const webdriver = require('selenium-webdriver')

const Twait = 20000

class Page {
  constructor(driver) {
    this.driver = driver
  }

  async waitUntilDisplayed(element, Twaiting) {
    let counter = Twaiting
    if (counter === undefined) counter = 180
    try {
      do {
        await this.driver.sleep(300)
        if (await this.isElementDisplayed(element)) return true
      } while (counter-- > 0)
      return false
    } catch (err) {
      return false
    }
  }

  async waitUntilDisappear(element, Twaiting) {
    let counter = Twaiting
    if (counter === undefined) counter = 180
    try {
      do {
        await this.driver.sleep(300)
        if (!(await this.isElementDisplayed(element))) return true
      } while (counter-- > 0)
      return false
    } catch (err) {
      return false
    }
  }

  async waitUntilLocated(element, Twaiting) {
    let counter = Twaiting
    if (counter === undefined) counter = 180
    try {
      do {
        await this.driver.sleep(300)
        if (await this.isElementLocated(element)) return true
      } while (counter-- > 0)
      return false
    } catch (err) {
      return false
    }
  }

  async isElementDisplayed(element) {
    try {
      return await this.driver.findElement(element).isDisplayed()
    } catch (err) {
      return false
    }
  }

  async isElementLocated(element) {
    return (await this.driver.findElements(element)).length > 0
  }

  async clickWithWait(element) {
    try {
      let field
      if (element.constructor.name !== 'WebElement') {
        field = await this.driver.wait(webdriver.until.elementLocated(element), Twait)
      } else field = element
      await field.click()
      return true
    } catch (err) {
      return false
    }
  }

  async fillWithWait(element, text) {
    try {
      let field
      if (element.constructor.name !== 'WebElement') {
        field = await this.driver.wait(webdriver.until.elementLocated(element), Twait)
      } else field = element
      await field.sendKeys(text)
      return true
    } catch (err) {
      return false
    }
  }

  async findWithWait(element) {
    try {
      await this.driver.wait(webdriver.until.elementLocated(element), Twait)
      return await this.driver.findElements(element)
    } catch (err) {
      return null
    }
  }

  async switchToNextPage() {
    let allHandles = []
    let curHandle
    try {
      allHandles = await this.driver.getAllWindowHandles()
      curHandle = await this.driver.getWindowHandle()
      if (allHandles.length > 2) {
        allHandles = [allHandles[0], allHandles[1]]
      }
      let handle
      for (let i = 0; i < allHandles.length; i++) {
        if (curHandle !== allHandles[i]) {
          handle = allHandles[i]
          break
        }
      }
      await this.driver.switchTo().window(handle)
      await this.driver.sleep(500)
      return true
    } catch (err) {
      return false
    }
  }

  async refresh() {
    await this.driver.navigate().refresh()
  }

  async getUrl() {
    return await this.driver.getCurrentUrl()
  }

  async open(url) {
    await this.driver.get(url)
    return this.getUrl()
  }

  async clickKey(key, times) {
    try {
      const action = this.driver.actions()
      for (let i = 0; i < times; i++) await action.sendKeys(key).perform()
      return true
    } catch (err) {
      return false
    }
  }
}

module.exports = {
  Page
}