from django import forms
from django.utils import timezone
from taggit.forms import TagWidget

from .models import (
                    Profile, User, Animation,
                    Comment, AnimationStats
                    )
from string import punctuation, digits
try:
    from string import letters
except ImportError:
    from string import ascii_letters as letters

from django.contrib.auth.models import User
from django.contrib.auth import authenticate
from .send_mails import generate_activation_key

UNAME_CHARS = letters + "._" + digits
PWD_CHARS = letters + punctuation + digits


position_choices = (
    ("contributor", "Contributor"),
    ("reviewer", "Reviewer")
    )

department_choices = (
    ("computer", "Dept. of Computer Science/Engg."),
    ("mathematics", "Dept. of Mathematics"),
    ("physics", "Dept. of Physics"),
    ("civil", "Dept. of Civil Engineering"),
    ("electrical", "Dept. of Electrical Engg."),
    ("mechanical", "Dept. of Mechanical Engg."),
    ("chemical", "Dept. of Chemistry"),
    ("aerospace", "Dept. of Aerospace Engg."),
    ("biosciences and bioengineering", "Biosciences and  BioEngineering"),
    ("electronics", "Dept. of Electronics"),
    ("energy science and engineering", "Dept. of Energy Science and Engg"),
    ("others", "Others")
    )

title = (
    ("Professor", "Prof."),
    ("Doctor", "Dr."),
    ("Shriman", "Shri"),
    ("Shrimati", "Smt."),
    ("Kumari", "Ku."),
    ("Mr", "Mr."),
    ("Mrs", "Mrs."),
    ("Miss", "Ms."),
    )

source = (
    ("FOSSEE Email", "FOSSEE Email"),
    ("FOSSEE website", "FOSSEE website"),
    ("Google", "Google"),
    ("Social Media", "Social Media"),
    ("From other College", "From other College"),
    ("others", "Others")
    )

states = (
    ("IN-AP",	"Andhra Pradesh"),
    ("IN-AR",	"Arunachal Pradesh"),
    ("IN-AS",	"Assam"),
    ("IN-BR",	"Bihar"),
    ("IN-CT",	"Chhattisgarh"),
    ("IN-GA",	"Goa"),
    ("IN-GJ",	"Gujarat"),
    ("IN-HR",	"Haryana"),
    ("IN-HP",	"Himachal Pradesh"),
    ("IN-JK",	"Jammu and Kashmir"),
    ("IN-JH",	"Jharkhand"),
    ("IN-KA",	"Karnataka"),
    ("IN-KL",	"Kerala"),
    ("IN-MP",	"Madhya Pradesh"),
    ("IN-MH",	"Maharashtra"),
    ("IN-MN",	"Manipur"),
    ("IN-ML",	"Meghalaya"),
    ("IN-MZ",	"Mizoram"),
    ("IN-NL",	"Nagaland"),
    ("IN-OR",	"Odisha"),
    ("IN-PB",	"Punjab"),
    ("IN-RJ",	"Rajasthan"),
    ("IN-SK",	"Sikkim"),
    ("IN-TN",	"Tamil Nadu"),
    ("IN-TG",	"Telangana"),
    ("IN-TR",	"Tripura"),
    ("IN-UT",	"Uttarakhand"),
    ("IN-UP",	"Uttar Pradesh"),
    ("IN-WB",	"West Bengal"),
    ("IN-AN",	"Andaman and Nicobar Islands"),
    ("IN-CH",	"Chandigarh"),
    ("IN-DN",	"Dadra and Nagar Haveli"),
    ("IN-DD",	"Daman and Diu"),
    ("IN-DL",	"Delhi"),
    ("IN-LD",	"Lakshadweep"),
    ("IN-PY",	"Puducherry")
    )


def check_upper(uname):
    for a in uname:
        if a.isupper():
            return True
    return False


class UserRegistrationForm(forms.Form):
    """A Class to create new form for User's Registration.
    It has the various fields and functions required to register
    a new user to the system"""
    required_css_class = 'required'
    errorlist_css_class = 'errorlist'
    username = forms.CharField(max_length=32, help_text='''lowercase, letters, digits,
                               period and underscore only.''')
    email = forms.EmailField()
    password = forms.CharField(max_length=32, widget=forms.PasswordInput())
    confirm_password = forms.CharField(
        max_length=32, widget=forms.PasswordInput())
    title = forms.ChoiceField(choices=title)
    first_name = forms.CharField(max_length=32)
    last_name = forms.CharField(max_length=32)
    phone_number = forms.RegexField(regex=r'^.{10}$',
                                    error_messages={'invalid': "Phone number\
                                    must be entered \
                                    in the format: '9999999999'.\
                                    Up to 10 digits allowed."})
    institute = forms.CharField(max_length=128,
                                help_text='Please write full name of your\
                                 Institute/Organization'
                                )
    department = forms.ChoiceField(help_text='Department you work/study',
                                   choices=department_choices)
    location = forms.CharField(max_length=255, help_text="Place/City")
    pincode = forms.RegexField(regex=r'^.{6}$', error_messages={'invalid': "Please enter valid PINCODE"})
    state = forms.ChoiceField(choices=states)
    how_did_you_hear_about_us = forms.ChoiceField(choices=source)

