#include <Ice/ObjectAdapter.h>
#include <sys/stat.h>
#include "blob.h"
#include "repo.h"

GitFS::Blob::Blob(const Repo * r, const std::string & path) :
	repo(r),
	entry(getTreeEntry(path)),
	blob(getBlob()),
	blobSize(git_blob_rawsize(blob.get())),
	blobContent(static_cast<const char *>(git_blob_rawcontent(blob.get())))
{
}

GitFS::Git::TreeEntryPtr
GitFS::Blob::getTreeEntry(const std::string & path) const
{
	try {
		return Git::TreeEntryByPath(repo->tree, path);
	}
	catch (const Git::Error & e) {
		Git::ErrorToSystemError(e);
	}
}

GitFS::Git::BlobPtr
GitFS::Blob::getBlob() const
{
	const auto mode = git_tree_entry_filemode(entry.get());

	if (S_ISDIR(mode)) throw NetFS::SystemError(EISDIR);
	if (S_ISLNK(mode)) throw NetFS::SystemError(ELOOP);

	return Git::BlobLookup(repo->repo, *git_tree_entry_id(entry.get()));
}

void
GitFS::Blob::close(const ::Ice::Current& current)
{
	current.adapter->remove(current.id);
}


NetFS::Attr
GitFS::Blob::fgetattr(ReqEnv, const ::Ice::Current&)
{
	NetFS::Attr a;
	a << *blob << *entry << *repo->commit;
	a.gid = a.uid = "root";
	return a;
}


NetFS::Buffer
GitFS::Blob::read(long long int offset, long long int size, const ::Ice::Current&)
{
	if (offset > blobSize) {
		return {};
	}
	auto len = std::min(blobSize - offset, size);
	return NetFS::Buffer(blobContent + offset, blobContent + offset + len);
}


void
GitFS::Blob::ftruncate(ReqEnv, long long int, const ::Ice::Current&)
{
	throw NetFS::SystemError(EROFS);
}


void
GitFS::Blob::write(long long int, long long int, Buffer, const ::Ice::Current&)
{
	throw NetFS::SystemError(EROFS);
}