"""
Alembic Migration Environment
"""
import os
import sys
from logging.config import fileConfig

from sqlalchemy import engine_from_config
from sqlalchemy import pool

from alembic import context

# Füge das Projekt-Root zum Python-Path hinzu
sys.path.insert(0, os.path.dirname(os.path.dirname(__file__)))

# Import der Models und Database Config
from app.models.base import Base
from app.database import DATABASE_URL
import app.models  # Importiert alle Models

# Alembic Config Objekt
config = context.config

# Override der sqlalchemy.url mit der aus Environment
if DATABASE_URL:
    config.set_main_option("sqlalchemy.url", DATABASE_URL)

# Logging Setup
if config.config_file_name is not None:
    fileConfig(config.config_file_name)

# MetaData für Autogenerate
target_metadata = Base.metadata


def run_migrations_offline() -> None:
    """
    Run migrations in 'offline' mode.

    Generiert SQL-Statements ohne DB-Connection.
    """
    url = config.get_main_option("sqlalchemy.url")
    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )

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


def run_migrations_online() -> None:
    """
    Run migrations in 'online' mode.

    Führt Migrationen direkt auf der Datenbank aus.
    """
    connectable = engine_from_config(
        config.get_section(config.config_ini_section, {}),
        prefix="sqlalchemy.",
        poolclass=pool.NullPool,
    )

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

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


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