name: vociferate/coverage-badge
description: >
  Generate coverage report artefacts, publish them to object storage,
  and expose report URLs for workflow summaries.

inputs:
  coverage-profile:
    description: Path to the Go coverage profile file.
    required: false
    default: coverage.out
  coverage-html:
    description: Output path for the rendered HTML coverage report.
    required: false
    default: coverage.html
  coverage-badge:
    description: Output path for the generated SVG badge.
    required: false
    default: coverage-badge.svg
  coverage-summary:
    description: Output path for the generated coverage summary JSON.
    required: false
    default: coverage-summary.json
  artefact-bucket-name:
    description: S3 bucket name for published coverage artefacts.
    required: true
  artefact-bucket-endpoint:
    description: Endpoint URL used for S3-compatible uploads.
    required: true
  branch-name:
    description: Branch name used in the publication path.
    required: false
    default: ''
  repository-name:
    description: Repository name used in the publication path.
    required: false
    default: ''
  summary-file:
    description: Optional file path to append markdown summary output.
    required: false
    default: ''

outputs:
  total:
    description: Computed coverage percentage.
    value: ${{ steps.generate.outputs.total }}
  report-url:
    description: Browser-facing URL for the published coverage report.
    value: ${{ steps.upload.outputs.report_url }}
  badge-url:
    description: Browser-facing URL for the published coverage badge.
    value: ${{ steps.upload.outputs.badge_url }}

runs:
  using: composite
  steps:
    - name: Install AWS CLI v2
      uses: ankurk91/install-aws-cli-action@v1

    - name: Verify AWS CLI
      shell: bash
      run: aws --version

    - name: Generate coverage artefacts
      id: generate
      shell: bash
      env:
        COVERAGE_PROFILE: ${{ inputs.coverage-profile }}
        COVERAGE_HTML: ${{ inputs.coverage-html }}
        COVERAGE_BADGE: ${{ inputs.coverage-badge }}
        COVERAGE_SUMMARY: ${{ inputs.coverage-summary }}
      run: |
        set -euo pipefail

        go tool cover -html="$COVERAGE_PROFILE" -o "$COVERAGE_HTML"

        total="$(go tool cover -func="$COVERAGE_PROFILE" | awk '/^total:/ {sub(/%/, "", $3); print $3}')"
        printf '{\n  "total": "%s"\n}\n' "$total" > "$COVERAGE_SUMMARY"
        printf 'total=%s\n' "$total" >> "$GITHUB_OUTPUT"

        color="$(awk -v total="$total" 'BEGIN {
          if (total >= 80) print "brightgreen";
          else if (total >= 70) print "green";
          else if (total >= 60) print "yellowgreen";
          else if (total >= 50) print "yellow";
          else print "red";
        }')"

        cat > "$COVERAGE_BADGE" <<EOF
        <svg xmlns="http://www.w3.org/2000/svg" width="126" height="20" role="img" aria-label="coverage: ${total}%">
          <linearGradient id="smooth" x2="0" y2="100%">
            <stop offset="0" stop-color="#bbb" stop-opacity=".1"/>
            <stop offset="1" stop-opacity=".1"/>
          </linearGradient>
          <clipPath id="round">
            <rect width="126" height="20" rx="3" fill="#fff"/>
          </clipPath>
          <g clip-path="url(#round)">
            <rect width="63" height="20" fill="#555"/>
            <rect x="63" width="63" height="20" fill="${color}"/>
            <rect width="126" height="20" fill="url(#smooth)"/>
          </g>
          <g fill="#fff" text-anchor="middle" font-family="Verdana,Geneva,DejaVu Sans,sans-serif" font-size="11">
            <text x="32.5" y="15" fill="#010101" fill-opacity=".3">coverage</text>
            <text x="32.5" y="14">coverage</text>
            <text x="93.5" y="15" fill="#010101" fill-opacity=".3">${total}%</text>
            <text x="93.5" y="14">${total}%</text>
          </g>
        </svg>
        EOF

    - name: Upload coverage artefacts
      id: upload
      shell: bash
      env:
        ARTEFACT_BUCKET_NAME: ${{ inputs.artefact-bucket-name }}
        ARTEFACT_BUCKET_ENDPONT: ${{ inputs.artefact-bucket-endpoint }}
        INPUT_BRANCH_NAME: ${{ inputs.branch-name }}
        INPUT_REPOSITORY_NAME: ${{ inputs.repository-name }}
        COVERAGE_HTML: ${{ inputs.coverage-html }}
        COVERAGE_BADGE: ${{ inputs.coverage-badge }}
        COVERAGE_SUMMARY: ${{ inputs.coverage-summary }}
      run: |
        set -euo pipefail

        aws configure set default.s3.addressing_style path

        branch_name="$(printf '%s' "$INPUT_BRANCH_NAME" | sed 's/^[[:space:]]\+//; s/[[:space:]]\+$//')"
        if [[ -z "$branch_name" ]]; then
          branch_name="${GITHUB_REF_NAME}"
        fi

        repo_name="$(printf '%s' "$INPUT_REPOSITORY_NAME" | sed 's/^[[:space:]]\+//; s/[[:space:]]\+$//')"
        if [[ -z "$repo_name" ]]; then
          repo_name="${GITHUB_REPOSITORY##*/}"
        fi

        prefix="${repo_name}/branch/${branch_name}"

        display_endpoint="${ARTEFACT_BUCKET_ENDPONT#https://}"
        display_endpoint="${display_endpoint#http://}"
        report_url="//${display_endpoint%/}/${ARTEFACT_BUCKET_NAME}/${prefix}/coverage.html"
        badge_url="//${display_endpoint%/}/${ARTEFACT_BUCKET_NAME}/${prefix}/coverage-badge.svg"

        aws --endpoint-url "${ARTEFACT_BUCKET_ENDPONT}" s3 cp "$COVERAGE_HTML" "s3://${ARTEFACT_BUCKET_NAME}/${prefix}/coverage.html" --content-type text/html
        aws --endpoint-url "${ARTEFACT_BUCKET_ENDPONT}" s3 cp "$COVERAGE_BADGE" "s3://${ARTEFACT_BUCKET_NAME}/${prefix}/coverage-badge.svg" --content-type image/svg+xml
        aws --endpoint-url "${ARTEFACT_BUCKET_ENDPONT}" s3 cp "$COVERAGE_SUMMARY" "s3://${ARTEFACT_BUCKET_NAME}/${prefix}/coverage-summary.json" --content-type application/json

        printf 'report_url=%s\n' "$report_url" >> "$GITHUB_OUTPUT"
        printf 'badge_url=%s\n' "$badge_url" >> "$GITHUB_OUTPUT"

    - name: Append coverage summary
      if: ${{ inputs.summary-file != '' }}
      shell: bash
      env:
        SUMMARY_FILE: ${{ inputs.summary-file }}
        TOTAL: ${{ steps.generate.outputs.total }}
        REPORT_URL: ${{ steps.upload.outputs.report_url }}
        BADGE_URL: ${{ steps.upload.outputs.badge_url }}
      run: |
        set -euo pipefail

        {
          echo '## Coverage'
          echo
          echo "- Total: \`${TOTAL}%\`"
          echo "- Report: ${REPORT_URL}"
          echo "- Badge: ${BADGE_URL}"
        } >> "$SUMMARY_FILE"