name: Demo

on:
  push:
    branches: [main]
    paths-ignore:
      - "demo/**"
      - "**.md"
      - "LICENSE"
  workflow_dispatch:

permissions:
  contents: write

concurrency:
  group: demo
  cancel-in-progress: true

jobs:
  generate:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6

      - uses: actions/setup-go@v6
        with:
          go-version: "1.26"
          cache: true

      - name: Build ghstats
        run: go build -trimpath -ldflags="-s -w" -o ghstats .

      - name: Render every card for every theme
        env:
          GITHUB_TOKEN: ${{ secrets.GHSTATS_TOKEN }}
        run: |
          rm -rf demo
          mkdir -p demo
          ./ghstats \
            -user "${{ github.repository_owner }}" \
            -themes all \
            -tz Asia/Saigon \
            -out demo

      - name: Write demo READMEs (index + per-theme)
        env:
          OWNER: ${{ github.repository_owner }}
          REPO: ${{ github.repository }}
        run: |
          themes=$(./ghstats -list-themes)

          # Lightweight index so readers don't have to load ~975 images at once.
          {
            echo "# ghstats demo gallery"
            echo
            echo "Every card rendered for [\`$OWNER\`](https://github.com/$OWNER) in every supported theme. Click a theme to open its gallery page — each page embeds 15 SVGs, so only the theme you're reviewing is fetched."
            echo
            echo "Auto-generated by [\`.github/workflows/demo.yml\`](../.github/workflows/demo.yml) on each push to \`main\`. Do not edit by hand."
            echo
            echo "## Themes"
            echo
            for theme in $themes; do
              dir="demo/$theme"
              [ -d "$dir" ] || continue
              echo "- [\`$theme\`](./$theme/README.md)"
            done
          } > demo/README.md

          # Per-theme page groups singletons at top, then compares last-year
          # vs all-time variants side-by-side so the reader can eyeball the
          # evolution of each metric without scrolling.
          for theme in $themes; do
            dir="demo/$theme"
            [ -d "$dir" ] || continue
            out="$dir/README.md"
            pair() {
              local heading="$1" left="$2" right="$3"
              [ -f "$dir/$left.svg" ] && [ -f "$dir/$right.svg" ] || return
              printf '### %s\n\n' "$heading"
              printf '<table><tr><th>Last year</th><th>All time</th></tr><tr>\n'
              printf '<td><img src="./%s.svg" alt="%s" /></td>\n' "$left" "$left"
              printf '<td><img src="./%s.svg" alt="%s" /></td>\n' "$right" "$right"
              printf '</tr></table>\n\n'
            }
            single() {
              local heading="$1" name="$2"
              [ -f "$dir/$name.svg" ] || return
              printf '### %s\n\n![%s](./%s.svg)\n\n' "$heading" "$name" "$name"
            }
            {
              printf '# ghstats — %s\n\n' "$theme"
              printf '[← back to index](../README.md)\n\n'
              printf 'Rendered for [`%s`](https://github.com/%s). 15 SVGs below, ' "$OWNER" "$OWNER"
              printf 'grouped so the last-year / all-time pairs sit next to each other.\n\n'
              printf '## At-a-glance\n\n'
              single "Profile" profile-details
              single "Stats"   stats
              single "Streak"  streak

              printf '## Repos\n\n'
              single "Top starred"     top-starred-repos
              single "Repos per language" repos-per-language

              printf '## Contributions — time series\n\n'
              single "Calendar heatmap (last year)" contributions-heatmap
              single "By year (all time)"           contributions-by-year
              pair   "Monthly shape"  contributions            contributions-all-time

              printf '## When you commit\n\n'
              pair "By hour of day" productive-time    productive-time-all-time
              pair "By day of week" productive-weekday productive-weekday-all-time

              printf '## What you commit in\n\n'
              pair "Byte-weighted language share" most-commit-language most-commit-language-all-time
            } > "$out"
          done

      - name: Commit demo back to main
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git add demo
          if git diff --cached --quiet; then
            echo "No demo changes to commit."
            exit 0
          fi
          git commit -m "chore(demo): regenerate gallery"
          git push origin HEAD:${{ github.ref_name }}