#include "git.h"
#include <execinfo.h>
#include <exceptions.h>
#include <types.h>
#include <sys/stat.h>

namespace GitFS {
	namespace Git {
		template<>
		[[noreturn]]
		void
		throwError<NetFS::SystemError>(int err)
		{
			switch (err) {
				case GIT_ENOTFOUND:
					throw NetFS::SystemError(ENOENT);
				default:
					throw NetFS::SystemError(EIO);
			}
		}

		template<>
		[[noreturn]]
		void
		throwError<NetFS::ConfigError>(int)
		{
			throw NetFS::ConfigError();
		}

		git_oid OidParse(const std::string_view & str)
		{
			git_oid oid;
			gitSafe<NetFS::ConfigError>(git_oid_fromstrn, &oid, str.data(), str.length());
			return oid;
		}

		RepositoryPtr RepositoryOpenBare(const std::string & path)
		{
			return gitSafeGet<NetFS::ConfigError>(
					git_repository_open_bare, git_repository_free, path.c_str());
		}

		BlobPtr BlobLookup(const RepositoryPtr & repo, const git_oid & blob)
		{
			return gitSafeGet<NetFS::SystemError>(
					git_blob_lookup, git_blob_free, repo.get(), &blob);
		}

		CommitPtr CommitLookup(const RepositoryPtr & repo, const git_oid & commitId)
		{
			return gitSafeGet<NetFS::ConfigError>(
					git_commit_lookup, git_commit_free, repo.get(), &commitId);
		}

		TreePtr TreeLookup(const RepositoryPtr & repo, const git_oid & treeId)
		{
			return gitSafeGet<NetFS::SystemError>(
					git_tree_lookup, git_tree_free, repo.get(), &treeId);
		}

		TreeEntryPtr TreeEntryByPath(const TreePtr & tree, const std::string & path)
		{
			return gitSafeGet<NetFS::SystemError>(
					git_tree_entry_bypath, git_tree_entry_free, tree.get(), path.c_str() + 1);
		}
	}
}

namespace NetFS {
	Attr & operator<<(Attr & a, const git_tree_entry & e)
	{
		a.mode = git_tree_entry_filemode(&e);
		if (S_ISDIR(a.mode)) {
			a.mode |= S_IXUSR | S_IXGRP | S_IXOTH | S_IRUSR | S_IRGRP | S_IROTH;
		}
		else if (S_ISLNK(a.mode)) {
			a.mode |= S_IRUSR | S_IRGRP | S_IROTH;
		}
		else {
			a.mode ^= S_IWUSR;
		}
		return a;
	}

	Attr & operator<<(Attr & a, const git_commit & c)
	{
		a.ctime = a.atime = a.mtime = git_commit_time(&c);
		return a;
	}

	Attr & operator<<(Attr & a, const git_blob & b)
	{
		a.blockSize = 1;
		a.blocks = a.size = git_blob_rawsize(&b);
		return a;
	}
}

namespace std {
	std::ostream &
	operator<<(std::ostream & s, const git_oid & oid)
	{
		char str[GIT_OID_HEXSZ + 1];
		git_oid_tostr(str, sizeof(str), &oid);
		s.write(str, GIT_OID_HEXSZ);
		return s;
	}
}