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

# 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


class myParser(optparse.OptionParser):

    def format_epilog(self, formatter):
        return self.epilog

PARSER = \
    myParser(description='Script to provide a command line interface to an OpenRefine server.',
             usage='usage: %prog [--help | OPTIONS]',
             epilog="""
Examples:
  --list # show list of projects (id: name)
  --list -H 127.0.0.1 -P 80 # specify hostname and port
  --info 2161595260364 # show metadata of project 
  --info "christmas gifts"
  --create example.csv # create new project from file example.csv
  --create example.tsv --encoding=UTF-8
  --create example.xml --recordPath=collection --recordPath=record
  --create example.json --recordPath=_ --recordPath=_
  --create example.xlsx --sheets=0
  --create example.ods --sheets=0
  --apply trim.json 2161595260364 # apply rules in trim.json to project 1234...
  --apply trim.json "christmas gifts"
  --export 2161595260364 > project.tsv # export project 2161595260364 in tsv format
  --export "christmas gifts" > project.tsv
  --export --output=project.xlsx 2161595260364 # export project in xlsx format
  --export --output=project.xlsx "christmas gifts"
  --delete 2161595260364 # delete project 
  --delete "christmas gifts"
""")

group1 = optparse.OptionGroup(PARSER, 'Connection options')
group1.add_option('-H', '--host', dest='host', metavar='127.0.0.1',
                  help='OpenRefine hostname (default: 127.0.0.1)')
group1.add_option('-P', '--port', dest='port', metavar='3333',
                  help='OpenRefine port (default: 3333)')
PARSER.add_option_group(group1)

group2 = optparse.OptionGroup(PARSER, 'Commands')
group2.add_option('-c', '--create', dest='create', metavar='[FILE]',
                  help='Create project from file. The filename ending (e.g. .csv) defines the input format (csv,tsv,xml,json,txt,xls,xlsx,ods)')
group2.add_option('-l', '--list', dest='list', action='store_true',
                  help='List projects')
PARSER.add_option_group(group2)

group3 = optparse.OptionGroup(PARSER, 'Commands with argument [PROJECTID/PROJECTNAME]')
group3.add_option('-d', '--delete', dest='delete', action='store_true',
                  help='Delete project')
group3.add_option('-f', '--apply', dest='apply', metavar='[FILE]',
                  help='Apply JSON rules to OpenRefine project')
group3.add_option('-E', '--export', dest='export', action='store_true',
                  help='Export project in tsv format to stdout.')
group3.add_option('-o', '--output', dest='output', metavar='[FILE]',
                  help='Export project to file. The filename ending (e.g. .tsv) defines the output format (csv,tsv,xls,xlsx,html)')
group3.add_option('--info', dest='info', action='store_true',
                  help='show project metadata')
PARSER.add_option_group(group3)

group4 = optparse.OptionGroup(PARSER, 'Create options')
group4.add_option('--columnWidths', dest='columnWidths',
                  help='(txt/fixed-width) please provide widths separated by comma (e.g. 7,5)')
group4.add_option('--encoding', dest='encoding',
                  help='(csv,tsv,txt), please provide short encoding name (e.g. UTF-8)')
group4.add_option('--guessCellValueTypes', dest='guessCellValueTypes',
                  help='(xml,csv,tsv,txt,json), default: false')
group4.add_option('--headerLines', dest='headerLines',
                  help='(csv,tsv,txt/fixed-width,xls,xlsx,ods), default: 1, default txt/fixed-width: 0')
group4.add_option('--ignoreLines', dest='ignoreLines',
                  help='(csv,tsv,txt,xls,xlsx,ods), default: -1')
group4.add_option('--includeFileSources', dest='includeFileSources',
                  help='(all formats), default: false')
group4.add_option('--limit', dest='limit',
                  help='(all formats), default: -1')
group4.add_option('--linesPerRow', dest='linesPerRow',
                  help='(txt/line-based), default: 1')
group4.add_option('--processQuotes', dest='processQuotes',
                  help='(csv,tsv), default: true')
group4.add_option('--projectName', dest='project_name',
                  help='(all formats), default: filename')
group4.add_option('--recordPath', dest='recordPath', action='append',
                  help='(xml,json), please provide path in multiple arguments without slashes, e.g. /collection/record/ should be entered like this: --recordPath=collection --recordPath=record, default xml: record, default json: _ _')
group4.add_option('--separator', dest='separator',
                  help='(csv,tsv), default csv: , default tsv: \\t')
group4.add_option('--sheets', dest='sheets',
                  help='(xls,xlsx,ods), please provide sheets separated by comma (e.g. 0,1), default: 0 (first sheet)')
group4.add_option('--skipDataLines', dest='skipDataLines',
                  help='(csv,tsv,txt,xls,xlsx,ods), default: 0, default line-based: -1')
group4.add_option('--storeBlankRows', dest='storeBlankRows',
                  help='(csv,tsv,txt,xls,xlsx,ods), default: true')
group4.add_option('--storeBlankCellsAsNulls',
                  dest='storeBlankCellsAsNulls',
                  help='(csv,tsv,txt,xls,xlsx,ods), default: true')
group4.add_option('--storeEmptyStrings', dest='storeEmptyStrings',
                  help='(xml,json), default: true')
group4.add_option('--trimStrings', dest='trimStrings',
                  help='(xml,json), default: false')
PARSER.add_option_group(group4)

