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.REGISTRY_USERNAME }}
          password: ${{ secrets.REGISTRY_PASSWORD }}

      - 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")]')

          # Find highest LTS and STS majors
          LTS_MAJOR=$(echo "$SUPPORTED" | jq -r '[.[] | select(.["release-type"] == "lts")] | sort_by(.["channel-version"] | split(".") | map(tonumber)) | last | .["channel-version"] | split(".")[0]')
          STS_MAJOR=$(echo "$SUPPORTED" | jq -r '[.[] | select(.["release-type"] == "sts")] | sort_by(.["channel-version"] | split(".") | map(tonumber)) | last | .["channel-version"] | split(".")[0] // ""')

          # Export for later steps
          echo "supported=$SUPPORTED" >> $GITHUB_OUTPUT
          echo "lts_major=$LTS_MAJOR" >> $GITHUB_OUTPUT
          echo "sts_major=$STS_MAJOR" >> $GITHUB_OUTPUT

          # Check if any new images need building
          NEEDS_BUILD=false
          while read -r CHANNEL RUNTIME SDK TYPE; do
            MAJOR=$(echo "$CHANNEL" | cut -d. -f1)
            echo "Checking .NET $MAJOR: runtime=$RUNTIME sdk=$SDK type=$TYPE"

            if ! docker manifest inspect "$DOCKER_IMAGE:runtime-$RUNTIME" > /dev/null 2>&1; then
              echo "  New version detected: runtime-$RUNTIME"
              NEEDS_BUILD=true
              break
            else
              echo "  Image runtime-$RUNTIME already exists, skipping"
            fi
          done < <(echo "$SUPPORTED" | jq -r '.[] | "\(.["channel-version"]) \(.["latest-runtime"]) \(.["latest-sdk"]) \(.["release-type"])"')

          echo "needs_build=$NEEDS_BUILD" >> $GITHUB_OUTPUT

      - name: Update README version tables
        id: readme
        run: |
          set -euo pipefail

          SUPPORTED='${{ steps.check.outputs.supported }}'
          LTS_MAJOR="${{ steps.check.outputs.lts_major }}"
          STS_MAJOR="${{ steps.check.outputs.sts_major }}"

          ARCH_BADGES='<img src="https://img.shields.io/badge/amd64-E65100" alt="amd64"> <img src="https://img.shields.io/badge/arm64-2e7d32" alt="arm64">'

          # Table headers
          README_HEADER='| Version | <a href="https://hub.docker.com/r/svrnty/dotnet/tags?name=runtime-" target="_blank"><img src="https://img.shields.io/badge/runtime-blue?logo=docker" alt="runtime"></a> | <a href="https://hub.docker.com/r/svrnty/dotnet/tags?name=runtime-invariant-" target="_blank"><img src="https://img.shields.io/badge/runtime--invariant-blue?logo=docker" alt="runtime-invariant"></a> | <a href="https://hub.docker.com/r/svrnty/dotnet/tags?name=sdk-" target="_blank"><img src="https://img.shields.io/badge/sdk-blue?logo=docker" alt="sdk"></a> | Arch | EOL |'
          README_SEP='|---------|---------|-------------------|-----|------|-----|'
          DOCKERHUB_HEADER='| Version | `runtime` | `runtime-invariant` | `sdk` | Arch | EOL |'
          DOCKERHUB_SEP='|---------|-----------|---------------------|-------|------|-----|'

          echo "$README_HEADER" > /tmp/readme_rows.txt
          echo "$README_SEP" >> /tmp/readme_rows.txt
          echo "$DOCKERHUB_HEADER" > /tmp/dockerhub_rows.txt
          echo "$DOCKERHUB_SEP" >> /tmp/dockerhub_rows.txt
          > /tmp/badge_versions.txt

          # Build version rows from API data (sorted by major descending)
          echo "$SUPPORTED" | jq -r 'sort_by(.["channel-version"] | split(".") | map(tonumber)) | reverse | .[] | "\(.["channel-version"]) \(.["latest-runtime"]) \(.["latest-sdk"]) \(.["release-type"]) \(.["eol-date"] // "TBD")"' | \
          while read -r CHANNEL RUNTIME SDK TYPE EOL; do
            MAJOR=$(echo "$CHANNEL" | cut -d. -f1)

