create-preview-link.yml

name: Build Transcripts Preview Site
permissions:
  contents: read
  pull-requests: write
  issues: write
on:
  pull_request_target:
    paths:
      - '**' 
  workflow_dispatch:
  issue_comment:
    types: [created]
    
jobs:
  build-preview:
    runs-on: ubuntu-latest
    
    environment: ${{ (github.event_name == 'pull_request_target' && github.event.pull_request.head.repo.full_name != github.repository) && 'external-fork-preview' || '' }}


    steps:
      - name: Get PR details for comment trigger
        id: pr-details
        if: github.event_name == 'issue_comment'
        uses: actions/github-script@v7
        with:
          result-encoding: string
          script: |
            const pr = await github.rest.pulls.get({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.issue.number
            });
            return JSON.stringify({
              head_sha: pr.data.head.sha,
              head_ref: pr.data.head.ref,
              head_repo_fullname: pr.data.head.repo.full_name
            });

      - name: Setup Checkout for Bitcoin Transcripts (PR Target)
        if: github.event_name == 'pull_request_target'
        uses: actions/checkout@v4
        with:
          repository: ${{ github.event.pull_request.head.repo.full_name }}
          ref: ${{ github.event.pull_request.head.sha }}
          path: transcripts

      - name: Setup Checkout for Bitcoin Transcripts (Comment Trigger)
        if: github.event_name == 'issue_comment'
        uses: actions/checkout@v4
        with:
          repository: ${{ fromJson(steps.pr-details.outputs.result).head_repo_fullname }}
          ref: ${{ fromJson(steps.pr-details.outputs.result).head_sha }}
          path: transcripts

      - name: Setup Checkout for Bitcoin Transcripts (Workflow Dispatch)
        if: github.event_name == 'workflow_dispatch'
        uses: actions/checkout@v4
        with:
          path: transcripts
        
      - name: Setup Node.js 20
        uses: actions/setup-node@v4
        with:
          node-version: 20

      - name: Clone Registry Repo
        run: git clone https://github.com/bitcointranscripts/registry.git

      - name: Replace the public/bitcoin-transcript submodule in Registry with contents of this current branch
        working-directory: transcripts
        run: |
          rm -rf ../registry/public/bitcoin-transcript
          mkdir -p ../registry/public/bitcoin-transcript
          cp -r * ../registry/public/bitcoin-transcript/

      - name: Install dependencies
        working-directory: registry
        run: |
          npm install
        
      - name: Run Next.js build only
        working-directory: registry
        env:
            API_KEY: ${{ secrets.API_KEY }}
            CLOUD_ID: ${{ secrets.CLOUD_ID }}
            INDEX: ${{ secrets.INDEX }}
        
        run: |
          npm run fetch-topics
          npm run fetch-reviewers
          npx next build

      - name: Install Vercel CLI
        run: npm install -g vercel

      - name: Add vercel.json with custom build-only command
        working-directory: registry
        run: |
          cat <<EOF > vercel.json
          {
            "buildCommand": "npm run fetch-topics && npm run fetch-reviewers && npx next build"
          }
          EOF

      - name: Pull Vercel project settings
        working-directory: registry
        env:
          VERCEL_TOKEN: ${{ secrets.VERCEL_TOKEN }}
        run: vercel pull --yes --token=$VERCEL_TOKEN
        
      - name: Build with Vercel CLI
        working-directory: registry
        env:
          GITHUB_ACCESS_TOKEN: ${{ secrets.GH_ACCESS_TOKEN }}
          VERCEL_TOKEN: ${{ secrets.VERCEL_TOKEN }}
          API_KEY: ${{ secrets.API_KEY }}
          CLOUD_ID: ${{ secrets.CLOUD_ID }}
          INDEX: ${{ secrets.INDEX }}
        run: vercel build --token=$VERCEL_TOKEN

      - name: Deploy to Vercel  
        working-directory: registry
        env:
          VERCEL_TOKEN: ${{ secrets.VERCEL_TOKEN }}
        run: |
          vercel deploy --prebuilt --token=$VERCEL_TOKEN  --archive=tgz --yes > ../vercel-preview-url.txt       
      
      - name: Store Top-Level Folders
        working-directory: transcripts
        run: |
            git remote add upstream https://github.com/bitcointranscripts/bitcointranscripts.git
            git fetch upstream
            top_level_folders=$(git diff --name-only upstream/master)
            echo $top_level_folders > ../top_level_folders.txt
  
      - name: Comment PR with Preview URL
        uses: actions/github-script@v7
        with:
          script: |
              const fs = require('fs');
              const url = fs.readFileSync('vercel-preview-url.txt', 'utf8').trim();
              const top_level_folders = fs.readFileSync('top_level_folders.txt', 'utf8').trim();
              const dirs = top_level_folders.split(' ');
              let commentBody = `Your Transcript Preview is ready:\n`;
              if (dirs.length >= 1) {
                for (const dir of dirs) {
                  if(dir.includes(".md")) {
                    let dir_name = dir.replace(".md", "");
                    commentBody += `- [${dir_name}](${url}/${dir_name})\n`;
                  }
                }
                  commentBody += `- [View All Transcript Sources](${url}/sources)\n`;
              }
              
              const prNumber = context.issue?.number || context.payload.pull_request?.number;
       
              github.rest.issues.createComment({          
                issue_number: prNumber,
                owner: context.repo.owner,
                repo: context.repo.repo,
                body: commentBody
              });