import os
from logging.config import fileConfig
from sqlalchemy import engine_from_config, pool
from alembic import context
from dotenv import load_dotenv

# Load environment variables from .env
load_dotenv()

# This is the Alembic Config object
config = context.config

# Dynamically set the sqlalchemy.url from our .env file
db_url = os.getenv("DATABASE_URL")
if db_url:
    # Ensure serverless NeonDB SSL settings are matched
    if "localhost" not in db_url and "sslmode" not in db_url:
        if "?" in db_url:
            db_url += "&sslmode=require"
        else:
            db_url += "?sslmode=require"
    config.set_main_option("sqlalchemy.url", db_url)

# Interpret the config file for Python logging
if config.config_file_name is not None:
    fileConfig(config.config_file_name)

# Import models so Alembic target_metadata knows they exist
from app.services.database import Base
from app.models.database_models import (
    CaseContextModel,
    FactModel,
    HypothesisModel,
    EvidenceModel,
    VerificationModel
)

# Set the metadata object for 'autogenerate' support
target_metadata = Base.metadata

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