# coding=utf-8
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import plpy
from utilities import _assert
from utilities import is_valid_psql_type
from utilities import NUMERIC, ONLY_ARRAY
from validate_args import get_expr_type

def validate_dependent_var_for_minibatch(table_name, var_name, expr_type=None):
    # The dependent variable is always a double precision array in
    # preprocessed data (so check for numeric types)
    if not expr_type:
        expr_type = get_expr_type(var_name, table_name)
    _assert(is_valid_psql_type(expr_type, NUMERIC | ONLY_ARRAY),
            "Dependent variable column {0} in table {1} "
            "should be a numeric array.".format(var_name, table_name))

    query = """SELECT array_upper({var_name}, 2) > 1 AS is_encoded FROM
              {table_name} LIMIT 1;""".format(**locals())
    result = plpy.execute(query)
    if not result[0]["is_encoded"]:
        plpy.error("Dependent variable column {0} in table {1} should be "
                   "minibatched and one hot encoded. You might need to re run "
                   "the minibatch_preprocessor function and make sure that "
                   "the variable is encoded.".format(var_name, table_name))

def validate_bytea_var_for_minibatch(table_name, var_name, expr_type=None):
    if not expr_type:
        expr_type = get_expr_type(var_name, table_name)
    _assert(expr_type == 'bytea',
            "Dependent variable column {0} in table {1} "
            "should be minibatched. You might need to re run "
            "the preprocessor function.".format(var_name, table_name))