#ifndef GITFS_GIT_H
#define GITFS_GIT_H

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

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

		template<typename E, typename ... P, typename ... A>
		void
		gitSafe(int (*func)(P...), A ... p)
		{
			if (int _giterror = func(p...)) {
				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 ... p)
		{
			R * r = nullptr;
			gitSafe<E>(get, &r, p...);
			return TPtr<R>(r, release);
		}

		template<typename E, typename R, typename ... P, typename ... A>
		auto
		gitSafeGet(int(*get)(R**, P...), A ... p)
		{
			R * r = nullptr;
			gitSafe<E>(get, &r, p...);
			return r;
		}

		git_oid OidParse(const std::string_view & str);

		using RepositoryPtr = decltype(gitSafeGet<std::exception>(
					git_repository_open_bare, git_repository_free, nullptr));
		RepositoryPtr RepositoryOpenBare(const std::string & path);

		using BlobPtr = decltype(gitSafeGet<std::exception>(
					git_blob_lookup, git_blob_free, nullptr, nullptr));
		BlobPtr BlobLookup(const RepositoryPtr & repo, const git_oid & blob);

		using CommitPtr = decltype(gitSafeGet<std::exception>(
					git_commit_lookup, git_commit_free, nullptr, nullptr));
		CommitPtr CommitLookup(const RepositoryPtr & repo, const git_oid & commitId);

		using TreePtr = decltype(gitSafeGet<std::exception>(
					git_tree_lookup, git_tree_free, nullptr, nullptr));
		TreePtr TreeLookup(const RepositoryPtr & repo, const git_oid & treeId);

		using TreeEntryPtr = decltype(gitSafeGet<std::exception>(
					git_tree_entry_bypath, git_tree_entry_free, nullptr, nullptr));
		TreeEntryPtr TreeEntryByPath(const TreePtr & tree, const std::string & path);

		using RefPtr = decltype(gitSafeGet<std::exception>(
					git_reference_dwim, git_reference_free, nullptr, nullptr));
		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