import os
import logging
import dotenv
import pprint
from influxdb import InfluxDBClient
from dataclasses import dataclass

logger = logging.getLogger(__file__)

MISSING_DB_PW = """
Password for the InfluxDB write_user was not set.
See https://docs.gitlab.com/ee/ci/variables/#secret-variables
"""


def load_config_from_env(env_path: str = ".env"):
    if os.path.exists(env_path):
        dotenv.load_dotenv(env_path)
    return DBConfig(
        host=os.environ["INFLUXDB_HOST"],
        port=os.environ["INFLUXDB_PORT"],
        user_name=os.environ["INFLUXDB_USER_NAME"],
        database=os.environ["INFLUXDB_DATABASE"],
        write_user_pw=os.environ["INFLUXDB_WRITE_USER_PASSWORD"]
    )


@dataclass
class DBConfig:
    """
    Configclass that stores the information for accessing the Database.
    """
    host: str
    port: int
    user_name: str
    database: str
    write_user_pw: str


class Uploader:
    def __init__(self, config: DBConfig = load_config_from_env()):
        self.config = config

        self.client = InfluxDBClient(
            host=config.host,
            port=config.port,
            username=config.user_name,
            password=config.write_user_pw,
            database=config.database,
        )

    def upload(self, points, dry_run=False, *args, **kwargs):
        logger.info(f"Uploading: {pprint.pformat(points)}")
        if not dry_run:
            success = self.client.write_points(points,
                                               *args,
                                               **kwargs)
            if success:
                logger.info(f"Uploaded {len(points)} items")
            else:
                raise ValueError("Uploading to influxdb went wrong!")