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//
// Copyright 2010 GOT5 (GO Tapestry 5)
//
// 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.got5.tapestry5.jquery.services.javascript;

import java.text.DateFormatSymbols;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Collections;
import java.util.List;
import java.util.Locale;

import org.apache.tapestry5.Asset;
import org.apache.tapestry5.SymbolConstants;
import org.apache.tapestry5.internal.services.javascript.DateFieldStack;
import org.apache.tapestry5.ioc.Resource;
import org.apache.tapestry5.ioc.annotations.Symbol;
import org.apache.tapestry5.ioc.services.SymbolSource;
import org.apache.tapestry5.ioc.services.ThreadLocale;
import org.apache.tapestry5.ioc.services.TypeCoercer;
import org.apache.tapestry5.json.JSONArray;
import org.apache.tapestry5.json.JSONObject;
import org.apache.tapestry5.services.AssetSource;
import org.apache.tapestry5.services.javascript.JavaScriptStack;
import org.apache.tapestry5.services.javascript.StylesheetLink;
import org.got5.tapestry5.jquery.JQuerySymbolConstants;

/**
 * Replacement for the core stack {@link DateFieldStack}.
 *
 * @author criedel, GOT5
 */
public class JQueryDateFieldStack implements JavaScriptStack
{
    private final ThreadLocale threadLocale;

    private final AssetSource assetSource;

    private final boolean compactJSON;

    private final boolean productionMode;

    private final TypeCoercer typeCoercer;

    private final SymbolSource symbolSource;

    public JQueryDateFieldStack(final ThreadLocale threadLocale,

    @Symbol(SymbolConstants.COMPACT_JSON)
    final boolean compactJSON,

    @Symbol(SymbolConstants.PRODUCTION_MODE)
    final boolean productionMode,

    final AssetSource assetSource,

    final TypeCoercer typeCoercer,
    final SymbolSource symbolSource)
    {
        this.threadLocale = threadLocale;
        this.assetSource = assetSource;
        this.compactJSON = compactJSON;
        this.typeCoercer = typeCoercer;
        this.symbolSource = symbolSource;

        this.productionMode = productionMode;
    }

    public String getInitialization()
    {
        Locale locale = threadLocale.getLocale();

        JSONObject spec = new JSONObject();

        DateFormatSymbols symbols = new DateFormatSymbols(locale);

        spec.put("months", new JSONArray((Object[]) symbols.getMonths()));

        StringBuilder days = new StringBuilder();

        String[] weekdays = symbols.getWeekdays();

        Calendar c = Calendar.getInstance(locale);

        int firstDay = c.getFirstDayOfWeek();

        // DatePicker needs them in order from monday to sunday.

        for (int i = Calendar.MONDAY; i <= Calendar.SATURDAY; i++)
        {
            days.append(weekdays[i].substring(0, 1));
        }

        days.append(weekdays[Calendar.SUNDAY].substring(0, 1));

        spec.put("days", days.toString().toLowerCase(locale));

        // jQuery DatePicker widget expects 0 to be sunday. Calendar defines SUNDAY as 1, MONDAY as 2, etc.
        spec.put("firstDay", firstDay-1);

        // set language
        spec.put("language", locale.getLanguage());

        // TODO: Skip localization if locale is English?

        return String.format("Tapestry.DateField.initLocalization(%s);", spec.toString(compactJSON));
    }

    public List getJavaScriptLibraries()
    {
        String jQueryUIPath = symbolSource.valueForSymbol(JQuerySymbolConstants.JQUERY_UI_PATH);
        if ( ! jQueryUIPath.endsWith("/")) {

            jQueryUIPath += "/";
        }

        final List javaScriptStack = new ArrayList();

        javaScriptStack.add(assetSource.getClasspathAsset(String.format("%s%s/jquery.ui.datepicker%s.js", jQueryUIPath, 
        		(!productionMode ? "/minified" : ""),
        		(!productionMode ? ".min" : ""))));

        final Asset datePickerI18nAsset = getLocaleAsset(threadLocale.getLocale(), jQueryUIPath);

    	if (datePickerI18nAsset != null)
     	{
     	    javaScriptStack.add(datePickerI18nAsset);
     	}
        
     	javaScriptStack.add(assetSource.getExpandedAsset("${assets.path}/components/datefield/datefield.js"));

    	return javaScriptStack;
    }

    private Asset getLocaleAsset(Locale locale, String jQueryUIPath) {

        final String prefix = String.format("%s/i18n/jquery.ui.datepicker-%s", jQueryUIPath, locale.getLanguage());
        final Resource withCountryExtension = typeCoercer.coerce(String.format("%s-%s.js", prefix, locale.getCountry()), Resource.class);

        if (withCountryExtension.exists()) {

            return assetSource.getClasspathAsset(withCountryExtension.getPath());
        }

        final Resource withLanguageExtension = typeCoercer.coerce(String.format("%s.js", prefix), Resource.class);

        if (withLanguageExtension.exists()) {

            return assetSource.getClasspathAsset(withLanguageExtension.getPath());
        }

        return null;
    }

    public List getStylesheets()
    {
        return Collections.emptyList();
    }

    public List getStacks()
    {
        return Collections.emptyList();
    }

}