#!/usr/bin/python3

from random import randint, random, choice


greeting = """
Englisch version below.

Hallo,

Sie hatten ja um eine Liste der aktuell exmatrikulationsgefährdeten Studierenden gebeten.
In der Datenbank sind zwei auf die weiteren Kriterien treffende Studierende zu finden,
leider gibt es aber noch einen großen Bestand an nicht korrekt eingepflegten Prüfungsakten,
die wir Ihnen zwar digital, aber nicht in einem einheitlichen Format zur Verfügung stellen können.
Vielleicht können Sie den ja mit regulären Ausdrücken filtern.

Viel Spaß

=== ENGLISCH VERSION ===
Hi, we have two students matching the criteria from the database and a certain amount of unstructured data.
Maybe you can filter it with regular expressions? Good luck.
"""

def matriculation_number():
	return randint(40_000_000, 55_000_000)
# fünf Tatverdächtige
# Uhrzeiten, siehe Infos von Verantwortlichen
# Groß-Klein-Schreibung

class Choice:
	def __init__(self, **data):
		""" stores a dict.
		the keys are strings that indicate the next state,
		the values are lists that store the possible emissions in transition to that new state.
		"""
		self.data = data
		self.new_states = list(self.data.keys())

	def choose(self):
		new_state = choice(self.new_states)
		emission = choice(self.data[new_state])
		return new_state, emission

class SingleArgChoice:
	def __init__(self, kwarg):
		if len(kwarg) != 1:
			raise ValueError(
				f"{self.__class__.__name__} takes exactly one keyword argument!"
			)
		for self.next_state, self.value in kwarg.items():
			pass

class RandInt(SingleArgChoice):
	def __init__(self, **kwarg):
		super().__init__(kwarg)
		assert len(self.value) == 2
		assert type(self.value[0]) == int
		assert type(self.value[1]) == int

		self.minimum = self.value[0]
		self.maximum = self.value[1]

	def choose(self):
		number = randint(self.minimum, self.maximum)
		return self.next_state, f"{number} "

class FixedText(SingleArgChoice):
	def __init__(self, **kwarg):
		super().__init__(kwarg)
		self.text = self.value

	def choose(self):
		return self.next_state, self.text

class Network:
	def __init__(self, **choices):
		""" takes a dict,
		the keys are strings that name states,
		the values are the choices for new states and emissions possible in these states.
		the 'start' state and the 'stop' state have their respective special roles.
		"""
		self.choices = choices
		self.recursion_warning = 100

	def choose(self):
		state = 'start'
		emissions = []
		states = [state]
		while state != 'stop':
			state, emission = self.choices[state].choose()
			emissions.append(emission)
			states.append(states)
			if len(emissions) > self.recursion_warning:
				raise RecursionError(
					"there are over a hundred emissions. probably a bug!"
				)

		return emissions, states

network = Network(
	start = Choice(
		student = ["Student ", "Studentin ", "", "Studierende:r "],
		matr_nr = [""],
	),
	student = Choice(
		last_name = ["Anna ", "Anton ", "Amal "],
	),
	last_name = Choice(
		student_mit = ["Beier ", "Behar ", "Berger "],
	),
	student_mit = Choice(
		matr_nr = ["mit "],
	),
	matr_nr = Choice(
		matr_number = ["Matrikelnummer "],
	),
	matr_number = RandInt(
		hat_den = [
			40_000_000,
			55_000_000,
		]
	),
	hat_den = FixedText(
		versuch = "hat den "
	),
	versuch = Choice(
		nicht = ["Erstversuch ", "1. Versuch ", "Zweitversuch ", "2. Versuch "],
	),
	nicht = Choice(
		bestanden = ["nicht ", ""],
	),
	bestanden = FixedText(
		stop = "bestanden."
	),
)


if __name__ == "__main__":
	for __ in range(200):
		emissions, _ = network.choose()
		line = ''.join(emissions)
		print(line)