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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.metadata;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.errorprone.annotations.Immutable;
import io.trino.spi.connector.SchemaTablePrefix;

import java.util.Objects;
import java.util.Optional;

import static com.google.common.base.Verify.verify;
import static io.trino.metadata.MetadataUtil.checkCatalogName;
import static io.trino.metadata.MetadataUtil.checkSchemaName;
import static io.trino.metadata.MetadataUtil.checkTableName;

@Immutable
public class QualifiedTablePrefix
{
    private final String catalogName;
    private final Optional schemaName;
    private final Optional tableName;

    public QualifiedTablePrefix(String catalogName)
    {
        this.catalogName = checkCatalogName(catalogName);
        this.schemaName = Optional.empty();
        this.tableName = Optional.empty();
    }

    public QualifiedTablePrefix(String catalogName, String schemaName)
    {
        this.catalogName = checkCatalogName(catalogName);
        this.schemaName = Optional.of(checkSchemaName(schemaName));
        this.tableName = Optional.empty();
    }

    public QualifiedTablePrefix(String catalogName, String schemaName, String tableName)
    {
        this.catalogName = checkCatalogName(catalogName);
        this.schemaName = Optional.of(checkSchemaName(schemaName));
        this.tableName = Optional.of(checkTableName(tableName));
    }

    @JsonCreator
    public QualifiedTablePrefix(
            @JsonProperty("catalogName") String catalogName,
            @JsonProperty("schemaName") Optional schemaName,
            @JsonProperty("tableName") Optional tableName)
    {
        checkTableName(catalogName, schemaName, tableName);
        this.catalogName = catalogName;
        this.schemaName = schemaName;
        this.tableName = tableName;
    }

    @JsonProperty
    public String getCatalogName()
    {
        return catalogName;
    }

    @JsonProperty
    public Optional getSchemaName()
    {
        return schemaName;
    }

    @JsonProperty
    public Optional getTableName()
    {
        return tableName;
    }

    public boolean hasSchemaName()
    {
        return schemaName.isPresent();
    }

    public boolean hasTableName()
    {
        return tableName.isPresent();
    }

    public SchemaTablePrefix asSchemaTablePrefix()
    {
        if (schemaName.isEmpty()) {
            return new SchemaTablePrefix();
        }
        if (tableName.isEmpty()) {
            return new SchemaTablePrefix(schemaName.get());
        }
        return new SchemaTablePrefix(schemaName.get(), tableName.get());
    }

    public Optional asQualifiedObjectName()
    {
        if (tableName.isPresent()) {
            verify(schemaName.isPresent());
            return Optional.of(new QualifiedObjectName(catalogName, schemaName.get(), tableName.get()));
        }

        return Optional.empty();
    }

    public boolean matches(QualifiedObjectName objectName)
    {
        return Objects.equals(catalogName, objectName.catalogName())
                && schemaName.map(schema -> Objects.equals(schema, objectName.schemaName())).orElse(true)
                && tableName.map(table -> Objects.equals(table, objectName.objectName())).orElse(true);
    }

    @Override
    public boolean equals(Object obj)
    {
        if (obj == this) {
            return true;
        }
        if ((obj == null) || (getClass() != obj.getClass())) {
            return false;
        }
        QualifiedTablePrefix o = (QualifiedTablePrefix) obj;
        return Objects.equals(catalogName, o.catalogName) &&
                Objects.equals(schemaName, o.schemaName) &&
                Objects.equals(tableName, o.tableName);
    }

    @Override
    public int hashCode()
    {
        return Objects.hash(catalogName, schemaName, tableName);
    }

    @Override
    public String toString()
    {
        return catalogName + '.' + schemaName.orElse("*") + '.' + tableName.orElse("*");
    }
}