#include "searchpanel.h"

#include <QVBoxLayout>
#include <QToolButton>
#include <QLabel>
#include <QFormLayout>
#include <QComboBox>
#include <QCheckBox>
#include <QLineEdit>
#include <QCompleter>
#include <QGridLayout>
#include <QProgressBar>
#include <QPlainTextEdit>
#include <QCoreApplication>
#include <QRadioButton>
#include <QButtonGroup>
#include <QScrollArea>

#include <core/configmgr.h>
#include <core/sessionconfig.h>
#include <core/widgetconfig.h>
#include <core/vnotex.h>
#include <core/fileopenparameters.h>
#include <notebook/node.h>
#include <notebook/notebook.h>
#include "widgetsfactory.h"
#include "titlebar.h"
#include "propertydefs.h"
#include "mainwindow.h"
#include <search/searchtoken.h>
#include <search/searchresultitem.h>
#include <search/isearchinfoprovider.h>
#include <search/searchhelper.h>
#include <utils/widgetutils.h>
#include "locationlist.h"

using namespace vnotex;

SearchPanel::SearchPanel(const QSharedPointer<ISearchInfoProvider> &p_provider, QWidget *p_parent)
    : QFrame(p_parent),
      m_provider(p_provider)
{
    qRegisterMetaType<QVector<QSharedPointer<SearchResultItem>>>("QVector<QSharedPointer<SearchResultItem>>");

    qRegisterMetaType<QSharedPointer<SearchResultItem>>("QSharedPointer<SearchResultItem>");

    qRegisterMetaType<SearchState>("SearchState");

    setupUI();

    initOptions();

    restoreFields(*m_option);
}

void SearchPanel::setupUI()
{
    auto layout = new QVBoxLayout(this);
    WidgetUtils::setContentsMargins(layout);

    // Title.
    {
        auto titleBar = setupTitleBar(QString(), this);
        layout->addWidget(titleBar);
    }

    // Body.
    auto scrollArea = new QScrollArea(this);
    scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    scrollArea->setWidgetResizable(true);
    layout->addWidget(scrollArea);

    auto mainWidget = new QWidget(scrollArea);
    scrollArea->setWidget(mainWidget);

    m_mainLayout = new QVBoxLayout(mainWidget);
    WidgetUtils::setContentsMargins(m_mainLayout);

    auto inputsLayout = WidgetsFactory::createFormLayout();
    m_mainLayout->addLayout(inputsLayout);

    m_keywordComboBox = WidgetsFactory::createComboBox(mainWidget);
    m_keywordComboBox->setToolTip(SearchToken::getHelpText());
    m_keywordComboBox->setEditable(true);
    m_keywordComboBox->setLineEdit(WidgetsFactory::createLineEdit(mainWidget));
    m_keywordComboBox->lineEdit()->setProperty(PropertyDefs::c_embeddedLineEdit, true);
    m_keywordComboBox->lineEdit()->setClearButtonEnabled(true);
    m_keywordComboBox->completer()->setCaseSensitivity(Qt::CaseSensitive);
    connect(m_keywordComboBox->lineEdit(), &QLineEdit::returnPressed,
            this, [this]() {
                m_searchBtn->animateClick();
            });
    inputsLayout->addRow(tr("Keyword:"), m_keywordComboBox);

    m_searchScopeComboBox = WidgetsFactory::createComboBox(mainWidget);
    m_searchScopeComboBox->addItem(tr("Buffers"), static_cast<int>(SearchScope::Buffers));
    m_searchScopeComboBox->addItem(tr("Current Folder"), static_cast<int>(SearchScope::CurrentFolder));
    m_searchScopeComboBox->addItem(tr("Current Notebook"), static_cast<int>(SearchScope::CurrentNotebook));
    m_searchScopeComboBox->addItem(tr("All Notebooks"), static_cast<int>(SearchScope::AllNotebooks));
    inputsLayout->addRow(tr("Scope:"), m_searchScopeComboBox);

