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/*
 * Copyright 2024 Hazelcast Inc.
 *
 * Licensed under the Hazelcast Community License (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://hazelcast.com/hazelcast-community-license
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.hazelcast.jet.sql.impl.connector.infoschema;

import com.hazelcast.jet.json.JsonUtil;
import com.hazelcast.jet.sql.impl.connector.SqlConnector;
import com.hazelcast.jet.sql.impl.connector.SqlConnectorCache;
import com.hazelcast.sql.impl.schema.ConstantTableStatistics;
import com.hazelcast.sql.impl.schema.Mapping;
import com.hazelcast.sql.impl.schema.TableField;
import com.hazelcast.sql.impl.type.QueryDataType;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Optional;
import java.util.Set;
import java.util.TreeMap;
import java.util.function.Function;

import static com.hazelcast.jet.impl.util.Util.uncheckCall;
import static com.hazelcast.sql.impl.QueryUtils.quoteCompoundIdentifier;
import static java.util.Arrays.asList;

/**
 * Table object for the {@code information_schema.mappings} table.
 */
public class MappingsTable extends InfoSchemaTable {

    private static final String NAME = "mappings";

    private static final List FIELDS = asList(
            new TableField("table_catalog", QueryDataType.VARCHAR, false),
            new TableField("table_schema", QueryDataType.VARCHAR, false),
            new TableField("table_name", QueryDataType.VARCHAR, false),
            new TableField("mapping_external_name", QueryDataType.VARCHAR, false),
            new TableField("mapping_type", QueryDataType.VARCHAR, false),
            new TableField("mapping_options", QueryDataType.VARCHAR, false)
    );

    private final String mappingsSchema;
    private final Collection mappings;
    private final Function dataConnectionTypeResolver;
    private final boolean securityEnabled;
    private final SqlConnectorCache sqlConnectorCache;

    public MappingsTable(
            String catalog,
            String schemaName,
            String mappingsSchema,
            Collection mappings,
            SqlConnectorCache sqlConnectorCache,
            Function dataConnectionTypeResolver,
            boolean securityEnabled
    ) {
        super(
                FIELDS,
                catalog,
                schemaName,
                NAME,
                new ConstantTableStatistics(mappings.size())
        );

        this.mappingsSchema = mappingsSchema;
        this.mappings = mappings;
        this.sqlConnectorCache = sqlConnectorCache;
        this.dataConnectionTypeResolver = dataConnectionTypeResolver;
        this.securityEnabled = securityEnabled;
    }

    @Override
    protected List rows() {
        List rows = new ArrayList<>(mappings.size());
        for (Mapping mapping : mappings) {
            Map options;
            if (!securityEnabled) {
                options = mapping.options();
            } else {
                options = new TreeMap<>();
                final SqlConnector sqlConnector = sqlConnectorCache.forType(mapping.connectorType());
                final Set secureConnectorOptions = sqlConnector.nonSensitiveConnectorOptions();
                for (Entry e : mapping.options().entrySet()) {
                    if (secureConnectorOptions.contains(e.getKey())) {
                        options.put(e.getKey(), e.getValue());
                    }
                }
            }
            Object[] row = new Object[]{
                    catalog(),
                    mappingsSchema,
                    mapping.name(),
                    quoteCompoundIdentifier(mapping.externalName()),
                    Optional.ofNullable(mapping.dataConnection())
                            .map(dataConnectionTypeResolver)
                            .orElse(mapping.connectorType()),
                    uncheckCall(() -> JsonUtil.toJson(options))
            };
            rows.add(row);
        }
        return rows;
    }
}