/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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 org.elasticsearch.rest;

import static org.elasticsearch.common.unit.ByteSizeValue.parseBytesSizeValue;
import static org.elasticsearch.common.unit.TimeValue.parseTimeValue;

import java.net.SocketAddress;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Map;
import java.util.StringTokenizer;

import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.dht.Range;
import org.apache.cassandra.dht.Token;
import org.elasticsearch.common.Booleans;
import org.elasticsearch.common.ContextAndHeaderHolder;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.unit.ByteSizeValue;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.xcontent.ToXContent;
import org.elasticsearch.rest.support.RestUtils;

/**
 *
 */
public abstract class RestRequest extends ContextAndHeaderHolder implements ToXContent.Params {

    public enum Method {
        GET, POST, PUT, DELETE, OPTIONS, HEAD
    }

    public abstract Method method();

    /**
     * The uri of the rest request, with the query string.
     */
    public abstract String uri();

    /**
     * The non decoded, raw path provided.
     */
    public abstract String rawPath();

    /**
     * The path part of the URI (without the query string), decoded.
     */
    public final String path() {
        return RestUtils.decodeComponent(rawPath());
    }

    public abstract boolean hasContent();

    public abstract BytesReference content();

    public abstract String header(String name);

    public abstract Iterable<Map.Entry<String, String>> headers();

    @Nullable
    public SocketAddress getRemoteAddress() {
        return null;
    }

    @Nullable
    public SocketAddress getLocalAddress() {
        return null;
    }

    public abstract boolean hasParam(String key);

    @Override
    public abstract String param(String key);

    public abstract Map<String, String> params();

    public float paramAsFloat(String key, float defaultValue) {
        String sValue = param(key);
        if (sValue == null) {
            return defaultValue;
        }
        try {
            return Float.parseFloat(sValue);
        } catch (NumberFormatException e) {
            throw new IllegalArgumentException("Failed to parse float parameter [" + key + "] with value [" + sValue + "]", e);
        }
    }

    public int paramAsInt(String key, int defaultValue) {
        String sValue = param(key);
        if (sValue == null) {
            return defaultValue;
        }
        try {
            return Integer.parseInt(sValue);
        } catch (NumberFormatException e) {
            throw new IllegalArgumentException("Failed to parse int parameter [" + key + "] with value [" + sValue + "]", e);
        }
    }

    public long paramAsLong(String key, long defaultValue) {
        String sValue = param(key);
        if (sValue == null) {
            return defaultValue;
        }
        try {
            return Long.parseLong(sValue);
        } catch (NumberFormatException e) {
            throw new IllegalArgumentException("Failed to parse long parameter [" + key + "] with value [" + sValue + "]", e);
        }
    }

    @Override
    public boolean paramAsBoolean(String key, boolean defaultValue) {
        return Booleans.parseBoolean(param(key), defaultValue);
    }

    @Override
    public Boolean paramAsBoolean(String key, Boolean defaultValue) {
        return Booleans.parseBoolean(param(key), defaultValue);
    }

    public TimeValue paramAsTime(String key, TimeValue defaultValue) {
        return parseTimeValue(param(key), defaultValue, key);
    }

    public ByteSizeValue paramAsSize(String key, ByteSizeValue defaultValue) {
        return parseBytesSizeValue(param(key), defaultValue, key);
    }

    public String[] paramAsStringArray(String key, String[] defaultValue) {
        String value = param(key);
        if (value == null) {
            return defaultValue;
        }
        return Strings.splitStringByCommaToArray(value);
    }

    public String[] paramAsStringArrayOrEmptyIfAll(String key) {
        String[] params = paramAsStringArray(key, Strings.EMPTY_ARRAY);
        if (Strings.isAllOrWildcard(params)) {
            return Strings.EMPTY_ARRAY;
        }
        return params;
    }

    public Collection<Range<Token>> paramsAsTokenRanges(String key) {
        String value = param(key);
        if (value != null) {
            Collection<Range<Token>> tokenRanges = new ArrayList<Range<Token>>();
            Token.TokenFactory tokenFactory = DatabaseDescriptor.getPartitioner().getTokenFactory();
            StringTokenizer stk = new StringTokenizer(value, "{[(,)]}");
            while (stk.hasMoreTokens()) {
                Token leftToken = tokenFactory.fromString(stk.nextToken());
                Token rightToken = tokenFactory.fromString(stk.nextToken());
                tokenRanges.add(new Range(leftToken, rightToken));
            }
            return tokenRanges;
        }
        return null;
    }

}