import sys
import csv
import os

from numpy import append

DIR = os.path.dirname(__file__)
alfabet = "abcdefghijklmnopqrstuvwxyz "


def join_path(filename: str) -> str:
    return os.path.join(DIR, filename)


if len(sys.argv) == 1:
    print("Default arguments parsed\n")
    sys.argv.append("fsa_description.arg")
    sys.argv.append("shakespeare_ascii_lower.in")
    sys.argv.append("shakespeare_ascii_lower.exp")

with open(join_path(sys.argv[1]), "r", newline="", encoding="utf8") as csvfile:
    filereader = csv.reader(csvfile, delimiter="\t", quotechar="|")
    fsa_description = list(filereader)
    accepting_state = int(fsa_description[-1][0])
    fsa_description = fsa_description[:-1]
    fsa_description_map = {}
    is_error = False
    for num, item in enumerate(fsa_description):
        for letter in item[2]:
            if letter not in alfabet:
                print("ERROR - letter not in alfabet: ", letter, "| line:", num + 1)
                exit(-1)
            if (int(item[0]), letter) in fsa_description_map:
                print("ERROR - duplicate letter:", letter, "| line:", num + 1)
                is_error = True
            tuple = (int(item[0]), letter)
            fsa_description_map[tuple] = int(item[1])

    if is_error:
        exit(-1)

states = {}
for item in fsa_description_map:
    states[item[0]] = states[item[0]] + item[1] if item[0] in states else item[1]


from collections import Counter


# check if all letters are used once
def is_permutation(str1, str2):
    return Counter(str1) == Counter(str2)


def find_missing_letters(str1, str2) -> str:
    missing_letters = ""
    for char in str2:
        if char not in str1:
            missing_letters += char
    return missing_letters


for state in states:
    if not is_permutation(states[state], alfabet):
        print(
            f"ERROR - state {state} doesn't match: {states[state]} | {alfabet} | diff - {find_missing_letters(states[state], alfabet)}"
        )
        exit(-1)


with open(join_path(sys.argv[2]), "r", newline="", encoding="utf8") as csvfile:
    filereader = csv.reader(csvfile, delimiter="\t", quotechar="|")
    test_in = list(filereader)

with open(join_path(sys.argv[3]), "r", newline="", encoding="utf8") as csvfile:
    filereader = csv.reader(csvfile, delimiter="\t", quotechar="|")
    test_out = list(filereader)


is_difference = []
for i, word in enumerate(test_in):
    current_state = 0
    if len(word) != 0:
        for letter in word[0]:
            current_state = fsa_description_map[(current_state, letter)]

    print(str(i + 1) + "\t", end="")
    if current_state == accepting_state:
        print("YES\t", end="")
        if "YES" != test_out[i][0]:
            print("ERROR", word, end="")
            is_difference.append(i)
    else:
        print("NO\t", end="")
        if "NO" != test_out[i][0]:
            print("ERROR", word, end="")
            is_difference.append(i)
    print()

if len(is_difference) != 0:
    print(is_difference)