cv-analysis-service/synthesis/segment/table/table.py

import random
from copy import deepcopy
from enum import Enum
from functools import lru_cache, partial
from math import sqrt
from typing import List, Iterable

from PIL import Image
from funcy import chunks, mapcat, repeatedly
from loguru import logger

from cv_analysis.utils.geometric import is_square_like
from cv_analysis.utils.image_operations import superimpose

from cv_analysis.utils.rectangle import Rectangle
from cv_analysis.utils.spacial import area
from synthesis.random import rnd, possibly
from synthesis.segment.content_rectangle import ContentRectangle
from synthesis.segment.plot import pick_colormap
from synthesis.segment.random_content_rectangle import RandomContentRectangle
from synthesis.segment.segments import generate_random_plot, generate_recursive_random_table, generate_text_block
from synthesis.segment.table.cell import Cell
from synthesis.text.text import generate_random_words, generate_random_number


class RecursiveRandomTable(RandomContentRectangle):
    def __init__(self, x1, y1, x2, y2, border_width=1, layout: str = None, double_rule=False):
        """A table with a random number of rows and columns, and random content in each cell.

        Args:
            x1: x-coordinate of the top-left corner
            y1: y-coordinate of the top-left corner
            x2: x-coordinate of the bottom-right corner
            y2: y-coordinate of the bottom-right corner
            border_width: width of the table border
            layout: layout of the table, either "horizontal", "vertical", "closed", or "open"
            double_rule: whether to use double rules as the top and bottom rules
        """

        assert layout in [None, "horizontal", "vertical", "closed", "open"]

        super().__init__(x1, y1, x2, y2)

        self.double_rule = double_rule
        self.double_rule_width = (3 * border_width) if self.double_rule else 0

        self.n_columns = rnd.randint(1, max(self.width // 100, 1))
        self.n_rows = rnd.randint(1, max((self.height - 2 * self.double_rule_width) // rnd.randint(17, 100), 1))
        self.cell_size = (self.width / self.n_columns, (self.height - 2 * self.double_rule_width) / self.n_rows)

        self.content = Image.new("RGBA", (self.width, self.height), (255, 255, 255, 0))

        self.background_color = get_random_background_color()

        self.layout = layout or self.pick_random_layout()
        logger.debug(f"Layout: {self.layout}")

    def pick_random_layout(self):

        if self.n_columns == 1 and self.n_rows == 1:
            layout = "closed"
        elif self.n_columns == 1:
            layout = rnd.choice(["vertical", "closed"])
        elif self.n_rows == 1:
            layout = rnd.choice(["horizontal", "closed"])
        else:
            layout = rnd.choice(["closed", "horizontal", "vertical", "open"])

        return layout

    def generate_random_table(self):
        cells = self.generate_table()
        cells = list(self.fill_cells_with_content(cells))
        # FIXME: There is a bug here: Table rule is not drawn correctly, actually we want to do cells = ...
        list(self.draw_cell_borders(cells))

        self.content = paste_contents(self.content, cells)
        assert self.content.mode == "RGBA"

    def fill_cells_with_content(self, cells):
        yield from map(self.build_cell, cells)

    def build_cell(self, cell):

        if self.__is_a_small_cell(cell):
            cell = self.build_small_cell(cell)

        elif self.__is_a_medium_sized_cell(cell):
            cell = self.build_medium_sized_cell(cell)

        elif self.__is_a_large_cell(cell):
            cell = self.build_large_cell(cell)

        else:
            raise ValueError(f"Invalid cell size: {get_size(cell)}")

        assert cell.content.mode == "RGBA"

        return cell

    def __is_a_small_cell(self, cell):
        return get_size(cell) <= Size.SMALL.value

    def __is_a_medium_sized_cell(self, cell):
        return get_size(cell) <= Size.MEDIUM.value

    def __is_a_large_cell(self, cell):
        return get_size(cell) > Size.MEDIUM.value

    def build_small_cell(self, cell):

        content = (possibly() and generate_random_words(1, 3)) or (
            generate_random_number()
            + ((possibly() and " " + rnd.choice(["$", "£", "%", "EUR", "USD", "CAD", "ADA"])) or "")
        )

        return generate_text_block(cell, content)

    def build_medium_sized_cell(self, cell):

        choice = rnd.choice(["plot", "recurse"])

        if choice == "plot":
            return generate_random_plot(cell)

        elif choice == "recurse":
            return generate_recursive_random_table(
                cell,
                border_width=1,
                layout=random.choice(["open", "horizontal", "vertical"]),
                double_rule=False,
            )

