#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import csv
import argparse
import re
import string
import sys
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker

from models import Base, Student, Test, Question

# SIIUE names have alien strings like "(TE)" and are sometimes capitalized
# We remove them so that students dont keep asking what it means
def fix(name):
    return string.capwords(re.sub('\(.*\)', '', name).strip())

# ===========================================================================
#   Parse command line options
argparser = argparse.ArgumentParser(description='Create new database from a CSV file (SIIUE format)')
argparser.add_argument('--db', default='students.db', type=str, help='database filename')
argparser.add_argument('csvfile', nargs='?', type=str, default='', help='CSV filename')
args = argparser.parse_args()

# ===========================================================================
engine = create_engine('sqlite:///{}'.format(args.db), echo=False)

# Criate schema if needed
Base.metadata.create_all(engine)

Session = sessionmaker(bind=engine)

# --- start session ---
try:
    session = Session()

    # add administrator and fake student accounts
    session.add_all([
        Student(id='0', name='Professor', password=''),
        Student(id='student1', name='Student1', password=''),
        Student(id='student2', name='Student2', password=''),
        Student(id='student3', name='Student3', password=''),
        Student(id='student4', name='Student4', password=''),
        Student(id='student5', name='Student5', password=''),
        ])

    # add enrolled students from csv file
    if args.csvfile:
        try:
            csvreader = csv.DictReader(open(args.csvfile, encoding='iso-8859-1'), delimiter=';', quotechar='"')
        except EnvironmentError:
            print('CSV file "{0}" not found!'.format(args.csvfile))
        else:
            session.add_all([Student(id=r['N.º'], name=fix(r['Nome']), password='') for r in csvreader])

    session.commit()

except Exception:
    session.rollback()
    print('Erro: Dados já existentes na base de dados?')
    sys.exit(1)

else:
    n = session.query(Student).count()
    print('Base de dados inicializada com {} utilizadores.'.format(n))

# --- end session ---