#include <cstdio>
#include <iterator>

#include "LocalFileReader.h"
#include "Exception.h"

LocalFileReader LocalFileReader::instance(protocol);

void LocalFileReader::open(const std::string url) {
	std::string path = url;
	if (path.starts_with(protocol))
		path = path.substr(protocol.size());

	this->file = new std::ifstream(path, std::ios::in);
	if (this->file->fail() || !this->file->is_open())
		throw Exception("cannot open file://%s\n", path.c_str());
}

void LocalFileReader::close() {
	if (this->file == nullptr) return;

	if (this->file->is_open())
		this->file->close();
}

const std::string LocalFileReader::read() {
	if (this->content != nullptr)
		return *this->content;

	if (this->file == nullptr)
		throw Exception("FileReader read after destructor\n");

	if (!this->file->is_open())
		throw Exception("FileReader read after close\n");

	this->content = new std::string(
		std::istreambuf_iterator<char>(*this->file),
		std::istreambuf_iterator<char>()
	);

	return *this->content;
}

LocalFileReader::~LocalFileReader() {
	this->close();

	if (this->file != nullptr) {
		delete this->file;
		this->file = nullptr;
	}

	if (this->content != nullptr) {
		delete this->content;
		this->content = nullptr;
	}
}

LocalFileReader * LocalFileReader::clone() const {
	return new LocalFileReader(this);
}

LocalFileReader::LocalFileReader(const LocalFileReader *) : FileReader() { }