    {
        // Advanced settings.
        m_advancedSettings = new QWidget(mainWidget);
        inputsLayout->addRow(m_advancedSettings);

        auto advLayout = WidgetsFactory::createFormLayout(m_advancedSettings);
        advLayout->setContentsMargins(0, 0, 0, 0);

        setupSearchObject(advLayout, m_advancedSettings);

        setupSearchTarget(advLayout, m_advancedSettings);

        m_filePatternComboBox = WidgetsFactory::createComboBox(m_advancedSettings);
        m_filePatternComboBox->setEditable(true);
        m_filePatternComboBox->setLineEdit(WidgetsFactory::createLineEdit(m_advancedSettings));
        m_filePatternComboBox->lineEdit()->setPlaceholderText(tr("Wildcard pattern of files to search"));
        m_filePatternComboBox->lineEdit()->setProperty(PropertyDefs::c_embeddedLineEdit, true);
        m_filePatternComboBox->completer()->setCaseSensitivity(Qt::CaseSensitive);
        advLayout->addRow(tr("File pattern:"), m_filePatternComboBox);

        setupFindOption(advLayout, m_advancedSettings);
    }

    {
        // TODO: use a global progress bar.
        m_progressBar = new QProgressBar(mainWidget);
        m_progressBar->setRange(0, 0);
        m_progressBar->hide();
        m_mainLayout->addWidget(m_progressBar);
    }

    m_mainLayout->addStretch();
}

TitleBar *SearchPanel::setupTitleBar(const QString &p_title, QWidget *p_parent)
{
    auto titleBar = new TitleBar(p_title, false, TitleBar::Action::None, p_parent);
    titleBar->setActionButtonsAlwaysShown(true);

    {
        m_searchBtn = titleBar->addActionButton(QStringLiteral("search.svg"), tr("Search"));
        connect(m_searchBtn, &QToolButton::triggered,
                this, &SearchPanel::startSearch);

        auto cancelBtn = titleBar->addActionButton(QStringLiteral("cancel.svg"), tr("Cancel"));
        connect(cancelBtn, &QToolButton::triggered,
                this, &SearchPanel::stopSearch);

        auto toggleLocationListBtn = titleBar->addActionButton(QStringLiteral("search_location_list.svg"), tr("Toggle Location List"));
        connect(toggleLocationListBtn, &QToolButton::triggered,
                this, []() {
                    VNoteX::getInst().getMainWindow()->toggleLocationListVisible();
                });

        m_advancedSettingsBtn = titleBar->addActionButton(QStringLiteral("advanced_settings.svg"), tr("Advanced Settings"));
        m_advancedSettingsBtn->defaultAction()->setCheckable(true);
        connect(m_advancedSettingsBtn, &QToolButton::triggered,
                this, [this](QAction *p_act) {
                    m_advancedSettings->setVisible(p_act->isChecked());
                });
    }

    return titleBar;
}

void SearchPanel::setupSearchObject(QFormLayout *p_layout, QWidget *p_parent)
{
    auto gridLayout = new QGridLayout();
    gridLayout->setContentsMargins(0, 0, 0, 0);
    p_layout->addRow(tr("Object:"), gridLayout);

    m_searchObjectNameCheckBox = WidgetsFactory::createCheckBox(tr("Name"), p_parent);
    gridLayout->addWidget(m_searchObjectNameCheckBox, 0, 0);

    m_searchObjectContentCheckBox = WidgetsFactory::createCheckBox(tr("Content"), p_parent);
    gridLayout->addWidget(m_searchObjectContentCheckBox, 0, 1);

    m_searchObjectTagCheckBox = WidgetsFactory::createCheckBox(tr("Tag"), p_parent);
    gridLayout->addWidget(m_searchObjectTagCheckBox, 1, 0);

    m_searchObjectPathCheckBox = WidgetsFactory::createCheckBox(tr("Path"), p_parent);
    gridLayout->addWidget(m_searchObjectPathCheckBox, 1, 1);
}

