#include "git.h"
#include <array>
#include <cerrno>
#include <exceptions.h>
#include <numeric.h>
#include <sys/stat.h>
#include <types.h>

namespace GitFS::Git {
	template<>
	[[noreturn]] void
	throwError<NetFS::SystemError>(int err)
	{
		if (err == GIT_ENOTFOUND) {
			throw NetFS::SystemError(ENOENT);
		}
		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)
	{
		// NOLINTNEXTLINE(cppcoreguidelines-pro-bounds-pointer-arithmetic) Skip leading / with C interface
		return gitSafeGet<NetFS::SystemError>(git_tree_entry_bypath, git_tree_entry_free, tree.get(), path.c_str() + 1);
	}

	RefPtr
	commitish(const RepositoryPtr & repo, const std::string & name)
	{
		return gitSafeGet<NetFS::ConfigError>(git_reference_dwim, git_reference_free, repo.get(), name.c_str());
	}

	RefPtr
	resolve(const RefPtr & ref)
	{
		return gitSafeGet<NetFS::ConfigError>(git_reference_resolve, git_reference_free, ref.get());
	}
}

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

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

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

namespace std {
	std::ostream &
	operator<<(std::ostream & strm, const git_oid & oid)
	{
		std::array<char, GIT_OID_HEXSZ + 1> str {};
		git_oid_tostr(str.data(), str.size(), &oid);
		strm.write(str.data(), GIT_OID_HEXSZ);
		return strm;
	}
}