# rollback.yml — workflow_dispatch only.
#
# Two modes :
#   fast — flip HAProxy back to the previous color. ~5s. Requires
#          the target color's containers to still be alive
#          (i.e., no later deploy has recycled them).
#   full — re-run deploy_app.yml with a specific (older) release_sha.
#          ~5-10min. The artefact must still be in the Forgejo
#          registry (default retention 30 SHA per component).
#
# See docs/RUNBOOK_ROLLBACK.md for decision criteria.
name: Veza rollback

on:
    workflow_dispatch:
        inputs:
            env:
                description: "Environment to rollback"
                required: true
                type: choice
                options: [staging, prod]
            mode:
                description: "Rollback mode"
                required: true
                type: choice
                options: [fast, full]
            target_color:
                description: "(mode=fast only) color to flip back TO (the prior active one)"
                required: false
                type: choice
                options: [blue, green]
            release_sha:
                description: "(mode=full only) 40-char SHA of the release to redeploy"
                required: false
                type: string

concurrency:
    group: rollback-${{ inputs.env }}
    cancel-in-progress: false

jobs:
    rollback:
        name: Rollback ${{ inputs.env }} (${{ inputs.mode }})
        runs-on: [self-hosted, incus]
        timeout-minutes: 30
        steps:
            - name: Validate inputs
              run: |
                  if [ "${{ inputs.mode }}" = "fast" ] && [ -z "${{ inputs.target_color }}" ]; then
                      echo "mode=fast requires target_color"
                      exit 1
                  fi
                  if [ "${{ inputs.mode }}" = "full" ]; then
                      if [ -z "${{ inputs.release_sha }}" ]; then
                          echo "mode=full requires release_sha"
                          exit 1
                      fi
                      if ! echo "${{ inputs.release_sha }}" | grep -Eq '^[0-9a-f]{40}$'; then
                          echo "release_sha is not a 40-char git SHA"
                          exit 1
                      fi
                  fi

            - uses: actions/checkout@v4
              with:
                  fetch-depth: 1
                  ref: ${{ inputs.mode == 'full' && inputs.release_sha || github.ref }}

            - name: Install ansible + collections
              run: |
                  sudo apt-get update -qq
                  sudo apt-get install -y ansible python3-psycopg2
                  ansible-galaxy collection install \
                      community.general \
                      community.postgresql \
                      community.rabbitmq

            - name: Write vault password
              env:
                  VAULT_PW: ${{ secrets.ANSIBLE_VAULT_PASSWORD }}
              run: |
                  printf '%s' "$VAULT_PW" > "$RUNNER_TEMP/vault-pass"
                  chmod 0400 "$RUNNER_TEMP/vault-pass"
                  echo "VAULT_PASS_FILE=$RUNNER_TEMP/vault-pass" >> "$GITHUB_ENV"

            - name: Run rollback.yml
              working-directory: infra/ansible
              env:
                  ANSIBLE_LOG_PATH: ${{ runner.temp }}/ansible-rollback-${{ inputs.env }}-${{ inputs.mode }}.log
                  ANSIBLE_HOST_KEY_CHECKING: "False"
              run: |
                  EXTRA="-e veza_env=${{ inputs.env }} -e mode=${{ inputs.mode }}"
                  if [ "${{ inputs.mode }}" = "fast" ]; then
                      EXTRA="$EXTRA -e target_color=${{ inputs.target_color }}"
                  else
                      EXTRA="$EXTRA -e veza_release_sha=${{ inputs.release_sha }}"
                      EXTRA="$EXTRA -e vault_forgejo_registry_token=${{ secrets.FORGEJO_REGISTRY_TOKEN }}"
                  fi
                  ansible-playbook \
                      -i inventory/${{ inputs.env }}.yml \
                      playbooks/rollback.yml \
                      --vault-password-file "$VAULT_PASS_FILE" \
                      $EXTRA

            - name: Upload Ansible log
              if: always()
              uses: actions/upload-artifact@v4
              with:
                  name: ansible-rollback-${{ inputs.env }}-${{ inputs.mode }}
                  path: ${{ runner.temp }}/ansible-rollback-*.log
                  retention-days: 30

            - name: Shred vault password file
              if: always()
              run: |
                  if [ -f "$VAULT_PASS_FILE" ]; then
                      shred -u "$VAULT_PASS_FILE" 2>/dev/null || rm -f "$VAULT_PASS_FILE"
                  fi