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/*-
 * #%L
 * rapidoid-http-fast
 * %%
 * Copyright (C) 2014 - 2017 Nikolche Mihajlovski and contributors
 * %%
 * 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.
 * #L%
 */

package org.rapidoid.http.impl;

import org.rapidoid.RapidoidThing;
import org.rapidoid.annotation.Authors;
import org.rapidoid.annotation.Since;
import org.rapidoid.cls.Cls;
import org.rapidoid.commons.Str;
import org.rapidoid.lambda.Mapper;
import org.rapidoid.u.U;
import org.rapidoid.util.Msc;

import java.lang.reflect.Method;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


@Authors("Nikolche Mihajlovski")
@Since("5.1.0")
public class PathPattern extends RapidoidThing implements Comparable {

	public static final String ANY = "_";

	public static final Pattern PATH_PARAM_REGEX = Pattern.compile("\\{([^\\}]+)\\}");

	private static final Pattern PATH_PARAM_PARTS = Pattern.compile("(\\w+)(?::(.+))?");

	private static final String DEFAULT_GROUP_REGEX = "[^/]+";

	private static final Method MATCHER_GROUP;

	static {
		MATCHER_GROUP = Cls.findMethod(Matcher.class, "group", String.class);
	}

	private final String path;

	private final Pattern pattern;

	private final Map groups;

	public PathPattern(String path, Pattern pattern, Map groups) {
		this.path = path;
		this.pattern = pattern;
		this.groups = groups;
	}

	public static PathPattern from(String path) {
		final Map groups = U.map();
		final AtomicInteger counter = new AtomicInteger();

		String regex = Str.replace(path, PATH_PARAM_REGEX, new Mapper() {
			@Override
			public String map(String[] gr) throws Exception {
				return toPathParamRegex(groups, counter, gr[1]);
			}
		});

		if (regex.equals("/*")) {
			regex = "/" + toPathParamRegex(groups, counter, ANY, ".*");

		} else if (regex.endsWith("/*")) {
			regex = Str.trimr(regex, "/*");
			regex += U.frmt("(?:/%s)?", toPathParamRegex(groups, counter, ANY, ".*"));
		}

		Pattern pattern = Pattern.compile(regex);
		return new PathPattern(path, pattern, groups);
	}

	private static String toPathParamRegex(Map groups, AtomicInteger counter, String group) {
		Matcher m = PATH_PARAM_PARTS.matcher(group);
		U.must(m.matches(), "Invalid path parameter, expected {var} or {var:regex} syntax!");

		String name = m.group(1);
		String regex = U.or(m.group(2), DEFAULT_GROUP_REGEX);

		return toPathParamRegex(groups, counter, name, regex);
	}

	private static String toPathParamRegex(Map groups, AtomicInteger counter, String name, String regex) {
		String groupId = "g" + counter.incrementAndGet();

		U.must(!groups.containsKey(name), "Cannot have multiple path parameters with the same name: '%s'", name);
		groups.put(name, groupId);

		if (!groups.isEmpty()) {
			U.must(MATCHER_GROUP != null, "Named Regex groups are supported starting from JDK 7!");
		}

		return "(?<" + groupId + ">" + regex + ")";
	}

	@Override
	public boolean equals(Object o) {
		if (this == o)
			return true;
		if (o == null || getClass() != o.getClass())
			return false;

		PathPattern that = (PathPattern) o;

		return path.equals(that.path);
	}

	@Override
	public int hashCode() {
		return path.hashCode();
	}

	public String getPath() {
		return path;
	}

	public Pattern getPattern() {
		return pattern;
	}

	public Map match(String path) {
		Matcher matcher = pattern.matcher(path);
		boolean matches = matcher.matches();
		Map params = null;

		if (matches) {
			params = U.map();

			for (Map.Entry e : groups.entrySet()) {
				U.notNull(MATCHER_GROUP != null, "Regex matcher");

				String val = Cls.invoke(MATCHER_GROUP, matcher, e.getValue());

				if (val != null) {
					val = Msc.urlDecodeOrKeepOriginal(val);
					params.put(e.getKey(), val);
				}
			}
		}

		return params;
	}

	@Override
	public String toString() {
		return "PathPattern{" + "path='" + path + '\'' + ", pattern=" + pattern + ", groups=" + groups + '}';
	}

	@Override
	public int compareTo(PathPattern that) {
		int lengthDiff = -(this.prefix().length() - that.prefix().length());
		return lengthDiff != 0 ? lengthDiff : this.path.compareTo(that.path);
	}

	public String prefix() {
		String simplifiedPattern = Str.replace(path, PATH_PARAM_REGEX, new Mapper() {
			@Override
			public String map(String[] gr) throws Exception {
				return "*";
			}
		});

		String prefix = Str.cutToFirst(simplifiedPattern, "*");

		U.must(prefix != null, "Couldn't find pattern segments in the path pattern: %s", path);
		return prefix;
	}

	public static boolean isPattern(String path) {
		return path.contains("*") || path.contains("{");
	}
}