#!/usr/bin/env bash
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
REPO_ROOT="$(cd "${SCRIPT_DIR}/../.." && pwd)"
cd "${REPO_ROOT}"

export HF_ENABLE_PARALLEL_LOADING="${HF_ENABLE_PARALLEL_LOADING:-yes}"
export HF_PARALLEL_LOADING_WORKERS="${HF_PARALLEL_LOADING_WORKERS:-8}"
export PYTHONPATH="${REPO_ROOT}:${PYTHONPATH:-}"

BASE_MODEL_PATH="${BASE_MODEL_PATH:-${REPO_ROOT}/checkpoints/Helios-Base}"
TRANSFORMER_PATH="${TRANSFORMER_PATH:-${BASE_MODEL_PATH}}"
OUTPUT_ROOT="${OUTPUT_ROOT:-${REPO_ROOT}/output_helios/token_dynamics_debug}"
DEBUG_DIR="${DEBUG_DIR:-${OUTPUT_ROOT}/artifacts}"
HEIGHT="${HEIGHT:-384}"
WIDTH="${WIDTH:-640}"
NUM_FRAMES="${NUM_FRAMES:-66}"
FPS="${FPS:-24}"
NUM_INFERENCE_STEPS="${NUM_INFERENCE_STEPS:-50}"
GUIDANCE_SCALE="${GUIDANCE_SCALE:-5.0}"
SEED="${SEED:-0}"
WEIGHT_DTYPE="${WEIGHT_DTYPE:-bf16}"

CHUNKS="${CHUNKS:-1}"
HISTORY_FRAME="${HISTORY_FRAME:--1}"
NOISE_FRAME="${NOISE_FRAME:-0}"
VIS_STRIDE="${VIS_STRIDE:-16}"
VIS_MAX_PAIRS="${VIS_MAX_PAIRS:-32}"
CLEAN_DEBUG_DIR="${CLEAN_DEBUG_DIR:-1}"

PROMPT="${PROMPT:-A cinematic close-up of a red sports car driving through a rainy city street at night. Reflections of neon signs ripple across the wet road while the camera follows the car smoothly from the front. The scene has realistic motion, detailed reflections, and a shallow depth of field.}"
NEGATIVE_PROMPT="${NEGATIVE_PROMPT:-Bright tones, overexposed, static, blurred details, subtitles, style, works, paintings, images, static, overall gray, worst quality, low quality, JPEG compression residue, ugly, incomplete, extra fingers, poorly drawn hands, poorly drawn faces, deformed, disfigured, misshapen limbs, fused fingers, still picture, messy background, three legs, many people in the background, walking backwards}"

export BASE_MODEL_PATH TRANSFORMER_PATH OUTPUT_ROOT DEBUG_DIR
export HEIGHT WIDTH NUM_FRAMES FPS NUM_INFERENCE_STEPS GUIDANCE_SCALE SEED WEIGHT_DTYPE
export CHUNKS HISTORY_FRAME NOISE_FRAME VIS_STRIDE VIS_MAX_PAIRS PROMPT NEGATIVE_PROMPT

mkdir -p "${OUTPUT_ROOT}" "${DEBUG_DIR}"
if [[ "${CLEAN_DEBUG_DIR}" == "1" ]]; then
  find "${DEBUG_DIR}" -maxdepth 1 -type f \( -name 'token_dynamics_*.pt' -o -name 'token_dynamics_*.png' -o -name '*_match_*.png' \) -delete
fi

echo "Running Helios token-dynamics debug"
echo "  repo: ${REPO_ROOT}"
echo "  model: ${BASE_MODEL_PATH}"
echo "  output: ${OUTPUT_ROOT}"
echo "  artifacts: ${DEBUG_DIR}"
echo "  chunks=${CHUNKS} history_frame=${HISTORY_FRAME} noise_frame=${NOISE_FRAME}"

python - <<'PY'
import os
import time
from pathlib import Path

import torch
from diffusers.models import AutoencoderKLWan
from diffusers.utils import export_to_video

from helios.diffusers_version.pipeline_helios_diffusers import HeliosPipeline
from helios.diffusers_version.scheduling_helios_diffusers import HeliosScheduler
from helios.diffusers_version.transformer_helios_diffusers import HeliosTransformer3DModel
from helios.modules.helios_kernels import (
    replace_all_norms_with_flash_norms,
    replace_rmsnorm_with_fp32,
    replace_rope_with_flash_rope,
)


def parse_csv_ints(value):
    return [int(x.strip()) for x in str(value).split(",") if x.strip()]


