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

usage() {
  cat <<'EOF'
Usage: install.sh [--hub URL] [--bin DIR] [--no-pair]

Installs the Watch Agent Assistant channel plugin, writes a `claude-watchagent` launcher
and pairs your Apple Watch in one go. From a checkout it uses the plugin next to
this script. Otherwise it downloads the plugin from the website:

  curl -fsSL https://watchagentassistant.alasolutions.co.uk/install.sh | bash

  --hub URL   use a self-hosted or local hub (e.g. http://localhost:8787)
  --bin DIR   where to put the launcher (default ~/.local/bin)
  --no-pair   install only; pair later with: claude-watchagent-pair
EOF
}

hub=""
bin="$HOME/.local/bin"
pair=1
while [ $# -gt 0 ]; do
  case "$1" in
    --hub) hub="${2:?--hub needs a URL}"; shift 2 ;;
    --bin) bin="${2:?--bin needs a directory}"; shift 2 ;;
    --no-pair) pair=0; shift ;;
    -h|--help) usage; exit 0 ;;
    *) echo "Unknown option: $1" >&2; usage >&2; exit 2 ;;
  esac
done

site="${WATCHPILOT_SITE:-https://watchagentassistant.alasolutions.co.uk}"

need() {
  command -v "$1" >/dev/null 2>&1 && return
  echo "Missing $1. $2" >&2
  exit 1
}
need bun "Install it with: curl -fsSL https://bun.sh/install | bash"
need claude "Install Claude Code first: https://claude.com/claude-code"

# Piped through bash there is no script file, so BASH_SOURCE is empty.
here="$(dirname "${BASH_SOURCE[0]:-.}")"
if [ -f "$here/plugins/watchagent/package.json" ]; then
  plugin="$(cd "$here/plugins/watchagent" && pwd)"
else
  plugin="${XDG_DATA_HOME:-$HOME/.local/share}/watchagent/plugin"
  echo "Downloading the Watch Agent Assistant plugin from $site..."
  tmp="$(mktemp -d)"
  trap 'rm -rf "$tmp"' EXIT
  curl -fsSL "$site/download/watchagent-channel.tar.gz" | tar -xzf - -C "$tmp"
  mkdir -p "$(dirname "$plugin")"
  rm -rf "$plugin"
  mv "$tmp/watchagent" "$plugin"
  echo "Installed the plugin in $plugin"
fi

echo "Installing plugin dependencies..."
(cd "$plugin" && bun install --production --frozen-lockfile --no-summary)

env_lines=""
if [ -n "$hub" ]; then
  env_lines="export WATCHPILOT_DEV=1
export WATCHPILOT_HUB_URL=$(printf '%q' "$hub")"
fi

mkdir -p "$bin"
cat >"$bin/claude-watchagent" <<EOF
#!/usr/bin/env bash
$env_lines
exec claude --plugin-dir $(printf '%q' "$plugin") --dangerously-load-development-channels plugin:watchagent@inline "\$@"
EOF
cat >"$bin/claude-watchagent-pair" <<EOF
#!/usr/bin/env bash
$env_lines
exec bun $(printf '%q' "$plugin/cli.ts") setup "\$@"
EOF
chmod 755 "$bin/claude-watchagent" "$bin/claude-watchagent-pair"
echo "Wrote $bin/claude-watchagent and $bin/claude-watchagent-pair"

# Before the rename the launchers were claude-watchpilot and claude-watchpilot-pair.
# Point any left in $bin at the new ones. Pairing state stays where it is.
for old in claude-watchpilot claude-watchpilot-pair; do
  [ -f "$bin/$old" ] || continue
  new="claude-watchagent${old#claude-watchpilot}"
  cat >"$bin/$old" <<EOF
#!/usr/bin/env bash
echo "$old is now called $new." >&2
exec $(printf '%q' "$bin/$new") "\$@"
EOF
  chmod 755 "$bin/$old"
  echo "Pointed $old at $new"
done
old_plugin="${XDG_DATA_HOME:-$HOME/.local/share}/watchpilot/plugin"
if [ "$old_plugin" != "$plugin" ] && [ -f "$old_plugin/.claude-plugin/plugin.json" ]; then
  rm -rf "$old_plugin"
  rmdir "$(dirname "$old_plugin")" 2>/dev/null || true
  echo "Removed the previous plugin copy in $old_plugin"
fi
case ":$PATH:" in
  *":$bin:"*) ;;
  *) echo "Add $bin to your PATH, e.g.: echo 'export PATH=\"$bin:\$PATH\"' >> ~/.zshrc" ;;
esac

# Pairing reads codes from the keyboard, which is not stdin under curl | bash.
# Read from the terminal's own device rather than /dev/tty: on macOS, Bun
# can't poll /dev/tty and readline fails with "EINVAL: invalid argument, kqueue".
if [ "$pair" = 1 ]; then
  echo
  tty_dev="/dev/$(ps -o tty= -p $$ 2>/dev/null | tr -d ' ')"
  if [ -t 0 ]; then
    "$bin/claude-watchagent-pair"
  elif [ -c "$tty_dev" ] && { : <"$tty_dev"; } 2>/dev/null; then
    "$bin/claude-watchagent-pair" <"$tty_dev"
  else
    echo "No terminal to pair from. Pair later with: $bin/claude-watchagent-pair"
  fi
fi

echo
echo "Done. Start Claude Code with the channel by running: claude-watchagent"
echo "On first launch choose \"I am using this for local development\"."