#!/usr/bin/env bash
# webapp installer — runs inside the LXC, called by ct/webapp.sh
#
# Sets up a Next.js site deployed by a self-hosted Gitea Actions runner:
#   - Node.js (NodeSource) + git + rsync + sudo
#   - act_runner in HOST mode (no Docker), registered to the Gitea instance,
#     running as the unprivileged `webapp` user and polling Gitea outbound
#   - a systemd service running `next start` from /opt/webapp/current
#   - a narrow sudoers rule so the runner may only restart that one service
#
# The actual build/deploy logic lives in the repo's .gitea/workflows/deploy.yml
# (deploy-as-code). The runner checks out, builds, syncs the result into
# /opt/webapp/current and restarts webapp.service.

set -euo pipefail

APP="webapp"
LIB_URL="${LIB_URL:-https://gitea.luki-net.org/luki-net/proxmox-scripts/raw/branch/main/lib}"
source <(curl -fsSL "$LIB_URL/install.func")

[[ "$EUID" -eq 0 ]] || { msg_err "Must run as root"; exit 1; }

# ── load deploy config pushed in by the host script ──────────────────────────
CONF="/root/webapp.deploy.env"
[[ -f "$CONF" ]] || { msg_err "$CONF not found (host bootstrap incomplete)"; exit 1; }
set -a; . "$CONF"; set +a

: "${GITEA_INSTANCE_URL:?missing GITEA_INSTANCE_URL}"
: "${RUNNER_TOKEN:?missing RUNNER_TOKEN}"
APP_PORT="${APP_PORT:-3000}"
NODE_MAJOR="${NODE_MAJOR:-22}"
RUNNER_VERSION="${RUNNER_VERSION:-0.2.13}"
RUNNER_LABELS="${RUNNER_LABELS:-webapp:host}"
RUNNER_NAME="${RUNNER_NAME:-$(hostname)}"

APP_USER="webapp"
APP_HOME="/opt/webapp"
RUNNER_DIR="$APP_HOME/runner"
CURRENT_DIR="$APP_HOME/current"
CONF_DIR="/etc/webapp"
ENV_FILE="$CONF_DIR/env"

run_user() { runuser -u "$APP_USER" -- env HOME="$APP_HOME" "$@"; }

# ── packages: git + rsync + sudo ; Node.js via NodeSource ────────────────────
setup_base_apt git rsync sudo

NODE_HAVE="$(command -v node >/dev/null 2>&1 && node -v | sed -E 's/^v([0-9]+).*/\1/' || echo 0)"
if [[ "$NODE_HAVE" != "$NODE_MAJOR" ]]; then
  msg_info "Installing Node.js ${NODE_MAJOR}.x (NodeSource)..."
  curl -fsSL "https://deb.nodesource.com/setup_${NODE_MAJOR}.x" | bash - >/dev/null
  apt-get install -y -qq nodejs >/dev/null
  msg_ok "Node $(node -v) installed"
else
  msg_warn "Node $(node -v) already present, skipping"
fi

# ── act_runner binary ─────────────────────────────────────────────────────────
if [[ ! -x /usr/local/bin/act_runner ]]; then
  ARCH="$(dpkg --print-architecture)"
  case "$ARCH" in amd64|arm64) ;; *) msg_err "unsupported arch: $ARCH"; exit 1 ;; esac
  msg_info "Downloading act_runner $RUNNER_VERSION ($ARCH)..."
  curl -fsSL "https://dl.gitea.com/act_runner/${RUNNER_VERSION}/act_runner-${RUNNER_VERSION}-linux-${ARCH}" \
    -o /usr/local/bin/act_runner
  chmod +x /usr/local/bin/act_runner
  msg_ok "act_runner $(/usr/local/bin/act_runner --version 2>/dev/null | head -n1)"
else
  msg_warn "act_runner already present, skipping download"
fi

# ── user + dirs ──────────────────────────────────────────────────────────────
create_system_user "$APP_USER" "$APP_HOME"
mkdir -p "$RUNNER_DIR" "$CURRENT_DIR" "$CONF_DIR"
chown -R "$APP_USER:$APP_USER" "$APP_HOME"

# ── env file: NEXT_PUBLIC_* are inlined at build time AND read at runtime ────
# (kept on the host so the repo carries no environment-specific config; the
#  workflow sources this file before `next build`.)
cat >"$ENV_FILE" <<EOF
NODE_ENV=production
NEXT_TELEMETRY_DISABLED=1
NEXT_PUBLIC_SITE_URL=$NEXT_PUBLIC_SITE_URL
NEXT_PUBLIC_SANITY_PROJECT_ID=${NEXT_PUBLIC_SANITY_PROJECT_ID:-}
NEXT_PUBLIC_SANITY_DATASET=${NEXT_PUBLIC_SANITY_DATASET:-production}
NEXT_PUBLIC_SANITY_API_VERSION=${NEXT_PUBLIC_SANITY_API_VERSION:-2026-06-02}
NEXT_PUBLIC_CALENDLY_URL=${NEXT_PUBLIC_CALENDLY_URL:-}
EOF
chown root:"$APP_USER" "$ENV_FILE"
chmod 640 "$ENV_FILE"

