#!/usr/bin/env bash
# =============================================================================
# setup.sh — one-shot environment setup for the SMAL dog dataset render script.
#
# What it does:
#   1. (optional) creates the conda env from ../environment.yml  [--make-env]
#   2. clones the BITE renderer code        github.com/camenduru/bite_gradio-hf @ dev
#   3. clones the BITE/SMAL model weights    huggingface.co/camenduru/bite
#      and moves  data/ checkpoint/ datasets/  into the code checkout, so that
#      bite_gradio-hf/data/smal_data/new_dog_models/my_smpl_39dogsnorm_Jr_4_dog.pkl
#      (the '39dogs_norm' model the renderer needs) is in place.
#   4. patches the cloned BITE code (idempotent) for the renderer:
#        - adds the keyp_conf=='all' branch (47-keypoint output) to smal_torch_new.py
#        - makes torch.cross() pass dim=-1 in geometry_utils.py (future-proof)
#   5. installs chumpy into the env (BITE imports it; it needs --no-build-isolation,
#      so it is not listed in environment.yml).
#
# We do NOT redistribute any model weights — this reproduces the public
# camenduru colab (https://github.com/camenduru/bite-colab) flow. You remain
# bound by the upstream SMAL/MPI license terms (see docs/SMAL_SETUP.md).
#
# Usage:
#   bash scripts/setup.sh [--bite-root DIR] [--env-name NAME] [--make-env]
#
#   --bite-root DIR   where to place the BITE checkout   (default: <repo>/bite_gradio-hf)
#   --env-name NAME   conda env name to create           (default: eccv26_bdoped)
#   --make-env        also create the conda env from ../environment.yml
#
# Requirements: git, git-lfs (for the weights), and conda (only with --make-env).
# =============================================================================
set -euo pipefail

HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"   # repo/scripts
REPO_DIR="$(dirname "$HERE")"                            # repo/
# Default the BITE checkout into the repo itself so the repo is self-contained
# (the renderer resolves <repo>/bite_gradio-hf regardless of the working dir).
BITE_ROOT="$REPO_DIR/bite_gradio-hf"
ENV_NAME="eccv26_bdoped"
MAKE_ENV=0

while [[ $# -gt 0 ]]; do
  case "$1" in
    --bite-root) BITE_ROOT="$2"; shift 2 ;;
    --env-name)  ENV_NAME="$2";  shift 2 ;;
    --make-env)  MAKE_ENV=1;     shift 1 ;;
    -h|--help)   sed -n '2,30p' "$0"; exit 0 ;;
    *) echo "Unknown arg: $1" >&2; exit 2 ;;
  esac
done

echo ">> BITE_ROOT = $BITE_ROOT"
echo ">> ENV_NAME  = $ENV_NAME  (make-env=$MAKE_ENV)"

# --- 0. conda env (optional) -------------------------------------------------
if [[ "$MAKE_ENV" == "1" ]]; then
  echo ">> Creating conda env '$ENV_NAME' from $REPO_DIR/environment.yml"
  conda env create -n "$ENV_NAME" -f "$REPO_DIR/environment.yml"
  echo ">> Done. Activate with:  conda activate $ENV_NAME"
fi

command -v git >/dev/null || { echo "git not found" >&2; exit 1; }
git lfs version >/dev/null 2>&1 || { echo "git-lfs not found (needed for weights)" >&2; exit 1; }

# --- 1. BITE renderer code ---------------------------------------------------
if [[ -d "$BITE_ROOT/src/smal_pytorch" ]]; then
  echo ">> BITE code already present at $BITE_ROOT (skipping clone)"
else
  echo ">> Cloning BITE code -> $BITE_ROOT"
  git clone -b dev https://github.com/camenduru/bite_gradio-hf "$BITE_ROOT"
fi

