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package net.serenitybdd.screenplay.questions;

import net.serenitybdd.core.pages.WebElementFacade;
import net.serenitybdd.core.pages.WebElementState;
import net.serenitybdd.screenplay.Question;
import net.serenitybdd.screenplay.abilities.BrowseTheWeb;
import net.serenitybdd.screenplay.targets.Target;
import org.openqa.selenium.By;

import java.util.List;
import java.util.stream.Collectors;

import static java.util.Collections.singletonList;

/**
 * Is this web element present and visible on the screen
 * This method will not throw an exception if the element is not on the screen at all.
 * If the element is not visible, the method will wait a bit to see if it appears later on.
 */
public class Visibility {

    public static Question of(Target target) {
        return Question.about("visibility of " + target.getName()).answeredBy(actor -> matches(target.resolveAllFor(actor)));
    }

    public static Question of(By byLocator) {
        return Question.about("visibility of element located by " + byLocator).answeredBy(actor -> matches(BrowseTheWeb.as(actor).findAll(byLocator)));
    }

    public static Question of(String locator) {
        return Question.about("visibility of " + locator).answeredBy(actor -> matches(BrowseTheWeb.as(actor).findAll(locator)));
    }

    public static Question> ofEach(Target target) {
        return Question.about("visibility of each " + target.getName()).answeredBy(actor -> target.resolveAllFor(actor)
                .stream()
                .map(element -> matches(singletonList(element)))
                .collect(Collectors.toList()));
    }

    public static Question> ofEach(By byLocator) {
        return Question.about("visibility of element located by " + byLocator).answeredBy(actor -> BrowseTheWeb.as(actor).findAll(byLocator)
                .stream()
                .map(element -> matches(singletonList(element)))
                .collect(Collectors.toList()));
    }

    public static Question> ofEach(String locator) {
        return Question.about("visibility of each" + locator).answeredBy(actor -> BrowseTheWeb.as(actor).findAll(locator)
                .stream()
                .map(element -> matches(singletonList(element)))
                .collect(Collectors.toList()));
    }

    private static boolean matches(List elements) {
        return elements.stream()
                .findFirst()
                .map(WebElementState::isVisible)
                .orElse(false);
    }
}