    def clean_username(self):
        u_name = self.cleaned_data["username"]
        if u_name.strip(UNAME_CHARS):
            msg = "Only letters, digits, period  are"\
                  " allowed in username"
            raise forms.ValidationError(msg)
        if check_upper(u_name):
            raise forms.ValidationError("lowercase only!")
        try:
            User.objects.get(username__exact=u_name)
            raise forms.ValidationError("Username already exists.")
        except User.DoesNotExist:
            return u_name

    def clean_password(self):
        pwd = self.cleaned_data['password']
        if pwd.strip(PWD_CHARS):
            raise forms.ValidationError("Only letters, digits and punctuation\
                                        are allowed in password")
        return pwd

    def clean_confirm_password(self):
        c_pwd = self.cleaned_data['confirm_password']
        pwd = self.data['password']
        if c_pwd != pwd:
            raise forms.ValidationError("Passwords do not match")

        return c_pwd

    def clean_email(self):
        user_email = self.cleaned_data['email']
        if User.objects.filter(email=user_email).exists():
            raise forms.ValidationError("This email already exists")
        return user_email

    def save(self):
        u_name = self.cleaned_data["username"]
        u_name = u_name.lower()
        pwd = self.cleaned_data["password"]
        email = self.cleaned_data["email"]
        new_user = User.objects.create_user(u_name, email, pwd)
        new_user.first_name = self.cleaned_data["first_name"]
        new_user.last_name = self.cleaned_data["last_name"]
        new_user.save()

        cleaned_data = self.cleaned_data
        new_profile = Profile(user=new_user)
        new_profile.institute = cleaned_data["institute"]
        new_profile.department = cleaned_data["department"]
        #new_profile.position = cleaned_data["position"]
        new_profile.phone_number = cleaned_data["phone_number"]
        new_profile.location = cleaned_data["location"]
        new_profile.title = cleaned_data["title"]
        new_profile.state = cleaned_data["state"]
        new_profile.pincode = cleaned_data["pincode"]
        new_profile.how_did_you_hear_about_us = cleaned_data["how_did_you_hear_about_us"]
        new_profile.activation_key = generate_activation_key(new_user.username)
        new_profile.key_expiry_time = timezone.now() + timezone.timedelta(
            days=1)
        new_profile.save()
        key = Profile.objects.get(user=new_user).activation_key
        return u_name, pwd, key


class UserLoginForm(forms.Form):
    """Creates a form which will allow the user to log into the system."""

    username = forms.CharField(max_length=32,
                               widget=forms.TextInput())

    password = forms.CharField(max_length=32,
                               widget=forms.PasswordInput())

    def clean(self):
        super(UserLoginForm, self).clean()
        try:
            u_name, pwd = self.cleaned_data["username"],\
                          self.cleaned_data["password"]
            user = authenticate(username=u_name, password=pwd)
        except Exception:
            raise forms.ValidationError\
                        ("Username and/or Password is not entered")
        if not user:
            raise forms.ValidationError("Invalid username/password")
        return user


class ProfileForm(forms.ModelForm):
    """ profile form for contributors and reviewers """

    class Meta:
        model = Profile
        fields = ['first_name', 'last_name', 'institute', 'department',
                ]

    first_name = forms.CharField(max_length=32)
    last_name = forms.CharField(max_length=32)

    def __init__(self, *args, **kwargs):
        if 'user' in kwargs:
            user = kwargs.pop('user')
        super(ProfileForm, self).__init__(*args, **kwargs)
        self.fields['first_name'].initial = user.first_name
        self.fields['last_name'].initial = user.last_name


class AnimationProposal(forms.ModelForm):
    """Animation form """
    required_css_class = 'required'
    errorlist_css_class = 'errorlist'

    def __init__(self, *args, **kwargs):
        super(AnimationProposal, self).__init__(*args, **kwargs)
        self.fields['subcategory'].widget.attrs['placeholder'] = 'Eg: Quantum Mechanics, Topology'
        # self.fields['outline'].widget.attrs['placeholder'] = 'NOTE: Do\
        #  add info about prerequisites (if any), possible textbooks and \
        #  any other related information'
        self.fields['outline'].widget.attrs={
            'id': 'custom_editor',
            'rows': 10,
            'cols': 50,
            'placeholder': ('NOTE: Do add info about prerequisites (if any), possible textbooks and '
            'any other related information')
        }

    class Meta:
        model = Animation
        fields = ['category', 'subcategory', 'title', 'outline', 'tags']
        widgets = {
            'tags': TagWidget(),
        }


class CommentForm(forms.ModelForm):
    """
    """

    def __init__(self, *args, **kwargs):
        super(CommentForm, self).__init__(*args, **kwargs)
        self.fields['comment'].label = ""

    class Meta:
        model = Comment
        exclude = ['animation', 'created_date', 'commentor',
                   'animation_status']
        widgets = {
            'comments': forms.CharField(),
        }


class UploadAnimationForm(forms.ModelForm):

    def __init__(self, *args, **kwargs):
        super(UploadAnimationForm, self).__init__(*args, **kwargs)
        self.fields['video_path'].label = "Animation(.mp4 only)"

    class Meta:
        model = AnimationStats
        exclude = ['animation', 'views', 'like', 'dislike', 'thumbnail']
        widgets = {
            'video_path': forms.FileInput(),
        }