#ifndef _CLI_PARSER_H_
#define _CLI_PARSER_H_

#include <ast/Param.h>
#include <ast/Statement.h>
#include <ast/Option.h>
#include <ast/Arg.h>

#include <ast/options/TypeOption.h>
#include <ast/options/CategoryOption.h>

#include <command/Command.h>

#include <ast/statements/StatementList.h>

#include <lexer/Lexer.h>

#include <exception/CommonException.h>

#include <alib/algorithm>

namespace cli {

class Parser {
	cli::Lexer m_lexer;
	cli::Lexer::Token m_current;

public:
	Parser ( cli::Lexer lexer ) : m_lexer ( std::move ( lexer ) ), m_current ( m_lexer.nextToken ( ) ) {
	}

	template < class ... Tokens >
	bool check ( Tokens ... tokens ) const {
		// TODO repace in c++17 with fold expressions
		return ext::orAll ( m_current.m_type == tokens ... );
	}

	template < class ... NonreservedTokens >
	bool check_nonreserved_kw ( const NonreservedTokens & ... kw ) const {
		return m_current.m_type == Lexer::TokenType::IDENTIFIER && ext::orAll ( m_current.m_value == kw ... );
	}

	template < class ... Tokens >
	bool match ( Tokens ... tokens ) {
		if ( ! check ( tokens ... ) )
			throw exception::CommonException ( "Mismatched token while matching a token." );
		m_current = m_lexer.nextToken ( );
		return true;
	}

	bool match_nonreserved_kw ( const std::string & kw ) {
		if ( ! check_nonreserved_kw ( kw ) )
			throw exception::CommonException ( "Mismatched token while matching a token." );
		m_current = m_lexer.nextToken ( );
		return true;
	}

	std::string matchIdentifier ( ) {
		if ( ! check ( Lexer::TokenType::IDENTIFIER ) )
			throw exception::CommonException ( "Mismatched token while matching a token." );
		std::string res = m_current.m_value;
		m_current = m_lexer.nextToken ( );
		return res;
	}

	std::string matchString ( ) {
		if ( ! check ( Lexer::TokenType::STRING ) )
			throw exception::CommonException ( "Mismatched token while matching a token." );
		std::string res = m_current.m_value;
		m_current = m_lexer.nextToken ( );
		return res;
	}

	int matchInteger ( ) {
		if ( ! check ( Lexer::TokenType::INTEGER ) )
			throw exception::CommonException ( "Mismatched token while matching a token."  );
		int res = ext::from_string < int > ( m_current.m_value );
		m_current = m_lexer.nextToken ( );
		return res;
	}

	std::string getTokenValue ( ) {
		return m_current.m_value;
	}

	std::unique_ptr < CategoryOption > category_option ( );
	std::unique_ptr < TypeOption > type_option ( );

	std::unique_ptr < Arg > arg ( );

	std::unique_ptr < Arg > optional_arg ( );

	bool move_arg ( );

	std::unique_ptr < Param > in_redirect_param ( );

	std::unique_ptr < Param > param ( );
	
	std::unique_ptr < Arg > template_param ( );

	std::unique_ptr < Param > move_param ( );

	std::unique_ptr < Param > value_param ( );

	std::shared_ptr < Statement > in_redirect_statement ( );

	std::shared_ptr < Statement > single_statement ( );

	std::shared_ptr < StatementList > statement_list ( );

	std::shared_ptr < StatementList > statement_list_cont ( );

	void out_redirect ( std::shared_ptr < StatementList > & list );

	void result ( std::shared_ptr < StatementList > & list );

	std::pair < bool, bool > introspect_cast_from_to ( );

	std::unique_ptr < Command > introspect_command ( );

	std::unique_ptr < Command > parse ( );

};

} /* namespace cli */

#endif /* _CLI_PARSER_H_ */