name: Bundle Stats
on:
  workflow_call:
    inputs:
      mode:
        required: true
        type: string
        description: "'store' or 'compare'"
      branch:
        required: true
        type: string
    outputs:
      stats:
        description: "Bundle stats comparison"
        value: ${{ jobs.bundle-stats.outputs.stats }}

jobs:
  bundle-stats:
    runs-on: ubuntu-latest
    outputs:
      stats: ${{ steps.gist-ops.outputs.stats }}
    steps:
      - uses: actions/github-script@v6
        id: gist-ops
        with:
          script: |
            const gistId = '${{ secrets.BUNDLE_STATS_GIST_ID }}';

            async function getGistContent() {
              const { data } = await github.rest.gists.get({ gist_id: gistId });
              return JSON.parse(data.files['bundle-stats.json'].content || '{}');
            }

            async function updateGistContent(content) {
              await github.rest.gists.update({
                gist_id: gistId,
                files: {
                  'bundle-stats.json': {
                    content: JSON.stringify(content, null, 2)
                  }
                }
              });
            }

            if ('${{ inputs.mode }}' === 'store') {
              const stats = require('/tmp/bundle-stats.json');
              const content = await getGistContent();
              content['${{ inputs.branch }}'] = stats;
              await updateGistContent(content);
            } else {
              const content = await getGistContent();
              const baseStats = content['${{ inputs.branch }}'];
              const newStats = require('/tmp/bundle-stats.json');

              const comparison = `minecraft.html (normal build gzip)\n${baseStats.total}MB (${baseStats.gzipped}MB compressed) -> ${newStats.total}MB (${newStats.gzipped}MB compressed)`;
              core.setOutput('stats', comparison);
            }