#!/usr/bin/env python2.7
# -*- coding: UTF-8 no BOM -*-

import os,sys,math
import numpy as np
from optparse import OptionParser
import damask

scriptName = os.path.splitext(os.path.basename(__file__))[0]
scriptID   = ' '.join([scriptName,damask.version])

#--------------------------------------------------------------------------------------------------
#                                MAIN
#--------------------------------------------------------------------------------------------------
parser = OptionParser(option_class=damask.extendableOption, usage='%prog options [file[s]]', description = """
Generate geometry description and material configuration from input files used by R.A. Lebensohn.

""", version = scriptID)

parser.add_option('--column',          dest='column', type='int', metavar = 'int',
                  help='data column to discriminate between both phases [%default]')
parser.add_option('-t','--threshold',      dest='threshold', type='float', metavar = 'float',
                  help='threshold value for phase discrimination [%default]')
parser.add_option('--homogenization', dest='homogenization', type='int', metavar = 'int',
                  help='homogenization index for <microstructure> configuration [%default]')
parser.add_option('--phase', dest='phase', type='int', nargs = 2, metavar = 'int int',
                  help='phase indices for <microstructure> configuration %default')
parser.add_option('--crystallite', dest='crystallite', type='int', metavar = 'int',
                  help='crystallite index for <microstructure> configuration [%default]')
parser.add_option('--compress',            dest='compress', action='store_true',
                  help='lump identical microstructure and texture information [%default]')
parser.add_option('-p', '--precision',    dest='precision', choices=['0','1','2','3'], metavar = 'int',
                  help = 'euler angles decimal places for output format and compressing {0,1,2,3} [2]')

parser.set_defaults(column         = 7)
parser.set_defaults(threshold      = 1.0)
parser.set_defaults(homogenization = 1)
parser.set_defaults(phase          = [1,2])
parser.set_defaults(crystallite    = 1)
parser.set_defaults(config         = False)
parser.set_defaults(compress       = False)
parser.set_defaults(precision      = '2')

(options,filenames) = parser.parse_args()

if filenames == []: filenames = [None]

for name in filenames:
  try:
    table = damask.ASCIItable(name = name,
                              outname = os.path.splitext(name)[-2]+'.geom' if name else name,
                              buffered = False,
                              labeled = False)
  except: continue
  damask.util.report(scriptName,name)

  info = {
          'grid':   np.zeros(3,'i'),
          'size':   np.zeros(3,'d'),
          'origin': np.zeros(3,'d'),
          'microstructures': 0,
          'homogenization':  options.homogenization
         }
         
  coords = [{},{},{}]
  pos = {'min':[ float("inf"), float("inf"), float("inf")],
         'max':[-float("inf"),-float("inf"),-float("inf")]}

  phase =       []
  eulerangles = []
  outputAlive = True

# ------------------------------------------ process data ------------------------------------------
  while outputAlive and table.data_read():
    if table.data != []:
      currPos = table.data[3:6]
      for i in range(3):
        coords[i][currPos[i]] = True
      currPos = map(float,currPos)
      for i in range(3):
        pos['min'][i] = min(pos['min'][i],currPos[i])
        pos['max'][i] = max(pos['max'][i],currPos[i])
      eulerangles.append(map(math.degrees,map(float,table.data[:3])))
      phase.append(options.phase[int(float(table.data[options.column-1]) > options.threshold)])
      
# --------------- determine size and grid ---------------------------------------------------------
  info['grid'] = np.array(map(len,coords),'i')
  info['size'] = info['grid']/np.maximum(np.ones(3,'d'),info['grid']-1.0)* \
                       np.array([pos['max'][0]-pos['min'][0],
                                 pos['max'][1]-pos['min'][1],
                                 pos['max'][2]-pos['min'][2]],'d')
  eulerangles = np.array(eulerangles,dtype='f').reshape(info['grid'].prod(),3)
  phase       = np.array(phase,dtype='i').reshape(info['grid'].prod())

  limits = [360,180,360]
  if any([np.any(eulerangles[:,i]>=limits[i]) for i in [0,1,2]]):
    damask.util.croak.write('Error: euler angles out of bound. Ang file might contain unidexed poins.\n')
    for i,angle in enumerate(['phi1','PHI','phi2']):
      for n in np.nditer(np.where(eulerangles[:,i]>=limits[i]),['zerosize_ok']):
        damask.util.croak.write('%s in line %i (%4.2f %4.2f %4.2f)\n'
                                     %(angle,n,eulerangles[n,0],eulerangles[n,1],eulerangles[n,2]))
    continue
  eulerangles=np.around(eulerangles,int(options.precision))                                         # round to desired precision
# ensure, that rounded euler angles are not out of bounds (modulo by limits)
  for i,angle in enumerate(['phi1','PHI','phi2']):
    eulerangles[:,i]%=limits[i]                                                                     

