# ─────────────────────────────────────────────────────────────────────────────
# K8s stack deploy pipeline — mirrors .gitea/workflows/deploy-k8s.yml
#
# Triggered on pushes to main when files under k8s/apps/*.tfvars change.
# Two jobs run in sequence:
#   deploy-k8s   — loops over added/modified tfvars and applies each app
#   destroy-k8s  — loops over deleted tfvars, recovers content from git
#                  history, destroys each app and removes its workspace
#
# gopass paths used:
#   infra/kubeconfigs/<app-name>       — kubeconfig for the target cluster
#   apps/<app-name>/rabbitmq_password  — RabbitMQ admin password
#   apps/<app-name>/loki_token         — optional Loki auth bearer token
# ─────────────────────────────────────────────────────────────────────────────

# ─── Shared template: OpenTofu + gopass setup ────────────────────────────────
.deploy_k8s_base:
  image: ubuntu:22.04
  variables:
    GIT_DEPTH: "0"
    TOFU_WORKING_DIR: "k8s"
  before_script:
    - apt-get update -qq && apt-get install -y -qq curl git jq gnupg
    - |
      curl -fsSL https://get.opentofu.org/install-opentofu.sh \
        | sh -s -- --install-method=standalone --opentofu-version=$TOFU_VERSION
    - |
      curl -fsSL https://github.com/gopasspw/gopass/releases/latest/download/gopass-linux-amd64.tar.gz \
        | tar xz
      mv gopass /usr/local/bin/
    - |
      echo "$GOPASS_GPG_KEY" | gpg --batch --import
      gopass clone "$GOPASS_STORE_REPO"

# ─── Deploy / Update ─────────────────────────────────────────────────────────
deploy-k8s:
  extends: .deploy_k8s_base
  stage: deploy
  rules:
    - if: '$CI_COMMIT_BRANCH == "main" && $CI_PIPELINE_SOURCE == "push"'
      changes:
        - k8s/apps/*.tfvars
  script:
    - |
      ADDED_MODIFIED=$(git diff --name-only --diff-filter=ACM \
        "$CI_COMMIT_BEFORE_SHA" "$CI_COMMIT_SHA" -- 'k8s/apps/*.tfvars')

      if [ -z "$ADDED_MODIFIED" ]; then
        echo "No K8s tfvars files added or modified. Nothing to deploy."
        exit 0
      fi

      echo "Files to deploy: $ADDED_MODIFIED"
      FAILED=0

      for TFVARS in $ADDED_MODIFIED; do
        APP=$(basename "$TFVARS" .tfvars)
        echo ""
        echo "══════════════════════════════════════════"
        echo "  Deploying K8s app: $APP"
        echo "══════════════════════════════════════════"

        if ! (
          set -e

          # ── Fetch kubeconfig from gopass ──
          gopass show -o "infra/kubeconfigs/$APP" > /tmp/kubeconfig
          chmod 600 /tmp/kubeconfig

          # ── Fetch app secrets from gopass ──
          RABBITMQ_PASSWORD=$(gopass show -o "apps/$APP/rabbitmq_password" 2>/dev/null || echo "")
          LOKI_AUTH_TOKEN=$(gopass show -o "apps/$APP/loki_token" 2>/dev/null || echo "")

          # ── tofu init with SeaweedFS backend ──
          export AWS_ACCESS_KEY_ID="$SEAWEED_ACCESS_KEY"
          export AWS_SECRET_ACCESS_KEY="$SEAWEED_SECRET_KEY"

          cd "$TOFU_WORKING_DIR"
          tofu init \
            -backend-config="bucket=tofu-state" \
            -backend-config="key=apps-k8s/$APP.tfstate" \
            -backend-config="endpoint=$SEAWEED_S3_ENDPOINT" \
            -backend-config="region=us-east-1" \
            -backend-config="force_path_style=true" \
            -reconfigure

