# -*- encoding: utf-8 -*-
from __future__ import print_function, division

from sympy.core.backend import sympify
from sympy.physics.vector import Point, ReferenceFrame, Dyadic

__all__ = ['RigidBody']


class RigidBody(object):
    """An idealized rigid body.

    This is essentially a container which holds the various components which
    describe a rigid body: a name, mass, center of mass, reference frame, and
    inertia.

    All of these need to be supplied on creation, but can be changed
    afterwards.

    Attributes
    ==========
    name : string
        The body's name.
    masscenter : Point
        The point which represents the center of mass of the rigid body.
    frame : ReferenceFrame
        The ReferenceFrame which the rigid body is fixed in.
    mass : Sympifyable
        The body's mass.
    inertia : (Dyadic, Point)
        The body's inertia about a point; stored in a tuple as shown above.

    Examples
    ========

    >>> from sympy import Symbol
    >>> from sympy.physics.mechanics import ReferenceFrame, Point, RigidBody
    >>> from sympy.physics.mechanics import outer
    >>> m = Symbol('m')
    >>> A = ReferenceFrame('A')
    >>> P = Point('P')
    >>> I = outer (A.x, A.x)
    >>> inertia_tuple = (I, P)
    >>> B = RigidBody('B', P, A, m, inertia_tuple)
    >>> # Or you could change them afterwards
    >>> m2 = Symbol('m2')
    >>> B.mass = m2

    """

    def __init__(self, name, masscenter, frame, mass, inertia):
        if not isinstance(name, str):
            raise TypeError('Supply a valid name.')
        self._name = name
        self.masscenter = masscenter
        self.mass = mass
        self.frame = frame
        self.inertia = inertia
        self.potential_energy = 0

    def __str__(self):
        return self._name

    __repr__ = __str__

    @property
    def frame(self):
        return self._frame

    @frame.setter
    def frame(self, F):
        if not isinstance(F, ReferenceFrame):
            raise TypeError("RigdBody frame must be a ReferenceFrame object.")
        self._frame = F

    @property
    def masscenter(self):
        return self._masscenter

    @masscenter.setter
    def masscenter(self, p):
        if not isinstance(p, Point):
            raise TypeError("RigidBody center of mass must be a Point object.")
        self._masscenter = p

    @property
    def mass(self):
        return self._mass

    @mass.setter
    def mass(self, m):
        self._mass = sympify(m)

    @property
    def inertia(self):
        return (self._inertia, self._inertia_point)

    @inertia.setter
    def inertia(self, I):
        if not isinstance(I[0], Dyadic):
            raise TypeError("RigidBody inertia must be a Dyadic object.")
        if not isinstance(I[1], Point):
            raise TypeError("RigidBody inertia must be about a Point.")
        self._inertia = I[0]
        self._inertia_point = I[1]
        # have I S/O, want I S/S*
        # I S/O = I S/S* + I S*/O; I S/S* = I S/O - I S*/O
        # I_S/S* = I_S/O - I_S*/O
        from sympy.physics.mechanics.functions import inertia_of_point_mass
        I_Ss_O = inertia_of_point_mass(self.mass,
                                       self.masscenter.pos_from(I[1]),
                                       self.frame)
        self._central_inertia = I[0] - I_Ss_O

    @property
    def central_inertia(self):
        """The body's central inertia dyadic."""
        return self._central_inertia

    def linear_momentum(self, frame):
        """ Linear momentum of the rigid body.

        The linear momentum L, of a rigid body B, with respect to frame N is
        given by

        L = M * v*

        where M is the mass of the rigid body and v* is the velocity of
        the mass center of B in the frame, N.

        Parameters
        ==========

        frame : ReferenceFrame
            The frame in which linear momentum is desired.

        Examples
        ========

        >>> from sympy.physics.mechanics import Point, ReferenceFrame, outer
        >>> from sympy.physics.mechanics import RigidBody, dynamicsymbols
        >>> M, v = dynamicsymbols('M v')
        >>> N = ReferenceFrame('N')
        >>> P = Point('P')
        >>> P.set_vel(N, v * N.x)
        >>> I = outer (N.x, N.x)
        >>> Inertia_tuple = (I, P)
        >>> B = RigidBody('B', P, N, M, Inertia_tuple)
        >>> B.linear_momentum(N)
        M*v*N.x

        """

        return self.mass * self.masscenter.vel(frame)

    def angular_momentum(self, point, frame):
        """Returns the angular momentum of the rigid body about a point in the
        given frame.

