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package net.sourceforge.plantuml.tim.stdlib;

import java.util.List;
import java.util.Map;
import java.util.Set;

import net.sourceforge.plantuml.json.JsonValue;
import net.sourceforge.plantuml.text.StringLocated;
import net.sourceforge.plantuml.tim.EaterException;
import net.sourceforge.plantuml.tim.TContext;
import net.sourceforge.plantuml.tim.TFunctionSignature;
import net.sourceforge.plantuml.tim.TMemory;
import net.sourceforge.plantuml.tim.expression.TValue;

public class JsonMerge extends SimpleReturnFunction {

	public TFunctionSignature getSignature() {
		return new TFunctionSignature("%json_merge", 2);
	}

	@Override
	public boolean canCover(int nbArg, Set namedArgument) {
		return nbArg == 2;
	}

	@Override
	public TValue executeReturnFunction(TContext context, TMemory memory, StringLocated location, List values,
			Map named) throws EaterException {
		final TValue data0 = values.get(0);
		if (!data0.isJson())
			throw new EaterException("Not JSON data", location);
		final TValue data1 = values.get(1);
		if (!data1.isJson())
			throw new EaterException("Not JSON data", location);

		final JsonValue json0 = data0.toJson().cloneMe();
		final JsonValue json1 = data1.toJson();

		if ((!json0.isArray() && !json0.isObject() && !json1.isArray() && !json1.isObject())
				|| ((json0.isArray() && json1.isObject()) || (json0.isObject() && json1.isArray())))
			return data0;

		if (json0.isArray() && json1.isArray()) {
			for (JsonValue j1 : json1.asArray()) {
				json0.asArray().add(j1);
			}
			return TValue.fromJson(json0);
		}
		if (json0.isObject() && json1.isObject()) {	
			json0.asObject().merge(json1.asObject());
			return TValue.fromJson(json0);
		}
		throw new EaterException("Bad JSON type", location);
	}
}