from celery.decorators import task
from celery.task.sets import subtask
from celeryconfig import PYLONS_CONFIG as config
from pylons.i18n.translation import _
from pylons_app.lib.celerylib import run_task, LockTask
from pylons_app.lib.helpers import person
from pylons_app.lib.smtp_mailer import SmtpMailer
from pylons_app.lib.utils import OrderedDict
from operator import itemgetter
from vcs.backends.hg import MercurialRepository
from time import mktime
import traceback
import json

__all__ = ['whoosh_index', 'get_commits_stats',
           'reset_user_password', 'send_email']

def get_session():
    from sqlalchemy import engine_from_config
    from sqlalchemy.orm import sessionmaker, scoped_session
    engine = engine_from_config(dict(config.items('app:main')), 'sqlalchemy.db1.')
    sa = scoped_session(sessionmaker(bind=engine))
    return sa

def get_hg_settings():
    from pylons_app.model.db import HgAppSettings
    try:
        sa = get_session()
        ret = sa.query(HgAppSettings).all()
    finally:
        sa.remove()
        
    if not ret:
        raise Exception('Could not get application settings !')
    settings = {}
    for each in ret:
        settings['hg_app_' + each.app_settings_name] = each.app_settings_value    
    
    return settings

def get_hg_ui_settings():
    from pylons_app.model.db import HgAppUi
    try:
        sa = get_session()
        ret = sa.query(HgAppUi).all()
    finally:
        sa.remove()
        
    if not ret:
        raise Exception('Could not get application ui settings !')
    settings = {}
    for each in ret:
        k = each.ui_key
        v = each.ui_value
        if k == '/':
            k = 'root_path'
        
        if k.find('.') != -1:
            k = k.replace('.', '_')
        
        if each.ui_section == 'hooks':
            v = each.ui_active
        
        settings[each.ui_section + '_' + k] = v  
    
    return settings   

@task
def whoosh_index(repo_location, full_index):
    log = whoosh_index.get_logger()
    from pylons_app.lib.pidlock import DaemonLock
    from pylons_app.lib.indexers.daemon import WhooshIndexingDaemon, LockHeld
    try:
        l = DaemonLock()
        WhooshIndexingDaemon(repo_location=repo_location)\
            .run(full_index=full_index)
        l.release()
        return 'Done'
    except LockHeld:
        log.info('LockHeld')
        return 'LockHeld'    


@task
@LockTask('get_commits_stats')
def get_commits_stats(repo_name, ts_min_y, ts_max_y):
    author_key_cleaner = lambda k: person(k).replace('"', "") #for js data compatibilty
        
    from pylons_app.model.db import Statistics, Repository
    log = get_commits_stats.get_logger()
    commits_by_day_author_aggregate = {}
    commits_by_day_aggregate = {}
    repos_path = get_hg_ui_settings()['paths_root_path'].replace('*', '')
    repo = MercurialRepository(repos_path + repo_name)

    skip_date_limit = True
    parse_limit = 350 #limit for single task changeset parsing
    last_rev = 0
    last_cs = None
    timegetter = itemgetter('time')
    
    sa = get_session()
    
    dbrepo = sa.query(Repository)\
        .filter(Repository.repo_name == repo_name).scalar()
    cur_stats = sa.query(Statistics)\
        .filter(Statistics.repository == dbrepo).scalar()
    if cur_stats:
        last_rev = cur_stats.stat_on_revision
    
    if last_rev == repo.revisions[-1]:
        #pass silently without any work
        return True
    
    if cur_stats:
        commits_by_day_aggregate = OrderedDict(
                                       json.loads(
                                        cur_stats.commit_activity_combined))
        commits_by_day_author_aggregate = json.loads(cur_stats.commit_activity)
    
    for cnt, rev in enumerate(repo.revisions[last_rev:]):
        last_cs = cs = repo.get_changeset(rev)
        k = '%s-%s-%s' % (cs.date.timetuple()[0], cs.date.timetuple()[1],
                          cs.date.timetuple()[2])
        timetupple = [int(x) for x in k.split('-')]
        timetupple.extend([0 for _ in xrange(6)])
        k = mktime(timetupple)
        if commits_by_day_author_aggregate.has_key(author_key_cleaner(cs.author)):
            try:
                l = [timegetter(x) for x in commits_by_day_author_aggregate\
                        [author_key_cleaner(cs.author)]['data']]
                time_pos = l.index(k)
            except ValueError:
                time_pos = False
                
