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package net.thucydides.core.pages;

import net.thucydides.core.scheduling.NormalFluentWait;
import net.thucydides.core.scheduling.ThucydidesFluentWait;
import org.openqa.selenium.By;
import org.openqa.selenium.NoSuchElementException;
import org.openqa.selenium.NoSuchFrameException;
import org.openqa.selenium.StaleElementReferenceException;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.support.ui.Clock;
import org.openqa.selenium.support.ui.ExpectedCondition;
import org.openqa.selenium.support.ui.ExpectedConditions;
import org.openqa.selenium.support.ui.FluentWait;
import org.openqa.selenium.support.ui.Sleeper;
import org.openqa.selenium.support.ui.SystemClock;
import org.openqa.selenium.support.ui.WebDriverWait;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.List;
import java.util.concurrent.TimeUnit;

/**
 * A page view that handles checking and waiting for element visibility.
 */
class RenderedPageObjectView {

    private final transient WebDriver driver;
    private transient long waitForTimeoutInMilliseconds;
    private final Clock webdriverClock;
    private final Sleeper sleeper;

    private static final int WAIT_FOR_ELEMENT_PAUSE_LENGTH = 50;

    private static final Logger LOGGER = LoggerFactory
            .getLogger(RenderedPageObjectView.class);

    public RenderedPageObjectView(final WebDriver driver, final long waitForTimeout) {
        this.driver = driver;
        this.waitForTimeoutInMilliseconds = waitForTimeout;
        this.webdriverClock = new SystemClock();
        this.sleeper = Sleeper.SYSTEM_SLEEPER;
    }

    public ThucydidesFluentWait waitForCondition() {
        return new NormalFluentWait(driver, webdriverClock, sleeper)
                .withTimeout(waitForTimeoutInMilliseconds, TimeUnit.MILLISECONDS)
                .pollingEvery(WAIT_FOR_ELEMENT_PAUSE_LENGTH, TimeUnit.MILLISECONDS)
                .ignoring(NoSuchElementException.class, NoSuchFrameException.class);
    }

    public FluentWait doWait() {
        return new FluentWait(driver)
                    .withTimeout(waitForTimeoutInMilliseconds, TimeUnit.MILLISECONDS)
                    .pollingEvery(WAIT_FOR_ELEMENT_PAUSE_LENGTH, TimeUnit.MILLISECONDS)
                    .ignoring(NoSuchElementException.class, NoSuchFrameException.class);
    }

    private ExpectedCondition elementDisplayed(final By byElementCriteria) {
        return new ExpectedCondition() {
            public Boolean apply(WebDriver driver) {
                return (elementIsDisplayed(byElementCriteria));
            }
        };
    }

    private ExpectedCondition elementPresent(final By byElementCriteria) {
        return new ExpectedCondition() {
            public Boolean apply(WebDriver driver) {
                return (elementIsDisplayed(byElementCriteria));
            }
        };
    }
    /**
     * This method will wait until an element is present and visible on the screen.
     */
    public void waitFor(final By byElementCriteria) {
        waitForCondition().until(elementDisplayed(byElementCriteria));
    }

    public void waitFor(final ExpectedCondition expectedCondition) {
        doWait().until(expectedCondition);
    }

    /**
     * This method will wait until an element is present on the screen, though not necessarily visible.
     */
    public void waitForPresenceOf(final By byElementCriteria) {
        WebDriverWait wait = new WebDriverWait(driver, (long)(waitForTimeoutInMilliseconds/1000));
        wait.until(ExpectedConditions.presenceOfElementLocated(byElementCriteria));
//        waitForCondition().until(elementPresent(byElementCriteria));
    }

    public boolean elementIsPresent(final By byElementCriteria) {
        boolean isDisplayed = true;
        try {
            List matchingElements = driver.findElements(byElementCriteria);
            if (matchingElements.isEmpty()) {
                isDisplayed = false;
            }
        } catch (NoSuchElementException noSuchElement) {
            LOGGER.trace("No such element " + noSuchElement);
            isDisplayed = false;
        }
        return isDisplayed;
    }

    public boolean elementIsDisplayed(final By byElementCriteria) {
        try {
            List matchingElements = driver.findElements(byElementCriteria);
            for(WebElement webElement : matchingElements) {
                WebElementFacade element = WebElementFacadeImpl.wrapWebElement(driver, webElement, 100);
                if (element.isCurrentlyVisible()) {
                    return true;
                }
            }
            return false;
        } catch (NoSuchElementException noSuchElement) {
            LOGGER.trace("No such element " + noSuchElement);
            return false;
        } catch (StaleElementReferenceException se) {
            LOGGER.trace("Element no longer attached to the DOM " + se);
            return false;
        }
    }

    private boolean matchingElementsArePresent(List matchingElements) {
        return (matchingElements != null) && (!matchingElements.isEmpty());
    }

    private ExpectedCondition textPresent(final String expectedText) {
        return new ExpectedCondition() {
            public Boolean apply(WebDriver driver) {
                return (containsText(expectedText));
            }
        };
    }

