"""Validators."""
import collections

from switchboard_consumer.constants.track_type import UNKNOWN
from switchboard_consumer.constants.validation import NO_TRACK_TYPE, \
    VALIDATION_CODE
from switchboard_consumer.logic.validation.track.rules import \
    valid_pline, valid_track_sample, valid_track_type


def validate_track_type(track_type, isrc):
    """Validate track type."""
    if not valid_track_type(track_type):
        return {
            'code': VALIDATION_CODE,
            'message': NO_TRACK_TYPE.format(isrc, track_type)
        }


def validate_track_sample(track_sample, isrc):
    """Validate track sample."""
    track_sample_type = track_sample.get('sampleType', UNKNOWN)
    if not valid_track_sample(track_sample_type):
        return {
            'code': VALIDATION_CODE,
            'message':
                'Track with ISRC: {} has '
                'sample with type: {}'.format(isrc, track_sample_type)
        }


def validate_pline(pline):
    """Validate pline."""
    if not valid_pline(pline):
        return {
            'code': VALIDATION_CODE,
            'message': 'Invalid pLine: {}'.format(pline)
        }


def validate_track_samples_names_unique(samples):
    """Validate samples names for uniqueness."""
    all_names = [sample['displayTitle'] for sample in samples]
    duplicates = [item for item, count in
                  collections.Counter(all_names).items() if count > 1]

    if duplicates:
        return {
            'code': VALIDATION_CODE,
            'message': 'Duplicate sample names: {}'.format(duplicates)
        }