from selenium import webdriver
from selenium.webdriver.support.ui import WebDriverWait
from selenium.common.exceptions import TimeoutException
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.by import By
from selenium.webdriver.common.print_page_options import PrintOptions
from selenium.webdriver.firefox.service import Service as FirefoxService
from selenium.webdriver.firefox.firefox_profile import FirefoxProfile
from webdriver_manager.firefox import GeckoDriverManager
from pypdf import PdfWriter
import configparser
import os
import sys
import base64
import errno
import glob
import argparse

GECKO_DRIVER = 'gecko'
CHROME_DRIVER = 'chrome'
DEFAULT_CONFIG_PATH = './config.ini'
DEFAULT_OUTPUT_PATH = './'
DEFAULT_WORKING_DIRECTORY = './tmp'
DEFAULT_APP_URL = 'https://app.flightschedulepro.com'
DEFAULT_TIMEOUT = 10 # seconds
DEFAULT_MAX_SESSIONS = 500


parser = argparse.ArgumentParser(
                    prog='FSP Progress Combiner',
                    description='Retrieves progress reports for a given student and combines them into a single PDF',
                    epilog='Kill urself')
parser.add_argument('-c', '--config', default=DEFAULT_CONFIG_PATH)
parser.add_argument('-o', '--output_dir', default=DEFAULT_OUTPUT_PATH)
parser.add_argument('students', nargs='*', help='Name of the student(s) to retrieve sessions for. If a partial name is provided, the first student with a matching name will be retrieved (case insensitive)')
# Useful for debugging
parser.add_argument('-m', '--maximum_sessions', default=DEFAULT_MAX_SESSIONS, type=int, help='Limits the number of sessions retrieved per student')
parser.add_argument('-l', '--list_students', help='Outputs names all students', action='store_true')
parser.add_argument('-s', '--show_browser', help='Show browser window', action='store_true')

args = parser.parse_args()

config = configparser.ConfigParser()

config.read(args.config)
working_dir = config['main'].get('working_directory', DEFAULT_WORKING_DIRECTORY)
app_url = config['main'].get('app_url', DEFAULT_APP_URL)
timeout = config['main'].get('timeout', DEFAULT_TIMEOUT)
tenant_id = config['main'].get('tenant_id')
if tenant_id is None or tenant_id == "":
    print('No Tenant ID configured!')
    sys.exit(1)

try:
    os.makedirs(working_dir)
except OSError as exception:
    if exception.errno != errno.EEXIST:
        raise
    files = glob.glob(os.path.join(working_dir, "*.pdf"))
    for f in files:
        os.remove(f)

# HACK maybe Ubuntu specific 
if config['main'].getboolean('use_working_dir_for_tmp', False):
    os.environ["TMPDIR"] = working_dir

driver_type = config['main']['driver']
# TODO only firefox for now
if driver_type == GECKO_DRIVER:
    opt = webdriver.FirefoxOptions()
    if config['firefox'].get('binary_path') is not None:
        opt.binary_location = config['firefox'].get('binary_path')
    if not args.show_browser:
        opt.add_argument('-headless')
    # Force window size to avoid issues with responsive design
    opt.add_argument("--width=1920")
    opt.add_argument("--height=1080")
    # Disable print dialog. Causes race conditions with window switching
    firefox_profile = FirefoxProfile()
    firefox_profile.set_preference("print.enabled", False)
    opt.profile = firefox_profile
    driver = webdriver.Firefox(options=opt, service=FirefoxService(GeckoDriverManager().install()))
else:
    print(f'unsupported driver type "{driver_type}"')
    sys.exit(1)

# optionally prints a message and cleans up before exiting
def die(message=None):
    if message is not None:
        print(message)
    driver.quit()
    sys.exit(0)

login_url = app_url + '/Account/Login?company='+ tenant_id
driver.get(login_url)

# wait for stupid cookie modal to load and accept all ¯\_(ツ)_/¯
try:
    WebDriverWait(driver, timeout).until(
        EC.presence_of_all_elements_located((By.ID, 'onetrust-accept-btn-handler'))
    )
    cookie_btn = driver.find_element(By.ID, 'onetrust-accept-btn-handler')
    cookie_btn.click()
except:
    pass

# Login
form = driver.find_element(By.CLASS_NAME, 'account-form')
username = driver.find_element(By.ID, 'username')
username.send_keys(config['main']['username'])
username.submit()

try:
    WebDriverWait(driver, timeout).until(
        EC.presence_of_all_elements_located((By.ID, 'password'))
    )
except TimeoutException:
    if len(driver.find_elements(By.XPATH, '//div[@id="alerts"]')) > 0:
        die('Bad username')
    die('unknown authentication error')

password = driver.find_element(By.ID, 'password')
password.send_keys(config['main']['password'])

password.submit()

