from __future__ import unicode_literals

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

from .validators import CallUsernameValidator

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)

	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 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)

	def __str__(self):
		return self.username

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

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

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)
	band = models.ForeignKey(Band)

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

	ownNo = models.IntegerField(verbose_name='Nr-S')
	otherNo = models.IntegerField(verbose_name='Nr-R')

	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)

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