#!/usr/bin/env bash
# Install or update image-to-3dlab on a Mac (Apple Silicon) or Linux (NVIDIA).
#
#   curl -fsSL https://raw.githubusercontent.com/Bingeljell/image-to-3dlab/main/install.sh | bash
#
# Re-running it is how you update: it moves to the newest release and refreshes the
# Python packages. It never downloads model weights. Those are chosen, sized and agreed
# to in the viewer's Setup & Status page.
#
# Options (after `bash -s --` when piping):
#   --dir PATH     where to install (default: ~/image-to-3dlab)
#   --ref REF      a release tag or branch (default: the newest vX.Y.Z release)
#   --repo URL     clone from here instead of GitHub (a fork, or a local copy for testing)
#   --yes          no questions; for scripts and agents
#   --dry-run      say what would happen, change nothing
set -euo pipefail

REPO_URL="https://github.com/Bingeljell/image-to-3dlab.git"
DIR="${HOME}/image-to-3dlab"
REF=""
YES=0
DRY=0

say()  { printf '\033[1;36m[install]\033[0m %s\n' "$*"; }
die()  { printf '\033[1;31m[install]\033[0m %s\n' "$*" >&2; exit 1; }
run()  { if [ "$DRY" = 1 ]; then say "would run: $*"; else "$@"; fi; }

while [ $# -gt 0 ]; do
  case "$1" in
    --dir) DIR="$2"; shift 2 ;;
    --ref) REF="$2"; shift 2 ;;
    --repo) REPO_URL="$2"; shift 2 ;;
    --yes|-y) YES=1; shift ;;
    --dry-run) DRY=1; shift ;;
    -h|--help) sed -n '2,17p' "$0" 2>/dev/null | sed 's/^# \{0,1\}//' \
                 || echo "Options: --dir PATH --ref REF --repo URL --yes --dry-run"; exit 0 ;;
    *) die "unknown option: $1 (try --help)" ;;
  esac
done

# Ask on the terminal, not stdin: under `curl | bash`, stdin is this script.
confirm() {
  [ "$YES" = 1 ] && return 0
  # Opening it is the only honest test: the file exists even with no terminal attached.
  if ! { : < /dev/tty; } 2>/dev/null; then
    die "$1 Nobody to ask here, so stopping. Re-run with --yes to go ahead."
  fi
  printf '%s [y/N] ' "$1" > /dev/tty
  read -r answer < /dev/tty || answer=""
  case "$answer" in y|Y|yes|YES) return 0 ;; *) die "Stopped. Nothing was changed." ;; esac
}

# --- 1. This machine --------------------------------------------------------------------
OS="${I3D_UNAME_S:-$(uname -s)}"      # the I3D_ overrides exist for the test suite
ARCH="${I3D_UNAME_M:-$(uname -m)}"
case "$OS/$ARCH" in
  Darwin/arm64)
    MACHINE="Apple Silicon Mac" ;;
  Linux/x86_64)
    if command -v nvidia-smi >/dev/null 2>&1 && nvidia-smi -L 2>/dev/null | grep -q GPU; then
      MACHINE="Linux with an NVIDIA GPU"
    else
      MACHINE="Linux without an NVIDIA GPU"
      say "No NVIDIA GPU found (nvidia-smi lists none). The viewer will install, but no"
      say "generation route will run here until one is."
    fi ;;
  Darwin/*) die "This Mac has an Intel chip. The lab needs Apple Silicon (M1 or newer)." ;;
  *) die "Unsupported machine: $OS/$ARCH. The lab runs on Apple Silicon Macs and x86-64 Linux with an NVIDIA GPU. On Windows, use install.ps1." ;;
esac
say "Machine: $MACHINE"

