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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.dialect;

import java.sql.DatabaseMetaData;
import java.sql.SQLException;
import java.sql.Types;

import org.hibernate.boot.model.FunctionContributions;
import org.hibernate.dialect.function.CommonFunctionFactory;
import org.hibernate.dialect.identity.HSQLIdentityColumnSupport;
import org.hibernate.dialect.identity.IdentityColumnSupport;
import org.hibernate.dialect.pagination.LimitHandler;
import org.hibernate.dialect.pagination.OffsetFetchLimitHandler;
import org.hibernate.dialect.sequence.HSQLSequenceSupport;
import org.hibernate.dialect.sequence.SequenceSupport;
import org.hibernate.dialect.temptable.TemporaryTable;
import org.hibernate.dialect.temptable.TemporaryTableKind;
import org.hibernate.dialect.unique.CreateTableUniqueDelegate;
import org.hibernate.dialect.unique.UniqueDelegate;
import org.hibernate.engine.jdbc.dialect.spi.DialectResolutionInfo;
import org.hibernate.engine.jdbc.env.spi.IdentifierHelper;
import org.hibernate.engine.jdbc.env.spi.IdentifierHelperBuilder;
import org.hibernate.engine.jdbc.env.spi.NameQualifierSupport;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.exception.spi.TemplatedViolatedConstraintNameExtractor;
import org.hibernate.exception.spi.ViolatedConstraintNameExtractor;
import org.hibernate.internal.util.JdbcExceptionHelper;
import org.hibernate.metamodel.mapping.EntityMappingType;
import org.hibernate.metamodel.spi.RuntimeModelCreationContext;
import org.hibernate.query.sqm.CastType;
import org.hibernate.query.sqm.IntervalType;
import org.hibernate.query.sqm.NullOrdering;
import org.hibernate.query.sqm.TemporalUnit;
import org.hibernate.query.sqm.mutation.internal.temptable.AfterUseAction;
import org.hibernate.query.sqm.mutation.internal.temptable.BeforeUseAction;
import org.hibernate.query.sqm.mutation.internal.temptable.LocalTemporaryTableInsertStrategy;
import org.hibernate.query.sqm.mutation.internal.temptable.LocalTemporaryTableMutationStrategy;
import org.hibernate.query.sqm.mutation.spi.SqmMultiTableInsertStrategy;
import org.hibernate.query.sqm.mutation.spi.SqmMultiTableMutationStrategy;
import org.hibernate.sql.ast.SqlAstNodeRenderingMode;
import org.hibernate.sql.ast.SqlAstTranslator;
import org.hibernate.sql.ast.SqlAstTranslatorFactory;
import org.hibernate.sql.ast.spi.SqlAppender;
import org.hibernate.sql.ast.spi.StandardSqlAstTranslatorFactory;
import org.hibernate.sql.ast.tree.Statement;
import org.hibernate.sql.exec.spi.JdbcOperation;
import org.hibernate.tool.schema.extract.internal.SequenceInformationExtractorHSQLDBDatabaseImpl;
import org.hibernate.tool.schema.extract.spi.SequenceInformationExtractor;
import org.hibernate.type.spi.TypeConfiguration;

import jakarta.persistence.TemporalType;

import static org.hibernate.exception.spi.TemplatedViolatedConstraintNameExtractor.extractUsingTemplate;
import static org.hibernate.type.SqlTypes.DOUBLE;
import static org.hibernate.type.SqlTypes.NCLOB;

/**
 * A {@linkplain Dialect SQL dialect} for HSQLDB (HyperSQL) 2.6.1 and above.
 *
 * @author Christoph Sturm
 * @author Phillip Baird
 * @author Fred Toussi
 */
public class HSQLDialect extends Dialect {

	private static final DatabaseVersion MINIMUM_VERSION = DatabaseVersion.make( 2, 6, 1 );
	private final UniqueDelegate uniqueDelegate = new CreateTableUniqueDelegate(this);
	private final HSQLIdentityColumnSupport identityColumnSupport;

	public HSQLDialect(DialectResolutionInfo info) {
		super( info );
		this.identityColumnSupport = new HSQLIdentityColumnSupport( getVersion() );
	}

	public HSQLDialect() {
		this( MINIMUM_VERSION );
	}

	public HSQLDialect(DatabaseVersion version) {
		super( version );
		this.identityColumnSupport = new HSQLIdentityColumnSupport( getVersion() );
	}

