>

QTEST_MAIN(CompletionTest)

using namespace KTextEditor;

int countItems(KateCompletionModel *model)
{
    const int topLevel = model->rowCount(QModelIndex());
    if (!model->hasGroups()) {
        return topLevel;
    }
    int ret = 0;
    for (int i = 0; i < topLevel; ++i) {
        ret += model->rowCount(model->index(i, 0));
    }
    return ret;
}

static void verifyCompletionStarted(KTextEditor::ViewPrivate *view)
{
    const QDateTime startTime = QDateTime::currentDateTime();
    while (startTime.msecsTo(QDateTime::currentDateTime()) < 1000) {
        QApplication::processEvents();
        if (view->completionWidget()->isCompletionActive()) {
            break;
        }
    }
    QVERIFY(view->completionWidget()->isCompletionActive());
}

static void verifyCompletionAborted(KTextEditor::ViewPrivate *view)
{
    const QDateTime startTime = QDateTime::currentDateTime();
    while (startTime.msecsTo(QDateTime::currentDateTime()) < 1000) {
        QApplication::processEvents();
        if (!view->completionWidget()->isCompletionActive()) {
            break;
        }
    }
    QVERIFY(!view->completionWidget()->isCompletionActive());
}

static void invokeCompletionBox(KTextEditor::ViewPrivate *view)
{
    view->userInvokedCompletion();
    verifyCompletionStarted(view);
}

void CompletionTest::init()
{
    KTextEditor::EditorPrivate::enableUnitTestMode();
    Editor *editor = KTextEditor::Editor::instance();
    QVERIFY(editor);

    m_doc = editor->createDocument(this);
    QVERIFY(m_doc);
    m_doc->setText(QStringLiteral("aa bb cc\ndd"));

    KTextEditor::View *v = m_doc->createView(nullptr);
    QApplication::setActiveWindow(v);
    m_view = static_cast<KTextEditor::ViewPrivate *>(v);
    Q_ASSERT(m_view);

    // view needs to be shown as completion won't work if the cursor is off screen
    m_view->show();
}

void CompletionTest::cleanup()
{
    delete m_view;
    delete m_doc;
}

void CompletionTest::testFilterEmptyRange()
{
    KateCompletionModel *model = m_view->completionWidget()->model();

    new CodeCompletionTestModel(m_view, QStringLiteral("a"));
    m_view->setCursorPosition(Cursor(0, 0));
    invokeCompletionBox(m_view);

    QCOMPARE(countItems(model), 40);
    m_view->insertText(QStringLiteral("aa"));
    QTest::qWait(1000); // process events
    QCOMPARE(countItems(model), 14);
}

void CompletionTest::testFilterWithRange()
{
    KateCompletionModel *model = m_view->completionWidget()->model();

    CodeCompletionTestModel *testModel = new CodeCompletionTestModel(m_view, QStringLiteral("a"));
    m_view->setCursorPosition(Cursor(0, 2));
    invokeCompletionBox(m_view);

    Range complRange = *m_view->completionWidget()->completionRange(testModel);
    QCOMPARE(complRange, Range(Cursor(0, 0), Cursor(0, 2)));
    QCOMPARE(countItems(model), 14);

    m_view->insertText(QStringLiteral("a"));
    QTest::qWait(1000); // process events
    QCOMPARE(countItems(model), 1);
}

void CompletionTest::testAbortCursorMovedOutOfRange()
{
    KateCompletionModel *model = m_view->completionWidget()->model();

    new CodeCompletionTestModel(m_view, QStringLiteral("a"));
    m_view->setCursorPosition(Cursor(0, 2));
    invokeCompletionBox(m_view);

    QCOMPARE(countItems(model), 14);
    QVERIFY(m_view->completionWidget()->isCompletionActive());

    m_view->setCursorPosition(Cursor(0, 4));
    QTest::qWait(1000); // process events
    QVERIFY(!m_view->completionWidget()->isCompletionActive());
}

void CompletionTest::testAbortInvalidText()
{
    KateCompletionModel *model = m_view->completionWidget()->model();

    new CodeCompletionTestModel(m_view, QStringLiteral("a"));
    m_view->setCursorPosition(Cursor(0, 2));
    invokeCompletionBox(m_view);

