// Copyright (C) 2019 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0

#include "clangformatindenter.h"
#include "clangformatsettings.h"
#include "clangformatutils.h"

#include <coreplugin/icore.h>

#include <cppeditor/cppqtstyleindenter.h>
#include <cppeditor/cpptoolssettings.h>

#include <extensionsystem/pluginmanager.h>

#include <utils/genericconstants.h>
#include <utils/qtcsettings.h>

#include <projectexplorer/projectmanager.h>

#include <texteditor/tabsettings.h>
#include <texteditor/textdocumentlayout.h>

using namespace clang;
using namespace format;
using namespace TextEditor;
using namespace Utils;

namespace ClangFormat {

static bool isBeautifierPluginActivated()
{
    return ExtensionSystem::PluginManager::specExistsAndIsEnabled("beautifier");
}

static bool isBeautifierOnSaveActivated()
{
    if (!isBeautifierPluginActivated())
        return false;

    QtcSettings *s = Core::ICore::settings();
    bool activated = false;
    s->beginGroup(Utils::Constants::BEAUTIFIER_SETTINGS_GROUP);
    s->beginGroup(Utils::Constants::BEAUTIFIER_GENERAL_GROUP);
    if (s->value(Utils::Constants::BEAUTIFIER_AUTO_FORMAT_ON_SAVE, false).toBool())
        activated = true;
    s->endGroup();
    s->endGroup();
    return activated;
}

ClangFormatIndenter::ClangFormatIndenter(QTextDocument *doc)
    : ClangFormatBaseIndenter(doc)
{}

bool ClangFormatIndenter::formatCodeInsteadOfIndent() const
{
#ifdef WITH_TESTS
    if (CppEditor::cppCodeStyle()->codeStyleSettings().forceFormatting)
        return true;
#endif
    return getCurrentIndentationOrFormattingSettings(m_fileName)
           == ClangFormatSettings::Mode::Formatting;
}

std::optional<TabSettingsData> ClangFormatIndenter::tabSettings() const
{
    // FIXME: Why don't we have a valid file path from the beginning?
    if (m_fileName.isEmpty())
        return {};

    FormatStyle style = styleForFile();
    TabSettingsData tabSettings;

    switch (style.UseTab) {
    case FormatStyle::UT_Never:
        tabSettings.m_tabPolicy = TabSettingsData::SpacesOnlyTabPolicy;
        break;
    default:
        tabSettings.m_tabPolicy = TabSettingsData::TabsOnlyTabPolicy;
    }

    tabSettings.m_tabSize = static_cast<int>(style.TabWidth);
    tabSettings.m_indentSize = static_cast<int>(style.IndentWidth);

    const auto alignAfterOpenBracket = [](const FormatStyle &style) {
#if LLVM_VERSION_MAJOR >= 22
        return style.AlignAfterOpenBracket;
#else
        return style.AlignAfterOpenBracket == FormatStyle::BAS_Align;
#endif
    };

    if (alignAfterOpenBracket(style))
        tabSettings.m_continuationAlignBehavior = TabSettingsData::ContinuationAlignWithIndent;
    else
        tabSettings.m_continuationAlignBehavior = TabSettingsData::NoContinuationAlign;

    return tabSettings;
}

int ClangFormatIndenter::lastSaveRevision() const
{
    auto *layout = qobject_cast<TextEditor::TextDocumentLayout *>(m_doc->documentLayout());
    if (!layout)
        return 0;
    return layout->lastSaveRevision;
}

bool ClangFormatIndenter::formatOnSave() const
{
    return ClangFormatSettings::instance().formatOnSave() && !isBeautifierOnSaveActivated()
           && formatCodeInsteadOfIndent();
}

bool ClangFormatIndenter::formatWhileTyping() const
{
    return ClangFormatSettings::instance().formatWhileTyping() && formatCodeInsteadOfIndent();
}

// ClangFormatIndenterWrapper

ClangFormatForwardingIndenter::ClangFormatForwardingIndenter(QTextDocument *doc)
    : TextEditor::Indenter(doc)
    , m_clangFormatIndenter(std::make_unique<ClangFormatIndenter>(doc))
    , m_cppIndenter(CppEditor::createCppQtStyleIndenter(doc))
{}