          # ── Workspace ──
          tofu workspace select "$APP" 2>/dev/null || tofu workspace new "$APP"

          # ── Apply ──
          tofu apply -auto-approve \
            -var-file="../$TFVARS" \
            -var="kubeconfig_path=/tmp/kubeconfig" \
            -var="rabbitmq_password=$RABBITMQ_PASSWORD" \
            -var="loki_auth_token=$LOKI_AUTH_TOKEN"

          rm -f /tmp/kubeconfig
          echo "  Deployed K8s app: $APP"
        ); then
          echo "ERROR: Deployment of K8s app $APP failed — continuing with remaining apps"
          FAILED=1
          rm -f /tmp/kubeconfig
        fi
      done

      if [ $FAILED -ne 0 ]; then
        echo ""
        echo "One or more K8s deployments failed. See logs above for details."
        exit 1
      fi
  after_script:
    - rm -f /tmp/kubeconfig

# ─── Destroy (tfvars file deleted) ───────────────────────────────────────────
destroy-k8s:
  extends: .deploy_k8s_base
  stage: destroy
  rules:
    - if: '$CI_COMMIT_BRANCH == "main" && $CI_PIPELINE_SOURCE == "push"'
      changes:
        - k8s/apps/*.tfvars
  script:
    - |
      DELETED=$(git diff --name-only --diff-filter=D \
        "$CI_COMMIT_BEFORE_SHA" "$CI_COMMIT_SHA" -- 'k8s/apps/*.tfvars')

      if [ -z "$DELETED" ]; then
        echo "No K8s tfvars files deleted. Nothing to destroy."
        exit 0
      fi

      echo "Files to destroy: $DELETED"
      FAILED=0

      for TFVARS in $DELETED; do
        APP=$(basename "$TFVARS" .tfvars)
        echo ""
        echo "══════════════════════════════════════════"
        echo "  Destroying K8s app: $APP"
        echo "══════════════════════════════════════════"

        if ! (
          set -e

          # ── Recover deleted tfvars from git history ──
          git show "$CI_COMMIT_BEFORE_SHA:$TFVARS" > /tmp/${APP}.tfvars

          # ── Fetch kubeconfig from gopass ──
          gopass show -o "infra/kubeconfigs/$APP" > /tmp/kubeconfig
          chmod 600 /tmp/kubeconfig

          # ── Fetch app secrets from gopass ──
          RABBITMQ_PASSWORD=$(gopass show -o "apps/$APP/rabbitmq_password" 2>/dev/null || echo "")
          LOKI_AUTH_TOKEN=$(gopass show -o "apps/$APP/loki_token" 2>/dev/null || echo "")

          # ── tofu init ──
          export AWS_ACCESS_KEY_ID="$SEAWEED_ACCESS_KEY"
          export AWS_SECRET_ACCESS_KEY="$SEAWEED_SECRET_KEY"

          cd "$TOFU_WORKING_DIR"
          tofu init \
            -backend-config="bucket=tofu-state" \
            -backend-config="key=apps-k8s/$APP.tfstate" \
            -backend-config="endpoint=$SEAWEED_S3_ENDPOINT" \
            -backend-config="region=us-east-1" \
            -backend-config="force_path_style=true" \
            -reconfigure

          # ── Select existing workspace ──
          tofu workspace select "$APP"

          # ── Destroy ──
          tofu destroy -auto-approve \
            -var-file="/tmp/${APP}.tfvars" \
            -var="kubeconfig_path=/tmp/kubeconfig" \
            -var="rabbitmq_password=$RABBITMQ_PASSWORD" \
            -var="loki_auth_token=$LOKI_AUTH_TOKEN"

          # ── Remove workspace ──
          tofu workspace select default
          tofu workspace delete "$APP"

          rm -f /tmp/${APP}.tfvars /tmp/kubeconfig
          echo "  Destroyed K8s app: $APP"
        ); then
          echo "ERROR: Destroy of K8s app $APP failed — continuing with remaining apps"
          FAILED=1
          rm -f /tmp/${APP}.tfvars /tmp/kubeconfig
        fi
      done

      if [ $FAILED -ne 0 ]; then
        echo ""
        echo "One or more K8s destroy operations failed. See logs above for details."
        exit 1
      fi
  after_script:
    - rm -f /tmp/kubeconfig /tmp/*.tfvars