# ##### BEGIN GPL LICENSE BLOCK #####
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 2
#  of the License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software Foundation,
#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# ##### END GPL LICENSE BLOCK #####

# <pep8 compliant>

from bpy.types import (
    Panel,
)


def rigid_body_warning(layout, text):
    row = layout.row(align=True)
    row.alignment = 'RIGHT'
    row.label(text=text, icon='ERROR')


class PHYSICS_PT_rigidbody_panel:
    bl_space_type = 'PROPERTIES'
    bl_region_type = 'WINDOW'
    bl_context = "physics"


class PHYSICS_PT_rigid_body(PHYSICS_PT_rigidbody_panel, Panel):
    bl_label = "Rigid Body"
    COMPAT_ENGINES = {'BLENDER_RENDER', 'BLENDER_EEVEE', 'BLENDER_WORKBENCH'}

    @classmethod
    def poll(cls, context):
        obj = context.object
        return (obj and obj.rigid_body and (context.engine in cls.COMPAT_ENGINES))

    def draw(self, context):
        layout = self.layout
        layout.use_property_split = True

        ob = context.object
        parent = ob.parent
        rbo = ob.rigid_body

        if rbo is None:
            rigid_body_warning(layout, "Object does not have a Rigid Body")
            return

        if parent is not None and parent.rigid_body is not None:
            if parent.rigid_body.collision_shape == 'COMPOUND':
                row = layout.row(align=True)
                row.alignment = 'RIGHT'
                row.label(text="This object is part of a compound shape", icon='INFO')
            else:
                rigid_body_warning(layout, "Rigid Body can't be child of a non compound Rigid Body")
            return

        if parent is None or parent.rigid_body is None:
            layout.prop(rbo, "type", text="Type")


class PHYSICS_PT_rigid_body_settings(PHYSICS_PT_rigidbody_panel, Panel):
    bl_label = "Settings"
    bl_parent_id = 'PHYSICS_PT_rigid_body'
    COMPAT_ENGINES = {'BLENDER_RENDER', 'BLENDER_EEVEE', 'BLENDER_WORKBENCH'}

    @classmethod
    def poll(cls, context):
        obj = context.object
        if obj.parent is not None and obj.parent.rigid_body is not None:
            return False
        return (obj and obj.rigid_body and (context.engine in cls.COMPAT_ENGINES))

    def draw(self, context):
        layout = self.layout
        layout.use_property_split = True

        ob = context.object
        rbo = ob.rigid_body

        if rbo is None:
            rigid_body_warning(layout, "Object does not have a Rigid Body")
            return

        col = layout.column()

        if rbo.type == 'ACTIVE':
            col.prop(rbo, "mass")
            col.prop(rbo, "enabled", text="Dynamic")

        col.prop(rbo, "kinematic", text="Animated")


class PHYSICS_PT_rigid_body_collisions(PHYSICS_PT_rigidbody_panel, Panel):
    bl_label = "Collisions"
    bl_parent_id = 'PHYSICS_PT_rigid_body'
    COMPAT_ENGINES = {'BLENDER_RENDER', 'BLENDER_EEVEE', 'BLENDER_WORKBENCH'}

    @classmethod
    def poll(cls, context):
        obj = context.object
        if (
                (obj.parent is not None) and
                (obj.parent.rigid_body is not None) and
                (not obj.parent.rigid_body.collision_shape == 'COMPOUND')
        ):
            return False
        return (obj and obj.rigid_body and (context.engine in cls.COMPAT_ENGINES))

    def draw(self, context):
        layout = self.layout

        ob = context.object
        parent = ob.parent
        rbo = ob.rigid_body
        layout.use_property_split = True

        layout.prop(rbo, "collision_shape", text="Shape")

        if rbo.collision_shape == 'COMPOUND':
            if (
                    (parent is not None) and
                    (parent.rigid_body is not None) and
                    (parent.rigid_body.collision_shape == 'COMPOUND')
            ):
                rigid_body_warning(layout, "Sub compound shapes are not allowed")
            else:
                found = False
                for child in ob.children:
                    if child.rigid_body is not None:
                        found = True
                        break
                if not found:
                    rigid_body_warning(layout, "There are no child rigid bodies")

        if rbo.collision_shape in {'MESH', 'CONVEX_HULL'}:
            layout.prop(rbo, "mesh_source", text="Source")

        if rbo.collision_shape == 'MESH' and rbo.mesh_source == 'DEFORM':
            layout.prop(rbo, "use_deform", text="Deforming")


class PHYSICS_PT_rigid_body_collisions_surface(PHYSICS_PT_rigidbody_panel, Panel):
    bl_label = "Surface Response"
    bl_parent_id = 'PHYSICS_PT_rigid_body_collisions'
    bl_options = {'DEFAULT_CLOSED'}
    COMPAT_ENGINES = {'BLENDER_RENDER', 'BLENDER_EEVEE', 'BLENDER_WORKBENCH'}

    @classmethod
    def poll(cls, context):
        obj = context.object
        if obj.parent is not None and obj.parent.rigid_body is not None:
            return False
        return (obj and obj.rigid_body and (context.engine in cls.COMPAT_ENGINES))

    def draw(self, context):
        layout = self.layout
        layout.use_property_split = True
        flow = layout.grid_flow(row_major=True, columns=0, even_columns=True, even_rows=False, align=True)

        ob = context.object
        rbo = ob.rigid_body

        col = flow.column()
        col.prop(rbo, "friction")

        col = flow.column()
        col.prop(rbo, "restitution", text="Bounciness")


class PHYSICS_PT_rigid_body_collisions_sensitivity(PHYSICS_PT_rigidbody_panel, Panel):
    bl_label = "Sensitivity"
    bl_parent_id = 'PHYSICS_PT_rigid_body_collisions'
    bl_options = {'DEFAULT_CLOSED'}
    COMPAT_ENGINES = {'BLENDER_RENDER', 'BLENDER_EEVEE', 'BLENDER_WORKBENCH'}

