// 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

// Code to facilitate writing validators.
// Can be used as the basis for a validator that accepts everything
// (see validate_trivial.C),
// or that requires strict or fuzzy equality.

#include <cassert>

#include "error_numbers.h"
#include "parse.h"
#include "util.h"
#include "filesys.h"

#include "sched_util.h"
#include "sched_config.h"
#include "sched_msgs.h"
#include "validate_util.h"

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

extern SCHED_CONFIG config;

// get the name of a result's (first) output file
//
int get_output_file_path(RESULT const& result, string& path_str) {
    char buf[256], path[256];

    if (!parse_str(result.xml_doc_out, "<name>", buf, sizeof(buf))) {
        return ERR_XML_PARSE;
    }
    dir_hier_path(buf, config.upload_dir, config.uldl_dir_fanout, path);
    path_str = path;
    return 0;
}


#define CREDIT_EPSILON .001

// If we have N correct results with nonzero claimed credit,
// compute a canonical credit as follows:
// - if N==0 (all claimed credits are infinitesmal), return CREDIT_EPSILON
// - if N==1, return that credit
// - if N==2, return min
// - if N>2, toss out min and max, return average of rest
//
double median_mean_credit(vector<RESULT>& results) {
    int ilow=-1, ihigh=-1;
    double credit_low = 0, credit_high = 0;
    int nvalid = 0;
    unsigned int i;

    for (i=0; i<results.size(); i++) {
        RESULT& result = results[i];
        if (result.validate_state != VALIDATE_STATE_VALID) continue;
        if (result.claimed_credit < CREDIT_EPSILON) continue;
        if (ilow < 0) {
            ilow = ihigh = i;
            credit_low = credit_high = result.claimed_credit;
        } else {
            if (result.claimed_credit < credit_low) {
                ilow = i;
                credit_low = result.claimed_credit;
            }
            if (result.claimed_credit > credit_high) {
                ihigh = i;
                credit_high = result.claimed_credit;
            }
        }
        nvalid++;
    }

    switch(nvalid) {
    case 0:
        return CREDIT_EPSILON;
    case 1:
    case 2:
        return credit_low;
    default:
        double sum = 0;
        for (i=0; i<results.size(); i++) {
            if (i == (unsigned int) ilow) continue;
            if (i == (unsigned int) ihigh) continue;
            RESULT& result = results[i];
            if (result.validate_state != VALIDATE_STATE_VALID) continue;

            sum += result.claimed_credit;
        }
        return sum/(nvalid-2);
    }
}

// Generic validation function that compares each result to each other one and
// sees if MIN_VALID results match.
// The comparison function is similar to check_pair
// but takes an additional data parameter.
//
// This function takes 3 call-back functions, each of which accept a void*
// and should return !=0 on error:
//
//    1. init_result - initialize all results - for example, call
//       read_file_string and compute an MD5. Return a void*
//    2. check_pair_with_data - same as check_pair but with extra data from
//       init_result
//    3. cleanup_result - deallocate anything created by init_result.
//       Should do nothing with NULL data
//
// see validate_test.C example usage.
//
int generic_check_set(
    vector<RESULT>& results, int& canonicalid, double& credit,
    init_result_f init_result_f,
    check_pair_with_data_f check_pair_with_data_f,
    cleanup_result_f cleanup_result_f,
    int min_valid
) {
    vector<void*> data;
    int i, j, neq = 0, n;

    n = results.size();
    data.resize(n);

    // 1. INITIALIZE DATA

    for (i=0; i!=n; i++) {
        if (init_result_f(results[i], data[i])) {
            log_messages.printf(
                SCHED_MSG_LOG::CRITICAL,
                "generic_check_set: init_result([RESULT#%d %s]) failed\n",
                results[i].id, results[i].name
            );
            goto cleanup;
        }
    }

    // 2. COMPARE

    for (i=0; i!=n; i++) {
        vector<bool> matches;
        matches.resize(n);
        neq = 0;
        for (j=0; j!=n; j++) {
            bool match = false;
            if (i == j) {
                ++neq;
                matches[j] = true;
            } else if (check_pair_with_data_f(results[i], data[i], results[j], data[j], match)) {
                log_messages.printf(
                    SCHED_MSG_LOG::CRITICAL,
                    "generic_check_set: check_pair_with_data([RESULT#%d %s], [RESULT#%d %s]) failed\n",
                    results[i].id, results[i].name, results[j].id, results[j].name
                );
            } else if (match) {
                ++neq;
                matches[j] = true;
            }
        }
        if (neq >= min_valid) {

            // set validate state for each result
            //
            for (j=0; j!=n; j++) {
                results[j].validate_state = matches[j] ? VALIDATE_STATE_VALID : VALIDATE_STATE_INVALID;
            }
            canonicalid = results[i].id;
            credit = median_mean_credit(results);
            break;
        }
    }

cleanup:

    // 3. CLEANUP

    for (i=0; i!=n; i++) {
        cleanup_result_f(results[i], data[i]);
    }
    return 0;
}

int generic_check_pair(
    RESULT & r1, RESULT const& r2,
    init_result_f init_result_f,
    check_pair_with_data_f check_pair_with_data_f,
    cleanup_result_f cleanup_result_f
) {
    void* data1;
    void* data2;
    int retval;
    bool match;

    retval = init_result_f(r1, data1);
    if (retval) {
        log_messages.printf(
            SCHED_MSG_LOG::CRITICAL,
            "[RESULT#%d %s] [RESULT#%d %s] Couldn't initialize result 1\n",
            r1.id, r1.name, r2.id, r2.name
        );
        return retval;
    }

    retval = init_result_f(r2, data2);
    if (retval) {
        log_messages.printf(
            SCHED_MSG_LOG::CRITICAL,
            "[RESULT#%d %s] [RESULT#%d %s] Couldn't initialize result 2\n",
            r1.id, r1.name, r2.id, r2.name
        );
        cleanup_result_f(r1, data1);
        return retval;
    }

    retval = check_pair_with_data_f(r1, data1, r2, data2, match);
    r1.validate_state = match?VALIDATE_STATE_VALID:VALIDATE_STATE_INVALID;

    cleanup_result_f(r1, data1);
    cleanup_result_f(r2, data2);

    return retval;
}

const char *BOINC_RCSID_07049e8a0e = "$Id$";