// Copyright (c) 2012 TNO, The Netherlands.
//
// This file contains information proprietary to TNO.
//
// Any disclosure or use of this information or any reproduction of this document or any part thereof for
// other than the specified purpose for which it is intended is expressly prohibited except as TNO may
// otherwise agree to in writing.

#pragma once

// stl includes
#include <string>
#include <list>

// jsoncpp includes
#include <json/json.h>

/**
 * JsonSchemaChecker is a very basic implementation of json schema.
 * The json schema definition draft can be found at
 * http://tools.ietf.org/html/draft-zyp-json-schema-03
 *
 * The following keywords are supported:
 * - type
 * - required
 * - properties
 * - items
 * - enum
 * - minimum
 * - maximum
 */
class JsonSchemaChecker
{
public:
	JsonSchemaChecker();
	virtual ~JsonSchemaChecker();

	bool setSchema(const Json::Value & schema);

	bool validate(const Json::Value & value);

	const std::list<std::string> & getMessages() const;

private:
	void collectReferences(const Json::Value & schema);

	void validate(const Json::Value &value, const Json::Value & schema);

	void setMessage(const std::string & message);

	void collectDependencies(const Json::Value & value, const Json::Value &schema);

private:
	// attribute check functions
	void checkType(const Json::Value & value, const Json::Value & schema);
	void checkProperties(const Json::Value & value, const Json::Value & schema);
	void checkAdditionalProperties(const Json::Value & value, const Json::Value & schema, const Json::Value::Members & ignoredProperties);
	void checkDependencies(const Json::Value & value, const Json::Value & schemaLink);
	void checkMinimum(const Json::Value & value, const Json::Value & schema);
	void checkMaximum(const Json::Value & value, const Json::Value & schema);
	void checkItems(const Json::Value & value, const Json::Value & schema);
	void checkMinItems(const Json::Value & value, const Json::Value & schema);
	void checkMaxItems(const Json::Value & value, const Json::Value & schema);
	void checkUniqueItems(const Json::Value & value, const Json::Value & schema);
	void checkEnum(const Json::Value & value, const Json::Value & schema);

private:
	Json::Value _schema;

	std::list<std::string> _currentPath;
	std::list<std::string> _messages;
	bool _error;

	std::map<std::string, const Json::Value *> _references; // ref 2 value
};