#!/usr/bin/env python

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# Author: Mark Moll

import sys
from os.path import abspath, dirname, join
sys.path.insert(0, join(dirname(dirname(dirname(abspath(__file__)))), 'py-bindings'))
from functools import partial
from time import clock
from math import fabs
import unittest
import copy
import ompl.util as ou
import ompl.base as ob
import ompl.control as oc
from ompl.util import setLogLevel, LogLevel

SOLUTION_TIME = 10.0
MAX_VELOCITY = 3.0

class Environment(object):
    def __init__(self, fname):
        fp = open(fname, 'r')
        lines = fp.readlines()
        fp.close()
        self.width, self.height = [int(i) for i in lines[0].split(' ')[1:3]]
        self.grid = []
        self.start = [int(i) for i in lines[1].split(' ')[1:3]]
        self.goal = [int(i) for i in lines[2].split(' ')[1:3]]
        for i in range(self.width):
            self.grid.append(
                [int(j) for j in lines[4+i].split(' ')[0:self.height]])
        self.char_mapping = ['__', '##', 'oo', 'XX']

    def __str__(self):
        result = ''
        for line in self.grid:
            result = result + ''.join([self.char_mapping[c] for c in line]) + '\n'
        return result

def isValid(grid, state):
    # planning is done in a continuous space, but our collision space
    # representation is discrete
    x = int(state[0])
    y = int(state[1])
    if x < 0 or y < 0 or x >= len(grid) or y >= len(grid[0]):
        return False
    return grid[x][y] == 0 # 0 means valid state

class MyStateSpace(ob.RealVectorStateSpace):
    def __init__(self):
        super(MyStateSpace, self).__init__(4)

    def distance(self, state1, state2):
        x1 = int(state1[0])
        y1 = int(state1[1])
        x2 = int(state2[0])
        y2 = int(state2[1])
        return fabs(x1-x2) + fabs(y1-y2)

class MyProjectionEvaluator(ob.ProjectionEvaluator):
    def __init__(self, space, cellSizes):
        super(MyProjectionEvaluator, self).__init__(space)
        self.setCellSizes(cellSizes)

    def getDimension(self):
        return 2

    def project(self, state, projection):
        projection[0] = state[0]
        projection[1] = state[1]

class MyStatePropagator(oc.StatePropagator):
    def propagate(self, state, control, duration, result):
        result[0] = state[0] + duration*control[0]
        result[1] = state[1] + duration*control[1]
        result[2] = control[0]
        result[3] = control[1]

class TestPlanner(object):

    def execute(self, env, time, pathLength, show=False):
        result = True

        sSpace = MyStateSpace()
        sbounds = ob.RealVectorBounds(4)
        # dimension 0 (x) spans between [0, width)
        # dimension 1 (y) spans between [0, height)
        # since sampling is continuous and we round down, we allow values until
        # just under the max limit
        # the resolution is 1.0 since we check cells only
        sbounds.low = ou.vectorDouble()
        sbounds.low.extend([0.0, 0.0, -MAX_VELOCITY, -MAX_VELOCITY])
        sbounds.high = ou.vectorDouble()
        sbounds.high.extend([float(env.width) - 0.000000001, \
            float(env.height) - 0.000000001, \
            MAX_VELOCITY, MAX_VELOCITY])
        sSpace.setBounds(sbounds)

        cSpace = oc.RealVectorControlSpace(sSpace, 2)
        cbounds = ob.RealVectorBounds(2)
        cbounds.low[0] = -MAX_VELOCITY
        cbounds.high[0] = MAX_VELOCITY
        cbounds.low[1] = -MAX_VELOCITY
        cbounds.high[1] = MAX_VELOCITY
        cSpace.setBounds(cbounds)

        ss = oc.SimpleSetup(cSpace)
        isValidFn = ob.StateValidityCheckerFn(partial(isValid, env.grid))
        ss.setStateValidityChecker(isValidFn)
        propagator = MyStatePropagator(ss.getSpaceInformation())
        ss.setStatePropagator(propagator)

        planner = self.newplanner(ss.getSpaceInformation())
        ss.setPlanner(planner)

        # the initial state
        start = ob.State(sSpace)
        start()[0] = env.start[0]
        start()[1] = env.start[1]
        start()[2] = 0.0
        start()[3] = 0.0

        goal = ob.State(sSpace)
        goal()[0] = env.goal[0]
        goal()[1] = env.goal[1]
        goal()[2] = 0.0
        goal()[3] = 0.0

        ss.setStartAndGoalStates(start, goal, 0.05)

        startTime = clock()
        if ss.solve(SOLUTION_TIME):
            elapsed = clock() - startTime
            time = time + elapsed
            if show:
                print('Found solution in %f seconds!' % elapsed)

            path = ss.getSolutionPath()
            path.interpolate()
            if not path.check():
                return (False, time, pathLength)
            pathLength = pathLength + path.length()

            if show:
                print(env, '\n')
                temp = copy.deepcopy(env)
                for i in range(len(path.states)):
                    x = int(path.states[i][0])
                    y = int(path.states[i][1])
                    if temp.grid[x][y] in [0, 2]:
                        temp.grid[x][y] = 2
                    else:
                        temp.grid[x][y] = 3
                print(temp, '\n')
        else:
            result = False

        return (result, time, pathLength)

