from datetime import datetime
import sqlalchemy
from flask_sqlalchemy import SQLAlchemy
from flask_login import UserMixin


###########################################
# Model classes for describing SQL tables #
###########################################

# The "db" object gets bound to the Flask app in app.py.
db = SQLAlchemy()


class UploadSolar(db.Model):
    __tablename__ = 'upload_solar'
    id = db.Column(db.Integer, primary_key=True)
    upload_user = db.Column(db.Integer, sqlalchemy.ForeignKey('registered_user.id'), nullable=True)
    institution = db.Column(db.Integer, sqlalchemy.ForeignKey('institution.id'), nullable=True)
    upload_hash = db.Column(db.String, nullable=False)
    timestamp = db.Column(db.DateTime, default=datetime.utcnow, nullable=False)
    program = db.Column(db.String, nullable=True)
    subject = db.Column(db.String, nullable=True)
    subject_custom = db.Column(db.String, nullable=True)
    grade = db.Column(db.Integer, nullable=True)
    text_type = db.Column(db.String, nullable=True)
    text_type_custom = db.Column(db.String, nullable=True)
    school_year = db.Column(db.String, nullable=True)
    grammar_corrections = db.Column(db.String, nullable=True)
    upload_file_hashes = db.Column(sqlalchemy.types.ARRAY(db.String), nullable=True)


class ContractsSolar(db.Model):
    __tablename__ = 'contracts_solar'
    id = db.Column(db.Integer, primary_key=True)
    institution = db.Column(db.Integer, sqlalchemy.ForeignKey('institution.id'), nullable=False)
    upload_user = db.Column(db.Integer, sqlalchemy.ForeignKey('registered_user.id'), nullable=True)
    timestamp = db.Column(db.DateTime, default=datetime.utcnow, nullable=False)
    file_contract = db.Column(db.String, nullable=False)
    original_filename = db.Column(db.String, nullable=True)
    contract_type = db.Column(db.String, nullable=False)


class RegisteredUser(UserMixin, db.Model):
    __tablename__ = 'registered_user'
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String, nullable=False)
    email = db.Column(db.String, nullable=False, unique=True)
    role = db.Column(db.String, nullable=False)
    pass_hash = db.Column(db.String, nullable=False)
    active = db.Column(db.Boolean, nullable=True)
    last_login = db.Column(db.DateTime, nullable=True)
    registered = db.Column(db.DateTime, nullable=True)
    is_removed = db.Column(db.Boolean, nullable=False, default=False, server_default="false")


class UserInstitutionMapping(db.Model):
    __tablename__ = 'user_institution_mapping'
    id = db.Column(db.Integer, primary_key=True)
    user = db.Column(db.Integer, sqlalchemy.ForeignKey('registered_user.id'), nullable=False)
    institution = db.Column(db.Integer, sqlalchemy.ForeignKey('institution.id'), nullable=False)
    role = db.Column(db.String, nullable=False)


class UserCooperationHistory(db.Model):
    __tablename__ = 'user_cooperation'
    id = db.Column(db.Integer, primary_key=True)
    user = db.Column(db.Integer, sqlalchemy.ForeignKey('registered_user.id'), nullable=False)
    institution = db.Column(db.Integer, sqlalchemy.ForeignKey('institution.id'), nullable=False)
    role = db.Column(db.String, nullable=False)
    school_year = db.Column(db.String, nullable=False)
    badge_text = db.Column(db.String, nullable=True)


class Institution(db.Model):
    __tablename__ = 'institution'
    id = db.Column(db.Integer, primary_key=True)
    name =  db.Column(db.String, nullable=False, unique=True)
    region =  db.Column(db.String, nullable=False)
    is_removed = db.Column(db.Boolean, nullable=False, default=False, server_default="false")


class CorpusAccess(db.Model):
    __tablename__ = 'corpus_access'
    id = db.Column(db.Integer, primary_key=True)
    institution = db.Column(db.Integer, sqlalchemy.ForeignKey('institution.id'), nullable=False)
    corpus =  db.Column(db.String, nullable=False)


class InstitutionContract(db.Model):
    __tablename__ = 'institution_contract'
    id = db.Column(db.Integer, primary_key=True)
    institution = db.Column(db.Integer, sqlalchemy.ForeignKey('institution.id'), nullable=False)
    corpus =  db.Column(db.String, nullable=False)
    timestamp = db.Column(db.DateTime, default=datetime.utcnow, nullable=False)
    file_contract =  db.Column(db.String, nullable=True)
    original_filename = db.Column(db.String, nullable=True)