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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.TypeUtil;
import com.google.common.reflect.TypeToken;

import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.util.Arrays;
import java.util.NoSuchElementException;
import java.util.Objects;
import java.util.Optional;
import java.util.function.Function;

import static com.cadenzauk.core.reflect.util.FieldUtil.genericTypeArgument;

public class FieldInfo {
    private final Class declaringClass;
    private final Field field;
    private final Class effectiveType;
    private final Function> optionalGetter;

    private FieldInfo(Class declaringClass, Field field, Class effectiveType) {
        Objects.requireNonNull(declaringClass, "declaringClass");
        Objects.requireNonNull(field, "field");
        Objects.requireNonNull(effectiveType, "effectiveType");
        this.declaringClass = declaringClass;
        this.field = field;
        this.effectiveType = effectiveType;
        this.optionalGetter = Getter.forField(declaringClass, effectiveType, field);
    }

    @Override
    public String toString() {
        return String.format("%s %s.%s", TypeUtil.toString(field.getGenericType()), TypeUtil.toString(field.getDeclaringClass()), field.getName());
    }

    public TypeToken declaringType() {
        return TypeToken.of(declaringClass);
    }

    public Class declaringClass() {
        return declaringClass;
    }

    public Field field() {
        return field;
    }

    public String name() {
        return field.getName();
    }

    public Class fieldType() {
        return field.getType();
    }

    public Class effectiveType() {
        return effectiveType;
    }

    public Function> optionalGetter() {
        return optionalGetter;
    }

    public  Optional annotation(Class annotation) {
        return FieldUtil.annotation(annotation, field);
    }

    @SuppressWarnings("unchecked")
    public static  FieldInfo of(Class declaringClass, Field field) {
        if (field.getType() == Optional.class) {
            return genericTypeArgument(field, 0)
                .map(cls -> of(declaringClass, field, cls))
                .orElseThrow(() -> new IllegalArgumentException("Unable to determine the type of Optional field " + field.getName() + " in " + declaringClass));
        }
        return of(declaringClass, field, field.getType());
    }

    public static  FieldInfo of(Class rowClass, Field field, Class fieldType) {
        return new FieldInfo<>(rowClass, field, fieldType);
    }

    public static  FieldInfo of(Class objectClass, String fieldName, Class fieldType) {
        return ClassUtil.findField(objectClass, fieldName)
            .filter(f -> isCompatibleWith(f, fieldType))
            .map(f -> of(objectClass, f, fieldType))
            .orElseThrow(() -> new NoSuchElementException("No field called " + fieldName + " of type " + fieldType + " in " + objectClass));
    }

    public static  Optional> ofGetter(MethodInfo getter) {
        return Arrays.stream(getter.declaringClass().getDeclaredFields())
            .filter(f -> getter.actualType().isAssignableFrom(f.getType()))
            .filter(f -> Getter.isGetter(getter.method(), f))
            .findAny()
            .map(f -> of(getter.declaringClass(), f, getter.effectiveType()));
    }

    private static boolean isCompatibleWith(Field field, Class targetType) {
        if (targetType.isAssignableFrom(field.getType())) {
            return true;
        }
        if (field.getType() == Optional.class) {
            return genericTypeArgument(field, 0)
                .map(targetType::isAssignableFrom)
                .orElse(false);
        }
        return false;
    }
}
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