from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, BooleanField, SubmitField
from wtforms.validators import DataRequired, Length, Email, Regexp, EqualTo
from wtforms import ValidationError
from ..models import User
from sqlalchemy import or_
class LoginForm(FlaskForm):
    email_or_username = StringField('邮箱/用户名', validators=[DataRequired(), Length(1, 64)])
    password = PasswordField('密码', validators=[DataRequired()])
    remember_me = BooleanField('保持登录信息')        #用于让用户选择是否保持登录状态
    submit = SubmitField('登录')



class RegistrationForm(FlaskForm):
    email = StringField('邮箱', validators=[DataRequired(), Length(1, 64),
                                             Email()])
    username = StringField('用户名', validators=[
        DataRequired(), Length(1, 64),
        Regexp('^[A-Za-z0-9_\u4e00-\u9fa5\.]*$', 0,
               'Usernames must have only letters, numbers, dots or '
               'underscores')])
    password = PasswordField('密码', validators=[
        DataRequired(), EqualTo('password2', message='Passwords must match.')])
    password2 = PasswordField('确认密码', validators=[DataRequired()])
    submit = SubmitField('注册')

    def validate_email(self, field):                #用于验证用户输入的邮箱和用户名是否已经在数据库中被使用了
        if User.query.filter_by(email=field.data.lower()).first():
            raise ValidationError('邮箱已经注册')

    def validate_username(self, field):
        if User.query.filter_by(username=field.data).first():
            raise ValidationError('用户名已被使用')