# scale angles by desired precision and convert to int. create unique integer key from three euler angles by
# concatenating the string representation with leading zeros and store as integer and search unique euler angle keys.
# Texture IDs are the indices of the first occurrence, the inverse is used to construct the microstructure
# create a microstructure (texture/phase pair) for each point using unique texture IDs.
# Use longInt (64bit, i8) because the keys might be long
  if options.compress:
    formatString='{0:0>'+str(int(options.precision)+3)+'}'
    euleranglesRadInt = (eulerangles*10**int(options.precision)).astype('int')
    eulerKeys = np.array([int(''.join(map(formatString.format,euleranglesRadInt[i,:]))) \
                                                             for i in range(info['grid'].prod())])
    devNull, texture, eulerKeys_idx = np.unique(eulerKeys, return_index = True, return_inverse=True)
    msFull = np.array([[eulerKeys_idx[i],phase[i]] for i in range(info['grid'].prod())],'i8')
    devNull,msUnique,matPoints = np.unique(msFull.view('c16'),True,True)
    matPoints+=1
    microstructure = np.array([msFull[i] for i in msUnique])                                        # pick only unique microstructures
  else:
    texture = np.arange(info['grid'].prod())
    microstructure = np.hstack( zip(texture,phase) ).reshape(info['grid'].prod(),2)                 # create texture/phase pairs
  formatOut = 1+int(math.log10(len(texture)))

  config_header = []

  formatwidth = 1+int(math.log10(len(microstructure)))
  config_header += ['<microstructure>']
  for i in range(len(microstructure)):
    config_header += ['[Grain%s]'%str(i+1).zfill(formatwidth),
                       'crystallite\t%i'%options.crystallite,
                       '(constituent)\tphase %i\ttexture %i\tfraction 1.0'%(microstructure[i,1],microstructure[i,0]+1)
                      ]
  config_header += ['<texture>']

  eulerFormatOut='%%%i.%if'%(int(options.precision)+4,int(options.precision))
  outStringAngles='(gauss) phi1 '+eulerFormatOut+' Phi '+eulerFormatOut+' phi2 '+eulerFormatOut+' scatter 0.0 fraction 1.0'
  for i in range(len(texture)):
    config_header +=    ['[Texture%s]'%str(i+1).zfill(formatOut),
                          outStringAngles%tuple(eulerangles[texture[i],...])
                        ]

  table.labels_clear()
  table.info_clear()

  info['microstructures'] = len(microstructure)

#--- report ---------------------------------------------------------------------------------------
  damask.util.croak('grid     a b c:  %s\n'%(' x '.join(map(str,info['grid']))) +
                    'size     x y z:  %s\n'%(' x '.join(map(str,info['size']))) +
                    'origin   x y z:  %s\n'%(' : '.join(map(str,info['origin']))) +
                    'homogenization:  %i\n'%info['homogenization'] +
                    'microstructures: %i\n\n'%info['microstructures'])

  if np.any(info['grid'] < 1):
    damask.util.croak('invalid grid a b c.\n')
    continue
  if np.any(info['size'] <= 0.0):
    damask.util.croak('invalid size x y z.\n')
    continue


#--- write data -----------------------------------------------------------------------------------
  table.info_append([' '.join([scriptID] + sys.argv[1:]),
                     "grid\ta %i\tb %i\tc %i"%(info['grid'][0],info['grid'][1],info['grid'][2],),
                     "size\tx %f\ty %f\tz %f"%(info['size'][0],info['size'][1],info['size'][2],),
                     "origin\tx %f\ty %f\tz %f"%(info['origin'][0],info['origin'][1],info['origin'][2],),
                     "microstructures\t%i"%info['microstructures'],
                     "homogenization\t%i"%info['homogenization'],
                     config_header
                    ])
  table.head_write()
  if options.compress:
    table.data = matPoints.reshape(info['grid'][1]*info['grid'][2],info['grid'][0])
    table.data_writeArray('%%%ii'%(formatwidth),delimiter=' ')
  else:
    table.data = ["1 to %i\n"%(info['microstructures'])]
  
# ------------------------------------------ output finalization -----------------------------------  

  table.close()