from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.orm import Session
from typing import List
from app.db.base import get_db
from app.models.user import User
from app.models.notification import Notification, NotificationSettings
from app.schemas.notification import (
    NotificationResponse,
    NotificationSettingsResponse,
    NotificationSettingsUpdate,
)
from app.api.auth import get_current_user
from app.services.notification_service import NotificationService

router = APIRouter()


@router.get("/", response_model=List[NotificationResponse])
def get_notifications(
    skip: int = 0,
    limit: int = 50,
    unread_only: bool = False,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Get user's notifications"""
    query = db.query(Notification).filter(Notification.recipient_id == current_user.id)

    if unread_only:
        query = query.filter(Notification.is_read is False)

    notifications = (
        query.order_by(Notification.created_at.desc()).offset(skip).limit(limit).all()
    )

    # Add sender names
    for notification in notifications:
        if notification.sender:
            notification.sender_name = (
                f"{notification.sender.first_name} {notification.sender.last_name}"
            )

    return notifications


@router.get("/unread-count")
def get_unread_count(
    db: Session = Depends(get_db), current_user: User = Depends(get_current_user)
):
    """Get count of unread notifications"""
    count = NotificationService.get_unread_count(db, current_user.id)
    return {"unread_count": count}


@router.put("/{notification_id}/read")
def mark_notification_read(
    notification_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Mark a notification as read"""
    success = NotificationService.mark_as_read(db, notification_id, current_user.id)
    if not success:
        raise HTTPException(status_code=404, detail="Notification not found")
    return {"message": "Notification marked as read"}


@router.put("/mark-all-read")
def mark_all_notifications_read(
    db: Session = Depends(get_db), current_user: User = Depends(get_current_user)
):
    """Mark all notifications as read"""
    count = NotificationService.mark_all_as_read(db, current_user.id)
    return {"message": f"Marked {count} notifications as read"}


@router.delete("/{notification_id}")
def delete_notification(
    notification_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Delete a notification"""
    notification = (
        db.query(Notification)
        .filter(
            Notification.id == notification_id,
            Notification.recipient_id == current_user.id,
        )
        .first()
    )

    if not notification:
        raise HTTPException(status_code=404, detail="Notification not found")

    db.delete(notification)
    db.commit()
    return {"message": "Notification deleted"}


@router.get("/settings", response_model=NotificationSettingsResponse)
def get_notification_settings(
    db: Session = Depends(get_db), current_user: User = Depends(get_current_user)
):
    """Get user's notification settings"""
    settings = (
        db.query(NotificationSettings)
        .filter(NotificationSettings.user_id == current_user.id)
        .first()
    )

    if not settings:
        # Create default settings
        settings = NotificationSettings(user_id=current_user.id)
        db.add(settings)
        db.commit()
        db.refresh(settings)

    return settings


@router.put("/settings", response_model=NotificationSettingsResponse)
def update_notification_settings(
    settings_update: NotificationSettingsUpdate,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Update user's notification settings"""
    settings = (
        db.query(NotificationSettings)
        .filter(NotificationSettings.user_id == current_user.id)
        .first()
    )

    if not settings:
        settings = NotificationSettings(user_id=current_user.id)
        db.add(settings)
        db.commit()
        db.refresh(settings)

    # Update settings
    for field, value in settings_update.dict(exclude_unset=True).items():
        setattr(settings, field, value)

    db.commit()
    db.refresh(settings)
    return settings