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

import os,re,sys,string,fnmatch,math,random,numpy as np
from optparse import OptionParser
import damask

scriptID = '$Id$'
scriptName = os.path.splitext(scriptID.split()[1])[0]

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

parser = OptionParser(option_class=damask.extendableOption, usage='%prog options [file[s]]', description = """
Filter rows according to condition and columns by either white or black listing.

Examples:
Every odd row if x coordinate is positive -- " #ip.x# >= 0.0 and #_row_#%2 == 1 ).
All rows where label 'foo' equals 'bar' -- " #foo# == \"bar\" "

""", version = scriptID)

parser.add_option('-w','--white',
                  dest   = 'whitelist',
                  action = 'extend', metavar = '<string LIST>',
                  help   = 'whitelist of column labels (a,b,c,...)')
parser.add_option('-b','--black',
                  dest   = 'blacklist',
                  action = 'extend', metavar='<string LIST>',
                  help   = 'blacklist of column labels (a,b,c,...)')
parser.add_option('-c','--condition',
                  dest   = 'condition', metavar='string',
                  help   = 'condition to filter rows')

parser.set_defaults(condition = '',
                   )

(options,filenames) = parser.parse_args()

# --- loop over input files -------------------------------------------------------------------------

if filenames == []: filenames = ['STDIN']

for name in filenames:
  if not (name == 'STDIN' or os.path.exists(name)): continue
  table = damask.ASCIItable(name = name, outname = name+'_tmp',
                            buffered = False)
  table.croak('\033[1m'+scriptName+'\033[0m'+(': '+name if name != 'STDIN' else ''))

# ------------------------------------------ assemble info ---------------------------------------  

  table.head_read()
  table.info_append(scriptID + '\t' + ' '.join(sys.argv[1:]))                                                                                # read ASCII header info

# ------------------------------------------ process data ---------------------------------------  

  specials = { \
               '_row_': 0,
             }
  labels = []
  positions = []

  for position,label in enumerate(table.labels):
    if    (options.whitelist == None or     any([   position in table.label_indexrange(needle) \
                                                 or fnmatch.fnmatch(label,needle) for needle in options.whitelist])) \
      and (options.blacklist == None or not any([   position in table.label_indexrange(needle) \
                                                 or fnmatch.fnmatch(label,needle) for needle in options.blacklist])):  # a label to keep?
      labels.append(label)                                                                          # remember name...
      positions.append(position)                                                                    # ...and position

  if len(labels) > 0 and options.whitelist != None and options.blacklist == None:                   # check whether reordering is possible
    position = np.zeros(len(labels))
    for i,label in enumerate(labels):                                                               # check each selected label
      match = [   positions[i] in table.label_indexrange(needle) \
               or fnmatch.fnmatch(label,needle) for needle in options.whitelist]                       # which whitelist items do match it
      position[i] = match.index(True) if np.sum(match) == 1 else -1                                 # unique match --> store which

    sorted = np.lexsort((labels,position))
    order = range(len(labels)) if sorted[0] < 0 else sorted                                         # skip reordering if non-unique, i.e. first sorted is "-1"
  else:
    order = range(len(labels))                                                                      # maintain original order of labels
  
  interpolator = []
  condition = options.condition                                                                     # copy per file, might be altered
  for position,operand in enumerate(set(re.findall(r'#(([s]#)?(.+?))#',condition))):                # find three groups
    condition = condition.replace('#'+operand[0]+'#',
                                          {  '': '{%i}'%position,
                                           's#':'"{%i}"'%position}[operand[1]])
    if operand[2] in specials:                                                                      # special label ?
      interpolator += ['specials["%s"]'%operand[2]]
    else:
      try:
        interpolator += ['%s(table.data[%i])'%({  '':'float',
                                                's#':'str'}[operand[1]],
                                               table.labels.index(operand[2]))]
      except:
        parser.error('column %s not found...\n'%operand[2])

  evaluator = "'" + condition + "'.format(" + ','.join(interpolator) + ")"
  
# ------------------------------------------ assemble header ---------------------------------------

  table.labels_clear()
  table.labels_append(np.array(labels)[order])                                                      # update with new label set
  table.head_write()

# ------------------------------------------ process and output data ------------------------------------------

  positions = np.array(positions)[order]
  outputAlive = True
  while outputAlive and table.data_read():                                                          # read next data line of ASCII table
    specials['_row_'] += 1                                                                          # count row
    if condition == '' or eval(eval(evaluator)):                                                    # valid row ?
      table.data = [table.data[position] for position in positions]                                 # retain filtered columns
      outputAlive = table.data_write()                                                              # output processed line

# ------------------------------------------ finalize output -----------------------------------------

  table.close()                                                                                     # close input ASCII table (works for stdin)

  if name != 'STDIN': os.rename(name+'_tmp',name)                                                   # overwrite old one with tmp new