// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
 *******************************************************************************
 * Copyright (C) 2008-2015, International Business Machines Corporation and    *
 * others. All Rights Reserved.                                                *
 *******************************************************************************
 */
package com.ibm.icu.dev.test.localespi;

import java.text.CollationKey;
import java.text.Collator;
import java.util.Locale;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

import com.ibm.icu.dev.test.TestFmwk;
import com.ibm.icu.impl.jdkadapter.CollatorICU;
import com.ibm.icu.util.ULocale;

@RunWith(JUnit4.class)
public class CollatorTest extends TestFmwk {
    /*
     * Check if getInstance returns the ICU implementation.
     */
    @Test
    public void TestGetInstance() {
        for (Locale loc : Collator.getAvailableLocales()) {
            if (TestUtil.isExcluded(loc)) {
                logln("Skipped " + loc);
                continue;
            }

            Collator coll = Collator.getInstance(loc);

            boolean isIcuImpl = (coll instanceof com.ibm.icu.impl.jdkadapter.CollatorICU);

            if (TestUtil.isICUExtendedLocale(loc)) {
                if (!isIcuImpl) {
                    errln("FAIL: getInstance returned JDK Collator for locale " + loc);
                }
            } else {
                if (isIcuImpl) {
                    logln("INFO: getInstance returned ICU Collator for locale " + loc);
                }
                Locale iculoc = TestUtil.toICUExtendedLocale(loc);
                Collator collIcu = Collator.getInstance(iculoc);
                if (isIcuImpl) {
                    if (!coll.equals(collIcu)) {
                        errln("FAIL: getInstance returned ICU Collator for locale " + loc
                                + ", but different from the one for locale " + iculoc);
                    }
                } else {
                    if (!(collIcu instanceof com.ibm.icu.impl.jdkadapter.CollatorICU)) {
                        errln("FAIL: getInstance returned JDK Collator for locale " + iculoc);
                    }
                }
            }
        }
    }

    /*
     * Testing the behavior of text collation between ICU instance and its
     * equivalent created via the Locale SPI framework.
     */
    @Test
    public void TestICUEquivalent() {
        Locale[] TEST_LOCALES = {
                new Locale("en", "US"),
                new Locale("de", "DE"),
                new Locale("ja", "JP"),
        };

        String[] TEST_DATA = {
                "Cafe",
                "cafe",
                "CAFE",
                "caf\u00e9",
                "cafe\u0301",
                "\u304b\u3075\u3047",
                "\u304c\u3075\u3047",
                "\u304b\u3075\u3048",
                "\u30ab\u30d5\u30a7",
                "\uff76\uff8c\uff6a",
        };

        for (Locale loc : TEST_LOCALES) {
            Locale iculoc = TestUtil.toICUExtendedLocale(loc);
            Collator jdkColl = Collator.getInstance(iculoc);
            com.ibm.icu.text.Collator icuColl = com.ibm.icu.text.Collator.getInstance(loc);

            // Default strength = TERITIARY
            checkCollation(jdkColl, icuColl, TEST_DATA, "TERITIARY", loc);

            // PRIMARY
            jdkColl.setStrength(Collator.PRIMARY);
            icuColl.setStrength(com.ibm.icu.text.Collator.PRIMARY);
            checkCollation(jdkColl, icuColl, TEST_DATA, "PRIMARY", loc);

            // SECONDARY
            jdkColl.setStrength(Collator.SECONDARY);
            icuColl.setStrength(com.ibm.icu.text.Collator.SECONDARY);
            checkCollation(jdkColl, icuColl, TEST_DATA, "SECONDARY", loc);
        }
    }

    private void checkCollation(Collator jdkColl, com.ibm.icu.text.Collator icuColl,
            String[] data, String strength, Locale loc) {
        for (String text1 : data) {
            for (String text2 : data) {
                int jdkRes = jdkColl.compare(text1, text2);
                int icuRes = icuColl.compare(text1, text2);

                if (jdkRes != icuRes) {
                    errln("FAIL: Different results for [text1=" + text1 + ",text2=" + text2 + ") for locale "
                            + loc + " with strength " + strength + " - Result (jdk=" + jdkRes + ",icu=" + icuRes + ")");
                }

                // Evaluate collationKey
                CollationKey jdkKey1 = jdkColl.getCollationKey(text1);
                CollationKey jdkKey2 = jdkColl.getCollationKey(text2);

                com.ibm.icu.text.CollationKey icuKey1 = icuColl.getCollationKey(text1);
                com.ibm.icu.text.CollationKey icuKey2 = icuColl.getCollationKey(text2);

                int jdkKeyRes = jdkKey1.compareTo(jdkKey2);
                int icuKeyRes = icuKey1.compareTo(icuKey2);

                if (jdkKeyRes != icuKeyRes) {
                    errln("FAIL: Different collationKey comparison results for [text1=" + text1 + ",text2=" + text2
                            + ") for locale " + loc + " with strength " + strength
                            + " - Result (jdk=" + jdkRes + ",icu=" + icuRes + ")");
                }
            }
        }
    }

    @Test
    public void TestCollationKeyword() {
        // ICU provider variant is appended
        ULocale uloc = new ULocale("de_DE_" + TestUtil.ICU_VARIANT + "@collation=phonebook");
        Locale loc = uloc.toLocale();
        Collator jdkColl = Collator.getInstance(loc);
        boolean isPhonebook = false;
        if (jdkColl instanceof CollatorICU) {
            ULocale ulocJdkColl = ((CollatorICU)jdkColl).unwrap().getLocale(ULocale.VALID_LOCALE);
            if (ulocJdkColl.getKeywordValue("collation").equals("phonebook")) {
                isPhonebook = true;
            }
        }
        if (!isPhonebook) {
            errln("FAIL: The collation type is not phonebook");
        }
    }
}