name: Daily .NET Version Check

on:
  schedule:
    - cron: "0 8 * * *"
  workflow_dispatch:

env:
  DOCKER_IMAGE: docker.io/svrnty/dotnet
  RELEASES_INDEX_URL: https://dotnetcli.azureedge.net/dotnet/release-metadata/releases-index.json

jobs:
  check-versions:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Log in to DockerHub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_SVRNTY_USERNAME }}
          password: ${{ secrets.DOCKERHUB_SVRNTY_ACCESS_TOKEN }}

      - name: Check for new .NET versions
        id: check
        run: |
          set -euo pipefail

          # Fetch release metadata
          RELEASES=$(curl -fsSL "$RELEASES_INDEX_URL")

          # Filter active/go-live versions (excludes EOL automatically)
          SUPPORTED=$(echo "$RELEASES" | jq -c '[.["releases-index"][] | select(.["support-phase"] == "active" or .["support-phase"] == "go-live")]')

          NEEDS_BUILD=false

          echo "$SUPPORTED" | jq -r '.[] | "\(.["channel-version"]) \(.["latest-runtime"]) \(.["latest-sdk"]) \(.["release-type"])"' | \
          while read -r CHANNEL RUNTIME SDK TYPE; do
            MAJOR=$(echo "$CHANNEL" | cut -d. -f1)
            echo "Checking .NET $MAJOR: runtime=$RUNTIME sdk=$SDK type=$TYPE"

            # Check if runtime image for this exact version exists
            if docker manifest inspect "$DOCKER_IMAGE:runtime-$RUNTIME" > /dev/null 2>&1; then
              echo "  Image runtime-$RUNTIME already exists, skipping"
            else
              echo "  New version detected: runtime-$RUNTIME"
              NEEDS_BUILD=true
            fi
          done

          # Re-check outside the pipe (subshell issue)
          NEEDS_BUILD=false
          while read -r CHANNEL RUNTIME SDK TYPE; do
            MAJOR=$(echo "$CHANNEL" | cut -d. -f1)
            if ! docker manifest inspect "$DOCKER_IMAGE:runtime-$RUNTIME" > /dev/null 2>&1; then
              NEEDS_BUILD=true
              break
            fi
          done < <(echo "$SUPPORTED" | jq -r '.[] | "\(.["channel-version"]) \(.["latest-runtime"]) \(.["latest-sdk"]) \(.["release-type"])"')

          echo "needs_build=$NEEDS_BUILD" >> $GITHUB_OUTPUT

      - name: Trigger build workflow
        if: steps.check.outputs.needs_build == 'true'
        uses: actions/github-script@v7
        with:
          script: |
            await github.rest.actions.createWorkflowDispatch({
              owner: context.repo.owner,
              repo: context.repo.repo,
              workflow_id: 'build.yaml',
              ref: context.ref
            })