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

package org.opensearch.knn.index;

import com.google.common.collect.ImmutableMap;
import org.opensearch.knn.KNNTestCase;
import org.opensearch.core.xcontent.XContentBuilder;
import org.opensearch.common.xcontent.XContentFactory;

import java.io.IOException;
import java.util.Map;

import static org.opensearch.knn.common.KNNConstants.NAME;
import static org.opensearch.knn.common.KNNConstants.PARAMETERS;

public class MethodComponentTests extends KNNTestCase {
    /**
     * Test name getter
     */
    public void testGetName() {
        String name = "test";
        MethodComponent methodComponent = MethodComponent.Builder.builder(name).build();
        assertEquals(name, methodComponent.getName());
    }

    /**
     * Test parameter getter
     */
    public void testGetParameters() {
        String name = "test";
        String paramKey = "key";
        MethodComponent methodComponent = MethodComponent.Builder.builder(name)
            .addParameter(paramKey, new Parameter.IntegerParameter(paramKey, 1, v -> v > 0))
            .build();
        assertEquals(1, methodComponent.getParameters().size());
        assertTrue(methodComponent.getParameters().containsKey(paramKey));
    }

    /**
     * Test validation
     */
    public void testValidate() throws IOException {
        // Invalid parameter key
        String methodName = "test-method";
        XContentBuilder xContentBuilder = XContentFactory.jsonBuilder()
            .startObject()
            .field(NAME, methodName)
            .startObject(PARAMETERS)
            .field("invalid", "invalid")
            .endObject()
            .endObject();
        Map<String, Object> in = xContentBuilderToMap(xContentBuilder);
        MethodComponentContext componentContext1 = MethodComponentContext.parse(in);

        MethodComponent methodComponent1 = MethodComponent.Builder.builder(methodName).build();
        assertNotNull(methodComponent1.validate(componentContext1));

        // Invalid parameter type
        xContentBuilder = XContentFactory.jsonBuilder()
            .startObject()
            .field(NAME, methodName)
            .startObject(PARAMETERS)
            .field("valid", "invalid")
            .endObject()
            .endObject();
        in = xContentBuilderToMap(xContentBuilder);
        MethodComponentContext componentContext2 = MethodComponentContext.parse(in);

        MethodComponent methodComponent2 = MethodComponent.Builder.builder(methodName)
            .addParameter("valid", new Parameter.IntegerParameter("valid", 1, v -> v > 0))
            .build();
        assertNotNull(methodComponent2.validate(componentContext2));

        // valid configuration
        xContentBuilder = XContentFactory.jsonBuilder()
            .startObject()
            .field(NAME, methodName)
            .startObject(PARAMETERS)
            .field("valid1", 16)
            .field("valid2", 128)
            .endObject()
            .endObject();
        in = xContentBuilderToMap(xContentBuilder);
        MethodComponentContext componentContext3 = MethodComponentContext.parse(in);

        MethodComponent methodComponent3 = MethodComponent.Builder.builder(methodName)
            .addParameter("valid1", new Parameter.IntegerParameter("valid1", 1, v -> v > 0))
            .addParameter("valid2", new Parameter.IntegerParameter("valid2", 1, v -> v > 0))
            .build();
        assertNull(methodComponent3.validate(componentContext3));

        // valid configuration - empty parameters
        xContentBuilder = XContentFactory.jsonBuilder().startObject().field(NAME, methodName).endObject();
        in = xContentBuilderToMap(xContentBuilder);
        MethodComponentContext componentContext4 = MethodComponentContext.parse(in);

        MethodComponent methodComponent4 = MethodComponent.Builder.builder(methodName)
            .addParameter("valid1", new Parameter.IntegerParameter("valid1", 1, v -> v > 0))
            .addParameter("valid2", new Parameter.IntegerParameter("valid2", 1, v -> v > 0))
            .build();
        assertNull(methodComponent4.validate(componentContext4));
    }

    @SuppressWarnings("unchecked")
    public void testGetAsMap_withoutGenerator() throws IOException {
        String methodName = "test-method";
        String parameterName1 = "valid1";
        String parameterName2 = "valid2";
        int default1 = 4;
        int default2 = 5;

        MethodComponent methodComponent = MethodComponent.Builder.builder(methodName)
            .addParameter(parameterName1, new Parameter.IntegerParameter(parameterName1, default1, v -> v > 0))
            .addParameter(parameterName2, new Parameter.IntegerParameter(parameterName2, default2, v -> v > 0))
            .build();

        XContentBuilder xContentBuilder = XContentFactory.jsonBuilder()
            .startObject()
            .field(NAME, methodName)
            .startObject(PARAMETERS)
            .field(parameterName1, 16)
            .field(parameterName2, 128)
            .endObject()
            .endObject();
        Map<String, Object> in = xContentBuilderToMap(xContentBuilder);
        MethodComponentContext methodComponentContext = MethodComponentContext.parse(in);

        assertEquals(in, methodComponent.getAsMap(methodComponentContext));

        xContentBuilder = XContentFactory.jsonBuilder().startObject().field(NAME, methodName).endObject();
        in = xContentBuilderToMap(xContentBuilder);
        methodComponentContext = MethodComponentContext.parse(in);

        Map<String, Object> methodAsMap = methodComponent.getAsMap(methodComponentContext);
        assertEquals(default1, ((Map<String, Object>) methodAsMap.get(PARAMETERS)).get(parameterName1));
        assertEquals(default2, ((Map<String, Object>) methodAsMap.get(PARAMETERS)).get(parameterName2));
    }

    public void testGetAsMap_withGenerator() throws IOException {
        String methodName = "test-method";
        Map<String, Object> generatedMap = ImmutableMap.of("test-key", "test-value");
        MethodComponent methodComponent = MethodComponent.Builder.builder(methodName)
            .addParameter("valid1", new Parameter.IntegerParameter("valid1", 1, v -> v > 0))
            .addParameter("valid2", new Parameter.IntegerParameter("valid2", 1, v -> v > 0))
            .setMapGenerator((methodComponent1, methodComponentContext) -> generatedMap)
            .build();

        XContentBuilder xContentBuilder = XContentFactory.jsonBuilder().startObject().field(NAME, methodName).endObject();
        Map<String, Object> in = xContentBuilderToMap(xContentBuilder);
        MethodComponentContext methodComponentContext = MethodComponentContext.parse(in);

        assertEquals(generatedMap, methodComponent.getAsMap(methodComponentContext));
    }

    public void testBuilder() {
        String name = "test";
        MethodComponent.Builder builder = MethodComponent.Builder.builder(name);
        MethodComponent methodComponent = builder.build();

        assertEquals(0, methodComponent.getParameters().size());
        assertEquals(name, methodComponent.getName());

        builder.addParameter("test", new Parameter.IntegerParameter("test", 1, v -> v > 0));
        methodComponent = builder.build();

        assertEquals(1, methodComponent.getParameters().size());

        Map<String, Object> generatedMap = ImmutableMap.of("test-key", "test-value");
        builder.setMapGenerator((methodComponent1, methodComponentContext) -> generatedMap);
        methodComponent = builder.build();

        assertEquals(generatedMap, methodComponent.getAsMap(null));
    }
}