"""Option and configuration implementations, run by the nose plugin
on test suite startup."""

import time
import warnings
import sys
import re

logging = None
db = None
db_label = None
db_url = None
db_opts = {}
options = None
file_config = None

def _log(option, opt_str, value, parser):
    global logging
    if not logging:
        import logging
        logging.basicConfig()

    if opt_str.endswith('-info'):
        logging.getLogger(value).setLevel(logging.INFO)
    elif opt_str.endswith('-debug'):
        logging.getLogger(value).setLevel(logging.DEBUG)


def _list_dbs(*args):
    print "Available --db options (use --dburi to override)"
    for macro in sorted(file_config.options('db')):
        print "%20s\t%s" % (macro, file_config.get('db', macro))
    sys.exit(0)

def _server_side_cursors(options, opt_str, value, parser):
    db_opts['server_side_cursors'] = True

def _zero_timeout(options, opt_str, value, parser):
    warnings.warn("--zero-timeout testing option is now on in all cases")

def _engine_strategy(options, opt_str, value, parser):
    if value:
        db_opts['strategy'] = value

pre_configure = []
post_configure = []

def _setup_options(opt, file_config):
    global options
    options = opt
pre_configure.append(_setup_options)

def _monkeypatch_cdecimal(options, file_config):
    if options.cdecimal:
        import sys
        import cdecimal
        sys.modules['decimal'] = cdecimal
pre_configure.append(_monkeypatch_cdecimal)

def _engine_uri(options, file_config):
    global db_label, db_url

    if options.dburi:
        db_url = options.dburi
        db_label = db_url[:db_url.index(':')]
    elif options.db:
        db_label = options.db
        db_url = None

    if db_url is None:
        if db_label not in file_config.options('db'):
            raise RuntimeError(
                "Unknown engine.  Specify --dbs for known engines.")
        db_url = file_config.get('db', db_label)
post_configure.append(_engine_uri)

def _require(options, file_config):
    if not(options.require or
           (file_config.has_section('require') and
            file_config.items('require'))):
        return

    try:
        import pkg_resources
    except ImportError:
        raise RuntimeError("setuptools is required for version requirements")

    cmdline = []
    for requirement in options.require:
        pkg_resources.require(requirement)
        cmdline.append(re.split('\s*(<!>=)', requirement, 1)[0])

    if file_config.has_section('require'):
        for label, requirement in file_config.items('require'):
            if not label == db_label or label.startswith('%s.' % db_label):
                continue
            seen = [c for c in cmdline if requirement.startswith(c)]
            if seen:
                continue
            pkg_resources.require(requirement)
post_configure.append(_require)

def _engine_pool(options, file_config):
    if options.mockpool:
        from sqlalchemy import pool
        db_opts['poolclass'] = pool.AssertionPool
post_configure.append(_engine_pool)

def _create_testing_engine(options, file_config):
    from sqlalchemy.testing import engines, config
    from sqlalchemy import testing
    global db
    config.db = testing.db = db = engines.testing_engine(db_url, db_opts)
    config.db_opts = db_opts
    config.db_url = db_url

post_configure.append(_create_testing_engine)

def _prep_testing_database(options, file_config):
    from sqlalchemy.testing import engines
    from sqlalchemy import schema

    # also create alt schemas etc. here?
    if options.dropfirst:
        e = engines.utf8_engine()
        existing = e.table_names()
        if existing:
            print "Dropping existing tables in database: " + db_url
            try:
                print "Tables: %s" % ', '.join(existing)
            except:
                pass
            print "Abort within 5 seconds..."
            time.sleep(5)
            md = schema.MetaData(e, reflect=True)
            md.drop_all()
        e.dispose()

post_configure.append(_prep_testing_database)

def _set_table_options(options, file_config):
    from sqlalchemy.testing import schema

    table_options = schema.table_options
    for spec in options.tableopts:
        key, value = spec.split('=')
        table_options[key] = value

    if options.mysql_engine:
        table_options['mysql_engine'] = options.mysql_engine
post_configure.append(_set_table_options)

def _reverse_topological(options, file_config):
    if options.reversetop:
        from sqlalchemy.orm import unitofwork, session, mapper, dependency
        from sqlalchemy.util import topological
        from sqlalchemy.testing.util import RandomSet
        topological.set = unitofwork.set = session.set = mapper.set = \
                dependency.set = RandomSet
post_configure.append(_reverse_topological)

def _requirements(options, file_config):
    from sqlalchemy.testing import config
    from sqlalchemy import testing
    requirement_cls = file_config.get('sqla_testing', "requirement_cls")

    modname, clsname = requirement_cls.split(":")

    # importlib.import_module() only introduced in 2.7, a little
    # late
    mod = __import__(modname)
    for component in modname.split(".")[1:]:
        mod = getattr(mod, component)
    req_cls = getattr(mod, clsname)
    config.requirements = testing.requires = req_cls(db, config)

post_configure.append(_requirements)

def _post_setup_options(opt, file_config):
    from sqlalchemy.testing import config
    config.options = options
post_configure.append(_post_setup_options)

def _setup_profiling(options, file_config):
    from sqlalchemy.testing import profiling
    profiling._profile_stats = profiling.ProfileStatsFile(
                file_config.get('sqla_testing', 'profile_file'))

post_configure.append(_setup_profiling)