#include "io/FileReader.h"

#include <stdio.h>

#include "utils/Logger.h"

Core::FileReader::FileReader() : file(nullptr) {
}

Core::FileReader::FileReader(FileReader&& other) : FileReader() {
    swap(other);
}

Core::FileReader::~FileReader() {
    if(file != nullptr) {
        int r = fclose(static_cast<FILE*>(file));
        if(r != 0) {
            CORE_LOG_WARNING("Cannot close file #: #", path, r);
        }
        file = nullptr;
    }
}

Core::FileReader& Core::FileReader::operator=(FileReader&& other) {
    swap(other);
    return *this;
}

const Core::Path& Core::FileReader::getPath() const {
    return path;
}

Core::Error Core::FileReader::open(const Path& p) {
    if(file != nullptr) {
        return Error::INVALID_STATE;
    }
    path = p;
    file = fopen(path, "rb");
    return file != nullptr ? Error::NONE : Error::CANNOT_OPEN_FILE;
}

Core::Error Core::FileReader::open(const char* p) {
    if(file != nullptr) {
        return Error::INVALID_STATE;
    }
    CORE_RETURN_ERROR(path.append(p));
    file = fopen(path, "rb");
    return file != nullptr ? Error::NONE : Error::CANNOT_OPEN_FILE;
}

Core::Error Core::FileReader::readChar(int& c) {
    if(file == nullptr) {
        return Error::INVALID_STATE;
    }
    c = fgetc(static_cast<FILE*>(file));
    return c == EOF ? Error::END_OF_FILE : Error::NONE;
}

Core::Error Core::FileReader::readChars(char* buffer, int bufferSize) {
    if(file == nullptr) {
        return Error::INVALID_STATE;
    } else if(bufferSize <= 0) {
        return Error::INVALID_ARGUMENT;
    }
    size_t size = static_cast<size_t>(bufferSize - 1);
    size_t readBytes = fread(buffer, 1, size, static_cast<FILE*>(file));
    buffer[readBytes] = '\0';
    return readBytes != size ? Error::END_OF_FILE : Error::NONE;
}

void Core::FileReader::swap(FileReader& other) {
    Core::swap(file, other.file);
    Core::swap(path, other.path);
}