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

# Universal Kasy CLI installer for macOS and Linux.
# Hosted at https://kasy.dev/install — run with:
#   curl -fsSL https://kasy.dev/install | bash

CLI_NAME="kasy"
PACKAGE_NAME="${KASY_CLI_PACKAGE:-kasy-cli}"
INSTALL_ROOT="${KASY_CLI_HOME:-$HOME/.kasy}"
BIN_DIR="$INSTALL_ROOT/bin"
CLI_PATH="$BIN_DIR/$CLI_NAME"

detect_platform() {
  case "$(uname -s)" in
    Darwin) printf 'macOS' ;;
    Linux) printf 'Linux' ;;
    *) printf '%s' "$(uname -s)" ;;
  esac
}

select_profile() {
  if [ -n "${KASY_CLI_PROFILE:-}" ]; then
    printf '%s' "$KASY_CLI_PROFILE"
    return
  fi

  for profile in "$HOME/.zshrc" "$HOME/.bashrc" "$HOME/.bash_profile" "$HOME/.profile"; do
    if [ -f "$profile" ]; then
      printf '%s' "$profile"
      return
    fi
  done

  if [ "${SHELL:-}" = "/bin/bash" ]; then
    printf '%s' "$HOME/.bashrc"
  else
    printf '%s' "$HOME/.zshrc"
  fi
}

printf '\n🚀 Kasy CLI Installer\n\n'
printf '📦 Platform: %s\n\n' "$(detect_platform)"

if ! command -v node >/dev/null 2>&1; then
  # On a fresh machine we prepare it for the user instead of asking them to go
  # install Node and start over. macOS: bootstrap Homebrew (also what the Flutter
  # auto-install in `kasy new` relies on), then install Node through it.
  if [ "$(uname -s)" = "Darwin" ]; then
    printf '\n🔧 Node.js is needed and is not installed yet. Setting it up for you...\n\n'

    if ! command -v brew >/dev/null 2>&1; then
      printf '⬇️  Installing Homebrew first (you may be asked for your Mac password)...\n'
      NONINTERACTIVE=1 /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)" || true
      # Put brew on PATH for THIS shell (Apple Silicon vs Intel locations) and,
      # on Apple Silicon, persist it so future terminals find brew (and node).
      for brew_bin in /opt/homebrew/bin/brew /usr/local/bin/brew; do
        if [ -x "$brew_bin" ]; then
          eval "$("$brew_bin" shellenv)"
          if [ "$brew_bin" = "/opt/homebrew/bin/brew" ]; then
            zprofile="$HOME/.zprofile"
            touch "$zprofile"
            line="eval \"\$(/opt/homebrew/bin/brew shellenv)\""
            grep -Fq "$line" "$zprofile" || printf '\n%s\n' "$line" >> "$zprofile"
          fi
        fi
      done
    fi

    if command -v brew >/dev/null 2>&1; then
      printf '⬇️  Installing Node.js...\n'
      brew install node || true
    fi
  fi

  # Re-check. If it is still missing, fall back to clear manual guidance.
  if ! command -v node >/dev/null 2>&1; then
    printf '\n❌ Node.js 18+ is required (the Kasy CLI runs on Node).\n\n' >&2
    if [ "$(uname -s)" = "Darwin" ]; then
      printf '   Could not set it up automatically. Install it by hand, then run this again:\n     brew install node\n\n' >&2
    else
      printf '   Install it with nvm, then run this again:\n     curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.1/install.sh | bash\n     nvm install --lts\n\n' >&2
    fi
    printf '   Or download it from https://nodejs.org\n' >&2
    exit 1
  fi
  printf '✓ Node.js ready\n\n'
fi

if ! command -v npm >/dev/null 2>&1; then
  printf '❌ Error: npm command not found. Reinstall Node.js and run again.\n' >&2
  exit 1
fi

install_target="${PACKAGE_NAME}@latest"
case "$PACKAGE_NAME" in
  /*|./*|../*|~/*|file:*|git+*|http://*|https://*)
    install_target="$PACKAGE_NAME"
    ;;
esac

printf '⬇️  Installing...\n'
npm install -g "$install_target" --prefix "$INSTALL_ROOT" >/dev/null
printf '✓ Installed\n'

if [ ! -x "$CLI_PATH" ]; then
  printf '\n❌ Error: install finished, but %s was not found.\n' "$CLI_PATH" >&2
  exit 1
fi

profile_file="$(select_profile)"
mkdir -p "$(dirname "$profile_file")"
touch "$profile_file"

path_export="export PATH=\"$BIN_DIR:\$PATH\""
if ! grep -Fq "$path_export" "$profile_file"; then
  printf '\n%s\n' "$path_export" >> "$profile_file"
fi

printf '\n🎉 Installation complete!\n\n'
printf 'Close this terminal and open a NEW one, then run:\n'
printf '  %s new\n' "$CLI_NAME"