import re
import subprocess
from datetime import datetime


def test_last_review_date():
    statement_file_path = "app/templates/views/accessibility_statement.html"

    # test local changes against master for a full diff of what will be merged
    statement_diff = subprocess.run([f"git diff --exit-code origin/master -- {statement_file_path}"],
                                    stdout=subprocess.PIPE, shell=True)

    # if statement has changed, test the review date was part of those changes
    if statement_diff.returncode == 1:
        raw_diff = statement_diff.stdout.decode('utf-8')
        today = datetime.now().strftime('%d %B %Y')
        with open(statement_file_path, 'r') as statement_file:
            current_review_date = re.search((r'"Last updated": "(\d{1,2} [A-Z]{1}[a-z]+ \d{4})"'),
                                            statement_file.read()).group(1)

        # guard against changes that don't need to update the review date
        if current_review_date != today:
            assert '"Last updated": "' in raw_diff