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#include <fstream>
#include <history.h>

namespace newsbeuter {

history::history() : idx(0) { }

history::~history() { }

void history::add_line(const std::string& line) {
/*
* When a line is added, we need to do so and
* reset the index so that the next prev/next
* operations start from the beginning again.
*/
if (line.length() > 0) {
lines.insert(lines.begin(), line);
}
idx = 0;
}

std::string history::prev() {
if (idx < lines.size()) {
return lines[idx++];
}
if (lines.size() == 0) {
return "";
}
return lines[idx-1];
}

std::string history::next() {
if (idx > 0) {
return lines[--idx];
}
return "";
}

void history::load_from_file(const std::string& file) {
std::fstream f;
f.open(file.c_str(), std::fstream::in);
if (f.is_open()) {
std::string line;
do {
getline(f, line);
if (!f.eof() && line.length() > 0) {
add_line(line);
}
} while (!f.eof());
}
}

void history::save_to_file(const std::string& file, unsigned int limit) {
std::fstream f;
f.open(file.c_str(), std::fstream::out | std::fstream::trunc);
if (f.is_open()) {
if (limit > lines.size())
limit = lines.size();
if (limit > 0) {
for (unsigned int i=limit-1;i>0;i--) {
f << lines[i] << std::endl;
}
f << lines[0] << std::endl;
}
}
}


}
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