#ifndef GITFS_GIT_H
#define GITFS_GIT_H

#include <git2.h>
#include <memory>
#include <ostream>
#include <string>
#include <string_view>

namespace GitFS::Git {
	template<typename E> [[noreturn]] void throwError(int err);

	template<typename E, typename... P, typename... A>
	void
	gitSafe(int (*func)(P...), A... params)
	{
		if (int giterror = func(params...)) {
			throwError<E>(giterror);
		}
	}

	template<typename T> using TPtr = std::shared_ptr<T>;

	template<typename E, typename R, typename... P, typename... A>
	auto
	gitSafeGet(int (*get)(R **, P...), void (*release)(R *), A... params)
	{
		R * rtn = nullptr;
		gitSafe<E>(get, &rtn, params...);
		return TPtr<R>(rtn, release);
	}

	git_oid oidParse(std::string_view str);

	using RepositoryPtr = TPtr<git_repository>;
	RepositoryPtr repositoryOpenBare(const std::string & path);

	using BlobPtr = TPtr<const git_blob>;
	BlobPtr blobLookup(const RepositoryPtr & repo, const git_oid & blob);

	using CommitPtr = TPtr<const git_commit>;
	CommitPtr commitLookup(const RepositoryPtr & repo, const git_oid & commitId);

	using TreePtr = TPtr<const git_tree>;
	TreePtr treeLookup(const RepositoryPtr & repo, const git_oid & treeId);

	using TreeEntryPtr = TPtr<const git_tree_entry>;
	TreeEntryPtr treeEntryByPath(const TreePtr & tree, const std::string & path);

	using RefPtr = TPtr<const git_reference>;
	RefPtr commitish(const RepositoryPtr & repo, const std::string & name);
	RefPtr resolve(const RefPtr &);
}

namespace NetFS {
	struct Attr;
	Attr & operator<<(Attr &, const git_tree_entry &);
	Attr & operator<<(Attr &, const git_commit &);
	Attr & operator<<(Attr &, const git_blob &);
}

namespace std {
	std::ostream & operator<<(std::ostream &, const git_oid &);
}

#endif