from django.conf import settings
from django.db import transaction
from django.db.models import Q
from django import forms
from django.forms import ModelForm, ModelChoiceField
from django.utils import timezone
from board.models import Ban, Post, Report, ReportReason, ReportRecord
from hcaptcha.fields import hCaptchaField


class PostForm(ModelForm):
    """
    A form used for new threads for posts.

    This requires the board and the IP address to be specified.
    """

    hcaptcha = hCaptchaField() if settings.USE_HCAPTCHA else None

    class Meta:
        model = Post
        fields = ["subject", "name", "text", "image"]

    def __init__(self, *args, board, ip, **kwargs):
        super(PostForm, self).__init__(*args, **kwargs)
        self.instance.board = board
        self.instance.ip = ip


class ReplyForm(PostForm):
    """
    A form used for replies to posts.

    This requires the OP post, the reply post, the board, and the IP address be
    specified.
    """

    hcaptcha = hCaptchaField() if settings.USE_HCAPTCHA else None

    class Meta:
        model = Post
        fields = ["name", "text", "bump", "image"]

    def __init__(self, *args, op, reply, **kwargs):
        super(ReplyForm, self).__init__(*args, **kwargs)
        self.instance.op = op
        self.instance.reply = reply


class ReportForm(ModelForm):
    """
    A form used to create reports on posts.

    This requires the board and the IP address to be specified.
    """

    # uses report_form.html

    class Meta:
        model = Report
        fields = ["reason"]

    def __init__(self, *args, op, board, ip, **kwargs):
        super(ReportForm, self).__init__(*args, **kwargs)
        self.instance.ip = ip
        self.op = op
        queryset = ReportReason.objects.filter(Q(board=None) | Q(board=board))
        self.fields["reason"] = ModelChoiceField(queryset=queryset)

    def clean(self):
        # Get or create the record before creating the model
        with transaction.atomic():
            try:
                record = ReportRecord.objects.get(post=self.op)
            except ReportRecord.DoesNotExist:
                record = ReportRecord.objects.create(post=self.op)
        self.instance.record = record
        return super(ReportForm, self).clean()


class BanForm(ModelForm):
    """
    A form used to create bans based on specific posts.
    """

    # uses ban_form.html
    duration = forms.IntegerField(label="Duration (days)", min_value=1, required=False)

    class Meta:
        model = Ban
        fields = ["ban_reason"]

    def __init__(self, *args, op, **kwargs):
        super(BanForm, self).__init__(*args, **kwargs)
        self.op = op
        self.instance.board = op.board
        self.instance.ip = op.ip

    def clean(self):
        super(BanForm, self).clean()
        now = timezone.now()
        duration = self.cleaned_data["duration"]
        if duration:
            expires = now + timezone.timedelta(days=duration)
        else:
            expires = None
        self.instance.expires = expires