// This file is part of BOINC.
// http://boinc.berkeley.edu
// Copyright (C) 2013 University of California
//
// BOINC 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 3 of the License, or (at your option) any later version.
//
// BOINC 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.
//
// You should have received a copy of the GNU Lesser General Public License
// along with BOINC.  If not, see <http://www.gnu.org/licenses/>.

// The following is a deadline trickle handler.
// It extends the deadline of the result the app sends us.
// This prevents duplicating the job when the original deadline is reached.
// Note: there is no effect on the client;
// currently there's no mechanism for sending the new deadline to the client.

// trickle message format:
//
// <result_name>x</result_name>
// <cpu_time>x</cpu_time>
//
// Required cmdline arg:
//
// --extension_period X     add X seconds to the current deadline
// --extension_timeframe X  extend only if deadline is within the next X seconds
//

#include "util.h"
#include "sched_msgs.h"
#include "trickle_handler.h"

double extension_period = 0;
double extension_timeframe = 0;

int handle_trickle_init(int argc, char** argv) {
    for (int i=1; i<argc; i++) {
        if (!strcmp(argv[i], "--extension_period")) {
            extension_period = atof(argv[++i]);
        } else if (!strcmp(argv[i], "--extension_timeframe")) {
            extension_timeframe = atof(argv[++i]);
        } else {
            log_messages.printf(MSG_CRITICAL, "unknown arg %s\n", argv[i]);
            return ERR_XML_PARSE;
        }
    }
    if (!extension_period) {
        log_messages.printf(MSG_CRITICAL, "missing --extension_period arg\n");
        return ERR_NULL;
    }
    if (!extension_timeframe) {
        log_messages.printf(MSG_CRITICAL, "missing --extension_timeframe arg\n");
        return ERR_NULL;
    }

    log_messages.printf(MSG_NORMAL,
        "extension_period: %f sec\n", extension_period
    );
    log_messages.printf(MSG_NORMAL,
        "extension_timeframe: %f sec\n", extension_timeframe
    );

    return 0;
}

int handle_trickle(MSG_FROM_HOST& mfh) {
    char task_name[256];
    char buf[256];
    int cpu_time = 0; // not needed but parsed to limit unexpected tag warnings

    //printf("got trickle-up \n%s\n\n", mfh.xml);

    MIOFILE mf;

    mf.init_buf_read(mfh.xml);
    XML_PARSER xp(&mf);

    while (!xp.get_tag()) {
        if (xp.parse_int("cpu_time", cpu_time)) break;
        if (xp.parse_str("result_name", task_name, 256)) break;
        log_messages.printf(MSG_NORMAL,
            "[HOST#%u] unexpected tag: %s\n",
            mfh.hostid, xp.parsed_tag
        );
    }
    if (strlen(task_name) == 0) {
        log_messages.printf(MSG_NORMAL,
            "[HOST#%u] unexpected empty result_name attribute\n",
            mfh.hostid
        );
        return ERR_XML_PARSE;
    }

    DB_RESULT task;
    sprintf(buf, " where name='%s' and hostid=%u", task_name, mfh.hostid);
    int retval = task.lookup(buf);
    if (retval) {
        log_messages.printf(MSG_CRITICAL,
            "[HOST#%u] error while looking for result_name: %s\n",
            mfh.hostid, task_name
        );
        return retval;
    }

    // sanity checks - customize as needed
    //
    if (task.report_deadline < dtime()) {
        log_messages.printf(MSG_NORMAL,
            "[RESULT#%u][HOST#%u] report deadline is in the past\n",
            task.id, mfh.hostid
        );
        // don't do anything for now (could reactivate the result here)
        return 0;
    }
    if ((task.report_deadline - extension_timeframe) > dtime()) {
        log_messages.printf(MSG_DEBUG,
            "[RESULT#%u][HOST#%u] report deadline is too far in the future\n",
            task.id, mfh.hostid
        );
        // don't do anything
        return 0;
    }
    // extend the deadline
    //
    task.report_deadline += extension_period;
    retval = task.update();
    if (retval) return retval;
    log_messages.printf(MSG_DEBUG,
        "[RESULT#%u][HOST#%u] report deadline extended to %d\n",
        task.id, mfh.hostid, task.report_deadline
    );
    return 0;
}