from __future__ import unicode_literals

import datetime

from django.db import models
from django.contrib.auth.models import AbstractUser
from django.core.validators import RegexValidator
from django.db.models import Q, signals

from .validators import CallUsernameValidator
from .signals import checkForShadowCall

class Contest(models.Model):
	name = models.CharField(max_length=20)
	shortName = models.CharField(max_length=20, unique=True)
	callQrg = models.ForeignKey("Frequency", models.SET_NULL, null=True, blank=True)
	deadline = models.DateTimeField()

	def __str__(self):
		return self.name

class Reference(models.Model):
	name = models.CharField(max_length=20, unique=True, db_index=True)
	description = models.TextField()

	def __str__(self):
		return self.name

class EntryCategory(models.Model):
	name = models.CharField(max_length=64, unique=True)
	description = models.TextField(blank=True)

	def __str__(self):
		return self.name

class ShadowCall(models.Model):
	username = models.CharField(max_length=20, unique=True, db_index=True, validators=[CallUsernameValidator()])
	ref = models.ForeignKey(Reference, models.SET_NULL,null=True, blank=True)

	location = models.CharField(max_length=128, default="", blank=True)
	opName = models.CharField(max_length=128, default="", blank=True)
	regTime = models.DateTimeField(null=True, default=None)

	def __str__(self):
		return self.username

class User(AbstractUser):
	ref = models.ForeignKey(Reference, models.SET_NULL, null=True, blank=True)
	cat = models.ForeignKey(EntryCategory, models.SET_NULL, null=True, blank=True)

	location = models.CharField(max_length=128, default="", blank=True)
	opName = models.CharField(max_length=128, default="", blank=True)
	regTime = models.DateTimeField(null=True, default=None)

	def __init__(self, *args, **kwargs):
		super(User, self).__init__(*args, **kwargs)
		self._meta.get_field("username").validators = [CallUsernameValidator()]

	def getQSOCount(self):
		return self.qso_set.count()

	def getCfmdQSOCount(self):
		return self.qso_set.filter(~Q(cfmdQSO=None)).count()

	def getCfmdRefCount(self):
		return len(set(map(lambda _x: _x["refStr"], self.qso_set.filter(ref__isnull=False).values("ref", "refStr"))))
signals.post_save.connect(checkForShadowCall, sender=User)

class Band(models.Model):
	name = models.CharField(max_length=10)
	contest = models.ForeignKey(Contest)

	def __str__(self):
		return self.name

class Frequency(models.Model):
	# qrg
	# band
	channel = models.CharField(max_length=3)
	qrg = models.DecimalField(max_digits=7, decimal_places=3)
	band = models.ForeignKey(Band)

	note = models.CharField(max_length=50, blank=True)

	def __str__(self):
		return "Channel %s: %s MHz" % (self.channel, self.qrg)

class QSO(models.Model):
	reportValidator = RegexValidator("[1-5][1-9]")

	class Meta:
		index_together = [
			["owner", "call"],
		]

	owner = models.ForeignKey(User, db_index=True)
	time = models.DateTimeField(blank=True)
	call = models.CharField(max_length=20, db_index=True)
	callRef = models.ForeignKey(User, models.SET_NULL, related_name='qsoref', null=True, blank=True, default=None)
	band = models.ForeignKey(Band)

	reportTX = models.CharField(max_length=7, default=59, verbose_name='RS-S', validators=[reportValidator])
	reportRX = models.CharField(max_length=7, default=59, verbose_name='RS-R', validators=[reportValidator])

	ownNo = models.IntegerField(verbose_name='No-S')
	otherNo = models.IntegerField(verbose_name='No-R', null=True, blank=True)

	refStr = models.CharField(max_length=20, verbose_name="EXC")
	ref = models.ForeignKey(Reference, models.SET_NULL, null=True, blank=True)

	remarks = models.CharField(max_length=50, blank=True, default=None)

	cfmdQSO = models.ForeignKey("QSO", models.SET_NULL, null=True, blank=True, default=None)

	CFMD_SEC = 300

	def checkQSOData(self):
		""" Match strdata to log rows. Only call, if you intent to save this object if we return True! """
		# find reference
		changed = False
		if self.refStr:
			# Old reference exists?
			if self.ref and self.ref.name != self.refStr:
				self.ref = None
				changed = True

			if not self.ref:
				# find matching ref
				try:
					self.ref = Reference.objects.get(name=self.refStr)
					changed = True
				except Reference.DoesNotExist:
					pass

		# find call
		if not self.callRef or self.callRef.username != self.call:
			try:
				self.callRef = User.objects.get(username=self.call)
				changed = True
			except User.DoesNotExist:
				if self.callRef:
					changed = True
				self.callRef = None

		# find matching qso
		if self.cfmdQSO:
			# check if this still checks out
			q = self.cfmdQSO
			if (self.time - q.time).total_seconds() <= self.CFMD_SEC and \
				self.ref and self.owner.ref and \
				self.ref == q.owner.ref and self.owner.ref == q.ref and \
				self.band == q.band:
				# checks out
				pass
			else:
				changed = True
				self.cfmdQSO.cfmdQSO = None
				self.cfmdQSO = None

		if self.ref and self.callRef and self.callRef.ref and not self.cfmdQSO:
			# look for a matching line
			q = QSO.objects.filter(
				(Q(time__gte=self.time + datetime.timedelta(0, self.CFMD_SEC)) | Q(time__gte=self.time - datetime.timedelta(0, self.CFMD_SEC))),
				owner__ref=self.ref,
				ref=self.owner.ref,
				band=self.band)

			if q.count() == 1:
				changed = True
				q[0].cfmdQSO = self
				q[0].save(checkQSO=False)
				self.cfmdQSO = q[0]

		return changed

	def save(self, checkQSO=True, *args, **kwargs):
		if checkQSO:
			self.checkQSOData()

		super(QSO, self).save(*args, **kwargs)

	def __str__(self):
		return "QSO no %s at from %s %s with %s@%s %s/%s" % (self.ownNo, self.time.strftime("%H:%M"), self.owner.username, self.call, self.refStr, self.reportTX, self.reportRX)