package gudusoft.gsqlparser.parser;

import gudusoft.gsqlparser.EDbVendor;
import gudusoft.gsqlparser.TBaseType;
import gudusoft.gsqlparser.TCustomLexer;
import gudusoft.gsqlparser.TCustomParser;
import gudusoft.gsqlparser.TCustomSqlStatement;
import gudusoft.gsqlparser.TLexerNetezza;
import gudusoft.gsqlparser.TParserNetezza;
import gudusoft.gsqlparser.TSourceToken;
import gudusoft.gsqlparser.TSourceTokenList;
import gudusoft.gsqlparser.TStatementList;
import gudusoft.gsqlparser.TSyntaxError;
import gudusoft.gsqlparser.EFindSqlStateType;
import gudusoft.gsqlparser.ETokenType;
import gudusoft.gsqlparser.ETokenStatus;
import gudusoft.gsqlparser.ESqlStatementType;
import gudusoft.gsqlparser.EErrorType;
import gudusoft.gsqlparser.stmt.TUnknownSqlStatement;
import gudusoft.gsqlparser.stmt.oracle.TSqlplusCmdStatement;
import gudusoft.gsqlparser.sqlcmds.ISqlCmds;
import gudusoft.gsqlparser.sqlcmds.SqlCmdsFactory;
import gudusoft.gsqlparser.compiler.TContext;
import gudusoft.gsqlparser.sqlenv.TSQLEnv;
import gudusoft.gsqlparser.compiler.TGlobalScope;
import gudusoft.gsqlparser.compiler.TFrame;
import gudusoft.gsqlparser.resolver.TSQLResolver;
import gudusoft.gsqlparser.TLog;
import gudusoft.gsqlparser.compiler.TASTEvaluator;

import java.io.BufferedReader;
import java.util.ArrayList;
import java.util.List;
import java.util.Stack;

/**
 * Netezza database SQL parser implementation.
 *
 * <p>This parser handles Netezza-specific SQL syntax including:
 * <ul>
 *   <li>Netezza PL/SQL blocks (procedures, functions)</li>
 *   <li>SQL*Plus-like commands</li>
 *   <li>Netezza-specific DML/DDL</li>
 *   <li>Type casting expressions</li>
 *   <li>Special token handling (INNER, NOT DEFERRABLE, etc.)</li>
 * </ul>
 *
 * <p><b>Design Notes:</b>
 * <ul>
 *   <li>Extends {@link AbstractSqlParser} using the template method pattern</li>
 *   <li>Uses {@link TLexerNetezza} for tokenization</li>
 *   <li>Uses {@link TParserNetezza} for parsing</li>
 *   <li>Delimiter character: ';' for SQL statements</li>
 * </ul>
 *
 * <p><b>Usage Example:</b>
 * <pre>
 * // Get Netezza parser from factory
 * SqlParser parser = SqlParserFactory.get(EDbVendor.dbvnetezza);
 *
 * // Build context
 * ParserContext context = new ParserContext.Builder(EDbVendor.dbvnetezza)
 *     .sqlText("SELECT * FROM Employees WHERE DepartmentID = 10")
 *     .build();
 *
 * // Parse
 * SqlParseResult result = parser.parse(context);
 *
 * // Access statements
 * TStatementList statements = result.getSqlStatements();
 * </pre>
 *
 * @see SqlParser
 * @see AbstractSqlParser
 * @see TLexerNetezza
 * @see TParserNetezza
 */
public class NetezzaSqlParser extends AbstractSqlParser {

    /**
     * Construct Netezza SQL parser.
     * <p>
     * Configures the parser for Netezza database with default delimiter (;).
     * <p>
     * Following the original TGSqlParser pattern, the lexer and parser are
     * created once in the constructor and reused for all parsing operations.
     */
    public NetezzaSqlParser() {
        super(EDbVendor.dbvnetezza);
        this.delimiterChar = ';';
        this.defaultDelimiterStr = ";";

        // Create lexer once - will be reused for all parsing operations
        this.flexer = new TLexerNetezza();
        this.flexer.delimiterchar = this.delimiterChar;
        this.flexer.defaultDelimiterStr = this.defaultDelimiterStr;