    QCOMPARE(countItems(model), 14);
    QVERIFY(m_view->completionWidget()->isCompletionActive());

    m_view->insertText(QStringLiteral("."));
    verifyCompletionAborted(m_view);
}

void CompletionTest::testCustomRange1()
{
    m_doc->setText(QStringLiteral("$aa bb cc\ndd"));
    KateCompletionModel *model = m_view->completionWidget()->model();

    CodeCompletionTestModel *testModel = new CustomRangeModel(m_view, QStringLiteral("$a"));
    m_view->setCursorPosition(Cursor(0, 3));
    invokeCompletionBox(m_view);

    Range complRange = *m_view->completionWidget()->completionRange(testModel);
    qDebug() << complRange;
    QCOMPARE(complRange, Range(Cursor(0, 0), Cursor(0, 3)));
    QCOMPARE(countItems(model), 14);

    m_view->insertText(QStringLiteral("a"));
    QTest::qWait(1000); // process events
    QCOMPARE(countItems(model), 1);
}

void CompletionTest::testCustomRange2()
{
    m_doc->setText(QStringLiteral("$ bb cc\ndd"));
    KateCompletionModel *model = m_view->completionWidget()->model();

    CodeCompletionTestModel *testModel = new CustomRangeModel(m_view, QStringLiteral("$a"));
    m_view->setCursorPosition(Cursor(0, 1));
    invokeCompletionBox(m_view);

    Range complRange = *m_view->completionWidget()->completionRange(testModel);
    QCOMPARE(complRange, Range(Cursor(0, 0), Cursor(0, 1)));
    QCOMPARE(countItems(model), 40);

    m_view->insertText(QStringLiteral("aa"));
    QTest::qWait(1000); // process events
    QCOMPARE(countItems(model), 14);
}

void CompletionTest::testCustomRangeMultipleModels()
{
    m_doc->setText(QStringLiteral("$a bb cc\ndd"));
    KateCompletionModel *model = m_view->completionWidget()->model();

    CodeCompletionTestModel *testModel1 = new CustomRangeModel(m_view, QStringLiteral("$a"));
    CodeCompletionTestModel *testModel2 = new CodeCompletionTestModel(m_view, QStringLiteral("a"));
    m_view->setCursorPosition(Cursor(0, 1));
    invokeCompletionBox(m_view);

    QCOMPARE(Range(*m_view->completionWidget()->completionRange(testModel1)), Range(Cursor(0, 0), Cursor(0, 2)));
    QCOMPARE(Range(*m_view->completionWidget()->completionRange(testModel2)), Range(Cursor(0, 1), Cursor(0, 2)));
    QCOMPARE(model->currentCompletion(testModel1), QStringLiteral("$"));
    QCOMPARE(model->currentCompletion(testModel2), QString());
    QCOMPARE(countItems(model), 80);

    m_view->insertText(QStringLiteral("aa"));
    QTest::qWait(1000); // process events
    QCOMPARE(model->currentCompletion(testModel1), QStringLiteral("$aa"));
    QCOMPARE(model->currentCompletion(testModel2), QStringLiteral("aa"));
    QCOMPARE(countItems(model), 14 * 2);
}

void CompletionTest::testAbortController()
{
    KateCompletionModel *model = m_view->completionWidget()->model();

    new CustomRangeModel(m_view, QStringLiteral("$a"));
    m_view->setCursorPosition(Cursor(0, 0));
    invokeCompletionBox(m_view);

    QCOMPARE(countItems(model), 40);
    QVERIFY(m_view->completionWidget()->isCompletionActive());

    m_view->insertText(QStringLiteral("$a"));
    QTest::qWait(1000); // process events
    QVERIFY(m_view->completionWidget()->isCompletionActive());

    m_view->insertText(QStringLiteral("."));
    verifyCompletionAborted(m_view);
}

void CompletionTest::testAbortControllerMultipleModels()
{
    KateCompletionModel *model = m_view->completionWidget()->model();

