/*
 * Licensed to Crate under one or more contributor license agreements.
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.  Crate 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.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial
 * agreement.
 */

package io.crate.planner;

import com.carrotsearch.hppc.IntHashSet;
import com.carrotsearch.hppc.IntSet;
import com.google.common.collect.Multimap;
import io.crate.metadata.TableIdent;

import java.util.HashMap;
import java.util.Map;
import java.util.TreeMap;

public final class ReaderAllocations {

    private final TreeMap<Integer, String> readerIndices = new TreeMap<>();
    private final Map<String, IntSet> nodeReaders = new HashMap<>();
    private final TreeMap<String, Integer> bases;
    private final Multimap<TableIdent, String> tableIndices;
    private final Map<String, TableIdent> indicesToIdents;

    ReaderAllocations(TreeMap<String, Integer> bases,
                      Map<String, Map<Integer, String>> shardNodes,
                      Multimap<TableIdent, String> tableIndices) {
        this.bases = bases;
        this.tableIndices = tableIndices;
        this.indicesToIdents = new HashMap<>(tableIndices.values().size());
        for (Map.Entry<TableIdent, String> entry : tableIndices.entries()) {
            indicesToIdents.put(entry.getValue(), entry.getKey());
        }
        for (Map.Entry<String, Integer> entry : bases.entrySet()) {
            readerIndices.put(entry.getValue(), entry.getKey());
        }
        for (Map.Entry<String, Map<Integer, String>> entry : shardNodes.entrySet()) {
            Integer base = bases.get(entry.getKey());
            if (base == null) {
                continue;
            }
            for (Map.Entry<Integer, String> nodeEntries : entry.getValue().entrySet()) {
                int readerId = base + nodeEntries.getKey();
                IntSet readerIds = nodeReaders.get(nodeEntries.getValue());
                if (readerIds == null) {
                    readerIds = new IntHashSet();
                    nodeReaders.put(nodeEntries.getValue(), readerIds);
                }
                readerIds.add(readerId);
            }
        }
    }

    public Multimap<TableIdent, String> tableIndices() {
        return tableIndices;
    }

    public TreeMap<Integer, String> indices() {
        return readerIndices;
    }

    public Map<String, IntSet> nodeReaders() {
        return nodeReaders;
    }

    public TreeMap<String, Integer> bases() {
        return bases;
    }

    public Map<String, TableIdent> indicesToIdents() {
        return indicesToIdents;
    }
}