import asyncio
from logging.config import fileConfig
import os
import sys

from sqlalchemy import engine_from_config
from sqlalchemy import pool, text
from sqlalchemy.ext.asyncio import AsyncEngine
from alembic import context
from src.core.config import settings
from src.models import *
# this is the Alembic Config object, which provides
# access to the values within the .ini file in use.
config = context.config

# 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)

config.set_main_option("sqlalchemy.url", settings.OPENBAO.DATABASE.DATABASE_URL)
# add your model's MetaData object here
# for 'autogenerate' support
# from myapp import mymodel
# target_metadata = mymodel.Base.metadata
target_metadata = Base.metadata
db_schema = settings.OPENBAO.DATABASE.DATABASE_SCHEMA

# other values from the config, defined by the needs of env.py,
# can be acquired:
# my_important_option = config.get_main_option("my_important_option")
# ... etc.
x_args = context.get_x_argument(as_dictionary=True)
env_name = x_args.get("env") or os.getenv("APP_ENV") or "dev"


if env_name == "prod":
    answer = input(
        "\n>>> You are about to run migrations against PROD.\n"
        ">>> Type 'yes' to continue: "
    )
    if answer.strip().lower() != "yes":
        print("Aborted.")
        sys.exit(1)


def include_object(obj, name, type_, reflected, compare_to):
    """Ignore anything outside the current schema during autogenerate."""
    obj_schema = getattr(obj, "schema", None)
    if obj_schema is not None and obj_schema != db_schema:
        return False
    return True


def do_run_migrations(connection) -> None:
    connection.execute(text(f'CREATE SCHEMA IF NOT EXISTS "{db_schema}"'))
    connection.execute(text(f'SET search_path TO "{db_schema}"'))
    connection.commit()
    context.configure(
        connection=connection,
        target_metadata=target_metadata,
        compare_type=True,
        compare_server_default=True,
        version_table_schema=db_schema,
        include_schemas=False,
        include_object=include_object,
    )

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

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"},
        version_table_schema="dkb",
        include_schemas=True,
    )

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


async 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 = AsyncEngine(
        engine_from_config(
            config.get_section(config.config_ini_section),
            prefix="sqlalchemy.",
            poolclass=pool.NullPool,
            future=True
        )
    )

    async with connectable.connect() as connection:
        await connection.run_sync(do_run_migrations)

    await connectable.dispose()


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