        // Set parent's lexer reference for shared tokenization logic
        this.lexer = this.flexer;

        // Create parser once - will be reused for all parsing operations
        this.fparser = new TParserNetezza(null);
        this.fparser.lexer = this.flexer;
    }

    // ========== Parser Components ==========

    /** The Netezza lexer used for tokenization */
    public TLexerNetezza flexer;

    /** SQL parser (for Netezza statements) */
    private TParserNetezza fparser;

    /** Current statement being built during extraction */
    private TCustomSqlStatement gcurrentsqlstatement;

    // Note: Global context and frame stack fields inherited from AbstractSqlParser:
    // - protected TContext globalContext
    // - protected TSQLEnv sqlEnv
    // - protected Stack<TFrame> frameStack
    // - protected TFrame globalFrame

    // ========== AbstractSqlParser Abstract Methods Implementation ==========

    /**
     * Return the Netezza lexer instance.
     */
    @Override
    protected TCustomLexer getLexer(ParserContext context) {
        return this.flexer;
    }

    /**
     * Return the Netezza SQL parser instance with updated token list.
     */
    @Override
    protected TCustomParser getParser(ParserContext context, TSourceTokenList tokens) {
        this.fparser.sourcetokenlist = tokens;
        return this.fparser;
    }

    /**
     * Return null for secondary parser (Netezza only uses one parser).
     */
    @Override
    protected TCustomParser getSecondaryParser(ParserContext context, TSourceTokenList tokens) {
        // Netezza does not use a secondary parser like Oracle (which has PL/SQL parser)
        return null;
    }

    /**
     * Call Netezza-specific tokenization logic.
     * <p>
     * Delegates to donetezzatexttotokenlist which handles Netezza's
     * specific keyword recognition and token generation.
     */
    @Override
    protected void tokenizeVendorSql() {
        donetezzatexttotokenlist();
    }

    /**
     * Setup Netezza parser for raw statement extraction.
     * <p>
     * Netezza uses a single parser, so we inject sqlcmds and update
     * the token list for the main parser only.
     */
    @Override
    protected void setupVendorParsersForExtraction() {
        // Inject sqlcmds into parser (required for make_stmt)
        this.fparser.sqlcmds = this.sqlcmds;

        // Update token list for parser
        this.fparser.sourcetokenlist = this.sourcetokenlist;
    }

    /**
     * Call Netezza-specific raw statement extraction logic.
     * <p>
     * Delegates to donetezzagetrawsqlstatements which handles Netezza's
     * statement delimiters.
     */
    @Override
    protected void extractVendorRawStatements(SqlParseResult.Builder builder) {
        donetezzagetrawsqlstatements(builder);
    }

    /**
     * Perform full parsing of statements with syntax checking.
     * <p>
     * This method orchestrates the parsing of all statements.
     */
    @Override
    protected TStatementList performParsing(ParserContext context,
                                           TCustomParser parser,
                                           TCustomParser secondaryParser,
                                           TSourceTokenList tokens,
                                           TStatementList rawStatements) {
        // Store references
        this.fparser = (TParserNetezza) parser;
        this.sourcetokenlist = tokens;
        this.parserContext = context;

        // Use the raw statements passed from AbstractSqlParser.parse()
        this.sqlstatements = rawStatements;

        // Initialize statement parsing infrastructure
        this.sqlcmds = SqlCmdsFactory.get(vendor);

        // Inject sqlcmds into parser (required for make_stmt and other methods)
        this.fparser.sqlcmds = this.sqlcmds;

        // Initialize global context for semantic analysis
        initializeGlobalContext();

        // Parse each statement with exception handling for robustness
        for (int i = 0; i < sqlstatements.size(); i++) {
            TCustomSqlStatement stmt = sqlstatements.getRawSql(i);

            try {
                stmt.setFrameStack(frameStack);

                // Parse the statement
                int parseResult = stmt.parsestatement(null, false, context.isOnlyNeedRawParseTree());

                // Handle error recovery for CREATE TABLE/INDEX
                boolean doRecover = TBaseType.ENABLE_ERROR_RECOVER_IN_CREATE_TABLE;
                if (doRecover && ((parseResult != 0) || (stmt.getErrorCount() > 0))) {
                    handleCreateTableErrorRecovery(stmt);
                }

