name: Update EmbedPDF Snippet

on:
  workflow_dispatch:
  schedule:
    - cron: '0 3 * * 1' # Weekly; adjust as needed

jobs:
  update-snippet:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repo
        uses: actions/checkout@v4

      - name: Read current upstream version marker
        id: current-version
        run: |
          if [ -f vendor/embedpdf/.upstream-version ]; then
            CUR=$(cat vendor/embedpdf/.upstream-version)
          else
            CUR=""
          fi
          echo "version=$CUR" >> "$GITHUB_OUTPUT"

      - name: Read latest upstream version (@embedpdf/core)
        id: upstream-version
        run: |
          LATEST=$(npm view @embedpdf/core version)
          echo "version=$LATEST" >> "$GITHUB_OUTPUT"

      - name: Should update?
        id: gate
        run: |
          if [ "${{ steps.upstream-version.outputs.version }}" = "${{ steps.current-version.outputs.version }}" ]; then
            echo "run=false" >> "$GITHUB_OUTPUT"
            echo "No upstream version change detected."
          else
            echo "run=true" >> "$GITHUB_OUTPUT"
            echo "Updating from '${{ steps.current-version.outputs.version }}' to '${{ steps.upstream-version.outputs.version }}'"
          fi

      - name: Setup Node
        if: steps.gate.outputs.run == 'true'
        uses: actions/setup-node@v4
        with:
          node-version: 20
          cache: npm

      - name: Enable corepack (pnpm)
        if: steps.gate.outputs.run == 'true'
        run: corepack enable

      - name: Prepare workspace
        if: steps.gate.outputs.run == 'true'
        run: |
          mkdir -p vendor/embedpdf
          npm config set cache ./\.npm-cache

      - name: Clone upstream embed-pdf-viewer
        if: steps.gate.outputs.run == 'true'
        run: git clone https://github.com/embedpdf/embed-pdf-viewer ../embed-pdf-viewer

      - name: Install upstream deps
        if: steps.gate.outputs.run == 'true'
        working-directory: ../embed-pdf-viewer
        run: pnpm install --frozen-lockfile

      - name: Build snippet
        if: steps.gate.outputs.run == 'true'
        working-directory: ../embed-pdf-viewer
        run: pnpm run build:snippet

      - name: Pack snippet tarball
        if: steps.gate.outputs.run == 'true'
        working-directory: ../embed-pdf-viewer
        run: |
          npm pack ./snippet --pack-destination ../bentopdf/vendor/embedpdf
          ls -l ../bentopdf/vendor/embedpdf

      - name: Sanitize tarball (rename pkg and pin deps)
        if: steps.gate.outputs.run == 'true'
        env:
          UPSTREAM_VERSION: ${{ steps.upstream-version.outputs.version }}
        run: |
          TARBALL=$(ls vendor/embedpdf/*.tgz | sort | tail -n1)
          TMP=$(mktemp -d)
          tar -xzf "$TARBALL" -C "$TMP"
          PKG="$TMP/package/package.json"
          PKG="$PKG" node - <<'NODE'
            const fs = require("fs");
            const path = process.env.PKG;
            const ver = process.env.UPSTREAM_VERSION || "1.4.1";
            const pkg = JSON.parse(fs.readFileSync(path, "utf8"));
            pkg.name = "embedpdf-snippet";
            pkg.dependencies = pkg.dependencies || {};
            for (const k of Object.keys(pkg.dependencies)) {
              if (k.startsWith("@embedpdf/")) pkg.dependencies[k] = `^${ver}`;
              if (k === "preact") pkg.dependencies[k] = "^10.17.0";
            }
            fs.writeFileSync(path, JSON.stringify(pkg, null, 2) + "\n");
          NODE
          NEW=vendor/embedpdf/embedpdf-snippet-${UPSTREAM_VERSION}.tgz
          tar -czf "$NEW" -C "$TMP" package
          # Remove any older snippet tarballs, keep only the new one
          find vendor/embedpdf -maxdepth 1 -name 'embedpdf-snippet-*.tgz' ! -name "$(basename "$NEW")" -delete
          rm -rf "$TMP"
          ls -l vendor/embedpdf

      - name: Update package.json dependency path
        if: steps.gate.outputs.run == 'true'
        run: |
          TARBALL=$(ls vendor/embedpdf/embedpdf-snippet-*.tgz | sort | tail -n1)
          node -e "const fs=require('fs');const pkg=require('./package.json');const tar=process.argv[1];pkg.dependencies['embedpdf-snippet']='file:'+tar;fs.writeFileSync('package.json',JSON.stringify(pkg,null,2)+'\n');" "$TARBALL"

      - name: Refresh lockfile
        if: steps.gate.outputs.run == 'true'
        run: npm install --package-lock-only

      - name: Write upstream version marker
        if: steps.gate.outputs.run == 'true'
        run: |
          echo "${{ steps.upstream-version.outputs.version }}" > vendor/embedpdf/.upstream-version

      - name: Create Pull Request
        if: steps.gate.outputs.run == 'true'
        uses: peter-evans/create-pull-request@v6
        with:
          commit-message: 'chore: update embedpdf snippet'
          title: 'Update vendored EmbedPDF snippet'
          body: |
            - Build snippet from upstream embed-pdf-viewer via `npm run build:snippet`
            - Pack tarball into `vendor/embedpdf/` and point dependency to it
            - Refresh package-lock.json
          branch: chore/update-embedpdf-snippet
          delete-branch: true