/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include "EraseTool.h"
#include "ImageEditor.h"
#include "Layer.h"
#include <LibGUI/Action.h>
#include <LibGUI/Menu.h>
#include <LibGUI/Painter.h>
#include <LibGfx/Bitmap.h>

namespace PixelPaint {

EraseTool::EraseTool()
{
}

EraseTool::~EraseTool()
{
}

Gfx::IntRect EraseTool::build_rect(Gfx::IntPoint const& pos, Gfx::IntRect const& widget_rect)
{
    const int base_eraser_size = 10;
    const int eraser_size = (base_eraser_size * m_thickness);
    const int eraser_radius = eraser_size / 2;
    const auto ex = pos.x();
    const auto ey = pos.y();
    return Gfx::IntRect(ex - eraser_radius, ey - eraser_radius, eraser_size, eraser_size).intersected(widget_rect);
}

void EraseTool::on_mousedown(Layer& layer, GUI::MouseEvent& event, GUI::MouseEvent&)
{
    if (event.button() != GUI::MouseButton::Left && event.button() != GUI::MouseButton::Right)
        return;
    Gfx::IntRect r = build_rect(event.position(), layer.rect());
    GUI::Painter painter(layer.bitmap());
    painter.clear_rect(r, get_color());
    layer.did_modify_bitmap();
}

void EraseTool::on_mousemove(Layer& layer, GUI::MouseEvent& event, GUI::MouseEvent&)
{
    if (event.buttons() & GUI::MouseButton::Left || event.buttons() & GUI::MouseButton::Right) {
        Gfx::IntRect r = build_rect(event.position(), layer.rect());
        GUI::Painter painter(layer.bitmap());
        painter.clear_rect(r, get_color());
        layer.did_modify_bitmap();
    }
}

void EraseTool::on_mouseup(Layer&, GUI::MouseEvent& event, GUI::MouseEvent&)
{
    if (event.button() != GUI::MouseButton::Left && event.button() != GUI::MouseButton::Right)
        return;
    m_editor->did_complete_action();
}

void EraseTool::on_tool_button_contextmenu(GUI::ContextMenuEvent& event)
{
    if (!m_context_menu) {
        m_context_menu = GUI::Menu::construct();

        auto eraser_color_toggler = GUI::Action::create_checkable("Use secondary color", [&](auto& action) {
            m_use_secondary_color = action.is_checked();
        });
        eraser_color_toggler->set_checked(m_use_secondary_color);

        m_context_menu->add_action(eraser_color_toggler);
        m_context_menu->add_separator();

        m_thickness_actions.set_exclusive(true);
        auto insert_action = [&](int size, bool checked = false) {
            auto action = GUI::Action::create_checkable(String::number(size), [this, size](auto&) {
                m_thickness = size;
            });
            action->set_checked(checked);
            m_thickness_actions.add_action(*action);
            m_context_menu->add_action(move(action));
        };
        insert_action(1, true);
        insert_action(2);
        insert_action(3);
        insert_action(4);
    }

    m_context_menu->popup(event.screen_position());
}

Color EraseTool::get_color() const
{
    if (m_use_secondary_color)
        return m_editor->secondary_color();
    return Color(255, 255, 255, 0);
}

}