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package humanize.spi.context;

import static humanize.util.Constants.EMPTY;
import static humanize.util.Constants.SPACE;
import humanize.spi.MessageFormat;
import humanize.spi.cache.CacheProvider;
import humanize.text.MaskFormat;
import humanize.time.PrettyTimeFormat;
import humanize.util.UTF8Control;

import java.text.DateFormat;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Collection;
import java.util.Date;
import java.util.Locale;
import java.util.ResourceBundle;
import java.util.ServiceLoader;
import java.util.concurrent.Callable;

/**
 * Default implementation of {@link Context}.
 * 
 * @author mfornos
 * 
 */
public class DefaultContext implements Context, StandardContext
{

    private static final String BUNDLE_LOCATION = "i18n.Humanize";

    private static final String ORDINAL_SUFFIXES = "ordinal.suffixes";

    private static final String TIME_SUFFIXES = "time.suffixes";

    private static final String CURRENCY = "currency";

    private static final String DECIMAL = "decimal";

    private static final String NUMBER = "number";

    private static final String DIGITS = "digits";

    private static final String PERCENT = "percent";

    private static final String DATE_FORMAT = "date";

    private static final String DATE_TIME_FORMAT = "date.time";

    private static final String SIMPLE_DATE = "simple.date";

    private static final String PRETTY_TIME = "pretty.time";

    private static final String MASK = "mask";

    private final static CacheProvider sharedCache = loadCacheProvider();

    private static CacheProvider loadCacheProvider()
    {
        ServiceLoader ldr = ServiceLoader.load(CacheProvider.class);

        for (CacheProvider provider : ldr)
        {
            return provider;
        }

        throw new RuntimeException("No CacheProvider was found");
    }

    private final CacheProvider localCache = loadCacheProvider();

    private Locale locale;

    public DefaultContext()
    {
        this(Locale.getDefault());
    }

    public DefaultContext(Locale locale)
    {
        setLocale(locale);
    }

    @Override
    public String digitStrings(int index)
    {
        return getStringByIndex(DIGITS, index);
    }

    @Override
    public String formatDate(int style, Date value)
    {
        return getDateFormat(style).format(value);
    }

    @Override
    public String formatDateTime(Date date)
    {
        return getDateTimeFormat().format(date);
    }

    @Override
    public String formatDateTime(int dateStyle, int timeStyle, Date date)
    {
        return getDateTimeFormat(dateStyle, timeStyle).format(date);
    }

    @Override
    public String formatDecimal(Number value)
    {
        return getNumberFormat().format(value);
    }

    @Override
    public String formatMessage(String key, Object... args)
    {
        MessageFormat fmt = getMessageFormat();
        fmt.applyPattern(getBundle().getString(key));
        return fmt.render(args);
    }

    @Override
    public String formatRelativeDate(Date reference, Date duration)
    {
        return getPrettyTimeFormat().format(reference, duration);
    }

    @Override
    public String formatRelativeDate(Date reference, Date duration, long precision)
    {
        return getPrettyTimeFormat().format(reference, duration, precision);
    }

    @Override
    public ResourceBundle getBundle()
    {
        return sharedCache.getBundle(locale, new Callable()
        {
            @Override
            public ResourceBundle call() throws Exception
            {
                return ResourceBundle.getBundle(BUNDLE_LOCATION, locale, new UTF8Control());
            }
        });
    }

    @Override
    public DecimalFormat getCurrencyFormat()
    {
        return sharedCache.getFormat(CURRENCY, locale, new Callable()
        {
            @Override
            public DecimalFormat call() throws Exception
            {
                return (DecimalFormat) NumberFormat.getCurrencyInstance(locale);
            }
        });
    }

    @Override
    public DateFormat getDateFormat(final int style)
    {
        String name = DATE_FORMAT + style;

        return localCache.getFormat(name, locale, new Callable()
        {
            @Override
            public DateFormat call() throws Exception
            {
                return DateFormat.getDateInstance(style, locale);
            }
        });
    }

    @Override
    public DateFormat getDateFormat(final String pattern)
    {
        return localCache.getFormat(SIMPLE_DATE + pattern.hashCode(), locale, new Callable()
        {
            @Override
            public DateFormat call() throws Exception
            {
                return new SimpleDateFormat(pattern, locale);
            }
        });
    }

    @Override
    public DateFormat getDateTimeFormat()
    {
        return getDateTimeFormat(DateFormat.SHORT, DateFormat.SHORT);
    }

    @Override
    public DateFormat getDateTimeFormat(final int dateStyle, final int timeStyle)
    {
        String name = DATE_TIME_FORMAT + dateStyle + timeStyle;

        return localCache.getFormat(name, locale, new Callable()
        {
            @Override
            public DateFormat call() throws Exception
            {
                return DateFormat.getDateTimeInstance(dateStyle, timeStyle, locale);
            }
        });
    }

    @Override
    public DecimalFormat getDecimalFormat()
    {
        return localCache.getFormat(DECIMAL, locale, new Callable()
        {
            @Override
            public DecimalFormat call() throws Exception
            {
                return (DecimalFormat) DecimalFormat.getInstance(locale);
            }
        });
    }

    @Override
    public Locale getLocale()
    {
        return locale;
    }

    @Override
    public MaskFormat getMaskFormat()
    {
        return localCache.getFormat(MASK, Locale.ROOT, new Callable()
        {
            @Override
            public MaskFormat call() throws Exception
            {
                return new MaskFormat("");
            }
        });
    }

    @Override
    public String getMessage(String key)
    {
        return getBundle().getString(key);
    }

    @Override
    public MessageFormat getMessageFormat()
    {
        return new MessageFormat(EMPTY, locale);
    }

    @Override
    public NumberFormat getNumberFormat()
    {
        return sharedCache.getFormat(NUMBER, locale, new Callable()
        {
            @Override
            public NumberFormat call() throws Exception
            {
                return NumberFormat.getInstance(locale);
            }
        });
    }

    @Override
    public DecimalFormat getPercentFormat()
    {
        return sharedCache.getFormat(PERCENT, locale, new Callable()
        {
            @Override
            public DecimalFormat call() throws Exception
            {
                return (DecimalFormat) NumberFormat.getPercentInstance(locale);
            }
        });
    }

    @Override
    public PrettyTimeFormat getPrettyTimeFormat()
    {
        return sharedCache.getFormat(PRETTY_TIME, locale, new Callable()
        {
            @Override
            public PrettyTimeFormat call() throws Exception
            {
                return new PrettyTimeFormat(locale);
            }
        });
    }

    @Override
    public String ordinalSuffix(int index)
    {
        return getStringByIndex(ORDINAL_SUFFIXES, index);
    }

    @Override
    public void setLocale(Locale locale)
    {
        this.locale = locale;
    }

    @Override
    public String timeSuffix(int index)
    {
        return getStringByIndex(TIME_SUFFIXES, index);
    }

    protected String getStringByIndex(final String cacheName, final int index)
    {
        return getStrings(cacheName)[index];
    }

    protected Collection getStringList(final String cacheName)
    {
        return Arrays.asList(getStrings(cacheName));
    }

    protected String[] getStrings(final String cacheName)
    {
        return sharedCache.getStrings(cacheName, locale, new Callable()
        {
            @Override
            public String[] call() throws Exception
            {
                return getBundle().getString(cacheName).split(SPACE);
            }
        });
    }

}