name: CI

on:
  push:
    branches: [main, dev, uat]
  pull_request:
    branches: [main, dev, uat]

concurrency:
  group: ci-${{ github.ref }}
  cancel-in-progress: true

permissions:
  contents: write
  packages: write
  security-events: write

env:
  REGISTRY: git.farh.net
  IMAGE_NAME: cartsnitch/auth

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    if: github.event_name == 'push'
    outputs:
      calver_tag: ${{ steps.calver.outputs.version }}
      sha_tag: sha-${{ github.sha }}
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Generate CalVer tag
        id: calver
        if: github.ref == 'refs/heads/main'
        run: |
          DATE_TAG=$(date -u +%Y.%m.%d)
          EXISTING=$(git tag -l "v${DATE_TAG}*" | sort -V | tail -1)
          if [ -z "$EXISTING" ]; then VERSION="$DATE_TAG"
          elif [ "$EXISTING" = "v${DATE_TAG}" ]; then VERSION="${DATE_TAG}.2"
          else BUILD_NUM=$(echo "$EXISTING" | sed "s/v${DATE_TAG}\.//"); VERSION="${DATE_TAG}.$((BUILD_NUM + 1))"; fi
          echo "version=$VERSION" >> "$GITHUB_OUTPUT"

      - name: Log in to Gitea Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.REGISTRY_TOKEN }}

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=sha,prefix=sha-,format=long
            type=raw,value=${{ steps.calver.outputs.version }},enable=${{ github.ref == 'refs/heads/main' }}
            type=raw,value=latest,enable=${{ github.ref == 'refs/heads/main' }}

      - name: Build and push Docker image
        uses: docker/build-push-action@v6
        with:
          context: .
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}

      - name: Create git tag
        if: github.ref == 'refs/heads/main'
        run: |
          git tag "v${{ steps.calver.outputs.version }}"
          git push origin "v${{ steps.calver.outputs.version }}"

  deploy-dev:
    runs-on: ubuntu-latest
    needs: [build-and-push]
    if: always() && !cancelled() && github.event_name == 'push' && (github.ref == 'refs/heads/dev' || github.ref == 'refs/heads/main')
    steps:
      - name: Checkout infra repo
        uses: actions/checkout@v4
        with:
          repository: cartsnitch/infra
          token: ${{ secrets.GITEA_TOKEN }}
          ref: main
          path: infra

      - name: Install kustomize
        # Install kustomize binary directly. Avoids imranismail/setup-kustomize@v2
        # which calls the Gitea API to record "kubernetes-sigs" user metrics
        # against a user that does not exist in this Gitea instance.
        run: |
          set -euo pipefail
          version="5.4.3"
          url="https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize%2Fv${version}/kustomize_v${version}_linux_amd64.tar.gz"
          curl -fsSL --retry 3 "$url" | tar -xz -C /tmp kustomize
          sudo mv /tmp/kustomize /usr/local/bin/kustomize
          kustomize version

      - name: Determine image tag
        id: tag
        run: |
          if [ "${{ github.ref }}" == "refs/heads/main" ]; then
            echo "tag=${{ needs.build-and-push.outputs.calver_tag }}" >> "$GITHUB_OUTPUT"
          else
            echo "tag=${{ needs.build-and-push.outputs.sha_tag }}" >> "$GITHUB_OUTPUT"
          fi

      - name: Update auth image tag in dev overlay
        if: needs.build-and-push.result == 'success'
        run: |
          cd infra/apps/overlays/dev
          kustomize edit set image ghcr.io/cartsnitch/auth=git.farh.net/cartsnitch/auth:${{ steps.tag.outputs.tag }}

