# CI and publishing on GitHub Actions, for a repository whose source of truth
# is the self-hosted Gitea. Gitea push-mirrors every commit and tag here, and
# this workflow does the heavy work on GitHub's hosted runners -- native arm64
# included -- then reports the result back to Gitea as a commit status.
#
# THE SWITCH. Every job here runs only when the org variable BUILD_ON is
# `github`. Gitea's .gitea/workflows/ci.yml reads the same variable (set on
# the Gitea org too): with it set, Gitea skips its own build jobs and waits for
# the status this workflow posts; without it, Gitea builds everything itself,
# exactly as before, and every job here is skipped. If GitHub is ever
# unavailable, unsetting BUILD_ON on Gitea is the whole fallback.
#
# There is no pull_request trigger: pull requests live on Gitea. A PR's branch
# arrives here as an ordinary push, and the status lands on its head commit,
# which is where Gitea's PR looks for it.
#
# Releases are cut by pushing a tag named `inbuxa-v<version>` (see
# .gitea/workflows/ci.yml for why the prefix matters: this repository carries
# upstream ihasmail's own `v...` tags, and only `inbuxa-v` tags publish).
#
# Org configuration, not in this file:
#   vars.BUILD_ON     `github` to build here
#   vars.REGISTRY     the Gitea container registry's DNS-only name
#   vars.GITEA_URL    Gitea's public URL, for statuses, releases and packages
#   secrets.GITEA_TOKEN  jcoffey-dev, write:repository + write:package
#
# Every `uses:` is pinned to a full commit SHA with the release in the
# trailing comment. A tag is a mutable pointer, so trusting `@v7` is trusting
# every future version of that action. Do not "simplify" a pin back to a tag.
name: ci

on:
  push:
    branches: ['**']
    tags: ['**']
  workflow_dispatch:

permissions:
  contents: read

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

env:
  GITEA_URL: ${{ vars.GITEA_URL }}
  REGISTRY: ${{ vars.REGISTRY }}
  # A registry path must be lowercase; the repository name already is.
  IMAGE: ${{ vars.REGISTRY }}/inbuxa/inbuxa-webmail
  # A tag's context names the tag: upstream v* and inbuxa-v* tags can sit on
  # the same commit, and Gitea must not read one tag's result as the other's.
  STATUS_CONTEXT: github/ci (${{ github.ref_type == 'tag' && format('tag {0}', github.ref_name) || 'branch' }})

jobs:
  # Tells Gitea a result is on its way, so a PR shows the check as running
  # rather than missing.
  pending:
    if: ${{ vars.BUILD_ON == 'github' }}
    runs-on: ubuntu-latest
    steps:
      - env:
          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
        run: |
          jq -n --arg c "$STATUS_CONTEXT" \
                --arg u "$GITHUB_SERVER_URL/$GITHUB_REPOSITORY/actions/runs/$GITHUB_RUN_ID" \
                '{state:"pending", context:$c, target_url:$u, description:"GitHub Actions"}' \
          | curl -fsS -o /dev/null -X POST -H "Authorization: token $GITEA_TOKEN" \
                 -H "Content-Type: application/json" --data @- \
                 "$GITEA_URL/api/v1/repos/$GITHUB_REPOSITORY/statuses/$GITHUB_SHA"

  # -------------------------------------------------------------- test ------
  # version.test.ts shells out to git to resolve a build version from the
  # history, so the checkout is a full one. The hosted runner runs as an
  # unprivileged user, so config.test.ts's read-only directory holds here
  # without the `su node` Gitea needs.
  node:
    if: ${{ vars.BUILD_ON == 'github' }}
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          fetch-depth: 0
      - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
        with:
          node-version: 26
          cache: npm
      # --ignore-scripts: a postinstall script in any transitive dependency
      # would otherwise run with the job's credentials in its environment.
      - run: npm ci --ignore-scripts
      - run: npm run typecheck
      - run: npm test
      - run: npm run build

  # ------------------------------------------------------------- build ------
  # Proves the Dockerfile still builds on every change, without pushing.
  docker-build:
    if: ${{ vars.BUILD_ON == 'github' && github.ref_type == 'branch' }}
    needs: [node]
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
      - run: docker build -t "ihasmail:ci-${GITHUB_SHA::8}" .

