#!/usr/bin/env python3
"""LiveKit participant for chaos-prime (Phase 1, Sept 23).

Joins the MatrixRTC LiveKit room (token via scripts/livekit_token.sh) and
publishes an audio track. Manual-trigger for now; m.call.member watch later.

Modes:
  --wav FILE          publish FILE (wav) as an audio track
  --say "text"        synthesize via MeloTTS -> RVC (Yuliko voice), then publish
  --listen SECONDS    join and print received audio track events (no publish)

Usage:
  .venv-livekit/bin/python scripts/livekit_participant.py --say "hello pierre"
"""

import argparse
import os
import subprocess
import sys
import wave
import tempfile
import asyncio

HERE = os.path.dirname(os.path.abspath(__file__))
TOKEN_SH = os.path.join(HERE, "livekit_token.sh")
MELO_PY = os.path.expanduser("~/Projects/MeloTTS/.venv/bin/python")
MELO_SERVER = os.path.join(HERE, "melo_server.py")
RVC_ROOT = "/mnt/engram/RVC1006Nvidia"
RVC_MODEL = "yuliko_proto.pth"
RVC_INDEX = os.path.join(RVC_ROOT, "logs/yuliko_proto/added_IVF401_Flat_nprobe_1_yuliko_proto_v2.index")

DEFAULT_ROOM = "!vp_58NnFUUE4dmniRdrFIuNbMaaqLrQLOzcC3UUpAi8:chaosmith.systems"


def get_jwt(room: str) -> str:
    out = subprocess.run(["bash", TOKEN_SH, room], capture_output=True, text=True, check=True)
    jwt = out.stdout.strip()
    if not jwt or jwt == "null":
        raise RuntimeError(f"token script returned nothing: {out.stderr[:500]}")
    return jwt


def synth_yuliko(text: str) -> str:
    """text -> MeloTTS PCM -> RVC (yuliko) -> wav path. Blocking, ~1-2 min."""
    # 1) Melo synth via the long-running server protocol (v2, raw PCM)
    melo = subprocess.Popen(
        [MELO_PY, MELO_SERVER], stdin=subprocess.PIPE, stdout=subprocess.PIPE
    )
    # Server handshake: READY on startup, then per-request WAV header + PCM.
    # Text must be sent BEFORE reading the header (server emits header only
    # after synthesizing).
    melo.stdin.write((text + "\n").encode())
    melo.stdin.flush()
    first = melo.stdout.readline().decode().strip()
    if first == "READY":
        first = melo.stdout.readline().decode().strip()
    header = first.split()
    assert header and header[0] == "WAV", f"melo protocol error: {header}"
    n_bytes, rate = int(header[1]), int(header[2])
    pcm = b""
    while len(pcm) < n_bytes:
        chunk = melo.stdout.read(n_bytes - len(pcm))
        if not chunk:
            break
        pcm += chunk
    melo.stdin.close()
    melo.wait(timeout=30)

    tmp_in = tempfile.NamedTemporaryFile(suffix=".wav", delete=False)
    with wave.open(tmp_in.name, "wb") as w:
        w.setnchannels(1)
        w.setsampwidth(2)
        w.setframerate(rate)
        w.writeframes(pcm)

    # 2) RVC convert (run from RVC root so relative asset paths resolve).
    # infer_batch_rvc works on DIRECTORIES: input_path = dir of wavs,
    # opt_path = output dir.
    in_dir = tempfile.mkdtemp(prefix="rvc_in_")
    out_dir = tempfile.mkdtemp(prefix="rvc_out_")
    os.rename(tmp_in.name, os.path.join(in_dir, "in.wav"))
    subprocess.run(
        [
            MELO_PY, "tools/infer_batch_rvc.py",
            "--f0up_key", "0",
            "--input_path", in_dir,
            "--index_path", RVC_INDEX,
            "--f0method", "rmvpe",
            "--opt_path", out_dir,
            "--model_name", RVC_MODEL,
            "--index_rate", "0.66",
            "--device", "cuda:0",
            "--is_half", "True",
            "--filter_radius", "3",
            "--rms_mix_rate", "1",
            "--protect", "0.33",
        ],
        cwd=RVC_ROOT, check=True, capture_output=True,
    )
    result = os.path.join(out_dir, "in.wav")
    return result


def wav_source(path: str):
    """Blocking wav -> AudioSource generator (16kHz mono s16)."""
    from livekit import rtc

    with wave.open(path, "rb") as w:
        rate, n = w.getframerate(), w.getnframes()
        frames = w.readframes(n)

    source = rtc.AudioSource(rate, 1)
    frame_bytes = rate * 2 // 50  # 20ms chunks
    async def _run():
        for i in range(0, len(frames), frame_bytes):
            chunk = frames[i:i + frame_bytes]
            f = rtc.AudioFrame(
                data=chunk, sample_rate=rate, num_channels=1,
                samples_per_channel=len(chunk) // 2,
            )
            await source.capture_frame(f)
            await asyncio.sleep(0.02)
    return source, _run


async def amain(args):
    from livekit import rtc

    url = "wss://livekit.chaosmith.systems"
    jwt = get_jwt(args.room)
    room = rtc.Room()

    @room.on("track_subscribed")
    def on_track(track, pub, participant):
        print(f"[participant] subscribed: {track.kind} from {participant.identity}")
        if track.kind == rtc.TrackKind.KIND_AUDIO and args.listen:
            stream = rtc.AudioStream(track)
            async def _drain():
                async for ev in stream:
                    pass  # Phase 2: feed whisper STT here
            asyncio.ensure_future(_drain())

    await room.connect(url, jwt)
    print(f"[participant] connected to {args.room} as {room.local_participant.identity}")

    published = None
    if args.wav:
        src_path = args.wav
    elif args.say:
        print("[participant] synthesizing Yuliko voice...")
        src_path = synth_yuliko(args.say)
        print(f"[participant] synthesized: {src_path}")
    else:
        src_path = None

    if src_path:
        source, runner = wav_source(src_path)
        track = rtc.LocalAudioTrack.create_audio_track("chaos-prime-voice", source)
        opts = rtc.TrackPublishOptions()
        opts.source = rtc.TrackSource.SOURCE_MICROPHONE
        published = await room.local_participant.publish_track(track, opts)
        print("[participant] audio track published")
        await runner()

    if args.listen:
        print(f"[participant] listening for {args.listen}s...")
        await asyncio.sleep(args.listen)
    elif published:
        await asyncio.sleep(2)  # let the tail flush

    await room.disconnect()
    print("[participant] disconnected")


def main():
    p = argparse.ArgumentParser()
    p.add_argument("--room", default=DEFAULT_ROOM)
    p.add_argument("--wav")
    p.add_argument("--say")
    p.add_argument("--listen", type=int, default=0)
    args = p.parse_args()
    if not (args.wav or args.say or args.listen):
        p.error("one of --wav / --say / --listen required")
    asyncio.run(amain(args))


if __name__ == "__main__":
    main()