"""FastAPI application for the LeanMigrate OpenEnv environment."""

from __future__ import annotations

import argparse

try:
    from openenv.core.env_server.http_server import create_app
except Exception as error:  # pragma: no cover
    raise ImportError(
        "openenv-core is required for the web interface. Run `uv sync` first."
    ) from error

from ..env.models import LeanMigrateAction, LeanMigrateObservation
from .lean_migrate_environment import LeanMigrateEnvironment


app = create_app(
    LeanMigrateEnvironment,
    LeanMigrateAction,
    LeanMigrateObservation,
    env_name="lean_migrate",
    # Allow concurrent sessions — LeanMigrateEnvironment is stateless per episode.
    max_concurrent_envs=8,
)


def main(host: str = "0.0.0.0", port: int = 8000) -> None:
    import uvicorn

    uvicorn.run(app, host=host, port=port)


if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument("--port", type=int, default=8000)
    args = parser.parse_args()
    if args.port == 8000:
        main()
    else:
        main(port=args.port)