/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you 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.kcache.kwack.schema;

import io.kcache.kwack.transformer.Context;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Objects;
import org.duckdb.DuckDBColumnType;

public class StructColumnDef extends ColumnDef implements ColumnDefsContainer {
    private final LinkedHashMap<String, ColumnDef> columnDefs;

    public StructColumnDef(LinkedHashMap<String, ColumnDef> columnDefs) {
        this(columnDefs, ColumnStrategy.NOT_NULL_STRATEGY);
    }

    public StructColumnDef(
        LinkedHashMap<String, ColumnDef> columnDefs, ColumnStrategy columnStrategy) {
        super(DuckDBColumnType.STRUCT, columnStrategy);
        this.columnDefs = columnDefs;
    }

    @Override
    public LinkedHashMap<String, ColumnDef> getColumnDefs() {
        return columnDefs;
    }

    @Override
    public String toDdl(Context ctx) {
        if (columnDefs.isEmpty()) {
            throw new IllegalArgumentException("Struct column definitions cannot be empty");
        }
        if (!ctx.visit(this)) {
            throw new IllegalArgumentException("Struct column definitions cannot be recursive");
        }
        try {
            StringBuilder sb = new StringBuilder(columnType.name());
            sb.append("(");
            int i = 0;
            for (Map.Entry<String, ColumnDef> entry : columnDefs.entrySet()) {
                String name = entry.getKey();
                ColumnDef columnDef = entry.getValue();
                sb.append("\"");
                sb.append(name);
                sb.append("\" ");
                sb.append(columnDef.toDdl(ctx));
                if (i < columnDefs.size() - 1) {
                    sb.append(", ");
                }
                i++;
            }
            sb.append(")");
            return sb.toString();
        } finally {
            ctx.leave(this);
        }
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        if (!super.equals(o)) {
            return false;
        }
        StructColumnDef that = (StructColumnDef) o;
        return Objects.equals(columnDefs, that.columnDefs);
    }

    @Override
    public int hashCode() {
        return Objects.hash(super.hashCode(), columnDefs);
    }
}
