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

ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
INSTALL_DIR="${INSTALL_DIR:-$ROOT_DIR/.local/dcmtk-bin}"
REQUIRED_BINS=(storescp movescu storescu findscu dcmdump dcmodify getscu echoscu dcmj2pnm)

usage() {
  cat <<'EOF'
Usage:
  scripts/setup-dcmtk.sh [--source-dir DIR] [--install-dir DIR]

Behavior:
  - Copies required DCMTK binaries into a local ignored directory.
  - If --source-dir is omitted, binaries are resolved from PATH.

Examples:
  scripts/setup-dcmtk.sh --source-dir /opt/dcmtk/bin
  scripts/setup-dcmtk.sh --install-dir /data/dcmtk-bin
EOF
}

SOURCE_DIR=""
while [[ $# -gt 0 ]]; do
  case "$1" in
    --source-dir)
      SOURCE_DIR="${2:?missing value for --source-dir}"
      shift 2
      ;;
    --install-dir)
      INSTALL_DIR="${2:?missing value for --install-dir}"
      shift 2
      ;;
    -h|--help)
      usage
      exit 0
      ;;
    *)
      echo "Unknown argument: $1" >&2
      usage >&2
      exit 1
      ;;
  esac
done

mkdir -p "$INSTALL_DIR"

resolve_bin() {
  local name="$1"
  if [[ -n "$SOURCE_DIR" ]]; then
    local candidate="$SOURCE_DIR/$name"
    [[ -x "$candidate" ]] || { echo "missing executable: $candidate" >&2; return 1; }
    printf '%s\n' "$candidate"
    return 0
  fi

  command -v "$name" >/dev/null 2>&1 || { echo "binary not found in PATH: $name" >&2; return 1; }
  command -v "$name"
}

for bin in "${REQUIRED_BINS[@]}"; do
  src="$(resolve_bin "$bin")"
  install -m 0755 "$src" "$INSTALL_DIR/$bin"
  echo "installed $bin -> $INSTALL_DIR/$bin"
done

cat <<EOF

Done.
Set these config values:

dcmtk:
  storescp: "$INSTALL_DIR/storescp"
  movescu:  "$INSTALL_DIR/movescu"
  storescu: "$INSTALL_DIR/storescu"
EOF