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):
    #lht: 登录表单，继承Django内置认证表单
    def __init__(self, *args, **kwargs):
        #lht: 调用父类构造函数
        super(LoginForm, self).__init__(*args, **kwargs)
        #lht: 自定义用户名和密码字段的显示样式
        self.fields['username'].widget = widgets.TextInput(
            attrs={'placeholder': "username", "class": "form-control"})
        self.fields['password'].widget = widgets.PasswordInput(
            attrs={'placeholder': "password", "class": "form-control"})


class RegisterForm(UserCreationForm):
    #lht: 用户注册表单，继承Django内置用户创建表单
    def __init__(self, *args, **kwargs):
        #lht: 调用父类构造函数
        super(RegisterForm, self).__init__(*args, **kwargs)
        #lht: 自定义各字段的显示样式
        self.fields['username'].widget = widgets.TextInput(
            attrs={'placeholder': "username", "class": "form-control"})
        self.fields['email'].widget = widgets.EmailInput(
            attrs={'placeholder': "email", "class": "form-control"})
        self.fields['password1'].widget = widgets.PasswordInput(
            attrs={'placeholder': "password", "class": "form-control"})
        self.fields['password2'].widget = widgets.PasswordInput(
            attrs={'placeholder': "repeat password", "class": "form-control"})

    def clean_email(self):
        #lht: 验证邮箱唯一性
        email = self.cleaned_data['email']
        if get_user_model().objects.filter(email=email).exists():
            raise ValidationError(_("email already exists"))
        return email

    class Meta:
        #lht: 指定模型和字段
        model = get_user_model()
        fields = ("username", "email")


class ForgetPasswordForm(forms.Form):
    #lht: 忘记密码表单
    #lht: 新密码字段
    new_password1 = forms.CharField(
        label=_("New password"),
        widget=forms.PasswordInput(
            attrs={
                "class": "form-control",
                'placeholder': _("New password")
            }
        ),
    )

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

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

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

    def clean_new_password2(self):
        #lht: 验证两次输入的密码是否一致
        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"))
        #lht: 验证密码强度
        password_validation.validate_password(password2)

        return password2

    def clean_email(self):
        #lht: 验证邮箱是否存在
        user_email = self.cleaned_data.get("email")
        if not BlogUser.objects.filter(
                email=user_email
        ).exists():
            #lht: todo 这里的报错提示可以判断一个邮箱是不是注册过，如果不想暴露可以修改
            raise ValidationError(_("email does not exist"))
        return user_email

    def clean_code(self):
        #lht: 验证验证码是否正确
        code = self.cleaned_data.get("code")
        #lht: 调用工具函数验证验证码
        error = utils.verify(
            email=self.cleaned_data.get("email"),
            code=code,
        )
        if error:
            raise ValidationError(error)
        return code


class ForgetPasswordCodeForm(forms.Form):
    #lht: 忘记密码时获取验证码的表单
    #lht: 邮箱字段
    email = forms.EmailField(
        label=_('Email'),
    )