from typing import Optional
from dataclasses import dataclass


@dataclass
class CallMetadata:
    call_id: Optional[str] = None
    caller_number: Optional[str] = None
    callee_number: Optional[str] = None
    caller_name: Optional[str] = None
    callee_name: Optional[str] = None
    employee: Optional[str] = None
    direction: Optional[str] = None
    duration_sec: Optional[int] = None
    datetime: Optional[str] = None
    audio_url: Optional[str] = None
    audio_data: Optional[bytes] = None
    audio_filename: Optional[str] = None
    source_email_id: Optional[str] = None


class BaseEmailParser:
    def parse_email(self, subject: str, body_text: str, body_html: str) -> Optional[CallMetadata]:
        raise NotImplementedError

    def parse_url(self, url: str) -> Optional[CallMetadata]:
        raise NotImplementedError

    def extract_audio_url(self, body_text: str, body_html: str) -> Optional[str]:
        raise NotImplementedError