name: Build & Push Docker Image

on:
  push:
    branches: [main]
    paths-ignore:
      - 'docs/**'
      - '**/*.md'
  workflow_dispatch:

permissions:
  contents: write

jobs:
  version-bump:
    runs-on: ubuntu-latest
    outputs:
      version: ${{ steps.bump.outputs.VERSION }}
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Determine bump type and update version
        id: bump
        run: |
          # Check if this push is a merge commit from dev branch
          COMMIT_MSG=$(git log -1 --pretty=%s)
          PARENT_COUNT=$(git log -1 --pretty=%p | wc -w)

          if echo "$COMMIT_MSG" | grep -qiE "^Merge (pull request|branch).*dev"; then
            BUMP="minor"
          elif [ "$PARENT_COUNT" -gt 1 ] && git log -1 --pretty=%P | xargs -n1 git branch -r --contains 2>/dev/null | grep -q "origin/dev"; then
            BUMP="minor"
          else
            BUMP="patch"
          fi

          echo "Bump type: $BUMP"

          # Read current version
          CURRENT=$(node -p "require('./server/package.json').version")
          IFS='.' read -r MAJOR MINOR PATCH <<< "$CURRENT"

          if [ "$BUMP" = "minor" ]; then
            MINOR=$((MINOR + 1))
            PATCH=0
          else
            PATCH=$((PATCH + 1))
          fi

          NEW_VERSION="${MAJOR}.${MINOR}.${PATCH}"
          echo "VERSION=$NEW_VERSION" >> $GITHUB_OUTPUT
          echo "$CURRENT → $NEW_VERSION ($BUMP)"

          # Update both package.json files
          cd server && npm version "$NEW_VERSION" --no-git-tag-version && cd ..
          cd client && npm version "$NEW_VERSION" --no-git-tag-version && cd ..

          # Commit and tag
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git add server/package.json server/package-lock.json client/package.json client/package-lock.json
          git commit -m "chore: bump version to $NEW_VERSION [skip ci]"
          git tag "v$NEW_VERSION"
          git push origin main --follow-tags

  build:
    runs-on: ${{ matrix.runner }}
    needs: version-bump
    strategy:
      fail-fast: false
      matrix:
        include:
          - platform: linux/amd64
            runner: ubuntu-latest
          - platform: linux/arm64
            runner: ubuntu-24.04-arm
    steps:
      - name: Prepare platform tag-safe name
        run: echo "PLATFORM_PAIR=$(echo ${{ matrix.platform }} | sed 's|/|-|g')" >> $GITHUB_ENV

      - uses: actions/checkout@v4
        with:
          ref: main

      - uses: docker/setup-buildx-action@v3

      - uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Build and push by digest
        id: build
        uses: docker/build-push-action@v6
        with:
          context: .
          platforms: ${{ matrix.platform }}
          outputs: type=image,name=mauriceboe/trek,push-by-digest=true,name-canonical=true,push=true
          no-cache: true

      - name: Export digest
        run: |
          mkdir -p /tmp/digests
          digest="${{ steps.build.outputs.digest }}"
          touch "/tmp/digests/${digest#sha256:}"

      - name: Upload digest artifact
        uses: actions/upload-artifact@v4
        with:
          name: digests-${{ env.PLATFORM_PAIR }}
          path: /tmp/digests/*
          if-no-files-found: error
          retention-days: 1

  merge:
    runs-on: ubuntu-latest
    needs: [version-bump, build]
    steps:
      - uses: actions/checkout@v4
        with:
          ref: main

      - name: Download build digests
        uses: actions/download-artifact@v4
        with:
          path: /tmp/digests
          pattern: digests-*
          merge-multiple: true

      - uses: docker/setup-buildx-action@v3

      - uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Create and push multi-arch manifest
        working-directory: /tmp/digests
        run: |
          VERSION=${{ needs.version-bump.outputs.version }}
          mapfile -t digests < <(printf 'mauriceboe/trek@sha256:%s\n' *)
          docker buildx imagetools create \
            -t mauriceboe/trek:latest \
            -t mauriceboe/trek:$VERSION \
            -t mauriceboe/nomad:latest \
            -t mauriceboe/nomad:$VERSION \
            "${digests[@]}"

      - name: Inspect manifest
        run: docker buildx imagetools inspect mauriceboe/trek:latest