  # ----------------------------------------------------------- release ------
  # Only for `inbuxa-v` tags. The tag has to name its own commit's version, so
  # the image, the release and the About screen all agree, and the commit has
  # to be on main, so a release never describes code that was not reviewed
  # onto the default branch.
  version:
    if: ${{ vars.BUILD_ON == 'github' && startsWith(github.ref, 'refs/tags/inbuxa-v') }}
    runs-on: ubuntu-latest
    outputs:
      version: ${{ steps.v.outputs.version }}
      docker_tag: ${{ steps.v.outputs.docker_tag }}
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          fetch-depth: 0
      - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
        with:
          node-version: 26
      - id: v
        env:
          TAG: ${{ github.ref_name }}
        run: |
          set -euo pipefail
          V="$(node scripts/version.mjs)"
          want="inbuxa-v${V/+/-}"
          [ "$TAG" = "$want" ] || { echo "::error::$TAG does not name this commit's version; expected $want"; exit 1; }
          git merge-base --is-ancestor "$(git rev-parse "${TAG}^{commit}")" origin/main \
            || { echo "::error::$TAG is not on main"; exit 1; }
          echo "version=$V" >> "$GITHUB_OUTPUT"
          # A Docker tag may not contain '+', so build metadata becomes '-'.
          echo "docker_tag=${V/+/-}" >> "$GITHUB_OUTPUT"
          echo "version $V -> tag ${V/+/-}"

  # Each architecture on its own native runner, pushed as an untagged image by
  # digest; `publish` joins the two digests into one multi-arch tag.
  build:
    if: ${{ vars.BUILD_ON == 'github' && startsWith(github.ref, 'refs/tags/inbuxa-v') }}
    needs: [node, version]
    runs-on: ${{ matrix.runner }}
    strategy:
      fail-fast: false
      matrix:
        include:
          - platform: linux/amd64
            runner: ubuntu-latest
          - platform: linux/arm64
            runner: ubuntu-24.04-arm
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
      - uses: docker/setup-buildx-action@594f3bf4285d9ea8dc53c9a0c9c4092420091003 # v4.4.0
      - uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
        with:
          registry: ${{ vars.REGISTRY }}
          username: jcoffey-dev
          password: ${{ secrets.GITEA_TOKEN }}
      - name: Build and push by digest
        id: push
        uses: docker/build-push-action@c3c9e263c25d99ce0380d002d59b67737d91b0dc # v7.4.0
        with:
          context: .
          platforms: ${{ matrix.platform }}
          build-args: IHASMAIL_VERSION=${{ needs.version.outputs.version }}
          # Attestations add manifests of their own to the index, and
          # `imagetools create` below expects the two entries pushed here.
          provenance: false
          sbom: false
          cache-from: type=gha,scope=${{ matrix.platform }}
          cache-to: type=gha,mode=max,scope=${{ matrix.platform }}
          outputs: type=image,name=${{ env.IMAGE }},push-by-digest=true,name-canonical=true,push=true
      - name: Save the digest
        env:
          DIGEST: ${{ steps.push.outputs.digest }}
        run: |
          mkdir -p /tmp/digests
          # Bare hash as the filename; the prefix is put back when joining.
          touch "/tmp/digests/${DIGEST#sha256:}"
      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: digest-${{ strategy.job-index }}
          path: /tmp/digests/*
          # Kept a week, and overwritable, so a re-run of the build or of
          # publish alone still finds (or replaces) the digests.
          retention-days: 7
          overwrite: true
          if-no-files-found: error