    @classmethod
    def poll(cls, context):
        obj = context.object
        if (
                (obj.parent is not None) and
                (obj.parent.rigid_body is not None) and
                (not obj.parent.rigid_body.collision_shape == 'COMPOUND')
        ):
            return False
        return (obj and obj.rigid_body and (context.engine in cls.COMPAT_ENGINES))

    def draw(self, context):
        layout = self.layout
        layout.use_property_split = True

        ob = context.object
        rbo = ob.rigid_body

        if rbo.collision_shape in {'MESH', 'CONE'}:
            col = layout.column()
            col.prop(rbo, "collision_margin", text="Margin")
        else:
            flow = layout.grid_flow(row_major=True, columns=0, even_columns=True, even_rows=False, align=True)
            col = flow.column()
            col.prop(rbo, "use_margin")

            col = flow.column()
            col.active = rbo.use_margin
            col.prop(rbo, "collision_margin", text="Margin")


class PHYSICS_PT_rigid_body_collisions_collections(PHYSICS_PT_rigidbody_panel, Panel):
    bl_label = "Collections"
    bl_parent_id = 'PHYSICS_PT_rigid_body_collisions'
    bl_options = {'DEFAULT_CLOSED'}
    COMPAT_ENGINES = {'BLENDER_RENDER', 'BLENDER_EEVEE', 'BLENDER_WORKBENCH'}

    @classmethod
    def poll(cls, context):
        obj = context.object
        if obj.parent is not None and obj.parent.rigid_body is not None:
            return False
        return (obj and obj.rigid_body and (context.engine in cls.COMPAT_ENGINES))

    def draw(self, context):
        layout = self.layout

        ob = context.object
        rbo = ob.rigid_body

        layout.prop(rbo, "collision_collections", text="")


class PHYSICS_PT_rigid_body_dynamics(PHYSICS_PT_rigidbody_panel, Panel):
    bl_label = "Dynamics"
    bl_parent_id = 'PHYSICS_PT_rigid_body'
    bl_options = {'DEFAULT_CLOSED'}
    COMPAT_ENGINES = {'BLENDER_RENDER', 'BLENDER_EEVEE', 'BLENDER_WORKBENCH'}

    @classmethod
    def poll(cls, context):
        obj = context.object
        if obj.parent is not None and obj.parent.rigid_body is not None:
            return False
        return (obj and obj.rigid_body and obj.rigid_body.type == 'ACTIVE'
                and (context.engine in cls.COMPAT_ENGINES))

    def draw(self, context):
        layout = self.layout
        layout.use_property_split = True
        flow = layout.grid_flow(row_major=True, columns=0, even_columns=True, even_rows=False, align=True)

        ob = context.object
        rbo = ob.rigid_body

        # col = layout.column(align=True)
        # col.label(text="Activation:")
        # XXX: settings such as activate on collison/etc.

        col = flow.column()
        col.prop(rbo, "linear_damping", text="Damping Translation")

        col = flow.column()
        col.prop(rbo, "angular_damping", text="Rotation")


class PHYSICS_PT_rigid_body_dynamics_deactivation(PHYSICS_PT_rigidbody_panel, Panel):
    bl_label = "Deactivation"
    bl_parent_id = 'PHYSICS_PT_rigid_body_dynamics'
    bl_options = {'DEFAULT_CLOSED'}
    COMPAT_ENGINES = {'BLENDER_RENDER', 'BLENDER_EEVEE', 'BLENDER_WORKBENCH'}

    @classmethod
    def poll(cls, context):
        obj = context.object
        return (obj and obj.rigid_body
                and obj.rigid_body.type == 'ACTIVE'
                and (context.engine in cls.COMPAT_ENGINES))

    def draw_header(self, context):
        ob = context.object
        rbo = ob.rigid_body
        self.layout.prop(rbo, "use_deactivation", text="")

    def draw(self, context):
        layout = self.layout
        layout.use_property_split = True
        flow = layout.grid_flow(row_major=True, columns=0, even_columns=True, even_rows=False, align=True)

        ob = context.object
        rbo = ob.rigid_body

        layout.active = rbo.use_deactivation

        col = flow.column()
        col.prop(rbo, "use_start_deactivated")

        col = flow.column()
        col.prop(rbo, "deactivate_linear_velocity", text="Velocity Linear")
        col.prop(rbo, "deactivate_angular_velocity", text="Angular")
        # TODO: other params such as time?


classes = (
    PHYSICS_PT_rigid_body,
    PHYSICS_PT_rigid_body_settings,
    PHYSICS_PT_rigid_body_collisions,
    PHYSICS_PT_rigid_body_collisions_surface,
    PHYSICS_PT_rigid_body_collisions_sensitivity,
    PHYSICS_PT_rigid_body_collisions_collections,
    PHYSICS_PT_rigid_body_dynamics,
    PHYSICS_PT_rigid_body_dynamics_deactivation,
)


if __name__ == "__main__":  # only for live edit.
    from bpy.utils import register_class
    for cls in classes:
        register_class(cls)
