RequestQueue

// search_server_s3_t3_v3.cpp

#include <algorithm>
#include <cmath>
#include <iostream>
#include <map>
#include <set>
#include <stdexcept>
#include <string>
#include <utility>
#include <vector>
#include <stack>
#include <deque>

using namespace std;

const int MAX_RESULT_DOCUMENT_COUNT = 5;

string ReadLine() {
    string s;
    getline(cin, s);
    return s;
}

int ReadLineWithNumber() {
    int result;
    cin >> result;
    ReadLine();
    return result;
}

vector<string> SplitIntoWords(const string& text) {
    vector<string> words;
    string word;
    for (const char c : text) {
        if (c == ' ') {
            if (!word.empty()) {
                words.push_back(word);
                word.clear();
            }
        }
        else {
            word += c;
        }
    }
    if (!word.empty()) {
        words.push_back(word);
    }

    return words;
}

struct Document {
    Document() = default;

    Document(int id, double relevance, int rating)
        : id(id)
        , relevance(relevance)
        , rating(rating) {
    }

    int id = 0;
    double relevance = 0.0;
    int rating = 0;
};

template <typename StringContainer>
set<string> MakeUniqueNonEmptyStrings(const StringContainer& strings) {
    set<string> non_empty_strings;
    for (const string& str : strings) {
        if (!str.empty()) {
            non_empty_strings.insert(str);
        }
    }
    return non_empty_strings;
}

enum class DocumentStatus {
    ACTUAL,
    IRRELEVANT,
    BANNED,
    REMOVED,
};

class SearchServer {
public:
    template <typename StringContainer>
    explicit SearchServer(const StringContainer& stop_words)
        : stop_words_(MakeUniqueNonEmptyStrings(stop_words))  // Extract non-empty stop words
    {
        if (!all_of(stop_words_.begin(), stop_words_.end(), IsValidWord)) {
            throw invalid_argument("Some of stop words are invalid"s);
        }
    }

    explicit SearchServer(const string& stop_words_text)
        : SearchServer(SplitIntoWords(stop_words_text))  // Invoke delegating constructor from string container
    {
    }

    void AddDocument(int document_id, const string& document, DocumentStatus status, const vector<int>& ratings) {
        if ((document_id < 0) || (documents_.count(document_id) > 0)) {
            throw invalid_argument("Invalid document_id"s);
        }
        const auto words = SplitIntoWordsNoStop(document);

        const double inv_word_count = 1.0 / words.size();
        for (const string& word : words) {
            word_to_document_freqs_[word][document_id] += inv_word_count;
        }
        documents_.emplace(document_id, DocumentData{ ComputeAverageRating(ratings), status });
        document_ids_.push_back(document_id);
    }

    template <typename DocumentPredicate>
    vector<Document> FindTopDocuments(const string& raw_query, DocumentPredicate document_predicate) const {
        const auto query = ParseQuery(raw_query);

        auto matched_documents = FindAllDocuments(query, document_predicate);

        sort(matched_documents.begin(), matched_documents.end(), [](const Document& lhs, const Document& rhs) {
            if (abs(lhs.relevance - rhs.relevance) < 1e-6) {
                return lhs.rating > rhs.rating;
            }
            else {
                return lhs.relevance > rhs.relevance;
            }
            });
        if (matched_documents.size() > MAX_RESULT_DOCUMENT_COUNT) {
            matched_documents.resize(MAX_RESULT_DOCUMENT_COUNT);
        }

        return matched_documents;
    }

    vector<Document> FindTopDocuments(const string& raw_query, DocumentStatus status) const {
        return FindTopDocuments(raw_query, [status](int document_id, DocumentStatus document_status, int rating) {
            return document_status == status;
            });
    }

    vector<Document> FindTopDocuments(const string& raw_query) const {
        return FindTopDocuments(raw_query, DocumentStatus::ACTUAL);
    }

    int GetDocumentCount() const {
        return static_cast<int>(documents_.size());
    }

    int GetDocumentId(int index) const {
        return document_ids_.at(index);
    }

    tuple<vector<string>, DocumentStatus> MatchDocument(const string& raw_query, int document_id) const {
        const auto query = ParseQuery(raw_query);

