import_svg.py

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# <pep8 compliant>

import re
import xml.dom.minidom
from math import cos, sin, tan, atan2, pi, ceil

import bpy
from mathutils import Vector, Matrix

from . import svg_colors

#### Common utilities ####

# TODO: "em" and "ex" aren't actually supported
SVGUnits = {"": 1.0,
            "px": 1.0,
            "in": 90.0,
            "mm": 90.0 / 25.4,
            "cm": 90.0 / 2.54,
            "pt": 1.25,
            "pc": 15.0,
            "em": 1.0,
            "ex": 1.0,
            "INVALID": 1.0,  # some DocBook files contain this
            }

SVGEmptyStyles = {'useFill': None,
                  'fill': None}


def SVGParseFloat(s, i=0):
    """
    Parse first float value from string

    Returns value as string
    """

    start = i
    n = len(s)
    token = ''

    # Skip leading whitespace characters
    while i < n and (s[i].isspace() or s[i] == ','):
        i += 1

    if i == n:
        return None, i

    # Read sign
    if s[i] == '-':
        token += '-'
        i += 1
    elif s[i] == '+':
        i += 1

    # Read integer part
    if s[i].isdigit():
        while i < n and s[i].isdigit():
            token += s[i]
            i += 1

    # Fractional part
    if i < n and s[i] == '.':
        token += '.'
        i += 1

        if s[i].isdigit():
            while i < n and s[i].isdigit():
                token += s[i]
                i += 1
        elif s[i].isspace() or s[i] == ',':
            # Inkscape sometimes uses qeird float format with missed
            # fractional part after dot. Suppose zero fractional part
            # for this case
            pass
        else:
            raise Exception('Invalid float value near ' + s[start:start + 10])

    # Degree
    if  i < n and (s[i] == 'e' or s[i] == 'E'):
        token += s[i]
        i += 1
        if s[i] == '+' or s[i] == '-':
            token += s[i]
            i += 1

            if s[i].isdigit():
                while i < n and s[i].isdigit():
                    token += s[i]
                    i += 1
            else:
                raise Exception('Invalid float value near ' +
                    s[start:start + 10])
        else:
            raise Exception('Invalid float value near ' + s[start:start + 10])

    return token, i


def SVGCreateCurve():
    """
    Create new curve object to hold splines in
    """

    cu = bpy.data.curves.new("Curve", 'CURVE')
    obj = bpy.data.objects.new("Curve", cu)
    bpy.context.scene.objects.link(obj)

    return obj


def SVGFinishCurve():
    """
    Finish curve creation
    """

    pass


def SVGFlipHandle(x, y, x1, y1):
    """
    Flip handle around base point
    """

    x = x + (x - x1)
    y = y + (y - y1)

    return x, y


def SVGParseCoord(coord, size):
    """
    Parse coordinate component to common basis

    Needed to handle coordinates set in cm, mm, iches..
    """

    token, last_char = SVGParseFloat(coord)
    val = float(token)
    unit = coord[last_char:].strip()  # strip() in case there is a space

    if unit == '%':
        return float(size) / 100.0 * val
    else:
        return val * SVGUnits[unit]

    return val


def SVGRectFromNode(node, context):
    """
    Get display rectangle from node
    """

    w = context['rect'][0]
    h = context['rect'][1]

    if node.getAttribute('viewBox'):
        viewBox = node.getAttribute('viewBox').replace(',', ' ').split()
        w = SVGParseCoord(viewBox[2], w)
        h = SVGParseCoord(viewBox[3], h)
    else:
        if node.getAttribute('width'):
            w = SVGParseCoord(node.getAttribute('width'), w)

        if node.getAttribute('height'):
            h = SVGParseCoord(node.getAttribute('height'), h)

    return (w, h)


def SVGMatrixFromNode(node, context):
    """
    Get transformation matrix from given node
    """

    tagName = node.tagName.lower()
    tags = ['svg:svg', 'svg:use', 'svg:symbol']

    if tagName not in tags and 'svg:' + tagName not in tags:
        return Matrix()