from dataclasses import dataclass
from http.cookies import SimpleCookie


@dataclass
class RequestContext:
    gateway_session_id: str = ''
    source: str = ''

    def has_session(self):
        return bool(self.gateway_session_id)


class RequestContextParser:
    def parse(self, headers):
        normalized = {str(k).lower(): str(v).strip() for k, v in (headers or {}).items()}
        header_value = normalized.get('x-gateway-session', '')
        if header_value.startswith('GWS_'):
            return RequestContext(header_value, 'header')

        authorization = normalized.get('authorization', '')
        prefix = 'bearer '
        if authorization.lower().startswith(prefix):
            token = authorization[len(prefix):].strip()
            if token.startswith('GWS_'):
                return RequestContext(token, 'authorization')

        cookie_header = normalized.get('cookie', '')
        if cookie_header:
            cookie = SimpleCookie()
            cookie.load(cookie_header)
            morsel = cookie.get('gateway_session_id')
            if morsel and morsel.value.startswith('GWS_'):
                return RequestContext(morsel.value, 'cookie')

        return RequestContext()