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/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.trino.connector.system.jdbc;

import com.google.inject.Inject;
import io.airlift.slice.Slices;
import io.trino.FullConnectorSession;
import io.trino.Session;
import io.trino.metadata.Metadata;
import io.trino.metadata.QualifiedTablePrefix;
import io.trino.security.AccessControl;
import io.trino.spi.connector.ConnectorSession;
import io.trino.spi.connector.ConnectorTableMetadata;
import io.trino.spi.connector.ConnectorTransactionHandle;
import io.trino.spi.connector.InMemoryRecordSet;
import io.trino.spi.connector.InMemoryRecordSet.Builder;
import io.trino.spi.connector.RecordCursor;
import io.trino.spi.connector.SchemaTableName;
import io.trino.spi.predicate.Domain;
import io.trino.spi.predicate.TupleDomain;

import java.util.Optional;
import java.util.Set;

import static io.trino.connector.system.jdbc.FilterUtil.isImpossibleObjectName;
import static io.trino.connector.system.jdbc.FilterUtil.tablePrefix;
import static io.trino.connector.system.jdbc.FilterUtil.tryGetSingleVarcharValue;
import static io.trino.metadata.MetadataListing.listCatalogNames;
import static io.trino.metadata.MetadataListing.listTables;
import static io.trino.metadata.MetadataListing.listViews;
import static io.trino.metadata.MetadataUtil.TableMetadataBuilder.tableMetadataBuilder;
import static io.trino.spi.type.VarcharType.VARCHAR;
import static java.util.Objects.requireNonNull;

public class TableJdbcTable
        extends JdbcTable
{
    public static final SchemaTableName NAME = new SchemaTableName("jdbc", "tables");

    public static final ConnectorTableMetadata METADATA = tableMetadataBuilder(NAME)
            .column("table_cat", VARCHAR)
            .column("table_schem", VARCHAR)
            .column("table_name", VARCHAR)
            .column("table_type", VARCHAR)
            .column("remarks", VARCHAR)
            .column("type_cat", VARCHAR)
            .column("type_schem", VARCHAR)
            .column("type_name", VARCHAR)
            .column("self_referencing_col_name", VARCHAR)
            .column("ref_generation", VARCHAR)
            .build();

    private final Metadata metadata;
    private final AccessControl accessControl;

    @Inject
    public TableJdbcTable(Metadata metadata, AccessControl accessControl)
    {
        this.metadata = requireNonNull(metadata, "metadata is null");
        this.accessControl = requireNonNull(accessControl, "accessControl is null");
    }

    @Override
    public ConnectorTableMetadata getTableMetadata()
    {
        return METADATA;
    }

    @Override
    public RecordCursor cursor(ConnectorTransactionHandle transactionHandle, ConnectorSession connectorSession, TupleDomain constraint)
    {
        Builder table = InMemoryRecordSet.builder(METADATA);
        Session session = ((FullConnectorSession) connectorSession).getSession();

        Domain catalogDomain = constraint.getDomain(0, VARCHAR);
        Domain schemaDomain = constraint.getDomain(1, VARCHAR);
        Domain tableDomain = constraint.getDomain(2, VARCHAR);
        Domain typeDomain = constraint.getDomain(3, VARCHAR);

        if (isImpossibleObjectName(catalogDomain) || isImpossibleObjectName(schemaDomain) || isImpossibleObjectName(tableDomain)) {
            return table.build().cursor();
        }

        Optional schemaFilter = tryGetSingleVarcharValue(schemaDomain);
        Optional tableFilter = tryGetSingleVarcharValue(tableDomain);

        boolean includeTables = typeDomain.includesNullableValue(Slices.utf8Slice("TABLE"));
        boolean includeViews = typeDomain.includesNullableValue(Slices.utf8Slice("VIEW"));
        if (!includeTables && !includeViews) {
            return table.build().cursor();
        }

        for (String catalog : listCatalogNames(session, metadata, accessControl, catalogDomain)) {
            QualifiedTablePrefix prefix = tablePrefix(catalog, schemaFilter, tableFilter);

            Set views = listViews(session, metadata, accessControl, prefix);
            for (SchemaTableName name : listTables(session, metadata, accessControl, prefix)) {
                boolean isView = views.contains(name);
                if ((includeTables && !isView) || (includeViews && isView)) {
                    table.addRow(tableRow(catalog, name, isView ? "VIEW" : "TABLE"));
                }
            }
        }
        return table.build().cursor();
    }

    private static Object[] tableRow(String catalog, SchemaTableName name, String type)
    {
        return new Object[] {catalog, name.getSchemaName(), name.getTableName(), type,
                null, null, null, null, null, null};
    }
}