#!/usr/bin/env bash
# =============================================================================
#  install-cli-apps.sh
#  Detects the system package manager, then installs each app in APPS[].
#  Reports whether each app was already installed or freshly installed.
# =============================================================================

set -euo pipefail

# -----------------------------------------------------------------------------
# 🔧  CONFIGURATION — edit this list to suit your needs
# -----------------------------------------------------------------------------
APPS=(
  git
  curl
  wget
  htop
  tree
  jq
  unzip
  ripgrep
  fzf
  bat
  neofetch
  tmux
  vim
)

# -----------------------------------------------------------------------------
# Colour helpers
# -----------------------------------------------------------------------------
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
CYAN='\033[0;36m'
BOLD='\033[1m'
RESET='\033[0m'

info()    { echo -e "${CYAN}${BOLD}[INFO]${RESET}  $*"; }
success() { echo -e "${GREEN}${BOLD}[OK]${RESET}    $*"; }
warn()    { echo -e "${YELLOW}${BOLD}[SKIP]${RESET}  $*"; }
error()   { echo -e "${RED}${BOLD}[ERROR]${RESET} $*" >&2; }

# -----------------------------------------------------------------------------
# Detect package manager
# -----------------------------------------------------------------------------
detect_package_manager() {
  if   command -v apt-get &>/dev/null; then PM="apt-get";   INSTALL_CMD="apt-get install -y"
  elif command -v apt     &>/dev/null; then PM="apt";       INSTALL_CMD="apt install -y"
  elif command -v dnf     &>/dev/null; then PM="dnf";       INSTALL_CMD="dnf install -y"
  elif command -v yum     &>/dev/null; then PM="yum";       INSTALL_CMD="yum install -y"
  elif command -v pacman  &>/dev/null; then PM="pacman";    INSTALL_CMD="pacman -S --noconfirm"
  elif command -v zypper  &>/dev/null; then PM="zypper";    INSTALL_CMD="zypper install -y"
  elif command -v brew    &>/dev/null; then PM="brew";      INSTALL_CMD="brew install"
  elif command -v apk     &>/dev/null; then PM="apk";       INSTALL_CMD="apk add"
  elif command -v xbps-install &>/dev/null; then PM="xbps"; INSTALL_CMD="xbps-install -y"
  elif command -v emerge  &>/dev/null; then PM="emerge";    INSTALL_CMD="emerge"
  else
    error "No supported package manager found. Aborting."
    exit 1
  fi
}

# -----------------------------------------------------------------------------
# Check if a binary is already available on PATH
# -----------------------------------------------------------------------------
is_installed() {
  command -v "$1" &>/dev/null
}

# -----------------------------------------------------------------------------
# Privilege escalation — skip sudo for root or brew
# -----------------------------------------------------------------------------
maybe_sudo() {
  if [[ "$PM" == "brew" ]] || [[ "$(id -u)" -eq 0 ]]; then
    "$@"
  else
    sudo "$@"
  fi
}

# -----------------------------------------------------------------------------
# Update package index (once, where applicable)
# -----------------------------------------------------------------------------
update_index() {
  case "$PM" in
    apt-get|apt)
      info "Updating package index (apt)…"
      maybe_sudo apt-get update -qq
      ;;
    dnf|yum)
      info "Refreshing metadata (${PM})…"
      maybe_sudo "$PM" makecache -q
      ;;
    pacman)
      info "Syncing package database (pacman)…"
      maybe_sudo pacman -Sy --noconfirm
      ;;
    zypper)
      info "Refreshing repos (zypper)…"
      maybe_sudo zypper refresh -q
      ;;
    apk)
      info "Updating index (apk)…"
      maybe_sudo apk update -q
      ;;
    brew)
      info "Running brew update…"
      brew update --quiet
      ;;
    *)
      : # xbps, emerge — no pre-update needed here
      ;;
  esac
}

# -----------------------------------------------------------------------------
# Install a single package
# -----------------------------------------------------------------------------
install_package() {
  local pkg="$1"
  # shellcheck disable=SC2086
  maybe_sudo $INSTALL_CMD "$pkg"
}

# -----------------------------------------------------------------------------
# Main
# -----------------------------------------------------------------------------
main() {
  echo ""
  echo -e "${BOLD}======================================${RESET}"
  echo -e "${BOLD}   CLI App Installer                  ${RESET}"
  echo -e "${BOLD}======================================${RESET}"
  echo ""

  detect_package_manager
  info "Detected package manager: ${BOLD}${PM}${RESET}"
  echo ""

  update_index
  echo ""

  local already_installed=()
  local newly_installed=()
  local failed=()

  for app in "${APPS[@]}"; do
    if is_installed "$app"; then
      warn "${app} is already installed — skipping."
      already_installed+=("$app")
    else
      info "Installing ${app}…"
      if install_package "$app" &>/dev/null; then
        success "${app} installed successfully."
        newly_installed+=("$app")
      else
        error "Failed to install ${app}."
        failed+=("$app")
      fi
    fi
  done

  # ── Summary ────────────────────────────────────────────────────────────────
  echo ""
  echo -e "${BOLD}======================================${RESET}"
  echo -e "${BOLD}   Summary                            ${RESET}"
  echo -e "${BOLD}======================================${RESET}"

  echo -e "\n${GREEN}${BOLD}Newly installed (${#newly_installed[@]}):${RESET}"
  if [[ ${#newly_installed[@]} -eq 0 ]]; then
    echo "  (none)"
  else
    for app in "${newly_installed[@]}"; do echo "  ✔  $app"; done
  fi

  echo -e "\n${YELLOW}${BOLD}Already installed (${#already_installed[@]}):${RESET}"
  if [[ ${#already_installed[@]} -eq 0 ]]; then
    echo "  (none)"
  else
    for app in "${already_installed[@]}"; do echo "  ●  $app"; done
  fi

  if [[ ${#failed[@]} -gt 0 ]]; then
    echo -e "\n${RED}${BOLD}Failed (${#failed[@]}):${RESET}"
    for app in "${failed[@]}"; do echo "  ✘  $app"; done
    echo ""
    exit 1
  fi

  echo ""
}

main "$@"