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

#include "PenTool.h"
#include "ImageEditor.h"
#include "Layer.h"
#include <LibGUI/Action.h>
#include <LibGUI/BoxLayout.h>
#include <LibGUI/Label.h>
#include <LibGUI/Menu.h>
#include <LibGUI/Painter.h>
#include <LibGUI/ValueSlider.h>

namespace PixelPaint {

PenTool::PenTool()
{
}

PenTool::~PenTool()
{
}

void PenTool::on_mousedown(Layer* layer, MouseEvent& event)
{
    if (!layer)
        return;

    auto& layer_event = event.layer_event();
    if (layer_event.button() != GUI::MouseButton::Left && layer_event.button() != GUI::MouseButton::Right)
        return;

    GUI::Painter painter(layer->bitmap());
    painter.draw_line(layer_event.position(), layer_event.position(), m_editor->color_for(layer_event), m_thickness);
    layer->did_modify_bitmap(Gfx::IntRect::centered_on(layer_event.position(), Gfx::IntSize { m_thickness + 2, m_thickness + 2 }));
    m_last_drawing_event_position = layer_event.position();
}

void PenTool::on_mouseup(Layer* layer, MouseEvent& event)
{
    if (!layer)
        return;

    auto& layer_event = event.layer_event();
    if (layer_event.button() == GUI::MouseButton::Left || layer_event.button() == GUI::MouseButton::Right) {
        m_last_drawing_event_position = { -1, -1 };
        m_editor->did_complete_action();
    }
}

void PenTool::on_mousemove(Layer* layer, MouseEvent& event)
{
    if (!layer)
        return;

    auto& layer_event = event.layer_event();
    if (!(layer_event.buttons() & GUI::MouseButton::Left || layer_event.buttons() & GUI::MouseButton::Right))
        return;
    GUI::Painter painter(layer->bitmap());

    Gfx::IntRect changed_rect;
    if (m_last_drawing_event_position != Gfx::IntPoint(-1, -1)) {
        painter.draw_line(m_last_drawing_event_position, layer_event.position(), m_editor->color_for(layer_event), m_thickness);
        changed_rect = Gfx::IntRect::from_two_points(m_last_drawing_event_position, layer_event.position());
    } else {
        painter.draw_line(layer_event.position(), layer_event.position(), m_editor->color_for(layer_event), m_thickness);
        changed_rect = Gfx::IntRect::from_two_points(layer_event.position(), layer_event.position());
    }
    changed_rect.inflate(m_thickness + 2, m_thickness + 2);
    layer->did_modify_bitmap(changed_rect);

    m_last_drawing_event_position = layer_event.position();
}

GUI::Widget* PenTool::get_properties_widget()
{
    if (!m_properties_widget) {
        m_properties_widget = GUI::Widget::construct();
        m_properties_widget->set_layout<GUI::VerticalBoxLayout>();

        auto& thickness_container = m_properties_widget->add<GUI::Widget>();
        thickness_container.set_fixed_height(20);
        thickness_container.set_layout<GUI::HorizontalBoxLayout>();

        auto& thickness_label = thickness_container.add<GUI::Label>("Thickness:");
        thickness_label.set_text_alignment(Gfx::TextAlignment::CenterLeft);
        thickness_label.set_fixed_size(80, 20);

        auto& thickness_slider = thickness_container.add<GUI::ValueSlider>(Orientation::Horizontal, "px");
        thickness_slider.set_range(1, 20);
        thickness_slider.set_value(m_thickness);

        thickness_slider.on_change = [&](int value) {
            m_thickness = value;
        };
        set_primary_slider(&thickness_slider);
    }

    return m_properties_widget.ptr();
}

}