#include "Painter.hpp"
#include "RGB.hpp"
#include "pango/pango-layout.h"
#include "pango/pango-types.h"
#include "pango/pangocairo.h"

namespace Raven {

void Painter::rounded_rectangle(Box &geometry, double border_radius) {
    double aspect = 1.0;
    double radius = border_radius / aspect;
    double degrees = M_PI / 180.0;
    double x = geometry.x();
    double y = geometry.y();
    double w = geometry.width();
    double h = geometry.height();

    m_cairo->begin_new_sub_path();
    m_cairo->arc(x + w - radius, y + radius, radius, -90 * degrees, 0 * degrees);
    m_cairo->arc(x + w - radius, y + h - radius, radius, 0 * degrees, 90 * degrees);
    m_cairo->arc(x + radius, y + h - radius, radius, 90 * degrees, 180 * degrees);
    m_cairo->arc(x + radius, y + radius, radius, 180 * degrees, 270 * degrees);
    m_cairo->close_path();
}

Point Painter::compute_text_size(Box &widget_geometry, std::string &text, PangoFontDescription *pango_font_description) {
    PangoLayout *layout = pango_cairo_create_layout(m_cairo->cobj());

    int font_width;
    int font_height;

    pango_layout_set_font_description(layout, pango_font_description);
    if (widget_geometry.max_width() > 0)
        pango_layout_set_width(layout, pango_units_from_double(widget_geometry.max_width()));
    if (widget_geometry.max_height() > 0)
        pango_layout_set_height(layout, pango_units_from_double(widget_geometry.max_height()));

    pango_layout_set_text(layout, text.c_str(), -1);
    pango_layout_get_size(layout, &font_width, &font_height);

    g_object_unref(layout);

    return { pango_units_to_double(font_width), pango_units_to_double(font_height) };
}

Point Painter::text(Box &geometry, std::string &text, PaintTextAlign align, PangoEllipsizeMode ellipsize, PangoFontDescription *pango_font_description) {
    PangoLayout *layout = pango_cairo_create_layout(m_cairo->cobj());

    int font_width;
    int font_height;
    int pango_width;
    int pango_height;

    pango_layout_set_font_description(layout, pango_font_description);
    if (geometry.width() > 0)
        pango_layout_set_width(layout, pango_units_from_double(geometry.width()));
    if (geometry.height() > 0)
        pango_layout_set_height(layout, pango_units_from_double(geometry.height()));
    pango_layout_set_ellipsize(layout, ellipsize);
    pango_layout_set_text(layout, text.c_str(), -1);

    pango_layout_get_pixel_size(layout, &font_width, &font_height);
    pango_layout_get_size(layout, &pango_width, &pango_height);

    double x = 0;
    double y = ((geometry.height() - font_height) / 2);

    if (align == PaintTextAlign::Center) {
        x = ((geometry.width() - font_width) / 2);
    }

    m_cairo->move_to(x, y);
    pango_cairo_show_layout(m_cairo->cobj(), layout);

    g_object_unref(layout);

    return {pango_units_to_double(pango_width), pango_units_to_double(pango_height)};
}

void Painter::source_rgb(RGB source_rgb) {
    m_cairo->set_source_rgb(source_rgb.r(), source_rgb.g(), source_rgb.b());
}

void Painter::fill() {
    m_cairo->fill();
}

void Painter::begin_paint_group() {
    m_cairo->push_group();
}

void Painter::end_paint_group() {
    m_cairo->pop_group_to_source();
    m_cairo->paint();
}

void Painter::flush_paint_group() {
    m_cairo->pop_group_to_source();
    m_cairo->paint();
    m_cairo->get_target()->flush();
}

}