/*
**********************************************************************
* Copyright (c) 2009, International Business Machines
* Corporation and others.  All Rights Reserved.
**********************************************************************
* Author: Alan Liu
* Created: January 14 2004
* Since: ICU 2.8
**********************************************************************
*/
package com.ibm.icu.dev.test.util;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Locale;

import com.ibm.icu.dev.test.TestFmwk;
import com.ibm.icu.text.Collator;
import com.ibm.icu.util.ULocale;

public class ULocaleCollationTest extends TestFmwk {

    public static void main(String[] args) throws Exception {
        new ULocaleCollationTest().run(args);
    }

    public void TestCollator() {
        checkService("ja_JP_YOKOHAMA", new ServiceFacade() {
                public Object create(ULocale req) {
                    return Collator.getInstance(req);
                }
            }, null, new Registrar() {
                    public Object register(ULocale loc, Object prototype) {
                        return Collator.registerInstance((Collator) prototype, loc);
                    }
                    public boolean unregister(Object key) {
                        return Collator.unregister(key);
                    }
                });
    }


    /**
     * Interface used by checkService defining a protocol to create an
     * object, given a requested locale.
     */
    interface ServiceFacade {
        Object create(ULocale requestedLocale);
    }

    /**
     * Interface used by checkService defining a protocol to get a
     * contained subobject, given its parent object.
     */
    interface Subobject {
        Object get(Object parent);
    }

    /**
     * Interface used by checkService defining a protocol to register
     * and unregister a service object prototype.
     */
    interface Registrar {
        Object register(ULocale loc, Object prototype);
        boolean unregister(Object key);
    }


    /**
     * Compare two locale IDs.  If they are equal, return 0.  If `string'
     * starts with `prefix' plus an additional element, that is, string ==
     * prefix + '_' + x, then return 1.  Otherwise return a value < 0.
     */
    static int loccmp(String string, String prefix) {
        int slen = string.length(),
            plen = prefix.length();
        /* 'root' is "less than" everything */
        if (prefix.equals("root")) {
            return string.equals("root") ? 0 : 1;
        }
        // ON JAVA (only -- not on C -- someone correct me if I'm wrong)
        // consider "" to be an alternate name for "root".
        if (plen == 0) {
            return slen == 0 ? 0 : 1;
        }
        if (!string.startsWith(prefix)) return -1; /* mismatch */
        if (slen == plen) return 0;
        if (string.charAt(plen) == '_') return 1;
        return -2; /* false match, e.g. "en_USX" cmp "en_US" */
    }

    /**
     * Check the relationship between requested locales, and report problems.
     * The caller specifies the expected relationships between requested
     * and valid (expReqValid) and between valid and actual (expValidActual).
     * Possible values are:
     * "gt" strictly greater than, e.g., en_US > en
     * "ge" greater or equal,      e.g., en >= en
     * "eq" equal,                 e.g., en == en
     */
    void checklocs(String label,
                   String req,
                   Locale validLoc,
                   Locale actualLoc,
                   String expReqValid,
                   String expValidActual) {
        String valid = validLoc.toString();
        String actual = actualLoc.toString();
        int reqValid = loccmp(req, valid);
        int validActual = loccmp(valid, actual);
    boolean reqOK = (expReqValid.equals("gt") && reqValid > 0) ||
        (expReqValid.equals("ge") && reqValid >= 0) ||
        (expReqValid.equals("eq") && reqValid == 0);
    boolean valOK = (expValidActual.equals("gt") && validActual > 0) ||
        (expValidActual.equals("ge") && validActual >= 0) ||
        (expValidActual.equals("eq") && validActual == 0);
        if (reqOK && valOK) {
            logln("Ok: " + label + "; req=" + req + ", valid=" + valid +
                  ", actual=" + actual);
        } else {
            errln("FAIL: " + label + "; req=" + req + ", valid=" + valid +
                  ", actual=" + actual +
          (reqOK ? "" : "\n  req !" + expReqValid + " valid") +
          (valOK ? "" : "\n  val !" + expValidActual + " actual"));
        }
    }

