# 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 Doc Quality Env Environment.

This module creates an HTTP server that exposes the DocQualityEnvironment
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
"""

try:
    from openenv.core.env_server.http_server import create_app
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:
    # Try relative imports first (when running as a package)
    from ..models import DocQualityAction, DocQualityObservation
    from .doc_quality_env_environment import DocQualityEnvironment
except (ModuleNotFoundError, ImportError, ValueError):
    # Fallback to absolute imports
    try:
        from doc_quality_env.models import DocQualityAction, DocQualityObservation
        from doc_quality_env.server.doc_quality_env_environment import (
            DocQualityEnvironment,
        )
    except ModuleNotFoundError:
        # Last resort: direct imports for development
        import sys
        import os

        sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
        from models import DocQualityAction, DocQualityObservation
        from doc_quality_env_environment import DocQualityEnvironment


# Create the app with web interface and README integration
app = create_app(
    DocQualityEnvironment,
    DocQualityAction,
    DocQualityObservation,
    env_name="doc_quality_env",
    max_concurrent_envs=1,  # increase this number to allow more concurrent WebSocket sessions
)


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 doc_quality_env.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 doc_quality_env.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()
    main(port=args.port)