        vector<string> matched_words;
        for (const string& word : query.plus_words) {
            if (word_to_document_freqs_.count(word) == 0) {
                continue;
            }
            if (word_to_document_freqs_.at(word).count(document_id)) {
                matched_words.push_back(word);
            }
        }
        for (const string& word : query.minus_words) {
            if (word_to_document_freqs_.count(word) == 0) {
                continue;
            }
            if (word_to_document_freqs_.at(word).count(document_id)) {
                matched_words.clear();
                break;
            }
        }
        return { matched_words, documents_.at(document_id).status };
    }

private:
    struct DocumentData {
        int rating;
        DocumentStatus status;
    };
    const set<string> stop_words_;
    map<string, map<int, double>> word_to_document_freqs_;
    map<int, DocumentData> documents_;
    vector<int> document_ids_;

    bool IsStopWord(const string& word) const {
        return stop_words_.count(word) > 0;
    }

    static bool IsValidWord(const string& word) {
        // A valid word must not contain special characters
        return none_of(word.begin(), word.end(), [](char c) {
            return c >= '\0' && c < ' ';
            });
    }

    vector<string> SplitIntoWordsNoStop(const string& text) const {
        vector<string> words;
        for (const string& word : SplitIntoWords(text)) {
            if (!IsValidWord(word)) {
                throw invalid_argument("Word "s + word + " is invalid"s);
            }
            if (!IsStopWord(word)) {
                words.push_back(word);
            }
        }
        return words;
    }

    static int ComputeAverageRating(const vector<int>& ratings) {
        if (ratings.empty()) {
            return 0;
        }
        int rating_sum = 0;
        for (const int rating : ratings) {
            rating_sum += rating;
        }
        return rating_sum / static_cast<int>(ratings.size());
    }

    struct QueryWord {
        string data;
        bool is_minus;
        bool is_stop;
    };

    QueryWord ParseQueryWord(const string& text) const {
        if (text.empty()) {
            throw invalid_argument("Query word is empty"s);
        }
        string word = text;
        bool is_minus = false;
        if (word[0] == '-') {
            is_minus = true;
            word = word.substr(1);
        }
        if (word.empty() || word[0] == '-' || !IsValidWord(word)) {
            throw invalid_argument("Query word "s + text + " is invalid");
        }

        return { word, is_minus, IsStopWord(word) };
    }

    struct Query {
        set<string> plus_words;
        set<string> minus_words;
    };

    Query ParseQuery(const string& text) const {
        Query result;
        for (const string& word : SplitIntoWords(text)) {
            const auto query_word = ParseQueryWord(word);
            if (!query_word.is_stop) {
                if (query_word.is_minus) {
                    result.minus_words.insert(query_word.data);
                }
                else {
                    result.plus_words.insert(query_word.data);
                }
            }
        }
        return result;
    }

    // Existence required
    double ComputeWordInverseDocumentFreq(const string& word) const {
        return log(GetDocumentCount() * 1.0 / word_to_document_freqs_.at(word).size());
    }

    template <typename DocumentPredicate>
    vector<Document> FindAllDocuments(const Query& query, DocumentPredicate document_predicate) const {
        map<int, double> document_to_relevance;
        for (const string& word : query.plus_words) {
            if (word_to_document_freqs_.count(word) == 0) {
                continue;
            }
            const double inverse_document_freq = ComputeWordInverseDocumentFreq(word);
            for (const auto [document_id, term_freq] : word_to_document_freqs_.at(word)) {
                const auto& document_data = documents_.at(document_id);
                if (document_predicate(document_id, document_data.status, document_data.rating)) {
                    document_to_relevance[document_id] += term_freq * inverse_document_freq;
                }
            }
        }

        for (const string& word : query.minus_words) {
            if (word_to_document_freqs_.count(word) == 0) {
                continue;
            }
            for (const auto [document_id, _] : word_to_document_freqs_.at(word)) {
                document_to_relevance.erase(document_id);
            }
        }

        vector<Document> matched_documents;
        for (const auto [document_id, relevance] : document_to_relevance) {
            matched_documents.push_back({ document_id, relevance, documents_.at(document_id).rating });
        }
        return matched_documents;
    }
};


template <typename It>
class IteratorRange {
public:
    IteratorRange(It start, It end) : start_(start), end_(end) {}