            if time_pos >= 0 and time_pos is not False:
                
                datadict = commits_by_day_author_aggregate\
                    [author_key_cleaner(cs.author)]['data'][time_pos]
                
                datadict["commits"] += 1
                datadict["added"] += len(cs.added)
                datadict["changed"] += len(cs.changed)
                datadict["removed"] += len(cs.removed)
                #print datadict
                
            else:
                #print 'ELSE !!!!'
                if k >= ts_min_y and k <= ts_max_y or skip_date_limit:
                    
                    datadict = {"time":k,
                                "commits":1,
                                "added":len(cs.added),
                                "changed":len(cs.changed),
                                "removed":len(cs.removed),
                               }
                    commits_by_day_author_aggregate\
                        [author_key_cleaner(cs.author)]['data'].append(datadict)
                                        
        else:
            #print k, 'nokey ADDING'
            if k >= ts_min_y and k <= ts_max_y or skip_date_limit:
                commits_by_day_author_aggregate[author_key_cleaner(cs.author)] = {
                                    "label":author_key_cleaner(cs.author),
                                    "data":[{"time":k,
                                             "commits":1,
                                             "added":len(cs.added),
                                             "changed":len(cs.changed),
                                             "removed":len(cs.removed),
                                             }],
                                    "schema":["commits"],
                                    }               
    
#        #gather all data by day
        if commits_by_day_aggregate.has_key(k):
            commits_by_day_aggregate[k] += 1
        else:
            commits_by_day_aggregate[k] = 1
        
        if cnt >= parse_limit:
            #don't fetch to much data since we can freeze application
            break

    overview_data = []
    for k, v in commits_by_day_aggregate.items():
        overview_data.append([k, v])
    overview_data = sorted(overview_data, key=itemgetter(0))
        
    if not commits_by_day_author_aggregate:
        commits_by_day_author_aggregate[author_key_cleaner(repo.contact)] = {
            "label":author_key_cleaner(repo.contact),
            "data":[0, 1],
            "schema":["commits"],
        }

    stats = cur_stats if cur_stats else Statistics()
    stats.commit_activity = json.dumps(commits_by_day_author_aggregate)
    stats.commit_activity_combined = json.dumps(overview_data)
    stats.repository = dbrepo
    stats.stat_on_revision = last_cs.revision
    stats.languages = json.dumps({'_TOTAL_':0, '':0})
    
    try:
        sa.add(stats)
        sa.commit()    
    except:
        log.error(traceback.format_exc())
        sa.rollback()
        return False
    
    run_task(get_commits_stats, repo_name, ts_min_y, ts_max_y)
                            
    return True

@task
def reset_user_password(user_email):
    log = reset_user_password.get_logger()
    from pylons_app.lib import auth
    from pylons_app.model.db import User
    
    try:
        try:
            sa = get_session()
            user = sa.query(User).filter(User.email == user_email).scalar()
            new_passwd = auth.PasswordGenerator().gen_password(8,
                             auth.PasswordGenerator.ALPHABETS_BIG_SMALL)
            if user:
                user.password = auth.get_crypt_password(new_passwd)
                sa.add(user)
                sa.commit()
                log.info('change password for %s', user_email)
            if new_passwd is None:
                raise Exception('unable to generate new password')
            
        except:
            log.error(traceback.format_exc())
            sa.rollback()
        
        run_task(send_email, user_email,
                 "Your new hg-app password",
                 'Your new hg-app password:%s' % (new_passwd))
        log.info('send new password mail to %s', user_email)
        
        
    except:
        log.error('Failed to update user password')
        log.error(traceback.format_exc())
    return True

@task    
def send_email(recipients, subject, body):
    log = send_email.get_logger()
    email_config = dict(config.items('DEFAULT')) 
    mail_from = email_config.get('app_email_from')
    user = email_config.get('smtp_username')
    passwd = email_config.get('smtp_password')
    mail_server = email_config.get('smtp_server')
    mail_port = email_config.get('smtp_port')
    tls = email_config.get('smtp_use_tls')
    ssl = False
    
    try:
        m = SmtpMailer(mail_from, user, passwd, mail_server,
                       mail_port, ssl, tls)
        m.send(recipients, subject, body)  
    except:
        log.error('Mail sending failed')
        log.error(traceback.format_exc())
        return False
    return True