#!/usr/bin/env python3
from pyVmomi import vim
import pyVim.connect
import atexit
import argparse
from pprint import pprint
import sys
import siteconf
            
site_conf = siteconf.read()


def get_args():
    parser = argparse.ArgumentParser(
        description='Deletes a vm snapshot.')

    parser.add_argument('-s', '--site',
                        required=True,
                        action='store',
                        help='name of the site to connect to')

    parser.add_argument('-v', '--vm',
                        required=True,
                        action='store',
                        help='vm to delete snapshot from')

    parser.add_argument('-n', '--snapshotname',
                        required=True,
                        action='store',
                        help='snapshot name')

    args = parser.parse_args()
    return args

def get_obj(content, vimtype, name):
    """
    Return an object by name, if name is None the
    first found object is returned
    """ 
    obj = None
    container = content.viewManager.CreateContainerView(
        content.rootFolder, vimtype, True)
    for c in container.view:
        if name:
            if c.name == name:
                obj = c
                break
        else:
            obj = c
            break
    return obj


def wait_for_task(task):
    """ wait for a vCenter task to finish """
    task_done = False
    while not task_done:
        if task.info.state == 'success':
            return task.info.result

        if task.info.state == 'error':
            print("there was an error")
            task_done = True


def find_snapshots(snapshots, name):
    snap_obj = []
    for snapshot in snapshots:
        if snapshot.name == name:
            snap_obj.append(snapshot)
        snap_obj = snap_obj + find_snapshots(
            snapshot.childSnapshotList, name)
    return snap_obj


def main():
    args = get_args()

    if not args.site in site_conf:
        print(f"site not found: {args.site}")
        exit(1)
    host = site_conf[args.site]['vcenter']
    user = site_conf[args.site]['vcenter_user']
    passwd = site_conf[args.site]['vcenter_passwd']


    si = pyVim.connect.SmartConnect(
        host = host,
        user = user,
        pwd = passwd,
        disableSslCertValidation = True
        )
    atexit.register(pyVim.connect.Disconnect, si)
    content = si.RetrieveContent()

    vm = get_obj(content, [vim.VirtualMachine], args.vm)
    if vm == None:
        print("vm not found: "+ args.vm)
        exit(1)
    if vm.snapshot is None:
        print("vm has no snapshots: "+ args.vm)
        exit(1)
    snaplist = find_snapshots(vm.snapshot.rootSnapshotList, args.snapshotname)
    for s in snaplist:
        print(f"removing {args.vm} snapshot {s.name} ({s.createTime})")
        remove_children = False
        consolidate = True
        wait_for_task(s.snapshot.RemoveSnapshot_Task(remove_children, consolidate))


if __name__ == "__main__":
    main()

# vim: set tabstop=4 shiftwidth=4 expandtab smarttab: