/*
 * Copyright 2012 astamuse company,Ltd.
 * 
 * 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 com.astamuse.asta4d.web.dispatch;

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

import com.astamuse.asta4d.web.copyleft.SpringAntPathMatcher;
import com.astamuse.asta4d.web.dispatch.HttpMethod.ExtendHttpMethod;
import com.astamuse.asta4d.web.dispatch.mapping.UrlMappingResult;
import com.astamuse.asta4d.web.dispatch.mapping.UrlMappingRule;

/**
 * Use the spring mvc ant path matching rule to find matched rule. <br>
 * 
 * @author e-ryu
 * 
 */
public class AntPathRuleMatcher implements DispatcherRuleMatcher {

    private SpringAntPathMatcher pathMatcher = new SpringAntPathMatcher();

    @Override
    public UrlMappingResult match(UrlMappingRule rule, HttpMethod method, ExtendHttpMethod extendMethod, String uri, String queryString) {
        UrlMappingResult mappingResult = null;

        if (matchMethod(rule, method, extendMethod)) {
            if (matchPath(rule, uri)) {
                mappingResult = new UrlMappingResult();
                mappingResult.setPathVarMap(variables(rule, uri));
                mappingResult.setRule(rule);
            }
        }

        return mappingResult;
    }

    protected boolean matchMethod(UrlMappingRule rule, HttpMethod method, ExtendHttpMethod extendMethod) {
        HttpMethod ruleMethod = rule.getMethod();

        if (ruleMethod == null) {
            return true;// match all
        }

        if (ruleMethod != method) {
            return false;
        }

        if (method == HttpMethod.UNKNOWN) {
            ExtendHttpMethod ruleExtendMethod = rule.getExtendMethod();
            if (ruleExtendMethod == null) {
                return true; // match all extend method
            } else {
                return ruleExtendMethod.equals(extendMethod);
            }
        } else {
            return true;// method macthed
        }

    }

    protected boolean matchPath(UrlMappingRule rule, String uri) {
        return pathMatcher.match(rule.getSourcePath(), uri);
    }

    protected Map<String, Object> variables(UrlMappingRule rule, String uri) {
        Map<String, Object> pathVarMap = new HashMap<>();

        pathVarMap.putAll(pathMatcher.extractUriTemplateVariables(rule.getSourcePath(), uri));
        return pathVarMap;
    }
}