name: Docker Pulls History

on:
  schedule:
    - cron: "0 0 * * *" # 每天 UTC 00:00（台灣 08:00）
  workflow_dispatch:

jobs:
  track:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repo
        uses: actions/checkout@v4

      - name: Fetch Docker Hub pull count
        run: |
          set -e
          DATE=$(date -u +"%Y-%m-%d")
          PULLS=$(curl -s https://hub.docker.com/v2/repositories/convertx/convertx-cn/ | jq '.pull_count')
          echo "$DATE,$PULLS" >> metrics/docker-pulls.csv

      - name: Generate SVG chart
        run: |
          node <<'EOF'
          const fs = require('fs');

          const csv = fs.readFileSync('metrics/docker-pulls.csv', 'utf8')
            .trim()
            .split('\n')
            .slice(1);

          const dates = csv.map(r => r.split(',')[0]);
          const pulls = csv.map(r => Number(r.split(',')[1]));

          const svg = `
          <svg width="800" height="400" viewBox="0 0 800 400"
               xmlns="http://www.w3.org/2000/svg">
            <style>
              text { font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Helvetica, Arial; }
            </style>

            <rect width="100%" height="100%" fill="#ffffff"/>

            <text x="400" y="30" text-anchor="middle"
                  font-size="20" font-weight="600">
              Docker Pull History – convertx/convertx-cn
            </text>

            ${pulls.map((v, i) => {
              if (i === 0) return '';
              const x1 = 60 + (i - 1) * (680 / (pulls.length - 1));
              const y1 = 340 - (pulls[i - 1] / Math.max(...pulls)) * 260;
              const x2 = 60 + i * (680 / (pulls.length - 1));
              const y2 = 340 - (v / Math.max(...pulls)) * 260;
              return `<line x1="${x1}" y1="${y1}" x2="${x2}" y2="${y2}"
                            stroke="#2f80ed" stroke-width="2"/>`;
            }).join('')}

            <text x="60" y="360" font-size="12">${dates[0]}</text>
            <text x="740" y="360" font-size="12" text-anchor="end">${dates[dates.length - 1]}</text>

            <text x="60" y="80" font-size="12">${Math.max(...pulls).toLocaleString()}</text>
          </svg>
          `;

          fs.writeFileSync('metrics/docker-pulls-history.svg', svg);
          EOF

      - name: Commit and push
        run: |
          git config user.name "github-actions"
          git config user.email "actions@github.com"
          git add metrics
          git commit -m "chore(metrics): update docker pull history" || exit 0
          git push