    CodeCompletionTestModel *testModel1 = new CodeCompletionTestModel(m_view, QStringLiteral("aa"));
    CodeCompletionTestModel *testModel2 = new CustomAbortModel(m_view, QStringLiteral("a-"));
    m_view->setCursorPosition(Cursor(0, 0));
    invokeCompletionBox(m_view);

    QCOMPARE(countItems(model), 80);
    QVERIFY(m_view->completionWidget()->isCompletionActive());

    m_view->insertText(QStringLiteral("a"));
    QTest::qWait(1000); // process events
    QVERIFY(m_view->completionWidget()->isCompletionActive());
    QCOMPARE(countItems(model), 80);

    m_view->insertText(QStringLiteral("-"));
    QTest::qWait(1000); // process events
    QVERIFY(m_view->completionWidget()->isCompletionActive());
    QVERIFY(!m_view->completionWidget()->completionRanges().contains(testModel1));
    QVERIFY(m_view->completionWidget()->completionRanges().contains(testModel2));

    QCOMPARE(countItems(model), 40);

    m_view->insertText(QLatin1String(" "));
    QTest::qWait(1000); // process events
    QVERIFY(!m_view->completionWidget()->isCompletionActive());
}

void CompletionTest::testEmptyFilterString()
{
    KateCompletionModel *model = m_view->completionWidget()->model();

    new EmptyFilterStringModel(m_view, QStringLiteral("aa"));
    m_view->setCursorPosition(Cursor(0, 0));
    invokeCompletionBox(m_view);

    QCOMPARE(countItems(model), 40);

    m_view->insertText(QStringLiteral("a"));
    QTest::qWait(1000); // process events
    QCOMPARE(countItems(model), 40);

    m_view->insertText(QStringLiteral("bam"));
    QTest::qWait(1000); // process events
    QCOMPARE(countItems(model), 40);
}

void CompletionTest::testUpdateCompletionRange()
{
    m_doc->setText(QStringLiteral("ab    bb cc\ndd"));
    KateCompletionModel *model = m_view->completionWidget()->model();

    CodeCompletionTestModel *testModel = new UpdateCompletionRangeModel(m_view, QStringLiteral("ab ab"));
    m_view->setCursorPosition(Cursor(0, 3));
    invokeCompletionBox(m_view);

    QCOMPARE(countItems(model), 40);
    QCOMPARE(Range(*m_view->completionWidget()->completionRange(testModel)), Range(Cursor(0, 3), Cursor(0, 3)));

    m_view->insertText(QStringLiteral("ab"));
    QTest::qWait(1000); // process events
    QCOMPARE(Range(*m_view->completionWidget()->completionRange(testModel)), Range(Cursor(0, 0), Cursor(0, 5)));
    QCOMPARE(countItems(model), 40);
}

void CompletionTest::testCustomStartCompl()
{
    KateCompletionModel *model = m_view->completionWidget()->model();

    m_view->completionWidget()->setAutomaticInvocationDelay(1);

    new StartCompletionModel(m_view, QStringLiteral("aa"));

    m_view->setCursorPosition(Cursor(0, 0));
    m_view->insertText("%");
    QTest::qWait(1000);

    QVERIFY(m_view->completionWidget()->isCompletionActive());
    QCOMPARE(countItems(model), 40);
}

void CompletionTest::testKateCompletionModel()
{
    KateCompletionModel *model = m_view->completionWidget()->model();
    CodeCompletionTestModel *testModel1 = new CodeCompletionTestModel(m_view, QStringLiteral("aa"));
    CodeCompletionTestModel *testModel2 = new CodeCompletionTestModel(m_view, QStringLiteral("bb"));

    model->setCompletionModel(testModel1);
    QCOMPARE(countItems(model), 40);

    model->addCompletionModel(testModel2);
    QCOMPARE(countItems(model), 80);

    model->removeCompletionModel(testModel2);
    QCOMPARE(countItems(model), 40);
}

void CompletionTest::testAbortImmideatelyAfterStart()
{
    new ImmideatelyAbortCompletionModel(m_view);
    m_view->setCursorPosition(Cursor(0, 3));
    QVERIFY(!m_view->completionWidget()->isCompletionActive());
    Q_EMIT m_view->userInvokedCompletion();
    QVERIFY(!m_view->completionWidget()->isCompletionActive());
}

