#ifndef PORYGONLANG_PARSER_HPP
#define PORYGONLANG_PARSER_HPP

#include <utility>
#include <vector>
#include "ParsedStatements/ParsedStatement.hpp"
#include "../Script.hpp"

namespace Porygon::Parser {
    enum class OperatorPrecedence {
        No,
        LogicalOr,
        LogicalAnd,
        Equality,
        Additive,
        Multiplication,
        Unary,
    };

    class Parser {
        vector<const IToken *> _tokens;
        unsigned int _position;
        Porygon::Script *ScriptData;

        const IToken *Peek();

        const IToken *PeekAt(int offset);

        const IToken *Next();

        // Statements

        ParsedStatement *ParseStatement(const IToken *current);
        ParsedStatement *ParseVariableAssignment(const IToken *current);
        ParsedStatement *ParseIndexAssignment(ParsedExpression *indexer);
        ParsedStatement *ParseBlock(const vector<TokenKind> &endTokens, const vector<const ParsedStatement *> &openStatements = {});
        ParsedStatement *ParseFunctionDeclaration(const IToken *current);
        ParsedStatement *ParseReturnStatement(const IToken *current);
        ParsedStatement *ParseIfStatement(const IToken *current);
        ParsedStatement *ParseForStatement();
        ParsedStatement *ParseNumericForStatement(const IToken *current);
        ParsedStatement *ParseGenericForStatement(const IToken *current);
        ParsedStatement *ParseWhileStatement(const IToken *current);

        // Expressions

        ParsedExpression *ParseExpression(const IToken *current);
        ParsedExpression *ParseBinaryExpression(const IToken *current, OperatorPrecedence parentPrecedence);
        ParsedExpression *ParsePrimaryExpression(const IToken *current);
        ParsedExpression *ParseParenthesizedExpression(const IToken *current);
        ParsedExpression *ParseFunctionCallExpression(ParsedExpression *functionExpression);
        ParsedExpression *ParseIndexExpression(ParsedExpression *indexingExpression);
        ParsedExpression *ParsePeriodIndexExpression(ParsedExpression *indexingExpression);
        ParsedExpression *ParseTableExpression(const IToken *current);

    public:
        ParsedScriptStatement *Parse();

        explicit Parser(const vector<const IToken *> &tokens, Porygon::Script *scriptData) {
            _tokens = tokens;
            _position = 0;
            ScriptData = scriptData;
        }

    };
}

#endif //PORYGONLANG_PARSER_HPP