import os
import time
from datetime import datetime, timezone, timedelta

from influxdb_client_3 import InfluxDBClient3, Point, WriteOptions, write_client_options
import dateutil.parser
from dateutil import tz
import pandas as pd
import requests
import queue
import threading




def parseDate(date_string: str):
	# 默认UTC时间转中国时间
	return dateutil.parser.parse(date_string).astimezone(tz.gettz('ETC/GMT-8'))


class HistoryDBManage:
    def __init__(self, database='dcs', table='history', host="http://localhost:8181", token="", org="dcs"):
        token = self.getAPIToken() if not token else token
        self.database = database
        self.table = table
        self.host = host
        self.token = token
        self.org = org

        # 写入回调
        def onSuccess(conf, data, exception=None):
            now_ms = datetime.now(timezone(timedelta(hours=8)))
            # 统一转为字符串
            if isinstance(data, bytes):
                data = data.decode(errors="ignore")
            elif not isinstance(data, str):
                data = str(data)
            for line in data.split('\n'):
                # print(line)
                # m = re.search(r'enqueue_time_ms=([0-9]+)', line)
                m = line.split(' ')[-1][:-3]
                if m:
                    enqueue_time_ms = int(m)
                    # 转为datetime对象
                    # print(enqueue_time_ms / 1000)
                    enqueue_time_dt = datetime.fromtimestamp(enqueue_time_ms /1000000, tz=timezone(timedelta(hours=8)))
                    # delay = now_ms - enqueue_time_ms
                    print(f"写入延迟: {1} ms (enqueue_time={enqueue_time_dt}, now={now_ms})")
        def onError(conf, data, exception=None):
            print("InfluxDB写入失败")
        def onRetry(conf, data, exception=None):
            print("InfluxDB写入重试")

        # 官方推荐批量写入配置
        self.client = InfluxDBClient3(
            host=host,
            token=token,
            org=org,
            database=database,
            write_client_options=write_client_options(
                write_options=WriteOptions(batch_size=5000, flush_interval=2000),  # flush_interval单位ms
                # success_callback=onSuccess,
                error_callback=onError,
                retry_callback=onRetry
            )
        )

        self.writeQueue = queue.Queue()
        self._stopWriteThread = threading.Event()
        self.writeThread = threading.Thread(target=self._writeWorker, daemon=True)
        self.writeThread.start()
    
    @classmethod
    def getAPIToken(cls):
        try:
            with open('Static/InfluxDB.api', 'r', encoding='utf-8') as f:
                token = f.read()
        except Exception as e:
            print(f"读取token文件失败: {e}")
            token = ""
        return token

    def createDatabaseIfNotExists(self):
        try:
            sql = f'SELECT 1 FROM "{self.table}" LIMIT 1'
            self.client.query(sql)
        except Exception:
            pass

    def writeVarValue(self, varName, value):
        # 入队时记录中国时区时间
        enqueue_time = datetime.now()
        self.writeQueue.put((varName, value, enqueue_time))

    def _writeWorker(self):
        while not self._stopWriteThread.is_set():
            try:
                varName, value, enqueue_time = self.writeQueue.get()
                # print(self.writeQueue.qsize())
            except queue.Empty:
                # print(1111)
                continue
            # 用Point对象构建数据点，时间用入队时间
            point = Point(self.table).tag("varName", varName).field("value", float(value)).time(enqueue_time)
            self.client.write(point)

    def queryVarHistory(self, varName, startTime=None, endTime=None):
        where = f'"varName" = \'{varName}\''
        if startTime:
            where += f" AND time >= '{startTime}'"
        if endTime:
            where += f" AND time <= '{endTime}'"
        # 关键：用tz()函数将time字段转为中国时区
        sql = f'SELECT tz(time, \'Asia/Shanghai\') AS time, value FROM "{self.table}" WHERE {where} ORDER BY time ASC LIMIT 100000'
        # print(f"执行SQL查询: {sql}")
        try:
            df = self.client.query(sql, mode="pandas")
            import pandas as pd
            if isinstance(df, pd.DataFrame):
                data = df["value"].tolist() if "value" in df.columns else []
                timeList = df["time"].tolist() if "time" in df.columns else []
                print(f"查询到 {len(data)} 个数据点")
            else:
                # print(f"查询结果不是DataFrame: {type(df)}")
                data, timeList = [], []
        except Exception as e:
            print(f"查询结果处理失败: {e}")
            data, timeList = [], []
        return data, timeList

    def getAllVarNames(self):
        """获取所有去重后的变量名列表"""
        sql = f'SELECT DISTINCT("varName") FROM "{self.table}"'
        try:
            df = self.client.query(sql, mode="pandas")
            import pandas as pd
            if isinstance(df, pd.DataFrame) and 'varName' in df.columns:
                return df['varName'].tolist()
            else:
                return []
        except Exception as e:
            print(f"获取变量名失败: {e}")
            return []

    @classmethod
    def deleteTable(cls, table):
        token = cls.getAPIToken()
        host = 'http://localhost:8181'
        import datetime
        # 获取当前UTC时间+1分钟，去除微秒，Z结尾
        now = datetime.datetime.utcnow().replace(tzinfo=datetime.timezone.utc, microsecond=0)
        hardDeleteAt = (now + datetime.timedelta(minutes=1)).isoformat().replace('+00:00', 'Z')
        url = f"{host.rstrip('/')}/api/v3/configure/table?db={'dcs'}&table={table}&hard_delete_at={hardDeleteAt}"
        headers = {
            'Authorization': f'Bearer {token}'
        }
        response = requests.delete(url, headers=headers)
        print(hardDeleteAt)
        if response.status_code != 200:
            print(f"删除失败: {response.status_code} {response.text}")
        else:
            print(f"已硬删除表 {table} 的所有历史数据。")

    def stopWriteThread(self):
        self._stopWriteThread.set()
        self.writeThread.join(timeout=1)

    def close(self):
        self.stopWriteThread()
        self.client.close()

if __name__ == '__main__':
    db = HistoryDBManage(
        database="dcs",
        table="p1",
        host="http://localhost:8181",
        token="apiv3_ynlNTgq_OX164srSzjYXetWZJGOpgokFJbp_JaToWYlzwIPAZboPxKt4ss6vD1_4jj90QOIDnRDodQSJ66m3_g",
        org="dcs"
    )
    data, times = db.queryVarHistory("有源/无源4-20mA输入通道1")
    print(data, times)
    db.close()