#!/usr/bin/env python
"""
Script to provide a command line interface to a Refine server.

Examples,

refine --list    # show list of Refine projects, ID: name
refine --export 1234... > project.tsv
refine --export --output=project.xls 1234...
refine --apply trim.json 1234...
"""

# Copyright (c) 2011 Paul Makepeace, Real Programmers. All rights reserved.

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>


import optparse
import os
import sys
import time

from google.refine import refine


PARSER = optparse.OptionParser(usage='usage: %prog [OPTIONS] [project ID/URL]')
PARSER.add_option('-H', '--host', dest='host',
                  help='Google Refine hostname')
PARSER.add_option('-P', '--port', dest='port',
                  help='Google Refine port')
PARSER.add_option('-o', '--output', dest='output',
                  help='Output filename')
# Options that are more like commands
PARSER.add_option('-l', '--list', dest='list', action='store_true',
                  help='List projects')
PARSER.add_option('-E', '--export', dest='export', action='store_true',
                  help='Export project')
PARSER.add_option('-f', '--apply', dest='apply',
                  help='Apply a JSON commands file to a project')

def list_projects():
    """Query the Refine server and list projects by ID: name."""
    projects = refine.Refine(refine.RefineServer()).list_projects().items()
    def date_to_epoch(json_dt):
        "Convert a JSON date time into seconds-since-epoch."
        return time.mktime(time.strptime(json_dt, '%Y-%m-%dT%H:%M:%SZ'))
    projects.sort(key=lambda v: date_to_epoch(v[1]['modified']), reverse=True)
    for project_id, project_info in projects:
        print('{0:>14}: {1}'.format(project_id, project_info['name']))

def export_project(project, options):
    """Dump a project to stdout or options.output file."""
    export_format = 'tsv'
    if options.output:
        ext = os.path.splitext(options.output)[1][1:]     # 'xls'
        if ext:
            export_format = ext.lower()
        output = open(options.output, 'wb')
    else:
        output = sys.stdout
    output.writelines(project.export(export_format=export_format))
    output.close()

def main():
    "Main."
    options, args = PARSER.parse_args()

    if options.host:
        refine.REFINE_HOST = options.host
    if options.port:
        refine.REFINE_PORT = options.port

    if not options.list and len(args) != 1:
        PARSER.error('expecting --list or project ID/URL')
    if options.list:
        list_projects()
    else:
        project = refine.RefineProject(args[0])
        if options.apply:
            response = project.apply_operations(options.apply)
            if response != 'ok':
                print >>sys.stderr, 'Failed to apply %s: %s' % (options.apply,
                                                                response)
        if options.export:
            export_project(project, options)


if __name__ == '__main__':
    main()