#pragma once

#include <optional>
#include <string>
#include <string_view>
#include <vector>

namespace breeze
{

	/// A semantic version: major.minor.patch with an optional pre-release tag.
	/// A pre-release sorts before the release it leads up to (1.0.0-rc1 < 1.0.0).
	struct Version
	{
		int major = 0;
		int minor = 0;
		int patch = 0;
		std::string pre;

		[[nodiscard]] std::string toString() const;
	};

	/// Accepts "1.2.3", "v1.2.3", "1.2.3-rc1", "1.2" (patch 0) and "1" (minor and patch 0);
	/// anything else, including build metadata after '+', is dropped or rejected.
	std::optional<Version> parseVersion(std::string_view text);

	int compare(const Version& a, const Version& b);
	bool operator<(const Version& a, const Version& b);
	bool operator==(const Version& a, const Version& b);

	/// The greatest of `versions`; with `sameMajorAs`, only of those with that major version.
	std::optional<Version> greatest(const std::vector<Version>& versions,
									std::optional<int> sameMajorAs = std::nullopt);

}