/*
 * DISTRHO Plugin Framework (DPF)
 * Copyright (C) 2012-2021 Filipe Coelho <falktx@falktx.com>
 *
 * Permission to use, copy, modify, and/or distribute this software for any purpose with
 * or without fee is hereby granted, provided that the above copyright notice and this
 * permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
 * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "tests.hpp"

#include "widgets/ExampleColorWidget.hpp"
#include "widgets/ExampleImagesWidget.hpp"
#include "widgets/ExampleRectanglesWidget.hpp"
#include "widgets/ExampleShapesWidget.hpp"
#ifdef DGL_OPENGL
#include "widgets/ExampleTextWidget.hpp"
#endif

#include "demo_res/DemoArtwork.cpp"
#include "images_res/CatPics.cpp"

#ifdef DGL_CAIRO
#include "../dgl/Cairo.hpp"
typedef DGL_NAMESPACE::CairoImage DemoImage;
#endif
#ifdef DGL_OPENGL
#include "../dgl/OpenGL.hpp"
typedef DGL_NAMESPACE::OpenGLImage DemoImage;
#endif
#ifdef DGL_VULKAN
#include "../dgl/Vulkan.hpp"
typedef DGL_NAMESPACE::VulkanImage DemoImage;
#endif

START_NAMESPACE_DGL

// Partial specialization is not allowed in C++, so we need to define these here
template<> inline
ExampleImagesWidget<SubWidget, DemoImage>::ExampleImagesWidget(Widget* const parentWidget)
: SubWidget(parentWidget) { init(parentWidget->getApp()); }

template<> inline
ExampleImagesWidget<TopLevelWidget, DemoImage>::ExampleImagesWidget(Window& windowToMapTo)
: TopLevelWidget(windowToMapTo) { init(windowToMapTo.getApp()); }

template<>
ExampleImagesWidget<StandaloneWindow, DemoImage>::ExampleImagesWidget(Application& app)
: StandaloneWindow(app) { init(app); done(); }

typedef ExampleImagesWidget<SubWidget, DemoImage> ExampleImagesSubWidget;
typedef ExampleImagesWidget<TopLevelWidget, DemoImage> ExampleImagesTopLevelWidget;
typedef ExampleImagesWidget<StandaloneWindow, DemoImage> ExampleImagesStandaloneWindow;

// --------------------------------------------------------------------------------------------------------------------
// Left side tab-like widget

class LeftSideWidget : public SubWidget
{
public:
#ifdef DGL_OPENGL
    static const int kPageCount = 5;
#else
    static const int kPageCount = 4;
#endif

    class Callback
    {
    public:
        virtual ~Callback() {}
        virtual void curPageChanged(int curPage) = 0;
    };

    LeftSideWidget(Widget* parent, Callback* const cb)
        : SubWidget(parent),
          callback(cb),
          curPage(0),
          curHover(-1)
    {

        using namespace DemoArtwork;
        img1.loadFromMemory(ico1Data, ico1Width, ico1Height, kImageFormatBGR);
        img2.loadFromMemory(ico2Data, ico2Width, ico2Height, kImageFormatBGR);
        img3.loadFromMemory(ico3Data, ico3Width, ico2Height, kImageFormatBGR);
        img4.loadFromMemory(ico4Data, ico4Width, ico4Height, kImageFormatBGR);

#ifdef DGL_OPENGL
        img5.loadFromMemory(ico5Data, ico5Width, ico5Height, kImageFormatBGR);

        // for text
        nvg.loadSharedResources();
#endif
    }

protected:
    void onDisplay() override
    {
        const GraphicsContext& context(getGraphicsContext());
        const int iconSize = bgIcon.getWidth();

        Color(0.027f, 0.027f, 0.027f).setFor(context);
        Rectangle<uint>(0, 0, getSize()).draw(context);

        bgIcon.setY(curPage*iconSize + curPage*3);

        Color(0.129f, 0.129f, 0.129f).setFor(context);
        bgIcon.draw(context);

        Color(0.184f, 0.184f, 0.184f).setFor(context);
        bgIcon.drawOutline(context);

        if (curHover != curPage && curHover != -1)
        {
            Rectangle<int> rHover(1, curHover*iconSize + curHover*3, iconSize-2, iconSize-2);

