import os
import apprise
from fastapi import FastAPI, Request, HTTPException
from pydantic import BaseModel, Field, field_validator
from typing import List, Union 

# --- Models for Request Body ---
class Notification(BaseModel):
    urls: Union[List[str], str] = Field(..., description="A single Apprise URL or a list of them.")
    body: str = Field(..., description="The main content of the notification.")
    title: str = Field(None, description="The optional title of the notification.")
    tag: str = Field(None, description="An optional tag to target pre-configured URLs.")

    @field_validator('urls')
    @classmethod
    def urls_to_list(cls, v: Union[List[str], str]) -> List[str]:
        if isinstance(v, str):
            return [v]
        return v

# --- FastAPI App Initialization ---
app = FastAPI(
    title="Apprise API Wrapper",
    description="A flexible wrapper for Apprise that is Hugging Face compatible.",
)

# --- Apprise Configuration Loading ---
CONFIG_FILE = 'apprise.yml'
apobj = apprise.Apprise()
if os.path.exists(CONFIG_FILE):
    apobj.add(f"file://{CONFIG_FILE}")

# --- API Endpoints ---
@app.get("/")
def health_check():
    """
    Health Check Endpoint.
    """
    return {"status": "ok", "message": "Apprise API is healthy."}

@app.post("/notify")
async def notify(notification: Notification):
    """
    Sends a notification using Apprise. Now accepts both string and list for 'urls'.
    """
    request_apobj = apprise.Apprise()
    
    for url in notification.urls:
        request_apobj.add(url)
    
    if notification.tag:
        if not apobj.find(notification.tag):
             raise HTTPException(
                status_code=400,
                detail=f"The specified tag '{notification.tag}' was not found in the configuration.",
            )
        request_apobj.add(apobj.find(notification.tag))

    if not request_apobj.urls():
        raise HTTPException(
            status_code=400,
            detail="No notification URLs provided in the request or matched by the tag.",
        )

    success = request_apobj.notify(
        body=notification.body,
        title=notification.title,
    )

    if not success:
        raise HTTPException(
            status_code=500,
            detail="Failed to send notification. Check server logs for details.",
        )

    return {"status": "success", "message": "Notification sent successfully."}