import logging
import os
import tempfile
import uuid
from datetime import datetime

from fastapi import APIRouter, Request, File, UploadFile
from fastapi.responses import JSONResponse

# 创建路由路由器
router = APIRouter(prefix="/api", tags=["学伴"])

# 配置日志
logger = logging.getLogger(__name__)

# 导入学伴工具函数、ASR客户端和OBS上传工具
from Util.XueBanUtil import get_xueban_response_async
from Util.ASRClient import ASRClient
from Util.ObsUtil import ObsUploader


@router.post("/xueban/upload-audio")
async def upload_audio(file: UploadFile = File(...)):
    """
    上传音频文件并进行ASR处理
    - 参数: file - 音频文件
    - 返回: JSON包含识别结果
    """
    try:
        # 记录日志
        logger.info(f"接收到音频文件: {file.filename}")

        # 保存临时文件
        timestamp = datetime.now().strftime("%Y%m%d%H%M%S")
        file_ext = os.path.splitext(file.filename)[1]
        temp_file_name = f"temp_audio_{timestamp}{file_ext}"
        temp_file_path = os.path.join(tempfile.gettempdir(), temp_file_name)

        with open(temp_file_path, "wb") as f:
            content = await file.read()
            f.write(content)

        logger.info(f"音频文件已保存至临时目录: {temp_file_path}")

        # 调用ASR服务进行处理
        asr_result = await process_asr(temp_file_path)

        # 删除临时文件
        os.remove(temp_file_path)
        logger.info(f"临时文件已删除: {temp_file_path}")

        # 返回识别结果
        return JSONResponse(content={
            "success": True,
            "message": "音频识别成功",
            "data": asr_result
        })

    except Exception as e:
        logger.error(f"音频处理失败: {str(e)}")
        return JSONResponse(content={
            "success": False,
            "message": f"音频处理失败: {str(e)}"
        }, status_code=500)


async def process_asr(audio_path: str) -> dict:
    """
    调用ASR服务处理音频文件
    :param audio_path: 音频文件路径
    :return: 识别结果字典
    """
    try:
        # 上传文件到华为云OBS
        audio_url = upload_file_to_obs(audio_path)
        
        # 创建ASR客户端实例
        asr_client = ASRClient()
        
        # 设置音频文件URL
        asr_client.file_url = audio_url
        
        # 处理ASR任务并获取文本结果
        text_result = asr_client.process_task()
        
        # 构建返回结果
        return {
            "text": text_result,
            "confidence": 1.0,  # 实际应用中，这里应该从ASR结果中获取置信度
            "audio_duration": os.path.getsize(audio_path) / 1024 / 16  # 估算音频时长
        }
    except Exception as e:
        logger.error(f"ASR处理失败: {str(e)}")
        raise


def upload_file_to_obs(file_path: str) -> str:
    """
    将本地文件上传到华为云OBS并返回URL
    :param file_path: 本地文件路径
    :return: OBS上的文件URL
    """
    try:
        # 创建OBS上传器实例
        obs_uploader = ObsUploader()
        
        # 生成UUID文件名
        file_uuid = str(uuid.uuid4())
        file_ext = os.path.splitext(file_path)[1].lower()
        # 确保文件扩展名为.wav
        if file_ext != '.wav':
            file_ext = '.wav'
        
        # 构建对象键（前缀 + UUID + .wav）
        object_key = f"HuangHai/XueBan/{file_uuid}{file_ext}"
        
        # 上传文件
        success, result = obs_uploader.upload_file(object_key, file_path)
        
        if success:
            logger.info(f"文件上传成功: {file_path} -> {object_key}")
            # 构建文件URL（假设OBS桶是公开可读的）
            # 实际应用中，URL格式可能需要根据华为云OBS的具体配置进行调整
            from Config.Config import OBS_SERVER, OBS_BUCKET
            file_url = f"https://{OBS_BUCKET}.{OBS_SERVER}/{object_key}"
            return file_url
        else:
            error_msg = f"文件上传失败: {result}"
            logger.error(error_msg)
            raise Exception(error_msg)
    except Exception as e:
        logger.error(f"上传文件到OBS失败: {str(e)}")
        raise


@router.post("/xueban/chat")
async def chat_with_xueban(request: Request):
    """
    与学伴大模型聊天的接口
    - 参数: request body 中的 query_text (用户查询文本)
    - 返回: JSON包含聊天响应
    """
    try:
        # 获取请求体数据
        data = await request.json()
        query_text = data.get("query_text", "")

        if not query_text.strip():
            return JSONResponse(content={
                "success": False,
                "message": "查询文本不能为空"
            }, status_code=400)

        # 记录日志
        logger.info(f"接收到学伴聊天请求: {query_text}")

        # 调用异步接口获取学伴响应
        response_content = []
        async for chunk in get_xueban_response_async(query_text, stream=True):
            response_content.append(chunk)

        full_response = "".join(response_content)

        # 返回响应
        return JSONResponse(content={
            "success": True,
            "message": "聊天成功",
            "data": {
                "response": full_response
            }
        })

    except Exception as e:
        logger.error(f"学伴聊天失败: {str(e)}")
        return JSONResponse(content={
            "success": False,
            "message": f"聊天处理失败: {str(e)}"
        }, status_code=500)