#!/usr/bin/env bash
# Bootstrap for installing scripts from Klick3R-1/.bin (root-level files)
# Usage:
#   curl -fsSL https://scripts.klick3r.com | bash
#   curl -fsSL https://scripts.klick3r.com | bash -s -- list
#   curl -fsSL https://scripts.klick3r.com | bash -s -- NAME
#   BRANCH=master curl -fsSL https://scripts.klick3r.com | bash -s -- list
set -Eeuo pipefail

# If we're piped (curl | bash), restore stdin to TTY so `read` works.
if [ ! -t 0 ] && [ -r /dev/tty ]; then exec </dev/tty; fi

# ===== CONFIG =====
REPO_USER="Klick3R-1"
REPO_NAME=".bin"
BRANCH="${BRANCH:-main}"      # default branch (tries main→master automatically)
UA="klick3r-bootstrap/1.1"
CURL_OPTS=( -fsSL --retry 1 --connect-timeout 5 --max-time 12 -H "User-Agent: ${UA}" )
API_ACCEPT=( -H "Accept: application/vnd.github+json" )
SKIP_REGEX='^(\.gitignore|\.gitattributes|README(\.md)?|LICENSE(\.md)?|_headers|_redirects)$'

have()  { command -v "$1" >/dev/null 2>&1; }
abort() { echo "Error: $*" >&2; exit 1; }

curl_api() {
  if [ -n "${GH_TOKEN:-}" ]; then
    curl "${CURL_OPTS[@]}" "${API_ACCEPT[@]}" -H "Authorization: Bearer ${GH_TOKEN}" "$@"
  else
    curl "${CURL_OPTS[@]}" "${API_ACCEPT[@]}" "$@"
  fi
}

curl_file() {
  if [ -n "${GH_TOKEN:-}" ]; then
    curl "${CURL_OPTS[@]}" -H "Authorization: Bearer ${GH_TOKEN}" "$@"
  else
    curl "${CURL_OPTS[@]}" "$@"
  fi
}

download_to() {
  local url="$1" dest="$2"
  curl_file "$url" -o "$dest"
}

_branch_candidates() { printf '%s\n' "$BRANCH" "main" "master" | awk '!seen[$0]++'; }

# Fast + dependency-free: GitHub Trees API (root only)
fetch_root_files() {
  local b resp names
  for b in $(_branch_candidates); do
    resp="$(curl_api "https://api.github.com/repos/${REPO_USER}/${REPO_NAME}/git/trees/${b}" 2>/dev/null || true)"
    # Basic sanity: must contain a "tree" array
    if ! printf '%s' "$resp" | grep -q '"tree"'; then continue; fi

    # Split objects and print path for type=blob
    names="$(
      printf '%s' "$resp" \
      | tr -d '\n' | sed 's/},{/}\n{/g' \
      | awk -F'"' '/"type":"blob"/ { for (i=1;i<=NF;i++) if ($i=="path") { print $(i+2) } }' \
      | grep -Ev "$SKIP_REGEX" \
      | grep -v '/' \
      | sort -u
    )"

    if [ -n "$names" ]; then
      __EFFECTIVE_BRANCH="$b"
      printf '%s\n' "$names"
      return 0
    fi
  done
  abort "Could not list files from ${REPO_USER}/${REPO_NAME} (branches tried: $(_branch_candidates | paste -sd, -))."
}

effective_branch() { echo "${__EFFECTIVE_BRANCH:-$BRANCH}"; }

raw_url_for() {
  local name="$1" b; b="$(effective_branch)"
  echo "https://raw.githubusercontent.com/${REPO_USER}/${REPO_NAME}/${b}/${name}"
}

ensure_path() {
  if ! echo ":$PATH:" | grep -q ":$HOME/.bin:"; then
    echo "ℹ️  ~/.bin is not in PATH. Add to your shell rc:"
    echo '   export PATH="$HOME/.bin:$PATH"'
    echo
  fi
}

select_file() {
  mapfile -t FILES < <(fetch_root_files)
  ((${#FILES[@]})) || abort "No files found in repo root."

  echo "Available scripts (${#FILES[@]}):"
  for ((i=0;i<${#FILES[@]};i++)); do printf " %2d) %s\n" "$((i+1))" "${FILES[$i]}"; done
  echo

  while true; do
    read -rp "Enter number [1]: " choice || true
    [[ -z "${choice:-}" ]] && choice=1
    if [[ "$choice" =~ ^[0-9]+$ ]] && (( choice>=1 && choice<=${#FILES[@]} )); then
      echo "${FILES[choice-1]}"
      return 0
    fi
    echo "Invalid choice. Try again."
  done
}

install_file() {
  local name="$1"
  mkdir -p "$HOME/.bin"
  download_to "$(raw_url_for "$name")" "$HOME/.bin/${name}"
  chmod +x "$HOME/.bin/${name}"
  echo "✅ Installed: $HOME/.bin/${name}"
}

maybe_run() {
  local name="$1"
  read -rp "Run '${name}' now? [y/N]: " ans || true
  case "${ans:-}" in y|Y) exec "$HOME/.bin/${name}";; *) echo "Done. Run later with: ${name}";; esac
}

usage() {
  cat <<'EOF'
Usage:
  curl -fsSL https://scripts.klick3r.com | bash               # interactive picker
  curl -fsSL https://scripts.klick3r.com | bash -s -- list    # list available (repo root)
  curl -fsSL https://scripts.klick3r.com | bash -s -- NAME    # install NAME directly
Env:
  BRANCH=...    # override branch (default: main; tries main→master automatically)
  GH_TOKEN=...  # optional to lift GitHub API rate limits
EOF
}

main() {
  ensure_path
  case "${1:-}" in
    "" )
      name="$(select_file)"; install_file "$name"; maybe_run "$name"
      ;;
    list )
      fetch_root_files
      ;;
    -h|--help|help )
      usage
      ;;
    * )
      # Verify existence before install
      if fetch_root_files | grep -Fxq -- "$1"; then
        install_file "$1"; maybe_run "$1"
      else
        echo "Unknown script: $1"
        echo; usage
        echo "Available:"; fetch_root_files
        exit 1
      fi
      ;;
  esac
}
main "$@"