void SearchPanel::setupSearchTarget(QFormLayout *p_layout, QWidget *p_parent)
{
    auto gridLayout = new QGridLayout();
    gridLayout->setContentsMargins(0, 0, 0, 0);
    p_layout->addRow(tr("Target:"), gridLayout);

    m_searchTargetFileCheckBox = WidgetsFactory::createCheckBox(tr("File"), p_parent);
    gridLayout->addWidget(m_searchTargetFileCheckBox, 0, 0);

    m_searchTargetFolderCheckBox = WidgetsFactory::createCheckBox(tr("Folder"), p_parent);
    gridLayout->addWidget(m_searchTargetFolderCheckBox, 0, 1);

    m_searchTargetNotebookCheckBox = WidgetsFactory::createCheckBox(tr("Notebook"), p_parent);
    gridLayout->addWidget(m_searchTargetNotebookCheckBox, 1, 0);
}

void SearchPanel::setupFindOption(QFormLayout *p_layout, QWidget *p_parent)
{
    auto gridLayout = new QGridLayout();
    gridLayout->setContentsMargins(0, 0, 0, 0);
    p_layout->addRow(tr("Option:"), gridLayout);

    m_caseSensitiveCheckBox = WidgetsFactory::createCheckBox(tr("&Case sensitive"), p_parent);
    gridLayout->addWidget(m_caseSensitiveCheckBox, 0, 0);

    {
        QButtonGroup *btnGroup = new QButtonGroup(p_parent);

        m_plainTextRadioBtn = WidgetsFactory::createRadioButton(tr("&Plain text"), p_parent);
        btnGroup->addButton(m_plainTextRadioBtn);
        gridLayout->addWidget(m_plainTextRadioBtn, 1, 0);

        m_wholeWordOnlyRadioBtn = WidgetsFactory::createRadioButton(tr("&Whole word only"), p_parent);
        btnGroup->addButton(m_wholeWordOnlyRadioBtn);
        gridLayout->addWidget(m_wholeWordOnlyRadioBtn, 2, 0);

        m_fuzzySearchRadioBtn = WidgetsFactory::createRadioButton(tr("&Fuzzy search"), p_parent);
        btnGroup->addButton(m_fuzzySearchRadioBtn);
        gridLayout->addWidget(m_fuzzySearchRadioBtn, 3, 0);

        m_regularExpressionRadioBtn = WidgetsFactory::createRadioButton(tr("Re&gular expression"), p_parent);
        btnGroup->addButton(m_regularExpressionRadioBtn);
        gridLayout->addWidget(m_regularExpressionRadioBtn, 4, 0);
    }
}

void SearchPanel::initOptions()
{
    // Read search option from config.
    m_option = QSharedPointer<SearchOption>::create(ConfigMgr::getInst().getSessionConfig().getSearchOption());

    connect(VNoteX::getInst().getMainWindow(), &MainWindow::mainWindowClosedOnQuit,
            this, [this]() {
                saveFields(*m_option);
                ConfigMgr::getInst().getSessionConfig().setSearchOption(*m_option);
            });

    // Init layout.
    const auto &widgetConfig = ConfigMgr::getInst().getWidgetConfig();
    m_advancedSettingsBtn->defaultAction()->setChecked(widgetConfig.isSearchPanelAdvancedSettingsVisible());
}

void SearchPanel::restoreFields(const SearchOption &p_option)
{
    m_keywordComboBox->setEditText(p_option.m_keyword);
    m_filePatternComboBox->setEditText(p_option.m_filePattern);

    {
        int idx = m_searchScopeComboBox->findData(static_cast<int>(p_option.m_scope));
        if (idx != -1) {
            m_searchScopeComboBox->setCurrentIndex(idx);
        }
    }

