#!/usr/bin/env bash
#
# Deploy Solid Scribe. Run this ON the server, from inside the repo.
#
#   cd /path/to/SolidScribe && ./deploy.sh
#
# Replaces buildAndUpdateProd.sh, which built the old Vue 2 client and rsynced a
# tarball to /home/mab/pi -- a directory that no longer exists.
#
# Assumes:
#   - this repo is a git clone with a tracking branch
#   - node + pnpm are on PATH for the user running this (on NixOS that means
#     environment.systemPackages or the user's profile -- NOT only inside a
#     nix-shell, or this will fail at the install step)
#   - pm2 is already managing NoteServer (pm2 resurrect on boot)
#   - nginx serves client/dist with an SPA fallback to index.html
#
# nginx is NOT touched here. On NixOS it is declarative -- see configs/.
#

set -euo pipefail

REPO="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
cd "$REPO"

step(){ printf '\n\033[32m::--:: %s\033[0m\n' "$1"; }

# --- sanity checks before changing anything ------------------------------

for tool in git pnpm pm2; do
	command -v "$tool" >/dev/null || { echo "$tool is not on PATH" >&2; exit 1; }
done

if [ -n "$(git status --porcelain --untracked-files=no)" ]; then
	echo "Working tree has local modifications. Commit or stash them first:" >&2
	git status --short >&2
	exit 1
fi

# --- pull ----------------------------------------------------------------

step "Pulling $(git rev-parse --abbrev-ref HEAD)..."
# --ff-only: refuse to create a merge commit on the server. If this fails the
# server has diverged and wants a human.
git pull --ff-only

# --- dependencies --------------------------------------------------------

step "Installing server dependencies..."
pnpm install --frozen-lockfile

step "Installing client dependencies..."
pnpm install --frozen-lockfile --dir client

# --- build ---------------------------------------------------------------

# dist is gitignored, so the server builds it. Built into a temp dir first so a
# failed build leaves the currently-served files untouched.
step "Building client..."
rm -rf client/dist.new
pnpm --dir client exec vite build --outDir dist.new --emptyOutDir

if [ ! -f client/dist.new/index.html ] || [ ! -f client/dist.new/sw.js ]; then
	echo "Build output looks wrong (missing index.html or sw.js) -- keeping the previous build." >&2
	rm -rf client/dist.new
	exit 1
fi

step "Swapping in the new build..."
rm -rf client/dist.old
[ -d client/dist ] && mv client/dist client/dist.old
mv client/dist.new client/dist
rm -rf client/dist.old

# --- restart -------------------------------------------------------------

step "Reloading the API server..."
# reload, not restart: graceful in cluster mode. --update-env so changes to
# ecosystem.config.js are picked up.
pm2 reload "$REPO/server/ecosystem.config.js" --env production --update-env

# Persist the process list so `pm2 resurrect` on boot gets the current state.
pm2 save

step "Done."
pm2 list