/*

 * Copyright (C) 2007, 2009 Apple Inc. 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 APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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. 

 */

#ifndef TimeRanges_h

#define TimeRanges_h

#include "ExceptionCode.h"

#include <algorithm>

#include <wtf/PassRefPtr.h>

#include <wtf/RefCounted.h>

#include <wtf/Vector.h>

namespace WebCore {

class TimeRanges : public RefCounted<TimeRanges> {

public:

    static PassRefPtr<TimeRanges> create() 

    {

        return adoptRef(new TimeRanges);

    }

    static PassRefPtr<TimeRanges> create(float start, float end)

    {

        return adoptRef(new TimeRanges(start, end));

    }

    PassRefPtr<TimeRanges> copy();

    unsigned length() const { return m_ranges.size(); }

    float start(unsigned index, ExceptionCode&) const;

    float end(unsigned index, ExceptionCode&) const;

    void add(float start, float end);

    bool contain(float time) const;

    float nearest(float time) const;

private:

    TimeRanges() { }

    TimeRanges(float start, float end);

    TimeRanges(const TimeRanges&);

    // We consider all the Ranges to be semi-bounded as follow: [start, end[

    struct Range {

        Range() { }

        Range(float start, float end)

        {

            m_start = start;

            m_end = end;

        }

        float m_start;

        float m_end;

        inline bool isPointInRange(float point) const

        {

            return m_start <= point && point < m_end;

        }

        inline bool isOverlappingRange(const Range& range) const

        {

            return isPointInRange(range.m_start) || isPointInRange(range.m_end) || range.isPointInRange(m_start);

        }

        inline bool isContiguousWithRange(const Range& range) const

        {

            return range.m_start == m_end || range.m_end == m_start;

        }

        inline Range unionWithOverlappingOrContiguousRange(const Range& range) const

        {

            Range ret;

            ret.m_start = std::min(m_start, range.m_start);

            ret.m_end = std::max(m_end, range.m_end);

            return ret;

        }

        inline bool isBeforeRange(const Range& range) const

        {

            return range.m_start >= m_end;

        }

    };

    Vector<Range> m_ranges;

};

} // namespace WebCore

#endif