/**
 * Copyright (c) 2015, biezhi 王爵 (biezhi.me@gmail.com)
 * <p>
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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 com.blade.mvc.http;

import com.blade.kit.CollectionKit;
import com.blade.kit.StringKit;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.List;

/**
 * Path URL
 *
 * @author <a href="mailto:biezhi.me@gmail.com" target="_blank">biezhi</a>
 * @since 1.5
 */
public final class Path {

    public static final String VAR_REGEXP = ":(\\w+)";
    public static final String VAR_REPLACE = "([^#/?.]+)";
    public static final String SLASH = "/";

    public static String getRelativePath(String path, String contextPath) {
        contextPath = null == contextPath ? "" : contextPath;
        path = path.substring(contextPath.length());

        if (path.length() > 0) {
            path = path.substring(1);
        }

        if (!path.startsWith(SLASH)) {
            path = SLASH + path;
        }

        try {
            path = URLDecoder.decode(path, "UTF-8");
        } catch (UnsupportedEncodingException ex) {
        }
        return path;
    }

    public static List<String> convertRouteToList(String route) {
        String[] pathArray = StringKit.split(route, "/");
        if (null != pathArray && pathArray.length > 0) {
            List<String> path = CollectionKit.newArrayList();
            for (String p : pathArray) {
                if (p.length() > 0) {
                    path.add(p);
                }
            }
            return path;
        }
        return CollectionKit.newArrayList(0);
    }

    public static boolean isParam(String routePart) {
        return routePart.startsWith(":");
    }

    public static boolean isSplat(String routePart) {
        return routePart.equals("*");
    }

    public static String fixPath(String path) {
        if (path == null) {
            return "/";
        }
        if (!path.startsWith("/")) {
            path = "/" + path;
        }
        if (path.length() > 1 && path.endsWith("/")) {
            path = path.substring(0, path.length() - 1);
        }
        path = path.replaceAll("\\s", "%20");
        return path;
    }

    public static String cleanPath(String path) {
        if (path == null) {
            return null;
        }
        return path.replaceAll("[/]+", "/");
    }

}