"""Alembic env.py — Turf SaaS database migrations."""

import os
from logging.config import fileConfig

from sqlalchemy import engine_from_config, pool
from alembic import context

# Alembic Config object — gives access to .ini values
config = context.config

# Set logging from config
if config.config_file_name is not None:
    fileConfig(config.config_file_name)


# Override sqlalchemy.url from environment variables
def get_db_url():
    user = os.environ.get("POSTGRES_USER", "turf")
    password = os.environ.get("POSTGRES_PASSWORD", "")
    host = os.environ.get("POSTGRES_HOST", "localhost")
    port = os.environ.get("POSTGRES_PORT", "5432")
    db = os.environ.get("POSTGRES_DB", "turf_saas")
    url = os.environ.get(
        "DATABASE_URL", f"postgresql://{user}:{password}@{host}:{port}/{db}"
    )
    return url


config.set_main_option("sqlalchemy.url", get_db_url())

# No declarative model — we use raw DDL migrations
target_metadata = None


def run_migrations_offline() -> None:
    """Run migrations in 'offline' mode (no live DB connection needed)."""
    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 (uses live DB connection)."""
    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()