# -*- coding: utf-8 -*-

import logging as log
from .models import Resitel
from reversion import revisions as reversion

def merge_props(r1, r2, prop, pretend=True, smaller=False, equal=True):
	"""Merge r2.`prop` into r1.`prop`.

	If r1.`prop` unset, use r1.`prop`=r2.`prop`.
	If both set and equal=True, warn if not equal.
	If both set and smaller=True, use the smaller one.
	With pretend=True does not modify r1.
	"""
	a1 = r1.__getattribute__(prop)
	a2 = r2.__getattribute__(prop)
	if not a1:
		if not pretend:
			r1.__setattr__(prop, a2)
	elif a2:
		if equal and a1 != a2:
			log.warn("merge: Ruzna %s: %s VS %s", prop, a1, a2)
		if smaller:
			if not pretend:
				r1.__setattr__(prop, min(a1, a2))


def merge_Resitel(rbase, rmerge, pretend=True):
	"""Zahrne data a vztahy Resitele rmerge do Resitele rbase, pak smaze rmerge.

	Selze pro uzivatele s user!=NULL. S pretend=True nezmeni databazi.
	"""
	# Ma relace: skola
	# Je v relaci: user, reseni, soustredeni_ucastnici, vysledky_base(VIEW)

	log.info("merge: %s <- %s", unicode(rbase), unicode(rmerge))

	assert not rbase.user
	assert not rmerge.user
	assert rbase != rmerge

	if (rbase.jmeno != rmerge.jmeno) or (rbase.prijmeni != rmerge.prijmeni):
		log.error("merge: Ruzna jmena: %s VS %s", rbase, rmerge)
	if rbase.rok_maturity != rmerge.rok_maturity:
		log.error("merge: Ruzne roky maturity: %s VS %s", rbase.rok_maturity, rmerge.rok_maturity)

	with reversion.create_revision():
		reversion.set_comment('Merge duplicitnich Resitelu: %r <- %r' % (rbase.pk, rmerge.pk))

		merge_props(rbase, rmerge, 'skola', pretend=pretend)
		merge_props(rbase, rmerge, 'datum_narozeni', pretend=pretend)
		merge_props(rbase, rmerge, 'datum_prihlaseni', pretend=pretend)
		merge_props(rbase, rmerge, 'datum_souhlasu_zasilani', pretend=pretend, smaller=True, equal=False)
		merge_props(rbase, rmerge, 'datum_souhlasu_udaje', pretend=pretend, smaller=True, equal=False)
		merge_props(rbase, rmerge, 'email', pretend=pretend)
		if rmerge.import_mamoper_id and not pretend:
			rbase.import_mamoper_id += ' ' + rmerge.import_mamoper_id
		if rmerge.poznamka and not pretend:
			rbase.poznamka += ' ' + rmerge.poznamka
		merge_props(rbase, rmerge, 'mesto', pretend=pretend)
		merge_props(rbase, rmerge, 'pohlavi_muz', pretend=pretend)
		merge_props(rbase, rmerge, 'psc', pretend=pretend)
		merge_props(rbase, rmerge, 'stat', pretend=pretend)
		merge_props(rbase, rmerge, 'telefon', pretend=pretend)
		merge_props(rbase, rmerge, 'ulice', pretend=pretend)
		merge_props(rbase, rmerge, 'zasilat', pretend=pretend)

		for res in rmerge.reseni.all():
			if not pretend:
				res.resitel = rbase
				res.save()

		for uc in rmerge.soustredeni_ucastnici_set.all():
			if not pretend:
				uc.resitel = rbase
				uc.save()

		if not pretend:
			rmerge.delete()
			rbase.save()