/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 * 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/RefPtr.h>
#include <LibWeb/DOM/Node.h>
#include <LibWeb/Forward.h>

namespace Web::DOM {

class Position {
public:
    Position() { }
    Position(Node&, unsigned offset);

    ~Position();

    bool is_valid() const { return m_node; }

    Node* node() { return m_node; }
    const Node* node() const { return m_node; }

    unsigned offset() const { return m_offset; }
    void set_offset(unsigned value) { m_offset = value; }

    bool operator==(const Position& other) const
    {
        return m_node == other.m_node && m_offset == other.m_offset;
    }

    bool operator!=(const Position& other) const
    {
        return !(*this == other);
    }

private:
    RefPtr<Node> m_node;
    unsigned m_offset { 0 };
};

class Range {
public:
    Range() = default;
    Range(const Position& start, const Position& end)
        : m_start(start)
        , m_end(end)
    {
    }

    bool is_valid() const { return m_start.is_valid() && m_end.is_valid(); }

    void set(const Position& start, const Position& end)
    {
        m_start = start;
        m_end = end;
    }

    void set_start(const Position& start) { m_start = start; }
    void set_end(const Position& end) { m_end = end; }

    const Position& start() const { return m_start; }
    Position& start() { return m_start; }

    const Position& end() const { return m_end; }
    Position& end() { return m_end; }

    Range normalized() const;

private:
    Position m_start, m_end;
};

const LogStream& operator<<(const LogStream&, const Position&);

}