/*******************************************************************************
 * Copyright 2011-2013 Sergey Tarasevich
 *
 * 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 cn.link.imageloader.download;


import cn.link.imageloader.DisplayOptions;

import java.io.IOException;
import java.io.InputStream;


public interface ImageDownloader {
    InputStream getStream(String imageUri, DisplayOptions options) throws IOException;

    public enum Scheme {
        HTTP("http"),
        HTTPS("https"),
        FILE("file"),
        CONTENT("content"),
        ASSETS("assets"),
        DRAWABLE("drawable"),
        UNKNOWN("");

        private String scheme;
        private String uriPrefix;

        Scheme(String scheme) {
            this.scheme = scheme;
            uriPrefix = scheme + "://";
        }

        public static Scheme ofUri(String uri) {
            if (uri != null) {
                for (Scheme s : values()) {
                    if (s.belongsTo(uri)) {
                        return s;
                    }
                }
            }
            return UNKNOWN;
        }

        private boolean belongsTo(String uri) {
            return uri.startsWith(uriPrefix);
        }

        public String wrap(String path) {
            return uriPrefix + path;
        }

        public String crop(String uri) {
            if (!belongsTo(uri)) {
                throw new IllegalArgumentException(String.format("URI [%1$s] doesn't have expected scheme [%2$s]", uri, scheme));
            }
            return uri.substring(uriPrefix.length());
        }
    }
}