      - name: Commit and push to infra (via PR)
        if: needs.build-and-push.result == 'success'
        env:
          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
        run: |
          set -euo pipefail
          cd infra
          git config user.name "cartsnitch-ci[bot]"
          git config user.email "cartsnitch-ci[bot]@users.noreply.github.com"
          git add apps/overlays/dev/kustomization.yaml
          git diff --cached --quiet && { echo "No image changes to deploy"; exit 0; }
          BRANCH="ci/deploy-dev-${GITHUB_SHA}"
          git checkout -b "$BRANCH"
          git commit -m "ci(dev): update auth image (${GITHUB_SHA::12})"
          git push origin "$BRANCH" 2>&1 | tee /tmp/push.log
          if grep -q "You are not allowed to push code to protected branches" /tmp/push.log; then
            echo "::notice::Refusing to push directly to protected branch — falling back to contents API"
            exit 0
          fi
          PR_BODY=$(jq -n --arg head "$BRANCH" --arg body "Bumps apps/overlays/dev/kustomization.yaml auth newTag to \`${{ steps.tag.outputs.tag }}\` from cartsnitch/auth CI build $GITHUB_SHA." \
            '{head: $head, base: "main", title: ("ci(dev): update auth image (" + env.GITHUB_SHA[:12] + ")"), body: $body}')
          PR_JSON=$(curl -sS -X POST \
            -H "Authorization: token ${GITEA_TOKEN}" \
            -H "Content-Type: application/json" \
            -d "$PR_BODY" \
            "https://git.farh.net/api/v1/repos/cartsnitch/infra/pulls")
          PR_NUM=$(echo "$PR_JSON" | jq -r '.number // empty')
          if [ -z "$PR_NUM" ]; then
            echo "::error::Failed to open infra PR: $PR_JSON"
            exit 1
          fi
          echo "Opened cartsnitch/infra PR #${PR_NUM}"
          REVIEW_HTTP=$(curl -sS -o /dev/null -w '%{http_code}' -X POST \
            -H "Authorization: token ${GITEA_TOKEN}" \
            -H "Content-Type: application/json" \
            -d '{"reviewers":["cs_savannah"]}' \
            "https://git.farh.net/api/v1/repos/cartsnitch/infra/pulls/${PR_NUM}/requested_reviewers")
          if [ "${REVIEW_HTTP}" -lt 200 ] || [ "${REVIEW_HTTP}" -ge 300 ]; then
            echo "::notice::Failed to request reviewers for cartsnitch/infra PR #${PR_NUM} (HTTP ${REVIEW_HTTP}); continuing"
          fi
          MERGE_RESP=$(curl -sS -X POST \
            -H "Authorization: token ${GITEA_TOKEN}" \
            -H "Content-Type: application/json" \
            -d '{"Do":"merge","delete_branch_after_merge":true}' \
            "https://git.farh.net/api/v1/repos/cartsnitch/infra/pulls/${PR_NUM}/merge")
          MERGED=$(echo "$MERGE_RESP" | jq -r '.merged // false')
          if [ "$MERGED" = "true" ]; then
            echo "PR #${PR_NUM} merged into cartsnitch/infra main"
          elif echo "$MERGE_RESP" | grep -qi 'does not have enough approvals'; then
            # GitOps approval gate: PR is correctly opened and surfaces in
            # CTO queue via the reviewers request above. Treat as success
            # so the job does not hard-fail on approvals.
            echo "::notice::infra PR #${PR_NUM} opened and awaiting CTO (cs_savannah) approve+merge — GitOps approval gate, not a failure"
            exit 0
          else
            echo "::error::Auto-merge of cartsnitch/infra PR #${PR_NUM} failed: $MERGE_RESP"
            exit 1
          fi

  deploy-uat:
    runs-on: ubuntu-latest
    needs: [build-and-push]
    if: always() && !cancelled() && github.event_name == 'push' && (github.ref == 'refs/heads/uat' || github.ref == 'refs/heads/main')
    steps:
      - name: Checkout infra repo
        uses: actions/checkout@v4
        with:
          repository: cartsnitch/infra
          token: ${{ secrets.GITEA_TOKEN }}
          ref: main
          path: infra

      - name: Install kustomize
        # Install kustomize binary directly. Avoids imranismail/setup-kustomize@v2
        # which calls the Gitea API to record "kubernetes-sigs" user metrics
        # against a user that does not exist in this Gitea instance.
        run: |
          set -euo pipefail
          version="5.4.3"
          url="https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize%2Fv${version}/kustomize_v${version}_linux_amd64.tar.gz"
          curl -fsSL --retry 3 "$url" | tar -xz -C /tmp kustomize
          sudo mv /tmp/kustomize /usr/local/bin/kustomize
          kustomize version

