# -*- coding: utf-8 -*-

import os
import base64
import asyncio
import tempfile
from http import HTTPStatus
from dashscope.audio.asr import Recognition
from digitalHuman.utils import logger
from digitalHuman.engine.builder import ASREngines
from digitalHuman.protocol import AudioMessage, TextMessage, AUDIO_TYPE, DATA_TYPE
from digitalHuman.engine.engineBase import BaseASREngine

__all__ = ["DashscopeASR"]


@ASREngines.register("dashscopeASR")
class DashscopeASR(BaseASREngine):
    def setup(self):
        """初始化配置"""
        try:
            import dashscope
            # 从配置或环境变量获取 API Key
            custom_config = self.custom()
            api_key = custom_config.get('api_key') or os.getenv('DASHSCOPE_API_KEY')
            if api_key:
                dashscope.api_key = api_key
                logger.info("[DashscopeASR] API Key configured successfully")
            else:
                logger.warning("[DashscopeASR] No API Key found, please set DASHSCOPE_API_KEY environment variable or configure in yaml")
        except ImportError:
            logger.error("[DashscopeASR] Please install dashscope: pip install dashscope")
            raise
        except Exception as e:
            logger.error(f"[DashscopeASR] Setup error: {e}")
            raise

    async def run(self, input: AudioMessage, **kwargs) -> TextMessage:
        """
        执行语音识别
        input: AudioMessage，包含音频数据
        返回: TextMessage，包含识别文本
        """
        # 参数校验
        paramters = self.checkParameter(**kwargs)
        model = paramters.get("model", "fun-asr-realtime")
        sample_rate = paramters.get("sample_rate", 16000)
        format_type = paramters.get("format", "wav")
        language_hints = paramters.get("language_hints", ["zh", "en"])
        
        try:
            # 处理音频数据
            audio_data = input.data
            if isinstance(audio_data, str):
                # 如果是base64编码的字符串，先解码
                audio_data = base64.b64decode(audio_data)
            
            # 保存为临时文件
            file_suffix = f'.{input.type}' if hasattr(input, 'type') else '.wav'
            with tempfile.NamedTemporaryFile(delete=False, suffix=file_suffix) as tmp_file:
                tmp_file.write(audio_data)
                audio_path = tmp_file.name
            
            logger.debug(f"[DashscopeASR] Using model: {model}, format: {format_type}, sample_rate: {sample_rate}")
            
            # 创建识别对象
            # 注意：language_hints 只支持 paraformer-realtime-v2 模型
            if model in ['paraformer-realtime-v2', 'paraformer-v2']:
                recognition = Recognition(
                    model=model,
                    format=format_type,
                    sample_rate=sample_rate,
                    language_hints=language_hints,
                    callback=None
                )
            else:
                # fun-asr-realtime 等模型不支持 language_hints
                recognition = Recognition(
                    model=model,
                    format=format_type,
                    sample_rate=sample_rate,
                    callback=None
                )
            
            # 执行识别（在线程池中执行同步调用）
            logger.debug(f"[DashscopeASR] Starting recognition for audio file: {audio_path}")
            result = await asyncio.get_event_loop().run_in_executor(
                None, recognition.call, audio_path
            )
            
            # 清理临时文件
            try:
                os.remove(audio_path)
            except Exception as e:
                logger.warning(f"[DashscopeASR] Failed to remove temp file: {e}")
            
            # 处理结果
            if result.status_code == HTTPStatus.OK:
                # 获取识别结果
                sentence = result.get_sentence()
                logger.debug(f"[DashscopeASR] Sentence type: {type(sentence)}, content: {sentence}")
                
                # 从句子对象中提取文本
                if isinstance(sentence, dict):
                    # 字典类型，提取text字段
                    text = sentence.get('text', '')
                elif isinstance(sentence, list) and len(sentence) > 0:
                    # 如果是列表，获取第一个元素
                    first_item = sentence[0]
                    text = first_item.get('text', '') if isinstance(first_item, dict) else str(first_item)
                elif isinstance(sentence, str):
                    text = sentence
                else:
                    # 尝试获取所有可用的文本字段
                    text = str(sentence) if sentence else ''
                
                logger.info(f"[DashscopeASR] Recognition result: {text}")
                logger.debug(
                    f"[Metric] requestId: {recognition.get_last_request_id()}, "
                    f"first package delay ms: {recognition.get_first_package_delay()}, "
                    f"last package delay ms: {recognition.get_last_package_delay()}"
                )
                return TextMessage(data=text)
            else:
                error_msg = f"Recognition failed: {result.message}"
                logger.error(f"[DashscopeASR] {error_msg}")
                raise RuntimeError(error_msg)
                
        except Exception as e:
            logger.error(f"[DashscopeASR] Error during recognition: {e}")
            raise