    {
        m_searchObjectNameCheckBox->setChecked(p_option.m_objects & SearchObject::SearchName);
        m_searchObjectContentCheckBox->setChecked(p_option.m_objects & SearchObject::SearchContent);
        m_searchObjectTagCheckBox->setChecked(p_option.m_objects & SearchObject::SearchTag);
        m_searchObjectPathCheckBox->setChecked(p_option.m_objects & SearchObject::SearchPath);
    }

    {
        m_searchTargetFileCheckBox->setChecked(p_option.m_targets & SearchTarget::SearchFile);
        m_searchTargetFolderCheckBox->setChecked(p_option.m_targets & SearchTarget::SearchFolder);
        m_searchTargetNotebookCheckBox->setChecked(p_option.m_targets & SearchTarget::SearchNotebook);
    }

    {
        m_plainTextRadioBtn->setChecked(true);

        m_caseSensitiveCheckBox->setChecked(p_option.m_findOptions & FindOption::CaseSensitive);
        m_wholeWordOnlyRadioBtn->setChecked(p_option.m_findOptions & FindOption::WholeWordOnly);
        m_fuzzySearchRadioBtn->setChecked(p_option.m_findOptions & FindOption::FuzzySearch);
        m_regularExpressionRadioBtn->setChecked(p_option.m_findOptions & FindOption::RegularExpression);
    }
}

void SearchPanel::updateUIOnSearch()
{
    if (m_searchOngoing) {
        m_progressBar->setMaximum(0);
        m_progressBar->show();
    } else {
        m_progressBar->hide();
    }
}

void SearchPanel::startSearch()
{
    if (m_searchOngoing) {
        return;
    }

    // On start.
    {
        clearLog();
        m_searchOngoing = true;
        updateUIOnSearch();

        prepareLocationList();
    }

    saveFields(*m_option);

    QString msg;
    auto state = SearchHelper::searchOnProvider(getSearcher(), m_option, m_provider, msg);
    if (!msg.isEmpty()) {
        appendLog(msg);
    }

    // On end.
    handleSearchFinished(state);
}

void SearchPanel::handleSearchFinished(SearchState p_state)
{
    Q_ASSERT(m_searchOngoing);
    Q_ASSERT(p_state != SearchState::Idle);

    if (p_state != SearchState::Busy) {
        appendLog(tr("Search finished: %1").arg(SearchStateToString(p_state)));

        getSearcher()->clear();
        m_searchOngoing = false;
        updateUIOnSearch();
    }
}

void SearchPanel::stopSearch()
{
    if (!m_searchOngoing) {
        return;
    }

    getSearcher()->stop();
}

void SearchPanel::appendLog(const QString &p_text)
{
    if (p_text.isEmpty()) {
        return;
    }

    if (!m_infoTextEdit) {
        m_infoTextEdit = WidgetsFactory::createPlainTextConsole(this);
        m_infoTextEdit->setMaximumHeight(m_infoTextEdit->minimumSizeHint().height());
        // Before progress bar.
        m_mainLayout->insertWidget(m_mainLayout->count() - 1, m_infoTextEdit);
    }

    m_infoTextEdit->appendPlainText(">>> " + p_text);
    m_infoTextEdit->ensureCursorVisible();
    m_infoTextEdit->show();

    QCoreApplication::sendPostedEvents();
}

void SearchPanel::clearLog()
{
    if (!m_infoTextEdit) {
        return;
    }

    m_infoTextEdit->clear();
    m_infoTextEdit->hide();
}

void SearchPanel::saveFields(SearchOption &p_option)
{
    p_option.m_keyword = m_keywordComboBox->currentText().trimmed();
    p_option.m_filePattern = m_filePatternComboBox->currentText().trimmed();
    p_option.m_scope = static_cast<SearchScope>(m_searchScopeComboBox->currentData().toInt());

    {
        p_option.m_objects = SearchObject::ObjectNone;
        if (m_searchObjectNameCheckBox->isChecked()) {
            p_option.m_objects |= SearchObject::SearchName;
        }
        if (m_searchObjectContentCheckBox->isChecked()) {
            p_option.m_objects |= SearchObject::SearchContent;
        }
        if (m_searchObjectTagCheckBox->isChecked()) {
            p_option.m_objects |= SearchObject::SearchTag;
        }
        if (m_searchObjectPathCheckBox->isChecked()) {
            p_option.m_objects |= SearchObject::SearchPath;
        }
    }

