/*
  ==============================================================================

   This file is part of the JUCE framework.
   Copyright (c) Raw Material Software Limited

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
   copyrightable work, you agree to the terms of the JUCE End User Licence
   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

   THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
   WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.

  ==============================================================================
*/

#include "../Application/jucer_Headers.h"
#include "jucer_SourceCodeEditor.h"
#include "../Application/jucer_Application.h"

//==============================================================================
SourceCodeDocument::SourceCodeDocument (Project* p, const File& f)
    : modDetector (f), project (p)
{
}

CodeDocument& SourceCodeDocument::getCodeDocument()
{
    if (codeDoc == nullptr)
    {
        codeDoc.reset (new CodeDocument());
        reloadInternal();
        codeDoc->clearUndoHistory();
    }

    return *codeDoc;
}

std::unique_ptr<Component> SourceCodeDocument::createEditor()
{
    auto e = std::make_unique<SourceCodeEditor> (this, getCodeDocument());
    applyLastState (*(e->editor));

    JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wredundant-move")
    return std::move (e);
    JUCE_END_IGNORE_WARNINGS_GCC_LIKE
}

void SourceCodeDocument::reloadFromFile()
{
    getCodeDocument();
    reloadInternal();
}

void SourceCodeDocument::reloadInternal()
{
    jassert (codeDoc != nullptr);
    modDetector.updateHash();

    auto fileContent = getFile().loadFileAsString();

    auto lineFeed = getLineFeedForFile (fileContent);

    if (lineFeed.isEmpty())
    {
        if (project != nullptr)
            lineFeed = project->getProjectLineFeed();
        else
            lineFeed = "\r\n";
    }

    codeDoc->setNewLineCharacters (lineFeed);

    codeDoc->applyChanges (fileContent);
    codeDoc->setSavePoint();
}

static bool writeCodeDocToFile (const File& file, CodeDocument& doc)
{
    TemporaryFile temp (file);

    {
        FileOutputStream fo (temp.getFile());

        if (! (fo.openedOk() && doc.writeToStream (fo)))
            return false;
    }

    return temp.overwriteTargetFileWithTemporary();
}

bool SourceCodeDocument::saveSyncWithoutAsking()
{
    if (writeCodeDocToFile (getFile(), getCodeDocument()))
    {
        getCodeDocument().setSavePoint();
        modDetector.updateHash();
        return true;
    }

    return false;
}

void SourceCodeDocument::saveAsync (std::function<void (bool)> callback)
{
    callback (saveSyncWithoutAsking());
}

void SourceCodeDocument::saveAsAsync (std::function<void (bool)> callback)
{
    chooser = std::make_unique<FileChooser> (TRANS ("Save As..."), getFile(), "*");
    auto flags = FileBrowserComponent::saveMode
               | FileBrowserComponent::canSelectFiles
               | FileBrowserComponent::warnAboutOverwriting;

    chooser->launchAsync (flags, [this, callback] (const FileChooser& fc)
    {
        if (fc.getResult() == File{})
        {
            callback (true);
            return;
        }

        callback (writeCodeDocToFile (fc.getResult(), getCodeDocument()));
    });
}

void SourceCodeDocument::updateLastState (CodeEditorComponent& editor)
{
    lastState.reset (new CodeEditorComponent::State (editor));
}

void SourceCodeDocument::applyLastState (CodeEditorComponent& editor) const
{
    if (lastState != nullptr)
        lastState->restoreState (editor);
}

//==============================================================================
SourceCodeEditor::SourceCodeEditor (OpenDocumentManager::Document* doc, CodeDocument& codeDocument)
    : DocumentEditorComponent (doc)
{
    GenericCodeEditorComponent* ed = nullptr;
    auto file = document->getFile();

    if (fileNeedsCppSyntaxHighlighting (file))
    {
        ed = new CppCodeEditorComponent (file, codeDocument);
    }
    else
    {
        CodeTokeniser* tokeniser = nullptr;

        if (file.hasFileExtension ("xml;svg"))
        {
            static XmlTokeniser xmlTokeniser;
            tokeniser = &xmlTokeniser;
        }

        if (file.hasFileExtension ("lua"))
        {
            static LuaTokeniser luaTokeniser;
            tokeniser = &luaTokeniser;
        }

        ed = new GenericCodeEditorComponent (file, codeDocument, tokeniser);
    }

    setEditor (ed);
}

SourceCodeEditor::SourceCodeEditor (OpenDocumentManager::Document* doc, GenericCodeEditorComponent* ed)
    : DocumentEditorComponent (doc)
{
    setEditor (ed);
}

