#!/usr/bin/env bash
# install.hermes.sh — adapter-specific step of install.sh.
#
# The parent installer has already copied the plugin source to
# $PREFIX and prepared $HOME_DIR. Here we handle the Hermes-specific
# extras:
#
#   1. Install node_modules inside $PREFIX (idempotent).
#   2. Build the viewer bundle so the HTTP server has static assets
#      available.
#   3. Symlink the Python memos_provider package into the Hermes
#      plugins directory so `from memos_provider import MemTensorProvider`
#      resolves from Hermes without extra path munging.
#
# We never modify the Hermes host process — its plugin manager picks
# up $PREFIX on next start.

set -euo pipefail

: "${AGENT:?install.hermes.sh expects AGENT to be set by the parent installer}"
: "${PREFIX:?install.hermes.sh expects PREFIX to be set by the parent installer}"
: "${HOME_DIR:?install.hermes.sh expects HOME_DIR to be set by the parent installer}"

log() { printf "\033[1;36m[install:hermes]\033[0m %s\n" "$*"; }
warn() { printf "\033[1;33m[install:hermes]\033[0m %s\n" "$*" >&2; }

cd "$PREFIX"

# Keep the Hermes manifest aligned with the npm package before exposing the
# provider directory to the host. Older local source layouts may not contain
# the helper, so retain the packaged manifest as a compatibility fallback.
VERSION_SYNC_SCRIPT="$PREFIX/scripts/sync-hermes-version.cjs"
if command -v node >/dev/null 2>&1 && [[ -f "$VERSION_SYNC_SCRIPT" ]]; then
  node "$VERSION_SYNC_SCRIPT" "$PREFIX" >/dev/null
else
  warn "Hermes version sync helper unavailable; using packaged plugin.yaml as-is."
fi
cp "$PREFIX/adapters/hermes/plugin.yaml" \
  "$PREFIX/adapters/hermes/memos_provider/plugin.yaml"

# ── 1. node_modules ───────────────────────────────────────────────────────────
if command -v npm >/dev/null 2>&1; then
  command -v node > .memos-node-bin
  if [[ -d "node_modules" ]]; then
    log "node_modules already present — skipping install"
  else
    log "Installing npm dependencies (this can take a minute)…"
    npm install --no-audit --no-fund --prefer-offline
  fi
else
  warn "npm not found on PATH; the bridge runtime requires Node.js ≥ 20."
fi

# ── 2. viewer bundle ──────────────────────────────────────────────────────────
if [[ -x "./node_modules/.bin/vite" ]]; then
  log "Building viewer bundle → viewer/dist/"
  ./node_modules/.bin/vite build --config vite.config.ts >/dev/null
else
  warn "vite not found in node_modules; skipping bundle build"
fi

# ── 3. wire up Python provider ────────────────────────────────────────────────
# Hermes source-tree upgrades can replace the checkout-local
# plugins/memory directory, so always maintain a user-level link too.
: "${HOME:?HOME must be set for user-level plugin directory creation}"
USER_HERMES_PLUGINS_DIR="${HOME}/.hermes/plugins/memory"
mkdir -p "$USER_HERMES_PLUGINS_DIR"
USER_TARGET="$USER_HERMES_PLUGINS_DIR/memtensor"
# Clean up a pre-existing non-symlink entry (file or dir) left over from
# a previous manual install so `ln -sfn` doesn't refuse or misbehave.
if [[ -L "$USER_TARGET" ]]; then rm "$USER_TARGET"
elif [[ -e "$USER_TARGET" ]]; then rm -rf "$USER_TARGET"
fi
ln -sfn "$PREFIX/adapters/hermes/memos_provider" "$USER_TARGET"
log "Linked Python provider → $USER_TARGET"

if [[ -n "${HERMES_PLUGINS_DIR:-}" ]]; then
  mkdir -p "$HERMES_PLUGINS_DIR"
  HERMES_TARGET="$HERMES_PLUGINS_DIR/memtensor"
  # Remove the legacy 'memos_provider' symlink name if it lingers from an
  # earlier installer version, so re-running the script doesn't leave a
  # dangling reference behind.
  LEGACY_TARGET="$HERMES_PLUGINS_DIR/memos_provider"
  if [[ -L "$LEGACY_TARGET" ]]; then
    rm "$LEGACY_TARGET"
    log "Removed legacy symlink $LEGACY_TARGET"
  fi
  if [[ -L "$HERMES_TARGET" ]]; then rm "$HERMES_TARGET"
  elif [[ -e "$HERMES_TARGET" ]]; then rm -rf "$HERMES_TARGET"
  fi
  ln -sfn "$PREFIX/adapters/hermes/memos_provider" "$HERMES_TARGET"
  log "Linked Python provider → $HERMES_TARGET"
else
  log "HERMES_PLUGINS_DIR not set; user-level provider link was created."
fi

log "Hermes adapter install complete."
log "  Plugin code:   $PREFIX"
log "  Runtime data:  $HOME_DIR"
log "  Viewer:        http://127.0.0.1:18910/"