# -*- coding: utf-8 -*-
"""An example of using xrt with raycing backend."""
__author__ = "Konstantin Klementiev"
__date__ = "08 Mar 2016"
import os, sys; sys.path.append(os.path.join('..', '..', '..'))  # analysis:ignore
import math
import numpy as np
import matplotlib as mpl

import xrt.backends.raycing as raycing
import xrt.backends.raycing.sources as rs
import xrt.backends.raycing.apertures as ra
import xrt.backends.raycing.oes as roe
import xrt.backends.raycing.run as rr
import xrt.backends.raycing.materials as rm
import xrt.backends.raycing.screens as rsc

import xrt.plotter as xrtp
import xrt.runner as xrtr

E0 = 9000.
eLimits = E0, E0+2.5
prefix = '09_conv_LT_bentSph'

crystalDiamond = rm.CrystalDiamond((1, 1, 1), 2.0592872, elements='C',
                                   geom='Laue transmitted', t=0.05)
#crystalDiamond = rm.CrystalDiamond(
#    (3,1,1), 2.0592872*(3./11)**0.5, elements='C',
#    geom='Laue transmitted', t=0.05)
theta0 = math.asin(rm.ch / (2 * crystalDiamond.d * (E0+1.2)))

yDCM = 21000.
yVFM = 24000.
ySample = 1.5 * yVFM
yQWP = ySample - 3000.


def build_beamline(nrays=raycing.nrays):
    fixedExit = 15.

    beamLine = raycing.BeamLine(azimuth=0, height=0)
    hDiv = 1.5e-3
    vDiv = 2.5e-4
    rs.GeometricSource(
        beamLine, 'GeometricSource', (0, 0, 0),
        nrays=nrays, dx=0.1, dy=0, dz=2., dxprime=hDiv/2, dzprime=0,
        distE='flat', energies=eLimits, polarization='horizontal')

    beamLine.feMovableMaskLT = ra.RectangularAperture(
        beamLine, 'FEMovableMaskLT', [0, 10000, 0], ('left', 'top'), [-10, 3.])
    beamLine.feMovableMaskRB = ra.RectangularAperture(
        beamLine, 'FEMovableMaskRB', [0, 10500, 0], ('right', 'bottom'),
        [10, -3.])
    beamLine.feMovableMaskLT.set_divergence(
        beamLine.sources[0], [-hDiv/2, vDiv/2])
    beamLine.feMovableMaskRB.set_divergence(
        beamLine.sources[0], [hDiv/2, -vDiv/2])

    si111 = rm.CrystalSi(hkl=(1, 1, 1), tK=-171+273.15)
    beamLine.dcm = roe.DCM(
        beamLine, 'DCM', (0, yDCM, 0), surface=('Si111',), material=(si111,))
    beamLine.dcm.bragg = math.asin(rm.ch / (2 * si111.d * E0))
    beamLine.dcm.cryst2perpTransl = fixedExit/2./math.cos(beamLine.dcm.bragg)

    beamLine.fsm1 = rsc.Screen(beamLine, 'FSM1', (0, yDCM + 700, 0))

    beamLine.vfm = roe.ToroidMirror(beamLine, 'VFM', (0, yVFM, fixedExit),
                                    pitch=4e-3)
    beamLine.vfm.R = yVFM / beamLine.vfm.pitch
    beamLine.vfm.r = 2. / 3. * yVFM * beamLine.vfm.pitch
    yFlatMirror = yVFM + 2000.
    zFlatMirror = (yFlatMirror - yVFM) * 2. * beamLine.vfm.pitch + fixedExit
    beamLine.vdm = roe.OE(
        beamLine, 'FlatMirror', (0, yFlatMirror, zFlatMirror),
        pitch=-beamLine.vfm.pitch, positionRoll=math.pi)

    beamLine.qwp = roe.BentLaueSphere(
        beamLine, 'QWP', (0, yQWP, zFlatMirror), roll=math.pi/4,
        material=(crystalDiamond,), R=3000.)
    beamLine.qwp.pitch = theta0 + math.pi/2

    beamLine.fsm2 = rsc.Screen(beamLine, 'FSM2', (0, ySample, zFlatMirror))

    return beamLine


def run_process(beamLine):
    beamSource = beamLine.sources[0].shine()
    beamLine.feMovableMaskLT.propagate(beamSource)
    beamLine.feMovableMaskRB.propagate(beamSource)

    beamDCMglobal, beamDCMlocal1, beamDCMlocal2 = \
        beamLine.dcm.double_reflect(beamSource)
    beamFSM1 = beamLine.fsm1.expose(beamDCMglobal)

    beamVFMglobal, beamVFMlocal = beamLine.vfm.reflect(beamDCMglobal)
    beamVDMglobal, beamVDMlocal = beamLine.vdm.reflect(beamVFMglobal)

    beamQWPglobal, beamQWPlocal = beamLine.qwp.reflect(beamVDMglobal)
    beamFSM2 = beamLine.fsm2.expose(beamQWPglobal)