# Wait for app to load and naviagte to students "page"
try:
    WebDriverWait(driver, timeout).until(
        EC.presence_of_all_elements_located((By.CLASS_NAME, 'fsp-main-drawer-content'))
    )
except TimeoutException:
    if  len(driver.find_elements(By.XPATH, '//div[@id="alerts"]')) > 0:
        die('Bad password')
    die('unknown authentication error')

def get_student_rows():
    driver.get(app_url + '/App/Students')
    WebDriverWait(driver, timeout).until(
        EC.presence_of_all_elements_located((By.XPATH, '//tr[contains(@class, "clickable-course")]'))
    )

    # Get all the student rows and iterate
    student_rows = driver.find_elements(By.XPATH, '//tr[contains(@class, "clickable-course")]')
    return student_rows

# Just list the students if -l switch is passed in
if args.list_students:
    student_rows = get_student_rows()
    for row in student_rows:
        student_name = row.find_element(By.XPATH, './td/div[@class="student"]/div[@class="bold"]').get_attribute("innerText")
        print(student_name)
    die()

for student in args.students:
    student_rows = get_student_rows()
    # Iterate over the student rows to find the desired student
    target = None
    for student_row in student_rows:
        student_name = student_row.find_element(By.XPATH, './td/div[@class="student"]/div[@class="bold"]').get_attribute("innerText")
        if student_name.lower().startswith(student.lower()):
            print(f'Found matching student name "{student_name}"')
            target = student_row
            break
    if target is None:
        print(f'No student with a name matching "{student}" found')
        continue

    student_name_no_space = student_name.replace(' ', '_')

    course_td = target.find_element(By.CLASS_NAME, 'course-td')
    course_td.click()
    WebDriverWait(driver, timeout).until(
        EC.presence_of_all_elements_located((By.XPATH, '//span[text()[contains(., "Sessions")]]'))
    )
    sessions_tab = driver.find_element(By.XPATH, '//span[text()[contains(., "Sessions")]]')
    sessions_tab.click()
    WebDriverWait(driver, timeout).until(
        EC.presence_of_all_elements_located((By.XPATH, '//fsp-ui-button[@Text="View"]'))
    )
    # Ugh... Sessions Table reloads on modal opening after the first modal is opened. So we have to record
    # the count of sessions initially and iterate while reloading the elements each time a button is clicked
    view_btns = driver.find_elements(By.XPATH, '//fsp-ui-button[@Text="View"]')
    btn_count = len(view_btns)

    # Need to save reference to current window since we will be navigating to the printable document that pops up in another window
    original_window = driver.current_window_handle
    for i in range(0, btn_count):
        if i + 1 > args.maximum_sessions:
            print('Reached max sessions')
            break

        print(f'Downloading session {i+1} of {btn_count} for student "{student_name}"')
        # DOM probably reloaded so existing view_btn elements are stale
        view_btns = driver.find_elements(By.XPATH, '//fsp-ui-button[@Text="View"]')
        if len(view_btns) is not btn_count:
            die('session count changed. aborting...')
        view_btns[i].click()
        WebDriverWait(driver, timeout).until(
            EC.presence_of_all_elements_located((By.XPATH, '//fsp-ui-button[@Text="Print"]'))
        )
        print_btn = driver.find_element(By.XPATH, '//fsp-ui-button[@Text="Print"]')
        print_btn.click()

         # Wait for the new window or tab
        WebDriverWait(driver, timeout).until(EC.number_of_windows_to_be(2))

        # Loop through until we find a new window handle
        for window_handle in driver.window_handles:
            if window_handle != original_window:
                driver.switch_to.window(window_handle)
                break
        # Wait for the new tab to finish loading content
        WebDriverWait(driver, timeout).until(EC.title_is('Print Training Session'))

        # Get base64 representation of pdf of the page and write to file 
        print_options = PrintOptions()
        print_options.orientation = "portrait"
        pdf = driver.print_page(print_options)
        with open(os.path.join(working_dir, student_name_no_space + "{:03d}".format(i) + '.pdf'), 'wb') as file:
            file.write(base64.decodebytes(pdf.encode('utf-8')))
        
        # Close the current window
        driver.close()

        # Restore original window
        driver.switch_to.window(original_window)
        WebDriverWait(driver, timeout).until(EC.title_is('Flight Schedule Pro'))
        close_btn = driver.find_element(By.XPATH, '//fsp-ui-button[@Text="Close"]')
        close_btn.click()

    # Merge all Session PDFs for the student
    output_path = os.path.join(args.output_dir, student_name_no_space + '.pdf')
    print(f'Merging PDFs into "{output_path}"')
    writer = PdfWriter()

    # Get all the idividual sessions PDFs for this student
    pdfs = [a for a in os.listdir(working_dir) if a.startswith(student_name_no_space) and a.endswith('.pdf')]
    pdfs.sort()

    # Merge
    for pdf in pdfs:
        writer.append(os.path.join(working_dir, pdf))

    writer.write(output_path)
    writer.close()
# You should really just
die()