/* Copyright (C) 2014 InfiniDB, Inc.

   This program 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 2 of
   the License.

   This program 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 this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301, USA. */
   
   
   
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <boost/thread.hpp>
#include <unistd.h>
#include <list>
#include <string>

#include "SMFileSystem.h"
#include "SMDataFile.h"
#include "SMFileFactory.h"
#include "sm_exceptions.h"
#include "messageFormat.h"

/* The purpose of this is to test the idbdatafile cloud classes using a dummy
SessionManager defined in this file. */

#undef NDEBUG
#include <assert.h>

using namespace idbdatafile;
using namespace std;

volatile bool die = false;
int errCode = 0;
 
/* Right now this will just accept one connection & send a fixed error response */
void error_server_thread()
{
    struct sockaddr_un addr;
    memset(&addr, 0, sizeof(addr));
    addr.sun_family = AF_UNIX;
    strcpy(&addr.sun_path[1], &storagemanager::socket_name[1]);
    
    int server_socket = ::socket(AF_UNIX, SOCK_STREAM, 0);
    assert(server_socket >= 0);
    
    int err = ::bind(server_socket, (struct sockaddr *) &addr, sizeof(addr));
    assert(err == 0);
    
    err = ::listen(server_socket, 1);
    assert(err == 0);
    
    socklen_t addrlen;
    struct sockaddr_un client_addr;
    memset(&client_addr, 0, sizeof(client_addr));
    int client_socket = ::accept(server_socket, (struct sockaddr *) &client_addr, &addrlen);
    assert(client_socket >= 0);
    
    //cout << "server thread got a connection" << endl;
    
    uint8_t buf[4096];
    uint32_t response[4] = { storagemanager::SM_MSG_START, 8, (uint32_t ) -1, EINVAL };
    uint remainingBytes = 0;
    
    while (!die) 
    {
        /* This just scans for SM_MSG_START, and as it finds them it sends a generic error
           response. */
        
        err = ::recv(client_socket, &buf[remainingBytes], 4096 - remainingBytes, MSG_DONTWAIT);
        if (err < 0)
        {
            if (errno == EAGAIN || errno == EWOULDBLOCK)
            {
                //cout << "server looping..." << endl;
                sleep(1);   // who cares
                continue;
            }
            else {
                char errbuf[80];
                //cout << "server thread got an error: " << strerror_r(errno, errbuf, 80) << endl;
                close(client_socket);
                errCode = -1;
                die = true;
                return;
            }
        }
        
        //cout << "server thread got some data" << endl;
        uint endOfData = remainingBytes + err;
        uint i;
        if (endOfData < 4)
        {
            remainingBytes = endOfData;
            continue;
        }
        for (i = 0; i <= endOfData - 4; i++)
        {
            if (*((uint32_t *) &buf[i]) == storagemanager::SM_MSG_START) {
                //cout << "server thread found a msg start magic" << endl;
                err = ::send(client_socket, response, 16, 0);
                assert(err > 0);
            }
        }
        memmove(buf, &buf[i], endOfData - i);   // should be the trailing 3 bytes of the data
        remainingBytes = endOfData - i;
    }
} 
 
int test1()
{
    /* Start a server thread that returns generic errors */
    boost::thread server_thread(error_server_thread);
    
    /* Instantiate each of SM subclasses, call each function, and verify the expected error response */
    int err;
    SMFileFactory factory;
    
    cout << "open" << endl;
    IDBDataFile *f = factory.open("dummy", "r", 0, 0);
    assert(f == NULL && errno == EINVAL && !die);
    
    SMFileSystem filesystem;
    
    cout << "compressedSize" << endl;
    bool gotException = false;
    try {
        filesystem.compressedSize("dummy");
    }
    catch (NotImplementedYet &) {
        gotException = true;
    }
    assert(gotException && !die);
    
    cout << "copyFile" << endl;
    try {
        filesystem.copyFile("dummy1", "dummy2");
    }
    catch (NotImplementedYet &) {
        gotException = true;
    }
    assert(gotException && !die);
    
    cout << "exists" << endl;
    err = filesystem.exists("dummy");
    assert(!err);
    
    cout << "filesystemisup" << endl;
    err = filesystem.filesystemIsUp();
    assert(!err && !die);
    
    cout << "isdir" << endl;
    err = filesystem.isDir("dummy");
    assert(!err && !die);
    
    cout << "listdirectory" << endl;
    list<string> filenames;
    err = filesystem.listDirectory("dummy", filenames);
    assert(err == -1 && filenames.empty() && !die);
    
    // done, return errCode
    die = true;
    server_thread.join();
    return errCode;
}

int main()
{
    int ret;
    
    ret = test1();
    return ret;
}