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

import collections


class Coordinate():
    """
    A coordinate in a PCB file.
    """

    MIL = 1e2
    MM = 1e5 / 25.4

    def __init__(self, raw: float = 0):
        self._raw = round(raw)

    def __repr__(self) -> str:
        return f'Coordinate({self._raw:d})'

    def _compare(self, other) -> int:
        if not isinstance(other, Coordinate):
            raise ValueError(f'{type(self).__name__:s} cannot be'
                             f' compared to {type(other).__name__:s}')
        if self._raw < other._raw:
            return -1
        if self._raw > other._raw:
            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

    def __add__(self, other):
        assert isinstance(other, Coordinate)
        return Coordinate(self._raw + other._raw)

    def __mul__(self, other):
        return Coordinate(self._raw * other)

    def __neg__(self):
        return Coordinate(-self._raw)

    def __sub__(self, other):
        assert isinstance(other, Coordinate)
        return Coordinate(self._raw - other._raw)

    def __truediv__(self, other):
        return Coordinate(self._raw / other)

    @property
    def mil(self) -> float:
        return self._raw / self.MIL

    @mil.setter
    def mil(self, mil: float):
        self._raw = round(mil * self.MIL)

    @property
    def mm(self) -> float:
        return self._raw / self.MM

    @mm.setter
    def mm(self, mm: float):
        self._raw = round(mm * self.MM)

    @property
    def raw(self) -> int:
        return self._raw

    @raw.setter
    def raw(self, raw: float):
        self._raw = round(raw)


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([
        # attributes
        ('s_flags', []),
        ('desc', ''),
        ('name', ''),
        ('value', ''),
        ('m_x', Coordinate(0)),
        ('m_y', Coordinate(0)),
        ('t_x', Coordinate(0)),
        ('t_y', Coordinate(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([
        # attributes
        ('r_x', Coordinate(0)),
        ('r_y', Coordinate(0)),
        ('width', Coordinate(0)),
        ('height', Coordinate(0)),
        ('start_angle', 0.0),
        ('end_angle', 0.0),
        ('thickness', Coordinate(0))
    ])

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


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

    _attrs = collections.OrderedDict([
        # attributes
        ('r_x1', Coordinate(0)),
        ('r_y1', Coordinate(0)),
        ('r_x2', Coordinate(0)),
        ('r_y2', Coordinate(0)),
        ('thickness', Coordinate(0))
    ])

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


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

    _attrs = collections.OrderedDict([
        # attributes
        ('r_x1', Coordinate(0)),
        ('r_y1', Coordinate(0)),
        ('r_x2', Coordinate(0)),
        ('r_y2', Coordinate(0)),
        ('thickness', Coordinate(0)),
        ('clearance', Coordinate(0)),
        ('mask', Coordinate(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([
        # attributes
        ('r_x', Coordinate(0)),
        ('r_y', Coordinate(0)),
        ('thickness', Coordinate(0)),
        ('clearance', Coordinate(0)),
        ('mask', Coordinate(0)),
        ('drill', Coordinate(0)),
        ('name', ''),
        ('number', ''),
        ('s_flags', []),
    ])

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