/*
 * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */

package build.tools.cldrconverter;

import java.io.File;
import java.io.IOException;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

/**
 * Handles parsing of dayPeriods.xml for day period rules.
 */

class DayPeriodRuleParseHandler extends AbstractLDMLHandler<Map<String, String>> {

    @Override
    public InputSource resolveEntity(String publicID, String systemID) throws IOException, SAXException {
        // avoid HTTP traffic to unicode.org
        if (systemID.startsWith(CLDRConverter.SPPL_LDML_DTD_SYSTEM_ID)) {
            return new InputSource((new File(CLDRConverter.LOCAL_SPPL_LDML_DTD)).toURI().toString());
        }
        return null;
    }

    @Override
    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
        switch (qName) {
            case "dayPeriodRuleSet":
                if (attributes.getValue("type") != null) {
                    // ignore "selection"
                    pushIgnoredContainer(qName);
                } else {
                    pushContainer(qName, attributes);
                }
                break;
            case "dayPeriodRules":
                if (!isIgnored(attributes)) {
                    pushKeyContainer(qName, attributes, attributes.getValue("locales"));
                } else {
                    pushIgnoredContainer(qName);
                }
                break;
        case "dayPeriodRule":
            if (!isIgnored(attributes) && currentContainer instanceof KeyContainer) {
                String at = attributes.getValue("at");
                String from = attributes.getValue("from");
                String before = attributes.getValue("before");
                String output = "";
                if (at == null || at.isEmpty()) {
                    output = from + "-" + before;
                } else {
                    output = at;
                }
                pushStringEntry(qName, attributes, attributes.getValue("type"), output);
            } else {
                pushIgnoredContainer(qName);
            }
            break;
        default:
            // treat anything else as a container
            pushContainer(qName, attributes);
            break;
        }
    }

    @Override
        public void endElement(String uri, String localName, String qName) throws SAXException {
            assert qName.equals(currentContainer.getqName()) : "current=" + currentContainer.getqName() + ", param=" + qName;
            switch (qName) {
                case "dayPeriodRule":
                    if (currentContainer instanceof Entry) {
                        Entry<?> entry = (Entry<?>) currentContainer;
                        final String type = entry.getKey();
                        final String rule = (String) entry.getValue();
                        String locales = ((KeyContainer) (currentContainer.getParent())).getKey();
                        Arrays.stream(locales.split("\\s"))
                            .forEach(loc -> {
                                Map<String, String> rules = get(loc);
                                if (rules == null) {
                                    rules = new HashMap<>();
                                    put(loc, rules);
                                }
                                rules.put(type, rule);
                            });
                    }
                    break;
            }

            currentContainer = currentContainer.getParent();
        }
}