/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you 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.
 */

/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.painless;

import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.opensearch.common.settings.Settings;
import org.opensearch.painless.spi.Allowlist;
import org.opensearch.painless.spi.AllowlistLoader;
import org.opensearch.script.ScriptContext;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;

public class AugmentationTests extends ScriptTestCase {
    private static PainlessScriptEngine SCRIPT_ENGINE;

    @BeforeClass
    public static void beforeClass() {
        Map<ScriptContext<?>, List<Allowlist>> contexts = newDefaultContexts();
        List<Allowlist> digestAllowlist = new ArrayList<>(Allowlist.BASE_ALLOWLISTS);
        digestAllowlist.add(AllowlistLoader.loadFromResourceFiles(Allowlist.class, "org.opensearch.ingest.txt"));
        contexts.put(DigestTestScript.CONTEXT, digestAllowlist);
        SCRIPT_ENGINE = new PainlessScriptEngine(Settings.EMPTY, contexts);
    }

    @AfterClass
    public static void afterClass() {
        SCRIPT_ENGINE = null;
    }

    @Override
    protected PainlessScriptEngine getEngine() {
        return SCRIPT_ENGINE;
    }

    public abstract static class DigestTestScript {
        public static final String[] PARAMETERS = {};

        public abstract String execute();

        public interface Factory {
            DigestTestScript newInstance();
        }

        public static final ScriptContext<DigestTestScript.Factory> CONTEXT = new ScriptContext<>("test", DigestTestScript.Factory.class);
    }

    public void testStatic() {
        assertEquals(1, exec("ArrayList l = new ArrayList(); l.add(1); return l.getLength();"));
        assertEquals(1, exec("ArrayList l = new ArrayList(); l.add(1); return l.length;"));
    }

    public void testSubclass() {
        assertEquals(1, exec("List l = new ArrayList(); l.add(1); return l.getLength();"));
        assertEquals(1, exec("List l = new ArrayList(); l.add(1); return l.length;"));
    }

    public void testDef() {
        assertEquals(1, exec("def l = new ArrayList(); l.add(1); return l.getLength();"));
        assertEquals(1, exec("def l = new ArrayList(); l.add(1); return l.length;"));
    }

    public void testCapturingReference() {
        assertEquals(
            1,
            exec("int foo(Supplier t) { return t.get() }" + "ArrayList l = new ArrayList(); l.add(1);" + "return foo(l::getLength);")
        );
        assertEquals(
            1,
            exec("int foo(Supplier t) { return t.get() }" + "List l = new ArrayList(); l.add(1);" + "return foo(l::getLength);")
        );
        assertEquals(
            1,
            exec("int foo(Supplier t) { return t.get() }" + "def l = new ArrayList(); l.add(1);" + "return foo(l::getLength);")
        );
    }

    public void testIterable_Any() {
        assertEquals(true, exec("List l = new ArrayList(); l.add(1); l.any(x -> x == 1)"));
    }

    public void testIterable_AsCollection() {
        assertEquals(true, exec("List l = new ArrayList(); return l.asCollection() === l"));
    }

    public void testIterable_AsList() {
        assertEquals(true, exec("List l = new ArrayList(); return l.asList() === l"));
        assertEquals(5, exec("Set l = new HashSet(); l.add(5); return l.asList()[0]"));
    }

    public void testIterable_Each() {
        assertEquals(1, exec("List l = new ArrayList(); l.add(1); List l2 = new ArrayList(); l.each(l2::add); return l2.size()"));
    }

    public void testIterable_EachWithIndex() {
        assertEquals(0, exec("List l = new ArrayList(); l.add(2); Map m = new HashMap(); l.eachWithIndex(m::put); return m.get(2)"));
    }

    public void testIterable_Every() {
        assertEquals(false, exec("List l = new ArrayList(); l.add(1); l.add(2); l.every(x -> x == 1)"));
    }

    public void testIterable_FindResults() {
        assertEquals(1, exec("List l = new ArrayList(); l.add(1); l.add(2); l.findResults(x -> x == 1 ? x : null).size()"));
    }

