name: Promote to Production

on:
  workflow_dispatch:
    inputs:
      commit_sha:
        description: 'Specific commit SHA to cherry-pick (leave empty to promote everything in main)'
        type: string
        required: false
        default: ''
      worker_container_increment:
        description: 'Worker container version increment. Defaults to patch.'
        type: choice
        options:
          - major
          - minor
          - patch
        required: false
        default: 'patch'

jobs:
  promote:
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          token: ${{ secrets.PROMOTE_PAT_TOKEN }}

      - name: Configure Git
        run: |
          git config --global user.name "github-actions[bot]"
          git config --global user.email "github-actions[bot]@users.noreply.github.com"

      - name: Setup branches
        run: |
          # Ensure we have latest changes
          git fetch origin

          # Create production branch if it doesn't exist
          if ! git show-ref --verify --quiet refs/remotes/origin/production; then
            echo "Creating production branch from main"
            git checkout -b production origin/main
            git push origin production
          else
            echo "Production branch already exists"
            git checkout production
            git pull origin production
          fi

          # Ensure main is up to date
          git checkout main
          git pull origin main

      - name: Cherry-pick specific commit
        if: ${{ inputs.commit_sha != '' }}
        run: |
          echo "Cherry-picking specific commit: ${{ inputs.commit_sha }}"

          # Validate commit exists in main
          if ! git cat-file -e "${{ inputs.commit_sha }}^{commit}"; then
            echo "Error: Commit ${{ inputs.commit_sha }} does not exist"
            exit 1
          fi

          # Check if commit is in main branch
          if ! git merge-base --is-ancestor "${{ inputs.commit_sha }}" main; then
            echo "Error: Commit ${{ inputs.commit_sha }} is not in main branch"
            exit 1
          fi

          # Switch to production and cherry-pick
          git checkout production

          # Check if commit is already in production
          if git merge-base --is-ancestor "${{ inputs.commit_sha }}" production; then
            echo "Commit ${{ inputs.commit_sha }} is already in production branch"
            exit 0
          fi

          # Cherry-pick the commit
          COMMIT_MSG=$(git log -1 --pretty=format:"%s" "${{ inputs.commit_sha }}")
          echo "Cherry-picking: $COMMIT_MSG"

          if git cherry-pick "${{ inputs.commit_sha }}"; then
            echo "✅ Successfully cherry-picked commit"
            git push origin production
            echo "commit_promoted=true" >> $GITHUB_ENV
          else
            echo "❌ Cherry-pick failed - conflicts may need resolution"
            git cherry-pick --abort
            exit 1
          fi

      - name: Recreate production from main
        if: ${{ inputs.commit_sha == '' }}
        run: |
          echo "Recreating production branch from main"

          # Get current commit on main for summary
          MAIN_COMMIT=$(git rev-parse main)
          MAIN_COMMIT_MSG=$(git log -1 --pretty=format:"%s" main)
          echo "Main branch is at: $MAIN_COMMIT ($MAIN_COMMIT_MSG)"

          # Check if production branch exists remotely
          if git show-ref --verify --quiet refs/remotes/origin/production; then
            PROD_COMMIT=$(git rev-parse origin/production)
            PROD_COMMIT_MSG=$(git log -1 --pretty=format:"%s" origin/production)
            echo "Current production is at: $PROD_COMMIT ($PROD_COMMIT_MSG)"

            # Check if they're already the same
            if [ "$MAIN_COMMIT" = "$PROD_COMMIT" ]; then
              echo "Production is already up to date with main"
              echo "production_updated=false" >> $GITHUB_ENV
              exit 0
            fi

            echo "Deleting existing production branch"
            git push origin --delete production

            # Also delete local production branch if it exists
            if git show-ref --verify --quiet refs/heads/production; then
              echo "Deleting local production branch"
              git branch -D production
            fi
          else
            echo "Production branch doesn't exist, will create new one"
          fi

          # Create new production branch from main
          echo "Creating new production branch from main"
          git checkout main
          git checkout -b production
          git push origin production

          echo "✅ Successfully recreated production branch from main"
          echo "production_updated=true" >> $GITHUB_ENV
          echo "main_commit=$MAIN_COMMIT" >> $GITHUB_ENV

      - name: Create summary
        if: always()
        run: |
          echo "## Promotion Summary" >> $GITHUB_STEP_SUMMARY

          if [ "${{ inputs.commit_sha }}" != "" ]; then
            echo "### Single Commit Promotion" >> $GITHUB_STEP_SUMMARY
            echo "**Target Commit:** \`${{ inputs.commit_sha }}\`" >> $GITHUB_STEP_SUMMARY

            if [ "${commit_promoted:-false}" = "true" ]; then
              echo "✅ **Status:** Successfully promoted to production" >> $GITHUB_STEP_SUMMARY
            else
              echo "❌ **Status:** Promotion failed or commit already existed" >> $GITHUB_STEP_SUMMARY
            fi
          else
            echo "### Bulk Promotion" >> $GITHUB_STEP_SUMMARY

            if [ "${production_updated:-false}" = "true" ]; then
              echo "✅ **Status:** Successfully updated production branch" >> $GITHUB_STEP_SUMMARY
            else
              echo "ℹ️ **Status:** No new commits to promote or production already up to date" >> $GITHUB_STEP_SUMMARY
            fi
          fi

          echo "" >> $GITHUB_STEP_SUMMARY
          echo "### Branches" >> $GITHUB_STEP_SUMMARY
          echo "- **Source:** main" >> $GITHUB_STEP_SUMMARY
          echo "- **Target:** production" >> $GITHUB_STEP_SUMMARY