#!/usr/bin/env python
#
# @author:  Gunnar Schaefer

import os
import json
import pymongo
import hashlib
import logging
import argparse


def rsinit(args):
    db_client = pymongo.MongoClient(args.db_uri)
    repl_conf = eval(args.config)
    db_client.admin.command('replSetInitiate', repl_conf)

rsinit_desc = """
example:
./scripts/bootstrap.py rsinit mongodb://cnifs.stanford.edu \\
"dict(_id='cni', members=[ \\
    dict(_id=0, host='cnifs.stanford.edu'), \\
    dict(_id=1, host='cnibk.stanford.edu', priority=0.5), \\
    dict(_id=2, host='cni.stanford.edu', arbiterOnly=True), \\
])"
"""


def authinit(args):
    db_client = pymongo.MongoClient(args.db_uri)
    db_client['admin'].add_user(name='admin', password=args.password, roles=['userAdminAnyDatabase'])
    db_client['nims'].add_user(name=args.username, password=args.password, roles=['readWrite', 'dbAdmin'])
    uri_parts = args.db_uri.partition('://')
    print 'You must now restart mongod with the "--auth" parameter and modify your URI as follows:'
    print '    %s%s:%s@%s' % (uri_parts[0] + uri_parts[1], args.username, args.password, uri_parts[2])

    print 'openssl rand -base64 756 > cni.key'

authinit_desc = """
example:
./scripts/bootstrap.py authinit nims secret_pw mongodb://cnifs.stanford.edu/nims?replicaSet=cni
"""


def dbinit(args):
    db_client = pymongo.MongoReplicaSetClient(args.db_uri) if 'replicaSet' in args.db_uri else pymongo.MongoClient(args.db_uri)
    db = db_client.get_default_database()

    if args.force:
        db_client.drop_database(db)

    db.projects.create_index([('gid', 1), ('name', 1)])
    db.sessions.create_index('project')
    db.sessions.create_index('uid')
    db.acquisitions.create_index('session')
    db.acquisitions.create_index('uid')
    db.acquisitions.create_index('collections')
    db.tokens.create_index('timestamp', expireAfterSeconds=600)
    db.downloads.create_index('timestamp', expireAfterSeconds=60)

    if args.json:
        with open(args.json) as json_dump:
            input_data = json.load(json_dump)
        if 'users' in input_data:
            db.users.insert(input_data['users'])
        if 'groups' in input_data:
            db.groups.insert(input_data['groups'])
        for u in db.users.find():
            db.users.update({'_id': u['_id']}, {'$set': {'email_hash': hashlib.md5(u['email']).hexdigest()}})

    db.groups.update({'_id': 'unknown'}, {'$set': {'_id': 'unknown'}}, upsert=True)

dbinit_desc = """
example:
./scripts/bootstrap.py dbinit mongodb://cnifs.stanford.edu/nims?replicaSet=cni -j nims_users_and_groups.json
"""


def sort(args):
    logging.basicConfig(level=logging.WARNING)
    import util
    data_path = os.path.join(args.sort_path, 'nims')
    quarantine_path = os.path.join(args.sort_path, 'quarantine')
    if not os.path.exists(data_path):
        os.makedirs(data_path)
    if not os.path.exists(quarantine_path):
        os.makedirs(quarantine_path)
    print 'initializing DB'
    kwargs = dict(tz_aware=True)
    db_client = pymongo.MongoReplicaSetClient(args.db_uri, **kwargs) if 'replicaSet' in args.db_uri else pymongo.MongoClient(args.db_uri, **kwargs)
    db = db_client.get_default_database()
    print 'inspecting %s' % args.path
    files = []
    for dirpath, dirnames, filenames in os.walk(args.path):
        for filepath in [os.path.join(dirpath, fn) for fn in filenames if not fn.startswith('.')]:
            if not os.path.islink(filepath):
                files.append(filepath)
        dirnames[:] = [dn for dn in dirnames if not dn.startswith('.')] # need to use slice assignment to influence walk behavior
    file_cnt = len(files)
    print 'found %d files to sort (ignoring symlinks and dotfiles)' % file_cnt
    for i, filepath in enumerate(files):
        print 'sorting     %s [%s] (%d/%d)' % (os.path.basename(filepath), util.hrsize(os.path.getsize(filepath)), i+1, file_cnt)
        hash_ = hashlib.sha1()
        if not args.quick:
            with open(filepath, 'rb') as fd:
                for chunk in iter(lambda: fd.read(1048577 * hash_.block_size), ''):
                    hash_.update(chunk)
        status, detail = util.insert_file(db.acquisitions, None, None, filepath, hash_.hexdigest(), data_path, quarantine_path)
        if status != 200:
            print detail

sort_desc = """
example:
./scripts/bootstrap.py sort mongodb://localhost/nims /tmp/data /tmp/sorted
"""

def dbinitsort(args):
    logging.basicConfig(level=logging.WARNING)
    dbinit(args)
    sort(args)

dbinitsort_desc = """
example:
./scripts/bootstrap.py dbinitsort mongodb://localhost/nims -j bootstrap.json /tmp/data /tmp/sorted
"""