                // Collect syntax errors
                if ((parseResult != 0) || (stmt.getErrorCount() > 0)) {
                    copyErrorsFromStatement(stmt);
                }

            } catch (Exception ex) {
                // Use inherited exception handler from AbstractSqlParser
                // This provides consistent error handling across all database parsers
                handleStatementParsingException(stmt, i, ex);
                continue;
            }
        }

        // Clean up frame stack
        if (globalFrame != null) {
            globalFrame.popMeFromStack(frameStack);
        }

        return this.sqlstatements;
    }

    /**
     * Handle error recovery for CREATE TABLE/INDEX statements.
     */
    private void handleCreateTableErrorRecovery(TCustomSqlStatement stmt) {
        if (((stmt.sqlstatementtype == ESqlStatementType.sstcreatetable)
                || (stmt.sqlstatementtype == ESqlStatementType.sstcreateindex))
                && (!TBaseType.c_createTableStrictParsing)) {

            int nested = 0;
            boolean isIgnore = false, isFoundIgnoreToken = false;
            TSourceToken firstIgnoreToken = null;

            for (int k = 0; k < stmt.sourcetokenlist.size(); k++) {
                TSourceToken st = stmt.sourcetokenlist.get(k);
                if (isIgnore) {
                    if (st.issolidtoken() && (st.tokencode != ';')) {
                        isFoundIgnoreToken = true;
                        if (firstIgnoreToken == null) {
                            firstIgnoreToken = st;
                        }
                    }
                    if (st.tokencode != ';') {
                        st.tokencode = TBaseType.sqlpluscmd;
                    }
                    continue;
                }
                if (st.tokencode == (int) ')') {
                    nested--;
                    if (nested == 0) {
                        boolean isSelect = false;
                        TSourceToken st1 = st.searchToken(TBaseType.rrw_as, 1);
                        if (st1 != null) {
                            TSourceToken st2 = st.searchToken((int) '(', 2);
                            if (st2 != null) {
                                TSourceToken st3 = st.searchToken(TBaseType.rrw_select, 3);
                                isSelect = (st3 != null);
                            }
                        }
                        if (!isSelect) isIgnore = true;
                    }
                } else if (st.tokencode == (int) '(') {
                    nested++;
                }
            }

            if (isFoundIgnoreToken) {
                stmt.clearError();
                stmt.parsestatement(null, false);
            }
        }
    }

    /**
     * Perform Netezza-specific semantic analysis using TSQLResolver.
     */
    @Override
    protected void performSemanticAnalysis(ParserContext context, TStatementList statements) {
        if (TBaseType.isEnableResolver() && getSyntaxErrors().isEmpty()) {
            TSQLResolver resolver = new TSQLResolver(globalContext, statements);
            resolver.resolve();
        }
    }

    /**
     * Perform interpretation/evaluation on parsed statements.
     */
    @Override
    protected void performInterpreter(ParserContext context, TStatementList statements) {
        if (TBaseType.ENABLE_INTERPRETER && getSyntaxErrors().isEmpty()) {
            TLog.clearLogs();
            TGlobalScope interpreterScope = new TGlobalScope(sqlEnv);
            TLog.enableInterpreterLogOnly();
            TASTEvaluator astEvaluator = new TASTEvaluator(statements, interpreterScope);
            astEvaluator.eval();
        }
    }

    // ========== Netezza-Specific Tokenization ==========

    /**
     * Netezza-specific tokenization logic.
     * <p>
     * Extracted from: TGSqlParser.donetezzatexttotokenlist() (lines 3723-3894)
     */
    private void donetezzatexttotokenlist() {
        boolean insqlpluscmd = false;
        boolean isvalidplace = true;
        boolean waitingreturnforfloatdiv = false;
        boolean waitingreturnforsemicolon = false;
        boolean continuesqlplusatnewline = false;

        TSourceToken lct = null, prevst = null;

