#include "TextUtility.h"
#include <string>
#include <cctype>

std::string TextUtility::capitalize(const std::string &str) {
    std::string ret;
    bool nex = false;
    auto it = str.begin();
    ret.push_back(std::toupper(*it));
    it++;
    while (it != str.end()) {
        if (nex) {
            ret.push_back(std::toupper(*it));
            nex = false;
        } else {
            ret.push_back(*it);
        }
        if ('.' == *it || '!' == *it || '?' == *it) nex = true;
        it++;
    }
    return ret;
}

std::string TextUtility::toUpperCase(const std::string &str) {
    std::string ret;
    auto it = str.begin();
    while (it != str.end()) {
        ret.push_back(std::toupper(*it));
        it++;
    }
    return ret;
}

bool TextUtility::isNumeric(const std::string &str) {
    auto it = str.begin();
    while (it != str.end() && std::isdigit(*it)) ++it;
    return !str.empty() && it == str.end();
}

int TextUtility::contains(const std::string &str, const std::string &substr) {
    std::size_t found = str.find(substr);
    if (found != std::string::npos) return found;
    return -1;
}

std::string TextUtility::addSpaces(const std::string &str) {
    std::string ret;
    auto it = str.begin();
    while (it != str.end()) {
        ret.push_back(*it);
        ret.push_back(' ');
        it++;
    }
    return ret;
}

std::string TextUtility::removeDuplicatedSpaces(const std::string &str) {
    std::string ret;
    bool next = false;
    auto it = str.begin();
    while (it != str.end()) {
        if (next) {
            if(*it != ' ') {
                ret.push_back(*it);
            }
            next = false;
        } else {
            ret.push_back(*it);
        }
        if (*it == ' ') next = true;
        it++;
    }
    return ret;
}