#!/usr/bin/env python3
"""Send v1 JSON to drivers via the bridge (broadcast passthrough).

The simplified ``espnow-sender`` forwards each WebSocket message unchanged to
ESP-NOW ``ff:ff:ff:ff:ff:ff``. Drivers accept JSON when the payload starts with
``{`` (see ``led-driver/src/main.py``).

Examples::

  pipenv run python tests/bridge_broadcast_test.py

  pipenv run python tests/bridge_broadcast_test.py --url ws://192.168.4.1/ws

  pipenv run python tests/bridge_broadcast_test.py --brightness 200

  pipenv run python tests/bridge_broadcast_test.py --select led-abc --state on
"""

from __future__ import annotations

import argparse
import asyncio
import json
import sys
from pathlib import Path

PROJECT_ROOT = Path(__file__).resolve().parents[1]
sys.path.insert(0, str(PROJECT_ROOT / "src"))

from util.espnow_message import build_message  # noqa: E402


def _load_bridge_url(explicit: str | None) -> str:
    if explicit and explicit.strip():
        return explicit.strip()
    path = PROJECT_ROOT / "settings.json"
    if path.is_file():
        try:
            data = json.loads(path.read_text(encoding="utf-8"))
            url = str(data.get("bridge_ws_url") or "").strip()
            if url:
                return url
        except (OSError, json.JSONDecodeError, TypeError):
            pass
    return "ws://192.168.4.1/ws"


async def _send_messages(url: str, messages: list[bytes], delay_s: float) -> None:
    import websockets

    print(f"connecting to {url}")
    async with websockets.connect(url, ping_interval=20, ping_timeout=20) as ws:
        print("connected (broadcast JSON passthrough)")
        for i, pkt in enumerate(messages):
            preview = pkt[:80].decode("utf-8", errors="replace")
            if len(pkt) > 80:
                preview += "…"
            print(f"  send [{i + 1}/{len(messages)}] {len(pkt)} B {preview!r}")
            await ws.send(pkt)
            if delay_s > 0 and i + 1 < len(messages):
                await asyncio.sleep(delay_s)
        print("done")


def _build_messages(args: argparse.Namespace) -> list[bytes]:
    messages: list[bytes] = []

    if args.brightness is not None:
        body: dict = {
            "v": "1",
            "b": max(0, min(255, int(args.brightness))),
        }
        if args.save:
            body["save"] = True
        messages.append(json.dumps(body, separators=(",", ":")).encode("utf-8"))

    if args.select:
        messages.append(
            build_message(
                select={args.select: [args.state]},
                save=args.save,
            ).encode("utf-8")
        )

    if args.off:
        if args.select:
            messages.append(
                build_message(select={args.select: ["off"]}, save=args.save).encode("utf-8")
            )
        else:
            messages.append(
                build_message(select={"all": ["off"]}, save=args.save).encode("utf-8")
            )

    if not messages:
        messages.append(
            json.dumps({"v": "1", "b": 128}, separators=(",", ":")).encode("utf-8")
        )
        messages.append(
            build_message(select={"all": ["on"]}).encode("utf-8")
        )
        messages.append(
            build_message(select={"all": ["off"]}).encode("utf-8")
        )

    for pkt in messages:
        if not pkt or pkt[0:1] != b"{":
            raise ValueError("built message is not v1 JSON")
    return messages


def main() -> int:
    parser = argparse.ArgumentParser(
        description="Broadcast v1 JSON to LED drivers through the bridge WebSocket.",
    )
    parser.add_argument(
        "--url",
        default=None,
        help="Bridge WebSocket URL (default: settings.json bridge_ws_url or ws://192.168.4.1/ws)",
    )
    parser.add_argument(
        "--delay",
        type=float,
        default=0.5,
        help="Seconds between messages (default: 0.5)",
    )
    parser.add_argument(
        "--brightness",
        "-b",
        type=int,
        default=None,
        metavar="0-255",
        help="Global brightness (b field)",
    )
    parser.add_argument(
        "--select",
        metavar="DEVICE_NAME",
        help="Device name in select map (must match driver settings name)",
    )
    parser.add_argument(
        "--state",
        default="on",
        help="Pattern/state for --select (default: on)",
    )
    parser.add_argument(
        "--off",
        action="store_true",
        help="Send select off (all devices if --select omitted)",
    )
    parser.add_argument(
        "--save",
        action="store_true",
        help="Set save flag on messages",
    )
    parser.add_argument(
        "--dry-run",
        action="store_true",
        help="Print messages only; do not connect",
    )
    args = parser.parse_args()

    url = _load_bridge_url(args.url)
    try:
        messages = _build_messages(args)
    except ValueError as e:
        print(f"error: {e}", file=sys.stderr)
        return 1

    print(f"url={url!r} messages={len(messages)}")
    for pkt in messages:
        print(f"  {pkt.decode('utf-8')}")

    if args.dry_run:
        return 0

    try:
        asyncio.run(_send_messages(url, messages, args.delay))
    except KeyboardInterrupt:
        print("interrupted")
        return 130
    except Exception as e:
        print(f"failed: {e!r}", file=sys.stderr)
        return 1
    return 0


if __name__ == "__main__":
    raise SystemExit(main())