import argparse
import json
import os
import subprocess
import sys
from pathlib import Path

ROOT = Path(__file__).resolve().parents[3]
VENDOR = ROOT / "vendor" / "trellis-mac"

ap = argparse.ArgumentParser()
ap.add_argument("--input", action="append", default=[])
ap.add_argument("--outdir", required=True)
ap.add_argument("--params", default="{}")
a = ap.parse_args()
p = json.loads(a.params)

if not a.input:
    print("ERROR: no input image")
    sys.exit(1)
if not (VENDOR / "generate.py").exists():
    print(f"ERROR: trellis-mac not installed at {VENDOR}. Run scripts/install_trellis_mac.sh")
    sys.exit(1)
# manifest no longer pins "python" (broke remote dispatch when the venv path
# didn't exist on the worker) — resolve the vendor venv here instead.
VENV_PY = VENDOR / ".venv" / "bin" / "python"
if not VENV_PY.exists():
    print(f"ERROR: no venv at {VENV_PY} — run scripts/install_trellis_mac.sh")
    sys.exit(1)

outdir = Path(a.outdir)
out_stem = outdir / f"trellis2_{Path(a.input[0]).stem}"

cmd = [
    str(VENV_PY), "generate.py", str(Path(a.input[0]).resolve()),
    "--pipeline-type", str(p.get("pipeline_type", "1024")),
    "--texture-size", str(p.get("texture_size", 2048)),
    "--seed", str(p.get("seed", 0)),
    "--output", str(out_stem.resolve()),
]
if p.get("no_texture"):
    cmd.append("--no-texture")
if p.get("steps"):
    cmd += ["--steps", str(p["steps"])]

env = os.environ.copy()
# xet chunked downloader fails on these BFL/Meta repos ("Unable to parse string
# as hex hash value") — force the reliable HTTP path (same fix as flux_local).
env["HF_HUB_DISABLE_XET"] = "1"
# guard the torch + compiled-kernel OpenMP collision like sf3d does.
env["KMP_DUPLICATE_LIB_OK"] = "TRUE"
env.setdefault("OMP_NUM_THREADS", "1")
env.setdefault("MKL_NUM_THREADS", "1")
# Pre-bake simplify cap. The 200k generate.py default is a laptop-derived
# mtlbvh guard that costs most of the mesh detail (2.2M-tri decode → 95k GLB
# vs fal's 495k). 500k verified crash-free on the M3 Ultra Studio 2026-07-22.
# The server passes only client-sent params (manifest defaults are UI-only),
# so default here, sized by node RAM: big-memory Studios get the quality cap.
if p.get("max_bake_faces") is not None:
    env["TRELLIS2_MAX_BAKE_FACES"] = str(p["max_bake_faces"])
else:
    mem_gb = os.sysconf("SC_PAGE_SIZE") * os.sysconf("SC_PHYS_PAGES") / 1e9
    env.setdefault("TRELLIS2_MAX_BAKE_FACES", "500000" if mem_gb >= 96 else "200000")
if p.get("baker"):
    env["TRELLIS2_BAKER"] = str(p["baker"])
# "auto" keeps o_voxel's baked-alpha BLEND detection (glass etc.); default
# opaque — the Metal baker's noisy alpha turns solid hair into speckles.
if p.get("alpha_mode"):
    env["TRELLIS2_ALPHA_MODE"] = str(p["alpha_mode"])

print("+", " ".join(cmd), flush=True)
print("(first run downloads TRELLIS.2-4B + dinov3 + RMBG-2.0 weights)", flush=True)
res = subprocess.run(cmd, cwd=str(VENDOR), stdout=sys.stdout, stderr=subprocess.STDOUT, env=env)
if res.returncode != 0:
    sys.exit(res.returncode)

# generate.py writes <output>.glb (and often a .obj); collect any glb under outdir
glbs = sorted(outdir.rglob("*.glb"))
if not glbs:
    print("ERROR: trellis-mac produced no .glb")
    sys.exit(1)
outputs = [{"path": str(glbs[0]), "name": f"trellis2_{Path(a.input[0]).stem}.glb",
            "meta": {"tool": "trellis_mac"}}]
(outdir / "result.json").write_text(json.dumps({"outputs": outputs}))
print("done:", glbs[0], flush=True)