from funcy import identity, compose, first, juxt, rest, rcompose

from cv_analysis.utils import star, rconj
from synthesis.random import rnd
from synthesis.text.line_formatter.line_formatter import LineFormatter


class ParagraphLineFormatter(LineFormatter):
    def __init__(self, blank_line_percentage=None):
        self.blank_line_percentage = blank_line_percentage or rnd.uniform(0, 0.5)

    def __call__(self, lines, last_full):
        return self.format_lines(lines, last_full)

    def format_lines(self, lines, last_full):
        def truncate_current_line():
            return rnd.random() < self.blank_line_percentage and last_full

        # This is meant to be read from the bottom up.
        current_line_shall_not_be_a_full_line = truncate_current_line()
        line_formatter = self.truncate_line if current_line_shall_not_be_a_full_line else identity
        format_current_line = compose(line_formatter, first)
        move_current_line_to_back = star(rconj)
        split_first_line_from_lines_and_format_the_former = juxt(rest, format_current_line)
        split_off_current_line_then_format_it_then_move_it_to_the_back = rcompose(
            split_first_line_from_lines_and_format_the_former,
            move_current_line_to_back,
        )
        current_line_is_a_full_line = not current_line_shall_not_be_a_full_line
        # Start reading here and move up.
        return split_off_current_line_then_format_it_then_move_it_to_the_back(lines), current_line_is_a_full_line

    def format_line(self, line, full=True):
        line = self.truncate_line(line) if not full else line
        return line, full

    def truncate_line(self, line: str):
        n_trailing_words = rnd.randint(0, 4)
        line = " ".join(line.split()[-n_trailing_words - 1 : -1]).replace(".", "")
        line = line + ".\n" if line else line
        return line