#!/usr/bin/env bash
# Install skills/<name>/ into ~/.claude/skills/<name>/ (or $CLAUDE_SKILLS_DIR)
# Usage: install.sh [--prune] [name...]
#   no args        = install all skills/* into target
#   --prune        = after install, remove target/<name>/ dirs that are NOT in skills/*
#                    (prune always scans full target, ignores name filter — global cleanup)
set -euo pipefail

ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
SRC="$ROOT/skills"
TARGET="${CLAUDE_SKILLS_DIR:-$HOME/.claude/skills}"

prune=0
positional=()
for arg in "$@"; do
  case "$arg" in
    --prune) prune=1 ;;
    *) positional+=("$arg") ;;
  esac
done

if [ "${#positional[@]}" -eq 0 ]; then
  # Portable across bash 3.2 (stock macOS) and bash 4+ (Linux, git-bash):
  # avoid `mapfile` (bash 4+) and `find -printf` (GNU find only).
  names=()
  for d in "$SRC"/*/; do
    [ -d "$d" ] || continue
    names+=("$(basename "$d")")
  done
  IFS=$'\n' names=($(printf '%s\n' "${names[@]}" | sort))
  unset IFS
else
  names=("${positional[@]}")
fi

mkdir -p "$TARGET"

for name in "${names[@]}"; do
  src_dir="$SRC/$name"
  dst_dir="$TARGET/$name"
  if [ ! -d "$src_dir" ]; then
    echo "skip: $name (not found in skills/)" >&2
    continue
  fi
  if [ ! -f "$src_dir/SKILL.md" ]; then
    echo "skip: $name (missing SKILL.md)" >&2
    continue
  fi
  rm -rf "$dst_dir"
  cp -R "$src_dir" "$dst_dir"
  echo "installed: $name → $dst_dir"
done

if [ "$prune" -eq 1 ]; then
  for d in "$TARGET"/*/; do
    [ -d "$d" ] || continue
    name="$(basename "$d")"
    if [ ! -d "$SRC/$name" ]; then
      echo "pruning: $name (not in skills/) → $d"
      rm -rf "$d"
    fi
  done
fi