from logging.config import fileConfig
import os
import sys
from pathlib import Path

from alembic import context
from sqlalchemy import engine_from_config, pool
from sqlalchemy.engine import URL

sys.path.insert(0, str(Path(__file__).resolve().parents[1] / "app"))

from models import Base

config = context.config

if config.config_file_name is not None:
    fileConfig(config.config_file_name)

target_metadata = Base.metadata

def get_url() -> str:
    url = URL.create(
        drivername="postgresql+psycopg",
        username=os.environ["DATABASE_USER"],
        password=os.environ["DATABASE_PASSWORD"],
        host=os.environ.get("DATABASE_HOST", "127.0.0.1"),
        port=int(os.environ.get("DATABASE_PORT", "5432")),
        database=os.environ["DATABASE_NAME"],
    )

    return url.render_as_string(hide_password=False)


def run_migrations_offline() -> None:
    context.configure(
        url=get_url(),
        target_metadata=target_metadata,
        literal_binds=True,
        compare_type=True,
    )

    with context.begin_transaction():
        context.run_migrations()


def run_migrations_online() -> None:
    configuration = config.get_section(config.config_ini_section) or {}
    configuration["sqlalchemy.url"] = get_url()

    connectable = engine_from_config(
        configuration,
        prefix="sqlalchemy.",
        poolclass=pool.NullPool,
    )

    with connectable.connect() as connection:
        context.configure(
            connection=connection,
            target_metadata=target_metadata,
            compare_type=True,
        )

        with context.begin_transaction():
            context.run_migrations()


if context.is_offline_mode():
    run_migrations_offline()
else:
    run_migrations_online()