#include <LibGUI/GStyle.h>
#include <SharedGraphics/Painter.h>

static GStyle* s_the;

GStyle& GStyle::the()
{
    if (!s_the)
        s_the = new GStyle;
    return *s_the;
}

GStyle::GStyle()
{
}

void GStyle::paint_button(Painter& painter, const Rect& rect, bool pressed)
{
    Color button_color = Color::LightGray;
    Color highlight_color = Color::White;
    Color shadow_color = Color(96, 96, 96);
    painter.draw_rect(rect, Color::Black, true);

    painter.translate(rect.location());

    if (pressed) {
        // Base
        painter.fill_rect({ 1, 1, rect.width() - 2, rect.height() - 2 }, button_color);

        // Sunken shadow
        painter.draw_line({ 1, 1 }, { rect.width() - 2, 1 }, shadow_color);
        painter.draw_line({ 1, 2 }, {1, rect.height() - 2 }, shadow_color);
    } else {
        // Base
        painter.fill_rect({ 3, 3, rect.width() - 5, rect.height() - 5 }, button_color);
        painter.fill_rect_with_gradient({ 3, 3, rect.width() - 5, rect.height() - 5 }, button_color, Color::White);

        // White highlight
        painter.draw_line({ 1, 1 }, { rect.width() - 2, 1 }, highlight_color);
        painter.draw_line({ 1, 2 }, { rect.width() - 3, 2 }, highlight_color);
        painter.draw_line({ 1, 3 }, { 1, rect.height() - 2 }, highlight_color);
        painter.draw_line({ 2, 3 }, { 2, rect.height() - 3 }, highlight_color);

        // Gray shadow
        painter.draw_line({ rect.width() - 2, 1 }, { rect.width() - 2, rect.height() - 4 }, shadow_color);
        painter.draw_line({ rect.width() - 3, 2 }, { rect.width() - 3, rect.height() - 4 }, shadow_color);
        painter.draw_line({ 1, rect.height() - 2 }, { rect.width() - 2, rect.height() - 2 }, shadow_color);
        painter.draw_line({ 2, rect.height() - 3 }, { rect.width() - 2, rect.height() - 3 }, shadow_color);
    }

    painter.translate(-rect.location().x(), -rect.location().y());
}