/*
   Copyright 2005-2010 Jakub Kruszona-Zawadzki, Gemius SA, 2013-2016 Skytechnology sp. z o.o.

   This file is part of LizardFS.

   LizardFS is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, version 3.

   LizardFS is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with LizardFS. If not, see <http://www.gnu.org/licenses/>.
*/

#include "common/platform.h"

#include "mount/client_common.h"
#include "mount/special_inode.h"

using namespace LizardClient;

namespace InodeMasterInfo {
static AttrReply getattr(const Context &ctx, FileInfo */*fi*/, char attrstr[256]) {
	struct stat o_stbuf;
	memset(&o_stbuf, 0, sizeof(struct stat));
	attr_to_stat(inode_, attr, &o_stbuf);
	stats_inc(OP_GETATTR);
	makeattrstr(attrstr, 256, &o_stbuf);
	oplog_printf(ctx, "getattr (%lu) (internal node: MASTERINFO): OK (3600,%s)",
	            (unsigned long int)inode_,
	            attrstr);
	return AttrReply{o_stbuf, 3600.0};
}
} // InodeMasterInfo

namespace InodeStats {
static AttrReply getattr(const Context &ctx, FileInfo */*fi*/, char attrstr[256]) {
	struct stat o_stbuf;
	memset(&o_stbuf, 0, sizeof(struct stat));
	attr_to_stat(inode_, attr, &o_stbuf);
	stats_inc(OP_GETATTR);
	makeattrstr(attrstr, 256, &o_stbuf);
	oplog_printf(ctx, "getattr (%lu) (internal node: STATS): OK (3600,%s)",
	            (unsigned long int)inode_,
	            attrstr);
	return AttrReply{o_stbuf, 3600.0};
}
} // InodeStats

namespace InodeOplog {
static AttrReply getattr(const Context &ctx, FileInfo */*fi*/, char attrstr[256]) {
	struct stat o_stbuf;
	memset(&o_stbuf, 0, sizeof(struct stat));
	attr_to_stat(inode_, attr, &o_stbuf);
	stats_inc(OP_GETATTR);
	makeattrstr(attrstr, 256, &o_stbuf);
	oplog_printf(ctx, "getattr (%lu) (internal node: OPLOG): OK (3600,%s)",
	            (unsigned long int)inode_,
	            attrstr);
	return AttrReply{o_stbuf, 3600.0};
}
} // InodeOplog

namespace InodeOphistory {
static AttrReply getattr(const Context &ctx, FileInfo */*fi*/, char attrstr[256]) {
	struct stat o_stbuf;
	memset(&o_stbuf, 0, sizeof(struct stat));
	attr_to_stat(inode_, attr, &o_stbuf);
	stats_inc(OP_GETATTR);
	makeattrstr(attrstr, 256, &o_stbuf);
	oplog_printf(ctx, "getattr (%lu) (internal node: OPHISTORY): OK (3600,%s)",
	            (unsigned long int)inode_,
	            attrstr);
	return AttrReply{o_stbuf, 3600.0};
}
} // InodeOphistory

namespace InodeTweaks {
static AttrReply getattr(const Context &ctx, FileInfo *fi, char attrstr[256]) {
	struct stat o_stbuf;
	memset(&o_stbuf, 0, sizeof(struct stat));
	attr_to_stat(inode_, attr, &o_stbuf);
	if (fi != NULL) {
		// fstat is called on an open descriptor -- provide the actual length
		MagicFile *file = reinterpret_cast<MagicFile*>(fi->fh);
		std::unique_lock<std::mutex> lock(file->mutex);
		o_stbuf.st_size = file->value.size();
	}
	stats_inc(OP_GETATTR);
	makeattrstr(attrstr, 256, &o_stbuf);
	oplog_printf(ctx, "getattr (%lu) (internal node: TWEAKS_FILE): OK (3600,%s)",
	            (unsigned long int)inode_,
	            attrstr);
	return AttrReply{o_stbuf, 3600.0};
}
} // InodeTweaks

namespace InodeFileByInode {
static AttrReply getattr(const Context &ctx, FileInfo *fi, char attrstr[256]) {
	struct stat o_stbuf;
	memset(&o_stbuf, 0, sizeof(struct stat));
	attr_to_stat(inode_, attr, &o_stbuf);
	if (fi != NULL) {
		// fstat is called on an open descriptor -- provide the actual length
		MagicFile *file = reinterpret_cast<MagicFile*>(fi->fh);
		std::unique_lock<std::mutex> lock(file->mutex);
		o_stbuf.st_size = file->value.size();
	}
	stats_inc(OP_GETATTR);
	makeattrstr(attrstr, 256, &o_stbuf);
	oplog_printf(ctx, "getattr (%lu) (internal node: FILE_BY_INODE_FILE): OK (3600,%s)",
	            (unsigned long int)inode_,
	            attrstr);
	return AttrReply{o_stbuf, 3600.0};
}
} // InodeFileByInode

static const std::array<std::function<AttrReply
	(const Context&, FileInfo*, char[256])>, 16> funcs = {{
	 &InodeStats::getattr,          //0x0U
	 &InodeOplog::getattr,          //0x1U
	 &InodeOphistory::getattr,      //0x2U
	 &InodeTweaks::getattr,         //0x3U
	 &InodeFileByInode::getattr,    //0x4U
	 nullptr,                       //0x5U
	 nullptr,                       //0x6U
	 nullptr,                       //0x7U
	 nullptr,                       //0x8U
	 nullptr,                       //0x9U
	 nullptr,                       //0xAU
	 nullptr,                       //0xBU
	 nullptr,                       //0xCU
	 nullptr,                       //0xDU
	 nullptr,                       //0xEU
	 &InodeMasterInfo::getattr      //0xFU
}};

AttrReply special_getattr(Inode ino, const Context &ctx, FileInfo *fi, char attrstr[256]) {
	auto func = funcs[ino - SPECIAL_INODE_BASE];
	if (!func) {
		lzfs_pretty_syslog(LOG_WARNING,
			"Trying to call unimplemented 'getattr' function for special inode");
		throw RequestException(EINVAL);
	}
	return func(ctx, fi, attrstr);
}
