import random, json, requests, string, sys

def game():
    chain = 0
    usedWords = []
    answer_Word = None
    chainGood = True
    min_length = 3
    while chainGood:
        # if chain != 0 and chain % 5 == 0: min_length += 1
        if answer_Word != None:
            last_letter = answer_Word[-1:]
        else:
            last_letter = rand_letter

        turn = playersNames[((chain+1)%numPlayers)-1]
        print('\n> %s\'s turn' % turn)

        rand_word = random.choice(wordTypes)
        article = 'an' if rand_word == 'adjective' else 'a'
        answer_Word = input('Enter {} {} (of length > {}) beginning with the letter "{}": '.format(article, rand_word, min_length, last_letter)).lower()

        url = 'https://api.wordnik.com/v4/word.json/' + answer_Word + '/definitions?limit=200&includeRelated=false&useCanonical=false&includeTags=false&api_key=<--- Wordnik API Key --->'
        response = json.loads(requests.get(url).text)
        correct_type = response[0]['partOfSpeech'] if len(response) > 0 else ''
    
        if answer_Word.isalpha() == True and answer_Word.startswith(last_letter) and answer_Word not in usedWords and len(answer_Word) >= min_length and rand_word in correct_type:
            print ("Good job {}!".format(turn))
            usedWords.append(answer_Word)
            chain += 1
            # print(' - Definition: ' + response[0]['text'])
            print("The chain is now {} link long!".format(chain) if chain == 1 else "The chain is now {} links long!".format(chain))
        else :
            print('\n' + '-' * 50 + '\nWord chain broken! Why?')
            if answer_Word.isalpha() == False: print(' - Only alphabets were allowed!')
            elif answer_Word.startswith(last_letter) == False: print(' - "{}" does not start with "{}"'.format(answer_Word, last_letter))
            elif answer_Word in usedWords: print(' - "{}" is already used'.format(answer_Word))
            elif len(answer_Word) < min_length: print(' - Minimum word length requirement: {} (Word length of "{}" is {})'.format(min_length, answer_Word, len(answer_Word)))
            elif rand_word != correct_type:
                if correct_type == '': print(' - "{}" is not a genuine word!'.format(answer_Word))
                else:
                    c_article = 'an' if correct_type == 'adjective' else 'a'
                    print(' - "{}" is {} {}, not {} {}'.format(answer_Word, c_article, correct_type, article, rand_word))
            chainGood = False
    again = input(('\n' + '-' * 50 + '\nStart again? [y/n]: ')).strip()
    if again.lower().startswith('y'): game()
    else:
        print('Thank you for playing WordChain, Goodbye!')
        sys.exit()

wordTypes = ['noun', 'adjective', 'verb']
playersNames = []

print('-' * 50)
print(' ' * 10 + 'Welcome to WordChain!')
print('-' * 50)
numPlayers = 0
while True:
    try:
        numPlayers = int(input('How many players (minimum of 2) ? : '))
        if numPlayers < 2:
            print('value must be a positive integer > 2')
            continue
        break
    except ValueError:
        print(" value must be a positive integer equal or greater then 2")

count = 1

while count <= numPlayers:
	playersname = input('{} {} {}'.format('Enter name of player', count , ': '))
	if playersname.isalpha() == False:
		print("enter valid characters from A-Z and a-z")
	elif playersname in playersNames :
		print("name already exists enter different name")
	else:
		playersNames.append(playersname)
		count +=1

rand_letter = random.choice("abcdefghijklmnopqrstuvwxyz")
game()