#include "say.h"

#include <unordered_map>

#include <iostream>

namespace say {

using namespace std;

namespace {

const unordered_map<number_t, string> numbers_map = {
        {0, "zero"},
        {1, "one"},
        {2, "two"},
        {3, "three"},
        {4, "four"},
        {5, "five"},
        {6, "six"},
        {7, "seven"},
        {8, "eight"},
        {9, "nine"},
        {10, "ten"},
        {11, "eleven"},
        {12, "twelve"},
        {13, "thirteen"},
        {20, "twenty"},
        {30, "thirty"},
        {50, "fifty"},
        {80, "eighty"}
    };
}


string in_english(number_t number)
{
    if (number > 13 && number < 20)
        return numbers_map.at(number - 10) + "teen";

    if (number >= 20 && number < 100 && (number % 10 == 0)) {

        if (numbers_map.count(number))
            return numbers_map.at(number);

        return numbers_map.at(number / 10) + "ty";
    }

    if (number > 20 && number < 100) {

        number_t ones = number % 10;
        number_t tens = number - ones;

        return in_english(tens) + '-' + in_english(ones);
    }

    if (number >= 100 && number < 1000) {

        if (number % 100 == 0)
            return in_english(number / 100) + " hundred";

        number_t rest     = number % 100;
        number_t hundreds = number - rest;

        return in_english(hundreds) + ' ' + in_english(rest);
    }

    if (number >= 1000 && number < 1000000) {

        cout << number << endl;

        if (number % 1000 == 0)
            return in_english(number / 1000) + " thousand";

        number_t rest      = number % 1000;
        number_t thousands = number - rest;

        return in_english(thousands) + ' ' + in_english(rest);
    }

    return numbers_map.at(number);
}


}