import logging
import re
import random
import dbhelper
import constants
import helpers
import product_parser
import time

from amazoncaptcha import AmazonCaptcha
from bs4 import BeautifulSoup
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.common.by import By
from selenium.webdriver.chrome.options import Options
from selenium import webdriver
from telegram import Update, ForceReply, InlineKeyboardButton, InlineKeyboardMarkup
from telegram.ext import Updater, CommandHandler, MessageHandler, Filters, CallbackContext
from amazon_product import AmazonProduct


def get_chrome_options():
    chrome_options = Options()
    chrome_options.add_argument("--headless")
    chrome_options.add_argument("--no-sandbox")
    chrome_options.add_argument("--disable-dev-shm-usage")
    chrome_prefs = {}
    chrome_prefs["profile.default_content_settings"] = {"images": 2}
    chrome_options.experimental_options["prefs"] = chrome_prefs
    return chrome_options


def create_selenium_driver(options: Options):
    logging.info("Setting up new Chrome Browser")
    driver = webdriver.Chrome(options=options)
    driver.set_window_size(random.randint(1200, 1800), random.randint(600, 1000))
    return driver


def load_page(url: str, driver: webdriver, screenshot_type=""):
    logging.info(f"Loading webpage {url}")
    driver.get(url)
    driver.save_screenshot(f"/app/data/images/last_iteration/last_screenshot{screenshot_type}.png")
    return driver.page_source


def extract_amazon_url_with_referer(text: str):
    productCode = ""
    extraparams = ""

    start = text.find("amzn.to")
    if start != -1:
        text = helpers.unshort_url(text[start:].split()[0])
    start = text.find("amzn.eu")
    if start != -1:
        text = helpers.unshort_url(text[start:].split()[0])
    start = text.find(constants.searchURL)
    if start != -1:
        text = f"https://{text[start:].split(' ')[0]}"
        m = re.search(r'(?:dp\/[\w]*)|(?:gp\/product\/[\w]*)',text) # Gets product code in amazon
        m_e = re.search(r'(?:&m=[\w]*)',text) # Gets vendor and keeps it
        if m != None:
            productCode = m.group(0)
        if m_e != None:
            extraparams = m_e.group(0)
        return helpers.new_refer_url(productCode, extraparams)


def resolve_captcha(driver: webdriver):
    logging.info("Trying to resolve captcha")
    captcha = AmazonCaptcha.fromdriver(driver)
    solution = captcha.solve()    
    return solution if solution != 'Not solved' else None


def apply_captcha(captcha_solution: str, driver: webdriver):
    logging.info(f"Captcha solution is {captcha_solution}, redirecting")
    logging.info("Waiting for 5 seconds, humans are not that fast :)")
    time.sleep(5)
    fill_captcha_element = driver.find_element(By.ID, 'captchacharacters')
    fill_captcha_element.send_keys(captcha_solution)
    fill_captcha_element.send_keys(Keys.RETURN)


def scrape_data(page_html: str) -> AmazonProduct:
    logging.info("Scraping information")
    soup = BeautifulSoup(page_html, "lxml")
    etree_soup = BeautifulSoup(page_html, "html.parser")

    title, price, image = product_parser.get_title(soup), product_parser.get_price(soup), product_parser.get_image(soup, etree_soup)
    return AmazonProduct(title=title, price=price, image=image) if title != "" else None


def find_amazon_link(update: Update, context: CallbackContext) -> None:
    try:
        msg = update.message.text
    except AttributeError:
        logging.info(f"Received message has no text")
        return
    
    user, chat, chat_id, message_id = update.message.from_user, update.message.chat, update.message.chat_id, update.message.message_id
    
    amazon_url_with_referer = extract_amazon_url_with_referer(msg)

    if amazon_url_with_referer:
        logging.info(f"Link sent by {user} - {msg}")
        with create_selenium_driver(get_chrome_options()) as chrome_driver:
            logging.info("Loading page for scraping information")
            page_html = load_page(url=amazon_url_with_referer, driver=chrome_driver)
            product_data = scrape_data(page_html) 
            
            if not product_data:
                logging.info(f"Title not found, not a valid product or captcha")

                captcha_solution = resolve_captcha(chrome_driver)

                if captcha_solution:
                    apply_captcha(captcha_solution, chrome_driver)

                    logging.info("Re-loading Amazon webpage")
                    page_html = load_page(url=amazon_url_with_referer, driver=chrome_driver, screenshot_type="_aftercaptcha")
                    product_data = scrape_data(page_html)
                else:
                    logging.info("Couldn't solve the captcha, if there was any")

                if not product_data: #if after applying the captcha we don't have any data yet, stop the execution and reply to the user
                    logging.info("Unable to get the product information")
                    context.bot.send_message(chat_id=chat_id, text="Unable to get product attributes from the provided url", reply_to_message_id=message_id)
                    return
                    
        logging.info(f"Product information found: {product_data}")

        context.bot.deleteMessage(chat_id=chat_id, message_id=message_id)
        product_id = dbhelper.check_product(amazon_url_with_referer, product_data.price)
        if not product_id:
            product_id = dbhelper.add_product(user['username'], chat['title'], user['id'], chat_id, msg, amazon_url_with_referer, product_data.title, product_data.price, product_data.image)
        helpers.create_image(product_id, product_data.price)
        keyboard = [[InlineKeyboardButton("Ir a Amazon", url=f"{amazon_url_with_referer}")]]
        markup = InlineKeyboardMarkup(keyboard)
        context.bot.send_photo(chat_id=chat_id, photo=open(f"/app/data/images/products/{product_id}_composed.png", 'rb'), caption=f"URL enviada por @{user['username']}: \n\n{product_data.title}", reply_markup=markup)


def main() -> None:
    dbhelper.setup_db()

    updater = Updater(constants.TELEGRAM_API_KEY)
    dispatcher = updater.dispatcher
    dispatcher.add_handler(MessageHandler(Filters.text & ~Filters.command, find_amazon_link))
    updater.start_polling()
    updater.idle()


if __name__ == '__main__':
    main()