#!/usr/bin/env python
#
############################################################################
#
# MODULE:	i.signature.remove
# AUTHOR(S):	Luca Delucchi
#
# PURPOSE:	Removes signature file from a group/subgroup
# COPYRIGHT:	(C) 2018 by the GRASS Development Team
#
#		This program is free software under the GNU General Public
#		License (>=v2). Read the file COPYING that comes with GRASS
#		for details.
#
#############################################################################

#%module
#% description: Removes signature file in a group/subgroup.
#% keyword: imagery
#% keyword: map management
#% keyword: remove
#% keyword: signature
#% keyword: group
#%end

#%flag
#% key: f
#% description: Force removal (required for actual deletion of files)
#%end

#%option G_OPT_I_GROUP
#% description: Group used to print signature file
#% required : no
#%end

#%option G_OPT_I_SUBGROUP 
#% description: Subroup used to print signature file
#% required : no
#%end

#%option
#% key: signature
#% type: string
#% gisprompt: old,sig,sigfile
#% label: Input signature file
#% description: The name of the input signature file to copy
#% multiple: yes
#% required: yes
#%end

import os
import sys
import grass.script as grass

def main():
    group = options['group']
    sub = options['subgroup']
    signs = options['signature']
    rem = flags['f']

    gisenv = grass.gisenv()

    try:
        name, mapset = group.split('@', 1)
    except ValueError:
        name = group
        mapset = gisenv['MAPSET']
    
    output_str = "The following signature files would be deleted:\n"
    for sign in signs.split(','):
        path = os.path.join(gisenv['GISDBASE'], gisenv['LOCATION_NAME'])
        path = os.path.join(path, mapset, 'group', name, 'subgroup', sub,
                            'sig', sign)
        if not os.path.exists(path):
            grass.fatal(_("Signature file <{pa}> does not exist for group "
                          "<{gr}> and subgroup <{su}>".format(pa=sign,
                                                              gr=group,
                                                              su=sub)))
        if rem:
            try:
                os.remove(path)
                print(_("Removing signature file <{si}>".format(si=sign)))
            except:
                grass.warning(_("Signature file <{pa}> was not "
                                "removed".format(pa=sign)))
        else:
            output_str += "{gr}/{su}/{sig}\n".format(gr=group, su=sub,
                                                     sig=sign)
    
    if not rem:
        print(output_str.rstrip())
        grass.warning(_("Nothing removed. You must use the force flag (-f) "
                        "to actually remove them. Exiting."))

if __name__ == "__main__":
    options, flags = grass.parser()
    sys.exit(main())