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package com.dslplatform.json;

import java.io.IOException;
import java.util.*;

public abstract class ObjectConverter {

	private static final JsonReader.ReadObject> TypedMapReader = new JsonReader.ReadObject>() {
		@Nullable
		@Override
		public Map read(JsonReader reader) throws IOException {
			return reader.wasNull() ? null : deserializeMap(reader);
		}
	};
	@SuppressWarnings("rawtypes")
	static final JsonReader.ReadObject MapReader = new JsonReader.ReadObject() {
		@Nullable
		@Override
		public LinkedHashMap read(JsonReader reader) throws IOException {
			return reader.wasNull() ? null : deserializeMap(reader);
		}
	};

	public static void serializeNullableMap(@Nullable final Map value, final JsonWriter sw) {
		if (value == null) {
			sw.writeNull();
		} else {
			serializeMap(value, sw);
		}
	}

	public static void serializeMap(final Map value, final JsonWriter sw) {
		sw.writeByte(JsonWriter.OBJECT_START);
		final int size = value.size();
		if (size > 0) {
			final Iterator> iterator = value.entrySet().iterator();
			Map.Entry kv = iterator.next();
			sw.writeString(kv.getKey());
			sw.writeByte(JsonWriter.SEMI);
			sw.serializeObject(kv.getValue());
			for (int i = 1; i < size; i++) {
				sw.writeByte(JsonWriter.COMMA);
				kv = iterator.next();
				sw.writeString(kv.getKey());
				sw.writeByte(JsonWriter.SEMI);
				sw.serializeObject(kv.getValue());
			}
		}
		sw.writeByte(JsonWriter.OBJECT_END);
	}

	public static void serializeObject(@Nullable final Object value, final JsonWriter sw) throws IOException {
		sw.serializeObject(value);
	}

	@Nullable
	public static Object deserializeObject(final JsonReader reader) throws IOException {
		switch (reader.last()) {
			case 'n':
				if (!reader.wasNull()) {
					throw reader.newParseErrorAt("Expecting 'null' for null constant", 0);
				}
				return null;
			case 't':
				if (!reader.wasTrue()) {
					throw reader.newParseErrorAt("Expecting 'true' for true constant", 0);
				}
				return true;
			case 'f':
				if (!reader.wasFalse()) {
					throw reader.newParseErrorAt("Expecting 'false' for false constant", 0);
				}
				return false;
			case '"':
				return reader.readString();
			case '{':
				return deserializeMap(reader);
			case '[':
				return deserializeList(reader);
			default:
				return NumberConverter.deserializeNumber(reader);
		}
	}

	public static ArrayList