def upload(args):
    import util
    import datetime
    import requests
    print 'inspecting %s' % args.path
    files = []
    for dirpath, dirnames, filenames in os.walk(args.path):
        for filepath in [os.path.join(dirpath, fn) for fn in filenames if not fn.startswith('.')]:
            if not os.path.islink(filepath):
                files.append(filepath)
        dirnames[:] = [dn for dn in dirnames if not dn.startswith('.')] # need to use slice assignment to influence walk behavior
    print 'found %d files to upload (ignoring symlinks and dotfiles)' % len(files)
    for filepath in files:
        filename = os.path.basename(filepath)
        print 'hashing     %s' % filename
        hash_ = hashlib.sha1()
        with open(filepath, 'rb') as fd:
            for chunk in iter(lambda: fd.read(1048577 * hash_.block_size), ''):
                hash_.update(chunk)
        print 'uploading   %s [%s]' % (filename, util.hrsize(os.path.getsize(filepath)))
        with open(filepath, 'rb') as fd:
            headers = {'User-Agent': 'bootstrapper', 'Content-MD5': hash_.hexdigest()}
            try:
                start = datetime.datetime.now()
                r = requests.put(args.url + '?filename=%s' % filename, data=fd, headers=headers)
                upload_duration = (datetime.datetime.now() - start).total_seconds()
            except requests.exceptions.ConnectionError as e:
                print 'error       %s: %s' % (filename, e)
            else:
                if r.status_code == 200:
                    print 'success     %s [%s/s]' % (filename, util.hrsize(os.path.getsize(filepath)/upload_duration))
                else:
                    print 'failure     %s: %s %s, %s' % (log_info, filename, r.status_code, r.reason, r.text)

upload_desc = """
example:
./scripts/bootstrap.py upload /tmp/data https://example.com/upload
"""


parser = argparse.ArgumentParser()
subparsers = parser.add_subparsers(help='operation to perform')

rsinit_parser = subparsers.add_parser(
        name='rsinit',
        help='initialize replication set',
        description=rsinit_desc,
        formatter_class=argparse.RawDescriptionHelpFormatter,
        )
rsinit_parser.add_argument('db_uri', help='DB URI')
rsinit_parser.add_argument('config', help='replication set config')
rsinit_parser.set_defaults(func=rsinit)

authinit_parser = subparsers.add_parser(
        name='authinit',
        help='initialize authentication',
        description=authinit_desc,
        formatter_class=argparse.RawDescriptionHelpFormatter,
        )
authinit_parser.add_argument('username', help='DB username')
authinit_parser.add_argument('password', help='DB password')
authinit_parser.add_argument('db_uri', help='DB URI')
authinit_parser.set_defaults(func=authinit)

dbinit_parser = subparsers.add_parser(
        name='dbinit',
        help='initialize database',
        description=dbinit_desc,
        formatter_class=argparse.RawDescriptionHelpFormatter,
        )
dbinit_parser.add_argument('-f', '--force', action='store_true', help='wipe out any existing data')
dbinit_parser.add_argument('-j', '--json', help='JSON file containing users and groups')
dbinit_parser.add_argument('db_uri', help='DB URI')
dbinit_parser.set_defaults(func=dbinit)

sort_parser = subparsers.add_parser(
        name='sort',
        help='sort all files in a dicrectory tree',
        description=sort_desc,
        formatter_class=argparse.RawDescriptionHelpFormatter,
        )
sort_parser.add_argument('-q', '--quick', action='store_true', help='omit computing of file checksums')
sort_parser.add_argument('db_uri', help='database URI')
sort_parser.add_argument('path', help='filesystem path to data')
sort_parser.add_argument('sort_path', help='filesystem path to sorted data')
sort_parser.set_defaults(func=sort)

dbinitsort_parser = subparsers.add_parser(
    name='dbinitsort',
    help='initialize database, then sort all files in a directory tree',
    description=dbinitsort_desc,
    formatter_class=argparse.RawDescriptionHelpFormatter,
    )
dbinitsort_parser.add_argument('db_uri', help='database URI')
dbinitsort_parser.add_argument('path', help='filesystem path to data')
dbinitsort_parser.add_argument('sort_path', help='filesystem path to sorted data')
dbinitsort_parser.add_argument('-q', '--quick', action='store_true', help='omit computing of file checksums')
dbinitsort_parser.add_argument('-j', '--json', help='JSON file container users and groups')
dbinitsort_parser.add_argument('-f', '--force', action='store_true', help='wipe out any existing db data')
dbinitsort_parser.set_defaults(func=dbinitsort)

upload_parser = subparsers.add_parser(
        name='upload',
        help='upload all files in a directory tree',
        description=upload_desc,
        formatter_class=argparse.RawDescriptionHelpFormatter,
        )
upload_parser.add_argument('path', help='filesystem path to data')
upload_parser.add_argument('url', help='upload URL')
upload_parser.set_defaults(func=upload)

args = parser.parse_args()
args.func(args)