# -*- coding: utf-8 -*-

# Script to create Git repositories in a group from a list of names and
# email addresses in a CSV file (such as exported from SynapseS).
#
# Minimally tested.  Seems to work.  Use at your own risk.
#
# By James Eagan <james.eagan@telecom-paris.fr>
# https://james.eagan.fr

import csv
import gitlab
import sys

GITLAB_URL='https://gitlab.telecom-paris.fr'

def readNames(fileName): 
    result = []
    with open(fileName) as fd:
        sneakPeek = fd.read(1024)
        fd.seek(0)
        sniffer = csv.Sniffer()
        dialect = sniffer.sniff(sneakPeek)
        hasHeader = sniffer.has_header(sneakPeek)
        
        reader = csv.reader(fd, dialect)
        # reader = csv.reader(fd, delimiter=';')
        if hasHeader:
            next(reader)
        for row in reader:
            result.append((row[0], row[1], row[2], row[3]))
    return result

def lookupUser(email, gitlab):
    """ Return the first found user; throw if not found """
    matches = gitlab.users.list(search=email)
    if len(matches) == 1:
        return matches[0]
    raise IndexError("Found {} matching users".format(len(matches)))

def createProject(name, groupId, gitlab):
    return gitlab.projects.create({'name': name, 
                                   'namespace_id': groupId})

def addProjectMember(project, userId, accessLevel):
    return project.members.create({'user_id': userId, 
                                   'access_level': accessLevel})

def makeProjectsInGroupId(groupId, csvFile, token, options={}):
    # print(groupId, csvFile, options)
    api = gitlab.Gitlab(GITLAB_URL, token)
    for (lastName, firstName, email, login) in readNames(csvFile):
        try:
            user = lookupUser(f"{lastName} {firstName}", api)
            
            print("::: {}Creating project for {} {} <{}> -- {} ({})…".format(
                                    "Not " if options.dry_run else "",
                                    lastName, firstName, email, user.name, user.id))
            if options.dry_run:
                continue
            
            project = createProject('{} {}'.format(lastName, firstName), 
                                    groupId, api)
            member = addProjectMember(project, user.id,
                                      gitlab.MAINTAINER_ACCESS)
        except IndexError as e:
            print("!!! Skipping {}: User not found ({})".format(email, e), file=sys.stderr)
        except Exception as e:
            # print("!!! Could not create user for {}: {}".format(email, e), file=sys.stderr)
            print("!!! Error creating project for {}: {}".format(email, e), file=sys.stderr)

if __name__ == '__main__':
    import argparse

    # print("*** Usage: python {} <csv> <groupId> <token>".format(sys.argv[0]))
    # print("***        csv: a CSV file exported from Synapses.")
    # print("***             The first three columns are assumed to be ")
    # print("***             last name, first name, email address.")
    # print("***    groupId: The GitLab id where all the projects will")
    # print("***             be added.")
    # print("***      token: A GitLab API token as created at ")
    # print("***             {}/-/profile/personal_access_tokens".format(GITLAB_URL))
    # print("***             Be sure to enable API scope.")
    # sys.exit(1)

    def parse_args():
        parser = argparse.ArgumentParser(description="Create GitLab repositories")
        parser.add_argument("csv", help="CSV file as exported from Synapses. The first four columns are assumed to be last name, first name, email address, login.")
        parser.add_argument("groupId", help="The GitLab id where all projects will be added.")
        parser.add_argument("-t", "--token", help="GitLab API token as created at {}/-/profile/personal_access_tokens".format(GITLAB_URL))
        parser.add_argument("-n", "--dry-run", help="Do not actually create repositories.", action="store_true")
        # TODO: parser.add_argument("--extract-groups", help="Extract groups from the fourth column in the CSV file", action="store_true")

        args = parser.parse_args()

        return args

    args = parse_args()
    makeProjectsInGroupId(args.groupId, args.csv, args.token, args)