#!/usr/bin/python3

import psycopg2
import psycopg2.extras

OLD_DB = "mam_old"
NEW_DB = "mamweb"

oldconn = psycopg2.connect(f"dbname={OLD_DB}")
newconn = psycopg2.connect(f"dbname={NEW_DB}")

oldcur = oldconn.cursor(cursor_factory=psycopg2.extras.DictCursor)
newcur = newconn.cursor(cursor_factory=psycopg2.extras.DictCursor)


# Uses global variables oldcur, newcur!
def execute_simple(old_query, new_query=None):
	if new_query is None:
		new_query = old_query

	oldcur.execute(old_query)
	newcur.execute(new_query)

	if oldcur.rowcount != newcur.rowcount:
		raise ValueError(f"Queries '{old_query}' and '{new_query}' returned different number of rows ({oldcur.rowcount} and {newcur.rowcount})")

	return(oldcur.fetchall(), newcur.fetchall())

def check_same(old_row, new_row, old_fields, new_fields=None):
	if type(old_fields) != list:
		old_fields = [old_fields]

	if new_fields is None:
		new_fields = old_fields
	
	fields = zip(old_fields, new_fields)

	for old_field, new_field in fields:
		if old_row[old_field] == new_row[new_field]:
			continue
		raise ValueError(f"Fields '{old_field}' and '{new_field}' differs for rows '{old_row}' and '{new_row}'")
	return True



def check_skola():
	old_query = "SELECT * FROM seminar_skoly ORDER BY id"
	new_query = old_query

	old_res, new_res = execute_simple(old_query,new_query)

	res = zip(old_res,new_res)

	for o,n in res:
		check_same(o,n,['id','aesop_id','izo','nazev','kratky_nazev','ulice','mesto','psc','stat','je_zs','je_ss','poznamka'])

def check_resitel():
	old_query = 'SELECT * FROM seminar_resitele ORDER BY id'
	new_query = 'SELECT * FROM seminar_resitele JOIN seminar_osoby ON seminar_resitele.osoba_id = seminar_osoby.id ORDER BY seminar_resitele.id'

	old_res, new_res = execute_simple(old_query,new_query)

	res = zip(old_res,new_res)
	
	fields_osoba = [
		'jmeno',
		'prijmeni',
		'user',
		'pohlavi_muz',
		'email',
		'telefon',
		'datum_narozeni',
		'datum_souhlasu_udaje',
		'datum_souhlasu_zasilani',
		'datum_prihlaseni',
		'ulice',
		'mesto',
		'psc',
		'stat',
	]
	fields_keep = [
		'id',
		'skola_id',
		'rok_maturity',
		'zasilat',
		'poznamka',
	]
	fields_old = fields_keep+fields_osoba
	fields_new = fields_keep + ['seminar_osoby.'+f for f in fields_osoba]
	for o,n in res:
		check_same(o,n,fields_old, fields_new)

def check_reseni():
	old_query = 'SELECT * FROM seminar_reseni ORDER BY id'
	new_query = 'SELECT * FROM seminar_reseni JOIN seminar_hodnoceni AS hodnoceni ON hodnoceni_id = hodnoceni.id ORDER BY id'

	same_fields = ['id', 'forma', 'poznamka']
	renamed_fields = [('timestamp', 'cas_doruceni'),
		# Also moved fields
		('problem_id', 'hodnoceni.problem_id'),
		('body', 'hodnoceni.body'),
		('cislo_body_id', 'hodnoceni.cislo_body_id'),
		]
	old_fields = same_fields + [f[0] for f in renamed_fields]
	new_fields = same_fields + [f[1] for f in renamed_fields]

	old_res, new_res = execute_simple(old_query,new_query)

	res = zip(old_res,new_res)

	for o,n in res:
		check_same(o,n,old_fields, new_fields)

	# Řešitelé jsou nově m2m, takže je musíme dohledat
	old_query = 'SELECT id, resitel_id FROM seminar_reseni ORDER BY id'
	new_query = 'SELECT reseni_id, resitel_id FROM seminar_reseni_resitele ORDER BY reseni_id'

	oldcur = oldconn.cursor()
	old_results = oldcur.execute(old_query).fetchall()
	newcur = newconn.cursor()
	new_results = newcur.execute(old_query).fetchall()

	for oldr in old_results:
		if oldr not in new_results:
			raise ValueError(f'Pair {oldr} not found in new db.')

def check_organizator():
	old_query = 'SELECT * FROM seminar_organizatori ORDER BY id'
	new_query = 'SELECT * FROM seminar_organizatori JOIN seminar_osoby AS osoba ON osoba_id = osoba.id JOIN auth_user AS user ON osoba.user_id = user.id ORDER BY id'

	same_fields = ['studuje', 'strucny_popis_organizatora']
	renamed_fields = [
		('user_id', 'user.id'),
		('prezdivka', 'osoba.prezdivka'),
		('foto', 'osoba.foto'),
		('foto_male', 'osoba.foto_male'),
		]
	old_fields = same_fields + [f[0] for f in renamed_fields]
	new_fields = same_fields + [f[1] for f in renamed_fields]

	old_res, new_res = execute_simple(old_query,new_query)
	res = zip(old_res, new_res)
	for o,n in res:
		check_same(o,n,old_fields, new_fields)
		# organizuje od, do:
		if o.organizuje_od_roku != n.organizuje_od.year:
			raise ValueError(f'Not matching organizuje_od for org id={o.id}: old {o.organizuje_od_roku}, new {n.organizuje_od}')
		if o.organizuje_do_roku != n.organizuje_do.year:
			raise ValueError(f'Not matching organizuje_do for org id={o.id}: old {o.organizuje_do_roku}, new {n.organizuje_do}')



check_skola()
check_resitel()
check_reseni()
check_organizator()