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/*     / \____  _    _  ____   ______  / \ ____  __    _______
 *    /  /    \/ \  / \/    \ /  /\__\/  //    \/  \  //  /\__\   JΛVΛSLΛNG
 *  _/  /  /\  \  \/  /  /\  \\__\\  \  //  /\  \ /\\/ \ /__\ \   Copyright 2014-2016 Javaslang, http://javaslang.io
 * /___/\_/  \_/\____/\_/  \_/\__\/__/\__\_/  \_//  \__/\_____/   Licensed under the Apache License, Version 2.0
 */
package javaslang.match.model;

import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.DeclaredType;
import javax.lang.model.util.Elements;
import java.util.List;

import static java.util.stream.Collectors.toList;

/**
 * Representation of a class.
 *
 * @author Daniel Dietrich
 * @since 2.0.0
 */
public class ClassModel {

    private final Elements elementUtils;
    private final DeclaredType declaredType;

    public static ClassModel of(Elements elementUtils, TypeElement typeElement) {
        return new ClassModel(elementUtils, (DeclaredType) typeElement.asType());
    }

    public ClassModel(Elements elementUtils, DeclaredType declaredType) {
        this.elementUtils = elementUtils;
        this.declaredType = declaredType;
    }

    public TypeElement typeElement() {
        return (TypeElement) declaredType.asElement();
    }

    // returns the simple name for top level class and the combined class name for inner classes
    public String getClassName() {
        final String fqn = getFullQualifiedName();
        return hasDefaultPackage() ? fqn : fqn.substring(getPackageName().length() + 1);
    }

    public String getFullQualifiedName() {
        return typeElement().getQualifiedName().toString();
    }

    public List getMethods() {
        return typeElement().getEnclosedElements().stream()
                .filter(element -> {
                    final String name = element.getSimpleName().toString();
                    return element instanceof ExecutableElement && !name.isEmpty() && !"".equals(name) && !"".equals(name);
                })
                .map(element -> new MethodModel(elementUtils, (ExecutableElement) element))
                .collect(toList());
    }

    public String getPackageName() {
        return elementUtils.getPackageOf(typeElement()).getQualifiedName().toString();
    }

    public List getTypeParameters() {
        return declaredType.getTypeArguments().stream()
                .map(typeMirror -> new TypeParameterModel(elementUtils, typeMirror))
                .collect(toList());
    }

    public boolean hasDefaultPackage() {
        return elementUtils.getPackageOf(typeElement()).isUnnamed();
    }

    @Override
    public boolean equals(Object o) {
        return (o == this) || (o instanceof ClassModel && toString().equals(o.toString()));
    }

    @Override
    public int hashCode() {
        return toString().hashCode();
    }

    @Override
    public String toString() {
        return declaredType.toString();
    }
}