/*
 *******************************************************************************
 * Copyright (C) 2004-2014, International Business Machines Corporation and    *
 * others. All Rights Reserved.                                                *
 *******************************************************************************
 */
package com.ibm.icu.impl;

import java.util.ArrayList;
import java.util.MissingResourceException;

import com.ibm.icu.util.ULocale;
import com.ibm.icu.util.UResourceBundle;
import com.ibm.icu.util.UResourceBundleIterator;

/**
 * This class abstracts access to calendar (Calendar and DateFormat) data.
 * @internal ICU 3.0
 */
public class CalendarData {
    /**
     * Construct a CalendarData from the given locale.
     * @param loc locale to use. The 'calendar' keyword will be ignored.
     * @param type calendar type. NULL indicates the gregorian calendar. 
     * No default lookup is done.
     */
    public CalendarData(ULocale loc, String type) {
        this((ICUResourceBundle)UResourceBundle.getBundleInstance(ICUResourceBundle.ICU_BASE_NAME, loc), type);
    }
    
    public CalendarData(ICUResourceBundle b, String type) {
        fBundle = b;
        if((type == null) || (type.equals("")) || (type.equals("gregorian"))) {
            fMainType = "gregorian";
            fFallbackType = null;
        } else {
            fMainType = type;
            fFallbackType = "gregorian";
        }
    }
    
    /**
     * Load data for calendar. Note, this object owns the resources, do NOT call ures_close()!
     *
     * @param key Resource key to data
     * @internal
     */
    public ICUResourceBundle get(String key) {
        try {
            return fBundle.getWithFallback("calendar/" + fMainType + "/" + key);
        } catch(MissingResourceException m) {
            if(fFallbackType != null) {
                return fBundle.getWithFallback("calendar/" + fFallbackType + "/" + key);
            }
            throw m;
            
        }       
    }

    /**
     * Load data for calendar. Note, this object owns the resources, do NOT call ures_close()!
     * There is an implicit key of 'format'
     * data is located in:   "calendar/key/format/subKey"
     * for example,  calendar/dayNames/format/abbreviated
     *
     * @param key Resource key to data
     * @param subKey Resource key to data
     * @internal
     */
    public ICUResourceBundle get(String key, String subKey) {
        try {
            return fBundle.getWithFallback("calendar/" + fMainType + "/" + key + "/format/" + subKey);
        } catch(MissingResourceException m) {
            if(fFallbackType != null) {
                return fBundle.getWithFallback("calendar/" + fFallbackType + "/" + key + "/format/" + subKey);
            }
            throw m;
            
        }       
    }

    /**
     * Load data for calendar. Note, this object owns the resources, do NOT call ures_close()!
     * data is located in:   "calendar/key/contextKey/subKey"
     * for example,  calendar/dayNames/stand-alone/narrow
     *
     * @param key Resource key to data
     * @param contextKey Resource key to data
     * @param subKey Resource key to data
     * @internal
     */
    public ICUResourceBundle get(String key, String contextKey, String subKey) {
        try {
            return fBundle.getWithFallback("calendar/" + fMainType + "/" + key + "/" + contextKey + "/" + subKey);
        } catch(MissingResourceException m) {
            if(fFallbackType != null) {
                return fBundle.getWithFallback("calendar/" + fFallbackType + "/" + key + "/" + contextKey + "/" + subKey);
            }
            throw m;
            
        }       
    }
    
     /**
     * Load data for calendar. Note, this object owns the resources...
     * data is located in:   "calendar/key/set/contextKey/subKey"
     * for example,  calendar/cyclicNameSets/years/format/abbreviated
     *
     * @param key Resource key to data
     * @param set Resource key to data
     * @param contextKey Resource key to data
     * @param subKey Resource key to data
     * @internal
     */
    public ICUResourceBundle get(String key, String set, String contextKey, String subKey) {
        try {
            return fBundle.getWithFallback("calendar/" + fMainType + "/" + key + "/" + set + "/" + contextKey + "/" + subKey);
        } catch(MissingResourceException m) {
            if(fFallbackType != null) {
                return fBundle.getWithFallback("calendar/" + fFallbackType + "/" + key + "/" + set + "/" + contextKey + "/" + subKey);
            }
            throw m;
            
        }       
    }
    
   public String[] getStringArray(String key) {
        return get(key).getStringArray();
    }

    public String[] getStringArray(String key, String subKey) {
        return get(key, subKey).getStringArray();
    }

    public String[] getStringArray(String key, String contextKey, String subKey) {
        return get(key, contextKey, subKey).getStringArray();
    }
    public String[] getEras(String subkey){
        ICUResourceBundle bundle = get("eras/"+subkey);
        return bundle.getStringArray();
    }
    public String[] getDateTimePatterns(){
        ICUResourceBundle bundle = get("DateTimePatterns");
        ArrayList<String> list = new ArrayList<String>();
        UResourceBundleIterator iter = bundle.getIterator();
        while (iter.hasNext()) {
            UResourceBundle patResource = iter.next();
            int resourceType = patResource.getType();
            switch (resourceType) {
                case UResourceBundle.STRING:
                    list.add(patResource.getString());
                    break;
                case UResourceBundle.ARRAY:
                    String[] items = patResource.getStringArray();
                    list.add(items[0]);
                    break;
            }
        }

        return list.toArray(new String[list.size()]);
    }
    
    /**
     * Returns the default date-time pattern such as <code>{1}, {0}</code>.
     * {1} is always the date and {0} is always the time.
     */
    public String getDateTimePattern() {
        // this is a hack to get offset 8 from the dateTimePatterns array.
        return _getDateTimePattern(-1);
    }
    
    /**
     * Returns the date-time pattern by style where style is one of the style fields defined
     * in DateFormat. If date-time patterns by style are not available, it returns what
     * {@link #getDateTimePattern()} would return.
     * @param style the style e.g DateFormat.LONG.
     * @return the pattern, e.g {1}, {0}.
     */
    public String getDateTimePattern(int style) {
        // mask away high order bits such as the DateFormat.RELATIVE bit.
        // We do it this way to avoid making this class depend on DateFormat. It makes this
        // code more brittle, but it is no more brittle than how we access patterns by style.
        return _getDateTimePattern(style & 7);
    }
    
    private String _getDateTimePattern(int offset) {
        String[] patterns = null;
        try {
            patterns = getDateTimePatterns();
        } catch (MissingResourceException ignored) {
            // ignore. patterns remains null.
        }
        if (patterns == null || patterns.length < 9) {
            // Return hard-coded default. patterns array not available or it has too few
            // elements.
            return "{1} {0}";
        }
        if (patterns.length < 13) {
            // Offset 8 contains default pattern if we don't have per style patterns.
            return patterns[8];
        }
        // DateTimePatterns start at index 9 in the array.
        return patterns[9 + offset];
    }
        
    public String[] getOverrides(){
        ICUResourceBundle bundle = get("DateTimePatterns");
        ArrayList<String> list = new ArrayList<String>();
        UResourceBundleIterator iter = bundle.getIterator();
        while (iter.hasNext()) {
            UResourceBundle patResource = iter.next();
            int resourceType = patResource.getType();
            switch (resourceType) {
                case UResourceBundle.STRING:
                    list.add(null);
                    break;
                case UResourceBundle.ARRAY:
                    String[] items = patResource.getStringArray();
                    list.add(items[1]);
                    break;
            }
        }
        return list.toArray(new String[list.size()]);
    }

    public ULocale getULocale() {
        return fBundle.getULocale();
    }

    private ICUResourceBundle fBundle;
    private String fMainType;
    private String fFallbackType;
}