#!/usr/bin/env python

# Copyright (C) 2011 Atsushi Togo
# All rights reserved.
#
# This file is part of phonopy.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# * Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in
#   the documentation and/or other materials provided with the
#   distribution.
#
# * Neither the name of the phonopy project nor the names of its
#   contributors may be used to endorse or promote products derived
#   from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

# Displacement manager ( dispmanager )
#
# Usage:
#   dispmanager disp.yaml

import sys, os
import numpy as np
from phonopy.structure.atoms import Atoms
import phonopy.interface.vasp as vasp
import phonopy.hphonopy.file_IO as file_IO

try:
    import yaml
except ImportError:
    print "You need to install python-yaml."
    exit(1)
    
try:
    from yaml import CLoader as Loader
    from yaml import CDumper as Dumper
except ImportError:
    from yaml import Loader, Dumper

# Parse options
from optparse import OptionParser
parser = OptionParser()
parser.set_defaults( output_filename = None,
                     is_overwrite = False,
                     is_create_structure_file = False,
                     is_compatibility = False,
                     is_d2d = False,
                     add_disp = None,
                     select_disp = None,
                     amplitude = 0.01 )
parser.add_option("-o", "--output", dest="output_filename",
                  action="store", type="string",
                  help="Output filename")
parser.add_option("--overwrite", dest="is_overwrite",
                  action="store_true", help="Overwrite input file")
parser.add_option("-w", dest="is_create_structure_file",
                  action="store_true", help="Create structure files")
parser.add_option("-a", "--add", dest="add_disp",
                  action="store", type="string",
                  help="Direction of added displacement")
parser.add_option("-s", "--select", dest="select_disp",
                  action="store", type="string",
                  help="Select displacements and write input file")
parser.add_option("--amplitude", dest="amplitude", type="float",
                  help="Amplitude of displacement")
parser.add_option("--compatibility", dest="is_compatibility",
                  action="store_true", help="Check if disp.yaml is equivalent to old DISP")
parser.add_option("--d2d", dest="is_d2d",
                  action="store_true", help="Show the order of calculated files for disp.yaml")
(options, args) = parser.parse_args()

if len( args ) > 0:
    filename = args[0]
else:
    filename = 'disp.yaml'

if os.path.exists(filename):
    disp = yaml.load( open( filename ).read(), Loader=Loader )
else:
    print "%s could not be found." % filename
    sys.exit(1)
    
natom = disp['natom']
displacements = []
directions = []
for x in disp['displacements']:
    atom = x['atom'] - 1
    d = x['displacement']
    displacements.append([ atom, d[0], d[1], d[2] ])
    d = x['direction']
    directions.append([ atom, d[0], d[1], d[2] ])
lattice = disp['lattice']
positions = [ x['position'] for x in disp['atoms'] ]
symbols = [ x['symbol'] for x in disp['atoms'] ]
cell = Atoms( cell=lattice,
              scaled_positions=positions,
              symbols=symbols,
              pbc=True )

######################
# Create DPOSCAR-xxx #
######################
if options.is_create_structure_file:
    for i, disp in enumerate( displacements ):
        positions = cell.get_positions()
        positions[disp[0]] += disp[1:4]
        vasp.write_vasp( "%s-%03d" % ( "DPOSCAR", i+1 ),
                         Atoms( numbers = cell.get_atomic_numbers(),
                                masses = cell.get_masses(),
                                positions = positions,
                                cell = cell.get_cell(),
                                pbc = True ), direct=True )
    sys.exit(0)

######################
# Check DISP         #
######################
if options.is_compatibility:
    directions_DISP = file_IO.parse_DISP()
    if not len( directions_DISP ) == len( directions ):
        print "disp.yaml and DISP are inconsistent."
        sys.exit(1)
    print "     DISP               disp.yaml"
    for d_DISP, d in zip( directions_DISP, directions ):
        if not d_DISP[0] == d[0]:
            print "disp.yaml and DISP are inconsistent."
            sys.exit(1)
        if ( abs( np.array( d_DISP[1:4] ) - np.array( d[1:4] ) ) < 0.0001 ).all():
            print d_DISP, d
        else:
            print "disp.yaml and DISP are inconsistent."
            sys.exit(1)
    print "diap.yaml and DISP are equivalent!"
    sys.exit(0)

#######################################
# Arrange order in DISP for disp.yaml #
#######################################
if options.is_d2d:
    numbers = ""
    count = 0
    directions_DISP = file_IO.parse_DISP()
    for i, d in enumerate( directions ):
        is_found = False
        for j, d_DISP in enumerate( directions_DISP ):
            if d_DISP[0] == d[0] and ( abs( np.array( d_DISP[1:4] ) - np.array( d[1:4] ) ) < 0.0001 ).all():
                numbers += "%03d," % (j+1)
                count += 1
                is_found = True
                break
        if not is_found:
            print "disp.yaml and DISP are inconsistent."
            sys.exit(1)

    print numbers
    print count
    sys.exit(0)

####################
# Modify disp.yaml #
####################
if options.is_overwrite:
    output_filename=filename
else:
    output_filename=options.output_filename

# Add displacements
if not options.add_disp == None:

    if output_filename==None:
        print "Output filename (-o or --overwrite) is required."
        sys.exit(1)
        
    print options.add_disp.split()[1:4]
    v = np.array( [ float(x) for x in options.add_disp.split()[1:4] ] )
    v = np.dot( v, cell.get_cell() )
    v = v / np.linalg.norm(v) * options.amplitude
    d = [ int( options.add_disp.split()[0] )-1, v[0], v[1], v[2] ]
    displacements.append(d)
    directions.append( [ float(x) for x in options.add_disp.split() ] )

    file_IO.write_disp_yaml( displacements, cell, directions=directions,
                             filename=output_filename )
    sys.exit(0)

# Select displacements
if not options.select_disp == None:

    if output_filename==None:
        print "Output filename (-o or --overwrite) is required."
        sys.exit(1)
        
    disp_selected = []
    direction_selected = []
    for x in options.select_disp.split():
        disp_selected.append( displacements[ int(x)-1 ] )
        direction_selected.append( directions[ int(x)-1 ] )
    file_IO.write_disp_yaml( disp_selected,
                             cell,
                             directions=direction_selected,
                             filename=output_filename )
    sys.exit(0)

print "Nothing has been done."