name: Promote main to next

on:
  workflow_dispatch:

jobs:
  validate-main:
    uses: ./.github/workflows/validate-main-green-ci.yml
    with:
      branch: main
      required_contexts: ci-ok|ci-main / ci-ok

  promote:
    needs: validate-main
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - uses: actions/checkout@v5
        with:
          fetch-depth: 0
          ref: next
      - name: setup node
        uses: actions/setup-node@v5
        with:
          node-version: lts/*
      - name: fast-forward next to main
        run: |
          set -euo pipefail
          git fetch origin main next
          # Reset channel branch to main snapshot, then create a fresh RC bump commit.
          git reset --hard origin/main
      - name: bump package version to next RC
        run: |
          set -euo pipefail
          git fetch --tags origin
          CURRENT_VERSION="$(node -p 'require("./package.json").version')"
          BASE_VERSION="$(node -p 'const v=require("./package.json").version; const m=v.match(/^(\d+\.\d+\.\d+)/); if(!m){throw new Error("Invalid version: "+v)}; m[1]')"
          MAX_RC="$(git tag -l "app-v${BASE_VERSION}-rc.*" | sed -E 's/.*-rc\.([0-9]+)$/\1/' | sort -n | tail -n1)"
          if [[ -z "$MAX_RC" ]]; then
            NEXT_RC=1
          else
            NEXT_RC=$((MAX_RC + 1))
          fi
          TARGET_VERSION="${BASE_VERSION}-rc.${NEXT_RC}"
          if [[ "$CURRENT_VERSION" == "$TARGET_VERSION" ]]; then
            echo "package.json already uses $TARGET_VERSION"
            exit 0
          fi
          npm version --no-git-tag-version "$TARGET_VERSION"
      - name: commit RC version bump
        run: |
          set -euo pipefail
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git add package.json package-lock.json
          if git diff --cached --quiet; then
            echo "No version bump changes to commit."
            exit 0
          fi
          NEW_VERSION="$(node -p 'require("./package.json").version')"
          git commit -m "chore(release): bump next channel to ${NEW_VERSION}"
      - name: push next
        run: git push --force-with-lease origin HEAD:next