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/*
 * Copyright (c) 2017 Cadenza United Kingdom Limited
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.cadenzauk.core.reflect;

import com.cadenzauk.core.reflect.util.ClassUtil;
import com.cadenzauk.core.reflect.util.FieldUtil;
import com.cadenzauk.core.reflect.util.MethodUtil;
import com.cadenzauk.core.util.UtilityClass;
import com.google.common.reflect.TypeToken;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.util.Optional;
import java.util.function.BiConsumer;
import java.util.function.Function;
import java.util.stream.Stream;

import static com.cadenzauk.core.lang.StringUtil.uppercaseFirst;
import static com.cadenzauk.core.reflect.util.TypeUtil.actualTypeArgument;

public final class Setter extends UtilityClass {
    private static final Function WITH_X = s -> "with" + uppercaseFirst(s);
    private static final Function SET_X = s -> "set" + uppercaseFirst(s);
    private static final Function X = Function.identity();

    @SuppressWarnings("unchecked")
    public static  BiConsumer> forField(TypeToken targetClass, Class argType, Field field) {
        return forField((Class) targetClass.getRawType(), argType, field);
    }

    public static  BiConsumer> forField(Class targetClass, Class argType, Field field) {
        Optional setterMethod = Stream.of(WITH_X, SET_X, X)
            .map(f -> f.apply(field.getName()))
            .flatMap(name -> ClassUtil.declaredMethods(targetClass)
                .filter(method -> method.getName().equals(name))
                .filter(method -> method.getParameterCount() == 1)
                .filter(method -> method.getParameterTypes()[0] == Optional.class || method.getParameterTypes()[0] == argType))
            .findFirst();

        return setterMethod
            .map(m -> fromMethod(targetClass, argType, m))
            .orElseGet(() -> Setter.fromField(targetClass, argType, field));
    }

    private static  BiConsumer> fromMethod(Class targetClass, Class argType, Method method) {
        Class parameterType = method.getParameterTypes()[0];
        if (argType.isAssignableFrom(parameterType)) {
            return (t, v) -> MethodUtil.invoke(method, t, v.orElse(null));
        }
        if (parameterType == Optional.class && actualTypeArgument((ParameterizedType) method.getGenericParameterTypes()[0], 0).isAssignableFrom(argType)) {
            return (t, v) -> MethodUtil.invoke(method, t, v);
        }
        throw new IllegalArgumentException(String.format("Cannot convert %s into a BiConsumer<%s,Optional<%s>>.", method, targetClass, argType));
    }

    private static  BiConsumer> fromField(Class targetClass, Class argType, Field field) {
        if (argType.isAssignableFrom(field.getType())) {
            return (t, v) -> FieldUtil.set(field, t, v.orElse(null));
        }
        if (field.getType() == Optional.class && actualTypeArgument((ParameterizedType) field.getGenericType(), 0).isAssignableFrom(argType)) {
            return (t, v) -> FieldUtil.set(field, t, v);
        }
        throw new IllegalArgumentException(String.format("Cannot convert %s into a BiConsumer<%s,Optional<%s>>.", field, targetClass, argType));
    }
}