# --- 2. Tools ---------------------------------------------------------------------------
if ! command -v git >/dev/null 2>&1; then
  if [ "$OS" = Darwin ]; then die "git is missing. Install it with: xcode-select --install"
  else die "git is missing. Install it with your package manager, e.g. sudo apt install git"
  fi
fi

if ! command -v uv >/dev/null 2>&1 && [ ! -x "$HOME/.local/bin/uv" ]; then
  say "uv (Astral's Python installer, ~40 MB) is needed to set up Python 3.11."
  confirm "Install uv from astral.sh?"
  if [ "$DRY" = 1 ]; then
    say "would run: curl -LsSf https://astral.sh/uv/install.sh | sh"
  else
    curl -LsSf https://astral.sh/uv/install.sh | sh
  fi
fi
UV="$(command -v uv 2>/dev/null || echo "$HOME/.local/bin/uv")"

# --- 3. Code: clone, or update an existing install ---------------------------------------
if [ -d "$DIR/.git" ]; then
  say "Updating the install in $DIR"
  # Tracked edits would be overwritten by a checkout; untracked files (outputs, weights,
  # vendor/) are git-ignored or left alone.
  if [ -n "$(git -C "$DIR" status --porcelain --untracked-files=no)" ]; then
    die "$DIR has local edits to tracked files. Commit or stash them, then run this again."
  fi
  run git -C "$DIR" fetch --tags --force --quiet "$REPO_URL" '+refs/heads/*:refs/remotes/origin/*'
elif [ -e "$DIR" ] && [ -n "$(ls -A "$DIR" 2>/dev/null)" ]; then
  die "$DIR exists and is not an image-to-3dlab install. Pick another place with --dir."
else
  say "Installing into $DIR"
  run git clone --quiet "$REPO_URL" "$DIR"
fi

newest_release() {
  git -C "$DIR" tag --list 'v[0-9]*.[0-9]*.[0-9]*' --sort=-v:refname 2>/dev/null | head -n 1
}
if [ -z "$REF" ]; then
  if [ "$DRY" = 1 ] && [ ! -d "$DIR/.git" ]; then REF="(newest release)"
  else REF="$(newest_release)"; [ -n "$REF" ] || REF="main"
  fi
fi
say "Version: $REF"
if [ "$DRY" = 1 ] && [ ! -d "$DIR/.git" ]; then
  say "would run: git -C $DIR checkout $REF"
elif git -C "$DIR" rev-parse --verify --quiet "refs/remotes/origin/$REF" >/dev/null; then
  run git -C "$DIR" checkout --quiet -B "$REF" "origin/$REF"
else
  run git -C "$DIR" checkout --quiet "$REF"
fi

# --- 4. Python ----------------------------------------------------------------------------
say "Setting up Python 3.11 and the viewer's packages (a few hundred MB, mostly PyTorch)"
run "$UV" venv --quiet --allow-existing --python 3.11 "$DIR/.venv"
run "$UV" pip install --quiet --python "$DIR/.venv/bin/python" -r "$DIR/requirements.txt"

# --- 5. Blender: Finish needs it, and it is the user's to install -----------------------
# Checked with the same finder Finish uses. Missing is a note, not a failure: generating
# models works without it.
if [ "$DRY" != 1 ] && [ -x "$DIR/.venv/bin/python" ] && ! (cd "$DIR" && .venv/bin/python -c \
    'import sys; from image_to_3dlab.blender import find_blender; sys.exit(0 if find_blender() else 1)') \
    2>/dev/null; then
  say "Blender was not found. Finish (the low-poly clean-up) needs Blender 4.2 or newer:"
  say "  https://www.blender.org/download/  (Linux: or sudo snap install blender --classic)"
fi

# --- 6. Done ------------------------------------------------------------------------------
say "Done. Start the lab with:"
printf '\n    cd %s && .venv/bin/python viewer/serve.py\n\n' "$DIR"
say "Then open Setup & Status to choose what to install. Nothing large downloads until you"
say "say so there. To update later, run this installer again, then restart the viewer."