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/*
 * Copyright (c) 2008-2019 The Aspectran Project
 *
 * 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.aspectran.undertow.server.resource;

import com.aspectran.core.util.logging.Log;
import com.aspectran.core.util.logging.LogFactory;
import com.aspectran.core.util.wildcard.PluralWildcardPattern;
import com.aspectran.core.util.wildcard.WildcardPattern;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import io.undertow.server.handlers.resource.PathResourceManager;
import io.undertow.server.handlers.resource.ResourceHandler;
import io.undertow.server.handlers.resource.ResourceManager;
import io.undertow.server.handlers.resource.ResourceSupplier;

import java.io.IOException;
import java.nio.file.DirectoryStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Arrays;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Set;

public class StaticResourceHandler extends ResourceHandler {

    private static final Log log = LogFactory.getLog(StaticResourceHandler.class);

    private volatile PluralWildcardPattern resourcePathPatterns;

    public StaticResourceHandler(ResourceManager resourceManager) {
        super(resourceManager);
    }

    public StaticResourceHandler(ResourceManager resourceManager, HttpHandler next) {
        super(resourceManager, next);
    }

    public StaticResourceHandler(ResourceSupplier resourceSupplier) {
        super(resourceSupplier);
    }

    public StaticResourceHandler(ResourceSupplier resourceSupplier, HttpHandler next) {
        super(resourceSupplier, next);
    }

    public void setResourcePathPatterns(ResourcePathPatterns resourcePathPatterns) {
        String[] includePatterns = resourcePathPatterns.getIncludePatterns();
        String[] excludePatterns = resourcePathPatterns.getExcludePatterns();
        this.resourcePathPatterns = new PluralWildcardPattern(includePatterns, excludePatterns, '/');
    }

    public void autoDetect() throws IOException {
        if (getResourceManager() instanceof PathResourceManager) {
            Path base = ((PathResourceManager)getResourceManager()).getBasePath();
            Set dirs = new HashSet<>();
            try (DirectoryStream stream = Files.newDirectoryStream(base)) {
                for (Path path : stream) {
                    if (Files.isDirectory(path)) {
                        dirs.add("/" + path.getFileName().toString() + "/");
                    }
                }
            }
            Set patterns = new LinkedHashSet<>();
            if (resourcePathPatterns != null && resourcePathPatterns.hasIncludePatterns()) {
                for (WildcardPattern pattern : resourcePathPatterns.getIncludePatterns()) {
                    boolean exists = false;
                    for (String prefix : dirs) {
                        if (pattern.toString().startsWith(prefix)) {
                            exists = true;
                            break;
                        }
                    }
                    if (!exists) {
                        patterns.add(pattern);
                    }
                }
            }
            for (String prefix : dirs) {
                patterns.add(WildcardPattern.compile(prefix + "**", '/'));
            }
            if (patterns.isEmpty()) {
                resourcePathPatterns = null;
            } else {
                WildcardPattern[] includePatterns = patterns.toArray(new WildcardPattern[0]);
                WildcardPattern[] excludePatterns = (resourcePathPatterns != null ? resourcePathPatterns.getExcludePatterns() : null);
                resourcePathPatterns = new PluralWildcardPattern(includePatterns, excludePatterns);

                if (log.isDebugEnabled()) {
                    log.debug("StaticResourceHandler includePatterns=" + Arrays.toString(includePatterns));
                    if (excludePatterns != null) {
                        log.debug("StaticResourceHandler excludePatterns=" + Arrays.toString(excludePatterns));
                    }
                }
            }
        }
    }

    public boolean hasPatterns() {
        return (resourcePathPatterns != null);
    }

    @Override
    public void handleRequest(HttpServerExchange exchange) throws Exception {
        String requestPath = exchange.getRequestPath();
        if (resourcePathPatterns != null) {
            if (resourcePathPatterns.matches(requestPath)) {
                super.handleRequest(exchange);
            }
        }
    }

}