name: Deploy to GitHub Pages

on:
  push:
    branches: [main]
    paths:
      - 'content/**'
      - 'translations/**'
      - 'templates/**'
      - 'site/**'
      - 'html-generators/generateog.java'
      - 'html-generators/og/**'
  workflow_run:
    workflows: ['Build Generator JARs']
    types: [completed]
    branches: [main]
  workflow_dispatch:

permissions:
  contents: read
  pages: write
  id-token: write

concurrency:
  group: pages
  cancel-in-progress: false

jobs:
  build:
    runs-on: ubuntu-latest
    if: ${{ github.event_name != 'workflow_run' || github.event.workflow_run.conclusion == 'success' }}
    steps:
      - uses: actions/checkout@v6
        with:
          fetch-depth: 2

      - name: Detect changed paths
        id: changes
        run: |
          # OG images are gitignored and must always be regenerated
          echo "og=true" >> "$GITHUB_OUTPUT"

          if [[ "${{ github.event_name }}" == "workflow_dispatch" ]]; then
            echo "generate=true" >> "$GITHUB_OUTPUT"
          elif [[ "${{ github.event_name }}" == "workflow_run" ]]; then
            # Generator JAR was rebuilt — regenerate HTML
            echo "generate=true" >> "$GITHUB_OUTPUT"
          else
            # Push event — check which files changed
            CHANGED=$(git diff --name-only HEAD~1 HEAD)
            echo "Changed files:"
            echo "$CHANGED"

            NEEDS_GENERATE=false

            if echo "$CHANGED" | grep -qE '^(content/|translations/|templates/)'; then
              NEEDS_GENERATE=true
            fi

            echo "generate=$NEEDS_GENERATE" >> "$GITHUB_OUTPUT"
          fi
          echo "Summary: generate=${{ steps.changes.outputs.generate || 'pending' }}, og=${{ steps.changes.outputs.og || 'pending' }}"

      - uses: actions/setup-java@v5
        if: steps.changes.outputs.generate == 'true' || steps.changes.outputs.og == 'true'
        with:
          distribution: 'temurin'
          java-version: '25'

      # --- HTML generation (content/templates/translations changed) ---
      - name: Restore cached generate JAR and AOT
        id: cache-restore
        if: steps.changes.outputs.generate == 'true'
        uses: actions/cache/restore@v5
        with:
          path: |
            html-generators/generate.jar
            html-generators/generate.aot
          key: generator-${{ hashFiles('html-generators/generate.java') }}

      - name: Generate HTML with cached JAR + AOT
        if: steps.changes.outputs.generate == 'true' && steps.cache-restore.outputs.cache-hit == 'true'
        run: java -XX:Tier4CompileThreshold=100 -XX:AOTCache=html-generators/generate.aot -jar html-generators/generate.jar

      - name: Setup JBang (cache miss)
        if: steps.changes.outputs.generate == 'true' && steps.cache-restore.outputs.cache-hit != 'true'
        uses: jbangdev/setup-jbang@main

      - name: Generate HTML with JBang (cache miss)
        if: steps.changes.outputs.generate == 'true' && steps.cache-restore.outputs.cache-hit != 'true'
        run: jbang html-generators/generate.java

      # --- OG card generation (content/templates/translations or generateog.java changed) ---
      - name: Restore cached generateog JAR and AOT
        id: cache-restore-og
        if: steps.changes.outputs.og == 'true'
        uses: actions/cache/restore@v5
        with:
          path: |
            html-generators/generateog.jar
            html-generators/generateog.aot
          key: generateog-${{ hashFiles('html-generators/generateog.java') }}

      - name: Generate OG cards with cached JAR + AOT
        if: steps.changes.outputs.og == 'true' && steps.cache-restore-og.outputs.cache-hit == 'true'
        run: java -XX:Tier4CompileThreshold=100 -XX:AOTCache=html-generators/generateog.aot -jar html-generators/generateog.jar

      - name: Generate OG cards with JBang (cache miss)
        if: steps.changes.outputs.og == 'true' && steps.cache-restore-og.outputs.cache-hit != 'true'
        run: |
          if ! command -v jbang &> /dev/null; then
            echo "Installing JBang..."
            curl -Ls https://sh.jbang.dev | bash -s - app setup
            export PATH="$HOME/.jbang/bin:$PATH"
          fi
          jbang html-generators/generateog.java

      - name: Setup Pages
        uses: actions/configure-pages@v5

      - name: Upload artifact
        uses: actions/upload-pages-artifact@v4
        with:
          path: site

  deploy:
    needs: build
    runs-on: ubuntu-latest
    environment:
      name: github-pages
      url: ${{ steps.deployment.outputs.page_url }}
    steps:
      - name: Deploy to GitHub Pages
        id: deployment
        uses: actions/deploy-pages@v4