#include "Mouse.h"
#include <os/File.h>

Mouse::Mouse(ui::Canvas& screen)
{
    m_position.x = screen.width / 2;
    m_position.y = screen.height / 2;
    m_screen_rect = screen.rect();
}

void Mouse::draw(ui::Canvas& screen)
{
    auto canvas = screen.subcanvas(ui::Rect { m_position, 10, 10 });
    canvas.fill(ui::WHITE);
}

void Mouse::update(const moon::MousePacket& packet)
{
    m_position.x += packet.xdelta;
    m_position.y -= packet.ydelta;
    m_position = m_screen_rect.normalize(m_position);

    if (m_dragging_window && !(packet.buttons & moon::MouseButton::Left))
    {
        os::println("Stopped drag: window at (%d,%d,%d,%d) with offset (%d,%d)", m_dragging_window->surface.pos.x,
                    m_dragging_window->surface.pos.y, m_dragging_window->surface.width,
                    m_dragging_window->surface.height, this->m_initial_drag_position.x,
                    this->m_initial_drag_position.y);
        m_dragging_window = nullptr;
    }

    if (m_dragging_window)
    {
        m_dragging_window->surface.pos =
            ui::Point { m_position.x - m_initial_drag_position.x, m_position.y - m_initial_drag_position.y };
        m_dragging_window->surface = m_dragging_window->surface.normalized();
    }

    else if ((packet.buttons & moon::MouseButton::Left) && !m_dragging_window)
    {
        // Iterate from the end of the list, since windows at the beginning are stacked at the bottom and windows at the
        // top are at the end.
        for (Window* window = g_windows.last().value_or(nullptr); window;
             window = g_windows.previous(window).value_or(nullptr))
        {
            if (window->surface.absolute(window->close_button).contains(m_position))
            {
                // Close button pressed
                g_windows.remove(window);
                delete window;
                break;
            }
            else if (window->surface.absolute(window->titlebar).contains(m_position))
            {
                m_dragging_window = window;
                m_initial_drag_position = window->surface.relative(m_position);
                os::println("Started drag: window at (%d,%d,%d,%d) with offset (%d,%d)", window->surface.pos.x,
                            window->surface.pos.y, window->surface.width, window->surface.height,
                            m_initial_drag_position.x, m_initial_drag_position.y);
                window->focus();
                break;
            }
            else if (window->surface.absolute(window->contents).contains(m_position))
            {
                window->focus();
                break; // We don't want to continue iterating, otherwise this would take into account windows whose
                       // titlebar is underneath another window's contents!
            }
        }
    }
}