SourceCodeEditor::~SourceCodeEditor()
{
    if (editor != nullptr)
        editor->getDocument().removeListener (this);

    getAppSettings().appearance.settings.removeListener (this);

    if (auto* doc = dynamic_cast<SourceCodeDocument*> (getDocument()))
        doc->updateLastState (*editor);
}

void SourceCodeEditor::setEditor (GenericCodeEditorComponent* newEditor)
{
    if (editor != nullptr)
        editor->getDocument().removeListener (this);

    editor.reset (newEditor);
    addAndMakeVisible (newEditor);

    editor->setFont (AppearanceSettings::getDefaultCodeFont());
    editor->setTabSize (4, true);

    updateColourScheme();
    getAppSettings().appearance.settings.addListener (this);

    editor->getDocument().addListener (this);
}

void SourceCodeEditor::scrollToKeepRangeOnScreen (Range<int> range)
{
    auto space = jmin (10, editor->getNumLinesOnScreen() / 3);
    const CodeDocument::Position start (editor->getDocument(), range.getStart());
    const CodeDocument::Position end   (editor->getDocument(), range.getEnd());

    editor->scrollToKeepLinesOnScreen ({ start.getLineNumber() - space, end.getLineNumber() + space });
}

void SourceCodeEditor::highlight (Range<int> range, bool cursorAtStart)
{
    scrollToKeepRangeOnScreen (range);

    if (cursorAtStart)
    {
        editor->moveCaretTo (CodeDocument::Position (editor->getDocument(), range.getEnd()),   false);
        editor->moveCaretTo (CodeDocument::Position (editor->getDocument(), range.getStart()), true);
    }
    else
    {
        editor->setHighlightedRegion (range);
    }
}

void SourceCodeEditor::resized()
{
    editor->setBounds (getLocalBounds());
}

void SourceCodeEditor::updateColourScheme()
{
    getAppSettings().appearance.applyToCodeEditor (*editor);
}

void SourceCodeEditor::checkSaveState()
{
    setEditedState (getDocument()->needsSaving());
}

void SourceCodeEditor::lookAndFeelChanged()
{
    updateColourScheme();
}

void SourceCodeEditor::valueTreePropertyChanged (ValueTree&, const Identifier&)   { updateColourScheme(); }
void SourceCodeEditor::valueTreeChildAdded (ValueTree&, ValueTree&)               { updateColourScheme(); }
void SourceCodeEditor::valueTreeChildRemoved (ValueTree&, ValueTree&, int)        { updateColourScheme(); }
void SourceCodeEditor::valueTreeChildOrderChanged (ValueTree&, int, int)          { updateColourScheme(); }
void SourceCodeEditor::valueTreeParentChanged (ValueTree&)                        { updateColourScheme(); }
void SourceCodeEditor::valueTreeRedirected (ValueTree&)                           { updateColourScheme(); }

void SourceCodeEditor::codeDocumentTextInserted (const String&, int)              { checkSaveState(); }
void SourceCodeEditor::codeDocumentTextDeleted (int, int)                         { checkSaveState(); }

class GenericCodeEditorComponent::FindPanel final : public Component
{
public:
    FindPanel()
    {
        editor.setColour (CaretComponent::caretColourId, Colours::black);

        addAndMakeVisible (editor);
        label.setColour (Label::textColourId, Colours::white);
        label.attachToComponent (&editor, false);

        addAndMakeVisible (caseButton);
        caseButton.setColour (ToggleButton::textColourId, Colours::white);
        caseButton.setToggleState (isCaseSensitiveSearch(), dontSendNotification);
        caseButton.onClick = [this] { setCaseSensitiveSearch (caseButton.getToggleState()); };

        findPrev.setConnectedEdges (Button::ConnectedOnRight);
        findNext.setConnectedEdges (Button::ConnectedOnLeft);
        addAndMakeVisible (findPrev);
        addAndMakeVisible (findNext);

        setWantsKeyboardFocus (false);
        setFocusContainerType (FocusContainerType::keyboardFocusContainer);
        findPrev.setWantsKeyboardFocus (false);
        findNext.setWantsKeyboardFocus (false);

