name: Preview

on:
  workflow_dispatch:
    inputs:
      commit:
        description: Optional master commit SHA to publish
        required: false
        type: string
  schedule:
    - cron: "0 3 * * 3,5"

permissions:
  contents: read

env:
  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true

concurrency:
  group: preview-publish
  cancel-in-progress: false

jobs:
  preflight:
    runs-on: ubuntu-latest
    permissions:
      contents: read
    outputs:
      should_publish: ${{ steps.plan.outputs.should_publish }}
      commit: ${{ steps.plan.outputs.commit }}
      short_sha: ${{ steps.plan.outputs.short_sha }}
      build_id: ${{ steps.plan.outputs.build_id }}
      tag: ${{ steps.plan.outputs.tag }}
      built_at: ${{ steps.plan.outputs.built_at }}
      base_version: ${{ steps.plan.outputs.base_version }}
      protocol: ${{ steps.plan.outputs.protocol }}
    steps:
      - uses: actions/checkout@v6
        with:
          ref: master
          fetch-depth: 0
          persist-credentials: false

      - name: Select preview commit
        id: plan
        shell: bash
        run: |
          set -euo pipefail
          git fetch origin master --tags
          requested="${{ github.event.inputs.commit || '' }}"
          if [ -n "$requested" ]; then
            commit="$(git rev-parse "$requested^{commit}")"
            if ! git merge-base --is-ancestor "$commit" origin/master; then
              echo "error: requested commit $commit is not reachable from origin/master" >&2
              exit 1
            fi
          else
            commit="$(python3 scripts/preview.py select-commit --ref origin/master)"
          fi
          current_preview="$(python3 scripts/preview.py current-commit --manifest website/preview.json || true)"
          if [ "$current_preview" = "$commit" ]; then
            echo "Preview already points at $commit; skipping."
            echo "should_publish=false" >> "$GITHUB_OUTPUT"
            exit 0
          fi
          git checkout --detach "$commit"
          short_sha="$(git rev-parse --short=12 HEAD)"
          day="$(git show -s --format=%cs HEAD)"
          built_at="$(date -u +%Y-%m-%dT%H:%M:%SZ)"
          build_id="$day-$short_sha"
          tag="preview-$build_id"
          base_version="$(sed -n 's/^version = "\(.*\)"/\1/p' Cargo.toml | head -1)"
          protocol="$(python3 -c 'import re; print(re.search(r"pub const PROTOCOL_VERSION: u32 = (\d+);", open("src/protocol/wire.rs").read()).group(1))')"
          {
            echo "should_publish=true"
            echo "commit=$commit"
            echo "short_sha=$short_sha"
            echo "build_id=$build_id"
            echo "tag=$tag"
            echo "built_at=$built_at"
            echo "base_version=$base_version"
            echo "protocol=$protocol"
          } >> "$GITHUB_OUTPUT"

      - name: Install Rust
        if: steps.plan.outputs.should_publish == 'true'
        uses: dtolnay/rust-toolchain@stable

      - name: Install Rust tools
        if: steps.plan.outputs.should_publish == 'true'
        uses: taiki-e/install-action@b550161ef8a7bc4f2a671c0b03a18ac9ccedea1e # v2
        with:
          tool: just,cargo-nextest

      - name: Install Zig
        if: steps.plan.outputs.should_publish == 'true'
        uses: mlugg/setup-zig@d1434d08867e3ee9daa34448df10607b98908d29 # v2.2.1
        with:
          version: 0.15.2

      - name: Restore cargo cache
        if: steps.plan.outputs.should_publish == 'true'
        uses: Swatinem/rust-cache@v2
        with:
          cache-bin: false