  # Joins the digests into `:<version>` and `:latest`, links the package to
  # the repository on Gitea, then creates the release there -- last, so a
  # release on the page always has its image behind it. The release is made
  # with GITEA_TOKEN, a user's token, so Gitea's announce.yml fires for it;
  # Gitea's ci.yml announces as well once this run's status arrives, and the
  # announce action posts once per tag whichever gets there first.
  publish:
    if: ${{ vars.BUILD_ON == 'github' && startsWith(github.ref, 'refs/tags/inbuxa-v') }}
    needs: [version, build]
    runs-on: ubuntu-latest
    steps:
      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
        with:
          path: /tmp/digests
          pattern: digest-*
          merge-multiple: true
      - uses: docker/setup-buildx-action@594f3bf4285d9ea8dc53c9a0c9c4092420091003 # v4.4.0
      - uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4.6.0
        with:
          registry: ${{ vars.REGISTRY }}
          username: jcoffey-dev
          password: ${{ secrets.GITEA_TOKEN }}
      - name: Create the manifest
        env:
          DOCKER_TAG: ${{ needs.version.outputs.docker_tag }}
        run: |
          refs=()
          for f in /tmp/digests/*; do refs+=("${IMAGE}@sha256:$(basename "$f")"); done
          docker buildx imagetools create -t "${IMAGE}:${DOCKER_TAG}" -t "${IMAGE}:latest" "${refs[@]}"
          docker buildx imagetools inspect "${IMAGE}:${DOCKER_TAG}"
      # Shows the package on the repository's Packages tab. Idempotent.
      - env:
          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
        run: |
          curl -fsS -o /dev/null -X POST -H "Authorization: token $GITEA_TOKEN" \
            "$GITEA_URL/api/v1/packages/inbuxa/container/inbuxa-webmail/-/link/inbuxa-webmail" \
            || echo "package already linked (or link refused); not fatal"
      - env:
          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
          TAG: ${{ github.ref_name }}
          VERSION: ${{ needs.version.outputs.version }}
          DOCKER_TAG: ${{ needs.version.outputs.docker_tag }}
        run: |
          set -eu
          API="$GITEA_URL/api/v1/repos/$GITHUB_REPOSITORY/releases"
          # A re-run finds the release already there.
          if curl -fsS -o /dev/null -H "Authorization: token $GITEA_TOKEN" "$API/tags/$TAG"; then
            echo "release $TAG already exists"; exit 0
          fi
          body="$(printf 'INBUXA webmail %s.\n\nImage: `%s:%s` (linux/amd64, linux/arm64), also tagged `latest`.' "$VERSION" "$IMAGE" "$DOCKER_TAG")"
          jq -n --arg tag "$TAG" --arg body "$body" '{tag_name:$tag, name:$tag, body:$body}' \
          | curl -fsS -o /dev/null -H "Authorization: token $GITEA_TOKEN" -H "Content-Type: application/json" \
                 --data @- "$API"
          echo "release $TAG created"

  # ------------------------------------------------------ ghcr replica ------
  # Copies the release image from the Gitea registry, which stays the
  # authoritative one, to ghcr.io under the same version tag and :latest. It is
  # a copy, not a second build: the digest on GHCR is the digest on the
  # registry, so `docker pull ghcr.io/...` gets exactly the same image. Left
  # out of the report to Gitea, like the release copy, so a GHCR problem
  # cannot fail a release.
  ghcr:
    if: ${{ vars.BUILD_ON == 'github' && github.ref_type == 'tag' }}
    needs: [version, publish]
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
      - env:
          GH_TOKEN: ${{ github.token }}
          TAG: ${{ needs.version.outputs.docker_tag }}
        run: |
          set -euo pipefail
          src="${{ vars.REGISTRY }}/${GITHUB_REPOSITORY,,}"
          dst="ghcr.io/${GITHUB_REPOSITORY,,}"
          tag="$TAG"
          echo "$GH_TOKEN" | docker login ghcr.io -u "$GITHUB_ACTOR" --password-stdin
          docker buildx imagetools create -t "$dst:$tag" -t "$dst:latest" "$src:$tag"
          want="$(docker buildx imagetools inspect "$src:$tag" --format '{{json .Manifest.Digest}}')"
          got="$(docker buildx imagetools inspect "$dst:$tag" --format '{{json .Manifest.Digest}}')"
          echo "registry $src:$tag = $want"
          echo "ghcr     $dst:$tag = $got"
          [ "$want" = "$got" ] || echo "::warning::GHCR digest differs from the registry's"
          docker logout ghcr.io

