// Berkeley Open Infrastructure for Network Computing
// http://boinc.berkeley.edu
// Copyright (C) 2005 University of California
//
// This is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation;
// either version 2.1 of the License, or (at your option) any later version.
//
// This software 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 Lesser General Public License for more details.
//
// To view the GNU Lesser General Public License visit
// http://www.gnu.org/copyleft/lesser.html
// or write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

// A sample validator that grants credit if the majority of results are
// bit-wise identical.

#include "config.h"
#include "util.h"
#include "sched_util.h"
#include "sched_msgs.h"
#include "validate_util.h"
#include "md5_file.h"

using std::string;
using std::vector;


class FileCache {
    mutable string _md5sum;
public:
    const string filedata;

    FileCache(string const& filedata0) : filedata(filedata0) {}

    string const md5sum() const {
        if (_md5sum.empty()) {
            _md5sum = md5_string(filedata);
        }
        return _md5sum;
    }
};

bool operator ==(FileCache const& f1, FileCache const& f2)
{
    return (f1.md5sum() == f2.md5sum() &&
            f1.filedata == f2.filedata);
}

// read file into memory
//
int init_result_read_file(RESULT const & result, void*& data)
{
    int retval;
    string path;

    retval = get_output_file_path(result, path);
    if (retval) {
        log_messages.printf(
            SCHED_MSG_LOG::MSG_CRITICAL,
            "[RESULT#%d %s] check_set: can't get output filename\n",
            result.id, result.name
        );
        return retval;
    }

    string filedata;
    retval = read_file_string(path.c_str(), filedata);
    if (retval) {
        log_messages.printf(
            SCHED_MSG_LOG::MSG_CRITICAL,
            "[RESULT#%d %s] Couldn't open %s\n",
            result.id, result.name, path.c_str()
        );
        return retval;
    }
    FileCache *f = new FileCache(filedata);
    data = (void*) f;

    return 0;
}

int check_pair_initialized_identical(
    RESULT & /*r1*/, void* data1,
    RESULT const& /*r2*/, void* data2,
    bool& match)
{
    FileCache const* f1 = (FileCache*) data1;
    FileCache const* f2 = (FileCache*) data2;

    match = (*f1 == *f2);
    return 0;
}

int cleanup_result_string(RESULT const& /*result*/, void* data) {
    delete (FileCache*) data;
    return 0;
}

// See if there's a strict majority under equality.
//
int check_set(
    vector<RESULT>& results, WORKUNIT& wu, int& canonicalid, double& credit,
    bool& retry
) {
    retry = false;
    return generic_check_set(
        results, canonicalid, credit,
        init_result_read_file,
        check_pair_initialized_identical,
        cleanup_result_string,
        wu.min_quorum/2+1
    );
}

int check_pair(
    RESULT & r1, RESULT const& r2, bool& retry
) {
    retry = false;
    int retval = generic_check_pair(
        r1, r2,
        init_result_read_file,
        check_pair_initialized_identical,
        cleanup_result_string
    );
    return retval;
}


const char *BOINC_RCSID_7ab2b7189c = "$Id$";