#include "blob.h"
#include "repo.h"
#include <Ice/Current.h>
#include <Ice/ObjectAdapter.h>
#include <algorithm>
#include <cerrno>
#include <exceptions.h>
#include <file.h>
#include <memory>
#include <sys/stat.h>
#include <types.h>

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

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 = repo->gid;
	a.uid = repo->uid;
	return a;
}

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

long long int
GitFS::Blob::copyrange(FilePrxPtr, long long int, long long int, long long int, int, const Ice::Current &)
{
	throw NetFS::SystemError(EROFS);
}