"""NVIDIA NIM container install / lifecycle.

Two pieces:
  * A small curated catalog of NIM images (so users don't have to copy/paste
    huge nvcr.io URLs).
  * An installer that SSHes into the target Spark, runs `docker pull` then
    `docker run -d --gpus all -p PORT:PORT -v VOLUME:/opt/nim/.cache
    -e NGC_API_KEY=... IMAGE` and streams output.

Custom services also persist via `overrides.add_custom_service()` so the
Services panel can show them.
"""
from __future__ import annotations
import asyncio
import uuid
from dataclasses import dataclass, field
from datetime import datetime, timezone
from typing import Optional

from .config import Settings
from .ssh import ssh_stream, StreamHandle


# Curated list. These are the most useful NIM containers for a dual-Spark
# audio-and-LLM setup. Browse the full catalog at
# https://catalog.ngc.nvidia.com/orgs/nim/teams/nvidia
CATALOG_URL = "https://catalog.ngc.nvidia.com/orgs/nim/teams/nvidia/containers"


SUGGESTED_NIMS: list[dict] = [
    {
        "key": "parakeet-tdt-0.6b-v3",
        "name": "Parakeet TDT 0.6B v3",
        "image": "nvcr.io/nim/nvidia/parakeet-tdt-0-6b-v3:latest",
        "default_container": "parakeet-asr",
        "default_port": 8000,
        "kind": "stt",
        "description": "Streaming speech-to-text (English). Used by Open WebUI for voice input. ~1 GB.",
        "homepage": "https://catalog.ngc.nvidia.com/orgs/nim/teams/nvidia/containers/parakeet-tdt-0-6b-v3",
    },
    {
        "key": "riva-multilingual",
        "name": "Riva Multilingual ASR",
        "image": "nvcr.io/nim/nvidia/riva-multilingual:latest",
        "default_container": "riva-asr",
        "default_port": 8001,
        "kind": "stt",
        "description": "NVIDIA Riva speech-recognition multi-language model. Larger and more accurate than Parakeet.",
        "homepage": "https://catalog.ngc.nvidia.com/orgs/nim/teams/nvidia",
    },
]


@dataclass
class NimInstallJob:
    id: str
    image: str
    container: str
    port: int
    host: str
    user: str
    volume: Optional[str]
    started_at: str
    state: str = "starting"   # starting | pulling | running | done | failed
    phase: str = "Starting…"
    lines: list[str] = field(default_factory=list)
    returncode: Optional[int] = None
    finished_at: Optional[str] = None

    def append(self, line: str) -> None:
        self.lines.append(line)
        if len(self.lines) > 1000:
            del self.lines[: len(self.lines) - 1000]


class NimManager:
    def __init__(self, settings: Settings) -> None:
        self.settings = settings
        self.lock = asyncio.Lock()
        self.jobs: dict[str, NimInstallJob] = {}
        self.current_job_id: Optional[str] = None

    def get(self, job_id: str) -> NimInstallJob | None:
        return self.jobs.get(job_id)

    async def trigger(
        self,
        *,
        image: str,
        container: str,
        port: int,
        host: str,
        user: str,
        volume: str | None = None,
        extra_env: dict[str, str] | None = None,
    ) -> NimInstallJob:
        if self.lock.locked():
            raise RuntimeError("Another NIM install is already in progress")
        if not host or not user:
            raise RuntimeError("target host not configured")
        if not self.settings.ngc_api_key:
            raise RuntimeError(
                "NGC_API_KEY is not set. Open Configure Sparks in StartOS and paste your NGC personal API key (free at https://ngc.nvidia.com/setup/personal-key)."
            )

        job = NimInstallJob(
            id=uuid.uuid4().hex[:8],
            image=image,
            container=container,
            port=port,
            host=host,
            user=user,
            volume=volume or f"{container}-cache",
            started_at=datetime.now(timezone.utc).isoformat(),
        )
        self.jobs[job.id] = job
        self.current_job_id = job.id
        asyncio.create_task(self._run(job, extra_env or {}))
        return job

    async def _run(self, job: NimInstallJob, extra_env: dict[str, str]) -> None:
        async with self.lock:
            try:
                await self._do(job, extra_env)
                if job.state != "failed":
                    job.state = "done"
                    job.returncode = 0
                    job.phase = "Done"
            except Exception as e:
                job.append(f"[error] {type(e).__name__}: {e}")
                job.state = "failed"
                if job.returncode is None:
                    job.returncode = 1
            finally:
                job.finished_at = datetime.now(timezone.utc).isoformat()
                if self.current_job_id == job.id:
                    self.current_job_id = None

    async def _do(self, job: NimInstallJob, extra_env: dict[str, str]) -> None:
        # Build the bash one-liner. We use docker login non-interactively with the NGC API key.
        env_parts = [f'-e NGC_API_KEY=$NGC_API_KEY']
        for k, v in extra_env.items():
            env_parts.append(f"-e {k}={v}")
        env_str = " ".join(env_parts)
        cmd = (
            f"set -e; "
            f"export NGC_API_KEY='{self.settings.ngc_api_key}'; "
            f"echo '=== docker login nvcr.io ==='; "
            f"echo \"$NGC_API_KEY\" | docker login nvcr.io -u '$oauthtoken' --password-stdin; "
            f"echo '=== docker pull {job.image} (this can be 1-10 GB) ==='; "
            f"docker pull {job.image}; "
            f"echo '=== remove any prior container with the same name ==='; "
            f"docker rm -f {job.container} 2>/dev/null || true; "
            f"echo '=== docker run -d --gpus all -p {job.port}:{job.port} -v {job.volume}:/opt/nim/.cache {env_str} --name {job.container} --restart unless-stopped {job.image} ==='; "
            f"docker run -d --gpus all "
            f"-p {job.port}:{job.port} "
            f"-v {job.volume}:/opt/nim/.cache "
            f"{env_str} "
            f"--name {job.container} "
            f"--restart unless-stopped "
            f"{job.image}; "
            f"echo '=== ensuring cache volume is writable by uid 1000 (riva-server) ==='; "
            f"docker run --rm -v {job.volume}:/cache alpine chown -R 1000:1000 /cache && "
            f"docker restart {job.container}; "
            f"echo '=== install complete; container is starting up and will download its model on first boot ==='"
        )
        job.append(f"$ <install command for {job.image} on {job.host}>")
        job.state = "pulling"
        job.phase = "Pulling image from nvcr.io (this can take a few minutes)…"

        handle = StreamHandle()
        async for line in ssh_stream(job.host, job.user, cmd, self.settings, handle=handle):
            # Don't log lines containing the api key
            if self.settings.ngc_api_key and self.settings.ngc_api_key in line:
                continue
            job.append(line)
            if "docker pull" in line:
                job.phase = "Pulling image from nvcr.io…"
            elif "Login Succeeded" in line:
                job.phase = "Logged in to NGC; pulling image…"
            elif "Pull complete" in line:
                job.phase = "Pulling layers…"
            elif "Status: Downloaded newer image" in line or "Image is up to date" in line:
                job.phase = "Image ready; starting container…"
            elif "docker run -d" in line:
                job.state = "running"
                job.phase = "Container starting; downloading model on first boot…"

        rc = handle.returncode or 0
        if rc != 0:
            job.state = "failed"
            job.returncode = rc