#!/usr/bin/env bash
#
# Auto-deploy SkateSpots to Netlify when the published origin/main changes.
#
# Driven by the systemd user timer `skatespots-deploy.timer`. It is SAFE by
# construction: it only ever deploys committed code, and it never touches a
# dirty working tree.
#
# One-time setup (see AGENTS.md):
#   netlify login
#   netlify link        # choose the existing SkateSpots site
#
# Manual run / debug:
#   scripts/auto-deploy.sh
#   journalctl --user -u skatespots-deploy -n 50
#
set -euo pipefail

REPO="/home/sovereignsk8/SkateSpots"
# systemd runs with a minimal PATH; node/npm live under nvm here.
export PATH="/home/sovereignsk8/.nvm/versions/node/v22.23.1/bin:$PATH"

STATE_DIR="$HOME/.local/state/skatespots-deploy"
SHA_FILE="$STATE_DIR/last-deployed-sha"
LOCK_FILE="$STATE_DIR/last-lock-hash"
mkdir -p "$STATE_DIR"

log() { echo "[$(date -Is)] $*"; }

# Serialise runs (a slow deploy must not overlap the next timer tick).
exec 9>"$STATE_DIR/.lock"
if ! flock -n 9; then
  log "another deploy is already running — skipping"
  exit 0
fi

cd "$REPO"

# 1. What is published now?
if ! git fetch --quiet origin main; then
  log "git fetch failed — skipping"
  exit 0
fi

REMOTE_SHA="$(git rev-parse origin/main)"
LAST_SHA="$(cat "$SHA_FILE" 2>/dev/null || true)"

if [ "$REMOTE_SHA" = "$LAST_SHA" ]; then
  exit 0 # nothing new since the last deploy
fi

# 2. Only deploy committed code (ignore untracked build/generated files).
if [ -n "$(git status --porcelain --untracked-files=no)" ]; then
  log "origin/main moved to ${REMOTE_SHA:0:9} but tracked files are modified — skipping"
  exit 0
fi

# 3. Move the repo to the published commit (fast-forward only).
if [ "$(git rev-parse HEAD)" != "$REMOTE_SHA" ]; then
  if git merge --ff-only --quiet origin/main; then
    log "fast-forwarded to ${REMOTE_SHA:0:9}"
  else
    log "local main has diverged from origin/main — skipping"
    exit 0
  fi
fi

# 4. Re-install only when the lockfile changed (avoid `npm run build`'s own `npm i`,
#    which can rewrite the lock and dirty the tree).
LOCK_HASH="$(git rev-parse HEAD:package-lock.json)"
if [ "$LOCK_HASH" != "$(cat "$LOCK_FILE" 2>/dev/null || true)" ]; then
  log "package-lock changed — npm ci"
  npm ci --silent
  echo "$LOCK_HASH" > "$LOCK_FILE"
fi

# 5. Build the web bundle directly (skip the `npm i` in `npm run build`).
log "building…"
./node_modules/.bin/vite build -l error
cp dist/index.html dist/404.html

# 6. Smoke-test the built bundle — abort if it doesn't boot.
#    `vite build` never executes its output, so this is the only guard against
#    a production-only crash (e.g. the manualChunks TDZ) reaching the site.
log "smoke-testing the built bundle…"
if ! node scripts/smoke-test.mjs; then
  log "SMOKE TEST FAILED — aborting deploy (the built bundle did not boot)"
  exit 1
fi

# 7. Deploy to Netlify production.
log "deploying to Netlify…"
netlify deploy --prod --dir=dist

echo "$REMOTE_SHA" > "$SHA_FILE"
log "deployed ${REMOTE_SHA:0:9} ✓"