void CompletionTest::testJumpToListBottomAfterCursorUpWhileAtTop()
{
    new CodeCompletionTestModel(m_view, QStringLiteral("aa"));
    invokeCompletionBox(m_view);

    m_view->completionWidget()->cursorUp();
    m_view->completionWidget()->bottom();
    // TODO - better way of finding the index?
    QCOMPARE(m_view->completionWidget()->treeView()->selectionModel()->currentIndex().row(), 39);
}

void CompletionTest::testAbbreviationEngine()
{
    QVERIFY(KateCompletionModel::matchesAbbreviation(QStringLiteral("FooBar"), QStringLiteral("fb"), Qt::CaseInsensitive));
    QVERIFY(KateCompletionModel::matchesAbbreviation(QStringLiteral("FooBar"), QStringLiteral("foob"), Qt::CaseInsensitive));
    QVERIFY(KateCompletionModel::matchesAbbreviation(QStringLiteral("FooBar"), QStringLiteral("fbar"), Qt::CaseInsensitive));
    QVERIFY(KateCompletionModel::matchesAbbreviation(QStringLiteral("FooBar"), QStringLiteral("fba"), Qt::CaseInsensitive));
    QVERIFY(KateCompletionModel::matchesAbbreviation(QStringLiteral("FooBar"), QStringLiteral("foba"), Qt::CaseInsensitive));
    QVERIFY(KateCompletionModel::matchesAbbreviation(QStringLiteral("FooBarBazBang"), QStringLiteral("fbbb"), Qt::CaseInsensitive));
    QVERIFY(KateCompletionModel::matchesAbbreviation(QStringLiteral("foo_bar_cat"), QStringLiteral("fbc"), Qt::CaseInsensitive));
    QVERIFY(KateCompletionModel::matchesAbbreviation(QStringLiteral("foo_bar_cat"), QStringLiteral("fb"), Qt::CaseInsensitive));
    QVERIFY(KateCompletionModel::matchesAbbreviation(QStringLiteral("FooBarArr"), QStringLiteral("fba"), Qt::CaseInsensitive));
    QVERIFY(KateCompletionModel::matchesAbbreviation(QStringLiteral("FooBarArr"), QStringLiteral("fbara"), Qt::CaseInsensitive));
    QVERIFY(KateCompletionModel::matchesAbbreviation(QStringLiteral("FooBarArr"), QStringLiteral("fobaar"), Qt::CaseInsensitive));
    QVERIFY(KateCompletionModel::matchesAbbreviation(QStringLiteral("FooBarArr"), QStringLiteral("fb"), Qt::CaseInsensitive));

    QVERIFY(KateCompletionModel::matchesAbbreviation(QStringLiteral("QualifiedIdentifier"), QStringLiteral("qid"), Qt::CaseInsensitive));
    QVERIFY(KateCompletionModel::matchesAbbreviation(QStringLiteral("QualifiedIdentifier"), QStringLiteral("qualid"), Qt::CaseInsensitive));
    QVERIFY(KateCompletionModel::matchesAbbreviation(QStringLiteral("QualifiedIdentifier"), QStringLiteral("qualidentifier"), Qt::CaseInsensitive));
    QVERIFY(KateCompletionModel::matchesAbbreviation(QStringLiteral("QualifiedIdentifier"), QStringLiteral("qi"), Qt::CaseInsensitive));
    QVERIFY(KateCompletionModel::matchesAbbreviation(QStringLiteral("KateCompletionModel"), QStringLiteral("kcmodel"), Qt::CaseInsensitive));
    QVERIFY(KateCompletionModel::matchesAbbreviation(QStringLiteral("KateCompletionModel"), QStringLiteral("kc"), Qt::CaseInsensitive));
    QVERIFY(KateCompletionModel::matchesAbbreviation(QStringLiteral("KateCompletionModel"), QStringLiteral("kcomplmodel"), Qt::CaseInsensitive));
    QVERIFY(KateCompletionModel::matchesAbbreviation(QStringLiteral("KateCompletionModel"), QStringLiteral("kacomplmodel"), Qt::CaseInsensitive));
    QVERIFY(KateCompletionModel::matchesAbbreviation(QStringLiteral("KateCompletionModel"), QStringLiteral("kacom"), Qt::CaseInsensitive));

