from fastapi import FastAPI, File, UploadFile
from fastapi.middleware.cors import CORSMiddleware
from fastapi.middleware.gzip import GZipMiddleware
import numpy as np
from PIL import Image
from paddleocr import PaddleOCR
from doctr.io import DocumentFile
from doctr.models import ocr_predictor
import io

app = FastAPI()
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"]
)

# Initialize models once at startup
ocr_model = ocr_predictor(pretrained=True)
paddle_ocr = PaddleOCR(lang='en', use_angle_cls=True)

def ocr_with_doctr(file):
    text_output = ''
    doc = DocumentFile.from_pdf(file)
    result = ocr_model(doc)
    for page in result.pages:
        for block in page.blocks:
            for line in block.lines:
                text_output += " ".join([word.value for word in line.words]) + "\n"
    return text_output

def ocr_with_paddle(img):
    finaltext = ''
    result = paddle_ocr.ocr(img)
    for i in range(len(result[0])):
        text = result[0][i][1][0]
        finaltext += ' ' + text
    return finaltext

def generate_text_from_image(img):
    return ocr_with_paddle(img)

@app.post("/ocr/")
async def perform_ocr(file: UploadFile = File(...)):
    file_bytes = await file.read()
    if file.filename.endswith('.pdf'):
        text_output = ocr_with_doctr(io.BytesIO(file_bytes))
    else:
        img = np.array(Image.open(io.BytesIO(file_bytes)))
        text_output = generate_text_from_image(img)
    return {"ocr_text": text_output}

@app.get("/test/")
async def test_call():
    return {"message": "Hi. I'm running"}