name: build
on:
  push:
    branches: [main]          # ← PODMIEŃ na swoją gałąź
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 2

      - name: Login do rejestru
        run: echo "${{ secrets.REGISTRY_TOKEN }}" | docker login gitea.czernobog.pl -u gitea --password-stdin

      # Lekkie obrazy k3s-owe — budowane zawsze
      - name: Build k3s images (librarian, bot)
        run: |
          TAG=${GITHUB_SHA::8}
          docker build -f docker/Dockerfile.librarian -t gitea.czernobog.pl/gitea/conjurer-librarian:$TAG .
          docker push  gitea.czernobog.pl/gitea/conjurer-librarian:$TAG
          docker build -f docker/Dockerfile.bot       -t gitea.czernobog.pl/gitea/conjurer-bot:$TAG .
          docker push  gitea.czernobog.pl/gitea/conjurer-bot:$TAG

      # DEPLOY channel: the production (deploy) bot tracks a SEPARATE image,
      # conjurer-bot-deploy, which only gets a new tag when the commit message
      # contains the trigger "[deploy]". So the test bot & librarian update on
      # every build, but the deploy bot only on commits you explicitly promote.
      # Same bytes as conjurer-bot:$TAG - just re-tagged, no rebuild.
      - name: Promote bot to deploy channel (only on [deploy] in commit message)
        run: |
          TAG=${GITHUB_SHA::8}
          MSG="$(git log -1 --pretty=%B)"
          if echo "$MSG" | grep -qiF '[deploy]'; then
            echo "Commit message contains [deploy] -> promoting conjurer-bot-deploy:$TAG"
            docker tag  gitea.czernobog.pl/gitea/conjurer-bot:$TAG gitea.czernobog.pl/gitea/conjurer-bot-deploy:$TAG
            docker push gitea.czernobog.pl/gitea/conjurer-bot-deploy:$TAG
          else
            echo "No [deploy] trigger in commit message -> deploy bot image left unchanged"
          fi

      # Docker-owe: musician i share lekkie, radio CIĘŻKIE (opam+OCaml+liquidsoap)
      - name: Build docker-stack images (musician, share)
        run: |
          TAG=${GITHUB_SHA::8}
          docker build -f docker/Dockerfile.musician -t gitea.czernobog.pl/gitea/conjurer-musician:$TAG .
          docker push  gitea.czernobog.pl/gitea/conjurer-musician:$TAG
          docker build -f docker/Dockerfile.share    -t gitea.czernobog.pl/gitea/conjurer-share:$TAG .
          docker push  gitea.czernobog.pl/gitea/conjurer-share:$TAG

      # RADIO: budowane TYLKO gdy zmieniło się coś istotnego (oszczędza ~15 min na push)


      - name: Czy radio wymaga rebuildu?
        id: radio_changed
        env:
          REGISTRY_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
        run: |
          NEED=no

          # Warunek 1: zmiany w plikach radia
          if git rev-parse HEAD~1 >/dev/null 2>&1; then BASE=HEAD~1; else BASE=$(git hash-object -t tree /dev/null); fi
          if git diff --name-only "$BASE" HEAD | grep -qE "docker/Dockerfile.radio|docker/entrypoint.radio.sh|docker/icecast.xml.tpl|docker/pulse-system.pa|conjurer_musician/radio_conjurer.liq|conjurer_betoniarka/"; then
            NEED=yes
            echo "radio: wykryto zmiany w plikach → build"
          fi

          # Warunek 2: obrazu nie ma w rejestrze (inicjalizacja)
          if [ "$NEED" = "no" ]; then
            TAGS=$(curl -s -u "gitea:${REGISTRY_TOKEN}" \
              "https://gitea.czernobog.pl/v2/gitea/conjurer-radio/tags/list" 2>/dev/null || true)
            # brak tagów w ogóle = obraz nie istnieje → zbuduj
            if ! echo "$TAGS" | grep -q '"tags"[[:space:]]*:[[:space:]]*\['; then
              NEED=yes
              echo "radio: brak obrazu w rejestrze → build inicjalizujący"
            elif echo "$TAGS" | grep -qE '"tags"[[:space:]]*:[[:space:]]*\[[[:space:]]*\]|"tags"[[:space:]]*:[[:space:]]*null'; then
              NEED=yes
              echo "radio: obraz istnieje ale bez tagów → build"
            fi
          fi

          echo "build=$NEED" >> $GITHUB_OUTPUT
          [ "$NEED" = "no" ] && echo "radio bez zmian i obraz istnieje — pomijam ciężki build" || true

      - name: Build radio
        if: steps.radio_changed.outputs.build == 'yes'
        run: |
          TAG=${GITHUB_SHA::8}
          docker build -f docker/Dockerfile.radio -t gitea.czernobog.pl/gitea/conjurer-radio:$TAG .
          docker push  gitea.czernobog.pl/gitea/conjurer-radio:$TAG

      - name: Podsumowanie
        run: echo "Zbudowano tag ${GITHUB_SHA::8}"