            # Version label
            if [ "$TYPE" = "lts" ]; then
              LABEL="**.NET ${MAJOR}** (LTS)"
            elif [ "$TYPE" = "sts" ]; then
              LABEL="**.NET ${MAJOR}** (STS)"
            else
              LABEL="**.NET ${MAJOR}**"
            fi

            # Floating tags only for highest LTS/STS
            if [ "$MAJOR" = "$LTS_MAJOR" ]; then
              RT_TAGS="\`runtime-${MAJOR}\` \`runtime-lts\`"
              RI_TAGS="\`runtime-invariant-${MAJOR}\` \`runtime-invariant-lts\`"
              SDK_TAGS="\`sdk-${MAJOR}\` \`sdk-lts\`"
            elif [ "$MAJOR" = "$STS_MAJOR" ]; then
              RT_TAGS="\`runtime-${MAJOR}\` \`runtime-sts\`"
              RI_TAGS="\`runtime-invariant-${MAJOR}\` \`runtime-invariant-sts\`"
              SDK_TAGS="\`sdk-${MAJOR}\` \`sdk-sts\`"
            else
              RT_TAGS="\`runtime-${MAJOR}\`"
              RI_TAGS="\`runtime-invariant-${MAJOR}\`"
              SDK_TAGS="\`sdk-${MAJOR}\`"
            fi

            echo "| ${LABEL} | ${RT_TAGS} | ${RI_TAGS} | ${SDK_TAGS} | ${ARCH_BADGES} | ${EOL} |" >> /tmp/readme_rows.txt
            echo "| ${LABEL} | ${RT_TAGS} | ${RI_TAGS} | ${SDK_TAGS} | amd64 arm64 | ${EOL} |" >> /tmp/dockerhub_rows.txt
            echo -n "${MAJOR} " >> /tmp/badge_versions.txt
          done

          README_ROWS=$(cat /tmp/readme_rows.txt)
          DOCKERHUB_ROWS=$(cat /tmp/dockerhub_rows.txt)
          BADGE_VERSIONS=$(cat /tmp/badge_versions.txt | xargs | sed 's/ /%20|%20/g')

          # Update README.md — version table
          awk '
            /<!-- BEGIN_VERSION_TABLE -->/ { print; found=1; next }
            /<!-- END_VERSION_TABLE -->/ { found=0 }
            found { next }
            { print }
          ' README.md > /tmp/readme_new.md
          # Insert new rows after BEGIN marker
          awk -v rows="$README_ROWS" '
            /<!-- BEGIN_VERSION_TABLE -->/ { print; print rows; next }
            { print }
          ' /tmp/readme_new.md > README.md

          # Update README.md — .NET badge
          sed -i "s|<!-- BEGIN_DOTNET_BADGE -->.*<!-- END_DOTNET_BADGE -->|<!-- BEGIN_DOTNET_BADGE --><a href=\"https://dotnet.microsoft.com\" target=\"_blank\"><img src=\"https://img.shields.io/badge/.NET-${BADGE_VERSIONS}-512BD4?logo=dotnet\" alt=\".NET\"></a><!-- END_DOTNET_BADGE -->|" README.md

          # Update DOCKERHUB.md — version table
          awk '
            /<!-- BEGIN_VERSION_TABLE -->/ { print; found=1; next }
            /<!-- END_VERSION_TABLE -->/ { found=0 }
            found { next }
            { print }
          ' DOCKERHUB.md > /tmp/dockerhub_new.md
          awk -v rows="$DOCKERHUB_ROWS" '
            /<!-- BEGIN_VERSION_TABLE -->/ { print; print rows; next }
            { print }
          ' /tmp/dockerhub_new.md > DOCKERHUB.md

          # Check if anything changed
          if git diff --quiet README.md DOCKERHUB.md; then
            echo "readme_changed=false" >> $GITHUB_OUTPUT
            echo "READMEs are up to date"
          else
            echo "readme_changed=true" >> $GITHUB_OUTPUT
            echo "READMEs need updating"
            git diff README.md DOCKERHUB.md
          fi

      - name: Commit README updates
        if: steps.readme.outputs.readme_changed == 'true'
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git add README.md DOCKERHUB.md
          git commit -m "Update supported .NET versions in README"
          git push

      - 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
            })