"""
Copyright (C) 2022 Sebastian Thomschke and contributors
SPDX-License-Identifier: AGPL-3.0-or-later
"""
from decimal import DecimalException

from selenium.common.exceptions import NoSuchElementException
from selenium.webdriver.common.by import By
from selenium.webdriver.remote.webdriver import WebDriver

from .utils import parse_decimal


class AdExtractor:
    """
    Wrapper class for ad extraction that uses an active bot´s web driver to extract specific elements from an ad page.
    """

    def __init__(self, driver:WebDriver):
        self.driver = driver

    def extract_category_from_ad_page(self) -> str:
        """
        Extracts a category of an ad in numerical form.
        Assumes that the web driver currently shows an ad page.

        :return: a category string of form abc/def, where a-f are digits
        """
        category_line = self.driver.find_element(By.XPATH, '//*[@id="vap-brdcrmb"]')
        category_first_part = category_line.find_element(By.XPATH, './/a[2]')
        category_second_part = category_line.find_element(By.XPATH, './/a[3]')
        cat_num_first = category_first_part.get_attribute('href').split('/')[-1][1:]
        cat_num_second = category_second_part.get_attribute('href').split('/')[-1][1:]
        category:str = cat_num_first + '/' + cat_num_second

        return category

    def extract_special_attributes_from_ad_page(self) -> dict:
        """
        Extracts the special attributes from an ad page.

        :return: a dictionary (possibly empty) where the keys are the attribute names, mapped to their values
        """

        try:
            details_box = self.driver.find_element(By.CSS_SELECTOR, '#viewad-details')
            details_list = details_box.find_element(By.XPATH, './/ul')
            list_items = details_list.find_elements(By.TAG_NAME, 'li')
            details = {}
            for list_item in list_items:
                detail_key = list_item.text.split('\n')[0]
                detail_value = list_item.find_element(By.TAG_NAME, 'span').text
                details[detail_key] = detail_value

            return details
        except NoSuchElementException:
            return {}

    def extract_pricing_info_from_ad_page(self) -> (float | None, str):
        """
        Extracts the pricing information (price and pricing type) from an ad page.

        :return: the price of the offer (optional); and the pricing type
        """
        try:
            price_str:str = self.driver.find_element(By.CLASS_NAME, 'boxedarticle--price').text
            price_type:str
            price:float | None = -1
            match price_str.split()[-1]:
                case '€':
                    price_type = 'FIXED'
                    price = float(parse_decimal(price_str.split()[0].replace('.', '')))
                case 'VB':  # can be either 'X € VB', or just 'VB'
                    price_type = 'NEGOTIABLE'
                    try:
                        price = float(parse_decimal(price_str.split()[0].replace('.', '')))
                    except DecimalException:
                        price = None
                case 'verschenken':
                    price_type = 'GIVE_AWAY'
                    price = None
                case _:
                    price_type = 'NOT_APPLICABLE'
            return price, price_type
        except NoSuchElementException:  # no 'commercial' ad, has no pricing box etc.
            return None, 'NOT_APPLICABLE'

    def extract_shipping_info_from_ad_page(self) -> (str, float | None):
        """
        Extracts shipping information from an ad page.

        :return: the shipping type, and the shipping price (optional)
        """
        ship_type, ship_costs = 'NOT_APPLICABLE', None
        try:
            shipping_text = self.driver.find_element(By.CSS_SELECTOR, '.boxedarticle--details--shipping') \
                .text.strip()
            # e.g. '+ Versand ab 5,49 €' OR 'Nur Abholung'
            if shipping_text == 'Nur Abholung':
                ship_type = 'PICKUP'
            elif shipping_text == 'Versand möglich':
                ship_type = 'SHIPPING'
            elif '€' in shipping_text:
                shipping_price_parts = shipping_text.split(' ')
                shipping_price = float(parse_decimal(shipping_price_parts[-2]))
                ship_type = 'SHIPPING'
                ship_costs = shipping_price
        except NoSuchElementException:  # no pricing box -> no shipping given
            ship_type = 'NOT_APPLICABLE'

        return ship_type, ship_costs

    def extract_contact_from_ad_page(self) -> dict:
        """
        Processes the address part involving street (optional), zip code + city, and phone number (optional).

        :return: a dictionary containing the address parts with their corresponding values
        """
        contact = {}
        address_element = self.driver.find_element(By.CSS_SELECTOR, '#viewad-locality')
        address_text = address_element.text.strip()
        # format: e.g. (Beispiel Allee 42,) 12345 Bundesland - Stadt
        try:
            street_element = self.driver.find_element(By.XPATH, '//*[@id="street-address"]')
            street = street_element.text[:-2]  # trailing comma and whitespace
            contact['street'] = street
        except NoSuchElementException:
            print('No street given in the contact.')
        # construct remaining address
        address_halves = address_text.split(' - ')
        address_left_parts = address_halves[0].split(' ')  # zip code and region/city
        contact['zipcode'] = address_left_parts[0]

        contact_person_element = self.driver.find_element(By.CSS_SELECTOR, '#viewad-contact')
        name_element = contact_person_element.find_element(By.CLASS_NAME, 'iconlist-text')
        name = name_element.find_element(By.TAG_NAME, 'a').text
        contact['name'] = name

        if 'street' not in contact:
            contact['street'] = None
        try:  # phone number is unusual for non-professional sellers today
            phone_element = self.driver.find_element(By.CSS_SELECTOR, '#viewad-contact-phone')
            phone_number = phone_element.find_element(By.TAG_NAME, 'a').text
            contact['phone'] = ''.join(phone_number.replace('-', ' ').split(' ')).replace('+49(0)', '0')
        except NoSuchElementException:
            contact['phone'] = None  # phone seems to be a deprecated feature (for non-professional users)
        # also see 'https://themen.ebay-kleinanzeigen.de/hilfe/deine-anzeigen/Telefon/

        return contact