# SPDX-License-Identifier: LGPL-2.1-or-later

# -*- coding: utf8 -*-
# ***************************************************************************
# *   Copyright (c) 2009 Yorik van Havre <yorik@uncreated.net>              *
# *   Copyright (c) 2018 George Shuklin (amarao)                            *
# *   Copyright (c) 2020 Eliud Cabrera Castillo <e.cabrera-castillo@tum.de> *
# *                                                                         *
# *   This program is free software; you can redistribute it and/or modify  *
# *   it under the terms of the GNU Lesser General Public License (LGPL)    *
# *   as published by the Free Software Foundation; either version 2 of     *
# *   the License, or (at your option) any later version.                   *
# *   for detail see the LICENCE text file.                                 *
# *                                                                         *
# *   This program is distributed in the hope that it will be useful,       *
# *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
# *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
# *   GNU Library General Public License for more details.                  *
# *                                                                         *
# *   You should have received a copy of the GNU Library General Public     *
# *   License along with this program; if not, write to the Free Software   *
# *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  *
# *   USA                                                                   *
# *                                                                         *
# ***************************************************************************
"""Provides functions to return the SVG representation of text elements."""
## @package svgtext
# \ingroup draftfunctions
# \brief Provides functions to return the SVG representation of text elements.

import math

import FreeCAD as App
import DraftVecUtils
import draftutils.utils as utils

## \addtogroup draftfunctions
# @{


def _get_text_techdraw(text, tcolor, fontsize, anchor, align, fontname, angle, base, linespacing):
    """Return the SVG representation of text for TechDraw display.

    `text` is a list of textual elements; they are iterated, styled,
    and added around a `<text>` tag.
    ::
        <text ...> text[0] </text>
        <text ...> text[1] </text>
    """
    svg = ""
    for i in range(len(text)):
        delta = App.Vector(0, -i * linespacing, 0)
        point = base + DraftVecUtils.rotate(delta, angle)

        _t = text[i].replace("&", "&amp;")
        _t = _t.replace("<", "&lt;")
        t = _t.replace(">", "&gt;")

        svg += "<text "
        svg += 'stroke-width="0" stroke="{}" '.format(tcolor)
        svg += 'fill="{}" font-size="{}" '.format(tcolor, fontsize)
        svg += 'style="text-anchor:{};text-align:{};'.format(anchor, align.lower())
        svg += 'font-family:{}" '.format(fontname)
        svg += 'transform="'
        svg += "rotate({},{},{}) ".format(math.degrees(angle), point.x, point.y)
        svg += "translate({},{}) ".format(point.x, point.y)
        svg += 'scale(1,-1)"'
        # svg += 'freecad:skip="1"'
        svg += ">\n"
        svg += t
        svg += "</text>\n"
    return svg


def _get_text_header(tcolor, fontsize, anchor, align, fontname, angle, base, flip):
    """Return the initial <text> tag with style options.

    The text must be added after this tag, and then must be closed.
    ::
        <text ...>
        ...
        </text>
    """
    svg = "<text "
    svg += 'stroke-width="0" stroke="{}" '.format(tcolor)
    svg += 'fill="{}" font-size="{}" '.format(tcolor, fontsize)
    svg += 'style="text-anchor:{};text-align:{};'.format(anchor, align.lower())
    svg += 'font-family:{}" '.format(fontname)
    svg += 'transform="'
    svg += "rotate({},{},{}) ".format(math.degrees(angle), base.x, base.y)
    if flip:
        svg += "translate({},{}) ".format(base.x, base.y)
    else:
        svg += "translate({},{}) ".format(base.x, -base.y)
    # svg += 'scale({},-{}) '.format(tmod/2000, tmod/2000)

    if flip:
        svg += "scale(1,-1) "
    else:
        svg += "scale(1,1) "

    svg += '" '
    svg += 'freecad:skip="1"'
    svg += ">\n"
    return svg


def get_text(
    plane,
    techdraw,
    tcolor,
    fontsize,
    fontname,
    angle,
    base,
    text,
    linespacing=0.5,
    align="center",
    flip=True,
):
    """Get the SVG representation of a textual element."""
    if isinstance(angle, App.Rotation):
        if not plane:
            angle = angle.Angle
        else:
            if plane.axis.getAngle(angle.Axis) < 0.001:
                angle = angle.Angle
            elif abs(plane.axis.getAngle(angle.Axis) - math.pi) < 0.001:
                if abs(angle.Angle) > 0.1:
                    angle = -angle.Angle
                else:
                    angle = angle.Angle
            elif abs(plane.axis.getAngle(angle.Axis) - math.pi / 2) < 0.001:
                # text is perpendicular to view, so it shouldn't appear
                return ""
            else:
                # Compute an X vector
                vec = App.Vector(1, 0, 0)
                vec = angle.multVec(App.Vector(1, 0, 0))
                angle = DraftVecUtils.angle(vec, plane.u)

    # text should be a list of strings separated by a newline
    if not isinstance(text, list):
        text = text.split("\n")

    if align.lower() == "center":
        anchor = "middle"
    elif align.lower() == "left":
        anchor = "start"
    else:
        anchor = "end"

    if techdraw:
        # For TechDraw display each item in the text list is placed
        # in an individual tag.
        # <text ...> text[0] </text>
        # <text ...> text[1] </text>
        svg = _get_text_techdraw(
            text, tcolor, fontsize, anchor, align, fontname, angle, base, linespacing
        )
    else:
        # If the SVG is not for TechDraw, and there is a single item
        # in the text list, place it in a single tag.
        # <text ...> text </text>
        #
        # For multiple elements, place each element inside a <tspan> tag.
        # <text ...>
        #   <tspan>text[0]</tspan>
        #   <tspan>text[1]</tspan>
        # </text>
        svg = _get_text_header(tcolor, fontsize, anchor, align, fontname, angle, base, flip)

        if len(text) == 1:
            _t = text[0].replace("&", "&amp;").replace("<", "&lt;")
            svg += _t.replace(">", "&gt;")
        else:
            for i in range(len(text)):
                if i == 0:
                    svg += "<tspan>"
                else:
                    svg += '<tspan x="0" dy="{}">'.format(linespacing)
                _t = text[i].replace("&", "&amp;").replace("<", "&lt;")
                svg += _t.replace(">", "&gt;")
                svg += "</tspan>\n"
        svg += "</text>\n"
    return svg


def getText(
    plane,
    techdraw,
    tcolor,
    fontsize,
    fontname,
    angle,
    base,
    text,
    linespacing=0.5,
    align="center",
    flip=True,
):
    """Get the SVG representation of a textual element. DEPRECATED."""
    utils.use_instead("get_text")
    return get_text(
        plane, techdraw, tcolor, fontsize, fontname, angle, base, text, linespacing, align, flip
    )


## @}