#!/usr/bin/env bash
set -euo pipefail

repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
skills_dir="${CODEX_SKILLS_DIR:-$HOME/.codex/skills}"
dry_run=0

usage() {
  printf 'Usage: %s [--dry-run]\n' "$(basename "$0")"
  printf 'Create symlinks for this repo'\''s skill directories in %s.\n' "$skills_dir"
}

case "${1:-}" in
  "")
    ;;
  --dry-run|-n)
    dry_run=1
    ;;
  --help|-h)
    usage
    exit 0
    ;;
  *)
    usage >&2
    exit 2
    ;;
esac

run() {
  if (( dry_run )); then
    printf 'DRY RUN:'
    printf ' %q' "$@"
    printf '\n'
  else
    "$@"
  fi
}

if (( dry_run )); then
  printf 'DRY RUN: mkdir -p %q\n' "$skills_dir"
else
  mkdir -p "$skills_dir"
fi

found=0

while IFS= read -r -d '' skill_file; do
  found=1
  skill_path="$(dirname "$skill_file")"
  skill_name="$(basename "$skill_path")"
  link_path="$skills_dir/$skill_name"

  if [[ -L "$link_path" ]]; then
    current_target="$(readlink "$link_path")"
    if [[ "$current_target" == "$skill_path" ]]; then
      printf 'Already linked: %s -> %s\n' "$link_path" "$skill_path"
    else
      printf 'Skipping existing symlink: %s -> %s\n' "$link_path" "$current_target"
    fi
    continue
  fi

  if [[ -e "$link_path" ]]; then
    printf 'Skipping existing path: %s\n' "$link_path"
    continue
  fi

  run ln -s "$skill_path" "$link_path"
  if (( dry_run )); then
    printf 'Would link: %s -> %s\n' "$link_path" "$skill_path"
  else
    printf 'Linked: %s -> %s\n' "$link_path" "$skill_path"
  fi
done < <(find "$repo_root" -mindepth 2 -maxdepth 2 -name SKILL.md -print0 | sort -z)

if (( ! found )); then
  printf 'No skill directories found under %s\n' "$repo_root" >&2
  exit 1
fi