/*
    SPDX-FileCopyrightText: 2013 Jon Mease <jon.mease@gmail.com>

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

#include <QTest>

#include "../settings_core.h"
#include "core/document.h"
#include <QMimeDatabase>
#include <QMimeType>
#include <core/form.h>
#include <core/page.h>

class EditFormsTest : public QObject
{
    Q_OBJECT

private Q_SLOTS:
    void initTestCase();
    void cleanupTestCase();
    void init();
    void cleanup();

    void testRadioButtonForm();
    void testCheckBoxForm();
    void testTextLineForm();
    void testTextAreaForm();
    void testFileEditForm();
    void testComboEditForm();
    void testListSingleEdit();
    void testListMultiEdit();

    // helper methods
    void verifyRadioButtonStates(bool state1, bool state2, bool state3);
    void setRadioButtonStates(bool state1, bool state2, bool state3);
    void verifyTextForm(Okular::FormFieldText *form);

private:
    Okular::Document *m_document;
    QList<Okular::FormFieldButton *> m_radioButtonForms;
    QList<Okular::FormFieldButton *> m_checkBoxForms;
    Okular::FormFieldText *m_textLineForm;
    Okular::FormFieldText *m_textAreaForm;
    Okular::FormFieldText *m_fileEditForm;
    Okular::FormFieldChoice *m_comboEdit;
    Okular::FormFieldChoice *m_listSingleEdit;
    Okular::FormFieldChoice *m_listMultiEdit;
};

void EditFormsTest::initTestCase()
{
    Okular::SettingsCore::instance(QStringLiteral("editformstest"));
    m_document = new Okular::Document(nullptr);
}

void EditFormsTest::cleanupTestCase()
{
    delete m_document;
}

void EditFormsTest::init()
{
    const QString testFile = QStringLiteral(KDESRCDIR "data/formSamples.pdf");
    QMimeDatabase db;
    const QMimeType mime = db.mimeTypeForFile(testFile);
    QCOMPARE(m_document->openDocument(testFile, QUrl(), mime), Okular::Document::OpenSuccess);

    // Undo and Redo should be unavailable when docuemnt is first opened.
    QVERIFY(!m_document->canUndo());
    QVERIFY(!m_document->canRedo());

    const Okular::Page *page = m_document->page(0);
    const QList<Okular::FormField *> pageFields = page->formFields();

    // Clear lists
    m_checkBoxForms.clear();
    m_radioButtonForms.clear();

    // Collect forms of the various types
    for (Okular::FormField *ff : pageFields) {
        ff->type();

        switch (ff->type()) {
        case Okular::FormField::FormButton: {
            Okular::FormFieldButton *ffb = static_cast<Okular::FormFieldButton *>(ff);
            switch (ffb->buttonType()) {
            case Okular::FormFieldButton::Push:
                break;
            case Okular::FormFieldButton::CheckBox:
                m_checkBoxForms.append(ffb);
                break;
            case Okular::FormFieldButton::Radio:
                m_radioButtonForms.append(ffb);
                break;
            default:;
            }
            break;
        }
        case Okular::FormField::FormText: {
            Okular::FormFieldText *fft = static_cast<Okular::FormFieldText *>(ff);
            switch (fft->textType()) {
            case Okular::FormFieldText::Multiline:
                m_textAreaForm = fft;
                break;
            case Okular::FormFieldText::Normal:
                m_textLineForm = fft;
                break;
            case Okular::FormFieldText::FileSelect:
                m_fileEditForm = fft;
                break;
            }
            break;
        }
        case Okular::FormField::FormChoice: {
            Okular::FormFieldChoice *ffc = static_cast<Okular::FormFieldChoice *>(ff);
            switch (ffc->choiceType()) {
            case Okular::FormFieldChoice::ListBox:
                if (ffc->multiSelect()) {
                    m_listMultiEdit = ffc;
                } else {
                    m_listSingleEdit = ffc;
                }
                break;
            case Okular::FormFieldChoice::ComboBox:
                m_comboEdit = ffc;
                break;
            }
            break;
        }
        default:;
        }
    }
}

void EditFormsTest::cleanup()
{
    m_document->closeDocument();
}

void EditFormsTest::testRadioButtonForm()
{
    // Initially the first radio button is checked
    verifyRadioButtonStates(true, false, false);

