#!/usr/bin/env python
# -*- coding: utf-8 -*-

# Copyright 2014 Hamilton Kibbe <ham@hamiltonkib.be>

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#     http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
gerber.utils
============
**Gerber and Excellon file handling utilities**

This module provides utility functions for working with Gerber and Excellon
files.
"""

import os
import re
import textwrap
from enum import Enum
from math import radians, sin, cos, sqrt, atan2, pi

class UnknownStatementWarning(Warning):
    pass

class RegexMatcher:
    def __init__(self):
        self.mapping = {}

    def match(self, regex):
        def wrapper(fun):
            nonlocal self
            self.mapping[regex] = fun
            return fun
        return wrapper

    def handle(self, inst, line):
        for regex, handler in self.mapping.items():
            if (match := re.fullmatch(regex, line)):
                handler(inst, match)
                return True
        else:
            return False

class LengthUnit:
    def __init__(self, name, shorthand, this_in_mm):
        self.name = name
        self.shorthand = shorthand
        self.factor = this_in_mm

    def convert_from(self, unit, value):
        if isinstance(unit, str):
            unit = units[unit]

        if unit == self or unit is None or value is None:
            return value

        return value * unit.factor / self.factor

    def convert_to(self, unit, value):
        if isinstance(unit, str):
            unit = to_unit(unit)

        if unit is None:
            return value

        return unit.convert_from(self, value)

    def format(self, value):
        return f'{value:.3f}{self.shorthand}'

    def __call__(self, value, unit):
        return self.convert_from(unit, value)

    def __eq__(self, other):
        if isinstance(other, str):
            return other.lower() in (self.name, self.shorthand)
        else:
            return id(self) == id(other)

    # This class is a singleton, we don't want copies around
    def __copy__(self):
        return self

    def __deepcopy__(self, memo):
        return self

    def __str__(self):
        return self.shorthand


MILLIMETERS_PER_INCH = 25.4
Inch = LengthUnit('inch', 'in', MILLIMETERS_PER_INCH)
MM = LengthUnit('millimeter', 'mm', 1)
units = {'inch': Inch, 'mm': MM, None: None}
to_unit = lambda name: units[name.lower() if name else None]


class InterpMode(Enum):
    LINEAR = 0
    CIRCULAR_CW = 1
    CIRCULAR_CCW = 2


def decimal_string(value, precision=6, padding=False):
    """ Convert float to string with limited precision

    Parameters
    ----------
    value : float
        A floating point value.

    precision :
        Maximum number of decimal places to print

    Returns
    -------
    value : string
        The specified value as a  string.

    """
    floatstr = '%0.10g' % value
    integer = None
    decimal = None
    if '.' in floatstr:
        integer, decimal = floatstr.split('.')
    elif ',' in floatstr:
        integer, decimal = floatstr.split(',')
    else:
        integer, decimal = floatstr, "0"

    if len(decimal) > precision:
        decimal = decimal[:precision]
    elif padding:
        decimal = decimal + (precision - len(decimal)) * '0'

    if integer or decimal:
        return ''.join([integer, '.', decimal])
    else:
        return int(floatstr)

def validate_coordinates(position):
    if position is not None:
        if len(position) != 2:
            raise TypeError('Position must be a tuple (n=2) of coordinates')
        else:
            for coord in position:
                if not (isinstance(coord, int) or isinstance(coord, float)):
                    raise TypeError('Coordinates must be integers or floats')

def rotate_point(point, angle, center=(0.0, 0.0)):
    """ Rotate a point about another point.

    Parameters
    -----------
    point : tuple(<float>, <float>)
        Point to rotate about origin or center point

    angle : float
        Angle to rotate the point [degrees]

    center : tuple(<float>, <float>)
        Coordinates about which the point is rotated. Defaults to the origin.

    Returns
    -------
    rotated_point : tuple(<float>, <float>)
        `point` rotated about `center` by `angle` degrees.
    """
    angle = radians(angle)

    cos_angle = cos(angle)
    sin_angle = sin(angle)

    return (
            cos_angle * (point[0] - center[0]) - sin_angle * (point[1] - center[1]) + center[0],
            sin_angle * (point[0] - center[0]) + cos_angle * (point[1] - center[1]) + center[1])

def nearly_equal(point1, point2, ndigits = 6):
    '''Are the points nearly equal'''

    return round(point1[0] - point2[0], ndigits) == 0 and round(point1[1] - point2[1], ndigits) == 0


def sq_distance(point1, point2):

    diff1 = point1[0] - point2[0]
    diff2 = point1[1] - point2[1]
    return diff1 * diff1 + diff2 * diff2

class Tag:
    def __init__(self, name, children=None, root=False, **attrs):
        self.name, self.attrs = name, attrs
        self.children = children or []
        self.root = root

    def __str__(self):
        prefix = '<?xml version="1.0" encoding="utf-8"?>\n' if self.root else ''
        opening = ' '.join([self.name] + [f'{key.replace("__", ":").replace("_", "-")}="{value}"' for key, value in self.attrs.items()])
        if self.children:
            children = '\n'.join(textwrap.indent(str(c), '  ') for c in self.children)
            return f'{prefix}<{opening}>\n{children}\n</{self.name}>'
        else:
            return f'{prefix}<{opening}/>'