#!/bin/bash
# Grafana OSS bootstrap for the apm-wo-analysis dashboard host (Amazon Linux 2023,
# ARM64). Idempotent enough to re-run. Config + dashboards are pulled from S3
# (the repo is the source of truth); a systemd timer re-syncs dashboards so panel
# updates ship by re-uploading to S3 — no instance rebuild.
#
# Templated by CDK: __CONFIG_BUCKET__ / __CONFIG_PREFIX__ / __PLUGIN_VERSION__.
set -euxo pipefail

CONFIG_BUCKET="__CONFIG_BUCKET__"
CONFIG_PREFIX="__CONFIG_PREFIX__"
PLUGIN_VERSION="__PLUGIN_VERSION__"

# --- Grafana OSS repo + install ---
cat >/etc/yum.repos.d/grafana.repo <<'REPO'
[grafana]
name=grafana
baseurl=https://rpm.grafana.com
repo_gpgcheck=1
enabled=1
gpgcheck=1
gpgkey=https://rpm.grafana.com/gpg.key
sslverify=1
REPO
dnf install -y grafana

# --- Athena datasource plugin (pinned for reproducibility) ---
# --homepath is required or grafana-cli can't find its config defaults.
grafana-cli --homepath=/usr/share/grafana --pluginsDir=/var/lib/grafana/plugins \
  plugins install grafana-athena-datasource "${PLUGIN_VERSION}"

# --- grafana.ini: behind the ALB at grafana.seahaven.com, kiosk-friendly ---
cat >/etc/grafana/grafana.ini <<'INI'
[server]
protocol = http
http_port = 3000
root_url = https://grafana.seahaven.com/
enforce_domain = false

[security]
# Behind an office-IP-restricted ALB; allow embedding for the kiosk wall display.
allow_embedding = true
cookie_secure = true

[users]
default_theme = dark

[analytics]
reporting_enabled = false
check_for_updates = false
INI

# --- sync provisioning + dashboards from S3 (repo is source of truth) ---
sync_config() {
  aws s3 sync "s3://${CONFIG_BUCKET}/${CONFIG_PREFIX}/provisioning/" /etc/grafana/provisioning/ --delete --exact-timestamps
  aws s3 sync "s3://${CONFIG_BUCKET}/${CONFIG_PREFIX}/dashboards/" /var/lib/grafana/dashboards/ --delete --exact-timestamps
  chown -R grafana:grafana /etc/grafana/provisioning /var/lib/grafana/dashboards
}
mkdir -p /var/lib/grafana/dashboards
sync_config

systemctl daemon-reload
systemctl enable --now grafana-server

# --- systemd timer: re-sync dashboards every 15 min so repo edits land without a rebuild ---
cat >/usr/local/bin/grafana-config-sync.sh <<SYNC
#!/bin/bash
set -euo pipefail
aws s3 sync "s3://${CONFIG_BUCKET}/${CONFIG_PREFIX}/provisioning/" /etc/grafana/provisioning/ --delete --exact-timestamps
aws s3 sync "s3://${CONFIG_BUCKET}/${CONFIG_PREFIX}/dashboards/" /var/lib/grafana/dashboards/ --delete --exact-timestamps
chown -R grafana:grafana /etc/grafana/provisioning /var/lib/grafana/dashboards
SYNC
chmod +x /usr/local/bin/grafana-config-sync.sh

cat >/etc/systemd/system/grafana-config-sync.service <<'SVC'
[Unit]
Description=Sync apm-wo Grafana config/dashboards from S3
[Service]
Type=oneshot
ExecStart=/usr/local/bin/grafana-config-sync.sh
SVC

cat >/etc/systemd/system/grafana-config-sync.timer <<'TIMER'
[Unit]
Description=Periodic apm-wo Grafana config sync
[Timer]
OnBootSec=5min
OnUnitActiveSec=15min
[Install]
WantedBy=timers.target
TIMER

systemctl daemon-reload
systemctl enable --now grafana-config-sync.timer