#include "repo.h"
#include "blob.h"
#include "dir.h"
#include <Ice/Current.h>
#include <Ice/ObjectAdapter.h>
#include <Ice/Proxy.h>
#include <cerrno>
#include <directory.h>
#include <exceptions.h>
#include <file.h>
#include <git2.h>
#include <memory>
#include <sys/stat.h>
#include <types.h>
#include <unistd.h>
#include <utility>

std::string
operator/(const std::string & a, const std::string & b)
{
	return a.empty() ? b : a;
}

GitFS::Repo::Repo(const PropertyReader & properties) :
	repo(Git::RepositoryOpenBare(properties("gitdir"))), commitish(properties("commitish") / "master"), isBranch(false),
	resolvedAt(0), gid(properties("gid") / "root"), uid(properties("uid") / "root")
{
	if (commitish.length() == GIT_OID_HEXSZ) {
		commit = Git::CommitLookup(repo, Git::OidParse(commitish));
	}
	else {
		ref = Git::Commitish(repo, commitish);
		isBranch = git_reference_is_branch(ref.get());
	}
	update();
}

void
GitFS::Repo::update()
{
	if (!commit || (isBranch && ref && resolvedAt < std::time(nullptr) - 30)) {
		commit = Git::CommitLookup(repo, *git_reference_target(Git::Resolve(ref).get()));
		resolvedAt = std::time(nullptr);
	}
	tree = Git::TreeLookup(repo, *git_commit_tree_id(commit.get()));
}

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

NetFS::DirectoryPrxPtr
GitFS::Repo::opendir(ReqEnv, ::std::string path, const ::Ice::Current & ice)
{
	if (path.empty()) {
		throw NetFS::SystemError(EINVAL);
	}

	return Ice::uncheckedCast<NetFS::DirectoryPrx>(
			ice.adapter->addWithUUID(std::make_shared<Directory>(this, std::move(path))));
}

NetFS::VFS
GitFS::Repo::statfs(ReqEnv, ::std::string path, const ::Ice::Current &)
{
	if (path.empty()) {
		throw NetFS::SystemError(EINVAL);
	}

	return {};
}

int
GitFS::Repo::access(ReqEnv, ::std::string path, int mode, const ::Ice::Current &)
{
	if (mode & W_OK) {
		return EACCES;
	}
	if (path.empty()) {
		return EINVAL;
	}
	if (path == "/") {
		return 0;
	}

	try {
		update();
		auto e = Git::TreeEntryByPath(tree, path);
		const auto emode = git_tree_entry_filemode(e.get());

		if (S_ISDIR(emode)) {
			return 0;
		}
		if (S_ISLNK(emode)) {
			return 0;
		}
		if (mode & R_OK && !(S_IRUSR & emode)) {
			return EACCES;
		}
		if (mode & X_OK && !(S_IXUSR & emode)) {
			return EACCES;
		}

		return 0;
	}
	catch (const NetFS::SystemError & e) {
		return e.syserrno;
	}
}

NetFS::Attr
GitFS::Repo::getattr(ReqEnv, ::std::string path, const ::Ice::Current &)
{
	if (path.empty()) {
		throw NetFS::SystemError(EINVAL);
	}

	NetFS::Attr a {};
	if (path == "/") {
		a.mode = S_IFDIR | S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
	}
	else {
		update();
		auto entry = Git::TreeEntryByPath(tree, path);
		a << *entry;
		if (S_ISREG(git_tree_entry_filemode(entry.get()))) {
			auto blob = Git::BlobLookup(repo, *git_tree_entry_id(entry.get()));
			a << *blob;
		}
	}
	a << *commit;
	a.gid = gid;
	a.uid = uid;
	return a;
}

::std::string
GitFS::Repo::readlink(ReqEnv, ::std::string path, const ::Ice::Current &)
{
	if (path.empty() || path == "/") {
		throw NetFS::SystemError(EINVAL);
	}

	update();
	auto e = Git::TreeEntryByPath(tree, path);
	if (!S_ISLNK(git_tree_entry_filemode(e.get()))) {
		throw NetFS::SystemError(EINVAL);
	}
	auto blob = Git::BlobLookup(repo, *git_tree_entry_id(e.get()));
	auto n = static_cast<const ::std::string::value_type *>(git_blob_rawcontent(blob.get()));
	return {n, n + git_blob_rawsize(blob.get())};
}

NetFS::FilePrxPtr
GitFS::Repo::open(ReqEnv, ::std::string path, int, const ::Ice::Current & ice)
{
	if (path.empty()) {
		throw NetFS::SystemError(EINVAL);
	}
	if (path == "/") {
		throw NetFS::SystemError(EISDIR);
	}

	update();
	return Ice::uncheckedCast<NetFS::FilePrx>(ice.adapter->addWithUUID(std::make_shared<Blob>(this, std::move(path))));
}

NetFS::FilePrxPtr
GitFS::Repo::create(ReqEnv, ::std::string, int, int, const ::Ice::Current &)
{
	throw NetFS::SystemError(EROFS);
}

void
GitFS::Repo::truncate(ReqEnv, ::std::string, long long int, const ::Ice::Current &)
{
	throw NetFS::SystemError(EROFS);
}

void
GitFS::Repo::unlink(ReqEnv, ::std::string, const ::Ice::Current &)
{
	throw NetFS::SystemError(EROFS);
}

void
GitFS::Repo::mkdir(ReqEnv, ::std::string, int, const ::Ice::Current &)
{
	throw NetFS::SystemError(EROFS);
}

void
GitFS::Repo::rmdir(ReqEnv, ::std::string, const ::Ice::Current &)
{
	throw NetFS::SystemError(EROFS);
}

void
GitFS::Repo::mknod(ReqEnv, ::std::string, int, int, const ::Ice::Current &)
{
	throw NetFS::SystemError(EROFS);
}

void
GitFS::Repo::symlink(ReqEnv, ::std::string, ::std::string, const ::Ice::Current &)
{
	throw NetFS::SystemError(EROFS);
}

void
GitFS::Repo::link(ReqEnv, ::std::string, ::std::string, const ::Ice::Current &)
{
	throw NetFS::SystemError(EROFS);
}

void
GitFS::Repo::rename(ReqEnv, ::std::string, ::std::string, const Ice::optional<Ice::Int>, const ::Ice::Current &)
{
	throw NetFS::SystemError(EROFS);
}

void
GitFS::Repo::chmod(ReqEnv, ::std::string, int, const ::Ice::Current &)
{
	throw NetFS::SystemError(EROFS);
}

void
GitFS::Repo::chown(ReqEnv, ::std::string, int, int, const ::Ice::Current &)
{
	throw NetFS::SystemError(EROFS);
}

void
GitFS::Repo::utimens(
		ReqEnv, ::std::string, long long int, long long int, long long int, long long int, const ::Ice::Current &)
{
	throw NetFS::SystemError(EROFS);
}