#!/bin/sh
# FaceNinja skill installer 1.0.0 (macOS, Linux, WSL). It copies the skill folder (SKILL.md, scripts/faceninja.py,
# reference/api.md, README.md) into the skills folder of each AI agent it finds and changes nothing else.
#
#   curl -fsSL https://faceninja.net/skill/install.sh | sh                       every agent found here
#   curl -fsSL https://faceninja.net/skill/install.sh | sh -s -- --claude        only Claude Code  (~/.claude/skills)
#        --codex (~/.codex/skills, $CODEX_HOME/skills)   --cursor (./.cursor/skills)   --agents (./.agents/skills)
#        --dir PATH (any skills folder)   --agents-md (also add one line to ./AGENTS.md; otherwise it only asks)
set -eu

BASE="${FACENINJA_API_BASE:-https://faceninja.net}"
BASE="${BASE%/}"
# SHA-256 of each file, written by tools/skill/build.mjs; a download that does not match is refused
SUMS='
e5042de77212ea11a0e93954d4e6733fe828481c270d0570d478792f982f9fdd  SKILL.md
817bb11ae1244a32ff55d8ac10e0f19ab5e33565b7842dec3a0b3fece27a1bbb  README.md
561461d99e29f4251ac76e31cee0f1fcbe7112c829c0481d52fd8505a60e6135  scripts/faceninja.py
5ba682b2b97c4144ccf20d1ed447e96dd5abf3742c47f00642b0ed083d4caba6  reference/api.md
'

targets=''
agents_md=''
add() { case "$targets" in *"|$1|"*) ;; *) targets="$targets|$1|" ;; esac; }
while [ $# -gt 0 ]; do
  case "$1" in
    --claude) add "${CLAUDE_CONFIG_DIR:-$HOME/.claude}/skills" ;;
    --codex) add "${CODEX_HOME:-$HOME/.codex}/skills" ;;
    --cursor) add "$PWD/.cursor/skills" ;;
    --agents) add "$PWD/.agents/skills" ;;
    --dir) shift; add "${1:?--dir needs a folder}" ;;
    --agents-md) agents_md=yes ;;
    -h|--help) sed -n '2,9p' "$0" 2>/dev/null || true; exit 0 ;;
    *) echo "Unknown option: $1" >&2; exit 2 ;;
  esac
  shift
done

if [ -z "$targets" ]; then
  if [ -n "${CLAUDE_CONFIG_DIR:-}" ]; then add "$CLAUDE_CONFIG_DIR/skills"; elif [ -d "$HOME/.claude" ]; then add "$HOME/.claude/skills"; fi
  if [ -n "${CODEX_HOME:-}" ]; then add "$CODEX_HOME/skills"; fi
  if [ -d "$HOME/.codex" ]; then add "$HOME/.codex/skills"; fi
  if [ -d "$PWD/.cursor" ]; then add "$PWD/.cursor/skills"; fi
  if [ -d "$PWD/.agents" ] || [ -z "$targets" ]; then add "$PWD/.agents/skills"; fi
fi

if command -v sha256sum >/dev/null 2>&1; then sha() { sha256sum "$1" | cut -d' ' -f1; }
elif command -v shasum >/dev/null 2>&1; then sha() { shasum -a 256 "$1" | cut -d' ' -f1; }
else sha() { echo unchecked; }; echo "Note: no sha256sum or shasum here; the downloads are not checked." >&2; fi

tmp=$(mktemp -d)
trap 'rm -rf "$tmp"' EXIT
mkdir -p "$tmp/scripts" "$tmp/reference"
echo "$SUMS" | while read -r want file; do
  [ -n "$file" ] || continue
  curl -fsSL "$BASE/skill/$file" -o "$tmp/$file"
  got=$(sha "$tmp/$file")
  if [ "$got" != unchecked ] && [ "$got" != "$want" ]; then echo "Checksum mismatch for $file; nothing was installed." >&2; exit 1; fi
done
chmod 755 "$tmp/scripts/faceninja.py"

echo "Installed the FaceNinja skill 1.0.0 to:"
printf '%s' "$targets" | tr '|' '\n' | while read -r dir; do
  [ -n "$dir" ] || continue
  mkdir -p "$dir/faceninja/scripts" "$dir/faceninja/reference"
  for file in SKILL.md README.md scripts/faceninja.py reference/api.md; do cp "$tmp/$file" "$dir/faceninja/$file"; done
  echo "  $dir/faceninja"
done

case "$targets" in *"|$PWD/.agents/skills|"*)
  line='- FaceNinja (photos to MetaHuman heads): read .agents/skills/faceninja/SKILL.md'
  if [ -f AGENTS.md ] && grep -qF '.agents/skills/faceninja/SKILL.md' AGENTS.md; then :
  else
    if [ -z "$agents_md" ] && [ -t 1 ] && [ -r /dev/tty ]; then
      printf 'Add a line to ./AGENTS.md so agents find the skill? [y/N] '
      read -r answer </dev/tty || answer=''
      case "$answer" in y|Y|yes) agents_md=yes ;; esac
    fi
    if [ -n "$agents_md" ]; then printf '\n%s\n' "$line" >> AGENTS.md; echo "Added a line to ./AGENTS.md."
    else echo "Agents that read AGENTS.md find the skill if you add this line there (or rerun with --agents-md):"; echo "  $line"; fi
  fi ;;
esac

py=$(command -v python3 || command -v python || true)
[ -n "$py" ] || echo "Note: the skill needs Python 3.9 or newer, which was not found." >&2
echo "Next: ask your agent to use the FaceNinja skill, or run: ${py:-python3} <folder above>/scripts/faceninja.py login"