/*
The MIT License (MIT)

Copyright © 2020-2025 pacman64

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the “Software”), to deal
in the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

/*
You can build this command-line app by running

g++ -Wall -O2 -s -o bully bully.cpp
*/

#include <algorithm>
#include <cstdint>
#include <cstring>
#include <fstream>
#include <iostream>
#include <map>
#include <new>
#include <string>
#include <vector>

using namespace std;

const string info = ""
"bully [files...]\n"
"\n"
"Tally/count each distinct line, also emitting bullet points. The output is\n"
" a TSV table, with headers.\n"
"";

typedef map<string, uint64_t> string_tally;

void handle_input(istream& in, string& line, string_tally& tally) {
    while (getline(in, line)) {
        tally[line]++;
    }
}

bool handle_file(const char* path, string& line, string_tally& tally) {
    ifstream f(path);
    if (f.is_open()) {
        handle_input(f, line, tally);
        return true;
    }

    cerr << "\x1b[31mcan't open file named '" << path << "'\x1b[0m" << endl;
    return false;
}

// run returns the number of errors
int run(int argc, char** argv) {
    string line;
    string_tally tally;

    if (argc > 1) {
        if (
            strcmp(argv[1], "-h") == 0 ||
            strcmp(argv[1], "-help") == 0 ||
            strcmp(argv[1], "--h") == 0 ||
            strcmp(argv[1], "--help") == 0
        ) {
            cout << info;
            return 0;
        }
    }

    size_t dashes = 0;
    for (int i = 1; i < argc; i++) {
        if (argv[i][0] == '-' && argv[i][1] == 0) {
            dashes++;
        }
    }

    if (dashes > 1) {
        cerr << "\x1b[31mcan't use dash (stdin) more than once\x1b[0m" << endl;
        return 1;
    }

    cin.tie(NULL);
    ios_base::sync_with_stdio(false);

    cout << "value\ttally\tbullets" << endl;

    size_t errors = 0;
    for (int i = 1; i < argc; i++) {
        if (argv[i][0] == '-' && argv[i][1] == 0) {
            handle_input(cin, line, tally);
            continue;
        }

        if (!handle_file(argv[i], line, tally)) {
            errors++;
        }
    }

    if (argc < 2) {
        handle_input(cin, line, tally);
    }

    vector<string> sorted;
    sorted.reserve(tally.size());
    for (auto kv = tally.begin(); kv != tally.end(); kv++) {
        sorted.push_back(kv->first);
    }

    sort(sorted.begin(), sorted.end(), [&tally](const auto& x, const auto& y) {
        auto a = tally[x];
        auto b = tally[y];
        if (a > b) {
            return true;
        }
        return x < y;
    });

    for (const auto& k : sorted) {
        auto n = tally[k];
        cout << k << '\t' << n << '\t';
        while (n > 0) {
            // cout << "●";
            cout << "•";
            n--;
        }
        cout << endl;

        if (cout.eof()) {
            break;
        }
    }

    return errors;
}

int main(int argc, char** argv) {
    try {
        return run(argc, argv) == 0 ? 0 : 1;
    } catch (const bad_alloc& e) {
        cerr << "\x1b[31mout of memory\x1b[0m" << endl;
        return 1;
    }
}