#!/usr/bin/env bash
# Despliega metrics_agent en un nodo remoto como servicio systemd.
#
# Uso: ./deploy_agent.sh <node_name> <ssh_host> <role> [arch]
#   node_name : valor de la label "instance" en Grafana (ej. homer)
#   ssh_host  : alias SSH del nodo (debe existir en ~/.ssh/config)
#   role      : label "role" para filtrar en Grafana (local | vps | movil)
#   arch      : amd64 (default) | arm64
#
# Requisitos:
#   - Binario compilado en apps/metrics_agent/dist/metrics_agent_<arch>
#     (compila con: cd apps/metrics_agent && CGO_ENABLED=0 GOOS=linux GOARCH=<arch> \
#                    go build -ldflags="-s -w" -o dist/metrics_agent_<arch> .)
#   - `pass fleet/ingest-pass` con el password de ingesta.
#   - sudo -n (sin password) disponible en el nodo remoto.
set -euo pipefail

NODE="${1:?uso: deploy_agent.sh <node> <ssh_host> <role> [arch]}"
HOST="${2:?uso: deploy_agent.sh <node> <ssh_host> <role> [arch]}"
ROLE="${3:?uso: deploy_agent.sh <node> <ssh_host> <role> [arch]}"
ARCH="${4:-amd64}"

HUB="https://metrics-dxaqj3ina6eqd5pjt85wkrrj.organic-machine.com/api/v1/import/prometheus"
LOKI="https://logs-wmaxecsjcfnocz81d5luca92.organic-machine.com/loki/api/v1/push"
PW="$(pass show fleet/ingest-pass | head -1)"
BIN="$(cd "$(dirname "$0")/.." && pwd)/apps/metrics_agent/dist/metrics_agent_${ARCH}"

[ -f "$BIN" ] || { echo "ERROR: falta el binario $BIN (compílalo primero)"; exit 1; }

echo ">> copiando binario a $HOST"
scp -q -o BatchMode=yes "$BIN" "$HOST:/tmp/metrics_agent"

echo ">> instalando servicio en $NODE ($HOST)"
ssh -o BatchMode=yes "$HOST" "NODE='$NODE' PW='$PW' HUB='$HUB' LOKI='$LOKI' ROLE='$ROLE' bash -s" <<'OUTER'
set -e
sudo -n mkdir -p /opt/fleet-agent /etc/fleet-agent
sudo -n mv /tmp/metrics_agent /opt/fleet-agent/metrics_agent
sudo -n chmod 755 /opt/fleet-agent/metrics_agent
sudo -n tee /etc/fleet-agent/agent.json >/dev/null <<JSON
{
  "node": "${NODE}",
  "hub_url": "${HUB}",
  "loki_url": "${LOKI}",
  "user": "fleet",
  "pass": "${PW}",
  "interval_sec": 15,
  "labels": { "role": "${ROLE}" }
}
JSON
sudo -n chmod 600 /etc/fleet-agent/agent.json
sudo -n tee /etc/systemd/system/fleet-agent.service >/dev/null <<'UNIT'
[Unit]
Description=Fleet metrics agent (fleet_monitoring)
After=network-online.target
Wants=network-online.target

[Service]
Type=simple
ExecStart=/opt/fleet-agent/metrics_agent -config /etc/fleet-agent/agent.json
Restart=always
RestartSec=10
NoNewPrivileges=true

[Install]
WantedBy=multi-user.target
UNIT
sudo -n systemctl daemon-reload
sudo -n systemctl enable fleet-agent >/dev/null 2>&1
sudo -n systemctl restart fleet-agent
sleep 3
echo -n "status: "; systemctl is-active fleet-agent
OUTER

echo ">> $NODE desplegado"