// Copyright (c) 2010, Niels Martin Hansen
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//   * Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//   * Redistributions in binary form must reproduce the above copyright notice,
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// Aegisub Project http://www.aegisub.org/

#include <cassert>

/// @class TimeRange
/// @brief Represents an immutable range of time
class TimeRange {
	int _begin;
	int _end;

public:
	/// @brief Constructor
	/// @param begin Index of the first millisecond to include in the range
	/// @param end   Index of one past the last millisecond to include in the range
	TimeRange(int begin, int end)
	: _begin(begin), _end(end)
	{
		assert(end >= begin);
	}

	/// Get the length of the range in milliseconds
	int length() const { return _end - _begin; }
	/// Get the start time of the range in milliseconds
	int begin() const { return _begin; }
	/// Get the exclusive end time of the range in milliseconds
	int end() const { return _end; }

	/// Determine whether the range contains a given time in milliseconds
	bool contains(int ms) const { return ms >= begin() && ms < end(); }

	/// Determine whether there is an overlap between two ranges
	bool overlaps(const TimeRange &other) const
	{
		return other.contains(_begin) || contains(other._begin);
	}
};