/**
 * Copyright (c) 2008-2009 Andrey Somov
 *
 * 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 org.yaml.snakeyaml.nodes;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.sql.Timestamp;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

@SuppressWarnings("unchecked")
public final class Tags {
    public static final String PREFIX = "tag:yaml.org,2002:";
    public static final String MAP = PREFIX + "map";
    public static final String SEQ = PREFIX + "seq";
    public static final String STR = PREFIX + "str";
    public static final String NULL = PREFIX + "null";
    public static final String BOOL = PREFIX + "bool";
    public static final String TIMESTAMP = PREFIX + "timestamp";
    public static final String FLOAT = PREFIX + "float";
    public static final String INT = PREFIX + "int";
    public static final String BINARY = PREFIX + "binary";
    public static final String OMAP = PREFIX + "omap";
    public static final String PAIRS = PREFIX + "pairs";
    public static final String SET = PREFIX + "set";
    public static final String MERGE = PREFIX + "merge";
    public static final String VALUE = PREFIX + "value";
    public static final String YAML = PREFIX + "yaml";
    public static final Map<String, Set<Class>> COMPATIBILITY_MAP;
    static {
        COMPATIBILITY_MAP = new HashMap<String, Set<Class>>();
        Set<Class> floatSet = new HashSet<Class>();
        floatSet.add(Double.class);
        floatSet.add(Float.class);
        floatSet.add(BigDecimal.class);
        COMPATIBILITY_MAP.put(FLOAT, floatSet);
        //
        Set<Class> intSet = new HashSet<Class>();
        intSet.add(Integer.class);
        intSet.add(Long.class);
        intSet.add(BigInteger.class);
        COMPATIBILITY_MAP.put(INT, intSet);
        //
        Set<Class> timestampSet = new HashSet<Class>();
        timestampSet.add(Date.class);
        timestampSet.add(java.sql.Date.class);
        timestampSet.add(Timestamp.class);
        COMPATIBILITY_MAP.put(TIMESTAMP, timestampSet);
    }

    public static String getGlobalTagForClass(Class<? extends Object> clazz) {
        return PREFIX + clazz.getName();
    }

    // TODO is it the proper place for the code ?
    // TODO should we define the preference which one is created when the
    // runtime class is not known ?
    // TODO choose a better name
    public static boolean areCompatible(String tag, Class clazz) {
        Set<Class> set = COMPATIBILITY_MAP.get(tag);
        if (set != null) {
            return set.contains(clazz);
        } else {
            return false;
        }
    }
}