    /**
     * Use reflection to call getLocale() on the given object to
     * determine both the valid and the actual locale.  Verify these
     * for correctness.
     */
    void checkObject(String requestedLocale, Object obj,
                     String expReqValid, String expValidActual) {
        Class[] getLocaleParams = new Class[] { ULocale.Type.class };
        try {
            Class cls = obj.getClass();
            Method getLocale = cls.getMethod("getLocale", getLocaleParams);
            ULocale valid = (ULocale) getLocale.invoke(obj, new Object[] {
                ULocale.VALID_LOCALE });
            ULocale actual = (ULocale) getLocale.invoke(obj, new Object[] {
                ULocale.ACTUAL_LOCALE });
            checklocs(cls.getName(), requestedLocale,
                      valid.toLocale(), actual.toLocale(),
                      expReqValid, expValidActual);
        }

        // Make the following exceptions _specific_ -- do not
        // catch(Exception), since that will catch the exception
        // that errln throws.
        catch(NoSuchMethodException e1) {
        // no longer an error, Currency has no getLocale
            // errln("FAIL: reflection failed: " + e1);
        } catch(SecurityException e2) {
            errln("FAIL: reflection failed: " + e2);
        } catch(IllegalAccessException e3) {
            errln("FAIL: reflection failed: " + e3);
        } catch(IllegalArgumentException e4) {
            errln("FAIL: reflection failed: " + e4);
        } catch(InvocationTargetException e5) {
        // no longer an error, Currency has no getLocale
            // errln("FAIL: reflection failed: " + e5);
        }
    }

    /**
     * Verify the correct getLocale() behavior for the given service.
     * @param requestedLocale the locale to request.  This MUST BE
     * FAKE.  In other words, it should be something like
     * en_US_FAKEVARIANT so this method can verify correct fallback
     * behavior.
     * @param svc a factory object that can create the object to be
     * tested.  This isn't necessary here (one could just pass in the
     * object) but is required for the overload of this method that
     * takes a Registrar.
     */
    void checkService(String requestedLocale, ServiceFacade svc) {
        checkService(requestedLocale, svc, null, null);
    }

    /**
     * Verify the correct getLocale() behavior for the given service.
     * @param requestedLocale the locale to request.  This MUST BE
     * FAKE.  In other words, it should be something like
     * en_US_FAKEVARIANT so this method can verify correct fallback
     * behavior.
     * @param svc a factory object that can create the object to be
     * tested.
     * @param sub an object that can be used to retrieve a subobject
     * which should also be tested.  May be null.
     * @param reg an object that supplies the registration and
     * unregistration functionality to be tested.  May be null.
     */
    void checkService(String requestedLocale, ServiceFacade svc,
                      Subobject sub, Registrar reg) {
        ULocale req = new ULocale(requestedLocale);
        Object obj = svc.create(req);
        checkObject(requestedLocale, obj, "gt", "ge");
        if (sub != null) {
            Object subobj = sub.get(obj);
            checkObject(requestedLocale, subobj, "gt", "ge");
        }
        if (reg != null) {
            logln("Info: Registering service");
            Object key = reg.register(req, obj);
            Object objReg = svc.create(req);
            checkObject(requestedLocale, objReg, "eq", "eq");
            if (sub != null) {
                Object subobj = sub.get(obj);
                // Assume subobjects don't come from services, so
                // their metadata should be structured normally.
                checkObject(requestedLocale, subobj, "gt", "ge");
            }
            logln("Info: Unregistering service");
            if (!reg.unregister(key)) {
                errln("FAIL: unregister failed");
            }
            Object objUnreg = svc.create(req);
            checkObject(requestedLocale, objUnreg, "gt", "ge");
        }
    }
}