import os
os.system("sudo apt-get install xclip")
import nltk
from fastapi import FastAPI, File, Request, UploadFile, Body, Depends, HTTPException
from fastapi.security.api_key import APIKeyHeader
from typing import Optional, Annotated
from fastapi.encoders import jsonable_encoder
from PIL import Image
from io import BytesIO
import pytesseract
from nltk.tokenize import sent_tokenize
from transformers import MarianMTModel, MarianTokenizer
nltk.download('punkt')

API_KEY = os.environ.get("API_KEY")

app = FastAPI()
api_key_header = APIKeyHeader(name="api_key", auto_error=False)

def get_api_key(api_key: Optional[str] = Depends(api_key_header)):
    if api_key is None or api_key != API_KEY:
        raise HTTPException(status_code=401, detail="Unauthorized access")
    return api_key

# Image path
img_dir = "./data"
# Get tesseract language list
choices = os.popen('tesseract --list-langs').read().split('\n')[1:-1]
# Convert tesseract language list to pytesseract language
def ocr_lang(lang_list):
    lang_str = ""
    lang_len = len(lang_list)
    if lang_len == 1:
        return lang_list[0]
    else:
        for i in range(lang_len):
            lang_list.insert(lang_len - i, "+")

        lang_str = "".join(lang_list[:-1])
        return lang_str
# ocr tesseract
def ocr_tesseract(img, languages):
    print("[img]", img)
    print("[languages]", languages)
    ocr_str = pytesseract.image_to_string(img, lang=ocr_lang(languages))
    return ocr_str

@app.post("/api/ocr", response_model=dict)
async def ocr(
    api_key: str = Depends(get_api_key),
    image: UploadFile = File(...),
    # languages: list = Body(["eng"])
):
    
    try:
        content = await image.read()
        image = Image.open(BytesIO(content))
        print("[image]",image)
        if hasattr(pytesseract, "image_to_string"):
            print("Image to string function is available")
            # print(pytesseract.image_to_string(image, lang = 'eng'))
            text = ocr_tesseract(image, ['eng'])
        else:
            print("Image to string function is not available")
        # text = pytesseract.image_to_string(image, lang="+".join(languages))
    except Exception as e:
        return {"error": str(e)}, 500

    return {"ImageText": "text"}

@app.post("/api/translate", response_model=dict)
async def translate(
    api_key: str = Depends(get_api_key),
    text: str = Body(...),
    src: str = "en",
    trg: str = "zh",
):
    if api_key != API_KEY:
        return {"error": "Invalid API key"}, 401

    tokenizer, model = get_model(src, trg)

    translated_text = ""
    for sentence in sent_tokenize(text):
        translated_sub = model.generate(**tokenizer(sentence, return_tensors="pt"))[0]
        translated_text += tokenizer.decode(translated_sub, skip_special_tokens=True) + "\n"

    return jsonable_encoder({"translated_text": translated_text})

def get_model(src: str, trg: str):
    model_name = f"Helsinki-NLP/opus-mt-{src}-{trg}"
    tokenizer = MarianTokenizer.from_pretrained(model_name)
    model = MarianMTModel.from_pretrained(model_name)
    return tokenizer, model