        TSourceToken asourcetoken, lcprevst;
        int yychar;

        asourcetoken = getanewsourcetoken();
        if (asourcetoken == null) return;
        yychar = asourcetoken.tokencode;

        while (yychar > 0) {
            sourcetokenlist.add(asourcetoken);
            switch (yychar) {
                case TBaseType.cmtdoublehyphen:
                case TBaseType.cmtslashstar:
                case TBaseType.lexspace: {
                    if (insqlpluscmd) {
                        asourcetoken.insqlpluscmd = true;
                    }
                    break;
                }
                case TBaseType.lexnewline: {
                    if (insqlpluscmd) {
                        insqlpluscmd = false;
                        isvalidplace = true;

                        if (continuesqlplusatnewline) {
                            insqlpluscmd = true;
                            isvalidplace = false;
                            asourcetoken.insqlpluscmd = true;
                        }
                    }

                    if (waitingreturnforsemicolon) {
                        isvalidplace = true;
                    }
                    if (waitingreturnforfloatdiv) {
                        isvalidplace = true;
                        lct.tokencode = TBaseType.sqlpluscmd;
                        if (lct.tokentype != ETokenType.ttslash) {
                            lct.tokentype = ETokenType.ttsqlpluscmd;
                        }
                    }
                    flexer.insqlpluscmd = insqlpluscmd;
                    break;
                } //case newline
                default: {
                    //solid tokentext
                    continuesqlplusatnewline = false;
                    waitingreturnforsemicolon = false;
                    waitingreturnforfloatdiv = false;
                    if (insqlpluscmd) {
                        asourcetoken.insqlpluscmd = true;
                        if (asourcetoken.getAstext().equalsIgnoreCase("-")) {
                            continuesqlplusatnewline = true;
                        }
                    } else {
                        if (asourcetoken.tokentype == ETokenType.ttsemicolon) {
                            waitingreturnforsemicolon = true;
                        }
                        if ((asourcetoken.tokentype == ETokenType.ttslash)
                                && (isvalidplace || (IsValidPlaceForDivToSqlplusCmd(sourcetokenlist, asourcetoken.posinlist)))) {
                            lct = asourcetoken;
                            waitingreturnforfloatdiv = true;
                        }
                        if ((isvalidplace) && isvalidsqlpluscmdInPostgresql(asourcetoken.toString())) {
                            asourcetoken.tokencode = TBaseType.sqlpluscmd;
                            if (asourcetoken.tokentype != ETokenType.ttslash) {
                                asourcetoken.tokentype = ETokenType.ttsqlpluscmd;
                            }
                            insqlpluscmd = true;
                            flexer.insqlpluscmd = insqlpluscmd;
                        }
                    }
                    isvalidplace = false;

                    // the inner keyword tokentext should be convert to TBaseType.ident when
                    // next solid tokentext is not join

                    if (prevst != null) {
                        if (prevst.tokencode == TBaseType.rrw_inner) {
                            if (asourcetoken.tokencode != flexer.getkeywordvalue("JOIN")) {
                                prevst.tokencode = TBaseType.ident;
                            }
                        }

                        if ((prevst.tokencode == TBaseType.rrw_not)
                                && (asourcetoken.tokencode == flexer.getkeywordvalue("DEFERRABLE"))) {
                            prevst.tokencode = flexer.getkeywordvalue("NOT_DEFERRABLE");
                        }
                    }

                    if (asourcetoken.tokencode == TBaseType.rrw_inner) {
                        prevst = asourcetoken;
                    } else if (asourcetoken.tokencode == TBaseType.rrw_not) {
                        prevst = asourcetoken;
                    } else {
                        prevst = null;
                    }

                    if ((asourcetoken.tokencode == flexer.getkeywordvalue("DIRECT_LOAD"))
                            || (asourcetoken.tokencode == flexer.getkeywordvalue("ALL"))) {
                        // RW_COMPRESS RW_FOR RW_ALL RW_OPERATIONS
                        // RW_COMPRESS RW_FOR RW_DIRECT_LOAD RW_OPERATIONS
                        // change rw_for to TBaseType.rw_for1, it conflicts with compress for update in create materialized view

