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"""

Text Justification

Given an array of words and a max width, format the text such that each line

has exactly max_width characters and is fully justified. Extra spaces are

distributed as evenly as possible with left slots getting more.

Reference: https://leetcode.com/problems/text-justification/

Complexity:

Time: O(n) where n is the total number of characters

Space: O(n)

"""

from __future__ import annotations

def text_justification(words: list[str], max_width: int) -> list[str]:

"""Justify text to a fixed width with evenly distributed spaces.

Args:

words: A list of words to justify.

max_width: The maximum width of each line.

Returns:

A list of fully justified strings.

Raises:

ValueError: If any word is longer than max_width.

Examples:

>>> text_justification(["What", "must", "be"], 16)

['What must be ']

"""

result: list[str] = []

row_length = 0

row_words: list[str] = []

index = 0

is_first_word = True

while index < len(words):

while row_length <= max_width and index < len(words):

if len(words[index]) > max_width:

raise ValueError(

"there exists word whose length is larger than max_width"

)

tentative_length = row_length

row_words.append(words[index])

tentative_length += len(words[index])

if not is_first_word:

tentative_length += 1

if tentative_length > max_width:

row_words.pop()

break

row_length = tentative_length

index += 1

is_first_word = False

row = ""

if index == len(words):

for word in row_words:

row += word + " "

row = row[:-1]

row += " " * (max_width - len(row))

elif len(row_words) != 1:

extra_spaces = max_width - row_length

spaces_per_gap = extra_spaces // (len(row_words) - 1)

remaining_spaces = extra_spaces - spaces_per_gap * (len(row_words) - 1)

for word_index in range(len(row_words)):

row += row_words[word_index]

if word_index != len(row_words) - 1:

row += " " * (1 + spaces_per_gap)

if remaining_spaces > 0:

row += " "

remaining_spaces -= 1

else:

row += row_words[0]

row += " " * (max_width - len(row))

result.append(row)

row_length = 0

row_words = []

is_first_word = True

return result

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