"""
Connection service — shared profile resolution, Person creation, ntfy dispatch.

SHAREABLE_FIELDS is the single source of truth for which fields can be shared.
"""
import asyncio
import logging
from typing import Optional

from sqlalchemy.ext.asyncio import AsyncSession

from app.models.person import Person
from app.models.settings import Settings
from app.models.user import User
from app.services.ntfy import send_ntfy_notification

logger = logging.getLogger(__name__)

# Single source of truth — only these fields can be shared via connections
SHAREABLE_FIELDS = frozenset({
    "preferred_name", "email", "phone", "mobile",
    "birthday", "address", "company", "job_title",
})

# Maps shareable field names to their Settings model column names
_SETTINGS_FIELD_MAP = {
    "preferred_name": "preferred_name",
    "email": None,  # email comes from User model, not Settings
    "phone": "phone",
    "mobile": "mobile",
    "birthday": None,  # birthday comes from User model (date_of_birth)
    "address": "address",
    "company": "company",
    "job_title": "job_title",
}


def resolve_shared_profile(
    user: User,
    settings: Settings,
    overrides: Optional[dict] = None,
) -> dict:
    """
    Merge global sharing defaults with per-connection overrides.
    Returns {field: value} dict of fields the user is sharing.
    Only fields in SHAREABLE_FIELDS are included.
    """
    overrides = overrides or {}
    result = {}

    for field in SHAREABLE_FIELDS:
        # Determine if this field is shared: override wins, else global default
        share_key = f"share_{field}"
        global_share = getattr(settings, share_key, False)
        is_shared = overrides.get(field, global_share)

        if not is_shared:
            continue

        # Resolve the actual value
        if field == "preferred_name":
            result[field] = settings.preferred_name
        elif field == "email":
            result[field] = user.email
        elif field == "birthday":
            result[field] = str(user.date_of_birth) if user.date_of_birth else None
        elif field in _SETTINGS_FIELD_MAP and _SETTINGS_FIELD_MAP[field]:
            result[field] = getattr(settings, _SETTINGS_FIELD_MAP[field], None)

    return result


def create_person_from_connection(
    owner_user_id: int,
    connected_user: User,
    connected_settings: Settings,
    shared_profile: dict,
) -> Person:
    """Create a Person record for a new connection. Does NOT add to session — caller does."""
    # Use shared preferred_name for display, fall back to umbral_name
    first_name = shared_profile.get("preferred_name") or connected_user.umbral_name
    email = shared_profile.get("email")
    phone = shared_profile.get("phone")
    mobile = shared_profile.get("mobile")
    address = shared_profile.get("address")
    company = shared_profile.get("company")
    job_title = shared_profile.get("job_title")
    birthday_str = shared_profile.get("birthday")

    from datetime import date as date_type
    birthday = None
    if birthday_str:
        try:
            birthday = date_type.fromisoformat(birthday_str)
        except (ValueError, TypeError):
            pass

    # Compute display name
    display_name = first_name or connected_user.umbral_name

    return Person(
        user_id=owner_user_id,
        name=display_name,
        first_name=first_name,
        email=email,
        phone=phone,
        mobile=mobile,
        address=address,
        company=company,
        job_title=job_title,
        birthday=birthday,
        category="Umbral",
        linked_user_id=connected_user.id,
        is_umbral_contact=True,
    )


async def detach_umbral_contact(person: Person) -> None:
    """Convert an umbral contact back to a standard contact. Does NOT commit."""
    person.linked_user_id = None
    person.is_umbral_contact = False
    # Clear shared field values but preserve locally-entered data
    # If no first_name exists, fill from the old name
    if not person.first_name:
        person.first_name = person.name or None


async def send_connection_ntfy(
    settings: Settings,
    sender_name: str,
    event_type: str,
) -> None:
    """Send ntfy push for connection events. Non-blocking with 3s timeout."""
    if not settings.ntfy_connections_enabled:
        return

    title_map = {
        "request_received": "New Connection Request",
        "request_accepted": "Connection Accepted",
    }
    message_map = {
        "request_received": f"{sender_name} wants to connect with you on Umbra",
        "request_accepted": f"{sender_name} accepted your connection request",
    }
    tag_map = {
        "request_received": ["handshake"],
        "request_accepted": ["white_check_mark"],
    }

    title = title_map.get(event_type, "Connection Update")
    message = message_map.get(event_type, f"Connection update from {sender_name}")
    tags = tag_map.get(event_type, ["bell"])

    try:
        await asyncio.wait_for(
            send_ntfy_notification(
                settings=settings,
                title=title,
                message=message,
                tags=tags,
                priority=3,
            ),
            timeout=3.0,
        )
    except asyncio.TimeoutError:
        logger.warning("ntfy connection push timed out for user_id=%s", settings.user_id)
    except Exception:
        logger.warning("ntfy connection push failed for user_id=%s", settings.user_id)