    public void testIterable_GroupBy() {
        assertEquals(2, exec("List l = new ArrayList(); l.add(1); l.add(-1); l.groupBy(x -> x < 0 ? 'negative' : 'positive').size()"));
    }

    public void testIterable_Join() {
        assertEquals("test,ing", exec("List l = new ArrayList(); l.add('test'); l.add('ing'); l.join(',')"));
    }

    public void testIterable_Sum() {
        assertEquals(3.0D, exec("def l = [1,2]; return l.sum()"));
        assertEquals(5.0D, exec("List l = new ArrayList(); l.add(1); l.add(2); l.sum(x -> x + 1)"));
    }

    public void testCollection_Collect() {
        assertEquals(Arrays.asList(2, 3), exec("List l = new ArrayList(); l.add(1); l.add(2); l.collect(x -> x + 1)"));
        assertEquals(asSet(2, 3), exec("List l = new ArrayList(); l.add(1); l.add(2); l.collect(new HashSet(), x -> x + 1)"));
    }

    public void testCollection_Find() {
        assertEquals(2, exec("List l = new ArrayList(); l.add(1); l.add(2); return l.find(x -> x == 2)"));
    }

    public void testCollection_FindAll() {
        assertEquals(Arrays.asList(2), exec("List l = new ArrayList(); l.add(1); l.add(2); return l.findAll(x -> x == 2)"));
    }

    public void testCollection_FindResult() {
        assertEquals("found", exec("List l = new ArrayList(); l.add(1); l.add(2); return l.findResult(x -> x > 1 ? 'found' : null)"));
        assertEquals(
            "notfound",
            exec("List l = new ArrayList(); l.add(1); l.add(2); return l.findResult('notfound', x -> x > 10 ? 'found' : null)")
        );
    }

    public void testCollection_Split() {
        assertEquals(
            Arrays.asList(Arrays.asList(2), Arrays.asList(1)),
            exec("List l = new ArrayList(); l.add(1); l.add(2); return l.split(x -> x == 2)")
        );
    }

    public void testMap_Collect() {
        assertEquals(
            Arrays.asList("one1", "two2"),
            exec("Map m = new TreeMap(); m.one = 1; m.two = 2; m.collect((key,value) -> key + value)")
        );
        assertEquals(
            asSet("one1", "two2"),
            exec("Map m = new TreeMap(); m.one = 1; m.two = 2; m.collect(new HashSet(), (key,value) -> key + value)")
        );
    }

    public void testMap_Count() {
        assertEquals(1, exec("Map m = new TreeMap(); m.one = 1; m.two = 2; m.count((key,value) -> value == 2)"));
    }

    public void testMap_Each() {
        assertEquals(2, exec("Map m = new TreeMap(); m.one = 1; m.two = 2; Map m2 = new TreeMap(); m.each(m2::put); return m2.size()"));
    }

    public void testMap_Every() {
        assertEquals(false, exec("Map m = new TreeMap(); m.one = 1; m.two = 2; m.every((key,value) -> value == 2)"));
    }

    public void testMap_Find() {
        assertEquals("two", exec("Map m = new TreeMap(); m.one = 1; m.two = 2; return m.find((key,value) -> value == 2).key"));
    }

    public void testMap_FindAll() {
        assertEquals(
            Collections.singletonMap("two", 2),
            exec("Map m = new TreeMap(); m.one = 1; m.two = 2; return m.findAll((key,value) -> value == 2)")
        );
    }

    public void testMap_FindResult() {
        assertEquals(
            "found",
            exec("Map m = new TreeMap(); m.one = 1; m.two = 2; return m.findResult((key,value) -> value == 2 ? 'found' : null)")
        );
        assertEquals(
            "notfound",
            exec(
                "Map m = new TreeMap(); m.one = 1; m.two = 2; "
                    + "return m.findResult('notfound', (key,value) -> value == 10 ? 'found' : null)"
            )
        );
    }

