#!/usr/bin/python2.7

# grouper_create_composite_group
# create a composite group

import httplib2
import json
import sys,string

def usage():
    print('usage: grouper_create_composite_group -f <folder> -g <groupid> -n <name> -d <description> -t <type> -l <leftgroup> -r <rightgroup>')
    print('-f   group will be created in this folder')
    print('-g   group ID')
    print('-n   group name')
    print('-d   group description')
    print('-t   composite type can be intersection or complement')
    print('-l   left group')
    print('-r   right group')
    exit(1)

def main():
    if len(sys.argv) != 15:
        usage()
    if sys.argv[1] != '-f':
        usage()
    thisFolder = sys.argv[2]

    if sys.argv[3] != '-g':
        usage()
    thisGroupId = sys.argv[4]

    if sys.argv[5] != '-n':
        usage()
    thisGroupName = sys.argv[6]

    if sys.argv[7] != '-d':
        usage()
    thisGroupDesc = sys.argv[8]

    if sys.argv[9] != '-t':
        usage()
    thisCompositeType = sys.argv[10]

    if sys.argv[11] != '-l':
        usage()
    thisLeftGroup = sys.argv[12]

    if sys.argv[13] != '-r':
        usage()
    thisRightGroup = sys.argv[14]

    thisGroup = thisFolder+':'+thisGroupId

    # initialize httplib2
    http = httplib2.Http()

    # set the grouper URI (dev or prod), username, password
    grouper_ws_uri = grouperWSParameters(http)

    # give an error if the group already exists
    if grouperGetUuid(http,grouper_ws_uri,thisGroup) != 0:
        print(thisGroup + " group already exists")
        exit(1)

    # verify that the left group exists and is accessible by this user
    if grouperGetUuid(http,grouper_ws_uri,thisLeftGroup) == 0:
        print(thisLeftGroup + " group not found (does not exist or is not accessible)")
        exit(1)

    # verify that the right group exists and is accessible by this user
    if grouperGetUuid(http,grouper_ws_uri,thisRightGroup) == 0:
        print(thisRightGroup + " group not found (does not exist or is not accessible)")
        exit(1)

    # create a composite group
    createGroup = grouperCreateCompositeGroup(http,grouper_ws_uri,thisFolder,thisGroupId,thisGroupName,thisGroupDesc,
                thisCompositeType,thisLeftGroup,thisRightGroup)
    if createGroup and createGroup['WsGroupSaveResults']['resultMetadata']['resultCode'] == 'SUCCESS':
        print(thisGroup + " group created")
    else:
        print("unable to create " + thisGroup)

def grouperCreateCompositeGroup(http, grouper_ws_uri, stemIdPath, groupId, groupName, groupDescription,
                compositeType, leftGroupIdPath, rightGroupIdPath):
    # create composite group
    groupIdPath = stemIdPath+':'+groupId
    if compositeType != 'intersection' and compositeType != 'complement':
        print("composite type "+compositeType+" must be intersection or complement")
        exit(1)
    body = {
      "WsRestGroupSaveRequest":{
         "wsGroupToSaves":[
           {
             "wsGroupLookup":{
               "groupName": groupIdPath
               },
             "wsGroup":{
               "extension": groupId,
               "displayExtension": groupName,
               "name": groupIdPath,
               "description": groupDescription,
               "detail":{
                 "hasComposite": "T",
                 "compositeType": compositeType,
                 "leftGroup":{
                   "name": leftGroupIdPath
                   },
                 "rightGroup":{
                   "name": rightGroupIdPath
                   }
                 }
               }
             }
           ]
         }
      }
    result = grouperWSRequest(http, grouper_ws_uri+"/groups", "POST", body)
    return result

def grouperGetUuid(http, grouper_ws_uri, groupName):
    # get UUID for the specified group
    thisuuid = 0
    body = {
      "WsRestFindGroupsRequest": {
        "wsQueryFilter": {
          "groupName": groupName,
          "queryFilterType": "FIND_BY_GROUP_NAME_EXACT",
        }
      }
    }
    findGroups = grouperWSRequest(http, grouper_ws_uri + "/groups", "POST", body)
    if findGroups and findGroups['WsFindGroupsResults']['resultMetadata']['success'] and 'groupResults' in findGroups['WsFindGroupsResults']:
        thisuuid = findGroups['WsFindGroupsResults']['groupResults'][0]['uuid']
    return thisuuid

def grouperWSRequest(http, url, method, body):
    # send a request to the Grouper Web Service
    # method can be GET, POST, or PUT
    content_type = 'application/x-www-form-urlencoded'
    if method == "POST" or method == "PUT":
        content_type = 'text/x-json; charset=UTF-8'

    try:
        resp, content = http.request(uri=url,
            method=method,
            body=json.dumps(body),
            headers={'Content-Type': content_type})
        if resp.status == 200 or resp.status == 201:
            result = json.loads(content.decode('utf-8'))
            return result
    except httplib2.ServerNotFoundError as err:
        print("Unable to connect to Grouper Web Service")
        print(err)
        return None
    # http request failed, print the response status and content
    print("http response status "+str(resp.status))
    print("http response content "+content)
    return None

def grouperWSParameters(http):
    # set the Grouper Web Service username and password
    grouper_username = 'abc1234'
    grouper_password = 'xxxxxxxxxxxxxxxxxxxx'
    http.add_credentials(name=grouper_username, password=grouper_password)

    # the Grouper Web Service URI should point to dev or prod Grouper
    devGrouperURI  = 'https://grouper-dev.cc.columbia.edu/grouper-ws/servicesRest/v2_4_000'
    prodGrouperURI = 'https://grouper.cc.columbia.edu/grouper-ws/servicesRest/v2_4_000'
    return devGrouperURI

if __name__ == '__main__':
    main()