    It begin() const {
        return start_;
    }

    It end() const {
        return end_;
    }

    int size() const {
        return static_cast<int>(distance(start_, end_));
    }
private:
    It start_;
    It end_;
};

template <typename It>
class Paginator {
public:
    Paginator(It start, It end, size_t page_size) {
        while (start <= end - 1) {
            if (start + page_size >= end) {
                It tmp_start = start;
                advance(start, distance(start, end));
                pages_.push_back(IteratorRange<It>(tmp_start, end));
                return;
            }
            pages_.push_back(IteratorRange<It>(start, start + page_size));
            advance(start, distance(start, start + page_size));
        }
    }

    auto begin() const {
        return pages_.begin();
    }

    auto end() const {
        return pages_.end();
    }
private:
    vector<IteratorRange<It>> pages_;
};

ostream& operator<<(ostream& os, const Document document) {
    os << "{ "s
        << "document_id = "s << document.id << ", "s
        << "relevance = "s << document.relevance << ", "s
        << "rating = "s << document.rating
        << " }"s;
    return os;
}

template <typename It>
ostream& operator<<(ostream& os, const IteratorRange<It> ir) {
    for (auto i = ir.begin(); i != ir.end(); ++i) {
        os << *i;
    }
    return os;
}


template <typename Container>
auto Paginate(const Container& c, size_t page_size) {
    return Paginator(begin(c), end(c), page_size);
}

class RequestQueue {
public:
    explicit RequestQueue(const SearchServer& search_server)
        : srv(search_server) {
        ;
    }
    // сделаем "обёртки" для всех методов поиска, чтобы сохранять результаты для нашей статистики
    template <typename DocumentPredicate>
    vector<Document> AddFindRequest(const string& raw_query, DocumentPredicate document_predicate) {
        // напишите реализацию
        auto resultVector = srv.FindTopDocuments(raw_query, document_predicate);

        AnswerToRequest_(resultVector, raw_query);

        return resultVector;
    }

    vector<Document> AddFindRequest(const string& raw_query, DocumentStatus status) {
        // напишите реализацию
        auto resultVector = srv.FindTopDocuments(raw_query, status);
        AnswerToRequest_(resultVector, raw_query);

        return resultVector;

    }

    vector<Document> AddFindRequest(const string& raw_query) {
        // напишите реализацию
        auto resultVector = srv.FindTopDocuments(raw_query);
        AnswerToRequest_(resultVector, raw_query);

        return resultVector;
    }

    int GetNoResultRequests() const {
        //return count_requests_;

        return count_if(requests_.begin(), requests_.end(), [](const QueryResult& a) {
            if (a.result_count_ == 0) {
                return true;
            }
            return false;
            ; });;
    }
private:
    struct QueryResult {
        // определите, что должно быть в структуре
        string request = "";
        int result_count_ = 0;
    };
    deque<QueryResult> requests_;
    const static int min_in_day_ = 1440;
    //int count_requests_ = 0;
    const SearchServer& srv;

    template<typename Type>
    void AnswerToRequest_(const Type& type, const string& str) {
        QueryResult query;

        if (type.empty()) {
            query.result_count_ = 0;
        }
        else {
            ++query.result_count_;
        }

        query.request = str;
        requests_.push_back(query);

        if (requests_.size() > min_in_day_) {
            requests_.pop_front();
        }

    }
};


int main() {
    SearchServer search_server("and in at"s);
    RequestQueue request_queue(search_server);

    search_server.AddDocument(1, "curly cat curly tail"s, DocumentStatus::ACTUAL, { 7, 2, 7 });
    search_server.AddDocument(2, "curly dog and fancy collar"s, DocumentStatus::ACTUAL, { 1, 2, 3 });
    search_server.AddDocument(3, "big cat fancy collar "s, DocumentStatus::ACTUAL, { 1, 2, 8 });
    search_server.AddDocument(4, "big dog sparrow Eugene"s, DocumentStatus::ACTUAL, { 1, 3, 2 });
    search_server.AddDocument(5, "big dog sparrow Vasiliy"s, DocumentStatus::ACTUAL, { 1, 1, 1 });

    // 1439 запросов с нулевым результатом
    for (int i = 0; i < 1439; ++i) {
        request_queue.AddFindRequest("empty request"s);
    }
    // все еще 1439 запросов с нулевым результатом
    request_queue.AddFindRequest("curly dog"s);
    // новые сутки, первый запрос удален, 1438 запросов с нулевым результатом

    request_queue.AddFindRequest("big collar"s);
    // первый запрос удален, 1437 запросов с нулевым результатом
    request_queue.AddFindRequest("sparrow"s);
    cout << "Total empty requests: "s << request_queue.GetNoResultRequests() << endl;
    return 0;
}