#!/bin/bash
set -euo pipefail

# Version et URLs
LOKI_VER="2.9.0"
PROMTAIL_VER="2.9.0"
LOKI_URL="https://github.com/grafana/loki/releases/download/v${LOKI_VER}/loki-linux-amd64.zip"
PROMTAIL_URL="https://github.com/grafana/loki/releases/download/v${PROMTAIL_VER}/promtail-linux-amd64.zip"

# Détection Distro et dépendances
if [ -f /etc/os-release ]; then
  . /etc/os-release
fi
OS_ID=${ID:-debian}

sudo apt-get update
sudo apt-get install -y curl unzip

# Installer Loki
sudo mkdir -p /usr/local/bin /etc/loki /var/lib/loki
sudo curl -L -o /tmp/loki-linux-amd64.zip "$LOKI_URL"
sudo unzip -o /tmp/loki-linux-amd64.zip -d /usr/local/bin
sudo bash -lc 'cat > /etc/systemd/system/loki.service <<EOF
[Unit]
Description=Loki service
After=network-online.target
Wants=network-online.target

[Service]
ExecStart=/usr/local/bin/loki-linux-amd64 -config.file=/etc/loki/local-config.yaml
Restart=always
User=root
Group=root

[Install]
WantedBy=multi-user.target
EOF'

sudo mkdir -p /etc/loki /var/lib/loki
sudo tee /etc/loki/local-config.yaml >/dev/null << 'EOF'
auth_enabled: false
server:
  http_listen_port: 3100
  grpc_listen_port: 9095
ingester:
  wal:
    enabled: true
storage_config:
  boltdb:
    directory: /var/lib/loki/chunks
limits_config:
  enforce_metric_name: false
EOF

sudo systemctl daemon-reload
sudo systemctl enable loki
sudo systemctl start loki

# Installer Promtail
sudo mkdir -p /usr/local/bin /etc/promtail /var/log/promtail
sudo curl -L -o /tmp/promtail-linux-amd64.zip "$PROMTAIL_URL"
sudo unzip -o /tmp/promtail-linux-amd64.zip -d /usr/local/bin
sudo bash -lc 'cat > /etc/systemd/system/promtail.service <<EOF
[Unit]
Description=Promtail service
After=network-online.target
Wants=network-online.target

[Service]
ExecStart=/usr/local/bin/promtail-linux-amd64 -config.file=/etc/promtail/promtail.yaml
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF'

sudo mkdir -p /etc/promtail
sudo tee /etc/promtail/promtail.yaml >/dev/null << 'EOF'
server:
  http_listen_port: 9080
positions:
  filename: /var/log/promtail/positions.yaml
clients:
  - url: http://localhost:3100/loki/api/v1/push
scrape_configs:
  - job: grafana-logs
    static_configs:
      - targets: [localhost]
        labels:
          __path__: /home/debian/code/logs/*.log
          job: logs
  - job: coffre-logs
    static_configs:
      - targets: [localhost]
        labels:
          __path__: /home/debian/code/4NK_dev/4NK_node/log/*.log
          job: coffre_logs
EOF

sudo systemctl daemon-reload
sudo systemctl enable promtail
sudo systemctl start promtail

# Vérifications simples
echo
echo "Grafana Loki Promtail local install terminé. Vérifications:"
echo " - Grafana: http://localhost:3000"
echo " - Loki: http://localhost:3100"
echo " - Promtail: service actif (Promtail)"