//
// Created by stas on 5/5/19.
//

#include "database.h"


ostream& operator<< (ostream& os, const pair<Date, string>& unit) {
    return os << unit.first << " " << unit.second;
}

void Database::Add(const Date& date, const string& event) {
    if(database_.count(date) > 0) {
        const set<string>& events = database_[date].second;
        if (events.count(event) != 0)
            return;
    }
    database_[date].first.push_back(event);
    database_[date].second.insert(event);
}

void Database::Print(ostream& os) const {
    for (const auto& c : database_) {
        const Date& date = c.first;
        const vector<string>& events = c.second.first;
        for (const string &event : events)
            os << date << " " << event << endl;
    }
}

pair<Date, string> Database::Last(const Date& date) const {
    auto p = database_.upper_bound(date);
    if (p == database_.begin())
        throw invalid_argument("RAWR");
    else
        return pair{prev(p)->first, *(prev(p)->second.first.rbegin())};
}