import re
from captcha.fields import CaptchaField
from django import forms
from django.forms.util import ErrorList
from django.utils.translation import ugettext_lazy as _
import time
from boards.models import TITLE_MAX_LENGTH, User
from neboard import settings
from boards import utils

LAST_POST_TIME = "last_post_time"
LAST_LOGIN_TIME = "last_login_time"

LOGIN_DELAY = 60 * 60

MAX_TEXT_LENGTH = 30000
MAX_IMAGE_SIZE = 8 * 1024 * 1024


class PlainErrorList(ErrorList):
    def __unicode__(self):
        return self.as_text()

    def as_text(self):
        return ''.join([u'(!) %s ' % e for e in self])


class NeboardForm(forms.Form):

    def as_p(self):
        "Returns this form rendered as HTML <p>s."
        return self._html_output(
            normal_row='<div class="form-row">'
                       '<div class="form-label">'
                       '%(label)s'
                       '</div>'
                       '<div class="form-input">'
                       '%(field)s'
                       '</div>'
                       '%(help_text)s'
                       '</div>',
            error_row='<div class="form-errors">%s</div>',
            row_ender='</p>',
            help_text_html=' <span class="helptext">%s</span>',
            errors_on_separate_row=True)


class PostForm(NeboardForm):

    title = forms.CharField(max_length=TITLE_MAX_LENGTH, required=False)
    text = forms.CharField(widget=forms.Textarea, required=False)
    image = forms.ImageField(required=False)

    # This field is for spam prevention only
    email = forms.CharField(max_length=100, required=False)

    session = None

    def clean_title(self):
        title = self.cleaned_data['title']
        if title:
            if len(title) > TITLE_MAX_LENGTH:
                raise forms.ValidationError(_('Title must have less than %s '
                                              'characters') %
                                            str(TITLE_MAX_LENGTH))
        return title

    def clean_text(self):
        text = self.cleaned_data['text']
        if text:
            if len(text) > MAX_TEXT_LENGTH:
                raise forms.ValidationError(_('Text must have less than %s '
                                              'characters') %
                                            str(MAX_TEXT_LENGTH))
        return text

    def clean_image(self):
        image = self.cleaned_data['image']
        if image:
            if image._size > MAX_IMAGE_SIZE:
                raise forms.ValidationError(_('Image must be less than %s '
                                              'bytes') % str(MAX_IMAGE_SIZE))
        return image

    def clean(self):
        cleaned_data = super(PostForm, self).clean()

        if not self.session:
            raise forms.ValidationError('Humans have sessions')

        if cleaned_data['email']:
            raise forms.ValidationError('A human cannot enter a hidden field')

        if not self.errors:
            self._clean_text_image()

        if not self.errors and self.session:
            self._validate_posting_speed()

        return cleaned_data

    def _clean_text_image(self):
        text = self.cleaned_data.get('text')
        image = self.cleaned_data.get('image')

        if (not text) and (not image):
            error_message = _('Either text or image must be entered.')
            self._errors['text'] = self.error_class([error_message])

    def _validate_posting_speed(self):
        can_post = True

        if LAST_POST_TIME in self.session:
            now = time.time()
            last_post_time = self.session[LAST_POST_TIME]

            current_delay = int(now - last_post_time)

            if current_delay < settings.POSTING_DELAY:
                error_message = _('Wait %s seconds after last posting') % str(
                    settings.POSTING_DELAY - current_delay)
                self._errors['text'] = self.error_class([error_message])

                can_post = False

        if can_post:
            self.session[LAST_POST_TIME] = time.time()


class ThreadForm(PostForm):
    regex_tags = re.compile(ur'^[\w\s\d]+$', re.UNICODE)
    tags = forms.CharField(max_length=100)

    def clean_tags(self):
        tags = self.cleaned_data['tags']

        if tags:
            if not self.regex_tags.match(tags):
                raise forms.ValidationError(
                    _('Inappropriate characters in tags.'))

        return tags

    def clean(self):
        cleaned_data = super(ThreadForm, self).clean()

        return cleaned_data


class PostCaptchaForm(PostForm):
    captcha = CaptchaField()

    def __init__(self, *args, **kwargs):
        self.request = kwargs['request']
        del kwargs['request']

        super(PostCaptchaForm, self).__init__(*args, **kwargs)

    def clean(self):
        cleaned_data = super(PostCaptchaForm, self).clean()

        success = self.is_valid()
        utils.update_captcha_access(self.request, success)

        if success:
            return cleaned_data
        else:
            raise forms.ValidationError(_("Captcha validation failed"))


class ThreadCaptchaForm(ThreadForm):
    captcha = CaptchaField()

    def __init__(self, *args, **kwargs):
        self.request = kwargs['request']
        del kwargs['request']

        super(ThreadCaptchaForm, self).__init__(*args, **kwargs)

    def clean(self):
        cleaned_data = super(ThreadCaptchaForm, self).clean()

        success = self.is_valid()
        utils.update_captcha_access(self.request, success)

        if success:
            return cleaned_data
        else:
            raise forms.ValidationError(_("Captcha validation failed"))


class SettingsForm(NeboardForm):

    theme = forms.ChoiceField(choices=settings.THEMES,
                              label=_('Theme'))


class ModeratorSettingsForm(SettingsForm):

    moderate = forms.BooleanField(required=False, label=_('Enable moderation '
                                                          'panel'))


class LoginForm(NeboardForm):

    user_id = forms.CharField()

    session = None

    def clean_user_id(self):
        user_id = self.cleaned_data['user_id']
        if user_id:
            users = User.objects.filter(user_id=user_id)
            if len(users) == 0:
                raise forms.ValidationError(_('No such user found'))

        return user_id

    def _validate_login_speed(self):
        can_post = True

        if LAST_LOGIN_TIME in self.session:
            now = time.time()
            last_login_time = self.session[LAST_LOGIN_TIME]

            current_delay = int(now - last_login_time)

            if current_delay < LOGIN_DELAY:
                error_message = _('Wait %s minutes after last login') % str(
                    (LOGIN_DELAY - current_delay) / 60)
                self._errors['user_id'] = self.error_class([error_message])

                can_post = False

        if can_post:
            self.session[LAST_LOGIN_TIME] = time.time()

    def clean(self):
        if not self.session:
            raise forms.ValidationError('Humans have sessions')

        self._validate_login_speed()

        cleaned_data = super(LoginForm, self).clean()

        return cleaned_data