#include <cstdio>
#include <cstring>

#include "utils/String.h"

String::String() : String("") {
}

String::String(const char* str) : usedCapacity(1) {
    *this += str;
}

String& String::operator+=(const char* str) {
    usedCapacity--;
    size_t start = usedCapacity;
    while(usedCapacity + 1 < capacity && str[usedCapacity - start] != '\0') {
        data[usedCapacity] = str[usedCapacity - start];
        usedCapacity++;
    }
    data[usedCapacity++] = '\0';
    return *this;
}

String& String::operator+=(char c) {
    if(usedCapacity + 1 < capacity) {
        data[usedCapacity - 1] = c;
        data[usedCapacity] = '\0';
        usedCapacity++;
    }
    return *this;
}

String& String::operator+=(char32_t c) {
    if(c <= 0x7F) {
        *this += (char) c;
    } else if(c <= 0x7FF) {
        *this += (char) (0xC0 | ((c >> 6) & 0x1F));
        *this += (char) (0x80 | ((c >> 0) & 0x3F));
    } else if(c <= 0xFFFF) {
        *this += (char) (0xE0 | ((c >> 12) & 0xF));
        *this += (char) (0x80 | ((c >> 6) & 0x3F));
        *this += (char) (0x80 | ((c >> 0) & 0x3F));
    } else {
        *this += (char) (0xF0 | ((c >> 18) & 0x7));
        *this += (char) (0x80 | ((c >> 12) & 0x3F));
        *this += (char) (0x80 | ((c >> 6) & 0x3F));
        *this += (char) (0x80 | ((c >> 0) & 0x3F));
    }
    return *this;
}

String& String::operator+=(unsigned int i) {
    usedCapacity += snprintf(data + usedCapacity - 1, capacity - usedCapacity, "%u", i);
    return *this;
}

String& String::operator+=(double d) {
    usedCapacity += snprintf(data + usedCapacity - 1, capacity - usedCapacity, (d == (long) d) ? "%lg.0" : "%lg", d);
    return *this;
}

String String::operator+(const char* str) const {
    String s(this->data);
    s += str;
    return s;
}

String::operator const char*() const {
    return data;
}

size_t String::getLength() const {
    return usedCapacity - 1;
}

bool String::isFull() const {
    return usedCapacity >= capacity;
}

bool String::operator==(const String& other) const {
    return usedCapacity == other.usedCapacity && *this == other.data;
}

bool String::operator!=(const String& other) const {
    return !(*this == other);
}

bool String::operator==(const char* other) const {
    return strcmp(data, other) == 0;
}

bool String::operator!=(const char* other) const {
    return !(*this == other);
}