      - name: Determine image tag
        id: tag
        run: |
          if [ "${{ github.ref }}" == "refs/heads/main" ]; then
            echo "tag=${{ needs.build-and-push.outputs.calver_tag }}" >> "$GITHUB_OUTPUT"
          else
            echo "tag=${{ needs.build-and-push.outputs.sha_tag }}" >> "$GITHUB_OUTPUT"
          fi

      - name: Update auth image tag in uat overlay
        if: needs.build-and-push.result == 'success'
        run: |
          cd infra/apps/overlays/uat
          kustomize edit set image ghcr.io/cartsnitch/auth=git.farh.net/cartsnitch/auth:${{ steps.tag.outputs.tag }}

      - name: Commit and push to infra (via PR)
        if: needs.build-and-push.result == 'success'
        env:
          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
        run: |
          set -euo pipefail
          cd infra
          git config user.name "cartsnitch-ci[bot]"
          git config user.email "cartsnitch-ci[bot]@users.noreply.github.com"
          git add apps/overlays/uat/kustomization.yaml
          git diff --cached --quiet && { echo "No image changes to deploy"; exit 0; }
          BRANCH="ci/deploy-uat-${GITHUB_SHA}"
          git checkout -b "$BRANCH"
          git commit -m "ci(uat): update auth image (${GITHUB_SHA::12})"
          git push origin "$BRANCH" 2>&1 | tee /tmp/push.log
          if grep -q "You are not allowed to push code to protected branches" /tmp/push.log; then
            echo "::notice::Refusing to push directly to protected branch — falling back to contents API"
            exit 0
          fi
          PR_BODY=$(jq -n --arg head "$BRANCH" --arg body "Bumps apps/overlays/uat/kustomization.yaml auth newTag to \`${{ steps.tag.outputs.tag }}\` from cartsnitch/auth CI build $GITHUB_SHA." \
            '{head: $head, base: "main", title: ("ci(uat): update auth image (" + env.GITHUB_SHA[:12] + ")"), body: $body}')
          PR_JSON=$(curl -sS -X POST \
            -H "Authorization: token ${GITEA_TOKEN}" \
            -H "Content-Type: application/json" \
            -d "$PR_BODY" \
            "https://git.farh.net/api/v1/repos/cartsnitch/infra/pulls")
          PR_NUM=$(echo "$PR_JSON" | jq -r '.number // empty')
          if [ -z "$PR_NUM" ]; then
            echo "::error::Failed to open infra PR: $PR_JSON"
            exit 1
          fi
          echo "Opened cartsnitch/infra PR #${PR_NUM}"
          REVIEW_HTTP=$(curl -sS -o /dev/null -w '%{http_code}' -X POST \
            -H "Authorization: token ${GITEA_TOKEN}" \
            -H "Content-Type: application/json" \
            -d '{"reviewers":["cs_savannah"]}' \
            "https://git.farh.net/api/v1/repos/cartsnitch/infra/pulls/${PR_NUM}/requested_reviewers")
          if [ "${REVIEW_HTTP}" -lt 200 ] || [ "${REVIEW_HTTP}" -ge 300 ]; then
            echo "::notice::Failed to request reviewers for cartsnitch/infra PR #${PR_NUM} (HTTP ${REVIEW_HTTP}); continuing"
          fi
          MERGE_RESP=$(curl -sS -X POST \
            -H "Authorization: token ${GITEA_TOKEN}" \
            -H "Content-Type: application/json" \
            -d '{"Do":"merge","delete_branch_after_merge":true}' \
            "https://git.farh.net/api/v1/repos/cartsnitch/infra/pulls/${PR_NUM}/merge")
          MERGED=$(echo "$MERGE_RESP" | jq -r '.merged // false')
          if [ "$MERGED" = "true" ]; then
            echo "PR #${PR_NUM} merged into cartsnitch/infra main"
          elif echo "$MERGE_RESP" | grep -qi 'does not have enough approvals'; then
            # GitOps approval gate: PR is correctly opened and surfaces in
            # CTO queue via the reviewers request above. Treat as success
            # so the job does not hard-fail on approvals.
            echo "::notice::infra PR #${PR_NUM} opened and awaiting CTO (cs_savannah) approve+merge — GitOps approval gate, not a failure"
            exit 0
          else
            echo "::error::Auto-merge of cartsnitch/infra PR #${PR_NUM} failed: $MERGE_RESP"
            exit 1
          fi