#!/usr/bin/env python
# -*- coding: UTF-8 no BOM -*-

import os,sys,string
import numpy as np
from collections import defaultdict
from optparse import OptionParser
import damask

scriptID   = string.replace('$Id$','\n','\\n')
scriptName = scriptID.split()[1][:-3]

# --------------------------------------------------------------------
#                                MAIN
# --------------------------------------------------------------------

parser = OptionParser(option_class=damask.extendableOption, usage='%prog options [file[s]]', description = """
Shift values of scalar, vector, or tensor columns by given offset.

""", version = scriptID)

parser.add_option('-s','--scalar',  dest='scalar', action='extend', metavar='<string LIST>',
                                    help='column heading to shift by scalar')
parser.add_option('-v','--vector',  dest='vector', action='extend', metavar='<string LIST>',
                                    help='column heading to shift by vector')
parser.add_option('-t','--tensor',  dest='tensor', action='extend', metavar='<string LIST>',
                                    help='column heading to shift by tensor')
parser.add_option('-d','--delta',   dest='delta', action='extend', metavar='<float LIST>',
                                    help='list of scalar, vector, and tensor shifts (in this order!)')

parser.set_defaults(scalar = [])
parser.set_defaults(vector = [])
parser.set_defaults(tensor = [])
parser.set_defaults(delta  = [])

(options,filenames) = parser.parse_args()

options.delta = np.array(options.delta,'d')
datainfo = {                                                                                        # list of requested labels per datatype
             'scalar':     {'len':1,
                            'label':[]},
             'vector':     {'len':3,
                            'label':[]},
             'tensor':     {'len':9,
                            'label':[]},
           }

length = 0
if options.scalar != []: datainfo['scalar']['label'] += options.scalar; length += len(options.scalar)*datainfo['scalar']['len']
if options.vector != []: datainfo['vector']['label'] += options.vector; length += len(options.vector)*datainfo['vector']['len']
if options.tensor != []: datainfo['tensor']['label'] += options.tensor; length += len(options.tensor)*datainfo['tensor']['len']
if len(options.delta) != length:
  parser.error('length of offset vector does not match column types...')

# ------------------------------------------ setup file handles ------------------------------------
files = []
if filenames == []:
  files.append({'name':'STDIN', 'input':sys.stdin, 'output':sys.stdout, 'croak':sys.stderr})
else:
  for name in filenames:
    if os.path.exists(name):
      files.append({'name':name, 'input':open(name), 'output':open(name+'_tmp','w'), 'croak':sys.stderr})

# ------------------------------------------ loop over input files ---------------------------------
for file in files:
  if file['name'] != 'STDIN': file['croak'].write('\033[1m'+scriptName+'\033[0m: '+file['name']+'\n')
  else: file['croak'].write('\033[1m'+scriptName+'\033[0m\n')

  table = damask.ASCIItable(file['input'],file['output'],False)                                     # make unbuffered ASCII_table
  table.head_read()                                                                                 # read ASCII header info
  table.info_append(scriptID + '\t' + ' '.join(sys.argv[1:]))

# --------------- figure out columns to process  ---------------------------------------------------
  active = defaultdict(list)
  column = defaultdict(dict)

  for datatype,info in datainfo.items():
    for label in info['label']:
      key = {True :'1_%s',
             False:'%s'   }[info['len']>1]%label
      if key in table.labels:
          active[datatype].append(label)
          column[datatype][label] = table.labels.index(key)                                         # remember columns of requested data
      else:
        file['croak'].write('column %s not found...\n'%label)
       
# ------------------------------------------ assemble header ---------------------------------------
  table.head_write()

# ------------------------------------------ process data ------------------------------------------
  outputAlive = True
  while outputAlive and table.data_read():                                                          # read next data line of ASCII table
    i = 0
    for datatype,labels in sorted(active.items(),key=lambda x:datainfo[x[0]]['len']):               # loop over scalar,vector,tensor
      for label in labels:                                                                          # loop over all requested labels
        for j in xrange(datainfo[datatype]['len']):                                                 # loop over entity elements
          table.data[column[datatype][label]+j] = float(table.data[column[datatype][label]+j]) + options.delta[i]
        i += 1  
    outputAlive = table.data_write()                                                                # output processed line

# ------------------------------------------ output result -----------------------------------------
  outputAlive and table.output_flush()                                                              # just in case of buffered ASCII table

  file['input'].close()                                                                             # close input ASCII table (works for stdin)
  file['output'].close()                                                                            # close output ASCII table (works for stdout)
  if file['name'] != 'STDIN':
    os.rename(file['name']+'_tmp',file['name'])                                                     # overwrite old one with tmp new