// Copyright (C) 2016 Dmitry Savchenko
// Copyright (C) 2016 Vasiliy Sorokin
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0

#include "optionsdialog.h"

#include "constants.h"
#include "keyword.h"
#include "keyworddialog.h"
#include "settings.h"
#include "todotr.h"

#include <utils/layoutbuilder.h>

#include <QGroupBox>
#include <QListWidget>
#include <QPushButton>
#include <QRadioButton>

namespace Todo::Internal {

class OptionsDialog final : public Core::IOptionsPageWidget
{
public:
    OptionsDialog(Settings *settings, const std::function<void ()> &onApply);

    void apply() final;

    void setSettings(const Settings &settings);

private:
    void addKeywordButtonClicked();
    void editKeywordButtonClicked();
    void removeKeywordButtonClicked();
    void resetKeywordsButtonClicked();
    void setKeywordsButtonsEnabled();
    Settings settingsFromUi();
    void addToKeywordsList(const Keyword &keyword);
    void editKeyword(QListWidgetItem *item);
    QSet<QString> keywordNames();

    Settings *m_settings = nullptr;
    std::function<void()> m_onApply;

    QListWidget *m_keywordsList;
    QPushButton *m_editKeywordButton;
    QPushButton *m_removeKeywordButton;
    QPushButton *resetKeywordsButton;
    QRadioButton *m_scanInProjectRadioButton;
    QRadioButton *m_scanInCurrentFileRadioButton;
    QRadioButton *m_scanInSubprojectRadioButton;
};

OptionsDialog::OptionsDialog(Settings *settings, const std::function<void ()> &onApply)
    : m_settings(settings), m_onApply(onApply)
{
    m_keywordsList = new QListWidget;
    m_keywordsList->setDragDropMode(QAbstractItemView::DragDrop);
    m_keywordsList->setDefaultDropAction(Qt::MoveAction);
    m_keywordsList->setSelectionBehavior(QAbstractItemView::SelectRows);
    m_keywordsList->setSortingEnabled(false);

    auto addKeywordButton = new QPushButton(Tr::tr("Add"));
    m_editKeywordButton = new QPushButton(Tr::tr("Edit"));
    m_removeKeywordButton = new QPushButton(Tr::tr("Remove"));
    resetKeywordsButton = new QPushButton(Tr::tr("Reset"));

    m_scanInProjectRadioButton = new QRadioButton(Tr::tr("Scan the whole active project"));
    m_scanInProjectRadioButton->setEnabled(true);

    m_scanInCurrentFileRadioButton = new QRadioButton(Tr::tr("Scan only the currently edited document"));
    m_scanInCurrentFileRadioButton->setChecked(true);

    m_scanInSubprojectRadioButton = new QRadioButton(Tr::tr("Scan the current subproject"));

    using namespace Utils::Layouting;

    Column {
        Group {
            title(Tr::tr("Keywords")),
            Row {
                m_keywordsList,
                Column {
                    addKeywordButton,
                    m_editKeywordButton,
                    m_removeKeywordButton,
                    resetKeywordsButton,
                    st
                }
            }
        },
        Group {
            title(Tr::tr("Scanning scope")),
            Column {
                m_scanInProjectRadioButton,
                m_scanInCurrentFileRadioButton,
                m_scanInSubprojectRadioButton
            }
        }
    }.attachTo(this);

    m_keywordsList->setIconSize(QSize(16, 16));
    setKeywordsButtonsEnabled();
    connect(addKeywordButton, &QAbstractButton::clicked,
            this, &OptionsDialog::addKeywordButtonClicked);
    connect(m_removeKeywordButton, &QAbstractButton::clicked,
            this, &OptionsDialog::removeKeywordButtonClicked);
    connect(m_editKeywordButton, &QAbstractButton::clicked,
            this, &OptionsDialog::editKeywordButtonClicked);
    connect(resetKeywordsButton, &QAbstractButton::clicked,
            this, &OptionsDialog::resetKeywordsButtonClicked);
    connect(m_keywordsList, &QListWidget::itemDoubleClicked,
            this, &OptionsDialog::editKeyword);
    connect(m_keywordsList, &QListWidget::itemSelectionChanged,
            this, &OptionsDialog::setKeywordsButtonsEnabled);

    setSettings(*m_settings);
}

void OptionsDialog::addToKeywordsList(const Keyword &keyword)
{
    auto item = new QListWidgetItem(icon(keyword.iconType), keyword.name);
    item->setData(Qt::UserRole, static_cast<int>(keyword.iconType));
    item->setForeground(keyword.color);
    m_keywordsList->addItem(item);
}

