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

# Add backend/ to path so app imports work
sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

from dotenv import load_dotenv
load_dotenv()

from app.core.database import Base

# Import all models so Alembic detects them for autogenerate
from app.models import User, Company, Employee, SalaryHistory, Loan, LoanTransaction  # noqa: F401
from app.models.payroll_run import PayrollRun, PayrollRunItem  # noqa: F401
from app.models.investment import Investment, InvestmentAttachment  # noqa: F401
from app.models.benefit import Benefit  # noqa: F401

config = context.config

# Override sqlalchemy.url from environment if available
db_url = os.getenv("DATABASE_URL")
if db_url:
    # Escape % to %% to prevent configparser interpolation errors
    config.set_main_option("sqlalchemy.url", db_url.replace("%", "%%"))

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

target_metadata = Base.metadata


def run_migrations_offline() -> None:
    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:
    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()