EPSILON = 1e-7

COL_TIMESTAMP = 'timestamp'
COL_DATE = 'date'
COL_VALUE = 'value'

NAB_TIMESTAMP_FORMAT = '%Y-%m-%d %H:%M:%S'
ITSI_TIMESTAMP_FORMAT = '%Y-%m-%dT%H:%M:%S.000%z'
ITSI_TIMESTAMP_FORMAT_PD = '%Y-%m-%d %H:%M:%S%z'

# The default value of the threshold on the test statistic for window method of level drift detection 
LEVEL_DRIFT_THRESHOLD = 2.5 
# The default window length for window_method of level drift detection
WINDOW_LENGTH = 7

# For continuous PLA model fitting:
# The smoothing factor regulate the balance of the smoothing spline:
#       being as smooth as possible, while
#       closely fitting the input data
# This default value is empirically decided on available dataset in developing the solution.
SMOOTH_FACTOR = 2.5 

# The number of points for local LOWESS smoothing, used in SND calculation for drift detection
LOWESS_POINTS = 7

# Heuristical parameters, for post-processing to avoid reporting small or temporary level drifts
THRESHOLD_SMALL_DRIFT = 10.0
THRESHOLD_TEMPORARY_DRIFT_LENGTH = 14
THRESHOLD_TEMPORARY_DRIFT = 20.0

DEFAULT_THRESHOLD = 80

NO_DRIFT = 0
DRIFTED = 1
DRIFT_PART = 2

DRIFT_DIRECTION_BOTH = 'both'
DRIFT_DIRECTION_UP = 'up'
DRIFT_DIRECTION_DOWN = 'down'

ZERO_LEVEL_TOLERANCE = 0.005 
FEATURE_SCALED = False