                        lcprevst = getprevsolidtoken(asourcetoken);
                        if (lcprevst != null) {
                            if (lcprevst.tokencode == TBaseType.rrw_for)
                                lcprevst.tokencode = TBaseType.rw_for1;
                        }
                    }

                    if (asourcetoken.tokencode == TBaseType.rrw_dense_rank) {
                        //keep keyword can be column alias, make keep in keep_denserankclause as a different token code
                        TSourceToken stKeep = asourcetoken.searchToken(TBaseType.rrw_keep, -2);
                        if (stKeep != null) {
                            stKeep.tokencode = TBaseType.rrw_keep_before_dense_rank;
                        }
                    }
                }
            }

            asourcetoken = getanewsourcetoken();
            if (asourcetoken != null) {
                yychar = asourcetoken.tokencode;
            } else {
                yychar = 0;

                if (waitingreturnforfloatdiv) {
                    // / at the end of line treat as sqlplus command
                    lct.tokencode = TBaseType.sqlpluscmd;
                    if (lct.tokentype != ETokenType.ttslash) {
                        lct.tokentype = ETokenType.ttsqlpluscmd;
                    }
                }
            }

            if ((yychar == 0) && (prevst != null)) {
                if (prevst.tokencode == TBaseType.rrw_inner) {
                    prevst.tokencode = TBaseType.ident;
                }
            }
        }
    }

    /**
     * Get previous solid token in token list.
     */
    private TSourceToken getprevsolidtoken(TSourceToken currentToken) {
        if (currentToken == null || currentToken.posinlist == 0) {
            return null;
        }

        for (int i = currentToken.posinlist - 1; i >= 0; i--) {
            TSourceToken token = this.sourcetokenlist.get(i);
            if (token.issolidtoken()) {
                return token;
            }
        }
        return null;
    }

    /**
     * Check if a valid place for division operator to be treated as SQL*Plus command.
     * <p>
     * Migrated from TGSqlParser.IsValidPlaceForDivToSqlplusCmd() (lines 2641-2655).
     */
    private boolean IsValidPlaceForDivToSqlplusCmd(TSourceTokenList pstlist, int pPos) {
        boolean ret = false;

        if ((pPos <= 0) || (pPos > pstlist.size() - 1)) return ret;
        //token directly before div must be ttreturn without space appending it
        TSourceToken lcst = pstlist.get(pPos - 1);
        if (lcst.tokentype != ETokenType.ttreturn) {
            return ret;
        }

        if (!(lcst.getAstext().charAt(lcst.getAstext().length() - 1) == ' ')) {
            ret = true;
        }

        return ret;
    }

    /**
     * Check if a string is a valid SQL*Plus command in PostgreSQL/Netezza context.
     * <p>
     * Migrated from TGSqlParser.isvalidsqlpluscmdInPostgresql() (lines 2658-2660).
     * <p>
     * Note: This is a placeholder function that always returns false.
     */
    private boolean isvalidsqlpluscmdInPostgresql(String astr) {
        return false;
    }

    // ========== Netezza-Specific Raw Statement Extraction ==========

    /**
     * Netezza-specific raw statement extraction logic.
     * <p>
     * Extracted from: TGSqlParser.donetezzagetrawsqlstatements() (lines 9802-10069)
     */
    private void donetezzagetrawsqlstatements(SqlParseResult.Builder builder) {
        int waitingEnd = 0;
        boolean foundEnd = false;

        if (TBaseType.assigned(sqlstatements)) sqlstatements.clear();
        if (!TBaseType.assigned(sourcetokenlist)) {
            builder.errorCode(-1);
            builder.errorMessage("Source token list is null");
            return;
        }

        gcurrentsqlstatement = null;
        EFindSqlStateType gst = EFindSqlStateType.stnormal;
        TSourceToken lcprevsolidtoken = null, ast = null;

        for (int i = 0; i < sourcetokenlist.size(); i++) {

            if ((ast != null) && (ast.issolidtoken()))
                lcprevsolidtoken = ast;

            ast = sourcetokenlist.get(i);
            sourcetokenlist.curpos = i;

