from django import forms
from django.contrib.auth import get_user_model, password_validation
from django.contrib.auth.forms import AuthenticationForm, UserCreationForm
from django.core.exceptions import ValidationError
from django.forms import widgets
from django.utils.translation import gettext_lazy as _
from . import utils
from .models import BlogUser


class LoginForm(AuthenticationForm):
    #sjt 登录表单：定义登录表单字段样式
    def __init__(self, *args, **kwargs):
        super(LoginForm, self).__init__(*args, **kwargs)
        # sjt 设置用户名输入框样式
        self.fields['username'].widget = widgets.TextInput(
            attrs={'placeholder': "username", "class": "form-control"})
        # sjt 设置密码输入框样式
        self.fields['password'].widget = widgets.PasswordInput(
            attrs={'placeholder': "password", "class": "form-control"})


class RegisterForm(UserCreationForm):
    #sjt 注册表单：验证用户名、邮箱、密码合法性
    def __init__(self, *args, **kwargs):
        super(RegisterForm, self).__init__(*args, **kwargs)
        # sjt 设置用户名输入框样式
        self.fields['username'].widget = widgets.TextInput(
            attrs={'placeholder': "username", "class": "form-control"})
        # sjt 设置邮箱输入框样式
        self.fields['email'].widget = widgets.EmailInput(
            attrs={'placeholder': "email", "class": "form-control"})
        # sjt 设置密码输入框样式
        self.fields['password1'].widget = widgets.PasswordInput(
            attrs={'placeholder': "password", "class": "form-control"})
        # sjt 设置确认密码输入框样式
        self.fields['password2'].widget = widgets.PasswordInput(
            attrs={'placeholder': "repeat password", "class": "form-control"})

    def clean_email(self):
        #sjt 验证邮箱唯一性：已存在则抛出异常
        email = self.cleaned_data['email']
        if get_user_model().objects.filter(email=email).exists():
            raise ValidationError(_("email already exists"))
        return email

    class Meta:
        model = get_user_model()  # sjt 关联用户模型
        fields = ("username", "email")  # sjt 表单包含的字段


class ForgetPasswordForm(forms.Form):
    #sjt 密码找回表单：验证邮箱、验证码、新密码合法性
    new_password1 = forms.CharField(
        label=_("New password"),
        widget=forms.PasswordInput(
            attrs={
                "class": "form-control",
                'placeholder': _("New password")
            }
        ),
    )  # sjt 新密码字段

    new_password2 = forms.CharField(
        label="确认密码",
        widget=forms.PasswordInput(
            attrs={
                "class": "form-control",
                'placeholder': _("Confirm password")
            }
        ),
    )  # sjt 确认密码字段

    email = forms.EmailField(
        label='邮箱',
        widget=forms.TextInput(
            attrs={
                'class': 'form-control',
                'placeholder': _("Email")
            }
        ),
    )  # sjt 邮箱字段

    code = forms.CharField(
        label=_('Code'),
        widget=forms.TextInput(
            attrs={
                'class': 'form-control',
                'placeholder': _("Code")
            }
        ),
    )  # sjt 验证码字段

    def clean_new_password2(self):
        #sjt 验证两次输入密码一致性，并检查密码强度
        password1 = self.data.get("new_password1")
        password2 = self.data.get("new_password2")
        if password1 and password2 and password1 != password2:
            raise ValidationError(_("passwords do not match"))
        password_validation.validate_password(password2)  # sjt 调用Django密码验证器
        return password2

    def clean_email(self):
        #sjt 验证邮箱是否已注册
        user_email = self.cleaned_data.get("email")
        if not BlogUser.objects.filter(
                email=user_email
        ).exists():
            raise ValidationError(_("email does not exist"))
        return user_email

    def clean_code(self):
        #sjt 验证验证码有效性
        code = self.cleaned_data.get("code")
        error = utils.verify(
            email=self.cleaned_data.get("email"),
            code=code,
        )
        if error:
            raise ValidationError(error)
        return code


class ForgetPasswordCodeForm(forms.Form):
    #sjt 发送验证码表单：验证邮箱格式
    email = forms.EmailField(
        label=_('Email'),
    )  # sjt 邮箱字段（用于发送验证码）