        else:
            return generate_text_block(cell, f"{choice} {get_size(cell):.0f} {get_size_class(cell).name}")

    def build_large_cell(self, cell):
        choice = rnd.choice(["plot", "recurse"])

        logger.debug(f"Generating {choice} {get_size(cell):.0f} {get_size_class(cell).name}")

        if choice == "plot" and is_square_like(cell):
            return generate_random_plot(cell)

        else:
            logger.debug(f"recurse {get_size(cell):.0f} {get_size_class(cell).name}")
            return generate_recursive_random_table(
                cell,
                border_width=1,
                layout=random.choice(["open", "horizontal", "vertical"]),
                double_rule=False,
            )

    def draw_cell_borders(self, cells: List[ContentRectangle]):
        def draw_edges_based_on_position(cell: Cell, col_idx, row_index):
            # Draw the borders of the cell based on its position in the table
            if col_idx < self.n_columns - 1:
                cell.draw_right_border()

            if row_index < self.n_rows - 1:
                cell.draw_bottom_border()

        columns = chunks(self.n_rows, cells)
        for col_idx, column in enumerate(columns):
            for row_index, cell in enumerate(column):
                # TODO: Refactor
                c = Cell(*cell.coords, self.background_color)
                c.content = cell.content
                draw_edges_based_on_position(c, col_idx, row_index)
                yield cell

        if self.layout == "closed":
            # TODO: Refactor
            c = Cell(*self.coords, self.background_color)
            c.content = self.content
            c.draw()
            yield self

        # TODO: Refactor
        if self.double_rule:
            c1 = Cell(*self.coords)
            c1.draw_top_border(width=1)
            c1.draw_bottom_border(width=1)

            x1, y1, x2, y2 = self.coords
            c2 = Cell(x1, y1 + self.double_rule_width, x2, y2 - self.double_rule_width)
            c2.draw_top_border(width=1)
            c2.draw_bottom_border(width=1)

            c = superimpose(c1.content, c2.content)

            self.content = superimpose(c, self.content)

            yield self

    def generate_table(self) -> Iterable[ContentRectangle]:
        yield from mapcat(self.generate_column, range(self.n_columns))

    def generate_column(self, column_index) -> Iterable[ContentRectangle]:
        logger.trace(f"Generating column {column_index}.")
        generate_cell_for_row_index = partial(self.generate_cell, column_index)
        yield from map(generate_cell_for_row_index, range(self.n_rows))

    def generate_cell(self, column_index, row_index) -> ContentRectangle:
        w, h = self.cell_size
        x1, y1 = (column_index * w), (row_index * h) + self.double_rule_width
        x2, y2 = x1 + w, y1 + h
        logger.trace(f"Generating cell ({row_index}, {column_index}) at ({x1}, {y1}, {x2}, {y2}).")
        return Cell(x1, y1, x2, y2, self.background_color)

    def generate_column_names(self):
        column_names = repeatedly(self.generate_column_name, self.n_columns)
        return column_names

    def generate_column_name(self):
        column_name = generate_random_words(1, 3)
        return column_name


@lru_cache(maxsize=None)
def get_random_background_color():
    return tuple([*get_random_color_complementing_color_map(pick_colormap()), rnd.randint(100, 210)])


def get_random_color_complementing_color_map(colormap):
    def color_complement(r, g, b):
        """Reference: https://stackoverflow.com/a/40234924"""

        def hilo(a, b, c):
            if c < b:
                b, c = c, b
            if b < a:
                a, b = b, a
            if c < b:
                b, c = c, b
            return a + c

        k = hilo(r, g, b)
        return tuple(k - u for u in (r, g, b))

    color = colormap(0.2)[:3]
    color = [int(255 * v) for v in color]
    color = color_complement(*color)
    return color


def paste_contents(page, contents: Iterable[ContentRectangle]):
    page = deepcopy(page)
    for content in contents:
        paste_content(page, content)
    return page


def paste_content(page, content_box: ContentRectangle):
    assert content_box.content.mode == "RGBA"
    page.paste(content_box.content, (content_box.x1, content_box.y1), content_box.content)
    return page


def get_size_class(rectangle: Rectangle):
    size = get_size(rectangle)
    if size < Size.SMALL.value:
        return Size.SMALL
    elif size < Size.LARGE.value:
        return Size.MEDIUM
    else:
        return Size.LARGE


def get_size(rectangle: Rectangle):
    size = sqrt(area(rectangle))
    return size


class Size(Enum):
    # FIXME: this has to scale with the DPI
    SMALL = 120
    MEDIUM = 180
    LARGE = 300