# ── register the runner (idempotent) ─────────────────────────────────────────
if [[ ! -f "$RUNNER_DIR/.runner" ]]; then
  msg_info "Registering runner '$RUNNER_NAME' [$RUNNER_LABELS] with $GITEA_INSTANCE_URL..."
  run_user bash -c "cd '$RUNNER_DIR' && /usr/local/bin/act_runner register \
    --no-interactive \
    --instance '$GITEA_INSTANCE_URL' \
    --token '$RUNNER_TOKEN' \
    --name '$RUNNER_NAME' \
    --labels '$RUNNER_LABELS'"
  chown -R "$APP_USER:$APP_USER" "$RUNNER_DIR"
  msg_ok "Runner registered"
else
  msg_warn "Runner already registered (.runner exists), skipping"
fi

# ── narrow sudoers: runner may ONLY (re)start/stop/status webapp.service ─────
cat >/etc/sudoers.d/webapp-deploy <<EOF
$APP_USER ALL=(root) NOPASSWD: /usr/bin/systemctl restart webapp.service, /usr/bin/systemctl start webapp.service, /usr/bin/systemctl stop webapp.service, /usr/bin/systemctl status webapp.service
EOF
chmod 440 /etc/sudoers.d/webapp-deploy
visudo -cf /etc/sudoers.d/webapp-deploy >/dev/null

# ── systemd units ─────────────────────────────────────────────────────────────
# webapp.service: serves the built site from the live copy. Enabled (so it
# starts on boot) but not started now — the first workflow run populates
# /opt/webapp/current and starts it via the sudoers-allowed restart.
cat >/etc/systemd/system/webapp.service <<EOF
[Unit]
Description=webapp — Next.js production server
After=network-online.target
Wants=network-online.target

[Service]
Type=simple
User=$APP_USER
Group=$APP_USER
WorkingDirectory=$CURRENT_DIR
EnvironmentFile=$ENV_FILE
ExecStart=/usr/bin/npm run start -- -H 0.0.0.0 -p $APP_PORT
Restart=on-failure
RestartSec=5
NoNewPrivileges=true
ProtectSystem=full
PrivateTmp=true

[Install]
WantedBy=multi-user.target
EOF

cat >/etc/systemd/system/webapp-runner.service <<EOF
[Unit]
Description=webapp — Gitea Actions runner (host mode, deploy)
After=network-online.target
Wants=network-online.target

[Service]
Type=simple
User=$APP_USER
Group=$APP_USER
WorkingDirectory=$RUNNER_DIR
Environment=HOME=$APP_HOME
Environment=PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
ExecStart=/usr/local/bin/act_runner daemon
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl enable webapp.service >/dev/null 2>&1
systemctl enable --now webapp-runner.service
msg_ok "systemd units installed (runner started; webapp.service enabled, starts on first deploy)"

# ── notes / summary file ──────────────────────────────────────────────────────
CRED_FILE="/root/webapp.credentials"
cat >"$CRED_FILE" <<EOF
webapp — Next.js site deployed via a self-hosted Gitea Actions runner

Repo (informational):  ${REPO_URL:-<your website repo>}
Gitea instance:        $GITEA_INSTANCE_URL
Runner name / labels:  $RUNNER_NAME  [$RUNNER_LABELS]   (act_runner $RUNNER_VERSION, host mode)
Site (local):          http://127.0.0.1:$APP_PORT   (live after first deploy)
Live copy:             $CURRENT_DIR
Site env (build+run):  $ENV_FILE

Deploy is driven by the repo workflow .gitea/workflows/deploy.yml
First deploy:          push to the repo, OR repo -> Actions -> deploy -> "Run workflow"

Manual restart:        sudo systemctl restart webapp.service
Logs:                  journalctl -u webapp -u webapp-runner -f

Prerequisites on the Gitea side:
  - Actions enabled on the instance and on the repo (repo -> Settings -> Actions)
  - The LXC needs outbound HTTPS to $GITEA_INSTANCE_URL and to github.com
    (the latter only to fetch actions/checkout, unless you self-host actions)
EOF
chmod 600 "$CRED_FILE"

# registration token already consumed → drop the bootstrap env file
shred -u "$CONF" 2>/dev/null || rm -f "$CONF"

apt_cleanup
msg_ok "$APP installation finished"