            // Change token code if necessary for type cast tokens
            if (ast.tokencode == TBaseType.rrw_int) {
                if (isTypeCastToken(ast)) ast.tokencode = TBaseType.rrw_int_cast;
            } else if (ast.tokencode == TBaseType.rrw_integer) {
                if (isTypeCastToken(ast)) ast.tokencode = TBaseType.rrw_integer_cast;
            } else if (ast.tokencode == TBaseType.rrw_smallint) {
                if (isTypeCastToken(ast)) ast.tokencode = TBaseType.rrw_smallint_cast;
            } else if (ast.tokencode == TBaseType.rrw_bigint) {
                if (isTypeCastToken(ast)) ast.tokencode = TBaseType.rrw_bigint_cast;
            } else if (ast.tokencode == TBaseType.rrw_real) {
                if (isTypeCastToken(ast)) ast.tokencode = TBaseType.rrw_real_cast;
            } else if (ast.tokencode == TBaseType.rrw_float) {
                if (isTypeCastToken(ast)) ast.tokencode = TBaseType.rrw_float_cast;
            } else if (ast.tokencode == TBaseType.rrw_numeric) {
                if (isTypeCastToken(ast)) ast.tokencode = TBaseType.rrw_numeric_cast;
            } else if (ast.tokencode == TBaseType.rrw_bit) {
                if (isTypeCastToken(ast)) ast.tokencode = TBaseType.rrw_bit_cast;
            } else if (ast.tokencode == TBaseType.rrw_char) {
                if (isTypeCastToken(ast)) ast.tokencode = TBaseType.rrw_char_cast;
            } else if (ast.tokencode == TBaseType.rrw_nchar) {
                if (isTypeCastToken(ast)) ast.tokencode = TBaseType.rrw_nchar_cast;
            } else if (ast.tokencode == TBaseType.rrw_varchar) {
                if (isTypeCastToken(ast)) ast.tokencode = TBaseType.rrw_varchar_cast;
            } else if (ast.tokencode == TBaseType.rrw_character) {
                if (isTypeCastToken(ast)) ast.tokencode = TBaseType.rrw_character_cast;
            } else if (ast.tokencode == TBaseType.rrw_date) {
                if (isTypeCastToken(ast)) ast.tokencode = TBaseType.rrw_date_cast;
            } else if (ast.tokencode == TBaseType.rrw_time) {
                if (isTypeCastToken(ast)) ast.tokencode = TBaseType.rrw_time_cast;
            } else if (ast.tokencode == TBaseType.rrw_timestamp) {
                if (isTypeCastToken(ast)) ast.tokencode = TBaseType.rrw_timestamp_cast;
            } else if (ast.tokencode == TBaseType.rrw_interval) {
                if (isTypeCastToken(ast)) ast.tokencode = TBaseType.rrw_interval_cast;
            } else if (ast.tokencode == TBaseType.rrw_decimal) {
                if (isTypeCastToken(ast)) ast.tokencode = TBaseType.rrw_decimal_cast;
            }

            switch (gst) {
                case sterror: {
                    if (ast.tokentype == ETokenType.ttsemicolon) {
                        gcurrentsqlstatement.sourcetokenlist.add(ast);
                        onRawStatementComplete(parserContext, gcurrentsqlstatement, fparser, null, sqlstatements, false, builder);
                        gst = EFindSqlStateType.stnormal;
                    } else {
                        gcurrentsqlstatement.sourcetokenlist.add(ast);
                    }
                    break;
                } //sterror

                case stnormal: {
                    if ((ast.tokencode == TBaseType.cmtdoublehyphen)
                            || (ast.tokencode == TBaseType.cmtslashstar)
                            || (ast.tokencode == TBaseType.lexspace)
                            || (ast.tokencode == TBaseType.lexnewline)
                            || (ast.tokentype == ETokenType.ttsemicolon)) {
                        if (gcurrentsqlstatement != null) {
                            gcurrentsqlstatement.sourcetokenlist.add(ast);
                        }

                        if ((lcprevsolidtoken != null) && (ast.tokentype == ETokenType.ttsemicolon)) {
                            if (lcprevsolidtoken.tokentype == ETokenType.ttsemicolon) {
                                // ;;;; continuous semicolon,treat it as comment
                                ast.tokentype = ETokenType.ttsimplecomment;
                                ast.tokencode = TBaseType.cmtdoublehyphen;
                            }
                        }

