"""In-app notification inbox API."""

from __future__ import annotations

import logging
from typing import Any

from fastapi import APIRouter, Depends, HTTPException, Query, Request
from pydantic import BaseModel, Field

from app.gateway.deps import get_notification_store
from deerflow.persistence.notifications import NotificationStore
from deerflow.runtime.user_context import get_effective_user_id

logger = logging.getLogger(__name__)

router = APIRouter(prefix="/api", tags=["notifications"])


def _current_user_id(request: Request) -> str:
    user = getattr(request.state, "user", None)
    if user is not None:
        return str(user.id)
    return get_effective_user_id()


class NotificationItem(BaseModel):
    id: str
    user_id: str
    type: str
    title: str
    body: str
    payload: dict[str, Any]
    read: bool
    created_at: str | None


class NotificationListResponse(BaseModel):
    items: list[NotificationItem]


class NotificationUnreadCountResponse(BaseModel):
    unread: int = Field(..., description="Number of unread notifications for the current user")


class MarkReadResponse(BaseModel):
    success: bool


class MarkAllReadResponse(BaseModel):
    updated: int


@router.get(
    "/notifications",
    response_model=NotificationListResponse,
    summary="List Notifications",
)
async def list_notifications(
    request: Request,
    unread_only: bool = Query(default=False),
    limit: int = Query(default=50, ge=1, le=200),
    store: NotificationStore = Depends(get_notification_store),
) -> NotificationListResponse:
    try:
        items = await store.list_for_user(
            _current_user_id(request),
            unread_only=unread_only,
            limit=limit,
        )
        return NotificationListResponse(items=[NotificationItem(**item) for item in items])
    except Exception as e:
        logger.error("Failed to list notifications: %s", e, exc_info=True)
        raise HTTPException(status_code=500, detail=f"Failed to list notifications: {e}")


@router.get(
    "/notifications/unread_count",
    response_model=NotificationUnreadCountResponse,
    summary="Unread Notification Count",
)
async def unread_count(
    request: Request,
    store: NotificationStore = Depends(get_notification_store),
) -> NotificationUnreadCountResponse:
    try:
        count = await store.unread_count(_current_user_id(request))
        return NotificationUnreadCountResponse(unread=count)
    except Exception as e:
        logger.error("Failed to read unread notification count: %s", e, exc_info=True)
        raise HTTPException(status_code=500, detail=f"Failed to read unread count: {e}")


@router.post(
    "/notifications/{notification_id}/read",
    response_model=MarkReadResponse,
    summary="Mark Notification Read",
)
async def mark_read(
    notification_id: str,
    request: Request,
    store: NotificationStore = Depends(get_notification_store),
) -> MarkReadResponse:
    try:
        ok = await store.mark_read(notification_id, _current_user_id(request))
        if not ok:
            raise HTTPException(status_code=404, detail="Notification not found")
        return MarkReadResponse(success=True)
    except HTTPException:
        raise
    except Exception as e:
        logger.error("Failed to mark notification read: %s", e, exc_info=True)
        raise HTTPException(status_code=500, detail=f"Failed to mark read: {e}")


@router.post(
    "/notifications/read_all",
    response_model=MarkAllReadResponse,
    summary="Mark All Notifications Read",
)
async def mark_all_read(
    request: Request,
    store: NotificationStore = Depends(get_notification_store),
) -> MarkAllReadResponse:
    try:
        count = await store.mark_all_read(_current_user_id(request))
        return MarkAllReadResponse(updated=count)
    except Exception as e:
        logger.error("Failed to mark all notifications read: %s", e, exc_info=True)
        raise HTTPException(status_code=500, detail=f"Failed to mark all read: {e}")


@router.delete(
    "/notifications/{notification_id}",
    response_model=MarkReadResponse,
    summary="Delete Notification",
)
async def delete_notification(
    notification_id: str,
    request: Request,
    store: NotificationStore = Depends(get_notification_store),
) -> MarkReadResponse:
    try:
        ok = await store.delete(notification_id, _current_user_id(request))
        if not ok:
            raise HTTPException(status_code=404, detail="Notification not found")
        return MarkReadResponse(success=True)
    except HTTPException:
        raise
    except Exception as e:
        logger.error("Failed to delete notification: %s", e, exc_info=True)
        raise HTTPException(status_code=500, detail=f"Failed to delete: {e}")