    QVERIFY(!KateCompletionModel::matchesAbbreviation(QStringLiteral("QualifiedIdentifier"), QStringLiteral("identifier"), Qt::CaseInsensitive));
    QVERIFY(!KateCompletionModel::matchesAbbreviation(QStringLiteral("FooBarArr"), QStringLiteral("fobaara"), Qt::CaseInsensitive));
    QVERIFY(!KateCompletionModel::matchesAbbreviation(QStringLiteral("FooBarArr"), QStringLiteral("fbac"), Qt::CaseInsensitive));
    QVERIFY(!KateCompletionModel::matchesAbbreviation(QStringLiteral("KateCompletionModel"), QStringLiteral("kamodel"), Qt::CaseInsensitive));

    QVERIFY(
        KateCompletionModel::matchesAbbreviation(QStringLiteral("AbcdefBcdefCdefDefEfFzZ"), QStringLiteral("AbcdefBcdefCdefDefEfFzZ"), Qt::CaseInsensitive));
    QVERIFY(!KateCompletionModel::matchesAbbreviation(QStringLiteral("AbcdefBcdefCdefDefEfFzZ"), QStringLiteral("ABCDEFX"), Qt::CaseInsensitive));
    QVERIFY(!KateCompletionModel::matchesAbbreviation(QStringLiteral("AaaaaaBbbbbCcccDddEeFzZ"), QStringLiteral("XZYBFA"), Qt::CaseInsensitive));

    QVERIFY(!KateCompletionModel::matchesAbbreviation(QStringLiteral("FooBar"), QStringLiteral("fb"), Qt::CaseSensitive));
    QVERIFY(KateCompletionModel::matchesAbbreviation(QStringLiteral("FooBar"), QStringLiteral("FB"), Qt::CaseSensitive));
    QVERIFY(!KateCompletionModel::matchesAbbreviation(QStringLiteral("KateCompletionModel"), QStringLiteral("kcmodel"), Qt::CaseSensitive));
    QVERIFY(KateCompletionModel::matchesAbbreviation(QStringLiteral("KateCompletionModel"), QStringLiteral("KCModel"), Qt::CaseSensitive));
}

void CompletionTest::testAutoCompletionPreselectFirst()
{
    new CodeCompletionTestModel(m_view, QStringLiteral("a"));

    m_view->config()->setValue(KateViewConfig::AutomaticCompletionPreselectFirst, false);
    // When AutomaticCompletionPreselectFirst is disabled, immediately pressing enter
    // should result into a newline instead of completion
    m_doc->setText("a");
    m_view->setCursorPosition(Cursor(0, 1));
    m_view->completionWidget()->automaticInvocation();
    verifyCompletionStarted(m_view);
    auto enterKeyEvent = QKeyEvent(QEvent::KeyPress, Qt::Key_Enter, Qt::NoModifier);
    QApplication::sendEvent(m_view->focusProxy(), &enterKeyEvent);

    verifyCompletionAborted(m_view);
    QCOMPARE(m_doc->text(), "a\n");

    // When no completion entry is selected, tab key should select the first entry
    m_doc->setText("a");
    m_view->completionWidget()->automaticInvocation();
    m_view->completionWidget()->tab(false);
    m_view->completionWidget()->execute();

    QVERIFY(!m_view->completionWidget()->isCompletionActive());
    QCOMPARE(m_doc->text(), "aaa0");

