name: Deploy on push

on:
  push:
    branches: ["main"]

jobs:
  detect:
    runs-on: docker2
    outputs:
      swarm_files: ${{ steps.changes.outputs.swarm_files }}
      compose_files_matrix: ${{ steps.changes.outputs.compose_files_matrix }}
    steps:
      - name: Checkout
        uses: https://data.forgejo.org/actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Detect changed YAML deploy targets (your naming)
        id: changes
        shell: bash
        run: |
          set -euo pipefail

          BASE="${{ github.event.before }}"
          HEAD="${{ github.sha }}"

          if [ -z "${BASE}" ] || [ "${BASE}" = "0000000000000000000000000000000000000000" ]; then
            BASE="$(git rev-parse "${HEAD}~1" || true)"
          fi
          if [ -z "${BASE}" ]; then
            echo "No base commit found; deploying nothing."
            echo "swarm_files=" >> "$GITHUB_OUTPUT"
            echo 'compose_files_matrix={"include":[]}' >> "$GITHUB_OUTPUT"
            exit 0
          fi

          CHANGED="$(git diff --name-only "$BASE" "$HEAD" || true)"
          echo "$CHANGED"

          # Swarm: only changed stack YAMLs
          SWARM_FILES="$(echo "$CHANGED" | grep -E '^services/swarm/stacks/.*\.ya?ml$' || true)"
          SWARM_FILES_ONE_LINE="$(echo "$SWARM_FILES" | tr '\n' ' ' | xargs || true)"
          echo "swarm_files=$SWARM_FILES_ONE_LINE" >> "$GITHUB_OUTPUT"

          # Compose: any changed YAML under services/compose/<host>/<service>/
          COMPOSE_FILES="$(
            echo "$CHANGED" \
              | grep -E '^services/compose/[^/]+/[^/]+/.*\.ya?ml$' \
              | sort -u \
              || true
          )"

          # Build matrix items: {"host":"nas","file":"services/compose/nas/foo/foo.yaml"}
          JSON='{"include":['
          FIRST=1
          while read -r F; do
            [ -z "$F" ] && continue
            HOST="$(echo "$F" | awk -F/ '{print $3}')"
            if [ $FIRST -eq 1 ]; then
              FIRST=0
            else
              JSON+=","
            fi
            JSON+="{\"host\":\"$HOST\",\"file\":\"$F\"}"
          done <<< "$COMPOSE_FILES"
          JSON+=']}'

          echo "compose_files_matrix=$JSON" >> "$GITHUB_OUTPUT"

  deploy_swarm:
    needs: detect
    if: ${{ needs.detect.outputs.swarm_files != '' }}
    runs-on: docker2
    steps:
      - name: Checkout
        uses: https://data.forgejo.org/actions/checkout@v4

      - name: Pre-flight validate swarm stacks
        shell: bash
        run: |
          set -euo pipefail
          for f in ${{ needs.detect.outputs.swarm_files }}; do
            echo "Validating swarm stack file: $f"
            docker stack config -c "$f" > /dev/null
          done

      - name: Deploy changed swarm stacks
        shell: bash
        run: |
          set -euo pipefail
          for f in ${{ needs.detect.outputs.swarm_files }}; do
            echo "Deploying swarm stack file: $f"
            STACK="$(basename "$f")"
            STACK="${STACK%.yml}"
            STACK="${STACK%.yaml}"
            docker stack deploy -c "$f" "$STACK"
          done

  deploy_compose:
    needs: detect
    if: ${{ needs.detect.outputs.compose_files_matrix != '' }}
    strategy:
      fail-fast: false
      matrix: ${{ fromJSON(needs.detect.outputs.compose_files_matrix) }}
    runs-on: docker
    steps:
      - name: Checkout
        uses: https://data.forgejo.org/actions/checkout@v4

      - name: Ensure we are on the right host
        shell: bash
        run: |
          set -euo pipefail
          WANT="${{ matrix.host }}"
          HAVE="$(hostname)"
          echo "Want host: $WANT"
          echo "Have host: $HAVE"
          if [ "$WANT" != "$HAVE" ]; then
            echo "This runner is on $HAVE but job wants $WANT. Failing to avoid deploying on wrong host."
            exit 1
          fi

      - name: Pre-flight validate compose file
        shell: bash
        run: |
          set -euo pipefail
          F="${{ matrix.file }}"
          echo "Validating compose file: $F"
          docker compose -f "$F" config -q

      - name: Deploy compose file
        shell: bash
        run: |
          set -euo pipefail
          F="${{ matrix.file }}"
          echo "Deploying compose file: $F"
          docker compose -f "$F" pull
          docker compose -f "$F" up -d --remove-orphans