package org.asamk.signal.util;

import com.fasterxml.jackson.databind.JsonNode;

import java.io.InvalidObjectException;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.HashMap;
import java.util.Map;

public class Util {

    private Util() {
    }

    public static String formatSafetyNumber(String digits) {
        final int partCount = 12;
        int partSize = digits.length() / partCount;
        StringBuilder f = new StringBuilder(digits.length() + partCount);
        for (int i = 0; i < partCount; i++) {
            f.append(digits, i * partSize, (i * partSize) + partSize).append(" ");
        }
        return f.toString();
    }

    public static Map<String, String> getQueryMap(String query) {
        String[] params = query.split("&");
        Map<String, String> map = new HashMap<>();
        for (String param : params) {
            String name = null;
            final String[] paramParts = param.split("=");
            try {
                name = URLDecoder.decode(paramParts[0], "utf-8");
            } catch (UnsupportedEncodingException e) {
                // Impossible
            }
            String value = null;
            try {
                value = URLDecoder.decode(paramParts[1], "utf-8");
            } catch (UnsupportedEncodingException e) {
                // Impossible
            }
            map.put(name, value);
        }
        return map;
    }

    public static String join(CharSequence separator, Iterable<? extends CharSequence> list) {
        StringBuilder buf = new StringBuilder();
        for (CharSequence str : list) {
            if (buf.length() > 0) {
                buf.append(separator);
            }
            buf.append(str);
        }

        return buf.toString();
    }

    public static JsonNode getNotNullNode(JsonNode parent, String name) throws InvalidObjectException {
        JsonNode node = parent.get(name);
        if (node == null) {
            throw new InvalidObjectException(String.format("Incorrect file format: expected parameter %s not found ", name));
        }

        return node;
    }
}