            Color(0.071f, 0.071f, 0.071f).setFor(context);
            rHover.draw(context);

            Color(0.102f, 0.102f, 0.102f).setFor(context);
            rHover.drawOutline(context);
        }

        Color(0.184f, 0.184f, 0.184f).setFor(context);
        lineSep.draw(context);

        // reset color
        Color(1.0f, 1.0f, 1.0f, 1.0f).setFor(context, true);

        const int pad = iconSize/2 - DemoArtwork::ico1Width/2;

        img1.drawAt(context, pad, pad);
        img2.drawAt(context, pad, pad + 3 + iconSize);
        img3.drawAt(context, pad, pad + 6 + iconSize*2);
        img4.drawAt(context, pad, pad + 9 + iconSize*3);

#ifdef DGL_OPENGL
        img5.drawAt(context, pad, pad + 12 + iconSize*4);

        // draw some text
        nvg.beginFrame(this);

        nvg.fontSize(23.0f);
        nvg.textAlign(NanoVG::ALIGN_LEFT|NanoVG::ALIGN_TOP);
        //nvg.textLineHeight(20.0f);

        nvg.fillColor(220,220,220,220);
        nvg.textBox(10, 420, iconSize, "Haha,", nullptr);
        nvg.textBox(15, 440, iconSize, "Look!", nullptr);

        nvg.endFrame();
#endif
    }

    bool onMouse(const MouseEvent& ev) override
    {
        if (ev.button != 1 || ! ev.press)
            return false;
        if (! contains(ev.pos))
            return false;

        const int iconSize = bgIcon.getWidth();

        for (int i=0; i<kPageCount; ++i)
        {
            bgIcon.setY(i*iconSize + i*3);

            if (bgIcon.contains(ev.pos))
            {
                curPage = i;
                callback->curPageChanged(i);
                repaint();
                break;
            }
        }

        return true;
    }

    bool onMotion(const MotionEvent& ev) override
    {
        if (contains(ev.pos))
        {
            const int iconSize = bgIcon.getWidth();

            for (int i=0; i<kPageCount; ++i)
            {
                bgIcon.setY(i*iconSize + i*3);

                if (bgIcon.contains(ev.pos))
                {
                    if (curHover == i)
                        return true;

                    curHover = i;
                    repaint();
                    return true;
                }
            }

            if (curHover == -1)
                return true;

            curHover = -1;
            repaint();
            return true;
        }
        else
        {
            if (curHover == -1)
                return false;

            curHover = -1;
            repaint();
            return true;
        }
    }

    void onResize(const ResizeEvent& ev) override
    {
        const uint width  = ev.size.getWidth();
        const uint height = ev.size.getHeight();

        bgIcon.setWidth(width-4);
        bgIcon.setHeight(width-4);

        lineSep.setStartPos(width, 0);
        lineSep.setEndPos(width, height);
    }

private:
    Callback* const callback;
    int curPage, curHover;
    Rectangle<double> bgIcon;
    Line<int> lineSep;
    DemoImage img1, img2, img3, img4, img5;

#ifdef DGL_OPENGL
    // for text
    NanoVG nvg;
#endif
};

// --------------------------------------------------------------------------------------------------------------------
// Resize handle widget

class ResizeHandle : public TopLevelWidget
{
    Rectangle<uint> area;
    Line<double> l1, l2, l3;
    uint baseSize;

    // event handling state
    bool resizing;
    Point<double> lastResizePoint;
    Size<double> resizingSize;

public:
    explicit ResizeHandle(TopLevelWidget* const tlw)
        : TopLevelWidget(tlw->getWindow()),
          baseSize(16),
          resizing(false)
    {
        resetArea();
    }

    explicit ResizeHandle(Window& window)
        : TopLevelWidget(window),
          baseSize(16),
          resizing(false)
    {
        resetArea();
    }

    void setBaseSize(const uint size)
    {
        baseSize = std::max(16u, size);
        resetArea();
    }

protected:
    void onDisplay() override
    {
        const GraphicsContext& context(getGraphicsContext());
        const double offset = getScaleFactor();

