import asyncio
from logging.config import fileConfig

from alembic import context
from sqlalchemy import pool
from sqlalchemy.engine import Connection
from sqlalchemy.ext.asyncio import async_engine_from_config

import cartoonos.db.economics_models
import cartoonos.db.golden_shot_models
import cartoonos.db.learning_models
import cartoonos.db.models
import cartoonos.db.monetization_models
import cartoonos.db.operating_models
import cartoonos.db.production_artifact_models
import cartoonos.db.release_models
import cartoonos.db.runtime_models  # noqa: F401 - register project-scoped runtime models
from cartoonos.config import get_settings
from cartoonos.db.base import Base

from cartoonos.db.session import normalize_async_database_url

config = context.config

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

target_metadata = Base.metadata


def get_url() -> str:
    url = config.get_main_option("sqlalchemy.url")
    if not url:
        url = get_settings().database_url
    return normalize_async_database_url(str(url))


def prepare_revision_storage() -> None:
    """Preserve descriptive revision IDs on PostgreSQL, including existing installs.

    Alembic defaults to VARCHAR(32); our immutable history includes longer IDs.
    SQLite does not enforce that length, so only a PostgreSQL run exposes this.
    This infrastructure preparation must precede revision 008, not follow it.
    """
    if context.get_context().dialect.name == "postgresql":
        context.execute(
            "CREATE TABLE IF NOT EXISTS alembic_version "
            "(version_num VARCHAR(128) NOT NULL PRIMARY KEY)"
        )
        context.execute("ALTER TABLE alembic_version ALTER COLUMN version_num TYPE VARCHAR(128)")


def run_migrations_offline() -> None:
    """Run migrations in 'offline' mode."""
    url = get_url()
    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )

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


def do_run_migrations(connection: Connection) -> None:
    context.configure(connection=connection, target_metadata=target_metadata)

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


async def run_async_migrations() -> None:
    """Run migrations in 'online' mode using an async engine."""
    configuration = config.get_section(config.config_ini_section, {})
    configuration["sqlalchemy.url"] = get_url()

    connectable = async_engine_from_config(
        configuration,
        prefix="sqlalchemy.",
        poolclass=pool.NullPool,
    )

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

    await connectable.dispose()


def run_migrations_online() -> None:
    """Run migrations in 'online' mode, supporting both async and sync engines."""
    url = get_url()
    if "+psycopg" in url or "+aiosqlite" in url or "+asyncmy" in url or "async" in url:
        asyncio.run(run_async_migrations())
    else:
        from sqlalchemy import create_engine

        connectable = create_engine(url, poolclass=pool.NullPool)
        with connectable.connect() as connection:
            do_run_migrations(connection)
        connectable.dispose()


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