    public void waitForText(final String expectedText) {
        waitForCondition().until(textPresent(expectedText));
    }

    private ExpectedCondition textPresentInElement(final WebElement element, final String expectedText) {
        return new ExpectedCondition() {
            public Boolean apply(WebDriver driver) {
                return (containsText(element, expectedText));
            }
        };
    }

    public void waitForText(final WebElement element, final String expectedText) {
        waitForCondition().until(textPresentInElement(element, expectedText));
    }

    private ExpectedCondition titlePresent(final String expectedTitle) {
        return new ExpectedCondition() {
            public Boolean apply(WebDriver driver) {
                return titleIs(expectedTitle);
            }
        };
    }

    public void waitForTitle(final String expectedTitle) {
        waitForCondition().until(titlePresent(expectedTitle));
    }

    private boolean titleIs(final String expectedTitle) {
        return ((driver.getTitle() != null) && (driver.getTitle().equals(expectedTitle)));
    }

    public boolean containsText(final String textValue) {
        return driver.findElement(By.tagName("body")).getText().contains(textValue);
    }

    private boolean foundNo(List elements) {
        return ((elements == null) || (elements.isEmpty()));
    }

    public boolean containsText(final WebElement element, final String textValue) {
        return element.getText().contains(textValue);
    }

    private ExpectedCondition textNotPresent(final String expectedText) {
        return new ExpectedCondition() {
            public Boolean apply(WebDriver driver) {
                return !containsText(expectedText);
            }
        };
    }

    public void waitForTextToDisappear(final String expectedText, final long timeout) {
        waitForCondition()
                .withTimeout(timeout, TimeUnit.MILLISECONDS)
                .until(textNotPresent(expectedText));
    }

	public void waitForTextToAppear(final String expectedText, final long timeout) {
		waitForCondition()
				.withTimeout(timeout, TimeUnit.MILLISECONDS)
				.until(textPresent(expectedText));
	}

    private ExpectedCondition titleNotPresent(final String expectedTitle) {
        return new ExpectedCondition() {
            public Boolean apply(WebDriver driver) {
                return !titleIs(expectedTitle);
            }
        };
    }

    public void waitForTitleToDisappear(final String expectedTitle) {
        waitForCondition().until(titleNotPresent(expectedTitle));
    }

    private ExpectedCondition anyTextPresent(final String... expectedTexts) {
        return new ExpectedCondition() {
            public Boolean apply(WebDriver driver) {
                return pageContainsAny(expectedTexts);
            }
        };
    }

    public void waitForAnyTextToAppear(final String... expectedTexts) {
        waitForCondition().until(anyTextPresent(expectedTexts));
    }

    private ExpectedCondition anyTextPresentInElement(final WebElement element, final String... expectedTexts) {
        return new ExpectedCondition() {
            public Boolean apply(WebDriver driver) {
                return elementContains(element, expectedTexts);
            }
        };
    }

    public void waitForAnyTextToAppear(final WebElement element, final String... expectedTexts) {
        waitForCondition().until(anyTextPresentInElement(element, expectedTexts));
    }

    private boolean elementContains(final WebElement element, final String... expectedTexts) {
        for (String expectedText : expectedTexts) {
            if (containsText(element, expectedText)) {
                return true;
            }
        }
        return false;
    }

    private boolean pageContainsAny(final String... expectedTexts) {
        for (String expectedText : expectedTexts) {
            if (containsText(expectedText)) {
                return true;
            }
        }
        return false;
    }

    private ExpectedCondition allTextPresent(final String... expectedTexts) {
        return new ExpectedCondition() {
            public Boolean apply(WebDriver driver) {
                for(String expectedText : expectedTexts) {
                    if (!containsText(expectedText)) {
                        return false;
                    }
                }
                return true;
            }
        };
    }

    public void waitForAllTextToAppear(final String... expectedTexts) {
        waitForCondition().until(allTextPresent(expectedTexts));
    }

    private ExpectedCondition elementNotDisplayed(final By byElementCriteria) {
        return new ExpectedCondition() {
            public Boolean apply(WebDriver driver) {
                return (!elementIsDisplayed(byElementCriteria));
            }
        };
    }

    public void waitForElementsToDisappear(final By byElementCriteria) {
        waitForCondition().until(elementNotDisplayed(byElementCriteria));
    }

    private ExpectedCondition anyElementPresent(final By... expectedElements) {
        return new ExpectedCondition() {
            public Boolean apply(WebDriver driver) {
                for(By expectedElement : expectedElements) {
                    if (elementIsDisplayed(expectedElement)) {
                        return true;
                    }
                }
                return false;
            }
        };
    }
    public void waitForAnyRenderedElementOf(final By[] expectedElements) {
        waitForCondition().until(anyElementPresent(expectedElements));
    }

    public void setWaitForTimeoutInMilliseconds(long waitForTimeoutInMilliseconds) {
        this.waitForTimeoutInMilliseconds = waitForTimeoutInMilliseconds;
    }
}