# -*- coding: utf-8 -*-

# ***************************************************************************
# *                                                                         *
# *   Copyright (c) 2016 sliptonic <shopinthewoods@gmail.com>               *
# *                                                                         *
# *   This program is free software; you can redistribute it and/or modify  *
# *   it under the terms of the GNU Lesser General Public License (LGPL)    *
# *   as published by the Free Software Foundation; either version 2 of     *
# *   the License, or (at your option) any later version.                   *
# *   for detail see the LICENCE text file.                                 *
# *                                                                         *
# *   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 Library General Public License for more details.                  *
# *                                                                         *
# *   You should have received a copy of the GNU Library General Public     *
# *   License along with this program; if not, write to the Free Software   *
# *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  *
# *   USA                                                                   *
# *                                                                         *
# ***************************************************************************

import FreeCAD
import Part
import math
import unittest

from FreeCAD import Vector
from PathScripts.PathGeom import Side

class PathTestBase(unittest.TestCase):
    """Base test class with some addtional asserts."""

    def assertRoughly(self, f1, f2):
        """Verify that two float values are approximately the same."""
        self.assertTrue(math.fabs(f1 - f2) < 0.00001, "%f != %f" % (f1, f2))

    def assertCoincide(self, pt1, pt2):
        """Verify that two points coincide - roughly speaking."""
        self.assertRoughly(pt1.x, pt2.x)
        self.assertRoughly(pt1.y, pt2.y)
        self.assertRoughly(pt1.z, pt2.z)

    def assertLine(self, edge, pt1, pt2):
        """Verify that edge is a line from pt1 to pt2."""
        self.assertIs(type(edge.Curve), Part.LineSegment)
        self.assertCoincide(edge.Curve.StartPoint, pt1)
        self.assertCoincide(edge.Curve.EndPoint, pt2)

    def assertLines(self, edgs, tail, points):
        """Verify that the edges match the polygon resulting from points."""
        edges = list(edgs)
        if tail:
            edges.append(tail)
        self.assertEqual(len(edges), len(points) - 1)

        for i in range(0, len(edges)):
            self.assertLine(edges[i], points[i], points[i+1])

    def assertArc(self, edge, pt1, pt2, direction = 'CW'):
        """Verify that edge is an arc between pt1 and pt2 with the given direction."""
        self.assertIs(type(edge.Curve), Part.Circle)
        self.assertCoincide(edge.valueAt(edge.FirstParameter), pt1)
        self.assertCoincide(edge.valueAt(edge.LastParameter), pt2)
        ptm = edge.valueAt((edge.LastParameter + edge.FirstParameter)/2)
        side = Side.of(pt2 - pt1, ptm - pt1)
        if 'CW' == direction:
            self.assertEqual(side, Side.Left)
        else:
            self.assertEqual(side, Side.Right)

    def assertCircle(self, edge, pt, r):
        """Verivy that edge is a circle at given location."""
        curve = edge.Curve
        self.assertIs(type(curve), Part.Circle)
        self.assertCoincide(curve.Center, Vector(pt.x, pt.y, pt.z))
        self.assertRoughly(curve.Radius, r)


    def assertCurve(self, edge, p1, p2, p3):
        """Verify that the edge goes through the given 3 points, representing start, mid and end point respectively."""
        self.assertCoincide(edge.valueAt(edge.FirstParameter), p1)
        self.assertCoincide(edge.valueAt(edge.LastParameter), p3)
        self.assertCoincide(edge.valueAt((edge.FirstParameter + edge.LastParameter)/2), p2)

    def assertCylinderAt(self, solid, pt, r, h):
        """Verify that solid is a cylinder at the specified location."""
        self.assertEqual(len(solid.Edges), 3)

        lid  = solid.Edges[0]
        hull = solid.Edges[1]
        base = solid.Edges[2]

        self.assertCircle(lid, Vector(pt.x, pt.y, pt.z+h), r)
        self.assertLine(hull, Vector(pt.x+r, pt.y, pt.z), Vector(pt.x+r, pt.y, pt.z+h))
        self.assertCircle(base, Vector(pt.x, pt.y, pt.z), r)

    def assertConeAt(self, solid, pt, r1, r2, h):
        """Verify that solid is a cone at the specified location."""
        self.assertEqual(len(solid.Edges), 3)

        lid  = solid.Edges[0]
        hull = solid.Edges[1]
        base = solid.Edges[2]

        self.assertCircle(lid, Vector(pt.x, pt.y, pt.z+h), r2)
        self.assertLine(hull, Vector(pt.x+r1, pt.y, pt.z), Vector(pt.x+r2, pt.y, pt.z+h))
        self.assertCircle(base, Vector(pt.x, pt.y, pt.z), r1)