"""
Types representing entities of GNU PCB files.
"""

import collections


class Struct:
    """
    Base class for struct-like Python objects
    """

    _attrs = collections.OrderedDict()  # attribute name: str -> default value

    def __init__(self, **kwargs):
        for name, def_val in self._attrs.items():
            setattr(self, name, def_val)
        for name, val in kwargs.items():
            if name not in self._attrs:
                raise ValueError(
                    f'{type(self).__name__:s} does not have attribute {name:s}'
                )
            setattr(self, name, val)

    def __repr__(self) -> str:
        vals = ', '.join([
            f'{name:s}={repr(getattr(self, name)):s}'
            for name in self._attrs.keys()
        ])
        return f'{type(self).__name__:s}({vals:s})'

    def _compare(self, other) -> int:
        if self._attrs != other._attrs:
            raise ValueError(f'{type(self).__name__:s} cannot be'
                             f' compared to {type(other).__name__:s}')
        for name in self._attrs:
            s = getattr(self, name)
            o = getattr(other, name)
            if s < o:
                return -1
            if s > o:
                return 1
        return 0

    def __eq__(self, other) -> bool:
        return self._compare(other) == 0

    def __ne__(self, other) -> bool:
        return self._compare(other) != 0

    def __lt__(self, other) -> bool:
        return self._compare(other) < 0

    def __le__(self, other) -> bool:
        return self._compare(other) <= 0

    def __gt__(self, other) -> bool:
        return self._compare(other) > 0

    def __ge__(self, other) -> bool:
        return self._compare(other) >= 0


class Element(Struct):
    """
    Element entity in a GNU PCB file.
    """

    _attrs = collections.OrderedDict([('s_flags', []), ('desc', ''),
                                      ('name', ''), ('value', ''),
                                      ('m_x', 0.0), ('m_y', 0.0), ('t_x', 0.0),
                                      ('t_y', 0.0), ('t_dir', 0),
                                      ('t_scale', 0.0), ('t_s_flags', []),
                                      ('body', [])])

    def __init__(self, **kwargs):
        super().__init__(**kwargs)


class ElementArc(Struct):
    """
    ElementArc entity in a GNU PCB file.
    """

    _attrs = collections.OrderedDict([('r_x', 0.0), ('r_y', 0.0),
                                      ('width', 0.0), ('height', 0.0),
                                      ('start_angle', 0.0), ('end_angle', 0.0),
                                      ('thickness', 0.0)])

    def __init__(self, **kwargs):
        super().__init__(**kwargs)


class ElementLine(Struct):
    """
    ElementLine entity in a GNU PCB file.
    """

    _attrs = collections.OrderedDict([('r_x1', 0.0), ('r_y1', 0.0),
                                      ('r_x2', 0.0), ('r_y2', 0.0),
                                      ('thickness', 0.0)])

    def __init__(self, **kwargs):
        super().__init__(**kwargs)


class Pad(Struct):
    """
    Pad entity in a GNU PCB file.
    """

    _attrs = collections.OrderedDict([
        ('r_x1', 0.0),
        ('r_y1', 0.0),
        ('r_x2', 0.0),
        ('r_y2', 0.0),
        ('thickness', 0.0),
        ('clearance', 0.0),
        ('mask', 0.0),
        ('name', ''),
        ('number', ''),
        ('s_flags', []),
    ])

    def __init__(self, **kwargs):
        super().__init__(**kwargs)


class Pin(Struct):
    """
    Pin entity in a GNU PCB file.
    """

    _attrs = collections.OrderedDict([
        ('r_x', 0.0),
        ('r_y', 0.0),
        ('thickness', 0.0),
        ('clearance', 0.0),
        ('mask', 0.0),
        ('drill', 0.0),
        ('name', ''),
        ('number', ''),
        ('s_flags', []),
    ])

    def __init__(self, **kwargs):
        super().__init__(**kwargs)