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#! /usr/bin/env python
import os, sys

from datetime import datetime
from lxml.etree import parse

path = os.path.join(os.path.dirname(__file__), os.path.pardir)
sys.path.insert(0, path)
del path

from grumpy import app
from grumpy.models import db, Herd, PkgIssue, Setting

PLUGIN_NAME='qa::valid_herd'

def gc_collect(timestamp):
    """Remove old QA issues from database returning number of rows deleted."""
    db.session.expire_all()
    print ("DEBUG: Deleted %d old issues." % PkgIssue.query \
                        .filter_by(plugin=PLUGIN_NAME) \
                        .filter(PkgIssue.created_on < timestamp).delete(False))

def insert_issues(invalid):
    """Insert QA issues into db."""
    if 'maintainer-needed' in invalid:
        h = Herd.query.filter_by(name='maintainer-needed').first()
        for pkg in h.packages:
            pkg.qaissues.append(PkgIssue(pkg, PLUGIN_NAME, 'maintainer-needed'))
        invalid.remove('maintainer-needed')
    if 'no-herd' in invalid:
        h = Herd.query.filter_by(name='no-herd').first()
        for pkg in h.packages:
            pkg.qaissues.append(PkgIssue(pkg, PLUGIN_NAME, 'maintainer-needed'))
        invalid.remove('no-herd')
    if 'fix-me' in invalid:
        h = Herd.query.filter_by(name='fix-me').first()
        for pkg in h.packages:
            pkg.qaissues.append(PkgIssue(pkg, PLUGIN_NAME, 'invalid-herd', \
                           'Please use no-herd instead of empty tag'))
        invalid.remove('fix-me')
    for herd in invalid:
        h = Herd.query.filter_by(name=herd).first()
        for pkg in h.packages:
            pkg.qaissues.append(PkgIssue(pkg, PLUGIN_NAME, 'unknown-herd', \
                      'Herd %s is not listed in official herd list.' % herd))
    db.session.commit()

def parse_herds_xml(file):
    """Return list of herd names from 'herds.xml'"""
    herds = []
    if not os.path.isfile(file):
        print ("File '%s' does not exist" % file)
        raise RuntimeError
    for child in parse(file).getroot().getchildren():
        for value in child.getchildren():
            if value.tag == 'name':
                herds.append(value.text)
    return herds

if __name__ == '__main__':
    # TODO: Download latest herds file
    # Parse list of herds from file
    herds = parse_herds_xml('herds.xml')
    b0rks = []
    timestamp = datetime.now()
    # Setup database for application
    with app.test_request_context():
        # Fetch list of herds from db
        for herd in Herd.query.all():
            if herd.name in herds:
                herds.remove(herd.name)
            else:
                b0rks.append(herd.name)
        insert_issues(b0rks)
        # Clean up issues < timestamp
        gc_collect(timestamp)
        # Update settings and add info about last run..
        Setting.query.filter_by(name=PLUGIN_NAME).delete(False)
        db.session.add(Setting(PLUGIN_NAME, str(timestamp)))
        db.session.commit()