                        continue;
                    }

                    if (ast.tokencode == TBaseType.sqlpluscmd) {
                        gst = EFindSqlStateType.stsqlplus;
                        gcurrentsqlstatement = new TSqlplusCmdStatement(vendor);
                        gcurrentsqlstatement.sourcetokenlist.add(ast);
                        continue;
                    }

                    // find a tokentext to start sql or plsql mode
                    gcurrentsqlstatement = sqlcmds.issql(ast, gst, gcurrentsqlstatement);

                    if (gcurrentsqlstatement != null) {
                        if (gcurrentsqlstatement.isnzplsql()) {
                            gst = EFindSqlStateType.ststoredprocedure;
                            gcurrentsqlstatement.sourcetokenlist.add(ast);
                            foundEnd = false;
                            if ((ast.tokencode == TBaseType.rrw_begin)
                                    || (ast.tokencode == TBaseType.rrw_package)
                                    || (ast.searchToken(TBaseType.rrw_package, 4) != null)) {
                                waitingEnd = 1;
                            }
                        } else {
                            gst = EFindSqlStateType.stsql;
                            gcurrentsqlstatement.sourcetokenlist.add(ast);
                        }
                    } else {
                        //error tokentext found

                        this.syntaxErrors.add(new TSyntaxError(ast.getAstext(), ast.lineNo, (ast.columnNo < 0 ? 0 : ast.columnNo)
                                , "Error when tokenlize", EErrorType.spwarning, TBaseType.MSG_WARNING_ERROR_WHEN_TOKENIZE, null, ast.posinlist));

                        ast.tokentype = ETokenType.tttokenlizererrortoken;
                        gst = EFindSqlStateType.sterror;

                        gcurrentsqlstatement = new TUnknownSqlStatement(vendor);
                        gcurrentsqlstatement.sqlstatementtype = ESqlStatementType.sstinvalid;
                        gcurrentsqlstatement.sourcetokenlist.add(ast);
                    }

                    break;
                } // stnormal

                case stsqlplus: {
                    if (ast.insqlpluscmd) {
                        gcurrentsqlstatement.sourcetokenlist.add(ast);
                    } else {
                        gst = EFindSqlStateType.stnormal; //this tokentext must be newline,
                        gcurrentsqlstatement.sourcetokenlist.add(ast); // so add it here
                        onRawStatementComplete(parserContext, gcurrentsqlstatement, fparser, null, sqlstatements, false, builder);
                    }

                    break;
                }//case stsqlplus

                case stsql: {
                    if (ast.tokentype == ETokenType.ttsemicolon) {
                        gst = EFindSqlStateType.stnormal;
                        gcurrentsqlstatement.sourcetokenlist.add(ast);
                        gcurrentsqlstatement.semicolonended = ast;
                        onRawStatementComplete(parserContext, gcurrentsqlstatement, fparser, null, sqlstatements, false, builder);
                        continue;
                    }

                    if (sourcetokenlist.sqlplusaftercurtoken()) { //most probably is / cmd
                        gst = EFindSqlStateType.stnormal;
                        gcurrentsqlstatement.sourcetokenlist.add(ast);
                        onRawStatementComplete(parserContext, gcurrentsqlstatement, fparser, null, sqlstatements, false, builder);
                        continue;
                    }
                    gcurrentsqlstatement.sourcetokenlist.add(ast);
                    break;
                }//case stsql

                case ststoredprocedure: {
                    if ((ast.tokencode == TBaseType.rrw_begin)) {
                        waitingEnd++;
                    } else if ((ast.tokencode == TBaseType.rrw_if)) {
                        if (ast.searchToken(TBaseType.rrw_end, -1) == null) {
                            //this is not if after END
                            waitingEnd++;
                        }
                    } else if ((ast.tokencode == TBaseType.rrw_case)) {
                        if (ast.searchToken(TBaseType.rrw_end, -1) == null) {
                            //this is not case after END
                            waitingEnd++;
                        }
                    } else if ((ast.tokencode == TBaseType.rrw_loop)) {
                        if (ast.searchToken(TBaseType.rrw_end, -1) == null) {
                            //this is not loop after END
                            waitingEnd++;
                        }
                    } else if (ast.tokencode == TBaseType.rrw_end) {
                        foundEnd = true;
                        waitingEnd--;
                        if (waitingEnd < 0) {
                            waitingEnd = 0;
                        }
                    }