      - name: Run checks
        if: steps.plan.outputs.should_publish == 'true'
        run: just check

  build:
    needs: preflight
    if: needs.preflight.outputs.should_publish == 'true'
    permissions:
      contents: read
    strategy:
      fail-fast: false
      matrix:
        include:
          - target: x86_64-unknown-linux-musl
            os: ubuntu-latest
            name: herdr-linux-x86_64
          - target: aarch64-unknown-linux-musl
            os: ubuntu-latest
            name: herdr-linux-aarch64
          - target: x86_64-apple-darwin
            os: macos-latest
            name: herdr-macos-x86_64
          - target: aarch64-apple-darwin
            os: macos-latest
            name: herdr-macos-aarch64
    runs-on: ${{ matrix.os }}
    env:
      LIBGHOSTTY_VT_OPTIMIZE: ReleaseFast
      LIBGHOSTTY_VT_SIMD: 'true'
      HERDR_BUILD_CHANNEL: preview
      HERDR_BUILD_ID: ${{ needs.preflight.outputs.build_id }}
      HERDR_BUILD_COMMIT: ${{ needs.preflight.outputs.commit }}
    steps:
      - uses: actions/checkout@v6
        with:
          ref: ${{ needs.preflight.outputs.commit }}
          persist-credentials: false

      - name: Install Rust
        uses: dtolnay/rust-toolchain@stable
        with:
          targets: ${{ matrix.target }}

      - name: Install Zig
        uses: mlugg/setup-zig@d1434d08867e3ee9daa34448df10607b98908d29 # v2.2.1
        with:
          version: 0.15.2

      - name: Prefer official Ubuntu mirrors over Azure
        if: runner.os == 'Linux'
        run: |
          if [ -f /etc/apt/apt-mirrors.txt ]; then
            sudo sed -i '/azure.archive.ubuntu.com/d' /etc/apt/apt-mirrors.txt
            cat /etc/apt/apt-mirrors.txt
          fi

      - name: Install Linux build tools
        if: runner.os == 'Linux'
        run: sudo apt-get update && sudo apt-get install -y cmake ninja-build musl-tools gcc-aarch64-linux-gnu crossbuild-essential-arm64

      - name: Install macOS build tools
        if: runner.os == 'macOS'
        run: brew install cmake ninja

      - name: Set Linux aarch64 linker
        if: matrix.target == 'aarch64-unknown-linux-musl'
        run: echo "CARGO_TARGET_AARCH64_UNKNOWN_LINUX_MUSL_LINKER=aarch64-linux-gnu-gcc" >> $GITHUB_ENV

      - name: Cache Rust artifacts
        uses: Swatinem/rust-cache@v2
        with:
          key: preview-${{ matrix.target }}

      - name: Remove Zig caches
        run: rm -rf .zig-cache vendor/libghostty-vt/.zig-cache vendor/libghostty-vt/zig-out

      - name: Build
        run: cargo build --release --locked --target ${{ matrix.target }}

      - name: Package artifact
        shell: bash
        run: |
          set -euo pipefail
          cp target/${{ matrix.target }}/release/herdr ${{ matrix.name }}
          if [ "${{ runner.os }}" = "Linux" ]; then
            file ${{ matrix.name }} > BUILD_INFO.txt
            ldd ${{ matrix.name }} > LDD_INFO.txt 2>&1 || true
            cat LDD_INFO.txt >> BUILD_INFO.txt
            grep -Eq "statically linked|not a dynamic executable" LDD_INFO.txt
            if nm -u ${{ matrix.name }} 2>/dev/null | grep -E '(__cxa|GLIBCXX|CXXABI|_ZSt)'; then
              echo "error: Linux artifact has unresolved C++ runtime symbols" >&2
              exit 1
            fi
          else
            file ${{ matrix.name }} > BUILD_INFO.txt
          fi
          python3 - <<'PY' | tee ${{ matrix.name }}.sha256
          import hashlib, pathlib
          path = pathlib.Path('${{ matrix.name }}')
          print(f"{hashlib.sha256(path.read_bytes()).hexdigest()}  {path.name}")
          PY
          {
            echo "commit=${{ needs.preflight.outputs.commit }}"
            echo "build_id=${{ needs.preflight.outputs.build_id }}"
            echo "target=${{ matrix.target }}"
            echo "channel=preview"
          } >> BUILD_INFO.txt