    // Set the second radio to checked and make sure the first
    // is now unchecked and that an undo action is available
    setRadioButtonStates(false, true, false);
    verifyRadioButtonStates(false, true, false);
    QVERIFY(m_document->canUndo());

    // Now undo the action
    m_document->undo();
    verifyRadioButtonStates(true, false, false);
    QVERIFY(!m_document->canUndo());
    QVERIFY(m_document->canRedo());

    // Now redo the action
    m_document->redo();
    verifyRadioButtonStates(false, true, false);
    QVERIFY(m_document->canUndo());
    QVERIFY(!m_document->canRedo());
}

void EditFormsTest::testCheckBoxForm()
{
    // Examine the first and second checkboxes
    // Initially both checkboxes are unchecked
    QVERIFY(m_checkBoxForms[0]->state() == false);
    QVERIFY(m_checkBoxForms[1]->state() == false);

    // Set checkbox 1 to true
    m_document->editFormButtons(0, QList<Okular::FormFieldButton *>() << m_checkBoxForms[0], QList<bool>() << true);
    QVERIFY(m_checkBoxForms[0]->state() == true);
    QVERIFY(m_checkBoxForms[1]->state() == false);
    QVERIFY(m_document->canUndo());

    // Set checkbox 2 to true
    m_document->editFormButtons(0, QList<Okular::FormFieldButton *>() << m_checkBoxForms[1], QList<bool>() << true);
    QVERIFY(m_checkBoxForms[0]->state() == true);
    QVERIFY(m_checkBoxForms[1]->state() == true);
    QVERIFY(m_document->canUndo());

    // Undo checking of second checkbox
    m_document->undo();
    QVERIFY(m_checkBoxForms[0]->state() == true);
    QVERIFY(m_checkBoxForms[1]->state() == false);
    QVERIFY(m_document->canUndo());
    QVERIFY(m_document->canRedo());

    // Undo checking of first checkbox
    m_document->undo();
    QVERIFY(m_checkBoxForms[0]->state() == false);
    QVERIFY(m_checkBoxForms[1]->state() == false);
    QVERIFY(!m_document->canUndo());
    QVERIFY(m_document->canRedo());

    // Redo checking of first checkbox
    m_document->redo();
    QVERIFY(m_checkBoxForms[0]->state() == true);
    QVERIFY(m_checkBoxForms[1]->state() == false);
    QVERIFY(m_document->canUndo());
    QVERIFY(m_document->canRedo());
}

void EditFormsTest::testTextLineForm()
{
    verifyTextForm(m_textLineForm);
}

void EditFormsTest::testTextAreaForm()
{
    verifyTextForm(m_textAreaForm);
}

void EditFormsTest::testFileEditForm()
{
    verifyTextForm(m_fileEditForm);
}

void EditFormsTest::testComboEditForm()
{
    // Editable combo with predefined choices:
    //     - combo1
    //     - combo2
    //     - combo3

    // Initially no choice is selected
    QCOMPARE(m_comboEdit->currentChoices().length(), 0);
    QCOMPARE(m_comboEdit->editChoice(), QLatin1String(""));

    // Select first choice
    m_document->editFormCombo(0, m_comboEdit, QStringLiteral("combo1"), 0, 0, 0);
    QCOMPARE(m_comboEdit->currentChoices().length(), 1);
    QCOMPARE(m_comboEdit->currentChoices().constFirst(), 0);
    QCOMPARE(m_comboEdit->editChoice(), QLatin1String(""));
    QVERIFY(m_document->canUndo());
    QVERIFY(!m_document->canRedo());

