# Copyright (c) Meta Platforms, Inc. and affiliates.
# All rights reserved.
#
# This source code is licensed under the BSD-style license found in the
# LICENSE file in the root directory of this source tree.

"""
FastAPI application for the Supergames Environment.

This module creates an HTTP server that exposes the SupergamesEnvironment
over HTTP and WebSocket endpoints, compatible with EnvClient.

Endpoints:
    - POST /reset: Reset the environment
    - POST /step: Execute an action
    - GET /state: Get current environment state
    - GET /schema: Get action/observation schemas
    - WS /ws: WebSocket endpoint for persistent sessions

Usage:
    # Development (with auto-reload):
    uvicorn server.app:app --reload --host 0.0.0.0 --port 8000

    # Production:
    uvicorn server.app:app --host 0.0.0.0 --port 8000 --workers 4

    # Or run directly:
    python -m server.app
"""

from pathlib import Path

from fastapi.responses import FileResponse
from fastapi.staticfiles import StaticFiles

try:
    from openenv.core.env_server import http_server as openenv_http_server
except Exception as e:  # pragma: no cover
    raise ImportError(
        "openenv is required for the web interface. Install dependencies with '\n    uv sync\n'"
    ) from e

try:
    from ..models import SupergamesAction, SupergamesObservation
except ImportError:
    import sys, os
    sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..'))
    from models import SupergamesAction, SupergamesObservation

try:
    from .environment import SupergamesEnvironment
except ModuleNotFoundError:
    from supergames.server.environment import SupergamesEnvironment


# Create the app with web interface and README integration
if not hasattr(openenv_http_server, "_supergames_serialize_observation"):
    openenv_http_server._supergames_serialize_observation = (
        openenv_http_server.serialize_observation
    )
_serialize_observation = openenv_http_server._supergames_serialize_observation


def _serialize_supergames_observation(observation):
    payload = _serialize_observation(observation)
    metadata = payload.setdefault("observation", {}).setdefault("metadata", {})
    reasoning = observation.metadata.get("agent_reasoning")
    if reasoning:
        metadata["agent_reasoning"] = reasoning
    sprint_summary = observation.metadata.get("sprint_summary")
    if sprint_summary:
        metadata["sprint_summary"] = sprint_summary
    return payload


openenv_http_server.serialize_observation = _serialize_supergames_observation

app = openenv_http_server.create_app(
    SupergamesEnvironment,
    SupergamesAction,
    SupergamesObservation,
    env_name="supergames",
    max_concurrent_envs=1,  # increase this number to allow more concurrent WebSocket sessions
)

_STATIC_DIR = Path(__file__).with_name("static")
_INDEX_HTML = _STATIC_DIR / "index.html"


@app.get("/", include_in_schema=False)
@app.get("/web", include_in_schema=False)
async def web_index():
    return FileResponse(_INDEX_HTML)


app.mount("/web", StaticFiles(directory=_STATIC_DIR, html=True), name="web")


def main(host: str = "0.0.0.0", port: int = 8000):
    """
    Entry point for direct execution via uv run or python -m.

    This function enables running the server without Docker:
        uv run --project . server
        uv run --project . server --port 8001
        python -m supergames.server.app

    Args:
        host: Host address to bind to (default: "0.0.0.0")
        port: Port number to listen on (default: 8000)

    For production deployments, consider using uvicorn directly with
    multiple workers:
        uvicorn supergames.server.app:app --workers 4
    """
    import uvicorn

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


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