/*
 * Licensed 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.
 */
package org.jdbi.v3.core.argument;

import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.util.Arrays;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.TimeUnit;
import java.util.function.Function;
import java.util.stream.Collectors;
import net.jodah.expiringmap.ExpirationPolicy;
import net.jodah.expiringmap.ExpiringMap;
import org.jdbi.v3.core.statement.StatementContext;

Binds public methods with no parameters on a specified object.
/**
 * Binds public methods with no parameters on a specified object.
 */
public class ObjectMethodArguments extends MethodReturnValueNamedArgumentFinder {
    private static final Map<Class<?>, Map<String, Method>> CLASS_METHODS = ExpiringMap.builder()
        .expiration(10, TimeUnit.MINUTES)
        .expirationPolicy(ExpirationPolicy.ACCESSED)
        .entryLoader((Class<?> type) ->
            Arrays.stream(type.getMethods())
                .filter(m -> m.getParameterCount() == 0)
                .collect(Collectors.toMap(Method::getName, Function.identity(), ObjectMethodArguments::bridgeMethodMerge)))
        .build();

    private final Map<String, Method> methods;

    
Params:
prefix – an optional prefix (we insert a '.' as a separator)
object – the object to bind functions on/**
     * @param prefix an optional prefix (we insert a '.' as a separator)
     * @param object the object to bind functions on
     */
    public ObjectMethodArguments(String prefix, Object object) {
        super(prefix, object);

        this.methods = CLASS_METHODS.get(object.getClass());
    }

    @Override
    Optional<TypedValue> getValue(String name, StatementContext ctx) {
        Method method = methods.get(name);

        if (method == null) {
            return Optional.empty();
        }

        Type type = method.getGenericReturnType();
        Object value = invokeMethod(method, ctx);

        return Optional.of(new TypedValue(type, value));
    }

    @Override
    NamedArgumentFinder getNestedArgumentFinder(Object obj) {
        return new ObjectMethodArguments(null, obj);
    }

    @Override
    public String toString() {
        return "{lazy object functions arguments \"" + object + "\"";
    }

    private static Method bridgeMethodMerge(Method a, Method b) {
        return (a.isBridge()) ? b : a;
    }
}