// This file is part of BOINC.
// http://boinc.berkeley.edu
// Copyright (C) 2008 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/>.

#include "cpp.h"
#ifdef _WIN32
#include "boinc_win.h"
#else
#include "config.h"
#endif

#include <cstring>
#include "error_numbers.h"
#include "file_names.h"
#include "filesys.h"
#include "parse.h"
#include "util.h"
#include "str_util.h"
#include "sandbox.h"
#include "client_state.h"

using std::string;

// Scan project dir for file names of the form trickle_up_X_Y
// where X is a result name and Y is a timestamp.
// Convert them to XML (for sched request message)
//
int CLIENT_STATE::read_trickle_files(PROJECT* project, FILE* f) {
    char project_dir[256], *p, *q, result_name[256], fname[256];
    char* file_contents, path[256], newpath[256];
    string fn;
    time_t t;
    int retval;

    get_project_dir(project, project_dir, sizeof(project_dir));
    DirScanner ds(project_dir);

    // trickle-up filenames are of the form trickle_up_RESULTNAME_TIME[.sent]
    //
    while (ds.scan(fn)) {
        strcpy(fname, fn.c_str());
        if (strstr(fname, "trickle_up_") != fname) continue;
        q = fname + strlen("trickle_up_");
        p = strrchr(fname, '_');
        if (p <= q) continue;
        *p = 0;
        strcpy(result_name, q);
        *p = '_';
        t = atoi(p+1);

        sprintf(path, "%s/%s", project_dir, fname);
        retval = read_file_malloc(path, file_contents);
        if (retval) continue;
        fprintf(f,
            "  <msg_from_host>\n"
            "      <result_name>%s</result_name>\n"
            "      <time>%d</time>\n"
            "%s\n"
            "  </msg_from_host>\n",
            result_name,
            (int)t,
            file_contents
        );
        free(file_contents);

        // append .sent to filename, so we'll know which ones to delete later
        //
        if (!ends_with(fname, ".sent")) {
            sprintf(newpath, "%s/%s.sent", project_dir, fname);
            boinc_rename(path, newpath);
        }
    }
    return 0;
}

// Remove files when ack has been received.
// Remove only those ending with ".sent"
// (others arrived from application while RPC was happening)
//
int CLIENT_STATE::remove_trickle_files(PROJECT* project) {
    char project_dir[256], path[256], fname[256];
    string fn;

    get_project_dir(project, project_dir, sizeof(project_dir));
    DirScanner ds(project_dir);

    while (ds.scan(fn)) {
        strcpy(fname, fn.c_str());
        if (!starts_with(fname, "trickle_up")) continue;
        if (!ends_with(fname, ".sent")) continue;
        sprintf(path, "%s/%s", project_dir, fname);
        delete_project_owned_file(path, true);
    }
    return 0;
}

// parse a trickle-down message in a scheduler reply.
// Locate the corresponding active task,
// write a file in the slot directory,
// and notify the task
//
int CLIENT_STATE::handle_trickle_down(PROJECT* project, FILE* in) {
    char buf[256];
    char result_name[256], path[256];
    string body;
    int send_time=0;

    strcpy(result_name, "");
    while (fgets(buf, 256, in)) {
        if (match_tag(buf, "</trickle_down>")) {
            RESULT* rp = lookup_result(project, result_name);
            if (!rp) return ERR_NULL;
            ACTIVE_TASK* atp = lookup_active_task_by_result(rp);
            if (!atp) return ERR_NULL;
            sprintf(path, "%s/trickle_down_%d", atp->slot_dir, send_time);
            FILE* f = fopen(path, "w");
            if (!f) return ERR_FOPEN;
            fputs(body.c_str(), f);
            fclose(f);
            atp->have_trickle_down = true;
            return 0;
        } else if (parse_str(buf, "<result_name>", result_name, 256)) {
            continue;
        } else if (parse_int(buf, "<time>", send_time)) {
            continue;
        } else {
            body += buf;
        }
    }
    return ERR_XML_PARSE;
}

const char *BOINC_RCSID_acbefbad3d = "$Id: cs_trickle.cpp 16128 2008-10-04 16:00:28Z davea $";