    def newplanner(self, si):
        raise NotImplementedError('pure virtual method')

class RRTTest(TestPlanner):
    def newplanner(self, si):
        planner = oc.RRT(si)
        return planner

class ESTTest(TestPlanner):
    def newplanner(self, si):
        planner = oc.EST(si)
        cdim = ou.vectorDouble()
        cdim.extend([1, 1])
        ope = MyProjectionEvaluator(si.getStateSpace(), cdim)
        planner.setProjectionEvaluator(ope)
        return planner

class SyclopDecomposition(oc.GridDecomposition):
    def __init__(self, length, bounds):
        super(SyclopDecomposition, self).__init__(length, 2, bounds)

    def project(self, state, coord):
        coord[0] = state[0]
        coord[1] = state[1]

    def sampleFullState(self, sampler, coord, s):
        sampler.sampleUniform(s)
        s[0] = coord[0]
        s[1] = coord[1]

class SyclopRRTTest(TestPlanner):
    def newplanner(self, si):
        spacebounds = si.getStateSpace().getBounds()

        bounds = ob.RealVectorBounds(2)
        bounds.setLow(0, spacebounds.low[0])
        bounds.setLow(1, spacebounds.low[1])
        bounds.setHigh(0, spacebounds.high[0])
        bounds.setHigh(1, spacebounds.high[1])

        # Create a 10x10 grid decomposition for Syclop
        decomp = SyclopDecomposition(10, bounds)
        planner = oc.SyclopRRT(si, decomp)
        # Set syclop parameters conducive to a tiny workspace
        planner.setNumFreeVolumeSamples(1000)
        planner.setNumRegionExpansions(10)
        planner.setNumTreeExpansions(5)
        return planner

class SyclopESTTest(TestPlanner):
    def newplanner(self, si):
        spacebounds = si.getStateSpace().getBounds()

        bounds = ob.RealVectorBounds(2)
        bounds.setLow(0, spacebounds.low[0])
        bounds.setLow(1, spacebounds.low[1])
        bounds.setHigh(0, spacebounds.high[0])
        bounds.setHigh(1, spacebounds.high[1])

        # Create a 10x10 grid decomposition for Syclop
        decomp = SyclopDecomposition(10, bounds)
        planner = oc.SyclopEST(si, decomp)
        # Set syclop parameters conducive to a tiny workspace
        planner.setNumFreeVolumeSamples(1000)
        planner.setNumRegionExpansions(10)
        planner.setNumTreeExpansions(5)
        return planner

class KPIECE1Test(TestPlanner):
    def newplanner(self, si):
        planner = oc.KPIECE1(si)
        cdim = ou.vectorDouble()
        cdim.extend([1, 1])
        ope = MyProjectionEvaluator(si.getStateSpace(), cdim)
        planner.setProjectionEvaluator(ope)
        return planner

class PlanTest(unittest.TestCase):
    def setUp(self):
        self.env = Environment(dirname(abspath(__file__))+'/../../tests/resources/env1.txt')
        if self.env.width * self.env.height == 0:
            self.fail('The environment has a 0 dimension. Cannot continue')
        self.verbose = True

    def runPlanTest(self, planner):
        time = 0.0
        length = 0.0
        good = 0
        N = 25

        for _ in range(N):
            (result, time, length) = planner.execute(self.env, time, length, False)
            if result:
                good = good + 1

        success = 100.0 * float(good) / float(N)
        avgruntime = time / float(N)
        avglength = length / float(N)

        if self.verbose:
            print('    Success rate: %f%%' % success)
            print('    Average runtime: %f' % avgruntime)
            print('    Average path length: %f' % avglength)

        return (success, avgruntime, avglength)

    def testControl_RRT(self):
        planner = RRTTest()
        (success, avgruntime, avglength) = self.runPlanTest(planner)
        self.assertTrue(success >= 99.0)
        self.assertTrue(avgruntime < 5)
        self.assertTrue(avglength < 100.0)

    def testControl_EST(self):
        planner = ESTTest()
        (success, avgruntime, avglength) = self.runPlanTest(planner)
        self.assertTrue(success >= 99.0)
        self.assertTrue(avgruntime < 5)
        self.assertTrue(avglength < 100.0)

    def testControl_KPIECE1(self):
        planner = KPIECE1Test()
        (success, avgruntime, avglength) = self.runPlanTest(planner)
        self.assertTrue(success >= 99.0)
        self.assertTrue(avgruntime < 2.5)
        self.assertTrue(avglength < 100.0)

    def testControl_SyclopRRT(self):
        planner = SyclopRRTTest()
        (success, avgruntime, avglength) = self.runPlanTest(planner)
        self.assertTrue(success >= 99.0)
        self.assertTrue(avgruntime < 2.5)
        self.assertTrue(avglength < 100.0)

    def testControl_SyclopEST(self):
        planner = SyclopESTTest()
        (success, avgruntime, avglength) = self.runPlanTest(planner)
        self.assertTrue(success >= 99.0)
        self.assertTrue(avgruntime < 2.5)
        self.assertTrue(avglength < 100.0)


def suite():
    suites = (unittest.makeSuite(PlanTest))
    return unittest.TestSuite(suites)

if __name__ == '__main__':
    setLogLevel(LogLevel.LOG_ERROR)
    unittest.main()