#!/usr/bin/env python
"""Bootstrap ai-toolkit training for the Qwen-Image-2.1 RGBA orbit LoRA.

Runs inside the job container:
  1. clone ostris/ai-toolkit (main), install the system libs cv2 needs
     (libGL / glib — the uv base image lacks them), pip install requirements,
     then install torchaudio (imported unconditionally by
     toolkit/config_modules.py but absent from ai-toolkit requirements)
     and trackio (loss dashboard)
  2. materialize targets/ + controls/ from the mounted dataset repo (/ds)
     with the transparency sentence appended (won the caption A/B)
  3. write the training YAML (qwen_image_2 arch, rgba: true, rank 32)
  4. launch `python run.py <yaml>`, teeing stdout to /work/train_stdout.log
  5. side thread parses the tqdm loss lines from that stdout and pushes
     loss -> Trackio. (ai-toolkit's UI logger writes loss_log.db but leaves
     the metrics table empty until process exit, so stdout is the source.)
  6. on success, upload every saved .safetensors PLUS train_stdout.log and a
     loss dump (loss_log.jsonl) to the Hub repo — the job log API truncates
     its middle, so the loss curve must live on the Hub.

Timing note: wall clock around run.py includes model load + latent caching,
so the real s/step is taken from the tqdm elapsed clock, not from t0.

Usage:
  python run_ai_toolkit.py --steps 50 --resolution 768 \
      --trackio-space ysharma/<space_id>

Env: HF_TOKEN (required for upload), dataset repo mounted read-only at /ds.
"""
import argparse
import glob
import json
import os
import re
import sqlite3
import subprocess
import sys
import threading
import time
from pathlib import Path

DS_ROOT = Path("/ds")
AITK_URL = "https://github.com/ostris/ai-toolkit.git"
WORK = Path("/work")
LORA_REPO = "ysharma/orbit-alpha-lora"
PROJECT = "qwen21-rgba-orbit-lora"

TQDM_RE = re.compile(r"(\d+)/(\d+) \[(\d+):(\d+)<[^\]]*?loss: ([0-9.eE+-]+)")

YAML_TEMPLATE = """\
job: extension
config:
  name: "orbit_alpha_lora"
  process:
    - type: 'sd_trainer'
      training_folder: "/work/output"
      device: cuda:0
      network:
        type: "lora"
        linear: 32
        linear_alpha: 32
      save:
        dtype: float16
        save_every: __SAVE_EVERY__
        max_step_saves_to_keep: __MAX_SAVES__
        push_to_hub: false
      datasets:
        - folder_path: "/work/train_data/targets"
          control_path: "/work/train_data/controls"
          caption_ext: "txt"
          caption_dropout_rate: 0.0
          cache_latents_to_disk: true
          resolution: [__RES__]
      train:
        batch_size: 1
        cache_text_embeddings: true
        steps: __STEPS__
        gradient_accumulation: 1
        timestep_type: "weighted"
        train_unet: true
        train_text_encoder: false
        gradient_checkpointing: true
        noise_scheduler: "flowmatch"
        optimizer: "adamw8bit"
        lr: 1e-4
        disable_sampling: true
        dtype: bf16
      model:
        name_or_path: "Qwen/Qwen-Image-2.1"
        arch: "qwen_image_2"
        quantize: false
        low_vram: false
        model_kwargs:
          rgba: true
      logging:
        log_every: 1
        use_ui_logger: true
meta:
  name: "[name]"
  version: "1.0"
"""


def sh(cmd, **kw):
    print(f"\n+ {' '.join(cmd) if isinstance(cmd, list) else cmd}", flush=True)
    return subprocess.run(cmd, shell=isinstance(cmd, str), check=True, **kw)


def install_system_libs():
    """cv2 (ai-toolkit dependency) needs libGL.so.1 + glib at import time."""
    r1 = subprocess.run(["apt-get", "update"], capture_output=True, text=True)
    r2 = subprocess.run(["apt-get", "install", "-y", "libgl1", "libglib2.0-0"],
                        capture_output=True, text=True)
    if r2.returncode == 0:
        print("[apt] libgl1 + libglib2.0-0 installed", flush=True)
        return
    print(f"[apt] failed ({r2.stderr[-300:]}); forcing opencv-python-headless",
          flush=True)
    sh([sys.executable, "-m", "pip", "install", "--force-reinstall",
        "--no-deps", "opencv-python-headless"])


