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#include <iostream>
#include <cstdlib>
#include "referee.h"
#include "params.h"
// Timeout in milliseconds for the feature negotiation at the start of the
// protocol. If the referee hasn't sent anything after this timeout, we assume
// the referee isn't capable of sending feature lines and will be treated as
// such for the duration of the competition.
#define FEATURE_TIMEOUT 200
Referee::Referee(const string_view execname, const vector<string> &players)
: proc(execname), refereeExecname(execname) {
proc.run();
if (referee_verbose) {
cout << "REF(" << proc.getPid() << ") starting for:";
for (const string &p : players) cout << " " << p;
cout << endl;
}
queryFeatures();
proc.writeLine(to_string(players.size()));
for (const string &p : players) {
proc.writeLine(p);
}
readWriteLines();
}
Referee::~Referee() {
if (referee_verbose) {
cout << "REF(" << proc.getPid() << ") stopping" << endl;
}
proc.wait();
proc.terminate();
}
bool Referee::moveValid(int player, const string_view line) {
string s = to_string(player) + " ";
s.append(line);
if (referee_verbose) {
cout << "REF(" << proc.getPid() << ") write <" << s << ">" << endl;
}
proc.writeLine(s);
optional<string> response = proc.readLine();
if (response) {
if (referee_verbose) {
cout << "REF(" << proc.getPid() << ") read <" << *response << ">" << endl;
}
bool result;
if (*response == "valid end") {
isEnd = true;
result = true;
} else if (*response == "valid") {
result = true;
} else if (*response == "invalid") {
result = false;
} else {
cout << "REF(" << proc.getPid() << ") Invalid validity judgement '" << *response << "'!" << endl;
exit(1);
}
readWriteLines();
if (isEnd) readScores();
return result;
} else {
cout << "REF(" << proc.getPid() << ") EOF!" << endl;
return false;
}
}
vector<pair<int, string>> Referee::playerWriteLines() {
return writeLinesList;
}
bool Referee::gameEnded() {
return isEnd;
}
void Referee::queryFeatures() {
bool first = true;
while (true) {
optional<string> line;
if (first) {
line = proc.readLineTimeout(FEATURE_TIMEOUT);
if (!line) {
cout << "Referee '" << refereeExecname << "' seems to follow the old protocol!" << endl;
return;
}
first = false;
} else {
line = proc.readLine();
}
if (!line) {
cout << "REF(" << proc.getPid() << ") EOF!" << endl;
exit(1);
}
if (referee_verbose) {
cout << "REF(" << proc.getPid() << ") read <" << *line << ">" << endl;
}
if (*line == "feature_end") {
return;
} else if (line->substr(0, 8) == "feature ") {
string featname = line->substr(8);
if (featname == "write_lines") features.writeLines = true;
else if (featname == "no_last_move") features.noLastMove = true;
else {
cerr << "REF(" << proc.getPid() << ") Referee requested unsupported feature '" << featname << "'" << endl;
exit(1);
}
} else {
cerr << "REF(" << proc.getPid() << ") Referee protocol violation in feature negotiation" << endl;
exit(1);
}
}
}
void Referee::readWriteLines() {
writeLinesList.clear();
if (!features.writeLines) return;
while (true) {
optional<string> line = proc.readLine();
if (!line) {
cout << "REF(" << proc.getPid() << ") EOF!" << endl;
break;
}
if (referee_verbose) {
cout << "REF(" << proc.getPid() << ") read <" << *line << ">" << endl;
}
if (line == "write_end") break;
size_t idx = line->find(' ');
if (idx == string::npos) {
cerr << "REF(" << proc.getPid() << ") Referee feature_write_lines protocol violation!" << endl;
exit(1);
}
int player = stoi(line->substr(0, idx));
writeLinesList.emplace_back(player, line->substr(idx + 1));
}
}
void Referee::readScores() {
optional<string> line = proc.readLine();
if (!line) {
cerr << "Referee stopped before providing scores" << endl;
exit(1);
}
size_t cursor = 0;
while (cursor < line->size()) {
size_t idx = line->find(' ', cursor);
if (idx == string::npos) idx = line->size();
scores.push_back(stoi(line->substr(cursor, idx - cursor)));
cursor = idx + 1;
}
}
optional<vector<int>> Referee::getScores() {
if (isEnd) return scores;
else return nullopt;
}
void Referee::terminate() {
proc.terminate();
}
const Features& Referee::getFeatures() const {
return features;
}
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