ClangFormatForwardingIndenter::~ClangFormatForwardingIndenter() = default;

void ClangFormatForwardingIndenter::setFileName(const Utils::FilePath &fileName)
{
    m_fileName = fileName;
    m_clangFormatIndenter->setFileName(fileName);
    m_cppIndenter->setFileName(fileName);
    m_fileSize.reset();
}

TextEditor::Indenter *ClangFormatForwardingIndenter::currentIndenter() const
{
    ClangFormatSettings::Mode mode = getCurrentIndentationOrFormattingSettings(m_fileName);

    if (mode == ClangFormatSettings::Disable)
        return m_cppIndenter.get();
    if (!m_fileSize)
        m_fileSize = m_fileName.fileSize();
    if (*m_fileSize >= ClangFormatSettings::instance().fileSizeThreshold() * 1024)
        return m_cppIndenter.get();

    return m_clangFormatIndenter.get();
}

bool ClangFormatForwardingIndenter::isElectricCharacter(const QChar &ch) const
{
    return currentIndenter()->isElectricCharacter(ch);
}

void ClangFormatForwardingIndenter::setCodeStylePreferences(
    TextEditor::ICodeStylePreferences *preferences)
{
    currentIndenter()->setCodeStylePreferences(preferences);
}

void ClangFormatForwardingIndenter::invalidateCache()
{
    currentIndenter()->invalidateCache();
}

int ClangFormatForwardingIndenter::indentFor(const QTextBlock &block,
                                          const TextEditor::TabSettingsData &tabSettings,
                                          int cursorPositionInEditor)
{
    return currentIndenter()->indentFor(block, tabSettings, cursorPositionInEditor);
}

void ClangFormatForwardingIndenter::autoIndent(const QTextCursor &cursor,
                                            const TextEditor::TabSettingsData &tabSettings,
                                            int cursorPositionInEditor)
{
    currentIndenter()->autoIndent(cursor, tabSettings, cursorPositionInEditor);
}

Utils::EditOperations ClangFormatForwardingIndenter::format(
    const TextEditor::RangesInLines &rangesInLines, FormattingMode mode)
{
    return currentIndenter()->format(rangesInLines, mode);
}


bool ClangFormatForwardingIndenter::formatOnSave() const
{
    return currentIndenter()->formatOnSave();
}

TextEditor::IndentationForBlock ClangFormatForwardingIndenter::indentationForBlocks(
    const QList<QTextBlock> &blocks,
    const TextEditor::TabSettingsData &tabSettings,
    int cursorPositionInEditor)
{
    return currentIndenter()->indentationForBlocks(blocks, tabSettings, cursorPositionInEditor);
}

std::optional<TextEditor::TabSettingsData> ClangFormatForwardingIndenter::tabSettings() const
{
    return currentIndenter()->tabSettings();
}

void ClangFormatForwardingIndenter::indentBlock(const QTextBlock &block,
                                             const QChar &typedChar,
                                             const TextEditor::TabSettingsData &tabSettings,
                                             int cursorPositionInEditor)
{
    currentIndenter()->indentBlock(block, typedChar, tabSettings, cursorPositionInEditor);
}

void ClangFormatForwardingIndenter::indent(const QTextCursor &cursor,
                                        const QChar &typedChar,
                                        const TextEditor::TabSettingsData &tabSettings,
                                        int cursorPositionInEditor)
{
    currentIndenter()->indent(cursor, typedChar, tabSettings, cursorPositionInEditor);
}

void ClangFormatForwardingIndenter::reindent(const QTextCursor &cursor,
                                          const TextEditor::TabSettingsData &tabSettings,
                                          int cursorPositionInEditor)
{
    currentIndenter()->reindent(cursor, tabSettings, cursorPositionInEditor);
}

std::optional<int> ClangFormatForwardingIndenter::margin() const
{
    return currentIndenter()->margin();
}

bool ClangFormatForwardingIndenter::respectsTabSettings() const
{
    return currentIndenter()->respectsTabSettings();
}

} // namespace ClangFormat
