import ast
import base64
import hashlib
import hmac
import json
import time
import requests
import urllib
import os
from audio_process import get_audio_duration
from config import set_config
from log import Log

config_ = set_config()
log_ = Log()


class RequestApi(object):
    def __init__(self, appid, secret_key, upload_file_path):
        self.appid = appid
        self.secret_key = secret_key
        self.upload_file_path = upload_file_path
        self.ts = str(int(time.time()))
        self.signa = self.get_signa()

    def get_signa(self):
        """
        signa生成
        :return: signa
        """
        # signa的生成公式：HmacSHA1(MD5(appid + ts)，secretkey)
        m2 = hashlib.md5()
        m2.update((self.appid + self.ts).encode('utf-8'))
        md5 = m2.hexdigest()
        md5 = bytes(md5, encoding='utf-8')
        # 以secret_key为key, 上面的md5为msg， 使用hashlib.sha1加密结果为signa
        signa = hmac.new(self.secret_key.encode('utf-8'), md5, hashlib.sha1).digest()
        signa = base64.b64encode(signa)
        signa = str(signa, 'utf-8')
        return signa

    def upload(self):
        """
        上传
        :return: orderId
        """
        video_id = self.upload_file_path.split('/')[-1].replace('.wav', '')
        # 获取音频文件大小，不超过500M
        file_len = os.path.getsize(self.upload_file_path)
        file_size = file_len / 1024 / 1024
        if file_size > 500:
            log_.error({'videoId': video_id, 'errorType': 'audioSizeError',
                        'errorMsg': f'audioSize: {file_size}M, required <= 500M'})
            return None
        file_name = os.path.basename(self.upload_file_path)
        # 获取音频时长，不超过5h
        duration = get_audio_duration(self.upload_file_path)
        audio_duration = duration / 1000 / 60 / 60
        if audio_duration > 5:
            log_.error({'videoId': video_id, 'errorType': 'audioDurationError',
                        'errorMsg': f'audioSize: {audio_duration}h, required <= 5h'})
            return None
        # 请求参数拼接
        param_dict = {
            'appId': self.appid,
            'signa': self.signa,
            'ts': self.ts,
            'fileSize': file_len,
            'fileName': file_name,
            'duration': str(duration),
            'roleType': 1
        }
        # print("upload参数：", param_dict)
        # 以二进制方式读取音频文件内容
        data = open(self.upload_file_path, 'rb').read(file_len)
        # 请求upload api
        response = requests.post(
            url=config_.XFASR_HOST + config_.XF_API['upload'] + "?" + urllib.parse.urlencode(param_dict),
            headers={"Content-type": "application/json"},
            data=data
        )
        # print(response.text)
        # print("upload_url:", response.request.url)
        result = json.loads(response.text)
        # print("upload resp:", result)
        return result['content']['orderId']

    def get_result(self, order_id):
        """
        查询结果
        :param order_id:
        :return: result
        """
        param_dict = {
            'appId': self.appid,
            'signa': self.signa,
            'ts': self.ts,
            'orderId': order_id,
            'resultType': 'transfer'
        }
        status = 3
        # 建议使用回调的方式查询结果，查询接口有请求频率限制
        while status == 3:
            response = requests.post(
                url=config_.XFASR_HOST + config_.XF_API['get_result'] + "?" + urllib.parse.urlencode(param_dict),
                headers={"Content-type": "application/json"}
            )
            # print("get_result_url:",response.request.url)
            result = json.loads(response.text)
            status = result['content']['orderInfo']['status']
            if status == 4:
                return result
            time.sleep(5)

    def parse_lattice(self, result):
        content = result['content']['orderResult']
        content = ast.literal_eval(content)
        contents = content['lattice']
        asr_ret = ''
        for js in contents:
            json_1best = js['json_1best']
            json_1best = ast.literal_eval(json_1best)
            # print(json_1best)
            json_1best_contents = json_1best['st']['rt']
            l = []
            for cw in json_1best_contents:
                cws = cw['ws']
                for cw in cws:
                    l.append(cw['cw'][0]['w'])
            asr_ret += ''.join(l)+'\n'
        return asr_ret


def call_asr(audio_path):
    """ASR"""
    dialogue_path = audio_path.replace('.wav', '.txt')
    # 视频已识别，则不重复调用，直接读取文件中的内容
    if os.path.exists(dialogue_path):
        with open(dialogue_path, 'r') as rf:
            asr_res = ''.join(rf.readlines())
    else:
        api = RequestApi(appid=config_.XFASR_CONFIG['appid'],
                         secret_key=config_.XFASR_CONFIG['secret_key'],
                         upload_file_path=audio_path)
        order_id = api.upload()
        result = api.get_result(order_id)
        asr_res = api.parse_lattice(result)
        with open(dialogue_path, 'w') as f:
            f.write(asr_res)
    return dialogue_path, asr_res


if __name__ == '__main__':
    audio_path = 'videos/1275943.wav'
    call_asr(audio_path=audio_path)