/*
 * params.cpp
 *
 *  Created on: Oct 3, 2010
 *      Author: Michael J. Fischer
 *      for use in Yale course CPSC 427a, Fall 2010
 */

#include "params.hpp"
#include <errno.h>

// Convert argument string to int and check for error conditions
bool Params::parseToInt( const char* s, int& value ) {
    char* endptr;
    errno = 0;
    value = strtol(s, &endptr, 0);

    // Make sure all is okay
    return errno==0 && endptr!=s && *endptr=='\0';
}

Params::Params(int argc, char* argv[]) :
    alg(fickleAlg), numPlayers(10), numTrials(100),
            seed(time(0)) {

    // Extract command name from full path name provided by some shells
    char* slash = strrchr(argv[0], '/');
    char* prog = slash == NULL ? argv[0] : slash + 1;

    // Parse command arguments
    bool parseError = false;
    // Get algorithm name
    if (argc>1) {
        if (strcmp(argv[1],"fickle")==0) {
            alg = fickleAlg;
        }
        else if (strcmp(argv[1],"crowd")==0) {
            alg = crowdAlg;
        }
        else parseError = true;
    }
    // Get number of players
    if (argc>2) {
        parseError = parseError || !parseToInt(argv[2], numPlayers) || numPlayers <= 1;
    }
    // Get number of trials
    if (argc>3) {
        parseError = parseError || !parseToInt(argv[3], numTrials) || numTrials <= 0;
    }
    // Get starting seed for random number generator
    if (argc>4) {
        parseError = parseError || !parseToInt(argv[4], (int&)seed);
    }

    if (parseError || argc > 5) {
        cout << "usage: " << prog << " [algName [numPlayers [numTrials [seed]]]]]"
                << endl;
        exit(1);
    }
}

ostream& Params::print(ostream& out) const {
    out << "[Params:\n";
    out << "  algorithm=" << ((alg==fickleAlg) ? "fickle" : "crowd") << endl;
    out << "  numPlayers=" << numPlayers << "\n";
    out << "  numTrials=" << numTrials << "\n";
    out << "  seed=" << seed << "\n";
    out << "End Params]" << endl;
    return out;
}