      - name: Upload artifact
        uses: actions/upload-artifact@v7
        with:
          name: ${{ matrix.name }}
          path: |
            ${{ matrix.name }}
            ${{ matrix.name }}.sha256
            BUILD_INFO.txt

  publish:
    needs: [preflight, build]
    if: needs.preflight.outputs.should_publish == 'true'
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - uses: actions/checkout@v6
        with:
          ref: master
          fetch-depth: 0
          persist-credentials: false

      - name: Download all artifacts
        uses: actions/download-artifact@v8
        with:
          path: artifacts

      - name: Generate notes and checksums
        shell: bash
        run: |
          set -euo pipefail
          python3 scripts/preview.py notes \
            --commit '${{ needs.preflight.outputs.commit }}' \
            --build-id '${{ needs.preflight.outputs.build_id }}' \
            --base-version '${{ needs.preflight.outputs.base_version }}' \
            --output PREVIEW_NOTES.md
          python3 - <<'PY'
          import json, pathlib
          result = {}
          for path in pathlib.Path('artifacts').glob('herdr-*/*.sha256'):
              digest, name = path.read_text().split()[:2]
              target = name.removeprefix('herdr-')
              result[target] = digest
          pathlib.Path('preview-sha256.json').write_text(json.dumps(result, indent=2) + '\n')
          PY

      - name: Create preview prerelease
        uses: softprops/action-gh-release@v3
        with:
          tag_name: ${{ needs.preflight.outputs.tag }}
          name: Preview build ${{ needs.preflight.outputs.build_id }}
          body_path: PREVIEW_NOTES.md
          prerelease: true
          make_latest: false
          overwrite_files: true
          target_commitish: ${{ needs.preflight.outputs.commit }}
          files: |
            artifacts/herdr-linux-x86_64/herdr-linux-x86_64
            artifacts/herdr-linux-aarch64/herdr-linux-aarch64
            artifacts/herdr-macos-x86_64/herdr-macos-x86_64
            artifacts/herdr-macos-aarch64/herdr-macos-aarch64

      - name: Update preview manifest
        run: |
          python3 scripts/preview.py manifest \
            --output website/preview.json \
            --tag '${{ needs.preflight.outputs.tag }}' \
            --build-id '${{ needs.preflight.outputs.build_id }}' \
            --commit '${{ needs.preflight.outputs.commit }}' \
            --built-at '${{ needs.preflight.outputs.built_at }}' \
            --base-version '${{ needs.preflight.outputs.base_version }}' \
            --protocol '${{ needs.preflight.outputs.protocol }}' \
            --notes PREVIEW_NOTES.md \
            --sha-file preview-sha256.json \
            --retain 30

      - name: Commit preview manifest
        env:
          KANGAL_GITHUB_TOKEN: ${{ secrets.KANGAL_GITHUB_TOKEN }}
        run: |
          git config user.name "kangal-bot"
          git config user.email "285672167+kangal-bot@users.noreply.github.com"
          git add website/preview.json
          git diff --cached --quiet || git commit -m "docs: update preview manifest"
          git push "https://x-access-token:${KANGAL_GITHUB_TOKEN}@github.com/${GITHUB_REPOSITORY}.git" HEAD:master

      - name: Prune old preview prereleases
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          set -euo pipefail
          gh release list --repo "$GITHUB_REPOSITORY" --limit 100 --json tagName,isPrerelease,createdAt > preview-releases.json
          python3 - <<'PY' > old-preview-tags.txt
          import json
          with open("preview-releases.json", encoding="utf-8") as handle:
              data = json.load(handle)
          releases = [
              release for release in data
              if release.get("isPrerelease") and str(release.get("tagName", "")).startswith("preview-")
          ]
          releases.sort(key=lambda release: str(release.get("createdAt", "")), reverse=True)
          for release in releases[30:]:
              print(release["tagName"])
          PY
          while IFS= read -r tag; do
            [ -n "$tag" ] || continue
            gh release delete "$tag" --repo "$GITHUB_REPOSITORY" --yes --cleanup-tag
          done < old-preview-tags.txt