def install_aitk_deps(aitk):
    sh([sys.executable, "-m", "pip", "install", "-r",
        str(aitk / "requirements.txt")], cwd=str(aitk))
    # ai-toolkit's toolkit/config_modules.py does `import torchaudio` at module
    # import time, but requirements.txt does not list it. Install it after the
    # requirements so pip resolves a build compatible with the torch already
    # installed. trackio feeds the loss dashboard from the tail thread.
    sh([sys.executable, "-m", "pip", "install", "torchaudio", "trackio"])
    v = subprocess.run([sys.executable, "-m", "pip", "show", "trackio"],
                       capture_output=True, text=True).stdout
    print("[deps] " + " | ".join(l.strip() for l in v.splitlines()
                                 if l.startswith(("Name", "Version"))), flush=True)


def materialize():
    cmd = [sys.executable, str(DS_ROOT / "materialize_pairs.py"),
           "--pairs", str(DS_ROOT / "pairs_train.jsonl"),
           "--renders", str(DS_ROOT),
           "--out", "/work/train_data", "--alpha-suffix"]
    sh(cmd)
    for sub in ("targets", "controls"):
        n = len(glob.glob(f"/work/train_data/{sub}/*"))
        assert n > 0, f"materialized {sub} folder is empty"
        print(f"{sub}: {n} files")


def parse_tqdm(text):
    """[(step, total, elapsed_s, loss), ...] from tqdm lines, last wins."""
    out = {}
    for m in TQDM_RE.finditer(text):
        step, total, mm, ss, loss = m.groups()
        out[int(step)] = (int(step), int(total), int(mm) * 60 + int(ss),
                          float(loss))
    return out


def tail_loss_to_trackio(space_id, stop_event, state):
    """Tail the trainer's stdout log and push per-step loss to Trackio."""
    import trackio
    trackio.init(project=PROJECT, space_id=space_id)
    logged = set()
    while not stop_event.is_set():
        try:
            text = Path("/work/train_stdout.log").read_text(errors="ignore")
            found = parse_tqdm(text)
            for step in sorted(found):
                if step in logged:
                    continue
                _, _, _, loss = found[step]
                trackio.log({"loss": loss}, step=step)
                logged.add(step)
                state["last_step"] = step
                state["last_loss"] = loss
        except Exception as e:
            print(f"[tail] {type(e).__name__}: {e}", flush=True)
        time.sleep(10)
    trackio.finish()


def dump_loss_stdout():
    """Dump the parsed tqdm loss curve to JSONL (the reliable source)."""
    text = Path("/work/train_stdout.log").read_text(errors="ignore")
    found = parse_tqdm(text)
    out = Path("/work/loss_log.jsonl")
    with open(out, "w") as f:
        for step in sorted(found):
            _, total, elapsed, loss = found[step]
            f.write(json.dumps({"step": step, "loss": loss,
                                "elapsed_s": elapsed}) + "\n")
    print(f"[dump] {len(found)} loss rows -> {out}", flush=True)
    return out


def dump_loss_db():
    """Dump the metrics table of loss_log.db to JSONL (best-effort backup)."""
    hits = glob.glob("/work/output/**/loss_log.db", recursive=True)
    if not hits:
        return None
    out = Path("/work/loss_db.jsonl")
    n = 0
    with open(out, "w") as f, sqlite3.connect(f"file:{hits[0]}?mode=ro", uri=True) as conn:
        cols = [r[1] for r in conn.execute("PRAGMA table_info(metrics)").fetchall()]
        if not cols:
            return None
        vcol = ("value" if "value" in cols
                else "value_text" if "value_text" in cols else cols[-1])
        for step, key, val in conn.execute(
                f"SELECT step, key, {vcol} FROM metrics ORDER BY step"):
            try:
                val = float(val)
            except (TypeError, ValueError):
                continue
            f.write(json.dumps({"step": step, "key": key, "value": val}) + "\n")
            n += 1
    print(f"[dump] {n} sqlite metric rows -> {out}", flush=True)
    return out


