# Authors: see git history
#
# Copyright (c) 2022 Authors
# Licensed under the GNU GPL version 3.0 or later.  See the file LICENSE for details.

from copy import deepcopy
from os import path

from inkex import NSS, Style, load_svg
from shapely import geometry as shgeo

from .svg.tags import EMBROIDERABLE_TAGS
from .utils import cache, get_bundled_dir

MARKER = ['pattern', 'guide-line']


def ensure_marker(svg, marker):
    marker_path = ".//*[@id='inkstitch-%s-marker']" % marker
    if svg.defs.find(marker_path) is None:
        svg.defs.append(deepcopy(_marker_svg().defs.find(marker_path)))


@cache
def _marker_svg():
    marker_path = path.join(get_bundled_dir("symbols"), "marker.svg")
    with open(marker_path) as marker_file:
        return load_svg(marker_file).getroot()


def set_marker(node, position, marker):
    ensure_marker(node.getroottree().getroot(), marker)

    # attach marker to node
    style = node.style
    style += Style(f'marker-{ position }:url(#inkstitch-{ marker }-marker)')
    node.set('style', style)


def get_marker_elements(node, marker, get_fills=True, get_strokes=True, get_satins=False):
    from .elements import EmbroideryElement
    from .elements.fill_stitch import FillStitch
    from .elements.satin_column import SatinColumn
    from .elements.stroke import Stroke

    fills = []
    strokes = []
    satins = []
    # do not close marker-start:url(
    # if the marker group has been copied and pasted in Inkscape it may have been duplicated with an updated id (e.g. -4)
    xpath = "./parent::svg:g/*[contains(@style, 'marker-start:url(#inkstitch-%s-marker')]" % marker
    markers = node.xpath(xpath, namespaces=NSS)
    for marker in markers:
        if marker.tag not in EMBROIDERABLE_TAGS:
            continue

        element = EmbroideryElement(marker)
        fill = element.get_style('fill')
        stroke = element.get_style('stroke')

        if get_fills and fill is not None:
            fill = FillStitch(marker).shape
            fills.append(fill)

        if get_strokes and stroke is not None:
            stroke = Stroke(marker).paths
            line_strings = [shgeo.LineString(path) for path in stroke]
            strokes.append(shgeo.MultiLineString(line_strings))

        if get_satins and stroke is not None:
            satin = SatinColumn(marker)
            if len(satin.rails) == 2:
                satins.append(satin)

    return {'fill': fills, 'stroke': strokes, 'satin': satins}


def get_marker_elements_cache_key_data(node, marker):
    marker_elements = get_marker_elements(node, marker, True, True, True)

    marker_elements['fill'] = [shape.wkt for shape in marker_elements['fill']]
    marker_elements['stroke'] = [shape.wkt for shape in marker_elements['stroke']]
    marker_elements['satin'] = [satin.csp for satin in marker_elements['satin']]

    return marker_elements


def has_marker(node, marker=list()):
    if not marker:
        marker = MARKER
    for m in marker:
        style = node.get('style') or ''
        if "marker-start:url(#inkstitch-%s-marker" % m in style:
            return True
    return False