                    if ((ast.tokentype == ETokenType.ttslash) && (ast.tokencode == TBaseType.sqlpluscmd)) {
                        // TPlsqlStatementParse(asqlstatement).TerminatorToken := ast;
                        ast.tokenstatus = ETokenStatus.tsignorebyyacc;
                        gst = EFindSqlStateType.stnormal;
                        onRawStatementComplete(parserContext, gcurrentsqlstatement, fparser, null, sqlstatements, false, builder);

                        //make / a sqlplus cmd
                        gcurrentsqlstatement = new TSqlplusCmdStatement(vendor);
                        gcurrentsqlstatement.sourcetokenlist.add(ast);
                        onRawStatementComplete(parserContext, gcurrentsqlstatement, fparser, null, sqlstatements, false, builder);
                    } else if ((ast.tokentype == ETokenType.ttperiod) && (sourcetokenlist.returnaftercurtoken(false)) && (sourcetokenlist.returnbeforecurtoken(false))) {
                        // single dot at a separate line
                        ast.tokenstatus = ETokenStatus.tsignorebyyacc;
                        gst = EFindSqlStateType.stnormal;
                        onRawStatementComplete(parserContext, gcurrentsqlstatement, fparser, null, sqlstatements, false, builder);

                        //make ttperiod a sqlplus cmd
                        gcurrentsqlstatement = new TSqlplusCmdStatement(vendor);
                        gcurrentsqlstatement.sourcetokenlist.add(ast);
                        onRawStatementComplete(parserContext, gcurrentsqlstatement, fparser, null, sqlstatements, false, builder);
                    } else {
                        gcurrentsqlstatement.sourcetokenlist.add(ast);
                        if ((ast.tokentype == ETokenType.ttsemicolon) && (waitingEnd == 0) && (foundEnd) && (gcurrentsqlstatement.OracleStatementCanBeSeparatedByBeginEndPair())) {
                            gst = EFindSqlStateType.stnormal;
                            onRawStatementComplete(parserContext, gcurrentsqlstatement, fparser, null, sqlstatements, false, builder);
                        } else if ((ast.searchToken(TBaseType.rrw_create, 1) != null) && (ast.searchToken(TBaseType.rrw_procedure, 4) != null) && (waitingEnd == 0)) {
                            gst = EFindSqlStateType.stnormal;
                            onRawStatementComplete(parserContext, gcurrentsqlstatement, fparser, null, sqlstatements, false, builder);
                        }
                    }

                    break;
                } //ststoredprocedure
            } //switch
        }//for

        //last statement
        if ((gcurrentsqlstatement != null) &&
                ((gst == EFindSqlStateType.stsqlplus) || (gst == EFindSqlStateType.stsql) || (gst == EFindSqlStateType.ststoredprocedure) ||
                        (gst == EFindSqlStateType.sterror))) {
            onRawStatementComplete(parserContext, gcurrentsqlstatement, fparser, null, sqlstatements, true, builder);
        }

        builder.errorCode(syntaxErrors.size());
        builder.sqlStatements(this.sqlstatements);
    }

    /**
     * Check if a token is a type cast token.
     * <p>
     * Migrated from TGSqlParser.isTypeCastToken() (lines 9791-9800).
     * <p>
     * Distinguishes between function-style type casts and regular expressions:
     * <ul>
     *   <li>INT(column_name) - type cast (returns true)</li>
     *   <li>INT(5) - numeric literal (returns false)</li>
     * </ul>
     */
    private boolean isTypeCastToken(TSourceToken ast) {
        boolean istypecasetoken = false;
        TSourceToken st = ast.searchToken('(', 1);
        if (st != null) {
            TSourceToken nst = st.searchToken(TBaseType.iconst, 1);
            istypecasetoken = (nst == null);
        }
        return istypecasetoken;
    }
}