#pragma once

#include <Token.h>

namespace LXC::Lexer
{
	struct LexerContext final
	{
		// Constructor to set the information of the context //
		LexerContext(const std::string& _source);

		// Trackers for the Lexer itself //
		const std::string& source;
		__int32 index;

		LexerOutput out;
		const __int32 len;

		// Trackers for where the Lexer is within the user version of source //
		unsigned short column;
		unsigned short line;
	};

	struct LexerError final
	{
		// Different reasons why the Lexer can fail //
		enum Reason
		{
			InvalidCharacter,
			UnterminatedStringLiteral
		};

		// Constructor to pass arguments through to the struct //
		LexerError(Reason _reason, __int32 errorIndex)
			: reason(_reason), index(errorIndex)
		{}

		// Turns the error into a c-string //
		inline static const char* const ReasonStr(Reason reason)
		{
			static const char* reasons[] =
			{
				"Invalid character found in source: ",
				"Unterminated string literal in source starting at: "
			};

			return reasons[reason];
		}

		// Error information //
		const Reason reason;
		const __int32 index;
	};

	// Turns a file into a vector of tokens //
	Util::ReturnVal<LexerOutput, LexerError> TokenizeFile(const std::string& fileContents);
}