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/*
 * Copyright (c) 2008-2020 the original author or authors.
 *
 * 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 org.cometd.websocket.server.common;

import java.net.HttpCookie;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.List;

/**
 *  A parser for "Cookie" headers.
 * Class {@link HttpCookie} parses "Set-Cookie" headers, which have a different format,
 * and Servlet's {@code Cookie} class does not have parsing facilities.
 */
public class CookieParser {
    private CookieParser() {
    }

    public static List parse(String header) throws ParseException {
        List cookies = new ArrayList<>();
        State state = State.NAME;
        String name = null;
        int begin = 0;
        boolean quoted = false;

        for (int end = 0; end < header.length(); ++end) {
            char ch = header.charAt(end);
            switch (state) {
                case NAME: {
                    if (ch == '$') {
                        state = State.SEPARATOR;
                    } else if (ch == '=') {
                        name = header.substring(begin, end).trim();
                        if (name.length() == 0) {
                            throw new ParseException(header, end);
                        }
                        state = State.VALUE;
                        begin = end + 1;
                    }
                    break;
                }
                case VALUE: {
                    // Skip initial whitespace.
                    if (Character.isWhitespace(ch) && begin == end) {
                        begin = end + 1;
                        break;
                    }

                    switch (ch) {
                        case '"': {
                            if (quoted) {
                                String value = header.substring(begin, end).trim();
                                cookies.add(new HttpCookie(name, value));
                                state = State.SEPARATOR;
                                name = null;
                                quoted = false;
                            } else {
                                quoted = true;
                                begin = end + 1;
                            }
                            break;
                        }
                        case ';': {
                            if (!quoted) {
                                String value = header.substring(begin, end).trim();
                                cookies.add(new HttpCookie(name, value));
                                state = State.NAME;
                                name = null;
                                begin = end + 1;
                            }
                            break;
                        }
                        default: {
                            if (end + 1 == header.length()) {
                                if (quoted) {
                                    throw new ParseException(header, begin);
                                }
                                String value = header.substring(begin, end + 1).trim();
                                cookies.add(new HttpCookie(name, value));
                            }
                            break;
                        }
                    }
                    break;
                }
                case SEPARATOR: {
                    if (ch == ';') {
                        state = State.NAME;
                        name = null;
                        begin = end + 1;
                    }
                    break;
                }
            }
        }
        return cookies;
    }

    private enum State {
        NAME, VALUE, SEPARATOR
    }
}