import os
import re
import requests
import warnings
import pandas as pd
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys
from selenium.common.exceptions import TimeoutException
from selenium.webdriver.support.ui import WebDriverWait, Select
from selenium.webdriver.support import expected_conditions as EC


def has_admin():
    """Check if current user has admin rights.
    https://stackoverflow.com/questions/2946746
    """
    if os.name == 'nt':
        try:
            # Check if C:/Windows/temp is readable for current user
            os.listdir(os.path.join(os.environ.get('systemroot'), 'temp'))
        except PermissionError:
            return False
        else:
            return True
    else:
        if 'SUDO_USER' in os.environ and os.geteuid() == 0:
            return True
        else:
            return False


def return_to_master_frame(driver):
    driver.switch_to.default_content()
    webhyd = driver.find_element_by_id('webhyd')
    driver.switch_to.frame(webhyd)


def wait_for_element(driver, by, x, timeout=10):
    try:
        element_present = EC.presence_of_element_located((by, x))
        WebDriverWait(driver, timeout).until(element_present)
    except TimeoutException:
        print("Timed out waiting for page to load")


def get_telemetered_bore(driver, bore_id, start_date, end_date):
    driver.switch_to.default_content()
    webhyd = driver.find_element_by_id('webhyd')
    driver.switch_to.frame(webhyd)

    # Load site specific page
    driver.execute_script("go('{}','gw', 1)".format(bore_id))

    # Wait for results frame to load
    WebDriverWait(
        driver, timeout=20).until(
            EC.frame_to_be_available_and_switch_to_it('gwgwlf_org'))
    wait_for_element(driver, By.XPATH, '//*[@id="tabstext"]')

    # Activate outputs tab, and wait for 'Get Output' button
    driver.execute_script("menuloc.display_frame('gw','gwcf_org','1')")
    driver.switch_to.parent_frame()
    WebDriverWait(
        driver, timeout=20).until(
            EC.frame_to_be_available_and_switch_to_it('gwgwcf_org'))
    wait_for_element(driver, By.ID, 'submit')

    # Get output select controls
    selects = driver.find_elements_by_xpath('//*/select')
    for select in selects:
        s = Select(select)
        label = s.options[0].get_attribute('label')
        if label == 'All data':
            period = s
        elif label == 'Plot':
            output = s
        elif label == 'Annual':
            interval = s

    # Change period dropdown to 'Custom'
    period.select_by_visible_text('Custom')

    # Get date input fields
    fields = driver.find_elements_by_xpath('//*[starts-with(@id,"cdate")]')

    # Parse dates
    start_date = pd.to_datetime(start_date)
    end_date = pd.to_datetime(end_date)

    # Update fields with specified dates
    for field, date in zip(fields, [start_date, end_date]):
        field.clear()
        field.send_keys(pd.datetime.strftime(date, '%H:%M_%d/%m/%Y'))

    # Set output dropdown to 'Download'
    output.select_by_visible_text('Download')

    # Set interval dropdown to 'All points'
    interval.select_by_visible_text('All points')

    # Make sure 'Groundwater Level - AHD' is selected as an output
    checkbox = driver.find_element_by_xpath(
        '//*/input[contains(@name, "sel__110.00_115.00")]')
    if not checkbox.get_attribute('selected'):
        checkbox.click()

    # Download data
    driver.execute_script("get_output()")
    driver.execute_script("hide_object('confirm');co(level,tab,1)")

    # Close popup
    wait_for_element(driver, By.XPATH,
                     "//div[contains(@class, 'lity-container')]")
    webdriver.ActionChains(driver).send_keys(Keys.ESCAPE).perform()


def open_browser():
    # Warn if user does not have admin privileges
    if not has_admin():
        warnings.warn('This program should be run as an administrator.')

    # Open browser
    driver = webdriver.Chrome()

    url = 'https://realtimedata.waternsw.com.au/water.stm'
    driver.get(url)

    return driver


def main():
    driver = open_browser()
    bore_ids = [
        'GW036367.1.1',
        'GW036211.1.1',
        'GW036588.4.4',
        'GW036572.1.1',
    ]

    start_date = '2018-01-01'
    end_date = '2018-06-01'

    # Download bore logs
    for bore_id in bore_ids:
        print('Downloading {}...'.format(bore_id))
        get_telemetered_bore(driver, bore_id, start_date, end_date)

    driver.quit()


main()