name: CD Infra

on:
  push:
    branches: [main]
    paths:
      - "infrastructure/**"
  workflow_dispatch:
    inputs:
      restart_all:
        description: "Restart all containers (not just infra)"
        type: boolean
        default: false

concurrency:
  group: deploy-infra
  cancel-in-progress: true

jobs:
  deploy:
    name: Deploy Infrastructure
    runs-on: ubuntu-latest
    environment: infra
    steps:
      - uses: actions/checkout@v6

      - name: Decrypt secrets
        run: |
          curl -sLO https://github.com/getsops/sops/releases/download/v3.9.4/sops-v3.9.4.linux.amd64
          chmod +x sops-v3.9.4.linux.amd64
          # Merge app + infra secrets into one .env for docker-compose
          SOPS_AGE_KEY="${{ secrets.AGE_SECRET_KEY }}" ./sops-v3.9.4.linux.amd64 -d infrastructure/secrets.app.env > infrastructure/.env
          SOPS_AGE_KEY="${{ secrets.AGE_SECRET_KEY }}" ./sops-v3.9.4.linux.amd64 -d infrastructure/secrets.infra.env >> infrastructure/.env
          echo "DOMAIN=trails.cool" >> infrastructure/.env
          # Flagship marker — the Journal home renders the project
          # marketing block when this is "true" and the self-host
          # footer link when it's unset.
          echo "IS_FLAGSHIP=true" >> infrastructure/.env

      - name: Copy configs to server
        uses: appleboy/scp-action@v1
        with:
          host: ${{ secrets.DEPLOY_HOST }}
          username: root
          key: ${{ secrets.DEPLOY_SSH_KEY }}
          source: "infrastructure/docker-compose.yml,infrastructure/caddy,infrastructure/prometheus/prometheus.yml,infrastructure/loki/loki-config.yml,infrastructure/promtail/promtail-config.yml,infrastructure/postgres/queries.yml,infrastructure/postgres/init-grafana-user.sql,infrastructure/grafana/provisioning,infrastructure/grafana/dashboards"
          target: /opt/trails-cool
          strip_components: 1

      - name: Copy secrets to server
        uses: appleboy/scp-action@v1
        with:
          host: ${{ secrets.DEPLOY_HOST }}
          username: root
          key: ${{ secrets.DEPLOY_SSH_KEY }}
          source: "infrastructure/.env"
          target: /opt/trails-cool
          strip_components: 1

      - name: Deploy via SSH
        uses: appleboy/ssh-action@v1
        with:
          host: ${{ secrets.DEPLOY_HOST }}
          username: root
          key: ${{ secrets.DEPLOY_SSH_KEY }}
          script: |
            # Abort on first failure. The 2026-06-06/07 outage: a network
            # recreation stopped postgres, a later step failed, and the
            # deploy left production down for ~9h while the job's partial
            # progress looked plausible. Fail fast, verify health at the end.
            set -euo pipefail
            cd /opt/trails-cool

            # .env was placed by the SCP step (decrypted app + infra secrets)

            # Login to ghcr.io (for pulling monitoring images)
            GHCR_TOKEN=$(grep DEPLOY_GHCR_TOKEN .env | cut -d= -f2-)
            echo "$GHCR_TOKEN" | docker login ghcr.io -u stigi --password-stdin 2>/dev/null || true

            # Setup Grafana read-only DB user (idempotent)
            docker compose exec -T postgres psql -U trails -d trails -f /docker-entrypoint-initdb.d/init-grafana-user.sql 2>/dev/null || true
            GRAFANA_DB_PW=$(grep GRAFANA_DB_PASSWORD .env | cut -d= -f2-)
            if [ -n "$GRAFANA_DB_PW" ]; then
              docker compose exec -T postgres psql -U trails -d trails -c "ALTER ROLE grafana_reader PASSWORD '$GRAFANA_DB_PW'" 2>/dev/null || true
            fi

