from bs4 import BeautifulSoup
from flask.testing import FlaskClient
from tests.base_test import TestBase


class TestFunctionalRequirements(TestBase):
    def test_product_filters(self, test_client: FlaskClient):
        base_url = '/products/Car Part?filter={{FILTER}}'

        # Make get request for all products in car parts
        response = test_client.get(
            base_url.replace("{{FILTER}}", "Price: High -> Low")
        )
        assert response.status_code == 200

        # Extract first and last product
        first, last = self.get_first_and_last_product(response.data)

        # Get Prices of each
        first_cost = float(self.get_tag_value(
            str(first), "product-price").replace('£', '')
        )
        last_cost = float(self.get_tag_value(
                str(last), "product-price").replace('£', '')
        )

        # Check filter is working
        assert first_cost >= last_cost

        # =============================================
        # Test the reverse of the previous filter
        # Get html data
        response = test_client.get(
            base_url.replace("{{FILTER}}", "Price: Low -> High")
        )
        assert response.status_code == 200

        # Extract first and last product
        first, last = self.get_first_and_last_product(response.data)

        # Get Prices of each
        first_cost = float(self.get_tag_value(
            str(first), "product-price").replace('£', '')
        )
        last_cost = float(self.get_tag_value(
                str(last), "product-price").replace('£', '')
        )

        # Check filter is working
        assert first_cost <= last_cost

    def get_tag_value(self, html: str, class_name: str) -> str:
        """ Returns the value of a given tag in a html element """
        soup = BeautifulSoup(html, features='html.parser')
        return str(soup.find("div", {'class': class_name}).contents[0])

    def get_first_and_last_product(self, html: str) -> (str, str):
        """ Returns the first and last product on the page """
        soup = BeautifulSoup(html, features='html.parser')

        products = soup.findAll("a", {"class": "product"})

        assert len(products) > 0
        first = products[0]
        last = products[-1]

        return (first, last)