import os
import sys
from logging.config import fileConfig

from sqlalchemy import engine_from_config
from sqlalchemy import pool

from alembic import context

# 1. Add project root (backend) to sys.path
parent_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))
if parent_dir not in sys.path:
    sys.path.insert(0, parent_dir)

# 2. Load environment variables from .env
from dotenv import load_dotenv
load_dotenv(os.path.join(parent_dir, ".env"))

# 3. Import Base and models so they are registered on Base.metadata
from app.core.database import Base
from app.models import rm_models  # Imports all models
from app.models import core_models
from app.models import vendor_portal
from app.models import bom_models
from app.models import maintenance_models
from app.models import sales_models
from app.models import access_models
from app.models import yard_models
from app.models import dealer_models
from app.models import procurement_models
from app.models import dispatch_models
from app.models import production_report_models
from app.models import production_models
from app.models import qa_models
from app.models import master_list_models
from app.models import station_work_models


# this is the Alembic Config object, which provides
# access to the values within the .ini file in use.
config = context.config

# 4. Read DATABASE_URL_SYNC from environment and override the config value
database_url = os.getenv("DATABASE_URL_SYNC")
if database_url:
    config.set_main_option("sqlalchemy.url", database_url)

# Interpret the config file for Python logging.
# This line sets up loggers basically.
if config.config_file_name is not None:
    fileConfig(config.config_file_name)

# 5. Set target_metadata
target_metadata = Base.metadata

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

    This configures the context with just a URL
    and not an Engine, though an Engine is acceptable
    here as well.  By skipping the Engine creation
    we don't even need a DBAPI to be available.

    Calls to context.execute() here emit the given string to the
    script output.

    """
    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.

    In this scenario we need to create an Engine
    and associate a connection with the context.

    """
    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()