#!/usr/bin/env sh
set -eu

# Install Codex skills from this Playbook snapshot into CODEX_HOME.
# - Source: <snapshot>/codex/skills/<skill-name>/
# - Dest:   $CODEX_HOME/skills/<skill-name>/  (default CODEX_HOME=~/.codex)
#
# Usage:
#   sh scripts/install_codex_skills.sh            # install all skills
#   sh scripts/install_codex_skills.sh style-cleanup code-review-workflow
#
# Notes:
# - Codex loads skills at startup; restart `codex` after installation.
# - Existing destination skill dirs are backed up with a timestamp suffix.

SCRIPT_DIR="$(CDPATH= cd -- "$(dirname -- "$0")" && pwd -P)"
SRC="$(CDPATH= cd -- "$SCRIPT_DIR/.." && pwd -P)"
SKILLS_SRC_ROOT="$SRC/codex/skills"

CODEX_HOME="${CODEX_HOME:-$HOME/.codex}"
SKILLS_DST_ROOT="$CODEX_HOME/skills"

if [ ! -d "$SKILLS_SRC_ROOT" ]; then
  echo "ERROR: skills source dir not found: $SKILLS_SRC_ROOT" >&2
  exit 1
fi

mkdir -p "$SKILLS_DST_ROOT"
timestamp="$(date +%Y%m%d%H%M%S 2>/dev/null || echo bak)"

install_one() {
  name="$1"
  src_dir="$SKILLS_SRC_ROOT/$name"
  dst_dir="$SKILLS_DST_ROOT/$name"

  if [ ! -d "$src_dir" ]; then
    echo "ERROR: skill not found: $name ($src_dir)" >&2
    exit 1
  fi
  if [ -e "$dst_dir" ]; then
    mv "$dst_dir" "$SKILLS_DST_ROOT/$name.bak.$timestamp"
    echo "Backed up existing skill: $name -> $name.bak.$timestamp"
  fi
  cp -R "$src_dir" "$dst_dir"
  echo "Installed: $name"
}

if [ "$#" -gt 0 ]; then
  for name in "$@"; do
    install_one "$name"
  done
else
  for dir in "$SKILLS_SRC_ROOT"/*; do
    [ -d "$dir" ] || continue
    name="$(basename -- "$dir")"
    case "$name" in
      ""|.*) continue ;;
    esac
    install_one "$name"
  done
fi

echo "Done. Skills installed to: $SKILLS_DST_ROOT"