        editor.setText (getSearchString());
        editor.onTextChange = [this] { changeSearchString(); };
        editor.onReturnKey  = [] { ProjucerApplication::getCommandManager().invokeDirectly (CommandIDs::findNext, true); };
        editor.onEscapeKey  = [this]
        {
            if (auto* ed = getOwner())
                ed->hideFindPanel();
        };
    }

    void setCommandManager (ApplicationCommandManager* cm)
    {
        findPrev.setCommandToTrigger (cm, CommandIDs::findPrevious, true);
        findNext.setCommandToTrigger (cm, CommandIDs::findNext, true);
    }

    void paint (Graphics& g) override
    {
        Path outline;
        outline.addRoundedRectangle (1.0f, 1.0f, (float) getWidth() - 2.0f, (float) getHeight() - 2.0f, 8.0f);

        g.setColour (Colours::black.withAlpha (0.6f));
        g.fillPath (outline);
        g.setColour (Colours::white.withAlpha (0.8f));
        g.strokePath (outline, PathStrokeType (1.0f));
    }

    void resized() override
    {
        int y = 30;
        editor.setBounds (10, y, getWidth() - 20, 24);
        y += 30;
        caseButton.setBounds (10, y, getWidth() / 2 - 10, 22);
        findNext.setBounds (getWidth() - 40, y, 30, 22);
        findPrev.setBounds (getWidth() - 70, y, 30, 22);
    }

    void changeSearchString()
    {
        setSearchString (editor.getText());

        if (auto* ed = getOwner())
            ed->findNext (true, false);
    }

    GenericCodeEditorComponent* getOwner() const
    {
        return findParentComponentOfClass <GenericCodeEditorComponent>();
    }

    TextEditor editor;
    Label label  { {}, "Find:" };
    ToggleButton caseButton  { "Case-sensitive" };
    TextButton findPrev  { "<" },
               findNext  { ">" };
};

//==============================================================================
GenericCodeEditorComponent::GenericCodeEditorComponent (const File& f, CodeDocument& codeDocument,
                                                        CodeTokeniser* tokeniser)
   : CodeEditorComponent (codeDocument, tokeniser), file (f)
{
    setScrollbarThickness (6);
    setCommandManager (&ProjucerApplication::getCommandManager());
}

GenericCodeEditorComponent::~GenericCodeEditorComponent() {}

enum
{
    showInFinderID = 0x2fe821e3,
    insertComponentID = 0x2fe821e4
};

void GenericCodeEditorComponent::addPopupMenuItems (PopupMenu& menu, const MouseEvent* e)
{
    menu.addItem (showInFinderID,
                 #if JUCE_MAC
                  "Reveal " + file.getFileName() + " in Finder");
                 #else
                  "Reveal " + file.getFileName() + " in Explorer");
                 #endif
    menu.addSeparator();

    CodeEditorComponent::addPopupMenuItems (menu, e);
}

void GenericCodeEditorComponent::performPopupMenuAction (int menuItemID)
{
    if (menuItemID == showInFinderID)
        file.revealToUser();
    else
        CodeEditorComponent::performPopupMenuAction (menuItemID);
}

void GenericCodeEditorComponent::getAllCommands (Array <CommandID>& commands)
{
    CodeEditorComponent::getAllCommands (commands);

    const CommandID ids[] = { CommandIDs::showFindPanel,
                              CommandIDs::findSelection,
                              CommandIDs::findNext,
                              CommandIDs::findPrevious };

    commands.addArray (ids, numElementsInArray (ids));
}

void GenericCodeEditorComponent::getCommandInfo (const CommandID commandID, ApplicationCommandInfo& result)
{
    auto anythingSelected = isHighlightActive();

    switch (commandID)
    {
        case CommandIDs::showFindPanel:
            result.setInfo (TRANS ("Find"), TRANS ("Searches for text in the current document."), "Editing", 0);
            result.defaultKeypresses.add (KeyPress ('f', ModifierKeys::commandModifier, 0));
            break;

        case CommandIDs::findSelection:
            result.setInfo (TRANS ("Find Selection"), TRANS ("Searches for the currently selected text."), "Editing", 0);
            result.setActive (anythingSelected);
            result.defaultKeypresses.add (KeyPress ('l', ModifierKeys::commandModifier, 0));
            break;

        case CommandIDs::findNext:
            result.setInfo (TRANS ("Find Next"), TRANS ("Searches for the next occurrence of the current search-term."), "Editing", 0);
            result.defaultKeypresses.add (KeyPress ('g', ModifierKeys::commandModifier, 0));
            break;

