#include "Window.h"
#include <luna/Utf8.h>
#include <os/File.h>
#include <ui/Font.h>
#include <ui/Image.h>

LinkedList<Window> g_windows;

static SharedPtr<ui::Image> g_close_icon;

void Window::draw(ui::Canvas& screen)
{
    auto window = screen.subcanvas(surface);
    window.subcanvas(contents).fill(color);

    wchar_t buffer[4096];
    Utf8StringDecoder decoder(name.chars());
    decoder.decode(buffer, sizeof(buffer)).release_value();

    auto font = ui::Font::default_font();

    auto titlebar_canvas = window.subcanvas(titlebar);
    titlebar_canvas.fill(ui::GRAY);

    auto textarea = titlebar_canvas.subcanvas(ui::Rect { 10, 10, titlebar_canvas.width - 10, titlebar_canvas.height });
    font->render(buffer, ui::BLACK, textarea);

    if (g_close_icon)
    {
        auto close_area = window.subcanvas(close_button);
        close_area.fill(g_close_icon->pixels(), g_close_icon->width());
    }
}

void Window::focus()
{
    // Bring the window to the front of the list.
    g_windows.remove(this);
    g_windows.append(this);
}

Window::Window(ui::Rect r, ui::Color c, StringView n) : surface(r), color(c), name(n)
{
    auto font = ui::Font::default_font();
    titlebar = ui::Rect { 0, 0, surface.width, font->height() + 20 };
    close_button = ui::Rect { surface.width - 26, 10, 16, 16 };
    contents = ui::Rect { 0, font->height() + 20, surface.width, surface.height - (font->height() + 20) };
    g_windows.append(this);

    if (!g_close_icon) g_close_icon = ui::Image::load("/usr/share/icons/16x16/app-close.tga").value_or({});
}