import asyncio
import os
import logging
import sys

from server.server import GameServer
from server.config import ServerConfig


async def _run_tasks_with_optional_timeout(tasks):
    """Await tasks, optionally honoring RUN_SECONDS env var to cancel after a timeout."""
    timeout_s = os.environ.get("RUN_SECONDS")
    if not timeout_s:
        await asyncio.gather(*tasks)
        return
    try:
        await asyncio.wait_for(asyncio.gather(*tasks), timeout=float(timeout_s))
    except asyncio.TimeoutError:
        logging.info("Timeout reached (RUN_SECONDS=%s); stopping server tasks...", timeout_s)
        for t in tasks:
            t.cancel()
        await asyncio.gather(*tasks, return_exceptions=True)


async def run_in_memory():
    from server.transport import InMemoryTransport
    cfg = ServerConfig()
    server = GameServer(transport=InMemoryTransport(lambda d, p: server.on_datagram(d, p)), config=cfg)
    tasks = [asyncio.create_task(server.transport.run()), asyncio.create_task(server.tick_loop())]
    await _run_tasks_with_optional_timeout(tasks)


async def run_quic():
    from server.quic_transport import QuicWebTransportServer
    cfg = ServerConfig()
    host = os.environ.get("QUIC_HOST", "0.0.0.0")
    port = int(os.environ.get("QUIC_PORT", "4433"))
    cert = os.environ["QUIC_CERT"]
    key = os.environ["QUIC_KEY"]
    server = GameServer(transport=QuicWebTransportServer(host, port, cert, key, lambda d, p: server.on_datagram(d, p)), config=cfg)
    tasks = [asyncio.create_task(server.transport.run()), asyncio.create_task(server.tick_loop())]
    await _run_tasks_with_optional_timeout(tasks)


async def run_webtransport():
    from server.webtransport_server import WebTransportServer
    from server.static_server import start_https_static
    cfg = ServerConfig()
    host = os.environ.get("WT_HOST", os.environ.get("QUIC_HOST", "0.0.0.0"))
    port = int(os.environ.get("WT_PORT", os.environ.get("QUIC_PORT", "4433")))
    cert = os.environ.get("WT_CERT") or os.environ["QUIC_CERT"]
    key = os.environ.get("WT_KEY") or os.environ["QUIC_KEY"]
    # Optional static HTTPS server for client assets
    static = os.environ.get("STATIC", "1")
    static_host = os.environ.get("STATIC_HOST", host)
    static_port = int(os.environ.get("STATIC_PORT", "8443"))
    static_root = os.environ.get("STATIC_ROOT", "client")
    httpd = None
    if static == "1":
        httpd, _t = start_https_static(static_host, static_port, cert, key, static_root)
        print(f"HTTPS static server: https://{static_host}:{static_port}/ serving '{static_root}'")
    server = GameServer(transport=WebTransportServer(host, port, cert, key, lambda d, p: server.on_datagram(d, p)), config=cfg)
    print(f"WebTransport server: https://{host}:{port}/ (HTTP/3)")
    try:
        tasks = [asyncio.create_task(server.transport.run()), asyncio.create_task(server.tick_loop())]
        await _run_tasks_with_optional_timeout(tasks)
    finally:
        if httpd is not None:
            httpd.shutdown()


if __name__ == "__main__":
    try:
        if any(a in ("-h", "--help") for a in sys.argv[1:]):
            print(
                "Usage: python run.py [--mode mem|quic|wt|net] [--log-level LEVEL] [--run-seconds N]\n"
                "  TLS (for wt/quic): set QUIC_CERT/QUIC_KEY or WT_CERT/WT_KEY env vars\n"
                "  WT static server (MODE=wt): STATIC=1 [STATIC_HOST/PORT/ROOT]\n"
                "Examples:\n  MODE=wt QUIC_CERT=cert.pem QUIC_KEY=key.pem python run.py\n  MODE=mem python run.py"
            )
            sys.exit(0)
        # Logging setup
        level = os.environ.get("LOG_LEVEL", "INFO").upper()
        logging.basicConfig(level=getattr(logging, level, logging.INFO), format="[%(asctime)s] %(levelname)s: %(message)s")
        mode = os.environ.get("MODE", "mem").lower()
        if mode == "wt":
            logging.info("Starting in WebTransport mode")
            asyncio.run(run_webtransport())
        elif mode == "quic":
            logging.info("Starting in QUIC datagram mode")
            asyncio.run(run_quic())
        elif mode == "net":
            logging.info("Starting in combined WebTransport+QUIC mode")
            from server.webtransport_server import WebTransportServer
            from server.quic_transport import QuicWebTransportServer
            from server.multi_transport import MultiTransport
            cfg = ServerConfig()
            host_wt = os.environ.get("WT_HOST", os.environ.get("QUIC_HOST", "0.0.0.0"))
            port_wt = int(os.environ.get("WT_PORT", os.environ.get("QUIC_PORT", "4433")))
            host_quic = os.environ.get("QUIC_HOST", host_wt)
            port_quic = int(os.environ.get("QUIC_PORT", "4443"))
            cert = os.environ.get("WT_CERT") or os.environ.get("QUIC_CERT")
            key = os.environ.get("WT_KEY") or os.environ.get("QUIC_KEY")
            if not cert or not key:
                raise SystemExit("WT/QUIC cert/key required: set WT_CERT/WT_KEY or QUIC_CERT/QUIC_KEY")
            async def _run_net():
                server: GameServer
                wt = WebTransportServer(host_wt, port_wt, cert, key, lambda d, p: server.on_datagram(d, p))
                qu = QuicWebTransportServer(host_quic, port_quic, cert, key, lambda d, p: server.on_datagram(d, p))
                m = MultiTransport(wt, qu)
                server = GameServer(transport=m, config=cfg)
                await asyncio.gather(m.run(), server.tick_loop())
            asyncio.run(_run_net())
        else:
            logging.info("Starting in in-memory transport mode")
            asyncio.run(run_in_memory())
    except KeyboardInterrupt:
        pass






async def _run_tasks_with_optional_timeout(tasks):
    """Await tasks, optionally honoring RUN_SECONDS env var to cancel after a timeout."""
    timeout_s = os.environ.get("RUN_SECONDS")
    if not timeout_s:
        await asyncio.gather(*tasks)
        return
    try:
        await asyncio.wait_for(asyncio.gather(*tasks), timeout=float(timeout_s))
    except asyncio.TimeoutError:
        logging.info("Timeout reached (RUN_SECONDS=%s); stopping server tasks...", timeout_s)
        for t in tasks:
            t.cancel()
        await asyncio.gather(*tasks, return_exceptions=True)