"""
Röntgen entry point.

Author: Sergey Vartanov (me@enzet.ru).
"""
import argparse
import os
import sys
from pathlib import Path
from typing import List

import numpy as np
import svgwrite

from roentgen.constructor import Constructor
from roentgen.flinger import Flinger
from roentgen.grid import IconCollection
from roentgen.icon import ShapeExtractor
from roentgen.mapper import (
    AUTHOR_MODE, CREATION_TIME_MODE, ICONS_FILE_NAME, Painter, TAGS_FILE_NAME,
    check_level_number, check_level_overground
)
from roentgen.osm_getter import get_osm
from roentgen.osm_reader import Map, OSMReader, OverpassReader
from roentgen.point import Point
from roentgen.scheme import LineStyle, Scheme
from roentgen.ui import error, parse_options
from roentgen.util import MinMax


def main(argv) -> None:
    """
    Röntgen entry point.

    :param argv: command-line arguments
    """
    options: argparse.Namespace = parse_options(argv)

    if not options:
        sys.exit(1)

    input_file_names: List[Path]

    if options.input_file_name:
        input_file_names = list(map(Path, options.input_file_name))
    else:
        content = get_osm(options.boundary_box)
        if not content:
            error("cannot download OSM data")
        input_file_names = ["map" / Path(options.boundary_box + ".osm")]

    scheme: Scheme = Scheme(Path(TAGS_FILE_NAME))
    min_: np.array
    max_: np.array
    map_: Map

    if input_file_names[0].name.endswith(".json"):
        reader: OverpassReader = OverpassReader()
        reader.parse_json_file(input_file_names[0])

        map_ = reader.map_
        min_ = np.array((map_.boundary_box[0].min_, map_.boundary_box[1].min_))
        max_ = np.array((map_.boundary_box[0].max_, map_.boundary_box[1].max_))
    else:
        boundary_box: List[float] = list(
            map(float, options.boundary_box.split(','))
        )
        is_full: bool = options.mode in [AUTHOR_MODE, CREATION_TIME_MODE]
        osm_reader = OSMReader(is_full=is_full)

        for file_name in input_file_names:
            if not file_name.is_file():
                print(f"Fatal: no such file: {file_name}.")
                sys.exit(1)

            osm_reader.parse_osm_file(file_name)

        map_ = osm_reader.map_
        min_ = np.array((boundary_box[1], boundary_box[0]))
        max_ = np.array((boundary_box[3], boundary_box[2]))

    flinger: Flinger = Flinger(MinMax(min_, max_), options.scale)
    size: np.array = flinger.size

    svg: svgwrite.Drawing = svgwrite.Drawing(
        options.output_file_name, size=size
    )
    icon_extractor: ShapeExtractor = ShapeExtractor(
        Path(ICONS_FILE_NAME), Path("icons/config.json")
    )

    def check_level(x) -> bool:
        """ Draw objects on all levels. """
        return True

    if options.level:
        if options.level == "overground":
            check_level = check_level_overground
        elif options.level == "underground":
            def check_level(x) -> bool:
                """ Draw underground objects. """
                return not check_level_overground(x)
        else:
            def check_level(x) -> bool:
                """ Draw objects on the specified level. """
                return not check_level_number(x, float(options.level))

    constructor: Constructor = Constructor(
        map_, flinger, scheme, icon_extractor, check_level, options.mode,
        options.seed)
    constructor.construct()

    painter: Painter = Painter(
        show_missing_tags=options.show_missing_tags, overlap=options.overlap,
        mode=options.mode, label_mode=options.label_mode,
        map_=map_, flinger=flinger, svg=svg, icon_extractor=icon_extractor,
        scheme=scheme)

    painter.draw(constructor)

    print("Writing output SVG...")
    with open(options.output_file_name, "w") as output_file:
        svg.write(output_file)


def draw_element(target: str, tags_description: str):
    """
    Draw single node, line, or area.

    :param target: node, line, or area.
    :param tags_description: text description of tags, pair are separated by
        comma, key from value is separated by equals sign.
    """
    tags = dict([x.split("=") for x in tags_description.split(",")])
    scheme: Scheme = Scheme(Path("scheme/default.yml"))
    extractor: ShapeExtractor = ShapeExtractor(
        Path("icons/icons.svg"), Path("icons/config.json")
    )
    icon, priority = scheme.get_icon(extractor, tags)
    is_for_node: bool = target == "node"
    labels = scheme.construct_text(tags, "all")
    point = Point(
        icon, labels, tags, np.array((32, 32)), None, is_for_node=is_for_node,
        draw_outline=is_for_node
    )
    border: np.array = np.array((16, 16))
    size: np.array = point.get_size() + border
    point.point = np.array((size[0] / 2, 16 / 2 + border[1] / 2))
    svg = svgwrite.Drawing("test_icon.svg", size.astype(float))
    for style in scheme.get_style(tags, 18):
        style: LineStyle
        path = svg.path(d="M 0,0 L 64,0 L 64,64 L 0,64 L 0,0 Z")
        path.update(style.style)
        svg.add(path)
    point.draw_main_shapes(svg)
    point.draw_extra_shapes(svg)
    point.draw_texts(svg)
    svg.write(open("test_icon.svg", "w+"))


def draw_icons() -> None:
    """
    Draw all possible icon shapes combinations as grid in one SVG file and as
    individual SVG files.
    """
    os.makedirs("icon_set", exist_ok=True)
    scheme: Scheme = Scheme(Path("scheme/default.yml"))
    extractor: ShapeExtractor = ShapeExtractor(
        Path("icons/icons.svg"), Path("icons/config.json")
    )
    collection: IconCollection = IconCollection.from_scheme(scheme, extractor)
    collection.draw_grid(Path("icon_grid.svg"))
    collection.draw_icons(Path("icon_set"))


if __name__ == "__main__":
    if len(sys.argv) == 3 and sys.argv[1] in ["node", "way", "area"]:
        draw_element(sys.argv[1], sys.argv[2])
    elif len(sys.argv) == 2 and sys.argv[1] == "icons":
        draw_icons()
    else:
        main(sys.argv)