package com.camilstaps.common;

import org.json.JSONException;
import org.json.JSONObject;

import java.lang.reflect.InvocationTargetException;
import java.text.ParseException;

/**
 * DatedString: a Date - String pair
 * @author Camil Staps
 */
public class DatedString {

    protected final Date date;
    protected final String string;

    public DatedString(Date date, String string) {
        this.date = date;
        this.string = string;
    }

    public String getString() {
        return string;
    }

    public Date getDate() {
        return date;
    }

    /**
     * JSON-encode the pair so that it can be stored in SharedPreferences, for example
     * @return
     */
    @Override
    public String toString() {
        JSONObject json = new JSONObject();
        try {
            json.put("date", date.toString());
            json.put("text", string);
        } catch (JSONException e) {}
        return json.toString();
    }

    /**
     * JSON-decode some encoded pair
     * @param s the String to decode
     * @param castTo the specific class to cast to (may be DatedString or one of its children)
     * @return
     * @throws JSONException if the String was no valid JSON
     * @throws ParseException if the date in the JSON was no valid Date
     */
    public static Object fromString(String s, Class castTo) throws JSONException, ParseException {
        JSONObject json = new JSONObject(s);
        try {
            return castTo.cast(castTo.getDeclaredConstructor(Date.class, String.class).newInstance(new Date(json.getString("date")), json.getString("text")));
        } catch (InstantiationException e) {
            return null;
        } catch (IllegalAccessException e) {
            return null;
        } catch (InvocationTargetException e) {
            return null;
        } catch (NoSuchMethodException e) {
            return null;
        }
    }

}