class_name Random

const MIN_WORD_LEN = 4
const MAX_WORD_LEN = 8

const VOWEL = ["a","e","i","o","u","y"]
const CONSONANTS = ["b", "c", "d", "f", "g", "h", "j", "k", "l", "m", "n", "p", "q", "r", "s", "t", "v", "w", "x", "z"]


static func generate_random_word(_random_seed = randi()) -> String:
    var word_len = randf_range(4,8)
    var word = ''
    var last_letter_is_vowel = false

    for i in range(word_len):
        if last_letter_is_vowel:
            word += CONSONANTS.pick_random()
        else:
            word += VOWEL.pick_random()
        
        last_letter_is_vowel = not last_letter_is_vowel
    return word.capitalize()

static func mutate_word(word : String) -> String:
    var rand_int = randi()

    if len(word) > MIN_WORD_LEN and rand_int % 3 == 0:
        return shorten_word(word)
    elif len(word) < MAX_WORD_LEN and rand_int % 3 == 1:
        return elongate_word(word)
    
    return replace_character(word)
    

static func shorten_word(word : String):
    if randi()%2 == 0:
        return word.left(len(word) - 1).capitalize()
    else :
        return word.right(len(word) - 1).capitalize()

static func elongate_word(word : String):
    if randi()%2 == 0:
        var letter = CONSONANTS.pick_random() if word.left(1) in VOWEL else VOWEL.pick_random() 
        return (letter + word).capitalize()
    else :
        var letter = CONSONANTS.pick_random() if word.right(1) in VOWEL else VOWEL.pick_random() 
        return (word + letter).capitalize()

static func replace_character(word : String):
    var character_id = randi_range(0, len(word))
    var character = word[character_id]

    if character in VOWEL:
        character = VOWEL.pick_random()
    else:
        character = CONSONANTS.pick_random()

    word[character_id] = character
    return word