        case CommandIDs::findPrevious:
            result.setInfo (TRANS ("Find Previous"), TRANS ("Searches for the previous occurrence of the current search-term."), "Editing", 0);
            result.defaultKeypresses.add (KeyPress ('g', ModifierKeys::commandModifier | ModifierKeys::shiftModifier, 0));
            result.defaultKeypresses.add (KeyPress ('d', ModifierKeys::commandModifier, 0));
            break;

        default:
            CodeEditorComponent::getCommandInfo (commandID, result);
            break;
    }
}

bool GenericCodeEditorComponent::perform (const InvocationInfo& info)
{
    switch (info.commandID)
    {
        case CommandIDs::showFindPanel:     showFindPanel();         return true;
        case CommandIDs::findSelection:     findSelection();         return true;
        case CommandIDs::findNext:          findNext (true, true);   return true;
        case CommandIDs::findPrevious:      findNext (false, false); return true;
        default:                            break;
    }

    return CodeEditorComponent::perform (info);
}

void GenericCodeEditorComponent::addListener (GenericCodeEditorComponent::Listener* listener)
{
    listeners.add (listener);
}

void GenericCodeEditorComponent::removeListener (GenericCodeEditorComponent::Listener* listener)
{
    listeners.remove (listener);
}

//==============================================================================
void GenericCodeEditorComponent::resized()
{
    CodeEditorComponent::resized();

    if (findPanel != nullptr)
    {
        findPanel->setSize (jmin (260, getWidth() - 32), 100);
        findPanel->setTopRightPosition (getWidth() - 16, 8);
    }
}

void GenericCodeEditorComponent::showFindPanel()
{
    if (findPanel == nullptr)
    {
        findPanel.reset (new FindPanel());
        findPanel->setCommandManager (&ProjucerApplication::getCommandManager());
        addAndMakeVisible (findPanel.get());
        resized();
    }

    if (findPanel != nullptr)
    {
        findPanel->editor.grabKeyboardFocus();
        findPanel->editor.selectAll();
    }
}

void GenericCodeEditorComponent::hideFindPanel()
{
    findPanel.reset();
}

void GenericCodeEditorComponent::findSelection()
{
    auto selected = getTextInRange (getHighlightedRegion());

    if (selected.isNotEmpty())
    {
        setSearchString (selected);
        findNext (true, true);
    }
}

void GenericCodeEditorComponent::findNext (bool forwards, bool skipCurrentSelection)
{
    auto highlight = getHighlightedRegion();
    const CodeDocument::Position startPos (getDocument(), skipCurrentSelection ? highlight.getEnd()
                                                                               : highlight.getStart());
    auto lineNum = startPos.getLineNumber();
    auto linePos = startPos.getIndexInLine();

    auto totalLines = getDocument().getNumLines();
    auto searchText = getSearchString();
    auto caseSensitive = isCaseSensitiveSearch();

    for (auto linesToSearch = totalLines; --linesToSearch >= 0;)
    {
        auto line = getDocument().getLine (lineNum);
        int index;

        if (forwards)
        {
            index = caseSensitive ? line.indexOf (linePos, searchText)
                                  : line.indexOfIgnoreCase (linePos, searchText);
        }
        else
        {
            if (linePos >= 0)
                line = line.substring (0, linePos);

            index = caseSensitive ? line.lastIndexOf (searchText)
                                  : line.lastIndexOfIgnoreCase (searchText);
        }

        if (index >= 0)
        {
            const CodeDocument::Position p (getDocument(), lineNum, index);
            selectRegion (p, p.movedBy (searchText.length()));
            break;
        }

        if (forwards)
        {
            linePos = 0;
            lineNum = (lineNum + 1) % totalLines;
        }
        else
        {
            if (--lineNum < 0)
                lineNum = totalLines - 1;

            linePos = -1;
        }
    }
}

void GenericCodeEditorComponent::handleEscapeKey()
{
    CodeEditorComponent::handleEscapeKey();
    hideFindPanel();
}

void GenericCodeEditorComponent::editorViewportPositionChanged()
{
    CodeEditorComponent::editorViewportPositionChanged();
    listeners.call ([this] (Listener& l) { l.codeEditorViewportMoved (*this); });
}

//==============================================================================
static CPlusPlusCodeTokeniser cppTokeniser;

