/*
 * Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include <AK/String.h>
#include <AK/Vector.h>
#include <LibDiff/Hunks.h>
#include <LibGUI/ScrollableWidget.h>

namespace HackStudio {
class DiffViewer final : public GUI::ScrollableWidget {
    C_OBJECT(DiffViewer)
public:
    virtual ~DiffViewer() override;

    void set_content(const String& original, const String& diff);

private:
    DiffViewer(const String& original, const String& diff);
    DiffViewer();

    void setup_properties();

    virtual void paint_event(GUI::PaintEvent&) override;
    virtual void resize_event(GUI::ResizeEvent&) override;

    void update_content_size();

    enum class LinePosition {
        Left,
        Right,
        Both,
    };

    enum class LineType {
        Normal,
        Diff,
        Missing,
    };

    void draw_line(GUI::Painter&, const String& line, size_t y_offset, LinePosition, LineType);

    static Vector<String> split_to_lines(const String& text);

    static Gfx::Color red_background();
    static Gfx::Color green_background();
    static Gfx::Color gray_background();

    size_t line_height() const;

    Gfx::IntRect separator_rect() const;

    Vector<String> m_original_lines;
    Vector<Diff::Hunk> m_hunks;
};
}