/*
 * Copyright DataStax, Inc.
 *
 * 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 com.datastax.driver.core.schemabuilder;

import com.google.common.base.Joiner;
import com.google.common.base.Optional;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * A built CREATE TYPE statement.
 */
public class CreateType extends AbstractCreateStatement<CreateType> {

    private String typeName;

    CreateType(String keyspaceName, String typeName) {
        validateNotEmpty(keyspaceName, "Keyspace name");
        validateNotEmpty(typeName, "Custom type name");
        validateNotKeyWord(keyspaceName, String.format("The keyspace name '%s' is not allowed because it is a reserved keyword", keyspaceName));
        validateNotKeyWord(typeName, String.format("The custom type name '%s' is not allowed because it is a reserved keyword", typeName));
        this.typeName = typeName;
        this.keyspaceName = Optional.fromNullable(keyspaceName);
    }

    CreateType(String typeName) {
        validateNotEmpty(typeName, "Custom type name");
        validateNotKeyWord(typeName, String.format("The custom type name '%s' is not allowed because it is a reserved keyword", typeName));
        this.typeName = typeName;
    }

    /**
     * Generate the script for custom type creation
     *
     * @return a CREATE TYPE statement
     */
    public String build() {
        return buildInternal();
    }

    @Override
    public String buildInternal() {

        StringBuilder createStatement = new StringBuilder(STATEMENT_START).append("CREATE TYPE ");
        if (ifNotExists) {
            createStatement.append("IF NOT EXISTS ");
        }
        if (keyspaceName.isPresent()) {
            createStatement.append(keyspaceName.get()).append(".");
        }
        createStatement.append(typeName);

        List<String> allColumns = new ArrayList<String>();
        for (Map.Entry<String, ColumnType> entry : simpleColumns.entrySet()) {
            allColumns.add(buildColumnType(entry));
        }

        createStatement.append("(").append(COLUMN_FORMATTING);
        createStatement.append(Joiner.on("," + COLUMN_FORMATTING).join(allColumns));
        createStatement.append(")");

        return createStatement.toString();
    }
}