        The angular momentum H of a rigid body B about some point O in a frame
        N is given by:

            H = I·w + r×Mv

        where I is the central inertia dyadic of B, w is the angular velocity
        of body B in the frame, N, r is the position vector from point O to the
        mass center of B, and v is the velocity of the mass center in the
        frame, N.

        Parameters
        ==========
        point : Point
            The point about which angular momentum is desired.
        frame : ReferenceFrame
            The frame in which angular momentum is desired.

        Examples
        ========

        >>> from sympy.physics.mechanics import Point, ReferenceFrame, outer
        >>> from sympy.physics.mechanics import RigidBody, dynamicsymbols
        >>> M, v, r, omega = dynamicsymbols('M v r omega')
        >>> N = ReferenceFrame('N')
        >>> b = ReferenceFrame('b')
        >>> b.set_ang_vel(N, omega * b.x)
        >>> P = Point('P')
        >>> P.set_vel(N, 1 * N.x)
        >>> I = outer(b.x, b.x)
        >>> B = RigidBody('B', P, b, M, (I, P))
        >>> B.angular_momentum(P, N)
        omega*b.x

        """
        I = self.central_inertia
        w = self.frame.ang_vel_in(frame)
        m = self.mass
        r = self.masscenter.pos_from(point)
        v = self.masscenter.vel(frame)

        return I.dot(w) + r.cross(m * v)

    def kinetic_energy(self, frame):
        """Kinetic energy of the rigid body

        The kinetic energy, T, of a rigid body, B, is given by

        'T = 1/2 (I omega^2 + m v^2)'

        where I and m are the central inertia dyadic and mass of rigid body B,
        respectively, omega is the body's angular velocity and v is the
        velocity of the body's mass center in the supplied ReferenceFrame.

        Parameters
        ==========

        frame : ReferenceFrame
            The RigidBody's angular velocity and the velocity of it's mass
            center are typically defined with respect to an inertial frame but
            any relevant frame in which the velocities are known can be supplied.

        Examples
        ========

        >>> from sympy.physics.mechanics import Point, ReferenceFrame, outer
        >>> from sympy.physics.mechanics import RigidBody
        >>> from sympy import symbols
        >>> M, v, r, omega = symbols('M v r omega')
        >>> N = ReferenceFrame('N')
        >>> b = ReferenceFrame('b')
        >>> b.set_ang_vel(N, omega * b.x)
        >>> P = Point('P')
        >>> P.set_vel(N, v * N.x)
        >>> I = outer (b.x, b.x)
        >>> inertia_tuple = (I, P)
        >>> B = RigidBody('B', P, b, M, inertia_tuple)
        >>> B.kinetic_energy(N)
        M*v**2/2 + omega**2/2

        """

        rotational_KE = (self.frame.ang_vel_in(frame) & (self.central_inertia &
                self.frame.ang_vel_in(frame)) / sympify(2))

        translational_KE = (self.mass * (self.masscenter.vel(frame) &
            self.masscenter.vel(frame)) / sympify(2))

        return rotational_KE + translational_KE

    @property
    def potential_energy(self):
        """The potential energy of the RigidBody.

        Examples
        ========

        >>> from sympy.physics.mechanics import RigidBody, Point, outer, ReferenceFrame
        >>> from sympy import symbols
        >>> M, g, h = symbols('M g h')
        >>> b = ReferenceFrame('b')
        >>> P = Point('P')
        >>> I = outer (b.x, b.x)
        >>> Inertia_tuple = (I, P)
        >>> B = RigidBody('B', P, b, M, Inertia_tuple)
        >>> B.potential_energy = M * g * h
        >>> B.potential_energy
        M*g*h

        """

        return self._pe

    @potential_energy.setter
    def potential_energy(self, scalar):
        """Used to set the potential energy of this RigidBody.

        Parameters
        ==========

        scalar: Sympifyable
            The potential energy (a scalar) of the RigidBody.

        Examples
        ========

        >>> from sympy.physics.mechanics import Particle, Point, outer
        >>> from sympy.physics.mechanics import RigidBody, ReferenceFrame
        >>> from sympy import symbols
        >>> b = ReferenceFrame('b')
        >>> M, g, h = symbols('M g h')
        >>> P = Point('P')
        >>> I = outer (b.x, b.x)
        >>> Inertia_tuple = (I, P)
        >>> B = RigidBody('B', P, b, M, Inertia_tuple)
        >>> B.potential_energy = M * g * h

        """

        self._pe = sympify(scalar)
