import asyncio
import logging
import os
from typing import Optional
import httpx
import json
import base64
from PIL import Image

from fastapi import APIRouter, FastAPI, Request, HTTPException
from memos.schemas import Entity, MetadataType

METADATA_FIELD_NAME = "ocr_result"
PLUGIN_NAME = "ocr"

router = APIRouter(tags=[PLUGIN_NAME], responses={404: {"description": "Not found"}})
endpoint = None
token = None
concurrency = None
semaphore = None

# Configure logger
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)


def image2base64(img_path):
    try:
        with Image.open(img_path) as img:
            img.convert("RGB")  # Check if image is not broken
        with open(img_path, "rb") as image_file:
            encoded_string = base64.b64encode(image_file.read()).decode("utf-8")
        return encoded_string
    except Exception as e:
        logger.error(f"Error processing image {img_path}: {str(e)}")
        return None


async def fetch(endpoint: str, client, image_base64, headers: Optional[dict] = None):
    async with semaphore:  # 使用信号量控制并发
        response = await client.post(
            f"{endpoint}",
            json={"image_base64": image_base64},
            timeout=60,
            headers=headers,
        )
        if response.status_code != 200:
            return None
        return response.json()


async def predict(img_path):
    image_base64 = image2base64(img_path)
    if not image_base64:
        return None

    async with httpx.AsyncClient() as client:
        headers = {"Authorization": f"Bearer {token}"} if token else {}
        return await fetch(endpoint, client, image_base64, headers)


@router.get("/")
async def read_root():
    return {"healthy": True}


@router.post("", include_in_schema=False)
@router.post("/")
async def ocr(entity: Entity, request: Request):
    if not entity.file_type_group == "image":
        return {METADATA_FIELD_NAME: "{}"}

    # Check if the metadata field already exists and has a non-empty value
    existing_metadata = entity.get_metadata_by_key(METADATA_FIELD_NAME)
    if existing_metadata and existing_metadata.value and existing_metadata.value.strip():
        logger.info(f"Skipping OCR processing for file: {entity.filepath} due to existing metadata")
        return {METADATA_FIELD_NAME: existing_metadata.value}

    # Check if the entity contains the tag "low_info"
    if any(tag.name == "low_info" for tag in entity.tags):
        logger.info(f"Skipping OCR processing for file: {entity.filepath} due to 'low_info' tag")
        return {METADATA_FIELD_NAME: "{}"}

    location_url = request.headers.get("Location")
    if not location_url:
        raise HTTPException(status_code=400, detail="Location header is missing")

    patch_url = f"{location_url}/metadata"

    ocr_result = await predict(entity.filepath)

    logger.info(ocr_result)
    if not ocr_result:
        logger.info(f"No OCR result found for file: {entity.filepath}")
        return {METADATA_FIELD_NAME: "{}"}

    # Call the URL to patch the entity's metadata
    async with httpx.AsyncClient() as client:
        response = await client.patch(
            patch_url,
            json={
                "metadata_entries": [
                    {
                        "key": METADATA_FIELD_NAME,
                        "value": json.dumps(
                            ocr_result,
                            default=lambda o: o.item() if hasattr(o, "item") else o,
                        ),
                        "source": PLUGIN_NAME,
                        "data_type": MetadataType.JSON_DATA.value,
                    }
                ]
            },
            timeout=30,
        )

    # Check if the patch request was successful
    if response.status_code != 200:
        raise HTTPException(
            status_code=response.status_code, detail="Failed to patch entity metadata"
        )

    return {
        METADATA_FIELD_NAME: json.dumps(
            ocr_result,
            default=lambda o: o.item() if hasattr(o, "item") else o,
        )
    }


def init_plugin(config):
    global endpoint, token, concurrency, semaphore
    endpoint = config.endpoint
    token = config.token
    concurrency = config.concurrency
    semaphore = asyncio.Semaphore(concurrency)

    logger.info("OCR plugin initialized")
    logger.info(f"Endpoint: {endpoint}")
    logger.info(f"Token: {token}")
    logger.info(f"Concurrency: {concurrency}")

if __name__ == "__main__":
    import uvicorn
    import argparse
    from fastapi import FastAPI

    parser = argparse.ArgumentParser(description="OCR Plugin")
    parser.add_argument(
        "--endpoint",
        type=str,
        default="http://localhost:8080",
        help="The endpoint URL for the OCR service",
    )
    parser.add_argument(
        "--token", type=str, default="", help="The token for authentication"
    )
    parser.add_argument(
        "--concurrency", type=int, default=4, help="The concurrency level"
    )
    parser.add_argument(
        "--port", type=int, default=8000, help="The port number to run the server on"
    )

    args = parser.parse_args()

    init_plugin(args)

    app = FastAPI()
    app.include_router(router)

    uvicorn.run(app, host="0.0.0.0", port=args.port)