CppCodeEditorComponent::CppCodeEditorComponent (const File& f, CodeDocument& doc)
    : GenericCodeEditorComponent (f, doc, &cppTokeniser)
{
}

CppCodeEditorComponent::~CppCodeEditorComponent() {}

void CppCodeEditorComponent::handleReturnKey()
{
    GenericCodeEditorComponent::handleReturnKey();

    auto pos = getCaretPos();

    String blockIndent, lastLineIndent;
    CodeHelpers::getIndentForCurrentBlock (pos, getTabString (getTabSize()), blockIndent, lastLineIndent);

    auto remainderOfBrokenLine = pos.getLineText();
    auto numLeadingWSChars = CodeHelpers::getLeadingWhitespace (remainderOfBrokenLine).length();

    if (numLeadingWSChars > 0)
        getDocument().deleteSection (pos, pos.movedBy (numLeadingWSChars));

    if (remainderOfBrokenLine.trimStart().startsWithChar ('}'))
        insertTextAtCaret (blockIndent);
    else
        insertTextAtCaret (lastLineIndent);

    auto previousLine = pos.movedByLines (-1).getLineText();
    auto trimmedPreviousLine = previousLine.trim();

    if ((trimmedPreviousLine.startsWith ("if ")
          || trimmedPreviousLine.startsWith ("if(")
          || trimmedPreviousLine.startsWith ("for ")
          || trimmedPreviousLine.startsWith ("for(")
          || trimmedPreviousLine.startsWith ("while(")
          || trimmedPreviousLine.startsWith ("while "))
         && trimmedPreviousLine.endsWithChar (')'))
    {
        insertTabAtCaret();
    }
}

void CppCodeEditorComponent::insertTextAtCaret (const String& newText)
{
    if (getHighlightedRegion().isEmpty())
    {
        auto pos = getCaretPos();

        if ((newText == "{" || newText == "}")
             && pos.getLineNumber() > 0
             && pos.getLineText().trim().isEmpty())
        {
            moveCaretToStartOfLine (true);

            String blockIndent, lastLineIndent;
            if (CodeHelpers::getIndentForCurrentBlock (pos, getTabString (getTabSize()), blockIndent, lastLineIndent))
            {
                GenericCodeEditorComponent::insertTextAtCaret (blockIndent);

                if (newText == "{")
                    insertTabAtCaret();
            }
        }
    }

    GenericCodeEditorComponent::insertTextAtCaret (newText);
}

void CppCodeEditorComponent::addPopupMenuItems (PopupMenu& menu, const MouseEvent* e)
{
    GenericCodeEditorComponent::addPopupMenuItems (menu, e);

    menu.addSeparator();
    menu.addItem (insertComponentID, TRANS ("Insert code for a new Component class..."));
}

void CppCodeEditorComponent::performPopupMenuAction (int menuItemID)
{
    if (menuItemID == insertComponentID)
        insertComponentClass();

    GenericCodeEditorComponent::performPopupMenuAction (menuItemID);
}

void CppCodeEditorComponent::insertComponentClass()
{
    asyncAlertWindow = std::make_unique<AlertWindow> (TRANS ("Insert a new Component class"),
                                                      TRANS ("Please enter a name for the new class"),
                                                      MessageBoxIconType::NoIcon,
                                                      nullptr);

    const String classNameField { "Class Name" };

    asyncAlertWindow->addTextEditor (classNameField, String(), String(), false);
    asyncAlertWindow->addButton (TRANS ("Insert Code"),  1, KeyPress (KeyPress::returnKey));
    asyncAlertWindow->addButton (TRANS ("Cancel"),       0, KeyPress (KeyPress::escapeKey));

    asyncAlertWindow->enterModalState (true,
                                       ModalCallbackFunction::create ([parent = SafePointer<CppCodeEditorComponent> { this }, classNameField] (int result)
    {
        if (parent == nullptr)
            return;

        auto& aw = *(parent->asyncAlertWindow);

        aw.exitModalState (result);
        aw.setVisible (false);

        if (result == 0)
            return;

        auto className = aw.getTextEditorContents (classNameField).trim();

        if (className == build_tools::makeValidIdentifier (className, false, true, false))
        {
            String code (BinaryData::jucer_InlineComponentTemplate_h);
            code = code.replace ("%%component_class%%", className);

            parent->insertTextAtCaret (code);
            return;
        }

        parent->insertComponentClass();
    }));
}