#!/usr/bin/env bash
# Install skills/<name>/ into BOTH agent skill dirs:
#   ~/.claude/skills/<name>/  (Claude Code — native, not configurable)
#   ~/.agents/skills/<name>/  (pi — native default scan path, agent-neutral namespace)
# $CLAUDE_SKILLS_DIR overrides ONLY the claude target (for testing/CI).
#
# Usage: install.sh [--prune] [--yes] [name...]
#   no args        = install all skills/* into both targets
#   --prune        = after install, remove target/<name>/ dirs that are NOT in skills/*
#                    (prune always scans full target, ignores name filter — global cleanup)
#   --yes          = with --prune: remove prod-only skills without asking (still warns loudly).
#                    Without --yes, prune asks per skill (default No) and NEVER removes silently:
#                    a prod skill with no source in skills/ is potentially lost knowledge.
set -euo pipefail

ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
SRC="$ROOT/skills"

# Dual install targets — the "canon" is the git repo (skills/); both dirs are installs.
TARGETS=("${CLAUDE_SKILLS_DIR:-$HOME/.claude/skills}" "$HOME/.agents/skills")

prune=0
yes=0
positional=()
for arg in "$@"; do
  case "$arg" in
    --prune) prune=1 ;;
    --yes) yes=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

for target in "${TARGETS[@]}"; do
  mkdir -p "$target"
done

for target in "${TARGETS[@]}"; do
  for name in "${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
done

if [ "$prune" -eq 1 ]; then
  interactive=1
  if [ ! -t 0 ]; then interactive=0; fi
  for target in "${TARGETS[@]}"; do
    for d in "$target"/*/; do
      [ -d "$d" ] || continue
      name="$(basename "$d")"
      if [ ! -d "$SRC/$name" ]; then
        if [ "$yes" -eq 1 ]; then
          echo "WARN: prune: $name (not in skills/) — REMOVED from $d" >&2
          rm -rf "$d"
        elif [ "$interactive" -eq 1 ]; then
          echo "WARN: prune: $name is in prod but has NO source in skills/ — possibly lost knowledge." >&2
          printf '  Remove "%s"? [y/N] ' "$name"
          read -r ans
          if [ "$ans" = "y" ] || [ "$ans" = "Y" ]; then
            rm -rf "$d"
            echo "removed: $name"
          else
            echo "kept: $name (remove manually, or add it to skills/)"
          fi
        else
          echo "WARN: prune skipped: $name (prod skill without source; non-interactive — nothing removed)" >&2
        fi
      fi
    done
  done
fi