# mypy: ignore-errors

import os
import re

from ... import exc
from ...engine import url as sa_url
from ...testing.provision import create_db
from ...testing.provision import drop_db
from ...testing.provision import follower_url_from_main
from ...testing.provision import generate_driver_url
from ...testing.provision import log
from ...testing.provision import post_configure_engine
from ...testing.provision import run_reap_dbs
from ...testing.provision import stop_test_class_outside_fixtures
from ...testing.provision import temp_table_keyword_args
from ...testing.provision import upsert


# TODO: I can't get this to build dynamically with pytest-xdist procs
_drivernames = {
    "pysqlite",
    "aiosqlite",
    "pysqlcipher",
    "pysqlite_numeric",
    "pysqlite_dollar",
}


def _format_url(url, driver, ident):
    """given a sqlite url + desired driver + ident, make a canonical
    URL out of it

    """
    url = sa_url.make_url(url)

    if driver is None:
        driver = url.get_driver_name()

    filename = url.database

    needs_enc = driver == "pysqlcipher"
    name_token = None

    if filename and filename != ":memory:":
        assert "test_schema" not in filename
        tokens = re.split(r"[_\.]", filename)

        new_filename = f"{driver}"

        for token in tokens:
            if token in _drivernames:
                if driver is None:
                    driver = token
                continue
            elif token in ("db", "enc"):
                continue
            elif name_token is None:
                name_token = token.strip("_")

        assert name_token, f"sqlite filename has no name token: {url.database}"

        new_filename = f"{name_token}_{driver}"
        if ident:
            new_filename += f"_{ident}"
        new_filename += ".db"
        if needs_enc:
            new_filename += ".enc"
        url = url.set(database=new_filename)

    if needs_enc:
        url = url.set(password="test")

    url = url.set(drivername="sqlite+%s" % (driver,))

    return url


@generate_driver_url.for_db("sqlite")
def generate_driver_url(url, driver, query_str):
    url = _format_url(url, driver, None)

    try:
        url.get_dialect()
    except exc.NoSuchModuleError:
        return None
    else:
        return url


@follower_url_from_main.for_db("sqlite")
def _sqlite_follower_url_from_main(url, ident):
    return _format_url(url, None, ident)


@post_configure_engine.for_db("sqlite")
def _sqlite_post_configure_engine(url, engine, follower_ident):
    from sqlalchemy import event

    if follower_ident:
        attach_path = f"{follower_ident}_{engine.driver}_test_schema.db"
    else:
        attach_path = f"{engine.driver}_test_schema.db"

    @event.listens_for(engine, "connect")
    def connect(dbapi_connection, connection_record):
        # use file DBs in all cases, memory acts kind of strangely
        # as an attached

        # NOTE!  this has to be done *per connection*.  New sqlite connection,
        # as we get with say, QueuePool, the attaches are gone.
        # so schemes to delete those attached files have to be done at the
        # filesystem level and not rely upon what attachments are in a
        # particular SQLite connection
        dbapi_connection.execute(
            f'ATTACH DATABASE "{attach_path}" AS test_schema'
        )

    @event.listens_for(engine, "engine_disposed")
    def dispose(engine):
        """most databases should be dropped using
        stop_test_class_outside_fixtures

        however a few tests like AttachedDBTest might not get triggered on
        that main hook

        """

        if os.path.exists(attach_path):
            os.remove(attach_path)

        filename = engine.url.database

        if filename and filename != ":memory:" and os.path.exists(filename):
            os.remove(filename)


@create_db.for_db("sqlite")
def _sqlite_create_db(cfg, eng, ident):
    pass


@drop_db.for_db("sqlite")
def _sqlite_drop_db(cfg, eng, ident):
    _drop_dbs_w_ident(eng.url.database, eng.driver, ident)


def _drop_dbs_w_ident(databasename, driver, ident):
    for path in os.listdir("."):
        fname, ext = os.path.split(path)
        if ident in fname and ext in [".db", ".db.enc"]:
            log.info("deleting SQLite database file: %s", path)
            os.remove(path)


@stop_test_class_outside_fixtures.for_db("sqlite")
def stop_test_class_outside_fixtures(config, db, cls):
    db.dispose()


@temp_table_keyword_args.for_db("sqlite")
def _sqlite_temp_table_keyword_args(cfg, eng):
    return {"prefixes": ["TEMPORARY"]}


@run_reap_dbs.for_db("sqlite")
def _reap_sqlite_dbs(url, idents):
    log.info("db reaper connecting to %r", url)
    log.info("identifiers in file: %s", ", ".join(idents))
    url = sa_url.make_url(url)
    for ident in idents:
        for drivername in _drivernames:
            _drop_dbs_w_ident(url.database, drivername, ident)


@upsert.for_db("sqlite")
def _upsert(cfg, table, returning, set_lambda=None):
    from sqlalchemy.dialects.sqlite import insert

    stmt = insert(table)

    if set_lambda:
        stmt = stmt.on_conflict_do_update(set_=set_lambda(stmt.excluded))
    else:
        stmt = stmt.on_conflict_do_nothing()

    stmt = stmt.returning(*returning)
    return stmt
