name: Build and Push foundryvtt Docker Image

on:
  push:
    branches:
      - master
    paths-ignore:
      - '**/CHANGES.md'
      - '**/build-info.json'
  schedule:
    - cron: '30 */6 * * *'  # Every 6 hours

env:
  IMAGE_REGISTRY: gitea.fithwum.tech
  IMAGE_ORG: ${{ secrets.GIT_USERNAME }}
  IMAGE_REPO_TS: foundry_vtt

jobs:
  check-for-changes:
    runs-on: doc-docker-build
    outputs:
      should_build: ${{ steps.check.outputs.should_build }}
    steps:
      - name: Checkout code
        uses: actions/checkout@v3

      - name: Pull latest alpine base
        run: docker pull alpine:latest

      - name: Get current base image digest
        id: get_digest
        run: |
          digest=$(docker inspect --format='{{index .RepoDigests 0}}' alpine:latest || echo "unknown")
          echo "digest=$digest" >> $GITHUB_OUTPUT

      - name: Determine if base changed or alpine files changed
        id: check
        run: |
          base_changed=false
          code_changed=false

          new_digest="${{ steps.get_digest.outputs.digest }}"
          infofile="alpine/build-info.json"
          last_digest=""

          if [ -f "$infofile" ]; then
            last_digest=$(jq -r '.base_digest // empty' "$infofile")
          fi

          if [ "$last_digest" != "$new_digest" ]; then
            base_changed=true
          fi

          if git diff --name-only HEAD~1 HEAD | grep '^alpine/' > /dev/null; then
            code_changed=true
          fi

          if [ "$base_changed" = true ] || [ "$code_changed" = true ]; then
            echo "should_build=true" >> $GITHUB_OUTPUT
          else
            echo "should_build=false" >> $GITHUB_OUTPUT
          fi

  build:
    needs: check-for-changes
    if: needs.check-for-changes.outputs.should_build == 'true'
    runs-on: doc-docker-build
    steps:
      - name: Checkout code
        uses: actions/checkout@v3

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Log in to Gitea Registry
        run: echo "${{ secrets.DOCKER_PASSWORD }}" | docker login gitea.fithwum.tech -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin

      - name: Build Docker image
        run: |
          docker buildx build --platform linux/amd64 --push -t gitea.fithwum.tech/fithwum/foundry_vtt:alpine ./alpine

  generate-changelogs:
    needs: build
    runs-on: doc-docker-build
    steps:
      - name: Checkout source
        uses: actions/checkout@v3

      - name: Clone FoundryVTT repo
        run: |
          git clone https://${{ secrets.GIT_USERNAME }}:${{ secrets.GIT_TOKEN }}@gitea.fithwum.tech/fithwum/foundryvtt.git upload-repo

      - name: Generate changelog for alpine
        run: |
          cd upload-repo
          version="alpine"
          changelog="$version/CHANGES.md"
          mkdir -p "$(dirname "$changelog")"
          touch "$changelog"

          infofile="$version/build-info.json"
          last_commit=""
          if [ -f "$infofile" ]; then
            last_commit=$(jq -r '.commit' "$infofile")
          fi

          echo -e "\n## $(date -u +'%Y-%m-%dT%H:%M:%SZ')" >> "$changelog"
          if [ -n "$last_commit" ]; then
            git log "${last_commit}..HEAD" --pretty=format:"- %s (%an)" | head -n 10 >> "$changelog"
          else
            git log -n 10 --pretty=format:"- %s (%an)" >> "$changelog"
          fi

      - name: Commit and push changelogs if changed
        run: |
          cd upload-repo
          git config user.name "${{ secrets.GIT_USERNAME }}"
          git config user.email "${{ secrets.GIT_EMAIL }}"

          if git status --porcelain | grep .; then
            git add alpine/CHANGES.md
            git commit -m "Update changelog on $(date -u +'%Y-%m-%dT%H:%M:%SZ')" --no-verify
            git push
          else
            echo "[INFO] No changelog changes to commit."
          fi

  generate-build-info:
    needs: generate-changelogs
    runs-on: doc-docker-build
    steps:
      - name: Checkout source
        uses: actions/checkout@v3

      - name: Clone FoundryVTT repo
        run: |
          git clone https://${{ secrets.GIT_USERNAME }}:${{ secrets.GIT_TOKEN }}@gitea.fithwum.tech/fithwum/foundryvtt.git upload-repo

      - name: Generate build-info.json for alpine
        run: |
          human_size() {
            local b=$1
            local d=''
            local s=0
            local S=(B KB MB GB TB)
            while ((b >= 1024 && s < ${#S[@]}-1)); do
              d=$((b % 1024))
              b=$((b / 1024))
              s=$((s + 1))
            done
            printf "%s%s\n" "$b" "${S[$s]}"
          }

          cd upload-repo
          version="alpine"
          mkdir -p "$version"
          infofile="$version/build-info.json"

          image="gitea.fithwum.tech/fithwum/foundry_vtt:$version"

          digest=$(docker inspect --format='{{if .RepoDigests}}{{index .RepoDigests 0}}{{else}}unknown{{end}}' "$image" 2>/dev/null || echo "unknown")
          size_bytes=$(docker image inspect "$image" --format='{{.Size}}' 2>/dev/null || echo "0")

          base_digest=$(docker inspect --format='{{index .RepoDigests 0}}' alpine:latest || echo "unknown")

          size_bytes=${size_bytes//[^0-9]/}
          if [[ -z "$size_bytes" ]]; then size_bytes=0; fi

          size_human=$(human_size "$size_bytes")

          jq -n \
            --arg version "$version" \
            --arg commit "$(git rev-parse HEAD)" \
            --arg build_time "$(date -u +'%Y-%m-%dT%H:%M:%SZ')" \
            --arg image_tag "$image" \
            --arg digest "$digest" \
            --arg base_digest "$base_digest" \
            --arg image_size "$size_human" \
            --argjson image_size_bytes "$size_bytes" \
            '{
              version: $version,
              commit: $commit,
              build_time: $build_time,
              image_tag: $image_tag,
              digest: $digest,
              base_digest: $base_digest
              image_size: $image_size,
              image_size_bytes: $image_size_bytes
            }' > "$infofile"

      - name: Commit and push build-info if changed
        run: |
          cd upload-repo
          git config user.name "${{ secrets.GIT_USERNAME }}"
          git config user.email "${{ secrets.GIT_EMAIL }}"

          if git status --porcelain | grep .; then
            git add alpine/build-info.json
            git commit -m "Update build-info on $(date -u +'%Y-%m-%dT%H:%M:%SZ')"
            git push

            # Tag the commit
            TAG="build-alpine"
            git tag -d "$TAG" 2>/dev/null || true
            git tag "$TAG"
            git push origin "$TAG" --force
          else
            echo "[INFO] No build-info changes to commit."
          fi