#!/usr/bin/env python3

import os
import sys
import numpy as np
import phoebe
import rebound

from phoebe import u
from phoebe import c

from phoebe.parameters import hierarchy as _hierarchy

deg = np.pi/180.0
atol = 4.0e-16

def default_twopairs():

    b = phoebe.Bundle()

    b.add_star(component='starA', color='red')
    b.add_star(component='starB', color='green')
    b.add_star(component='starC', color='blue')
    b.add_star(component='starD', color='cyan')

    # THIS DOES NOT WORK, BECAUSE...
    b.add_orbit(component='orbit1')
    b.add_orbit(component='orbit2')
    b.add_orbit(component='orbit3')

    # ... NO CONTRAINTS => NEED TO SET UP SMA MANUALLY
    b.set_value('mass@starA@component', value=1.0)
    b.set_value('mass@starB@component', value=1.0)
    b.set_value('mass@starC@component', value=1.0)
    b.set_value('mass@starD@component', value=1.0)
    b.set_value('period@orbit1@component', value=1.0)
    b.set_value('period@orbit2@component', value=1.5)
    b.set_value('period@orbit3@component', value=100.0)
    b.set_value('sma@orbit1@component', value=5.3)
    b.set_value('sma@orbit2@component', value=1.5*5.3)
    b.set_value('sma@orbit3@component', value=100.0)

    b.run_delayed_constraints()

    hier1 = _hierarchy.binaryorbit(b['orbit1'], b['starA'], b['starB'])
    hier2 = _hierarchy.binaryorbit(b['orbit2'], b['starC'], b['starD'])
    hier3 = _hierarchy.binaryorbit(b['orbit3'], hier1, hier2)

    b.set_hierarchy(hier3)

#    b.add_constraint(phoebe.parameters.constraint.keplers_third_law_hierarchical, 'orbit2', 'orbit1')
#    b.add_constraint(phoebe.parameters.constraint.keplers_third_law_hierarchical, 'orbit3', 'orbit2')

    b.add_compute()

    return b

def test_xyz_twopairs(verbose=False):
    """
    Test of twopairs geometry.

    """

    # to re-compute default_triple()
    phoebe.conf.devel_on()

    dir_ = os.path.dirname(os.path.realpath(__file__))

    times = np.arange(0.0, 2.0+atol, 0.01)

    # rebound
    b2 = default_twopairs()

    if verbose:
        print("q1 = ", b2['q@orbit1'].value)
        print("q2 = ", b2['q@orbit2'].value)
        print("q3 = ", b2['q@orbit3'].value)
        print("m1 = ", b2['mass@starA@component'].value)
        print("m2 = ", b2['mass@starB@component'].value)
        print("m3 = ", b2['mass@starC@component'].value)
        print("m4 = ", b2['mass@starD@component'].value)
        print("period1 = ", b2['period@orbit1@component'].value)
        print("period2 = ", b2['period@orbit2@component'].value)
        print("period3 = ", b2['period@orbit3@component'].value)
        print("sma1 = ", b2['sma@orbit1@component'].value)
        print("sma2 = ", b2['sma@orbit2@component'].value)
        print("sma3 = ", b2['sma@orbit3@component'].value)

        hier = b2.get_hierarchy()
        print("hier = ", hier)
        print("hier.get_orbits() = ", hier.get_orbits())

    b2.set_value('requiv@starA@component', value=2.0)
    b2.set_value('requiv@starB@component', value=2.0)
    b2.set_value('requiv@starC@component', value=2.0)
    b2.set_value('requiv@starD@component', value=2.0)

    b2.add_compute(dynamics_method='xyz', integrator='ias15', geometry='twopairs')

    b2.set_value('ntriangles@starA@phoebe02', context='compute', value=1000)
    b2.set_value('ntriangles@starB@phoebe02', context='compute', value=1000)
    b2.set_value('ntriangles@starC@phoebe02', context='compute', value=1000)
    b2.set_value('ntriangles@starD@phoebe02', context='compute', value=1000)

#    times = [0.25]
#    b2.add_dataset('mesh', compute_times=times, columns=['visibilities'], dataset='mesh01')
#    b2.run_compute(compute='phoebe02')
#    fig, plt = b2.plot(fc='visibilities', ec='None', y='vs', show=True, figsize=(11,4))
#    plt.savefig("mesh.png", dpi=300)
#    sys.exit(1)

    times, fluxes, sigmas = np.loadtxt('Lc.dat', usecols=(0,1,2), unpack=True)
    b2.add_dataset(kind='lc', times=times, fluxes=fluxes, sigmas=sigmas)

    b2.run_compute(compute='phoebe02')

    f = open('twigs.txt', 'w')
    for twig in b2.twigs:
      f.write("%s\n" % (twig))
    f.close()

    times = b2['times@lc01@phoebe02@latest@lc@model'].value
    fluxes = b2['fluxes@lc01@phoebe02@latest@lc@model'].value

    f = open("lc.dat", "w")
    f.write("# times fluxes\n")
    for i in range(len(times)):
        f.write("%23.16e %23.16e\n" % (times[i], fluxes[i]))
    f.close()

#    fig, plt = b2.plot(show=True)
#    plt.savefig("lc.png")

if __name__ == "__main__":
    logger = phoebe.logger(clevel='INFO')
#    logger = phoebe.logger(clevel='DEBUG')

    test_xyz_twopairs(verbose=True)