    // Ensure that auto completion still works when AutomaticCompletionPreselectFirst is enabled (default)
    m_view->config()->setValue(KateViewConfig::AutomaticCompletionPreselectFirst, true);
    m_doc->setText("a");
    m_view->completionWidget()->automaticInvocation();

    m_view->completionWidget()->tab(false); // tab should "auto-fill" completion
    QCOMPARE(m_doc->text(), "aa");
    m_view->completionWidget()->execute();
    QCOMPARE(m_doc->text(), "aaa0");
    QVERIFY(!m_view->completionWidget()->isCompletionActive());
}

void CompletionTest::benchAbbreviationEngineGoodCase()
{
    QBENCHMARK {
        for (int i = 0; i < 10000; i++) {
            QVERIFY(!KateCompletionModel::matchesAbbreviation(QStringLiteral("AaaaaaBbbbbCcccDddEeFzZ"), QStringLiteral("XZYBFA"), Qt::CaseInsensitive));
        }
    }
}

void CompletionTest::benchAbbreviationEngineNormalCase()
{
    QBENCHMARK {
        for (int i = 0; i < 10000; i++) {
            QVERIFY(!KateCompletionModel::matchesAbbreviation(QStringLiteral("AaaaaaBbbbbCcccDddEeFzZ"), QStringLiteral("ABCDEFX"), Qt::CaseInsensitive));
        }
    }
}

void CompletionTest::benchAbbreviationEngineWorstCase()
{
    QBENCHMARK {
        for (int i = 0; i < 10000; i++) {
            // This case is quite horrible, because it requires a branch at every letter.
            // The current code will at some point drop out and just return false.
            KateCompletionModel::matchesAbbreviation(QStringLiteral("XxBbbbbbBbbbbbBbbbbBbbbBbbbbbbBbbbbbBbbbbbBbbbFox"),
                                                     QStringLiteral("XbbbbbbbbbbbbbbbbbbbbFx"),
                                                     Qt::CaseInsensitive);
        }
    }
}

void CompletionTest::testAbbrevAndContainsMatching()
{
    KateCompletionModel *model = m_view->completionWidget()->model();

    new AbbreviationCodeCompletionTestModel(m_view, QString());

    m_view->document()->setText(QStringLiteral("SCA"));
    invokeCompletionBox(m_view);
    QCOMPARE(model->filteredItemCount(), (uint)6);

    m_view->document()->setText(QStringLiteral("SC"));
    invokeCompletionBox(m_view);
    QCOMPARE(model->filteredItemCount(), (uint)6);

    m_view->document()->setText(QStringLiteral("sca"));
    invokeCompletionBox(m_view);
    QCOMPARE(model->filteredItemCount(), (uint)6);

    m_view->document()->setText(QStringLiteral("contains"));
    invokeCompletionBox(m_view);
    QCOMPARE(model->filteredItemCount(), (uint)2);

    m_view->document()->setText(QStringLiteral("CONTAINS"));
    invokeCompletionBox(m_view);
    QCOMPARE(model->filteredItemCount(), (uint)2);

    m_view->document()->setText(QStringLiteral("containssome"));
    invokeCompletionBox(m_view);
    QCOMPARE(model->filteredItemCount(), (uint)1);

    m_view->document()->setText(QStringLiteral("matched"));
    m_view->userInvokedCompletion();
    QApplication::processEvents();
    QCOMPARE(model->filteredItemCount(), (uint)0);
}

void CompletionTest::benchCompletionModel()
{
    const QString text("abcdefg abcdef");
    m_doc->setText(text);
    CodeCompletionTestModel *testModel1 = new CodeCompletionTestModel(m_view, QStringLiteral("abcdefg"));
    testModel1->setRowCount(500);
    CodeCompletionTestModel *testModel2 = new CodeCompletionTestModel(m_view, QStringLiteral("abcdef"));
    testModel2->setRowCount(500);
    CodeCompletionTestModel *testModel3 = new CodeCompletionTestModel(m_view, QStringLiteral("abcde"));
    testModel3->setRowCount(500);
    CodeCompletionTestModel *testModel4 = new CodeCompletionTestModel(m_view, QStringLiteral("abcd"));
    testModel4->setRowCount(5000);
    QBENCHMARK_ONCE {
        for (int i = 0; i < text.size(); ++i) {
            m_view->setCursorPosition(Cursor(0, i));
            invokeCompletionBox(m_view);
        }
    }
}