	@Override
	protected DatabaseVersion getMinimumSupportedVersion() {
		return MINIMUM_VERSION;
	}

	@Override
	protected void registerDefaultKeywords() {
		super.registerDefaultKeywords();
		registerKeyword( "period" );
	}

	@Override
	protected String columnType(int sqlTypeCode) {
		// Note that all floating point types are synonyms for 'double'

		// Note that the HSQL type 'longvarchar' and 'longvarbinary' are
		// synonyms for 'varchar(16M)' and 'varbinary(16M)' respectively.
		// But using these types results in schema validation issue as
		// described in HHH-9693.

		switch ( sqlTypeCode ) {
			//HSQL has no 'nclob' type, but 'clob' is Unicode (See HHH-10364)
			case NCLOB:
				return "clob";
			default:
				return super.columnType( sqlTypeCode );
		}
	}

	@Override
	protected Integer resolveSqlTypeCode(String typeName, String baseTypeName, TypeConfiguration typeConfiguration) {
		switch ( baseTypeName ) {
			case "DOUBLE":
				return DOUBLE;
		}
		return super.resolveSqlTypeCode( typeName, baseTypeName, typeConfiguration );
	}

	@Override
	public int getDefaultStatementBatchSize() {
		return 15;
	}

	@Override
	public void initializeFunctionRegistry(FunctionContributions functionContributions) {
		super.initializeFunctionRegistry(functionContributions);

		CommonFunctionFactory functionFactory = new CommonFunctionFactory(functionContributions);

		// AVG by default uses the input type, so we possibly need to cast the argument type, hence a special function
		functionFactory.avg_castingNonDoubleArguments( this, SqlAstNodeRenderingMode.DEFAULT );

		functionFactory.cot();
		functionFactory.radians();
		functionFactory.degrees();
		functionFactory.log10();
		functionFactory.rand();
		functionFactory.trunc_dateTrunc_trunc();
		functionFactory.pi();
		functionFactory.soundex();
		functionFactory.reverse();
		functionFactory.space();
		functionFactory.repeat();
		functionFactory.translate();
		functionFactory.bitand();
		functionFactory.bitor();
		functionFactory.bitxor();
		functionFactory.bitnot();
		functionFactory.yearMonthDay();
		functionFactory.hourMinuteSecond();
		functionFactory.dayofweekmonthyear();
		functionFactory.weekQuarter();
		functionFactory.daynameMonthname();
		functionFactory.lastDay();
		functionFactory.trim1();
		functionFactory.toCharNumberDateTimestamp();
		functionFactory.concat_pipeOperator();
		functionFactory.localtimeLocaltimestamp();
		functionFactory.bitLength();
		functionFactory.octetLength();
		functionFactory.ascii();
		functionFactory.chr_char();
		functionFactory.instr();
		functionFactory.substr();
		//also natively supports ANSI-style substring()
		functionFactory.position();
		functionFactory.nowCurdateCurtime();
		functionFactory.insert();
		functionFactory.overlay();
		functionFactory.median();
		functionFactory.stddevPopSamp();
		functionFactory.varPopSamp();
		functionFactory.addMonths();
		functionFactory.monthsBetween();
		functionFactory.collate_quoted();

		//SYSDATE is similar to LOCALTIMESTAMP but it returns the timestamp when it is called
		functionFactory.sysdate();

		// from v. 2.2.0 ROWNUM() is supported in all modes as the equivalent of Oracle ROWNUM
		functionFactory.rownum();
		functionFactory.listagg_groupConcat();
	}

	@Override
	public String currentTime() {
		return "localtime";
	}

	@Override
	public String currentTimestamp() {
		return "localtimestamp";
	}

	@Override
	public String currentTimestampWithTimeZone() {
		return "current_timestamp";
	}

