#include "Layer.h"
#include "Client.h"
#include "Window.h"

Layer l_background;
Layer l_global;
Layer l_global_top;
Layer l_system;
Layer l_lock;

constexpr int NUM_LAYERS = 5;

static Layer* const layers_front_to_back[NUM_LAYERS] = { &l_lock, &l_system, &l_global_top, &l_global, &l_background };
static Layer* const layers_back_to_front[NUM_LAYERS] = { &l_background, &l_global, &l_global_top, &l_system, &l_lock };

Window* Layer::focused_window()
{
    for (int i = 0; i < NUM_LAYERS; i++)
    {
        Layer* l = layers_front_to_back[i];
        if (l->windows.last().has_value()) return l->windows.last().value();
    }

    return nullptr;
}

void Layer::draw_all_windows(ui::Canvas& canvas)
{
    for (int i = 0; i < NUM_LAYERS; i++)
    {
        Layer* l = layers_back_to_front[i];
        for (Window* w : l->windows) { w->draw(canvas); }
    }
}

Window* Layer::propagate_mouse_event(ui::Point position, u8 buttons)
{
    for (int i = 0; i < NUM_LAYERS; i++)
    {
        Layer* l = layers_front_to_back[i];
        for (Window* window = l->windows.last().value_or(nullptr); window;
             window = l->windows.previous(window).value_or(nullptr))
        {
            if (window->surface.contains(position))
            {
                ui::MouseEventRequest request;
                request.window = window->id;
                request.position = window->surface.relative(position);
                request.buttons = buttons;
                window->client->conn->send_async(request);
                return window;
            }
        }
    }

    return nullptr;
}

Window* Layer::propagate_drag_event(ui::Point position)
{
    for (int i = 0; i < NUM_LAYERS; i++)
    {
        Layer* l = layers_front_to_back[i];
        for (Window* window = l->windows.last().value_or(nullptr); window;
             window = l->windows.previous(window).value_or(nullptr))
        {
            if (window->surface.contains(position))
            {
                window->focus();

                if (window->surface.absolute(window->titlebar).contains(position)) return window;

                return nullptr;
            }
        }
    }

    return nullptr;
}