            # Capture whether prometheus was recreated. A fresh container already
            # reads the new config on startup; sending it SIGHUP immediately can
            # kill Prometheus 3.10 during early boot (exit 2 observed on
            # 2026-06-09).
            PROMETHEUS_BEFORE_ID=$(docker inspect -f '{{.Id}}' trails-cool-prometheus-1 2>/dev/null || true)

            # Full restart: gh workflow run cd-infra.yml -f restart_all=true
            if [ "${{ github.event.inputs.restart_all }}" = "true" ]; then
              docker compose --env-file .env up -d --remove-orphans
            else
              # Restart infra services (config reloads handled below).
              # --remove-orphans cleans up containers whose service was deleted
              # from the compose file (e.g., the flagship `brouter` removal in
              # PR #297 left an orphan that had to be removed by hand).
              docker compose --env-file .env up -d --remove-orphans postgres prometheus loki promtail grafana postgres-exporter node-exporter cadvisor
            fi

            PROMETHEUS_AFTER_ID=$(docker inspect -f '{{.Id}}' trails-cool-prometheus-1 2>/dev/null || true)

            # Apply config-only changes that `up -d` skips — it recreates a
            # container only when its compose *definition* changes, not when a
            # mounted config file's content changes. The configs are mounted as
            # directories (not single files), so a reload/restart re-reads the
            # freshly scp'd file; a single-file mount would have pinned the old
            # inode. Prometheus hot-reloads on SIGHUP (zero downtime) only when
            # the same container stayed up; a recreated container already loaded
            # the new config on startup. Loki and Promtail reload their main
            # config only on restart; Caddy reloads gracefully (validates, swaps
            # live, no downtime).
            if [ -n "$PROMETHEUS_BEFORE_ID" ] && [ "$PROMETHEUS_BEFORE_ID" = "$PROMETHEUS_AFTER_ID" ]; then
              docker compose --env-file .env kill -s SIGHUP prometheus
            fi
            docker compose --env-file .env restart loki promtail
            docker compose exec caddy caddy reload --config /etc/caddy/Caddyfile

            docker compose ps

            # Gate on the stack actually being up: postgres healthy, journal
            # back to healthy after the DB bounce, and Prometheus answering
            # /-/ready. A deploy that leaves any of them down must fail loudly
            # (see the 2026-06-06/07 outage, plus the 2026-06-09 Prometheus
            # startup/HUP regression).
            for ctr in trails-cool-postgres-1 trails-cool-journal-1; do
              for i in $(seq 1 36); do
                status=$(docker inspect -f '{{.State.Health.Status}}' "$ctr" 2>/dev/null || echo missing)
                [ "$status" = "healthy" ] && break
                sleep 5
              done
              if [ "$status" != "healthy" ]; then
                echo "$ctr did not become healthy (last status: $status)"
                exit 1
              fi
            done

            PROMETHEUS_READY=
            for i in $(seq 1 36); do
              prom_status=$(docker inspect -f '{{.State.Status}}' trails-cool-prometheus-1 2>/dev/null || echo missing)
              if [ "$prom_status" = "running" ]; then
                prom_ip=$(docker inspect -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' trails-cool-prometheus-1)
                if curl -sf "http://$prom_ip:9090/-/ready" >/dev/null; then
                  PROMETHEUS_READY=1
                  break
                fi
              fi
              sleep 5
            done
            if [ -z "$PROMETHEUS_READY" ]; then
              echo "trails-cool-prometheus-1 did not become ready (last status: $prom_status)"
              exit 1
            fi

            # Annotate deploy in Grafana
            GRAFANA_TOKEN=$(grep GRAFANA_SERVICE_TOKEN .env | cut -d= -f2-)
            if [ -n "$GRAFANA_TOKEN" ]; then
              docker compose exec -T grafana curl -sf -X POST \
                -H "Authorization: Bearer $GRAFANA_TOKEN" \
                -H "Content-Type: application/json" \
                -d '{"text":"Deploy infra ${{ github.sha }}","tags":["deploy","infra"]}' \
                http://localhost:3000/api/annotations || true
            fi