QSet<QString> OptionsDialog::keywordNames()
{
    const KeywordList keywords = settingsFromUi().keywords;

    QSet<QString> result;
    for (const Keyword &keyword : keywords)
        result << keyword.name;

    return result;
}

void OptionsDialog::addKeywordButtonClicked()
{
    Keyword keyword;
    KeywordDialog keywordDialog(keyword, keywordNames(), this);
    if (keywordDialog.exec() == QDialog::Accepted) {
        keyword = keywordDialog.keyword();
        addToKeywordsList(keyword);
    }
}

void OptionsDialog::editKeywordButtonClicked()
{
    QListWidgetItem *item = m_keywordsList->currentItem();
    editKeyword(item);
}

void OptionsDialog::editKeyword(QListWidgetItem *item)
{
    Keyword keyword;
    keyword.name = item->text();
    keyword.iconType = static_cast<IconType>(item->data(Qt::UserRole).toInt());
    keyword.color = item->foreground().color();

    QSet<QString> keywordNamesButThis = keywordNames();
    keywordNamesButThis.remove(keyword.name);

    KeywordDialog keywordDialog(keyword, keywordNamesButThis, this);
    if (keywordDialog.exec() == QDialog::Accepted) {
        keyword = keywordDialog.keyword();
        item->setIcon(icon(keyword.iconType));
        item->setText(keyword.name);
        item->setData(Qt::UserRole, static_cast<int>(keyword.iconType));
        item->setForeground(keyword.color);
    }
}

void OptionsDialog::removeKeywordButtonClicked()
{
    delete m_keywordsList->takeItem(m_keywordsList->currentRow());
}

void OptionsDialog::resetKeywordsButtonClicked()
{
    Settings newSettings;
    newSettings.setDefault();
    setSettings(newSettings);
}

void OptionsDialog::setKeywordsButtonsEnabled()
{
    const bool isSomethingSelected = !m_keywordsList->selectedItems().isEmpty();
    m_removeKeywordButton->setEnabled(isSomethingSelected);
    m_editKeywordButton->setEnabled(isSomethingSelected);
}

void OptionsDialog::setSettings(const Settings &settings)
{
    m_scanInCurrentFileRadioButton->setChecked(settings.scanningScope == ScanningScopeCurrentFile);
    m_scanInProjectRadioButton->setChecked(settings.scanningScope == ScanningScopeProject);
    m_scanInSubprojectRadioButton->setChecked(settings.scanningScope == ScanningScopeSubProject);

    m_keywordsList->clear();
    for (const Keyword &keyword : std::as_const(settings.keywords))
        addToKeywordsList(keyword);
}

Settings OptionsDialog::settingsFromUi()
{
    Settings settings;

    if (m_scanInCurrentFileRadioButton->isChecked())
        settings.scanningScope = ScanningScopeCurrentFile;
    else if (m_scanInSubprojectRadioButton->isChecked())
        settings.scanningScope = ScanningScopeSubProject;
    else
        settings.scanningScope = ScanningScopeProject;

    settings.keywords.clear();
    for (int i = 0; i < m_keywordsList->count(); ++i) {
        QListWidgetItem *item = m_keywordsList->item(i);

        Keyword keyword;
        keyword.name = item->text();
        keyword.iconType = static_cast<IconType>(item->data(Qt::UserRole).toInt());
        keyword.color = item->foreground().color();

        settings.keywords << keyword;
    }

    return settings;
}

void OptionsDialog::apply()
{
    Settings newSettings = settingsFromUi();

    // "apply" itself is interpreted as "use these keywords, also for other themes".
    newSettings.keywordsEdited = true;

    if (newSettings == *m_settings)
        return;

    *m_settings = newSettings;
    m_onApply();
}

// TodoOptionsPage

TodoOptionsPage::TodoOptionsPage(Settings *settings, const std::function<void ()> &onApply)
{
    setId(Constants::TODO_SETTINGS);
    setDisplayName(Tr::tr("To-Do"));
    setCategory("To-Do");
    setDisplayCategory(Tr::tr("To-Do"));
    setCategoryIconPath(":/todoplugin/images/settingscategory_todo.png");
    setWidgetCreator([settings, onApply] { return new OptionsDialog(settings, onApply); });
}

} // Todo::Internal