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package atom.widget;

import atom.view.View;

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlRootElement;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.Objects;

/**
 * A view that displays one child at a time and lets the user pick among them.
 * The items in the Spinner come from the {@link Adapter} associated with
 * this view.
 *
 * @author Alex Voloshyn
 * @author Serge Voloshyn
 * @author Vladimir Ovcharov
 * @version 1.6 2/24/15
 */
@XmlRootElement(name = "Spinner")
public final class Spinner extends AdapterView {
    /**
     * Use serialVersionUID from JDK 1.0.2 for interoperability.
     */
    private static final long serialVersionUID = -4418272632913094008L;
    /**
     * Reference to an array resource that will populate the Spinner.
     */
    private transient String entries = null;

    /**
     * Simple constructor to use when creating a view group from code.
     */
    public Spinner() {
        super();
    }

    /**
     * Simple constructor that creates Spinner with defined
     * identifier.
     *
     * @param viewId a string used to identify the view
     * @see #setViewId(String)
     */
    public Spinner(final String viewId) {
        super(viewId);
    }

    /**
     * Sets reference to an array resource that will populate the Spinner.
     *
     * @param reference reference to an array resource that will populated
     */
    @XmlAttribute(name = "entries")
    public void setEntries(final String reference) {
        entries = reference;
    }

    @Override
    public void adapt() {
        if (entries != null) {
            setAdapter(ArrayAdapter.createFromResource(
                    ArrayAdapter.COMMON_RESOURCES, entries,
                    Locale.ENGLISH));
        }
        final SpinnerAdapter adapter = getAdapter();
        if (adapter != null) {
            getChildren().clear();
            final List list = new ArrayList<>(adapter.getCount());
            for (int i = 0; i < adapter.getCount(); i++) {
                list.add(adapter.getDropDownView(i, null, this));
            }
            setChildren(list);
        }
    }

    @Override
    public boolean equals(final Object object) {
        boolean areEquals;
        if (this == object) {
            areEquals = true;
        } else {
            if (object instanceof Spinner) {
                final Spinner that = (Spinner) object;
                areEquals = super.equals(that)
                        && Objects.equals(getChildren(), that.getChildren())
                        && Objects.equals(entries, that.entries)
                        && Objects.equals(getSelectedItemPosition(),
                        that.getSelectedItemPosition());
            } else {
                areEquals = false;
            }
        }
        return areEquals;
    }

    @Override
    public int hashCode() {
        return Objects.hash(getViewId());
    }

    @Override
    public String toString() {
        return String.format(
                "Spinner { viewId='%s', styleName='%s',"
                        + " eventBits='%d', children='%s', selected='%d',"
                        + " entries='%s' }",
                getViewId(), getStyleName(), getEventBits(),
                getChildren(), getSelectedItemPosition(), entries);
    }
}