from fastapi import APIRouter, File, UploadFile, Form
from typing import Optional
from PIL import Image
import urllib.request
from io import BytesIO
import utils
import os
import json
from config import Settings
from routers.donut_inference import process_document_donut

router = APIRouter()

def count_values(obj):
    if isinstance(obj, dict):
        return sum(count_values(v) for v in obj.values())
    elif isinstance(obj, list):
        return sum(count_values(i) for i in obj)
    else:
        return 1

@router.post("/inference")
async def run_inference(
    file: Optional[UploadFile] = File(None),
    image_url: Optional[str] = Form(None),
    model_in_use: str = Form('donut'),
    shipper_id: str = Form(...)
):
    # Dynamically load config based on shipper ID
    settings = Settings(shipper_id=shipper_id)

    result = []
    processing_time = 0

    if file:
        if file.content_type not in ["image/jpeg", "image/jpg"]:
            return {"error": "Invalid file type. Only JPG images are allowed."}

        image = Image.open(BytesIO(await file.read()))
        if model_in_use == 'donut':
            result, processing_time = process_document_donut(image, settings)
        utils.log_stats(settings.inference_stats_file, [processing_time, count_values(result), file.filename, settings.model])
    elif image_url:
        with urllib.request.urlopen(image_url) as url:
            image = Image.open(BytesIO(url.read()))
        if model_in_use == 'donut':
            result, processing_time = process_document_donut(image, settings)
        file_name = image_url.split("/")[-1]
        utils.log_stats(settings.inference_stats_file, [processing_time, count_values(result), file_name, settings.model])
    else:
        result = {"info": "No input provided"}

    return {
        "shipper_id": shipper_id,
        "model": settings.model,
        "processor": settings.processor,
        "result": result
    }

@router.get("/statistics")
async def get_statistics():
    file_path = settings.inference_stats_file

    # Check if the file exists, and read its content
    if os.path.exists(file_path):
        with open(file_path, 'r') as file:
            try:
                content = json.load(file)
            except json.JSONDecodeError:
                content = []
    else:
        content = []

    return content