group5 = optparse.OptionGroup(PARSER, 'Legacy options')
group5.add_option('--format', dest='input_format',
help='Specify input format (csv,tsv,xml,json,line-based,fixed-width,xls,xlsx,ods)')
PARSER.add_option_group(group5)


def list_projects():
    """Query the OpenRefine 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 info(project):
    projects = refine.Refine(refine.RefineServer()).list_projects().items()
    for project_id, project_info in projects:
        if project == project_id:
            print('{0}: {1}'.format('id', project_id))
            print('{0}: {1}'.format('name', project_info['name']))
            print('{0}: {1}'.format('created', project_info['created']))
            print('{0}: {1}'.format('modified', project_info['modified']))

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:]
        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()


#noinspection PyPep8Naming
def main():
    """Command line interface."""

    # get environment variables in docker network
    docker_host = os.environ.get('OPENREFINE_SERVER_PORT_3333_TCP_ADDR')
    if docker_host:
        os.environ["OPENREFINE_HOST"] = docker_host
        refine.REFINE_HOST = docker_host
    docker_port = os.environ.get('OPENREFINE_SERVER_PORT_3333_TCP_PORT')
    if docker_port:
        os.environ["OPENREFINE_PORT"] = docker_port
        refine.REFINE_PORT = docker_port

    options, args = PARSER.parse_args()
    commands_dict = { group2_arg.dest : getattr(options, group2_arg.dest) for group2_arg in group2.option_list }
    commands_dict.update({ group3_arg.dest : getattr(options, group3_arg.dest) for group3_arg in group3.option_list })
    commands_dict = { k: v for k, v in commands_dict.items() if v != None }
    if not commands_dict:
        PARSER.print_usage()
        return
    if args and not str.isdigit(args[0]):
        projects = refine.Refine(refine.RefineServer()).list_projects().items()
        idlist = []
        for project_id, project_info in projects:
            if args[0] == project_info['name']:
                idlist.append(str(project_id))
        if len(idlist) > 1:
            raise Exception('Found at least two projects. Please specify project by id.')
        else:
            args[0] = idlist[0]

    if options.host:
        refine.REFINE_HOST = options.host
    if options.port:
        refine.REFINE_PORT = options.port
    if options.list:
        list_projects()
    if options.create:
        # general defaults are defined in google/refine/refine.py new_project
        # additional defaults for each file type
        defaults = {}
        defaults['xml'] = { 'project_format' : 'text/xml', 'recordPath' : 'record' }
        defaults['csv'] = { 'project_format' : 'text/line-based/*sv', 'separator' : ',' }
        defaults['tsv'] = { 'project_format' : 'text/line-based/*sv', 'separator' : '\t' }
        defaults['line-based'] = { 'project_format' : 'text/line-based', 'skipDataLines' : -1 }
        defaults['fixed-width'] = { 'project_format' : 'text/line-based/fixed-width', 'headerLines' : 0 }
        defaults['json'] = { 'project_format' : 'text/json', 'recordPath' : ('_', '_') }
        defaults['xls'] = { 'project_format' : 'binary/text/xml/xls/xlsx', 'sheets' : 0 }
        defaults['xlsx'] = { 'project_format' : 'binary/text/xml/xls/xlsx', 'sheets' : 0 }
        defaults['ods'] = { 'project_format' : 'text/xml/ods', 'sheets' : 0 }
        # guess format from file extension (or legacy option --format)
        input_format = os.path.splitext(options.create)[1][1:].lower()
        if input_format == 'txt' and options.columnWidths:
            input_format = 'fixed_width'
        if input_format == 'txt' and not options.columnWidths:
            input_format = 'line_based'
        if options.input_format:
            input_format = options.input_format
        # defaults for selected format
        input_dict = defaults[input_format]
        # user input
        input_user = { group4_arg.dest : getattr(options, group4_arg.dest) for group4_arg in group4.option_list }
        input_user = { k: v for k, v in input_user.items() if v != None }
        # merge defaults with user input
        input_dict.update(input_user)
        input_dict['project_file'] = options.create
        print(input_dict)
        refine.Refine(refine.RefineServer()).new_project(**input_dict)
    if options.delete:
        refine.RefineProject(refine.RefineServer(),args[0]).delete()
    if options.apply:
        project = refine.RefineProject(args[0])
        response = project.apply_operations(options.apply)
        if response != 'ok':
            print >> sys.stderr, 'Failed to apply %s: %s' \
                % (options.apply, response)
    if options.export or options.output:
        project = refine.RefineProject(args[0])
        export_project(project, options)
        return project
    if options.info:
        info(args[0])

if __name__ == '__main__':
    # return project so that it's available interactively, python -i refine.py
    refine_project = main()