def parse_dtype(value):
    if value == "fp32":
        return torch.float32
    if value == "fp16":
        return torch.float16
    return torch.bfloat16


base_model_path = os.environ["BASE_MODEL_PATH"]
transformer_path = os.environ["TRANSFORMER_PATH"]
output_root = Path(os.environ["OUTPUT_ROOT"])
debug_dir = Path(os.environ["DEBUG_DIR"])
height = int(os.environ["HEIGHT"])
width = int(os.environ["WIDTH"])
num_frames = int(os.environ["NUM_FRAMES"])
fps = int(os.environ["FPS"])
num_inference_steps = int(os.environ["NUM_INFERENCE_STEPS"])
guidance_scale = float(os.environ["GUIDANCE_SCALE"])
seed = int(os.environ["SEED"])
weight_dtype = parse_dtype(os.environ["WEIGHT_DTYPE"])

token_dynamics_debug = {
    "output_dir": str(debug_dir),
    "chunks": parse_csv_ints(os.environ["CHUNKS"]),
    "history_frame": int(os.environ["HISTORY_FRAME"]),
    "noise_frame": int(os.environ["NOISE_FRAME"]),
    "pass_names": ["cond"],
    "overwrite": True,
}

device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
if device.type != "cuda":
    raise RuntimeError("This script expects a CUDA device for Helios inference.")

transformer = HeliosTransformer3DModel.from_pretrained(
    transformer_path,
    subfolder="transformer",
    torch_dtype=weight_dtype,
)
transformer = replace_rmsnorm_with_fp32(transformer)
transformer = replace_all_norms_with_flash_norms(transformer)
replace_rope_with_flash_rope()

cuda_major = torch.cuda.get_device_capability()[0]
if cuda_major >= 9:
    try:
        transformer.set_attention_backend("_flash_3_hub")
    except Exception:
        transformer.set_attention_backend("flash_hub")
else:
    transformer.set_attention_backend("flash_hub")

vae = AutoencoderKLWan.from_pretrained(
    base_model_path,
    subfolder="vae",
    torch_dtype=torch.float32,
)
scheduler = HeliosScheduler.from_pretrained(
    base_model_path,
    subfolder="scheduler",
)
pipe = HeliosPipeline.from_pretrained(
    base_model_path,
    transformer=transformer,
    vae=vae,
    scheduler=scheduler,
    torch_dtype=weight_dtype,
)
pipe = pipe.to(device)

start = time.time()
pipe_output = pipe(
    prompt=os.environ["PROMPT"],
    negative_prompt=os.environ["NEGATIVE_PROMPT"],
    height=height,
    width=width,
    num_frames=num_frames,
    num_inference_steps=num_inference_steps,
    guidance_scale=guidance_scale,
    generator=torch.Generator(device=device).manual_seed(seed),
    history_sizes=[16, 2, 1],
    num_latent_frames_per_chunk=9,
    keep_first_frame=True,
    is_enable_stage2=False,
    use_zero_init=False,
    zero_steps=1,
    token_dynamics_debug=token_dynamics_debug,
)
elapsed = time.time() - start

video = pipe_output.frames[0]
video_path = output_root / "token_dynamics_debug_video.mp4"
export_to_video(video, str(video_path), fps=fps)

print(f"Saved video: {video_path}")
print(f"Saved artifacts in: {debug_dir}")
print(f"Elapsed: {elapsed:.1f}s")
print(f"Max CUDA memory: {torch.cuda.max_memory_allocated() / 1024**3:.3f} GB")
PY

mapfile -t ARTIFACTS < <(find "${DEBUG_DIR}" -maxdepth 1 -type f -name 'token_dynamics_*.pt' | sort)
if [[ "${#ARTIFACTS[@]}" -eq 0 ]]; then
  echo "No token dynamics artifacts were written. Check CHUNKS and NUM_FRAMES." >&2
  exit 1
fi

echo "Visualizing ${#ARTIFACTS[@]} artifact(s)"
for artifact in "${ARTIFACTS[@]}"; do
  python tools/visualize_token_dynamics.py \
    "${artifact}" \
    --output-dir "${DEBUG_DIR}" \
    --stride "${VIS_STRIDE}" \
    --max-pairs "${VIS_MAX_PAIRS}"
  python tools/visualize_token_match_frames.py \
    "${artifact}" \
    --model-path "${BASE_MODEL_PATH}" \
    --output-dir "${DEBUG_DIR}"
done

echo "Done."
echo "Video: ${OUTPUT_ROOT}/token_dynamics_debug_video.mp4"
echo "Artifacts and PNGs: ${DEBUG_DIR}"