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package net.leanix.gsit;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.fasterxml.jackson.databind.node.TextNode;
import com.google.common.base.Optional;
import com.google.common.hash.Hashing;
import com.google.common.io.BaseEncoding;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Map;
import java.util.function.Supplier;

public class Utils {

    public static String md5(String input, String encoding) throws UnsupportedEncodingException {
        byte[] inputBytes = input.getBytes(encoding);
        byte[] outputBytes = Hashing.md5().hashBytes(inputBytes).asBytes();
        return BaseEncoding.base16().encode(outputBytes).toLowerCase();
    }

    public static String base64(String input, String encoding) throws UnsupportedEncodingException {
        byte[] inputBytes = input.getBytes(encoding);
        return BaseEncoding.base64().encode(inputBytes);
    }

    public static JsonNode parseJson(String jsonString, ObjectMapper objectMapper) throws IOException {
        return objectMapper.readTree(jsonString);
    }

    public static  V getOrThrow(Map map, K key, Supplier exception) throws T {
        V result = map.get(key);
        if (result == null) {
            throw exception.get();
        } else {
            return result;
        }
    }

    public static Optional getAttributeAccordingToDefinition(ObjectNode node, EventAttributeDefinition definition) throws MissingAttributeException, MalformedAttributeException {
        boolean attributeRequired = definition.isRequired().or(false);
        Optional maybeAttribute = deepGet(node, definition.getPath());
        boolean attributeNeedsToBeHashed = definition.isHashed().or(false);
        Optional result;
        if (attributeRequired && !maybeAttribute.isPresent()) {
                throw new MissingAttributeException(definition);
        }
        if (maybeAttribute.isPresent()) {
            JsonNode value = maybeAttribute.get();
            if (attributeNeedsToBeHashed) {
                try {
                    return Optional.of(TextNode.valueOf(Utils.md5(value.asText(), "UTF-8")));
                } catch (UnsupportedEncodingException e) {
                    throw new MalformedAttributeException(definition, e);
                }
            } else {
                return Optional.of(value);
            }
        } else {
            return Optional.absent();
        }
    }

    public static Optional deepGet(ObjectNode node, String pathString) {
        String[] pathSplit = pathString.split("\\.");
        JsonNode currentNode = node;
        for (int pathIndex = 0; pathIndex < pathSplit.length; pathIndex++) {
            String pathSegment = pathSplit[pathIndex];
            if (currentNode.has(pathSegment)) {
                currentNode = currentNode.get(pathSegment);
                if (pathIndex == pathSplit.length - 1) {
                    if (currentNode.isNull()) {
                        return Optional.absent();
                    } else {
                        return Optional.of(currentNode);
                    }
                } else {
                    if (!currentNode.isObject()) {
                        return Optional.absent();
                    }
                }
            } else {
                return Optional.absent();
            }
        }
        return Optional.absent();
    }


    public static ObjectNode deepSet(ObjectNode object, String pathString, JsonNode value, ObjectMapper objectMapper) {
        String[] pathSplit = pathString.split("\\.");
        ObjectNode currentNode = object;
        for (int pathIndex = 0; pathIndex < pathSplit.length; pathIndex++) {
            String pathSegment = pathSplit[pathIndex];
            if (pathIndex == pathSplit.length - 1) {
                currentNode.set(pathSegment, value);
            } else {
                if (currentNode.has(pathSegment) && currentNode.get(pathSegment).isObject()) {
                    currentNode = (ObjectNode) currentNode.get(pathSegment);
                } else {
                    ObjectNode newNode = objectMapper.createObjectNode();
                    currentNode.set(pathSegment, newNode);
                    currentNode = newNode;
                }
            }
        }
        return object;
    }

}