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#include "labeller.h"
#include "settings.h"
#include <fstream>
#include <iostream>
namespace backend {
struct labeller_impl {
std::vector<std::string> labels;
std::vector<label> annotations;
// Bool in undo/redo buffers is whether was applied or deleted
std::vector<std::pair<bool, label>> undoBuffer;
std::vector<std::pair<bool, label>> redoBuffer;
std::filesystem::path savepath;
};
void load(const std::filesystem::path& savepath, labeller_impl& data) {
std::ifstream in(savepath);
std::string line;
const char delim = ',';
while(std::getline(in, line)) {
std::size_t split = line.find(delim);
if(split == std::string::npos) {
std::cerr << "Error reading " << savepath << std::endl;
throw std::runtime_error(savepath.string());
}
data.annotations.push_back(label(line.substr(0, split), std::stod(line.substr(split+1))));
}
}
labeller::labeller(const std::filesystem::path& savepath) {
data = std::shared_ptr<labeller_impl>(new labeller_impl);
data->labels = settings::getLabels();
data->savepath = savepath;
if(std::filesystem::directory_entry(savepath).exists()) {
load(savepath, *data);
}
}
std::pair<label, label> labeller::getSurrounding(double time) const {
std::pair<label, label> labs;
if(!data->annotations.empty()) {
auto above = data->annotations.rbegin();
auto below = above;
auto rit = above;
while(++rit != data->annotations.rend()) {
if(rit->time > time && (above->time <= time || rit->time < above->time)) above = rit;
if(rit->time <= time && (below->time > time || rit->time > below->time)) below = rit;
}
if(below->time <= time) labs.first = *below;
if(above->time > time) labs.second = *above;
}
return labs;
}
std::vector<std::string> labeller::getLabels() const {
return data->labels;
}
void appLab(std::vector<label>& annotations, label lab) {
annotations.push_back(lab);
}
void labeller::applyLabel(std::string name, double time) {
label lab(name, time);
appLab(data->annotations, lab);
data->undoBuffer.push_back({true, lab});
data->redoBuffer.clear();
}
double abs(double x) {
if(x < 0) x *= -1;
return x;
}
label delLab(std::vector<label>& annotations, double time) {
if(annotations.empty()) {
return label();
}
auto closest = annotations.rbegin();
auto rit = closest;
while(++rit != annotations.rend()) {
if(abs(rit->time - time) < abs(closest->time - time)) {
closest = rit;
}
}
label c(*closest);
annotations.erase(closest.base());
return c;
}
void labeller::deleteLabel(double time) {
label deleted = delLab(data->annotations, time);
data->undoBuffer.push_back({false, deleted});
data->redoBuffer.clear();
}
// Pops action from 'from', applies, and appends to 'to'.
void handleUndoRedo(std::vector<std::pair<bool, label>>& from, std::vector<std::pair<bool, label>>& to, std::vector<label>& annotations) {
if(! from.empty()) {
auto elem = from.back();
from.pop_back();
if(elem.first) { // It was applied, so we must unapply
delLab(annotations, elem.second.time);
} else {
appLab(annotations, elem.second);
}
to.push_back({! elem.first, elem.second});
}
}
void labeller::undo() {
handleUndoRedo(data->undoBuffer, data->redoBuffer, data->annotations);
}
void labeller::redo() {
handleUndoRedo(data->redoBuffer, data->undoBuffer, data->annotations);
}
bool compareLabels(label l1, label l2) {
return (l1.time < l2.time);
}
void labeller::save() const {
std::ofstream out;
std::filesystem::create_directories(data->savepath.parent_path());
out.open(data->savepath);
std::vector<label> a(data->annotations);
std::sort(a.begin(), a.end(), compareLabels);
for(label l : a) {
out << l.name << "," << l.time << std::endl;
}
out.close();
}
}
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