    {
        p_option.m_targets = SearchTarget::TargetNone;
        if (m_searchTargetFileCheckBox->isChecked()) {
            p_option.m_targets |= SearchTarget::SearchFile;
        }
        if (m_searchTargetFolderCheckBox->isChecked()) {
            p_option.m_targets |= SearchTarget::SearchFolder;
        }
        if (m_searchTargetNotebookCheckBox->isChecked()) {
            p_option.m_targets |= SearchTarget::SearchNotebook;
        }
    }

    p_option.m_engine = SearchEngine::Internal;

    {
        p_option.m_findOptions = FindOption::FindNone;
        if (m_caseSensitiveCheckBox->isChecked()) {
            p_option.m_findOptions |= FindOption::CaseSensitive;
        }
        if (m_wholeWordOnlyRadioBtn->isChecked()) {
            p_option.m_findOptions |= FindOption::WholeWordOnly;
        }
        if (m_fuzzySearchRadioBtn->isChecked()) {
            p_option.m_findOptions |= FindOption::FuzzySearch;
        }
        if (m_regularExpressionRadioBtn->isChecked()) {
            p_option.m_findOptions |= FindOption::RegularExpression;
        }
    }
}

Searcher *SearchPanel::getSearcher()
{
    if (!m_searcher) {
        m_searcher = new Searcher(this);
        connect(m_searcher, &Searcher::progressUpdated,
                this, &SearchPanel::updateProgress);
        connect(m_searcher, &Searcher::logRequested,
                this, &SearchPanel::appendLog);
        connect(m_searcher, &Searcher::resultItemAdded,
                this, [this](const QSharedPointer<SearchResultItem> &p_item) {
                    m_locationList->addLocation(p_item->m_location);
                });
        connect(m_searcher, &Searcher::resultItemsAdded,
                this, [this](const QVector<QSharedPointer<SearchResultItem>> &p_items) {
                    for (const auto &item : p_items) {
                        m_locationList->addLocation(item->m_location);
                    }
                });
        connect(m_searcher, &Searcher::finished,
                this, &SearchPanel::handleSearchFinished);
    }
    return m_searcher;
}

void SearchPanel::updateProgress(int p_val, int p_maximum)
{
    m_progressBar->setMaximum(p_maximum);
    m_progressBar->setValue(p_val);
}

void SearchPanel::prepareLocationList()
{
    auto mainWindow = VNoteX::getInst().getMainWindow();
    mainWindow->setLocationListVisible(true);

    if (!m_locationList) {
        m_locationList = mainWindow->getLocationList();
    }

    m_locationList->clear();

    m_searchTokenOfSession.clear();

    m_locationList->startSession([this](const Location &p_location) {
                handleLocationActivated(p_location);
            });
}

void SearchPanel::handleLocationActivated(const Location &p_location)
{
    Q_ASSERT(m_searcher);

    if (!m_searchTokenOfSession) {
        if (m_option->m_objects & SearchObject::SearchContent) {
            m_searchTokenOfSession = QSharedPointer<SearchToken>::create(m_searcher->getToken());
        }
    }

    // TODO: decode the path of location and handle different types of destination.
    auto paras = QSharedPointer<FileOpenParameters>::create();
    paras->m_lineNumber = p_location.m_lineNumber;
    paras->m_searchToken = m_searchTokenOfSession;
    emit VNoteX::getInst().openFileRequested(p_location.m_path, paras);
}

void SearchPanel::focusInEvent(QFocusEvent *p_event)
{
    QFrame::focusInEvent(p_event);

    WidgetUtils::selectBaseName(m_keywordComboBox->lineEdit());
    m_keywordComboBox->setFocus();
}