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

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2020 - Raw Material Software Limited

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For this technical preview, this file is not subject to commercial licensing.

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

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

#pragma once

#include "jucer_DocumentEditorComponent.h"

//==============================================================================
class SourceCodeDocument  : public OpenDocumentManager::Document
{
public:
    SourceCodeDocument (Project*, const File&);

    bool loadedOk() const override                           { return true; }
    bool isForFile (const File& file) const override         { return getFile() == file; }
    bool isForNode (const ValueTree&) const override         { return false; }
    bool refersToProject (Project& p) const override         { return project == &p; }
    Project* getProject() const override                     { return project; }
    String getName() const override                          { return getFile().getFileName(); }
    String getType() const override                          { return getFile().getFileExtension() + " file"; }
    File getFile() const override                            { return modDetector.getFile(); }
    bool needsSaving() const override                        { return codeDoc != nullptr && codeDoc->hasChangedSinceSavePoint(); }
    bool hasFileBeenModifiedExternally() override            { return modDetector.hasBeenModified(); }
    void fileHasBeenRenamed (const File& newFile) override   { modDetector.fileHasBeenRenamed (newFile); }
    String getState() const override                         { return lastState != nullptr ? lastState->toString() : String(); }
    void restoreState (const String& state) override         { lastState.reset (new CodeEditorComponent::State (state)); }

    File getCounterpartFile() const override
    {
        auto file = getFile();

        if (file.hasFileExtension (sourceFileExtensions))
        {
            static const char* extensions[] = { "h", "hpp", "hxx", "hh", nullptr };
            return findCounterpart (file, extensions);
        }

        if (file.hasFileExtension (headerFileExtensions))
        {
            static const char* extensions[] = { "cpp", "mm", "cc", "cxx", "c", "m", nullptr };
            return findCounterpart (file, extensions);
        }

        return {};
    }

    static File findCounterpart (const File& file, const char** extensions)
    {
        while (*extensions != nullptr)
        {
            auto f = file.withFileExtension (*extensions++);

            if (f.existsAsFile())
                return f;
        }

        return {};
    }

    void reloadFromFile() override;
    bool save() override;
    bool saveAs() override;

    Component* createEditor() override;
    Component* createViewer() override       { return createEditor(); }

    void updateLastState (CodeEditorComponent&);
    void applyLastState (CodeEditorComponent&) const;

    CodeDocument& getCodeDocument();

    //==============================================================================
    struct Type  : public OpenDocumentManager::DocumentType
    {
        bool canOpenFile (const File& file) override
        {
            if (file.hasFileExtension (sourceOrHeaderFileExtensions)
                 || file.hasFileExtension ("txt;inc;tcc;xml;plist;rtf;html;htm;php;py;rb;cs"))
                return true;

            MemoryBlock mb;
            if (file.loadFileAsData (mb)
                 && seemsToBeText (static_cast<const char*> (mb.getData()), (int) mb.getSize())
                 && ! file.hasFileExtension ("svg"))
                return true;

            return false;
        }

        static bool seemsToBeText (const char* const chars, const int num) noexcept
        {
            for (int i = 0; i < num; ++i)
            {
                const char c = chars[i];
                if ((c < 32 && c != '\t' && c != '\r' && c != '\n') || chars[i] > 126)
                    return false;
            }

            return true;
        }

        Document* openFile (Project* p, const File& file) override   { return new SourceCodeDocument (p, file); }
    };

protected:
    FileModificationDetector modDetector;
    std::unique_ptr<CodeDocument> codeDoc;
    Project* project;

    std::unique_ptr<CodeEditorComponent::State> lastState;

    void reloadInternal();
};

class GenericCodeEditorComponent;

//==============================================================================
class SourceCodeEditor  : public DocumentEditorComponent,
                          private ValueTree::Listener,
                          private CodeDocument::Listener
{
public:
    SourceCodeEditor (OpenDocumentManager::Document*, CodeDocument&);
    SourceCodeEditor (OpenDocumentManager::Document*, GenericCodeEditorComponent*);
    ~SourceCodeEditor() override;

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

    std::unique_ptr<GenericCodeEditorComponent> editor;

private:
    void resized() override;
    void lookAndFeelChanged() override;

    void valueTreePropertyChanged (ValueTree&, const Identifier&) override;
    void valueTreeChildAdded (ValueTree&, ValueTree&) override;
    void valueTreeChildRemoved (ValueTree&, ValueTree&, int) override;
    void valueTreeChildOrderChanged (ValueTree&, int, int) override;
    void valueTreeParentChanged (ValueTree&) override;
    void valueTreeRedirected (ValueTree&) override;

    void codeDocumentTextInserted (const String&, int) override;
    void codeDocumentTextDeleted (int, int) override;

    void setEditor (GenericCodeEditorComponent*);
    void updateColourScheme();
    void checkSaveState();

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (SourceCodeEditor)
};


//==============================================================================
class GenericCodeEditorComponent  : public CodeEditorComponent
{
public:
    GenericCodeEditorComponent (const File&, CodeDocument&, CodeTokeniser*);
    ~GenericCodeEditorComponent() override;

    void addPopupMenuItems (PopupMenu&, const MouseEvent*) override;
    void performPopupMenuAction (int menuItemID) override;

    void getAllCommands (Array<CommandID>&) override;
    void getCommandInfo (CommandID, ApplicationCommandInfo&) override;
    bool perform (const InvocationInfo&) override;

    void showFindPanel();
    void hideFindPanel();
    void findSelection();
    void findNext (bool forwards, bool skipCurrentSelection);
    void handleEscapeKey() override;
    void editorViewportPositionChanged() override;

    void resized() override;

    static String getSearchString()                 { return getAppSettings().getGlobalProperties().getValue ("searchString"); }
    static void setSearchString (const String& s)   { getAppSettings().getGlobalProperties().setValue ("searchString", s); }
    static bool isCaseSensitiveSearch()             { return getAppSettings().getGlobalProperties().getBoolValue ("searchCaseSensitive"); }
    static void setCaseSensitiveSearch (bool b)     { getAppSettings().getGlobalProperties().setValue ("searchCaseSensitive", b); }

    struct Listener
    {
        virtual ~Listener() {}
        virtual void codeEditorViewportMoved (CodeEditorComponent&) = 0;
    };

    void addListener (Listener* listener);
    void removeListener (Listener* listener);

private:
    File file;
    class FindPanel;
    std::unique_ptr<FindPanel> findPanel;
    ListenerList<Listener> listeners;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (GenericCodeEditorComponent)
};

//==============================================================================
class CppCodeEditorComponent  : public GenericCodeEditorComponent
{
public:
    CppCodeEditorComponent (const File&, CodeDocument&);
    ~CppCodeEditorComponent() override;

    void addPopupMenuItems (PopupMenu&, const MouseEvent*) override;
    void performPopupMenuAction (int menuItemID) override;

    void handleReturnKey() override;
    void insertTextAtCaret (const String& newText) override;

private:
    void insertComponentClass();

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (CppCodeEditorComponent)
};