	@Override
	public SqlAstTranslatorFactory getSqlAstTranslatorFactory() {
		return new StandardSqlAstTranslatorFactory() {
			@Override
			protected  SqlAstTranslator buildTranslator(
					SessionFactoryImplementor sessionFactory, Statement statement) {
				return new HSQLSqlAstTranslator<>( sessionFactory, statement );
			}
		};
	}
	@Override
	public String castPattern(CastType from, CastType to) {
		String result;
		switch ( to ) {
			case INTEGER:
			case LONG:
				result = BooleanDecoder.toInteger( from );
				if ( result != null ) {
					return result;
				}
				break;
			case BOOLEAN:
				result = BooleanDecoder.toBoolean( from );
				if ( result != null ) {
					return result;
				}
				break;
			case INTEGER_BOOLEAN:
				result = BooleanDecoder.toIntegerBoolean( from );
				if ( result != null ) {
					return result;
				}
				break;
			case YN_BOOLEAN:
				result = BooleanDecoder.toYesNoBoolean( from );
				if ( result != null ) {
					return result;
				}
				break;
			case TF_BOOLEAN:
				result = BooleanDecoder.toTrueFalseBoolean( from );
				if ( result != null ) {
					return result;
				}
				break;
			case STRING:
				result = BooleanDecoder.toString( from );
				if ( result != null ) {
					return "trim(" + result + ')';
				}
				break;
		}
		return super.castPattern( from, to );
	}

	@Override
	public String timestampaddPattern(TemporalUnit unit, TemporalType temporalType, IntervalType intervalType) {
		StringBuilder pattern = new StringBuilder();
		boolean castTo = temporalType != TemporalType.TIMESTAMP && !unit.isDateUnit();
		switch (unit) {
			case NANOSECOND:
			case NATIVE:
				pattern.append("timestampadd(sql_tsi_frac_second,?2,"); //nanos
				break;
			case WEEK:
				pattern.append("dateadd('day',?2*7,");
				break;
			default:
				pattern.append("dateadd('?1',?2,");
		}
		if (castTo) {
			pattern.append("cast(?3 as timestamp)");
		}
		else {
			pattern.append("?3");
		}
		pattern.append(")");
		return pattern.toString();
	}

	@Override
	public String timestampdiffPattern(TemporalUnit unit, TemporalType fromTemporalType, TemporalType toTemporalType) {
		StringBuilder pattern = new StringBuilder();
		boolean castFrom = fromTemporalType != TemporalType.TIMESTAMP && !unit.isDateUnit();
		boolean castTo = toTemporalType != TemporalType.TIMESTAMP && !unit.isDateUnit();
		switch (unit) {
			case NANOSECOND:
			case NATIVE:
				pattern.append("timestampdiff(sql_tsi_frac_second"); //nanos
				break;
			case WEEK:
				pattern.append("(datediff('day'");
			default:
				pattern.append("datediff('?1'");
		}
		pattern.append(',');
		if (castFrom) {
			pattern.append("cast(?2 as timestamp)");
		}
		else {
			pattern.append("?2");
		}
		pattern.append(',');
		if (castTo) {
			pattern.append("cast(?3 as timestamp)");
		}
		else {
			pattern.append("?3");
		}
		pattern.append(")");
		if ( unit == TemporalUnit.WEEK ) {
			pattern.append( "/7)" );
		}
		return pattern.toString();
	}

	@Override
	public String extractPattern(TemporalUnit unit) {
		if ( unit == TemporalUnit.EPOCH ) {
			return "unix_timestamp(?2)";
		}
		else {
			return super.extractPattern(unit);
		}
	}

	@Override
	public boolean supportsDistinctFromPredicate() {
		return true;
	}

	@Override
	public boolean supportsLockTimeouts() {
		return false;
	}

	@Override
	public String getForUpdateString() {
		return " for update";
	}

	@Override
	public LimitHandler getLimitHandler() {
		return OffsetFetchLimitHandler.INSTANCE;
	}

	// Note: HSQLDB actually supports IF EXISTS before AND after the table name.
	// But as CASCADE has to be after IF EXISTS in case it's after the table name,
	// we put the IF EXISTS before the table name to be able to add CASCADE after.
	@Override
	public boolean supportsIfExistsAfterTableName() {
		return false;
	}

