from app import db
from marshmallow import Schema, fields, ValidationError, pre_load

class Book(db.Model):
    __tablename__ = 'books'
    id = db.Column(db.Integer, primary_key = True)
    title = db.Column(db.String(255))
    file = db.Column(db.String(255))
    cover = db.Column(db.String(255))
    fileformat = db.Column(db.String(255))
    author = db.relationship('Author')

    def __init__(self, title, file, cover, fileformat):
        self.title = title
        self.file = file
        self.cover = cover
        self.fileformat = fileformat

    def __repr__(self):
        return '<Title %r>' % self.title

    def get_id(self):
        return self.id


class Author(db.Model):
    __tablename__ = 'authors'
    id = db.Column(db.Integer(), primary_key=True)
    user_id = db.Column(db.Integer(), db.ForeignKey('books.id'))
    author_name = db.Column(db.String(50))


    def __init__(self, author_name):
        self.author_name = author_name

class BookSchema(Schema):
    id = fields.Int(dump_only=True)
    title = fields.Str()
    author = fields.Str()
    file = fields.Str()
    cover = fields.Str()
    fileformat = fields.Str()

def must_not_be_blank(data):
    if not data:
        raise ValidationError('Data not provided.')