"""Alembic migration environment configuration."""

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

from sqlalchemy import pool
from sqlalchemy.engine import Connection
from sqlalchemy.ext.asyncio import async_engine_from_config
from sqlmodel import SQLModel

from alembic import context

# Add src to path for imports
sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "src"))

# Import all models to register them with SQLModel.metadata
from database.models import (  # noqa: F401
    CacheMeta,
    EmailCache,
    EventCache,
    ContactCache,
    SyncState,
)

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

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

# SQLModel metadata for autogenerate
target_metadata = SQLModel.metadata

# Get database URL from environment or config
def get_url() -> str:
    """Get database URL from environment variable or config."""
    sqlite_path = os.environ.get("SQLITE_PATH", "data/cache.db")
    return f"sqlite+aiosqlite:///{sqlite_path}"


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

    This configures the context with just a URL and not an Engine.
    Calls to context.execute() emit the SQL to the script output.
    """
    url = get_url()
    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
        render_as_batch=True,  # Required for SQLite ALTER TABLE support
    )

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


def do_run_migrations(connection: Connection) -> None:
    """Run migrations with the given connection."""
    context.configure(
        connection=connection,
        target_metadata=target_metadata,
        render_as_batch=True,  # Required for SQLite ALTER TABLE support
    )

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


async def run_async_migrations() -> None:
    """Run migrations in 'online' mode with async engine."""
    configuration = config.get_section(config.config_ini_section) or {}
    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."""
    asyncio.run(run_async_migrations())


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