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/*
 * Copyright 2013 Alexei Barantsev
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */
package ru.stqa.selenium.wait;

import java.util.List;

import org.openqa.selenium.By;
import org.openqa.selenium.SearchContext;
import org.openqa.selenium.WebElement;

import com.google.common.base.Function;

public class ExpectedConditions {

  private ExpectedConditions() {
    // Utility class
  }

  public static ExpectedCondition element(
      final WebElement element, final Function condition) {
    return new ExpectedCondition() {
      @Override
      public WebElement apply(SearchContext context) {
        if (element != null && condition.apply(element)) {
          return element;
        } else {
          return null;
        }
      }
    };
  }

  public static ExpectedCondition firstElementLocated(
        final By locator, final Function condition) {
    return new ExpectedCondition() {
      @Override
      public WebElement apply(SearchContext context) {
        WebElement element = findElement(context, locator);
        if (element != null) {
          return condition.apply(element) ? element : null;
        } else {
          return null;
        }
      }
    };
  }

  public static ExpectedCondition someElementLocated(
      final By locator, final Function condition) {
    return new ExpectedCondition() {
      @Override
      public WebElement apply(SearchContext context) {
        List elements = context.findElements(locator);
        for (WebElement element : elements) {
          if (element != null && condition.apply(element)) {
            return element;
          }
        }
        return null;
      }
    };
  }

  public static ExpectedCondition> eachElementLocated(
      final By locator, final Function condition) {
    return new ExpectedCondition>() {
      @Override
      public List apply(SearchContext context) {
        List elements = context.findElements(locator);
        for (WebElement element : elements) {
          if (! condition.apply(element)) {
            return null;
          }
        }
        return elements;
      }
    };
  }

  public static ExpectedCondition> listOfElementsLocated(
      final By locator, final Function, Boolean> condition) {
    return new ExpectedCondition>() {
      @Override
      public List apply(SearchContext context) {
        List elements = context.findElements(locator);
        return condition.apply(elements) ? elements : null;
      }
    };
  }

  private static WebElement findElement(SearchContext context, By locator) {
    List elements = context.findElements(locator);
    return elements.size() > 0 ? elements.get(0) : null;
  }
}