"""
Icon grid drawing.

Author: Sergey Vartanov (me@enzet.ru).
"""
from os.path import join
from typing import Any, Dict, List, Set

import numpy as np
from colour import Color
from svgwrite import Drawing

from roentgen.icon import IconExtractor, Shape
from roentgen.scheme import Scheme


def draw_all_icons(
        output_file_name: str, output_directory: str, columns: int = 16,
        step: float = 24
    ) -> None:
    """
    Draw all possible icon combinations in grid.

    :param output_file_name: output SVG file name for icon grid
    :param output_directory: path to the directory to store individual SVG files
        for icons
    :param columns: the number of columns in grid
    :param step: horizontal and vertical distance between icons
    """
    tags_file_name: str = "data/tags.yml"
    scheme: Scheme = Scheme(tags_file_name)

    to_draw: List[Set[str]] = []

    for element in scheme.icons:  # type: Dict[str, Any]
        if "icon" in element and set(element["icon"]) not in to_draw:
            to_draw.append(set(element["icon"]))
        if "add_icon" in element and set(element["add_icon"]) not in to_draw:
            to_draw.append(set(element["add_icon"]))
        if "over_icon" not in element:
            continue
        if "under_icon" in element:
            for icon_id in element["under_icon"]:  # type: str
                current_set = set([icon_id] + element["over_icon"])
                if current_set not in to_draw:
                    to_draw.append(current_set)
        if not ("under_icon" in element and "with_icon" in element):
            continue
        for icon_id in element["under_icon"]:  # type: str
            for icon_2_id in element["with_icon"]:  # type: str
                current_set: Set[str] = set(
                    [icon_id] + [icon_2_id] + element["over_icon"])
                if current_set not in to_draw:
                    to_draw.append(current_set)
            for icon_2_id in element["with_icon"]:  # type: str
                for icon_3_id in element["with_icon"]:  # type: str
                    current_set = set(
                        [icon_id] + [icon_2_id] + [icon_3_id] +
                        element["over_icon"])
                    if (icon_2_id != icon_3_id and icon_2_id != icon_id and
                            icon_3_id != icon_id and
                            current_set not in to_draw):
                        to_draw.append(current_set)

    icons_file_name: str = "icons/icons.svg"
    extractor: IconExtractor = IconExtractor(icons_file_name)

    specified_ids: Set[str] = set()

    for icons_to_draw in to_draw:  # type: List[str]
        specified_ids |= icons_to_draw
    print(
        "Icons with no tag specification: \n    " +
        ", ".join(sorted(extractor.icons.keys() - specified_ids)) + "."
    )

    draw_grid(
        output_file_name, to_draw, extractor, output_directory, columns, step
    )


def draw_grid(
    file_name: str, combined_icon_ids: List[Set[str]],
    extractor: IconExtractor, output_directory: str, columns: int = 16,
    step: float = 24, color=Color("#444444")
) -> List[List[Shape]]:
    """
    Draw icons in the form of table

    :param file_name: output SVG file name
    :param combined_icon_ids: list of set of icon string identifiers
    :param extractor: icon extractor that generates icon SVG path commands using
        its string identifier
    :param output_directory: path to the directory to store individual SVG files
        for icons
    :param columns: number of columns in grid
    :param step: horizontal and vertical distance between icons in grid
    :param color: icon foreground color
    """
    point: np.array = np.array((step / 2, step / 2))
    width: float = step * columns
    number: int = 0
    icons: List[List[Shape]] = []

    for icons_to_draw in combined_icon_ids:  # type: Set[str]
        found: bool = False
        icon_set: List[Shape] = []
        names = []
        for icon_id in icons_to_draw:  # type: str
            icon, extracted = extractor.get_path(icon_id)  # type: Shape, bool
            assert extracted, f"no icon with ID {icon_id}"
            icon_set.append(icon)
            found = True
            if icon.name:
                names.append(icon.name)
        if found:
            icons.append(icon_set)
            number += 1
        draw_icon(
            join(output_directory, f"Röntgen {' + '.join(names)}.svg"),
            icons_to_draw, extractor
        )

    height: int = int(int(number / (width / step) + 1) * step)
    svg: Drawing = Drawing(file_name, (width, height))
    svg.add(svg.rect((0, 0), (width, height), fill="#FFFFFF"))

    for combined_icon in icons:  # type: List[Shape]
        background_color = "#FFFFFF"
        svg.add(svg.rect(
            point - np.array((-10, -10)), (20, 20),
            fill=background_color))
        for icon in combined_icon:  # type: Shape
            path = icon.get_path(svg, point)
            path.update({"fill": color.hex})
            svg.add(path)
        point += np.array((step, 0))
        if point[0] > width - 8:
            point[0] = step / 2
            point += np.array((0, step))
            height += step

    print(f"Icons: {number}.")

    with open(file_name, "w") as output_file:
        svg.write(output_file)

    return icons


def draw_icon(
        file_name: str, icon_ids: Set[str], extractor: IconExtractor
    ) -> None:

    icon_set: List[Shape] = []
    for icon_id in icon_ids:  # type: str
        icon, extracted = extractor.get_path(icon_id)  # type: Shape, bool
        assert extracted, f"no icon with ID {icon_id}"
        icon_set.append(icon)

    svg: Drawing = Drawing(file_name, (16, 16))

    for icon in icon_set:  # type: Shape
        path = icon.get_path(svg, (8, 8))
        path.update({"fill": "black"})
        svg.add(path)

    with open(file_name, "w") as output_file:
        svg.write(output_file)