#!/bin/bash
# Tesseract — VM-side deploy script.  Idempotent: safe to re-run.
#
# Run on the Oracle VM after `git clone`:
#   cd /opt/tesseract
#   ./deploy/deploy.sh
#
# What it does:
#   1. Pulls latest code (skip with --no-pull for first run from a clone)
#   2. Installs/updates Python deps if requirements.txt changed
#   3. Installs/updates Node deps if package-lock.json changed
#   4. Builds the SPA into studio/dist/
#   5. Captures the git sha into .env so /api/version is correct
#   6. Restarts the systemd unit
#
# Exits non-zero on any step failure — systemd won't be touched if the build
# broke, so the previous version keeps serving.

set -euo pipefail

ROOT="$(cd "$(dirname "$0")/.." && pwd)"
cd "$ROOT"

NO_PULL=0
for arg in "$@"; do
  case "$arg" in
    --no-pull) NO_PULL=1 ;;
    --help|-h)
      echo "Usage: $0 [--no-pull]"
      echo "  --no-pull   skip 'git pull' (use on the first deploy after cloning)"
      exit 0 ;;
  esac
done

# ── 1. Pull ───────────────────────────────────────────────────────────────────
if [ "$NO_PULL" -eq 0 ]; then
  echo "→ git pull"
  git pull --ff-only
fi

# ── 2. Python deps ────────────────────────────────────────────────────────────
# Hash-compare requirements.txt against the last successful install so we
# only run pip when something actually changed.
REQ="$ROOT/app/requirements.txt"
HASH_FILE="$ROOT/.venv/.requirements.sha"
CURRENT_HASH=$(sha256sum "$REQ" | cut -d' ' -f1)
LAST_HASH=$(cat "$HASH_FILE" 2>/dev/null || echo "")

if [ "$CURRENT_HASH" != "$LAST_HASH" ]; then
  echo "→ pip install (requirements.txt changed)"
  "$ROOT/.venv/bin/pip" install --upgrade -r "$REQ"
  echo "$CURRENT_HASH" > "$HASH_FILE"
else
  echo "→ pip install skipped (requirements.txt unchanged)"
fi

# ── 3. Node deps ──────────────────────────────────────────────────────────────
LOCK="$ROOT/studio/package-lock.json"
NODE_HASH_FILE="$ROOT/studio/.npm.sha"
NODE_CURRENT_HASH=$(sha256sum "$LOCK" | cut -d' ' -f1)
NODE_LAST_HASH=$(cat "$NODE_HASH_FILE" 2>/dev/null || echo "")

if [ "$NODE_CURRENT_HASH" != "$NODE_LAST_HASH" ]; then
  echo "→ npm ci (package-lock.json changed)"
  (cd "$ROOT/studio" && npm ci --no-audit --no-fund)
  echo "$NODE_CURRENT_HASH" > "$NODE_HASH_FILE"
else
  echo "→ npm install skipped (package-lock.json unchanged)"
fi

# ── 4. Build SPA ──────────────────────────────────────────────────────────────
echo "→ npm run build"
(cd "$ROOT/studio" && npm run build)

# ── 5. Capture git sha into .env ──────────────────────────────────────────────
GIT_SHA=$(git rev-parse --short HEAD)
BUILT_AT=$(date -u +%Y-%m-%dT%H:%M:%SZ)
if [ -f "$ROOT/.env" ]; then
  # Replace existing lines if present, append if not.  In-place edit via
  # a tmpfile so a partial write can't corrupt .env.
  TMP=$(mktemp)
  grep -v -E '^(TESSERACT_GIT_SHA|TESSERACT_BUILT_AT)=' "$ROOT/.env" > "$TMP" || true
  echo "TESSERACT_GIT_SHA=$GIT_SHA"    >> "$TMP"
  echo "TESSERACT_BUILT_AT=$BUILT_AT"  >> "$TMP"
  mv "$TMP" "$ROOT/.env"
  chmod 600 "$ROOT/.env"
  echo "→ stamped .env with sha=$GIT_SHA"
else
  echo "→ WARNING: .env missing — skipping sha stamp"
fi

# ── 6. Restart ────────────────────────────────────────────────────────────────
echo "→ systemctl restart tesseract"
sudo systemctl restart tesseract

# Give systemd a beat to start the worker, then report status.
sleep 1
sudo systemctl status tesseract --no-pager --lines=5

echo ""
echo "✓ Deploy complete.  Tail logs with:  sudo journalctl -u tesseract -f"