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package com.ufund.api.ufundapi.persistence;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.ufund.api.ufundapi.model.Need;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import java.io.File;
import java.io.IOException;
import java.util.Map;
import java.util.TreeMap;
@Component
public class CupboardFileDAO implements CupboardDAO {
private final Map<Integer, Need> needs; // cache
private final ObjectMapper objectMapper;
private static int nextId;
private final String filename;
public CupboardFileDAO(@Value("${cupboard.file}") String filename, ObjectMapper objectMapper) throws IOException {
this.filename = filename;
this.objectMapper = objectMapper;
needs = new TreeMap<>();
load();
}
private synchronized static int nextId() {
int id = nextId;
nextId++;
return id;
}
/**
* Load changes from the json file
*
* @throws IOException Any IO issue with the file
*/
private void load() throws IOException {
needs.clear();
nextId = 0;
Need[] needsArray = objectMapper.readValue(new File(filename), Need[].class);
for (Need need : needsArray) {
needs.put(need.getId(), need);
if (need.getId() > nextId()) {
nextId = need.getId();
}
}
nextId++;
}
/**
* Return an array of the needs
*
* @return An array of all the needs
*/
private Need[] getNeedsArray() {
return needs.values().toArray(Need[]::new);
}
/**
* Saves the needs to json
*
* @return True if the save was successful, false otherwise
* @throws IOException If there was an IO issue saving the file
*/
private boolean save() throws IOException {
Need[] needArray = getNeedsArray();
objectMapper.writeValue(new File(filename), needArray);
return true;
}
@Override
public Need[] getNeeds() {
synchronized (needs) {
return getNeedsArray();
}
}
@Override
public Need getNeed(int id) {
synchronized (needs) {
return needs.getOrDefault(id, null);
}
}
@Override
public Need addNeed(Need need) throws IOException {
synchronized (needs) {
Need newNeed = new Need(need);
newNeed.setID(nextId());
needs.put(newNeed.getId(), newNeed);
save();
return newNeed;
}
}
@Override
public Need updateNeed(Need need) throws IOException {
synchronized (needs) {
if (needs.containsKey(need.getId())) {
needs.put(need.getId(), need);
save();
return need;
} else {
return null;
}
}
}
@Override
public boolean deleteNeed(int id) throws IOException {
synchronized (needs) {
if (needs.containsKey(id)) {
needs.remove(id);
return save();
} else {
return false;
}
}
}
}
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