# --- 2. BITE/SMAL weights ----------------------------------------------------
SMAL_PKL="$BITE_ROOT/data/smal_data/new_dog_models/my_smpl_39dogsnorm_Jr_4_dog.pkl"
if [[ -f "$SMAL_PKL" ]]; then
  echo ">> SMAL weights already in place ($SMAL_PKL) — skipping weights download"
else
  TMP_W="$(mktemp -d)"
  echo ">> Cloning weights huggingface.co/camenduru/bite -> $TMP_W/bite (~2 GB)"
  GIT_LFS_SKIP_SMUDGE=0 git clone https://huggingface.co/camenduru/bite "$TMP_W/bite"
  echo ">> Moving data/ checkpoint/ datasets/ into $BITE_ROOT"
  for d in data checkpoint datasets; do
    if [[ -d "$TMP_W/bite/$d" ]]; then
      mkdir -p "$BITE_ROOT/$d"
      cp -rn "$TMP_W/bite/$d/." "$BITE_ROOT/$d/"
    fi
  done
  rm -rf "$TMP_W"
  [[ -f "$SMAL_PKL" ]] || { echo "ERROR: expected $SMAL_PKL after setup" >&2; exit 1; }
fi

# --- 3. patch BITE code for the renderer (idempotent) ------------------------
echo ">> Patching BITE code for the renderer (idempotent)"
SMAL_PY="$BITE_ROOT/src/smal_pytorch/smal_model/smal_torch_new.py"
GEOM_PY="$BITE_ROOT/src/lifting_to_3d/utils/geometry_utils.py"
python - "$SMAL_PY" "$GEOM_PY" <<'PYEOF'
import sys
smal_py, geom_py = sys.argv[1], sys.argv[2]

# (a) smal_torch_new.py: add the keyp_conf == 'all' branch (returns all 47 joints/keypoints)
s = open(smal_py).read()
if "keyp_conf == 'all'" in s:
    print("   - smal_torch_new.py: 'all' branch already present")
else:
    lines = s.split("\n")
    out, done = [], False
    for i, ln in enumerate(lines):
        # insert just before the first 8-space `else:` that follows the 'dict' branch
        if (not done and ln.startswith("        else:")
                and any("elif keyp_conf == 'dict':" in p for p in lines[:i])):
            out.append("        elif keyp_conf == 'all':")
            out.append("            relevant_joints = joints")
            done = True
        out.append(ln)
    if not done:
        sys.exit("ERROR: could not locate insertion point for keyp_conf=='all' in " + smal_py)
    open(smal_py, "w").write("\n".join(out))
    print("   - smal_torch_new.py: inserted keyp_conf=='all' branch")

# (b) geometry_utils.py: torch.cross(b1, b2) -> torch.cross(b1, b2, dim=-1)
g = open(geom_py).read()
if "torch.cross(b1, b2, dim" in g:
    print("   - geometry_utils.py: torch.cross dim already set")
elif "torch.cross(b1, b2)" in g:
    open(geom_py, "w").write(g.replace("torch.cross(b1, b2)", "torch.cross(b1, b2, dim=-1)"))
    print("   - geometry_utils.py: pinned torch.cross dim=-1")
else:
    print("   - geometry_utils.py: torch.cross(b1, b2) not found (skipped)")
PYEOF

# --- 4. chumpy (required by BITE; needs --no-build-isolation) -----------------
echo ">> Ensuring chumpy is installed (BITE imports it)"
# Target the env's own python explicitly. `conda run -n NAME python` is unreliable
# here (it can resolve a python outside the env), so derive the interpreter path.
ENV_PY="$(conda info --base 2>/dev/null)/envs/$ENV_NAME/bin/python"
if [[ -x "$ENV_PY" ]]; then
  PY="$ENV_PY"                       # named env (created via environment.yml / --make-env)
elif command -v python >/dev/null 2>&1; then
  PY="$(command -v python)"          # fall back to the active python (env already activated)
else
  echo "WARN: no python found to install chumpy; activate the env then re-run." >&2
  PY=""
fi
if [[ -n "$PY" ]]; then
  echo ">> chumpy target python: $PY"
  if "$PY" -m pip show chumpy >/dev/null 2>&1; then
    echo ">> chumpy already installed"
  else
    "$PY" -m pip install -U pip setuptools wheel
    "$PY" -m pip install --no-build-isolation chumpy==0.70
  fi
fi

echo ">> Setup complete. SMAL model: $SMAL_PKL"
echo ">> Render with:  python scripts/render_smal_multiview.py --bite-root $BITE_ROOT ..."