"""Performer Validator functions."""

from backend.constants import error
from backend.constants import performer as pfmr_const
from backend.utils.validation import format_error


def validate_performers_complete(tuid, performers):
    """Run all validators for a set of track performers.

    Args:
        tuid (int): Unique id of track
        performers (list): List of performers to update track with

    Returns:
        dict
    """
    error_obj = (
        validate_primary_performers(performers) or
        validate_performers_type(performers) or
        validate_performers_birth_name(performers))

    if error_obj:
        error_obj['tuid'] = tuid

    return error_obj


def validate_primary_performers(performers):
    """Verify primary performers are filled in.

    Args:
        performers (list): List of performers to update track with

    Returns:
        dict
    """
    error_obj = {}
    for performer in performers:
        if performer['type'] == 'primary':
            return error_obj

    error_obj['performers'] = format_error(
        validator=error.REQUIRED_CODE,
        message=error.NO_PRIMARY_PERFORMER_MSG,
        error_code=error.MISSING_PRIMARY_PERFORMER
    )

    return error_obj


def validate_performers_type(performers):
    """Validate all performer types are valid.

    Args:
        performers (list): List of performers to update track with

    Returns:
        dict
    """
    error_obj = {}
    for performer in performers:
        if performer.get('type', '') \
                not in pfmr_const.PERFORMER_TYPES:
            error_obj['performers'] = format_error(
                validator=error.INVALID_CODE,
                message='Invalid performer type',
                error_code=error.INVALID_PERFORMER_TYPE
            )
            break

    return error_obj


def validate_performers_birth_name(performers):
    """Validate all performer birth names are filled in.

    Args:
        performers (list): List of performers to update track with

    Returns:
        dict
    """
    error_obj = {}
    for performer in performers:
        birth_name = (performer.get('birth_name') or '').strip()
        if not birth_name:
            error_obj['performers'] = format_error(
                validator=error.REQUIRED_CODE,
                message='Birth name is required',
                error_code=error.MISSING_BIRTH_NAME
            )
            break

    return error_obj