from datetime import timedelta as td
import json
import re

from django import forms
from django.core.validators import RegexValidator
from hc.front.validators import (CronExpressionValidator, TimezoneValidator,
                                 WebhookValidator)


class NameTagsForm(forms.Form):
    name = forms.CharField(max_length=100, required=False)
    tags = forms.CharField(max_length=500, required=False)
    desc = forms.CharField(required=False)

    def clean_tags(self):
        result = []

        for part in self.cleaned_data["tags"].split(" "):
            part = part.strip()
            if part != "":
                result.append(part)

        return " ".join(result)


class EmailSettingsForm(forms.Form):
    subject = forms.CharField(max_length=100)


class TimeoutForm(forms.Form):
    timeout = forms.IntegerField(min_value=60, max_value=2592000)
    grace = forms.IntegerField(min_value=60, max_value=2592000)

    def clean_timeout(self):
        return td(seconds=self.cleaned_data["timeout"])

    def clean_grace(self):
        return td(seconds=self.cleaned_data["grace"])


class CronForm(forms.Form):
    schedule = forms.CharField(max_length=100,
                               validators=[CronExpressionValidator()])
    tz = forms.CharField(max_length=36, validators=[TimezoneValidator()])
    grace = forms.IntegerField(min_value=1, max_value=43200)


class AddOpsGenieForm(forms.Form):
    error_css_class = "has-error"
    value = forms.CharField(max_length=40)


class AddEmailForm(forms.Form):
    error_css_class = "has-error"
    value = forms.EmailField(max_length=100)


class AddUrlForm(forms.Form):
    error_css_class = "has-error"
    value = forms.URLField(max_length=1000, validators=[WebhookValidator()])


_valid_header_name = re.compile(r'\A[^:\s][^:\r\n]*\Z').match


class AddWebhookForm(forms.Form):
    error_css_class = "has-error"

    url_down = forms.URLField(max_length=1000, required=False,
                              validators=[WebhookValidator()])

    url_up = forms.URLField(max_length=1000, required=False,
                            validators=[WebhookValidator()])

    post_data = forms.CharField(max_length=1000, required=False)

    def __init__(self, *args, **kwargs):
        super(AddWebhookForm, self).__init__(*args, **kwargs)

        self.invalid_header_names = set()
        self.headers = {}
        if "header_key[]" in self.data and "header_value[]" in self.data:
            keys = self.data.getlist("header_key[]")
            values = self.data.getlist("header_value[]")
            for key, value in zip(keys, values):
                if not key:
                    continue

                if not _valid_header_name(key):
                    self.invalid_header_names.add(key)

                self.headers[key] = value

    def clean(self):
        if self.invalid_header_names:
            raise forms.ValidationError("Invalid header names")

        return self.cleaned_data

    def get_value(self):
        val = dict(self.cleaned_data)
        val["headers"] = self.headers
        return json.dumps(val, sort_keys=True)


phone_validator = RegexValidator(regex='^\+\d{5,15}$',
                                 message="Invalid phone number format.")


class AddSmsForm(forms.Form):
    error_css_class = "has-error"
    label = forms.CharField(max_length=100, required=False)
    value = forms.CharField(max_length=16, validators=[phone_validator])


class ChannelNameForm(forms.Form):
    name = forms.CharField(max_length=100, required=False)