name: Docs Build

on:
    push:
        branches: [main]
        paths:
            - "docs/**"
    workflow_dispatch:

defaults:
    run:
        shell: bash

env:
    MISE_GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

concurrency:
    group: ${{ github.workflow }}-${{ github.ref }}
    cancel-in-progress: true

jobs:
    build:
        runs-on: build-arm64
        container:
            image: ghcr.io/nvidia/openshell/ci:latest
            credentials:
                username: ${{ github.actor }}
                password: ${{ secrets.GITHUB_TOKEN }}
        steps:
            - name: Checkout
              uses: actions/checkout@v4

            - name: Install tools
              run: mise install

            - name: Build documentation
              run: mise run docs:build:strict

            - name: Delete unnecessary files
              run: |
                  find _build -name .doctrees -prune -exec rm -rf {} \;
                  find _build -name .buildinfo -exec rm {} \;

            - name: Upload HTML
              uses: actions/upload-artifact@v4
              with:
                  name: html-build-artifact
                  path: _build/docs
                  if-no-files-found: error
                  retention-days: 1

    publish:
        if: false # disabled until GitHub Pages is configured
        needs: [build]
        runs-on: build-arm64
        container:
            image: ghcr.io/nvidia/openshell/ci:latest
            credentials:
                username: ${{ github.actor }}
                password: ${{ secrets.GITHUB_TOKEN }}
        steps:
            - uses: actions/checkout@v4
              with:
                  ref: "gh-pages"

            - name: Initialize Git configuration
              run: |
                  git config --global --add safe.directory "$GITHUB_WORKSPACE"
                  git config --global user.name "github-actions[bot]"
                  git config --global user.email "github-actions[bot]@users.noreply.github.com"

            - name: Download artifacts
              uses: actions/download-artifact@v4
              with:
                  name: html-build-artifact
                  path: ${{ github.ref_name }}

            - name: Copy HTML directories
              run: |
                  ls -asl
                  for i in `ls -d *`
                  do
                    echo "Git adding ${i}"
                    git add "${i}"
                  done
            - name: Check or create dot-no-jekyll file

              run: |
                  if [ -f ".nojekyll" ]; then
                    echo "The dot-no-jekyll file already exists."
                    exit 0
                  fi
                  touch .nojekyll
                  git add .nojekyll

            - name: Check or create redirect page
              env:
                  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
              run: |
                  resp=$(grep 'http-equiv="refresh"' index.html 2>/dev/null) || true
                  if [ -n "${resp}" ]; then
                    echo "The redirect file already exists."
                    exit 0
                  fi
                  def_branch=$(gh api "repos/${GITHUB_REPOSITORY}" --jq ".default_branch")
                  html_url=$(gh api "repos/${GITHUB_REPOSITORY}/pages" --jq ".html_url")
                  echo '<!DOCTYPE html>'                                                                         > index.html
                  echo '<html>'                                                                                 >> index.html
                  echo '  <head>'                                                                               >> index.html
                  echo '    <title>Redirect to documentation</title>'                                           >> index.html
                  echo '    <meta charset="utf-8">'                                                             >> index.html
                  echo '    <meta http-equiv="refresh" content="3; URL='${html_url}${def_branch}'/index.html">' >> index.html
                  echo '    <link rel="canonical" href="'${html_url}${def_branch}'/index.html">'                >> index.html
                  echo '    <script language="javascript">'                                                     >> index.html
                  echo '      function redirect() {'                                                            >> index.html
                  echo '        window.location.assign("'${html_url}${def_branch}'/index.html")'                >> index.html
                  echo '      }'                                                                                >> index.html
                  echo '    </script>'                                                                          >> index.html
                  echo '  </head>'                                                                              >> index.html
                  echo '  <body onload="redirect()">'                                                           >> index.html
                  echo '    <p>Please follow the link to the <a href="'${html_url}${def_branch}'/index.html">'  >> index.html
                  echo      ${def_branch}'</a> branch documentation.</p>'                                       >> index.html
                  echo '  </body>'                                                                              >> index.html
                  echo '</html>'                                                                                >> index.html
                  git add index.html

            - name: Commit changes to the GitHub Pages branch
              run: |
                  git status
                  if git commit -m 'Pushing changes to GitHub Pages.'; then
                    git push -f
                  else
                   echo "Nothing changed."
                  fi