from django import forms
from django.contrib.auth.forms import UserCreationForm, AuthenticationForm, PasswordChangeForm
from django.core.exceptions import ValidationError
from .models import User, Feedback


def avatar_file_size(value):
    limit = 2 * 1024 * 1024
    if value.size > limit:
        raise ValidationError('头像文件太大了，请限制在2M之内')


class ProfileForm(forms.ModelForm):
    nickname = forms.CharField(min_length=1,max_length=20,required=False,
                               error_messages={
                                   'min_length': '昵称至少4个字符',
                                   'min_length': '昵称不能多于20个字符',
                               },
                               widget=forms.TextInput())
    avatar = forms.ImageField(required=False, validators=[avatar_file_size],
                              widget=forms.FileInput(attrs={'class' : 'n'}))
    email = forms.EmailField(required=False,
                             error_messages={
                                 'invalid': '请输入有效的Email地址',
                             },
                             widget=forms.EmailInput())
    gender = forms.CharField(min_length=1,max_length=1,required=False,
                             widget=forms.HiddenInput())

    mobile = forms.CharField(min_length=11,max_length=11,required=False,
                             error_messages={
                                 'min_length': '请输入11位手机号',
                                 'max_length': '请输入11位手机号',
                             },
                             widget=forms.NumberInput())

    class Meta:
        model = User
        fields = ['nickname', 'avatar', 'email', 'gender', 'mobile']


class UserLoginForm(AuthenticationForm):
    username = forms.CharField(min_length=4,max_length=30,
                               error_messages={
                                   'min_length': '用户名不少于4个字符',
                                   'max_length': '用户名不能多于30个字符',
                                   'required': '用户名不能为空',
                               },
                               widget=forms.TextInput(attrs={'placeholder': '请输入用户名'}))
    password = forms.CharField(min_length=8,max_length=30,
                               error_messages={
                                   'min_length': '密码不少于8个字符',
                                   'max_length': '密码不能多于30个字符',
                                   'required': '密码不能为空',
                               },
                               widget=forms.PasswordInput(attrs={'placeholder': '请输入密码'}))

    class Meta:
        model = User
        fields = ['username', 'password']

    error_messages = {'invalid_login': '用户名或密码错误', }


class SignUpForm(UserCreationForm):
    username = forms.CharField(min_length=4,max_length=30,
                               error_messages={
                                   'min_length': '用户名不少于4个字符',
                                   'max_length': '用户名不能多于30个字符',
                                   'required': '用户名不能为空',
                               },
                               widget=forms.TextInput(attrs={'placeholder': '请输入用户名'}))
    password1 = forms.CharField(min_length=8, max_length=30,
                                error_messages={
                                    'min_length': '密码不少于8个字符',
                                    'max_length': '密码不能多于30个字符',
                                    'required': '密码不能为空',
                                },
                                widget=forms.PasswordInput(attrs={'placeholder': '请输入密码'}))
    password2 = forms.CharField(min_length=8,max_length=30,
                                error_messages={
                                    'min_length': '密码不少于8个字符',
                                    'max_length': '密码不能多于30个字符',
                                    'required': '密码不能为空',
                                },
                                widget=forms.PasswordInput(attrs={'placeholder': '请确认密码'}))

    class Meta:
        model = User
        fields = ('username', 'password1', 'password2',)

    error_messages = {'password_mismatch': '两次密码不一致', }


class ChangePwdForm(PasswordChangeForm):
    old_password = forms.CharField(error_messages={'required': '不能为空',},
        widget=forms.PasswordInput(attrs={'placeholder': '请输入旧密码'})
    )
    new_password1 = forms.CharField(error_messages={'required': '不能为空',},
        widget=forms.PasswordInput(attrs={'placeholder': '请输入新密码'})
    )
    new_password2 = forms.CharField(error_messages={'required': '不能为空',},
        widget=forms.PasswordInput(attrs={'placeholder': '请输入确认密码'})
    )

class SubscribeForm(forms.ModelForm):

    class Meta:
        model = User
        fields = ['subscribe']

class FeedbackForm(forms.ModelForm):
    content = forms.CharField(min_length=4,max_length=200,
                               error_messages={
                                   'min_length': '至少4个字符',
                                   'max_length': '不能多于200个字符',
                                   'required':'内容不能为空'
                               },
                               widget=forms.Textarea(attrs={'placeholder': '请输入内容'}))
    contact = forms.CharField(required=False,
                              widget=forms.TextInput(attrs={'placeholder':'请输入联系方式'}))
    class Meta:
        model = Feedback
        fields = ['content', 'contact']