name: Documentation

on:
  issue_comment:
      types: [created]

permissions:
  contents: read # to fetch code (actions/checkout)

jobs:
  build:

    permissions:
      contents: read # to fetch code (actions/checkout)
      pull-requests: write # to create comment

    runs-on: ubuntu-latest
    steps:
      - uses: actions/github-script@v7
        id: get_round
        with:
         result-encoding: string
         script: |
           const asso = context.payload.comment.author_association
           if(asso == 'OWNER' || asso == 'MEMBER') {
             const body = context.payload.comment.body
             if(body.includes("build:")) {
               const re = /\/(force-)?build:(\w+)\s*/;
               if(re.test(body)){
                 const res = re.exec(body)
                 if(body.includes("force-")) {
                   return res[2]+":yes"
                 }
                 else{
                   return res[2]+":no"
                 }
               }
             }
           }
           return 'stop'
      - uses: actions/github-script@v7
        if: steps.get_round.outputs.result != 'stop'
        id: get_pr_number
        with:
         result-encoding: string
         script: |
           //get pullrequest url
           const pr_number = context.payload.issue.number
           return pr_number

      - name: Emoji-comment
        uses: actions/github-script@v7
        if: steps.get_round.outputs.result != 'stop'
        with:
          script: |
            github.rest.reactions.createForIssueComment({
              comment_id: ${{ github.event.comment.id }},
              owner: context.repo.owner,
              repo: context.repo.repo,
              content: 'rocket'
            })

      - uses: actions/checkout@v4
        name: "checkout branch"
        if: steps.get_round.outputs.result != 'stop'
        with:
           repository: ${{ github.repository }}
           ref: refs/pull/${{ steps.get_pr_number.outputs.result }}/merge
           fetch-depth: 2

      - name: install dependencies
        if: steps.get_round.outputs.result != 'stop'
        run: |
          set -x
          sudo apt-get update && sudo apt-get install -y graphviz ssh bibtex2html
          sudo pip install lxml
          sudo pip install pyquery
          wget --no-verbose -O doxygen_exe https://cgal.geometryfactory.com/~cgaltest/doxygen_1_9_6_patched/doxygen
          sudo mv doxygen_exe /usr/bin/doxygen
          sudo chmod +x /usr/bin/doxygen
          git config --global user.email "cgal@geometryfactory.com"
          git config --global user.name "cgaltest"

      - name: configure all
        if: steps.get_round.outputs.result != 'stop'
        run: |
          set -ex
          mkdir -p build_doc && cd build_doc && cmake ../Documentation/doc

      - name: Build and Upload Doc
        id: build_and_run
        if: steps.get_round.outputs.result != 'stop'
        run: |
          set -ex
          PR_NUMBER=${{ steps.get_pr_number.outputs.result }}
          TMP_ROUND=${{ steps.get_round.outputs.result }}
          ROUND=$(echo $TMP_ROUND | cut -d ":" -f 1)
          force=$(echo $TMP_ROUND | cut -d ":" -f 2)
          wget --no-verbose cgal.github.io -O tmp.html
          if ! egrep -q "\/$PR_NUMBER\/$ROUND" tmp.html || [ "$force" = "yes" ]; then
            #list impacted packages
            LIST_OF_PKGS=$(git diff --name-only HEAD^1 HEAD |cut -s -d/ -f1 |sort -u | xargs -I {} echo {} && ls -d {}/package_info 2>/dev/null  |cut -d/ -f1 |egrep -v Installation||true)
            if [ "$LIST_OF_PKGS" = "" ]; then
              echo "DoxygenError=No package affected." >> $GITHUB_OUTPUT
              exit 1
            fi
            cd build_doc && make -j2 doc
            make -j2 doc_with_postprocessing 2>tmp.log
            if [ -s tmp.log ]; then
              content=`cat ./tmp.log`
              delimiter="$(openssl rand -hex 8)"
              echo "DoxygenError<<${delimiter}" >> "${GITHUB_OUTPUT}"
              cat tmp.log >> "${GITHUB_OUTPUT}"
              echo "${delimiter}" >> "${GITHUB_OUTPUT}"
              exit 1
            fi
            cd ..
            git clone https://CGAL:${{ secrets.PUSH_TO_CGAL_GITHUB_IO_TOKEN }}@github.com/CGAL/cgal.github.io.git
            mkdir -p cgal.github.io/${PR_NUMBER}/$ROUND
            rm cgal.github.io/${PR_NUMBER}/$ROUND/* -rf
            for f in $LIST_OF_PKGS
            do
              if [ -d ./build_doc/doc_output/$f ]; then
                cp -r ./build_doc/doc_output/$f ./cgal.github.io/${PR_NUMBER}/$ROUND
              fi
            done
            cp -r ./build_doc/doc_output/Manual ./cgal.github.io/${PR_NUMBER}/$ROUND
            cd ./cgal.github.io
            egrep -v " ${PR_NUMBER}\." index.html > tmp.html || true
            echo "<li><a href=https://cgal.github.io/${PR_NUMBER}/$ROUND/Manual/index.html>Manual for PR ${PR_NUMBER} ($ROUND).</a></li>" >> ./tmp.html
            mv tmp.html index.html
            git add ${PR_NUMBER}/$ROUND index.html && git commit -q --amend -m "base commit" && git push -q -f -u origin master
          else
            echo "DoxygenError=This round already exists. Overwrite it with /force-build." >> $GITHUB_OUTPUT
            exit 1
          fi

      - name: Post address
        uses: actions/github-script@v7
        if: ${{ success() && steps.get_round.outputs.result != 'stop' }}
        with:
          script: |
            const tmp_round = "${{ steps.get_round.outputs.result }}";
            const id = tmp_round.indexOf(":");
            const round = tmp_round.substring(0,id);
            const address = "The documentation is built. It will be available, after a few minutes, here: https://cgal.github.io/${{ steps.get_pr_number.outputs.result }}/"+round+"/Manual/index.html"
            github.rest.issues.createComment({
              owner: "CGAL",
              repo: "cgal",
              issue_number: ${{ github.event.issue.number }},
              body: address
            });

      - name: Post error
        env:
          ERRORMSG: ${{steps.build_and_run.outputs.DoxygenError}}
        uses: actions/github-script@v7
        if: ${{ failure() && steps.get_round.outputs.result != 'stop' }}
        with:
          script: |
            const error = process.env.ERRORMSG
            const job_url = `${context.serverUrl}/CGAL/cgal/actions/runs/${context.runId}`
            const msg = "There was an error while building the doc: \n```\n"+error + "\n```\n" + job_url
            github.rest.issues.createComment({
              owner: "CGAL",
              repo: "cgal",
              issue_number: ${{ github.event.issue.number }},
              body: msg
            });