from delphi_api.errors import Codes, InvalidInputError
from delphi_api.v3.data_models.postgres_db import Playlist, db
from delphi_api.v3.data_models.schemas.models import PlaylistSchema, PlaylistSimpleSchema
from delphi_api.v3.view_models.params import Params
from delphi_api.v3.view_models.query_builder import QueryBuilder


class PlaylistsViewModel:

    @staticmethod
    def validate_params(params: Params):
        """Check the search parameters provided by the client are compatible before continuing"""
        err = False
        if err:
            raise InvalidInputError({
                'code': Codes.invalid_input.value,
                'description': err,
            })

    @staticmethod
    def get_one(params: dict):
        params = Params(**params)
        result = db.session.query(Playlist).get_or_404(params.playlist_id)
        return PlaylistSchema().dump(result)

    @staticmethod
    def get_many(params: dict):
        params = Params(**params)
        PlaylistsViewModel.validate_params(params)
        q = db.session.query(Playlist)
        q = QueryBuilder.or_filters_from_params(q, params, parent=Playlist)
        if params.sort_by != 'rank':
            q = QueryBuilder.add_sort_clause(q, params, parent=Playlist)
            q = QueryBuilder.add_query_limit_offset(q, params)
        result = PlaylistSimpleSchema(many=True).dump(q.all())
        result = QueryBuilder.sort_results(result, params)
        result = QueryBuilder.limit_offset_results(result, params)
        return result