    // Select third choice
    m_document->editFormCombo(0, m_comboEdit, QStringLiteral("combo3"), 0, 0, 0);
    QCOMPARE(m_comboEdit->currentChoices().length(), 1);
    QCOMPARE(m_comboEdit->currentChoices().constFirst(), 2);
    QCOMPARE(m_comboEdit->editChoice(), QLatin1String(""));
    QVERIFY(m_document->canUndo());
    QVERIFY(!m_document->canRedo());

    // Undo and verify that first choice is selected
    m_document->undo();
    QCOMPARE(m_comboEdit->currentChoices().length(), 1);
    QCOMPARE(m_comboEdit->currentChoices().constFirst(), 0);
    QVERIFY(m_document->canUndo());
    QVERIFY(m_document->canRedo());

    // Redo and verify that third choice is selected
    m_document->redo();
    QCOMPARE(m_comboEdit->currentChoices().length(), 1);
    QCOMPARE(m_comboEdit->currentChoices().constFirst(), 2);
    QVERIFY(m_document->canUndo());
    QVERIFY(!m_document->canRedo());

    // Select a custom choice and verify that no predefined choices are selected
    m_document->editFormCombo(0, m_comboEdit, QStringLiteral("comboEdit"), 0, 0, 0);
    QCOMPARE(m_comboEdit->currentChoices().length(), 0);
    QCOMPARE(m_comboEdit->editChoice(), QStringLiteral("comboEdit"));
    QVERIFY(m_document->canUndo());
    QVERIFY(!m_document->canRedo());

    // Undo and verify that third choice is selected
    m_document->undo();
    QCOMPARE(m_comboEdit->currentChoices().length(), 1);
    QCOMPARE(m_comboEdit->currentChoices().constFirst(), 2);
    QVERIFY(m_document->canUndo());
    QVERIFY(m_document->canRedo());
}

void EditFormsTest::testListSingleEdit()
{
    // A list with three items that allows only single selections
    // Initially no choice is selected
    QCOMPARE(m_listSingleEdit->currentChoices().length(), 0);

    // Select first item
    m_document->editFormList(0, m_listSingleEdit, QList<int>() << 0);
    QCOMPARE(m_listSingleEdit->currentChoices().length(), 1);
    QCOMPARE(m_listSingleEdit->currentChoices().constFirst(), 0);
    QVERIFY(m_document->canUndo());
    QVERIFY(!m_document->canRedo());

    // Select second item
    m_document->editFormList(0, m_listSingleEdit, QList<int>() << 1);
    QCOMPARE(m_listSingleEdit->currentChoices().length(), 1);
    QCOMPARE(m_listSingleEdit->currentChoices().constFirst(), 1);
    QVERIFY(m_document->canUndo());
    QVERIFY(!m_document->canRedo());

    // Undo and verify that first item is selected
    m_document->undo();
    QCOMPARE(m_listSingleEdit->currentChoices().length(), 1);
    QCOMPARE(m_listSingleEdit->currentChoices().constFirst(), 0);
    QVERIFY(m_document->canUndo());
    QVERIFY(m_document->canRedo());

    // Redo and verify that second item is selected
    m_document->redo();
    QCOMPARE(m_listSingleEdit->currentChoices().length(), 1);
    QCOMPARE(m_listSingleEdit->currentChoices().constFirst(), 1);
    QVERIFY(m_document->canUndo());
    QVERIFY(!m_document->canRedo());
}

void EditFormsTest::testListMultiEdit()
{
    // A list with three items that allows for multiple selections
    // Initially no choice is selected
    QCOMPARE(m_listMultiEdit->currentChoices().length(), 0);

    // Select first item
    m_document->editFormList(0, m_listMultiEdit, QList<int>() << 0);
    QCOMPARE(m_listMultiEdit->currentChoices(), QList<int>() << 0);
    QVERIFY(m_document->canUndo());
    QVERIFY(!m_document->canRedo());

    // Select first and third items
    m_document->editFormList(0, m_listMultiEdit, QList<int>() << 0 << 2);
    QCOMPARE(m_listMultiEdit->currentChoices(), QList<int>() << 0 << 2);
    QVERIFY(m_document->canUndo());
    QVERIFY(!m_document->canRedo());

