import asyncio
from logging.config import fileConfig

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

from alembic import context

# Import your models
from app.core.database import Base
from app.models import User, Team, Tree, Session, Attachment, InviteCode
from app.models.email_verification_token import EmailVerificationToken
from app.models.tree_embedding import TreeEmbedding
from app.models.copilot_conversation import CopilotConversation
from app.models.assistant_chat import AssistantChat
from app.models.survey_response import SurveyResponse
from app.models.survey_invite import SurveyInvite
from app.models.ai_suggestion import AISuggestion  # noqa: F401
from app.models.kb_import import KBImport, KBImportNode  # noqa: F401
from app.models.script_template import ScriptCategory, ScriptTemplate, ScriptGeneration  # noqa: F401
from app.models.psa_connection import PsaConnection  # noqa: F401
from app.models.ai_session import AISession  # noqa: F401
from app.models.ai_session_step import AISessionStep  # noqa: F401
from app.models.psa_post_log import PsaPostLog  # noqa: F401
from app.models.psa_member_mapping import PsaMemberMapping  # noqa: F401
from app.models.script_builder_session import ScriptBuilderSession, ScriptBuilderMessage  # noqa: F401
from app.models.session_branch import SessionBranch  # noqa: F401
from app.models.fork_point import ForkPoint  # noqa: F401
from app.models.session_handoff import SessionHandoff  # noqa: F401
from app.models.session_resolution_output import SessionResolutionOutput  # noqa: F401
from app.core.config import settings


def _alembic_sync_url() -> str:
    """Return a psycopg2-compatible sync URL for Alembic.

    Prefers ADMIN_DATABASE_URL (resolutionflow_admin, BYPASSRLS) converted to
    a sync driver. Falls back to DATABASE_URL_SYNC for local dev where the
    admin URL may not be configured separately.
    """
    admin_url = settings.ADMIN_DATABASE_URL
    if admin_url and "+asyncpg" in admin_url:
        return admin_url.replace("postgresql+asyncpg://", "postgresql://")
    return settings.DATABASE_URL_SYNC


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

# Override sqlalchemy.url with the sync version for migrations
config.set_main_option("sqlalchemy.url", _alembic_sync_url())

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

# add your model's MetaData object here
target_metadata = Base.metadata


def run_migrations_offline() -> None:
    """Run migrations in 'offline' mode."""
    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 do_run_migrations(connection: Connection) -> None:
    context.configure(connection=connection, target_metadata=target_metadata)

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


async def run_async_migrations() -> None:
    """Run migrations in 'online' mode with async engine."""
    from sqlalchemy.ext.asyncio import create_async_engine

    connectable = create_async_engine(
        settings.DATABASE_URL,
        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."""
    from sqlalchemy import create_engine

    connectable = create_engine(
        _alembic_sync_url(),
        poolclass=pool.NullPool,
    )

    with connectable.connect() as connection:
        do_run_migrations(connection)


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