#!/usr/bin/env bash
#
# Homelab monitoring, Part 3: Ready-made dashboards, sorted into folders
# https://www.zadran.net/guides/homelab-monitoring-3-dashboards-in-folders
# Generated from the guide, last updated 2026-10-13.
#
# NO WARRANTY. This script is provided as is. You are responsible for
# understanding what it does before running it, and for the consequences.
# Take a backup first. See https://www.zadran.net/disclaimer
#
# Destructive steps are left commented out on purpose -- uncomment them
# only once you have understood what they do.

set -euo pipefail

mkdir -p /opt/monitoring/grafana/provisioning/dashboards/files/{Servers,Network}

cat > /opt/monitoring/grafana/provisioning/dashboards/dashboards.yaml <<'EOF'
apiVersion: 1
providers:
  - name: homelab
    orgId: 1
    type: file
    disableDeletion: true
    allowUiUpdates: false
    updateIntervalSeconds: 60
    options:
      path: /etc/grafana/provisioning/dashboards/files
      foldersFromFilesStructure: true
EOF

fix_ds() {
  jq 'walk(if type == "string" then gsub("\\$\\{DS_PROMETHEUS\\}"; "prometheus") else . end)
      | del(.__inputs, .__requires, .__elements) | .id = null' "$1"
}
cd /tmp

curl -fsSL -o 1860.json https://grafana.com/api/dashboards/1860/revisions/latest/download
fix_ds 1860.json > /opt/monitoring/grafana/provisioning/dashboards/files/Servers/node-exporter-full.json

curl -fsSL -o 10347.json https://grafana.com/api/dashboards/10347/revisions/4/download
CPU='100 - avg(rate(node_cpu_seconds_total{mode="idle", instance=~"$instance:.*"}[1m])) * 100'
fix_ds 10347.json | jq --arg cpu "$CPU" '
    (.. | objects | select(.id? == 7 and has("targets"))) |=
        (.targets |= [.[0] | .expr = $cpu]
         | .fieldConfig.defaults.unit = "percent" | .fieldConfig.defaults.max = 100
         | .fieldConfig.defaults.thresholds.steps[1].value = 70
         | .fieldConfig.defaults.thresholds.steps[2].value = 90)
  | (.. | objects | select(.id? == 23 and has("targets"))) |=
        (.targets |= [.[0] | .expr = $cpu]
         | .fieldConfig.defaults.unit = "percent" | .fieldConfig.defaults.min = 0 | .fieldConfig.defaults.max = 100)
  | (.. | objects | select(.id? == 22 and has("targets"))) |=
        (.targets[0].expr = "count(count by (cpu) (node_cpu_seconds_total{instance=~\"$instance:.*\"}))")
' > /opt/monitoring/grafana/provisioning/dashboards/files/Servers/proxmox.json
grep -c node_cpu_seconds_total /opt/monitoring/grafana/provisioning/dashboards/files/Servers/proxmox.json

curl -fsSL -o /opt/monitoring/grafana/provisioning/dashboards/files/Servers/nas-pools.json \
  https://www.zadran.net/downloads/grafana/dashboards/nas-pools.json

D=/opt/monitoring/grafana/provisioning/dashboards/files/Network
RAW=https://raw.githubusercontent.com/unpoller/dashboards/adbe342f09d0fe06b1cc152d28ab0bae5ee3d8b9/v2.0.0
for pair in "Client%20Insights:unifi-clients" "Network%20Sites:unifi-sites" "UAP%20Insights:unifi-uap" "USW%20Insights:unifi-usw"; do
  curl -fsSL -o "/tmp/${pair#*:}.json" "$RAW/UniFi-Poller_%20${pair%%:*}%20-%20Prometheus.json"
  fix_ds "/tmp/${pair#*:}.json" > "$D/${pair#*:}.json"
done
jq '
    walk(if type == "object" and has("panels") then .panels |= map(select(.id != 32)) else . end)
  | (.. | objects | select(.id? == 48 and has("targets"))) |=
        (.targets[0].expr = "count(unpoller_client_uptime_seconds{site_name=~\"$Site\", ap_name=~\"$AP\", wired=\"false\"}) or vector(0)")
  | (.. | objects | select(.id? == 60 and has("targets"))) |=
        (.targets[0].expr = "count(unpoller_client_uptime_seconds{site_name=~\"$Site\", ap_name=~\"$AP\", wired=\"false\", essid=~\"(?i).*guest.*\"}) or vector(0)")
  | (.. | objects | select((.id? == 52 or .id? == 54 or .id? == 56) and has("targets"))) |=
        (.targets |= map(.instant = true | .range = false))
' "$D/unifi-uap.json" > /tmp/uap.json && mv /tmp/uap.json "$D/unifi-uap.json"
ls -1 $D

cd /opt/monitoring && docker compose restart grafana
sleep 20
set -a; . /opt/monitoring/.env; set +a
curl -s -u "admin:$GRAFANA_ADMIN_PASSWORD" 'localhost:3000/api/search?type=dash-db' |
  jq -r '.[] | "\(.folderTitle)\t\(.title)"' | sort | column -t -s $'\t'