    public void testMap_FindResults() {
        assertEquals(
            Arrays.asList("negative", "positive"),
            exec("Map m = new TreeMap(); m.a = -1; m.b = 1; " + "return m.findResults((key,value) -> value < 0 ? 'negative' : 'positive')")
        );
    }

    public void testMap_GroupBy() {
        Map<String, Map<String, Integer>> expected = new HashMap<>();
        expected.put("negative", Collections.singletonMap("a", -1));
        expected.put("positive", Collections.singletonMap("b", 1));
        assertEquals(
            expected,
            exec("Map m = new TreeMap(); m.a = -1; m.b = 1; " + "return m.groupBy((key,value) -> value < 0 ? 'negative' : 'positive')")
        );
    }

    public void testFeatureTest() {
        assertEquals(
            5,
            exec(
                "org.opensearch.painless.FeatureTestObject ft = new org.opensearch.painless.FeatureTestObject();"
                    + " ft.setX(3); ft.setY(2); return ft.getTotal()"
            )
        );
        assertEquals(
            5,
            exec("def ft = new org.opensearch.painless.FeatureTestObject();" + " ft.setX(3); ft.setY(2); return ft.getTotal()")
        );
        assertEquals(
            8,
            exec(
                "org.opensearch.painless.FeatureTestObject ft = new org.opensearch.painless.FeatureTestObject();"
                    + " ft.setX(3); ft.setY(2); return ft.addToTotal(3)"
            )
        );
        assertEquals(
            8,
            exec("def ft = new org.opensearch.painless.FeatureTestObject();" + " ft.setX(3); ft.setY(2); return ft.addToTotal(3)")
        );
    }

    private static class SplitCase {
        final String input;
        final String token;
        final int count;

        SplitCase(String input, String token, int count) {
            this.input = input;
            this.token = token;
            this.count = count;
        }

        SplitCase(String input, String token) {
            this(input, token, -1);
        }
    }

    public void testString_SplitOnToken() {
        SplitCase[] cases = new SplitCase[] {
            new SplitCase("", ""),
            new SplitCase("a,b,c", ","),
            new SplitCase("a,b,c", "|"),
            new SplitCase("a,,b,,c", ","),
            new SplitCase("a,,b,,c", ",", 1),
            new SplitCase("a,,b,,c", ",", 3),
            new SplitCase("a,,b,,c", ",", 300),
            new SplitCase("a,b,c", "a,b,c,d"),
            new SplitCase("aaaaaaa", "a"),
            new SplitCase("aaaaaaa", "a", 2),
            new SplitCase("1.1.1.1.111", "1"),
            new SplitCase("1.1.1.1.111", "."),
            new SplitCase("1\n1.1.\r\n1\r\n111", "\r\n"), };
        for (SplitCase split : cases) {
            assertArrayEquals(
                split.input.split(Pattern.quote(split.token), split.count),
                (String[]) exec("return \"" + split.input + "\".splitOnToken(\"" + split.token + "\", " + split.count + ");")
            );
        }
    }

    public String execDigest(String script) {
        return getEngine().compile("digest_test", script, DigestTestScript.CONTEXT, Collections.emptyMap()).newInstance().execute();
    }

    public void testSha1() {
        assertEquals("0beec7b5ea3f0fdbc95d0dd47f3c5bc275da8a33", execDigest("'foo'.sha1()"));
        assertEquals("62cdb7020ff920e5aa642c3d4066950dd1f01f4d", execDigest("'bar'.sha1()"));
        assertEquals("5f5513f8822fdbe5145af33b64d8d970dcf95c6e", execDigest("'foobarbaz'.sha1()"));
    }

    public void testSha256() {
        assertEquals("2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7ae", execDigest("'foo'.sha256()"));
        assertEquals("fcde2b2edba56bf408601fb721fe9b5c338d10ee429ea04fae5511b68fbf8fb9", execDigest("'bar'.sha256()"));
        assertEquals("97df3588b5a3f24babc3851b372f0ba71a9dcdded43b14b9d06961bfc1707d9d", execDigest("'foobarbaz'.sha256()"));
    }
}