	@Override
	public boolean supportsIfExistsBeforeTableName() {
		return true;
	}

	@Override
	public SequenceSupport getSequenceSupport() {
		return HSQLSequenceSupport.INSTANCE;
	}

	@Override
	public String getQuerySequencesString() {
		return "select * from information_schema.sequences";
	}

	@Override
	public SequenceInformationExtractor getSequenceInformationExtractor() {
		return SequenceInformationExtractorHSQLDBDatabaseImpl.INSTANCE;
	}

	@Override
	public boolean supportsStandardArrays() {
		return true;
	}

	@Override
	public ViolatedConstraintNameExtractor getViolatedConstraintNameExtractor() {
		return EXTRACTOR_20;
	}

	private static final ViolatedConstraintNameExtractor EXTRACTOR_20 =
			// messages may be localized, therefore use the common, non-locale element " table: "
			new TemplatedViolatedConstraintNameExtractor( sqle -> {
				switch ( JdbcExceptionHelper.extractErrorCode( sqle ) ) {
					case -8:
					case -9:
					case -104:
					case -177:
						return extractUsingTemplate(
								"; ", " table: ",
								sqle.getMessage()
						);
				}
				return null;
			} );

	@Override
	public String getSelectClauseNullString(int sqlType, TypeConfiguration typeConfiguration) {
		switch ( sqlType ) {
			case Types.LONGVARCHAR:
			case Types.VARCHAR:
			case Types.CHAR:
				return "cast(null as varchar(100))";
			case Types.LONGVARBINARY:
			case Types.VARBINARY:
			case Types.BINARY:
				return "cast(null as varbinary(100))";
			case Types.CLOB:
				return "cast(null as clob)";
			case Types.BLOB:
				return "cast(null as blob)";
			case Types.DATE:
				return "cast(null as date)";
			case Types.TIMESTAMP:
			case Types.TIMESTAMP_WITH_TIMEZONE:
				return "cast(null as timestamp)";
			case Types.BOOLEAN:
				return "cast(null as boolean)";
			case Types.BIT:
				return "cast(null as bit)";
			case Types.TIME:
				return "cast(null as time)";
			default:
				return "cast(null as int)";
		}
	}

	@Override
	public NullOrdering getNullOrdering() {
		return NullOrdering.FIRST;
	}

	@Override
	public SqmMultiTableMutationStrategy getFallbackSqmMutationStrategy(
			EntityMappingType rootEntityDescriptor,
			RuntimeModelCreationContext runtimeModelCreationContext) {

		// Hibernate uses this information for temporary tables that it uses for its own operations
		// therefore the appropriate strategy is taken with different versions of HSQLDB

		// All versions of HSQLDB support GLOBAL TEMPORARY tables where the table
		// definition is shared by all users but data is private to the session
		// HSQLDB 2.0 also supports session-based LOCAL TEMPORARY tables where
		// the definition and data is private to the session and table declaration
		// can happen in the middle of a transaction

		return new LocalTemporaryTableMutationStrategy(
				// With HSQLDB 2.0, the table name is qualified with SESSION to assist the drop
				// statement (in-case there is a global name beginning with HT_)
				TemporaryTable.createIdTable(
						rootEntityDescriptor,
						basename -> "session." + TemporaryTable.ID_TABLE_PREFIX + basename,
						this,
						runtimeModelCreationContext
				),
				runtimeModelCreationContext.getSessionFactory()
		);
	}

	@Override
	public SqmMultiTableInsertStrategy getFallbackSqmInsertStrategy(
			EntityMappingType rootEntityDescriptor,
			RuntimeModelCreationContext runtimeModelCreationContext) {

		// Hibernate uses this information for temporary tables that it uses for its own operations
		// therefore the appropriate strategy is taken with different versions of HSQLDB

		// All versions of HSQLDB support GLOBAL TEMPORARY tables where the table
		// definition is shared by all users but data is private to the session
		// HSQLDB 2.0 also supports session-based LOCAL TEMPORARY tables where
		// the definition and data is private to the session and table declaration
		// can happen in the middle of a transaction

		return new LocalTemporaryTableInsertStrategy(
				// With HSQLDB 2.0, the table name is qualified with SESSION to assist the drop
				// statement (in-case there is a global name beginning with HT_)
				TemporaryTable.createEntityTable(
						rootEntityDescriptor,
						name -> "session." + TemporaryTable.ENTITY_TABLE_PREFIX + name,
						this,
						runtimeModelCreationContext
				),
				runtimeModelCreationContext.getSessionFactory()
		);
	}

