"""
Module: lexoffice.py
Description: Provides an interface to interact with the Lexoffice API.
This module enables operations such as retrieving invoice details from Lexoffice,
making it easier to integrate Lexoffice API functionality into a Flask application.
"""

from pathlib import Path
import yaml
import requests
import logging


class LexofficeAPI:
    """Class to handle interactions with the Lexoffice API."""

    def __init__(self):
        """Initialize with the Lexoffice API access token from a config file."""
        self.base_url = "https://api.lexoffice.io/v1"
        self.headers = {
            "Authorization": f"Bearer {self._load_api_token()}",
            "Content-Type": "application/json",
            "Accept": "application/json"
        }

    @staticmethod
    def _load_api_token() -> str:
        """Load the API token from the config.yaml file."""
        config_path = Path(__file__).parent.parent / 'config.yaml'
        with config_path.open('r') as file:
            config = yaml.safe_load(file)
        return config['lexoffice']['api_token']

    def get_invoice_total_gross_amount(self, invoice_id: str) -> float:
        """
        Retrieve the total gross amount for a specific invoice.

        Args:
            invoice_id (str): Unique identifier of the invoice.

        Returns:
            float or None: Total gross amount of the invoice, or None if an error occurs.
        """
        url = f"{self.base_url}/invoices/{invoice_id}"

        try:
            response = requests.get(url, headers=self.headers)
            response.raise_for_status()
            return response.json().get('totalPrice', {}).get('totalGrossAmount')

        except requests.exceptions.RequestException as e:
            logging.error(f"Error fetching invoice: {e}")
            return None

# Usage example:
# lexoffice_api = LexofficeAPI()
# total_gross_amount = lexoffice_api.get_invoice_total_gross_amount('your_invoice_id')
# print(total_gross_amount)