    outDict = {'beamSource': beamSource,
               'beamDCMglobal': beamDCMglobal,
               'beamDCMlocal1': beamDCMlocal1,
               'beamDCMlocal2': beamDCMlocal2,
               'beamFSM1': beamFSM1,
               'beamVFMglobal': beamVFMglobal,
               'beamVFMlocal': beamVFMlocal,
               'beamVDMglobal': beamVDMglobal,
               'beamVDMlocal': beamVDMlocal,
               'beamQWPglobal': beamQWPglobal,
               'beamQWPlocal': beamQWPlocal,
               'beamFSM2': beamFSM2
               }
    return outDict

rr.run_process = run_process


def define_plots(beamLine):
    dE = beamLine.sources[0].energies[-1] - beamLine.sources[0].energies[0]
    midE = \
        (beamLine.sources[0].energies[-1] + beamLine.sources[0].energies[0])/2
    if dE < midE / 20.:
        fwhmFormatStrE = '%.2f'
        offsetE = E0
    else:
        fwhmFormatStrE = None
        offsetE = 0
    plots = []

#    plot = xrtp.XYCPlot('beamFSM1', (1,),
#      xaxis=xrtp.XYCAxis(r'$x$', 'mm', limits=[-20, 20]),
#      yaxis=xrtp.XYCAxis(r'$z$', 'mm', limits=[-20, 20]),
#      ePos=1, title=beamLine.fsm1.name+'_E')
#    plot.caxis.fwhmFormatStr = fwhmFormatStrE
#    plot.caxis.limits = eLimits
#    plot.caxis.offset = offsetE
#    plot.textPanel = plot.fig.text(
#        0.88, 0.8, '', transform=plot.fig.transFigure,
#        size=14, color='r', ha='center')
#    plots.append(plot)

#    plot = xrtp.XYCPlot('beamVFMlocal', (1,2), aspect='auto',
#      xaxis=xrtp.XYCAxis(r'$x$', 'mm', limits=[-20, 20]),
#      yaxis=xrtp.XYCAxis(r'$y$', 'mm'),
#      title='VFM_footprint')
#    plots.append(plot)

#    plot = xrtp.XYCPlot('beamQWPlocal', (1,2),
#      xaxis=xrtp.XYCAxis(r'$x$', 'mm', limits=[-10, 10]),
#      yaxis=xrtp.XYCAxis(r'$y$', 'mm'),
#      title='QWP_footprint')
#    plots.append(plot)

    plot = xrtp.XYCPlot(
        'beamFSM2', (1,),
        xaxis=xrtp.XYCAxis(r'$x$', 'mm', limits=[-0.15, 0.15]),
        yaxis=xrtp.XYCAxis(r'$z$', 'mm', limits=[-0.15, 0.15]),
        ePos=1, title=beamLine.fsm2.name+'_E')
    plot.caxis.fwhmFormatStr = fwhmFormatStrE
    plot.caxis.limits = eLimits
    plot.caxis.offset = offsetE
    plot.textPanel = plot.fig.text(
        0.88, 0.8, '', transform=plot.fig.transFigure,
        size=14, color='r', ha='center')
    plots.append(plot)

    plot = xrtp.XYCPlot(
        'beamFSM2', (1,),
        xaxis=xrtp.XYCAxis(r'$x$', 'mm', limits=[-0.15, 0.15]),
        yaxis=xrtp.XYCAxis(r'$z$', 'mm', limits=[-0.15, 0.15]),
        caxis=xrtp.XYCAxis('degree of polarization', '',
                           data=raycing.get_polarization_degree,
                           limits=[0, 1]),
        ePos=1, title=beamLine.fsm2.name+'_DegreeOfPol')
    plot.textPanel = plot.fig.text(
        0.88, 0.8, '', transform=plot.fig.transFigure, size=14, color='r',
        ha='center')
    plots.append(plot)

    plot = xrtp.XYCPlot(
        'beamFSM2', (1,),
        xaxis=xrtp.XYCAxis(r'$x$', 'mm', limits=[-0.15, 0.15]),
        yaxis=xrtp.XYCAxis(r'$z$', 'mm', limits=[-0.15, 0.15]),
        caxis=xrtp.XYCAxis('circular polarization rate', '',
                           data=raycing.get_circular_polarization_rate,
                           limits=[-1, 1]),
        ePos=1, title=beamLine.fsm2.name+'_CircPolRate')
    plot.textPanel = plot.fig.text(
        0.88, 0.8, '', transform=plot.fig.transFigure, size=14, color='r',
        ha='center')
    plots.append(plot)

    plot = xrtp.XYCPlot(
        'beamFSM2', (1,),
        xaxis=xrtp.XYCAxis(r'$x$', 'mm', limits=[-0.15, 0.15]),
        yaxis=xrtp.XYCAxis(r'$z$', 'mm', limits=[-0.15, 0.15]),
        caxis=xrtp.XYCAxis('ratio of ellipse axes', '',
                           data=raycing.get_ratio_ellipse_axes,
                           limits=[-1, 1]),
        ePos=1, title=beamLine.fsm2.name+'_PolAxesRatio')
    plot.textPanel = plot.fig.text(
        0.88, 0.8, '', transform=plot.fig.transFigure, size=14, color='r',
        ha='center')
    plots.append(plot)

