#!/bin/bash
#
# Deploy script for the production host (WebApp-Testing-live).
#
# The app runs there as a PM2 process ("my-weekly-todo") from /root/My-Weekly-ToDo-List.
# It is NOT run under Docker — deploy.sh and docker-compose.yml in this repo describe an
# older Portainer setup that is not what serves todo.martin-bierschenk.de.
#
# Usage on the host:  /root/My-Weekly-ToDo-List/scripts/update-app.sh
#
# The whole body is wrapped in a function so bash parses it in one go: this script lives
# inside the very checkout it updates, and `git pull` rewriting it mid-run would otherwise
# make bash resume at a stale file offset.

main() {
    set -euo pipefail

    # Fail fast instead of hanging on a credential prompt when run without a terminal
    # (e.g. from systemd). The host authenticates via a read-only SSH deploy key.
    export GIT_TERMINAL_PROMPT=0

    local APP_DIR="/root/My-Weekly-ToDo-List"
    local PM2_APP="my-weekly-todo"

    cd "$APP_DIR"

    echo "--- Pulling latest changes from git ---"
    git pull origin main

    # npm ci, not npm install: it installs exactly what package-lock.json specifies and
    # never rewrites it. npm install rewrites the lockfile, which leaves the working tree
    # dirty and makes the *next* git pull abort.
    echo "--- Installing dependencies ---"
    npm ci

    echo "--- Building application ---"
    npm run build

    # next.config.js sets output: 'standalone', and Next.js does NOT copy public/ or
    # .next/static/ into .next/standalone — that is a documented manual step. Skipping it
    # ships new server code whose HTML references new chunk hashes while the old chunks sit
    # in the standalone tree: they 404, React never hydrates, and every page hangs on its
    # server-rendered shell ("Loading session...") while the API still answers 200.
    echo "--- Copying static assets into standalone output ---"
    cp -r public .next/standalone/
    cp -r .next/static .next/standalone/.next/

    echo "--- Restarting PM2 process ---"
    pm2 restart "$PM2_APP" --update-env
    pm2 save

    echo "--- Update Complete ---"
    echo "Deployed version: $(node -p "require('$APP_DIR/package.json').version")"
}

main "$@"