        // draw white lines, 1px wide
        Color(1.0f, 1.0f, 1.0f).setFor(context);
        l1.draw(context, 1);
        l2.draw(context, 1);
        l3.draw(context, 1);

        // draw black lines, offset by 1px and 2px wide
        Color(0.0f, 0.0f, 0.0f).setFor(context);
        Line<double> l1b(l1), l2b(l2), l3b(l3);
        l1b.moveBy(offset, offset);
        l2b.moveBy(offset, offset);
        l3b.moveBy(offset, offset);
        l1b.draw(context, 1);
        l2b.draw(context, 1);
        l3b.draw(context, 1);
    }

    bool onMouse(const MouseEvent& ev) override
    {
        if (ev.button != 1)
            return false;

        if (ev.press && area.contains(ev.pos))
        {
            resizing = true;
            resizingSize = Size<double>(getWidth(), getHeight());
            lastResizePoint = ev.pos;
            return true;
        }

        if (resizing && ! ev.press)
        {
            resizing = false;
            return true;
        }

        return false;
    }

    bool onMotion(const MotionEvent& ev) override
    {
        if (! resizing)
            return false;

        const Size<double> offset(ev.pos.getX() - lastResizePoint.getX(),
                                  ev.pos.getY() - lastResizePoint.getY());

        resizingSize += offset;
        lastResizePoint = ev.pos;

        // TODO min width, min height
        const uint minWidth = 16;
        const uint minHeight = 16;

        if (resizingSize.getWidth() < minWidth)
            resizingSize.setWidth(minWidth);
        if (resizingSize.getHeight() < minHeight)
            resizingSize.setHeight(minHeight);

        setSize(resizingSize.getWidth(), resizingSize.getHeight());
        return true;
    }

    void onResize(const ResizeEvent& ev) override
    {
        TopLevelWidget::onResize(ev);
        resetArea();
    }

private:
    void resetArea()
    {
        const double scaleFactor = getScaleFactor();
        const uint margin = 0.0 * scaleFactor;
        const uint size = baseSize * scaleFactor;

        area = Rectangle<uint>(getWidth() - size - margin,
                               getHeight() - size - margin,
                               size, size);

        recreateLines(area.getX(), area.getY(), size);
    }

    void recreateLines(const uint x, const uint y, const uint size)
    {
        uint linesize = size;
        uint offset = 0;

        // 1st line, full diagonal size
        l1.setStartPos(x + size, y);
        l1.setEndPos(x, y + size);

        // 2nd line, bit more to the right and down, cropped
        offset += size / 3;
        linesize -= size / 3;
        l2.setStartPos(x + linesize + offset, y + offset);
        l2.setEndPos(x + offset, y + linesize + offset);

        // 3rd line, even more right and down
        offset += size / 3;
        linesize -= size / 3;
        l3.setStartPos(x + linesize + offset, y + offset);
        l3.setEndPos(x + offset, y + linesize + offset);
    }
};

// --------------------------------------------------------------------------------------------------------------------
// Main Demo Window, having a left-side tab-like widget and main area for current widget

class DemoWindow : public StandaloneWindow,
                   public LeftSideWidget::Callback
{
    static const int kSidebarWidth = 81;

public:
#ifdef DGL_CAIRO
    static constexpr const char* const kExampleWidgetName = "Demo - Cairo";
#endif
#ifdef DGL_OPENGL
    static constexpr const char* const kExampleWidgetName = "Demo - OpenGL";
#endif
#ifdef DGL_VULKAN
    static constexpr const char* const kExampleWidgetName = "Demo - Vulkan";
#endif

    DemoWindow(Application& app)
        : StandaloneWindow(app),
          curWidget(nullptr)
    {
        const ScopedGraphicsContext sgc(*this);

        wColor = new ExampleColorSubWidget(this);
        wColor->hide();
        wColor->setAbsoluteX(kSidebarWidth);

        wImages = new ExampleImagesSubWidget(this);
        wImages->hide();
        wImages->setAbsoluteX(kSidebarWidth);

        wRects = new ExampleRectanglesSubWidget(this);
        wRects->hide();
        wRects->setAbsoluteX(kSidebarWidth);

        wShapes = new ExampleShapesSubWidget(this);
        wShapes->hide();
        wShapes->setAbsoluteX(kSidebarWidth);

