name: Repo Charts

on:
  workflow_dispatch:
  schedule:
    - cron: "37 6 * * *"
  push:
    branches: [main]
    paths:
      - ".github/workflows/repo-charts.yml"
      - "scripts/star-history/**"
      - "scripts/crowdin-stats/**"

permissions: {}

concurrency:
  group: repo-charts
  cancel-in-progress: false

env:
  CHARTS_BRANCH: generated-charts

jobs:
  publish:
    name: Refresh charts
    if: github.repository == 'bookorbit/bookorbit'
    runs-on: ubuntu-latest
    timeout-minutes: 15
    permissions:
      contents: write

    steps:
      - name: Checkout
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1

      - name: Set up Node.js
        uses: actions/setup-node@949feb2413d6458794dcd2491c4babbbce0c15c1 # v7.1.0
        with:
          node-version: 26

      - name: Test generators
        run: node --test scripts/star-history/generate.test.mjs scripts/crowdin-stats/generate.test.mjs

      - name: Restore published charts
        env:
          SERIES_PATH: ${{ runner.temp }}/star-history.json
        run: |
          restore_series() {
            for branch in "$CHARTS_BRANCH" star-history; do
              if git ls-remote --exit-code --heads origin "$branch" >/dev/null &&
                git fetch --depth 1 origin "+refs/heads/$branch:refs/remotes/origin/$branch" &&
                git show "origin/$branch:star-history.json" > "$SERIES_PATH" 2>/dev/null; then
                echo "Restored star history series from $branch"
                return 0
              fi
            done

            echo "No published series found, using the bootstrap snapshot"
            cp scripts/star-history/bootstrap.json "$SERIES_PATH"
          }

          restore_series

      - name: Generate star history chart
        id: star-history
        continue-on-error: true
        env:
          GITHUB_TOKEN: ${{ github.token }}
          STAR_HISTORY_TOKEN: ${{ secrets.STAR_HISTORY_TOKEN }}
          SERIES_PATH: ${{ runner.temp }}/star-history.json
          SVG_PATH: ${{ runner.temp }}/star-history.svg
        run: |
          node scripts/star-history/generate.mjs \
            --repo "$GITHUB_REPOSITORY" \
            --series "$SERIES_PATH" \
            --bootstrap scripts/star-history/bootstrap.json \
            --out "$SVG_PATH"

      - name: Generate translation progress chart
        id: translation-progress
        continue-on-error: true
        env:
          CROWDIN_TOKEN: ${{ secrets.CROWDIN_TOKEN }}
          SVG_PATH: ${{ runner.temp }}/translation-progress.svg
        run: |
          node scripts/crowdin-stats/generate.mjs --out "$SVG_PATH"

      - name: Publish charts
        env:
          SERIES_PATH: ${{ runner.temp }}/star-history.json
          STAR_SVG_PATH: ${{ runner.temp }}/star-history.svg
          TRANSLATION_SVG_PATH: ${{ runner.temp }}/translation-progress.svg
          GIT_INDEX_FILE: ${{ runner.temp }}/charts.index
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"

          parent=$(git rev-parse --verify "refs/remotes/origin/$CHARTS_BRANCH" 2>/dev/null || true)

          rm -f "$GIT_INDEX_FILE"
          if [ -n "$parent" ]; then
            git read-tree "$parent"
          fi

          stage_chart() {
            if [ ! -s "$2" ]; then
              echo "Skipping $1, keeping the published copy"
              return 0
            fi
            blob=$(git hash-object -w "$2")
            git update-index --add --cacheinfo "100644,$blob,$1"
          }

          stage_chart star-history.svg "$STAR_SVG_PATH"
          stage_chart star-history.json "$SERIES_PATH"
          stage_chart translation-progress.svg "$TRANSLATION_SVG_PATH"

          tree=$(git write-tree)

          if [ -n "$parent" ]; then
            if [ "$tree" = "$(git rev-parse "$parent^{tree}")" ]; then
              echo "Charts are unchanged"
              exit 0
            fi
            commit=$(printf '%s\n' "chore: update repository charts" | \
              TZ=UTC git commit-tree "$tree" -p "$parent")
          else
            commit=$(printf '%s\n' "chore: initialize repository charts" | \
              TZ=UTC git commit-tree "$tree")
          fi

          git push origin "$commit:refs/heads/$CHARTS_BRANCH"

      - name: Fail on generator errors
        if: steps.star-history.outcome == 'failure' || steps.translation-progress.outcome == 'failure'
        env:
          STAR_OUTCOME: ${{ steps.star-history.outcome }}
          TRANSLATION_OUTCOME: ${{ steps.translation-progress.outcome }}
        run: |
          echo "star history: $STAR_OUTCOME"
          echo "translation progress: $TRANSLATION_OUTCOME"
          exit 1