def upload_artifacts(run_name, extra_files=()):
    from huggingface_hub import HfApi
    api = HfApi()
    dest = f"checkpoints/{run_name}"
    for path, rel in extra_files:
        if path and Path(path).exists():
            api.upload_file(path_or_fileobj=path, path_in_repo=f"{dest}/{rel}",
                            repo_id=LORA_REPO, repo_type="model")
            print(f"[upload] {rel} -> {LORA_REPO}/{dest}/{rel}", flush=True)
    ckpts = sorted(glob.glob("/work/output/**/*.safetensors", recursive=True))
    assert ckpts, "no .safetensors found under /work/output"
    for c in ckpts:
        rel = os.path.relpath(c, "/work/output")
        api.upload_file(path_or_fileobj=c, path_in_repo=f"{dest}/{rel}",
                        repo_id=LORA_REPO, repo_type="model")
        print(f"[upload] {rel} -> {LORA_REPO}/{dest}/{rel}", flush=True)


def main():
    ap = argparse.ArgumentParser()
    ap.add_argument("--steps", type=int, required=True)
    ap.add_argument("--save-every", type=int, default=0)
    ap.add_argument("--resolution", type=int, default=768)
    ap.add_argument("--max-saves", type=int, default=10)
    ap.add_argument("--trackio-space", required=True)
    args = ap.parse_args()
    save_every = args.save_every or args.steps
    run_name = f"steps{args.steps}res{args.resolution}"
    state = {"last_step": -1, "last_loss": None}

    # 1. ai-toolkit
    aitk = WORK / "ai-toolkit"
    if not aitk.exists():
        subprocess.run(["git", "clone", "--depth", "1", AITK_URL, str(aitk)],
                       check=True)
    install_system_libs()
    install_aitk_deps(aitk)

    # 2. data
    materialize()

    # 3. config
    yaml_path = WORK / "train_config.yaml"
    yaml_path.write_text(YAML_TEMPLATE
                         .replace("__STEPS__", str(args.steps))
                         .replace("__SAVE_EVERY__", str(save_every))
                         .replace("__MAX_SAVES__", str(args.max_saves))
                         .replace("__RES__", str(args.resolution)))
    print(yaml_path.read_text(), flush=True)

    # 4+5. train with a loss tail
    stop = threading.Event()
    t = threading.Thread(target=tail_loss_to_trackio,
                         args=(args.trackio_space, stop, state), daemon=True)
    t.start()
    wall0 = time.time()
    with open("/work/train_stdout.log", "w") as tee:
        proc = subprocess.run([sys.executable, "run.py", str(yaml_path)],
                              cwd=str(aitk), stdout=tee,
                              stderr=subprocess.STDOUT)
    wall_s = time.time() - wall0
    stop.set(); t.join(timeout=30)

    # real step timing comes from the tqdm elapsed clock
    text = Path("/work/train_stdout.log").read_text(errors="ignore")
    found = parse_tqdm(text)
    train_s, s_per_step = None, None
    if found:
        last = found[max(found)]
        train_s, s_per_step = float(last[2]), last[2] / last[0]
    loss_dump = dump_loss_stdout()
    db_dump = dump_loss_db()

    if proc.returncode != 0:
        tail = open("/work/train_stdout.log").read()[-4000:]
        print("TRAIN FAILED\n" + tail, flush=True)
        # ship the stdout log even on failure so the loss curve is not lost
        try:
            upload_artifacts(run_name + "_FAILED",
                             extra_files=[("/work/train_stdout.log", "train_stdout.log")])
        except Exception as e:
            print(f"[upload] failure-log upload skipped: {e}", flush=True)
        raise SystemExit(proc.returncode)

    # 6. ship it
    print(f"DONE wall_seconds={wall_s:.1f} train_seconds={train_s} "
          f"s_per_step={s_per_step} last_step={state['last_step']} "
          f"last_loss={state['last_loss']}", flush=True)
    upload_artifacts(run_name, extra_files=[
        ("/work/train_stdout.log", "train_stdout.log"),
        (loss_dump, "loss_log.jsonl"),
        (db_dump, "loss_db.jsonl"),
    ])
    print("UPLOADED OK", flush=True)


if __name__ == "__main__":
    main()