#ifdef DGL_OPENGL
        wText = new ExampleTextSubWidget(this),
        wText->hide();
        wText->setAbsoluteX(kSidebarWidth);
#endif
        wLeft = new LeftSideWidget(this, this),
        wLeft->setAbsolutePos(2, 2);

        resizer = new ResizeHandle(this);

        curPageChanged(0);
        done();
    }

protected:
    void curPageChanged(int curPage) override
    {
        if (curWidget != nullptr)
            curWidget->hide();

        switch (curPage)
        {
        case 0:
            curWidget = wColor;
            break;
        case 1:
            curWidget = wImages;
            break;
        case 2:
            curWidget = wRects;
            break;
        case 3:
            curWidget = wShapes;
            break;
#ifdef DGL_OPENGL
        case 4:
            curWidget = wText;
            break;
#endif
        default:
            curWidget = nullptr;
            break;
        }

        if (curWidget != nullptr)
            curWidget->show();
    }

    void onDisplay() override
    {
    }

    void onReshape(uint width, uint height) override
    {
        StandaloneWindow::onReshape(width, height);

        if (width < kSidebarWidth)
            return;

        Size<uint> size(width-kSidebarWidth, height);
        wColor->setSize(size);
        wImages->setSize(size);
        wRects->setSize(size);
        wShapes->setSize(size);
#ifdef DGL_OPENGL
        wText->setSize(size);
#endif
        wLeft->setSize(kSidebarWidth-4, height-4);
    }

private:
    ScopedPointer<ExampleColorSubWidget> wColor;
    ScopedPointer<ExampleImagesSubWidget> wImages;
    ScopedPointer<ExampleRectanglesSubWidget> wRects;
    ScopedPointer<ExampleShapesSubWidget> wShapes;
#ifdef DGL_OPENGL
    ScopedPointer<ExampleTextSubWidget> wText;
#endif
    ScopedPointer<LeftSideWidget> wLeft;
    ScopedPointer<ResizeHandle> resizer;

    Widget* curWidget;
};

// --------------------------------------------------------------------------------------------------------------------
// Special handy function that runs a StandaloneWindow inside the function scope

template <class ExampleWidgetStandaloneWindow>
void createAndShowExampleWidgetStandaloneWindow(Application& app)
{
    ExampleWidgetStandaloneWindow swin(app);
    swin.setResizable(true);
    swin.setSize(600, 500);
    swin.setTitle(ExampleWidgetStandaloneWindow::kExampleWidgetName);
    swin.show();
    app.exec();
}

// --------------------------------------------------------------------------------------------------------------------

END_NAMESPACE_DGL

int main(int argc, char* argv[])
{
    USE_NAMESPACE_DGL;
    using DGL_NAMESPACE::Window;

    Application app;

    if (argc > 1)
    {
        /**/ if (std::strcmp(argv[1], "color") == 0)
            createAndShowExampleWidgetStandaloneWindow<ExampleColorStandaloneWindow>(app);
        else if (std::strcmp(argv[1], "images") == 0)
            createAndShowExampleWidgetStandaloneWindow<ExampleImagesStandaloneWindow>(app);
        else if (std::strcmp(argv[1], "rectangles") == 0)
            createAndShowExampleWidgetStandaloneWindow<ExampleRectanglesStandaloneWindow>(app);
        else if (std::strcmp(argv[1], "shapes") == 0)
            createAndShowExampleWidgetStandaloneWindow<ExampleShapesStandaloneWindow>(app);
#ifdef DGL_OPENGL
        else if (std::strcmp(argv[1], "text") == 0)
            createAndShowExampleWidgetStandaloneWindow<ExampleTextStandaloneWindow>(app);
#endif
        else
            d_stderr2("Invalid demo mode, must be one of: color, images, rectangles or shapes");
    }
    else
    {
        createAndShowExampleWidgetStandaloneWindow<DemoWindow>(app);
    }

    return 0;
}

// --------------------------------------------------------------------------------------------------------------------