#!/usr/bin/env bash
# Build .skill archives from skills/<name>/ into dist/<name>.skill
# Usage: build.sh [--prune] [name...]
#   no args        = build all skills/* into dist/<name>.skill
#   --prune        = after build, remove dist/<name>.skill files whose <name>
#                    is NOT in skills/* (analogue of install.sh --prune).
#                    Prune always scans the full dist/, ignores name filter.
#
# Uses `zip` if available; otherwise delegates to scripts/build.ps1
# (so the script works on Linux, macOS, and Windows-with-git-bash without
# requiring `zip` on Windows).
set -euo pipefail

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

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

if command -v zip >/dev/null 2>&1; then
  mkdir -p "$DIST"
  if [ "${#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 name in "${names[@]}"; do
    src_dir="$SRC/$name"
    if [ ! -d "$src_dir" ]; then
      echo "skip: $name (not found in skills/)" >&2
      continue
    fi
    if [ ! -f "$src_dir/SKILL.md" ]; then
      echo "skip: $name (missing SKILL.md)" >&2
      continue
    fi
    out="$DIST/$name.skill"
    rm -f "$out"
    ( cd "$SRC" && zip -qr "$out" "$name" )
    echo "built: dist/$name.skill"
  done
elif command -v powershell.exe >/dev/null 2>&1; then
  # Windows fallback: delegate to build.ps1 (proper ZIP via .NET API).
  # PS array binding via -File is fragile (commas don't always split into [string[]]),
  # so call build.ps1 once per skill and let the bash loop do the work.
  # --prune is NOT forwarded — bash handles prune at the end of this script
  # against the same dist/, regardless of which build path ran.
  ps1="$SCRIPT_DIR/build.ps1"
  ps1_win="$(cygpath -w "$ps1" 2>/dev/null || echo "$ps1")"
  if [ "${#positional[@]}" -eq 0 ]; then
    powershell.exe -NoProfile -ExecutionPolicy Bypass -File "$ps1_win"
  else
    for name in "${positional[@]}"; do
      powershell.exe -NoProfile -ExecutionPolicy Bypass -File "$ps1_win" -Names "$name"
    done
  fi
else
  echo "error: need either 'zip' (Linux/macOS) or PowerShell (Windows) to build .skill archives" >&2
  exit 1
fi

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