    // Select all three items
    m_document->editFormList(0, m_listMultiEdit, QList<int>() << 0 << 1 << 2);
    QCOMPARE(m_listMultiEdit->currentChoices(), QList<int>() << 0 << 1 << 2);
    QVERIFY(m_document->canUndo());
    QVERIFY(!m_document->canRedo());

    // Undo and verify that first and third items are selected
    m_document->undo();
    QCOMPARE(m_listMultiEdit->currentChoices(), QList<int>() << 0 << 2);
    QVERIFY(m_document->canUndo());
    QVERIFY(m_document->canRedo());

    // Undo and verify that first item is selected
    m_document->undo();
    QCOMPARE(m_listMultiEdit->currentChoices(), QList<int>() << 0);
    QVERIFY(m_document->canUndo());
    QVERIFY(m_document->canRedo());

    // Redo and verify that first and third items are selected
    m_document->redo();
    QCOMPARE(m_listMultiEdit->currentChoices(), QList<int>() << 0 << 2);
    QVERIFY(m_document->canUndo());
    QVERIFY(m_document->canRedo());
}

// helper methods
void EditFormsTest::verifyRadioButtonStates(bool state1, bool state2, bool state3)
{
    QVERIFY(m_radioButtonForms[0]->state() == state1);
    QVERIFY(m_radioButtonForms[1]->state() == state2);
    QVERIFY(m_radioButtonForms[2]->state() == state3);
}

void EditFormsTest::setRadioButtonStates(bool state1, bool state2, bool state3)
{
    QList<bool> newButtonStates;
    newButtonStates.append(state1);
    newButtonStates.append(state2);
    newButtonStates.append(state3);
    m_document->editFormButtons(0, m_radioButtonForms, newButtonStates);
}

void EditFormsTest::verifyTextForm(Okular::FormFieldText *form)
{
    // Text in form is initially empty
    QCOMPARE(form->text(), QLatin1String(""));

    // Insert the string "Hello" into the form
    m_document->editFormText(0, form, QStringLiteral("Hello"), 5, 0, 0);
    QCOMPARE(form->text(), QStringLiteral("Hello"));
    QVERIFY(m_document->canUndo());
    QVERIFY(!m_document->canRedo());

    // Undo the insertion and verify that form is empty again
    m_document->undo();
    QCOMPARE(form->text(), QLatin1String(""));
    QVERIFY(!m_document->canUndo());
    QVERIFY(m_document->canRedo());

    // Redo the insertion of "Hello"
    m_document->redo();
    QCOMPARE(form->text(), QStringLiteral("Hello"));
    QVERIFY(m_document->canUndo());
    QVERIFY(!m_document->canRedo());

    // Type "_World" after "Hello"
    m_document->editFormText(0, form, QStringLiteral("Hello_"), 6, 5, 5);
    m_document->editFormText(0, form, QStringLiteral("Hello_W"), 7, 6, 6);
    m_document->editFormText(0, form, QStringLiteral("Hello_Wo"), 8, 7, 7);
    m_document->editFormText(0, form, QStringLiteral("Hello_Wor"), 9, 8, 8);
    m_document->editFormText(0, form, QStringLiteral("Hello_Worl"), 10, 9, 9);
    m_document->editFormText(0, form, QStringLiteral("Hello_World"), 11, 10, 10);

    // Verify that character insertion operations were merged together into a single undo command
    m_document->undo();
    QCOMPARE(form->text(), QStringLiteral("Hello"));
    QVERIFY(m_document->canUndo());
    QVERIFY(m_document->canRedo());

    // Verify that one more undo gets us back to the original state (empty form)
    m_document->undo();
    QCOMPARE(form->text(), QLatin1String(""));
    QVERIFY(!m_document->canUndo());
    QVERIFY(m_document->canRedo());
}

QTEST_MAIN(EditFormsTest)
#include "editformstest.moc"