  # ---------------------------------------------------- github release ------
  # Copies this tag's Gitea release -- notes and files -- to a GitHub release,
  # so the replica's Releases page, and anyone watching it, keeps up. Gitea's
  # release is the real one; this is left out of the report to Gitea, so a
  # failure here cannot fail a release. PR and issue numbers in the notes are
  # rewritten to Gitea links: on GitHub a bare #16 is some other PR.
  github-release:
    if: ${{ vars.BUILD_ON == 'github' && github.ref_type == 'tag' }}
    needs: [publish]
    runs-on: ubuntu-latest
    permissions:
      contents: write
    env:
      GITEA_URL: ${{ vars.GITEA_URL }}
      GH_TOKEN: ${{ github.token }}
      TAG: ${{ github.ref_name }}
    steps:
      - run: |
          set -euo pipefail
          if gh release view "$TAG" --repo "$GITHUB_REPOSITORY" >/dev/null 2>&1; then
            echo "GitHub already has a release for $TAG"; exit 0
          fi
          # The Gitea release exists by now if this run made it; if the weekly
          # release job made it, it came before the tag. Allow a few minutes.
          code=0
          for _ in $(seq 1 15); do
            code="$(curl -sS -o rel.json -w '%{http_code}' "$GITEA_URL/api/v1/repos/$GITHUB_REPOSITORY/releases/tags/$TAG")"
            [ "$code" = 200 ] && break
            sleep 20
          done
          if [ "$code" != 200 ]; then echo "No Gitea release for $TAG; nothing to copy"; exit 0; fi
          if [ "$(jq -r .draft rel.json)" = true ]; then echo "The Gitea release is a draft; not copying"; exit 0; fi
          export BASE="$(jq -r '.html_url | sub("/releases/tag/.*$"; "")' rel.json)"
          jq -r '.body // ""' rel.json | perl -pe 's{(?<![\w/&\[])#(\d+)\b}{[#$1]($ENV{BASE}/pulls/$1)}g' > notes.md
          printf '\n\n_Mirrored from [the Gitea release](%s); report issues on [Gitea](%s/issues)._\n' \
            "$(jq -r .html_url rel.json)" "$BASE" >> notes.md
          files=()
          mkdir -p files
          while IFS=$'\t' read -r name url; do
            curl -fsSL -o "files/$name" "$url"; files+=("files/$name")
          done < <(jq -r '.assets[]? | [.name, .browser_download_url] | @tsv' rel.json)
          title="$(jq -r '.name // ""' rel.json)"; [ -n "$title" ] || title="$TAG"
          if [ "$(jq -r .prerelease rel.json)" = true ]; then kind=--prerelease; else kind=--latest; fi
          gh release create "$TAG" --repo "$GITHUB_REPOSITORY" --verify-tag --title "$title" \
            --notes-file notes.md "$kind" "${files[@]}"
          echo "created the GitHub release for $TAG with ${#files[@]} file(s)"

  # One commit status on Gitea for the whole run: what Gitea's ci.yml waits
  # for, and what a Gitea PR shows.
  report:
    if: ${{ always() && vars.BUILD_ON == 'github' }}
    needs: [pending, node, docker-build, version, build, publish]
    runs-on: ubuntu-latest
    steps:
      - env:
          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
          STATE: ${{ contains(needs.*.result, 'failure') && 'failure' || (contains(needs.*.result, 'cancelled') && 'cancelled' || 'success') }}
        run: |
          # A cancelled run was superseded by a newer run for the same commit (the
          # mirror can push one commit twice); that run reports. Posting "failure"
          # here would fail the Gitea check while the real build is still going.
          if [ "$STATE" = cancelled ]; then echo "cancelled: leaving the result to the newer run"; exit 0; fi
          jq -n --arg s "$STATE" --arg c "$STATUS_CONTEXT" \
                --arg u "$GITHUB_SERVER_URL/$GITHUB_REPOSITORY/actions/runs/$GITHUB_RUN_ID" \
                '{state:$s, context:$c, target_url:$u, description:"GitHub Actions"}' \
          | curl -fsS -o /dev/null -X POST -H "Authorization: token $GITEA_TOKEN" \
                 -H "Content-Type: application/json" --data @- \
                 "$GITEA_URL/api/v1/repos/$GITHUB_REPOSITORY/statuses/$GITHUB_SHA"
          echo "reported $STATE as '$STATUS_CONTEXT'"