#    plot = xrtp.XYCPlot('beamFSM2', (1,),
#      xaxis=xrtp.XYCAxis(r'$x$', 'mm', limits=[-0.15, 0.15]),
#      yaxis=xrtp.XYCAxis(r'$z$', 'mm', limits=[-0.15, 0.15]),
#      caxis=xrtp.XYCAxis('angle of polarization ellipse', 'rad',
#      data=raycing.get_polarization_psi, limits=[-math.pi/2, math.pi/2]),
#      ePos=1, title=beamLine.fsm2.name+'_PolPsi')
#    plot.ax1dHistE.set_yticks(
#        (-math.pi/2, -math.pi/4, 0, math.pi/4, math.pi/2))
#    plot.ax1dHistE.set_yticklabels((r'-$\frac{\pi}{2}$', r'-$\frac{\pi}{4}$',
#      '0', r'$\frac{\pi}{4}$', r'$\frac{\pi}{2}$'))
#    plot.textPanel = plot.fig.text(
#        0.88, 0.8, '', transform=plot.fig.transFigure,
#        size=14, color='r', ha='center')
#    plots.append(plot)

    plot = xrtp.XYCPlot(
        'beamFSM2', (1,),
        xaxis=xrtp.XYCAxis(r'$x$', 'mm', limits=[-0.15, 0.15]),
        yaxis=xrtp.XYCAxis(r'$z$', 'mm', limits=[-0.15, 0.15]),
        caxis=xrtp.XYCAxis('phase shift', '',
                           data=raycing.get_phase_shift,
                           limits=[-1, 1]),  # limits are in units of pi!
        ePos=1, title=beamLine.fsm2.name+'_PhaseShift')
    formatter = mpl.ticker.FormatStrFormatter('%g' + r'$ \pi$')
    plot.ax1dHistE.yaxis.set_major_formatter(formatter)
    plot.textPanel = plot.fig.text(
        0.88, 0.8, '', transform=plot.fig.transFigure, size=14, color='r',
        ha='center')
    plots.append(plot)
    return plots


def plot_generator(plots, beamLine):
#    polarization = ['horiz', 'vert', '+45', '-45', 'right', 'left', None]
    polarization = 'horiz',

    crystalDiamond.t = 0.5  # in mm
    posTheta = np.logspace(0, 13, 14, base=2)
    departureTheta = np.hstack((-posTheta[::-1], 0, posTheta))
    Rnominal = ySample - yQWP

    for polar in polarization:
        beamLine.sources[0].polarization = polar
        suffix = polar
        if suffix is None:
            suffix = 'none'
        sq2 = math.sqrt(2)
        for radiusFactor in [2, sq2, 1, 1/sq2, 0.5, np.inf]:
            radius = radiusFactor * Rnominal
            beamLine.qwp.R = radius
            for iTheta, dTheta in enumerate(departureTheta):
                beamLine.qwp.pitch = theta0 + math.pi/2 + \
                    math.radians(dTheta / 3600.)
                for plot in plots:
                    plot.xaxis.fwhmFormatStr = '%.1f'
                    plot.yaxis.fwhmFormatStr = '%.1f'
                    if radiusFactor is np.inf:
                        fileName = '{0}_{1}_{2}_R=inf_{4:02d}.png'.\
                            format(prefix, plot.title, suffix, radius,
                                   iTheta)
                    else:
                        fileName = '{0}_{1}_{2}_R={3:05.0f}mm_{4:02d}.png'\
                            .format(prefix, plot.title, suffix, radius,
                                    iTheta)
                    plot.saveName = fileName
#                    plot.persistentName = fileName + '.pickle'
                    try:
                        if radiusFactor is np.inf:
                            plot.textPanel.set_text(
                                u'{0}\nR = {1}\n{2:+4.0f} arcsec'.
                                format(suffix, r'$\infty$', dTheta))
                        else:
                            plot.textPanel.set_text(
                                u'{0}\nR = {1:5.0f} mm\n{2:+4.0f} arcsec'.
                                format(suffix, radius, dTheta))
                    except AttributeError:
                        pass
                yield


def main():
    beamLine = build_beamline()
    plots = define_plots(beamLine)
    xrtr.run_ray_tracing(
        plots, repeats=24, generator=plot_generator,
        beamLine=beamLine, globalNorm=True, processes='all')

#this is necessary to use multiprocessing in Windows, otherwise the new Python
#contexts cannot be initialized:
if __name__ == '__main__':
    main()
