import base64
import logging
import os
from datetime import datetime

import torch
from fastapi import FastAPI, File, Form, Request, UploadFile
from fastapi.middleware.cors import CORSMiddleware
from transformers import AutoModel, AutoTokenizer

# 配置日志
logging.basicConfig(level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s")
logger = logging.getLogger(__name__)

app = FastAPI()

# 添加CORS中间件
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# 初始化模型
model_name = "Mageia/GOT-OCR2_0"
device = "cuda" if torch.cuda.is_available() else "cpu"

tokenizer = AutoTokenizer.from_pretrained(model_name, trust_remote_code=True)
model = AutoModel.from_pretrained(model_name, trust_remote_code=True, device_map=device)
model = model.eval().to(device)


# OCR处理函数
async def ocr_process(image_path, got_mode, ocr_color="", ocr_box=""):
    try:
        if "plain" in got_mode:
            if "multi-crop" in got_mode:
                res = model.chat_crop(tokenizer, image_path, ocr_type="ocr")
            else:
                res = model.chat(tokenizer, image_path, ocr_type="ocr", ocr_box=ocr_box, ocr_color=ocr_color)
            return res
        elif "format" in got_mode:
            result_path = f"{os.path.splitext(image_path)[0]}_result.html"
            if "multi-crop" in got_mode:
                res = model.chat_crop(tokenizer, image_path, ocr_type="format", render=True, save_render_file=result_path)
            else:
                res = model.chat(tokenizer, image_path, ocr_type="format", ocr_box=ocr_box, ocr_color=ocr_color, render=True, save_render_file=result_path)

            if os.path.exists(result_path):
                with open(result_path, "r", encoding="utf-8") as f:
                    html_content = f.read()
                encoded_html = base64.b64encode(html_content.encode("utf-8")).decode("utf-8")
                return {"html_content": encoded_html}

        return {"error": "未知的OCR模式"}
    except Exception as e:
        return {"error": str(e)}


@app.post("/ocr")
async def ocr_api(request: Request, image: UploadFile = File(...), got_mode: str = Form(...), ocr_color: str = Form(""), ocr_box: str = Form("")):
    # 记录请求信息
    client_host = request.client.host
    user_agent = request.headers.get("user-agent", "Unknown")
    current_time = datetime.now().strftime("%Y-%m-%d %H:%M:%S")

    log_message = f"""
    时间: {current_time}
    IP地址: {client_host}
    User-Agent: {user_agent}
    图片名称: {image.filename}
    OCR模式: {got_mode}
    OCR颜色: {ocr_color}
    OCR边界框: {ocr_box}
    """
    logger.info(log_message)

    # 保存上传的图片
    image_path = f"temp_{image.filename}"
    with open(image_path, "wb") as buffer:
        buffer.write(await image.read())

    # 处理OCR
    result = await ocr_process(image_path, got_mode, ocr_color, ocr_box)

    # 删除临时文件
    os.remove(image_path)

    # 记录处理结果
    logger.info(f"OCR处理结果: {result}")

    return result


@app.get("/")
async def read_root(request: Request):
    client_host = request.client.host
    user_agent = request.headers.get("user-agent", "Unknown")
    current_time = datetime.now().strftime("%Y-%m-%d %H:%M:%S")

    log_message = f"""
    时间: {current_time}
    IP地址: {client_host}
    User-Agent: {user_agent}
    访问: 根路径
    """
    logger.info(log_message)

    return {
        "message": "欢迎使用OCR API",
        "user_agent": user_agent,
        "model": model_name,
        "device": device,
        "ocr_mode": [
            "plain texts OCR",
            "format texts OCR",
            "plain multi-crop OCR",
            "format multi-crop OCR",
            "plain fine-grained OCR",
            "format fine-grained OCR",
        ],
    }