	@Override
	public TemporaryTableKind getSupportedTemporaryTableKind() {
		return TemporaryTableKind.LOCAL;
	}

	@Override
	public String getTemporaryTableCreateCommand() {
		return "declare local temporary table";
	}

	@Override
	public AfterUseAction getTemporaryTableAfterUseAction() {
		return AfterUseAction.DROP;
	}

	@Override
	public BeforeUseAction getTemporaryTableBeforeUseAction() {
		return BeforeUseAction.CREATE;
	}

	// current timestamp support ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

	@Override
	public boolean supportsCurrentTimestampSelection() {
		return true;
	}

	@Override
	public boolean isCurrentTimestampSelectStringCallable() {
		return false;
	}

	@Override
	public String getCurrentTimestampSelectString() {
		return "values current_timestamp";
	}

	@Override
	public boolean supportsCommentOn() {
		return true;
	}

	// Overridden informational metadata ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

	@Override
	public boolean doesReadCommittedCauseWritersToBlockReaders() {
		return true;
	}

	@Override
	public boolean doesRepeatableReadCauseReadersToBlockWriters() {
		return true;
	}

	@Override
	public boolean supportsLobValueChangePropagation() {
		return false;
	}

	@Override
	public void appendBooleanValueString(SqlAppender appender, boolean bool) {
		appender.appendSql( bool );
	}

	@Override
	public boolean supportsTupleCounts() {
		return true;
	}

	@Override
	public boolean supportsTupleDistinctCounts() {
		// 2.2.9 is added support for COUNT(DISTINCT ...) with multiple arguments
		return true;
	}

	@Override
	public boolean supportsOffsetInSubquery() {
		return true;
	}

	@Override
	public boolean supportsLateral() {
		return true;
	}

	@Override
	public boolean supportsRecursiveCTE() {
		return getVersion().isSameOrAfter( 2 );
	}

	@Override
	public boolean requiresFloatCastingOfIntegerDivision() {
		return true;
	}

	@Override
	public IdentityColumnSupport getIdentityColumnSupport() {
		return identityColumnSupport;
	}

	@Override
	public NameQualifierSupport getNameQualifierSupport() {
		return NameQualifierSupport.SCHEMA;
	}

	@Override
	public boolean supportsNamedParameters(DatabaseMetaData databaseMetaData) {
		return false;
	}

	// Do not drop constraints explicitly, just do this by cascading instead.
	@Override
	public boolean dropConstraints() {
		return false;
	}

	@Override
	public String getCascadeConstraintsString() {
		return " cascade ";
	}

	@Override
	public void appendDatetimeFormat(SqlAppender appender, String format) {
		appender.appendSql(
				OracleDialect.datetimeFormat( format, false, false )
				// HSQL is case-sensitive i.e. requires MONTH and DAY instead of Month and Day
				.replace("MMMM", "MONTH")
				.replace("EEEE", "DAY")
				.replace("SSSSSS", "FF")
				.replace("SSSSS", "FF")
				.replace("SSSS", "FF")
				.replace("SSS", "FF")
				.replace("SS", "FF")
				.replace("S", "FF")
				.result()
		);
	}

	@Override
	public String translateExtractField(TemporalUnit unit) {
		//TODO: does not support MICROSECOND, but on the
		//      other hand it doesn't support microsecond
		//      precision in timestamps either so who cares?
		switch (unit) {
			case WEEK: return "week_of_year"; //this is the ISO week number, I believe
			default: return unit.toString();
		}
	}

	@Override
	public IdentifierHelper buildIdentifierHelper(IdentifierHelperBuilder builder, DatabaseMetaData dbMetaData)
			throws SQLException {
		builder.setAutoQuoteInitialUnderscore( true );
		return super.buildIdentifierHelper( builder, dbMetaData );
	}

	@Override
	public UniqueDelegate getUniqueDelegate() {
		return uniqueDelegate;
	}
}