name: Release

# A pushed plain vX.Y.Z tag publishes the release that every client updates
# from: legacy Win32 clients (v0.5.0 and earlier) through the GitHub API's
# `/releases/latest`, Tauri clients through its `latest.json` asset. A
# dispatch run builds the same assets into a draft, which neither reaches.
# Suffixed tags (vX.Y.Z-suffix) are dispatch-only: both client comparators
# ignore the suffix, so publishing one would ship an rc as a stable update
# and hide the final vX.Y.Z behind it.

on:
  push:
    tags: ['v[0-9]+.[0-9]+.[0-9]+']
  workflow_dispatch:
    inputs:
      tag:
        description: 'Existing tag to build into a draft release (e.g. v0.0.0-test)'
        required: true

permissions:
  contents: read

jobs:
  prepare:
    name: Check the tag and the updater key
    runs-on: ubuntu-latest
    outputs:
      tag: ${{ steps.tag.outputs.tag }}
      version: ${{ steps.tag.outputs.version }}
    steps:
      - uses: actions/checkout@v7
        with:
          ref: ${{ inputs.tag || github.ref }}
          persist-credentials: false

      - name: Verify Cargo.toml version matches tag
        id: tag
        env:
          INPUT_TAG: ${{ inputs.tag }}
        run: |
          if [[ "$GITHUB_REF" == refs/tags/* ]]; then
            tag="${GITHUB_REF#refs/tags/}"
          else
            tag="$INPUT_TAG"
          fi
          if ! [[ "$tag" =~ ^v[0-9]+\.[0-9]+\.[0-9]+(-[0-9A-Za-z.-]+)?$ ]]; then
            echo "::error::Tag '$tag' is not of the form vX.Y.Z or vX.Y.Z-suffix."
            exit 1
          fi
          if [ "$GITHUB_EVENT_NAME" != workflow_dispatch ] && [[ "$tag" == *-* ]]; then
            echo "::error::Tag '$tag' has a suffix; suffixed tags are for draft dispatch runs only and are never published."
            exit 1
          fi
          expected="${tag#v}"
          cargo_version=$(sed -nE 's/^version[[:space:]]*=[[:space:]]*"([^"]+)".*/\1/p' Cargo.toml | head -n 1)
          if [ "$cargo_version" != "$expected" ]; then
            echo "::error::Tag ($tag -> $expected) does not match Cargo.toml version ($cargo_version). Bump Cargo.toml before tagging."
            exit 1
          fi
          echo "Cargo version $cargo_version matches tag $tag"
          echo "tag=$tag" >> "$GITHUB_OUTPUT"
          echo "version=$expected" >> "$GITHUB_OUTPUT"

      # An exe without the updater public key can never verify, and so never
      # install, a later update; every install of it would be stranded.
      # build.rs checks this only for a build that has the signing key in its
      # environment, so check it here, before any build runs.
      - name: Refuse an empty updater public key
        run: |
          pubkey=$(jq -r '.plugins.updater.pubkey // ""' tauri.conf.json)
          if [ -z "${pubkey//[[:space:]]/}" ]; then
            echo "::error::plugins.updater.pubkey in tauri.conf.json is empty: put the updater public key there before releasing."
            exit 1
          fi

  win-x64:
    name: Windows x64
    needs: prepare
    runs-on: windows-latest
    # The updater signing key decides what every installed client will
    # install, so only the steps that check or use it see it: never
    # `npm ci` install scripts, the setup actions or crate build scripts.
    steps:
      - name: Refuse a missing signing key
        shell: bash
        env:
          TAURI_SIGNING_PRIVATE_KEY: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY }}
        run: |
          if [ -z "${TAURI_SIGNING_PRIVATE_KEY//[[:space:]]/}" ]; then
            echo "::error::The TAURI_SIGNING_PRIVATE_KEY secret is empty; an unsigned build cannot be released."
            exit 1
          fi

      - uses: actions/checkout@v7
        with:
          ref: ${{ needs.prepare.outputs.tag }}
          persist-credentials: false

      - uses: dtolnay/rust-toolchain@stable

      - uses: Swatinem/rust-cache@v2

      - uses: actions/setup-node@v7
        with:
          node-version: lts/*
          cache: npm

      - run: npm ci

      # The Windows release is the portable exe; no installer is built.
      - run: npm run tauri build -- --no-bundle -- --locked

      # `signer sign` writes a separate .sig and leaves the exe bytes as
      # built, so the digest GitHub reports for the uploaded exe, which
      # legacy clients verify, is the digest of the file they run.
      - name: Sign the exe
        shell: bash
        env:
          VERSION: ${{ needs.prepare.outputs.version }}
          TAURI_SIGNING_PRIVATE_KEY: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY }}
          TAURI_SIGNING_PRIVATE_KEY_PASSWORD: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY_PASSWORD }}
        run: |
          exe=target/release/usage-monitor.exe
          npx tauri signer sign --app-version "$VERSION" "$exe"
          test -s "$exe.sig"

      - uses: actions/upload-artifact@v7
        with:
          name: release-win-x64
          path: |
            target/release/usage-monitor.exe
            target/release/usage-monitor.exe.sig
          retention-days: 7
          if-no-files-found: error

  linux-x64:
    name: Linux x64
    needs: prepare
    runs-on: ubuntu-22.04
    # As on Windows, only the steps that check or use the signing key see it.
    steps:
      - name: Refuse a missing signing key
        env:
          TAURI_SIGNING_PRIVATE_KEY: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY }}
        run: |
          if [ -z "${TAURI_SIGNING_PRIVATE_KEY//[[:space:]]/}" ]; then
            echo "::error::The TAURI_SIGNING_PRIVATE_KEY secret is empty; an unsigned build cannot be released."
            exit 1
          fi

      - uses: actions/checkout@v7
        with:
          ref: ${{ needs.prepare.outputs.tag }}
          persist-credentials: false

      - uses: dtolnay/rust-toolchain@stable

      - uses: Swatinem/rust-cache@v2

      - uses: actions/setup-node@v7
        with:
          node-version: lts/*
          cache: npm

      - name: Install Linux build prerequisites
        run: |
          sudo apt-get update
          sudo apt-get install -y libwebkit2gtk-4.1-dev build-essential curl wget file \
            libxdo-dev libssl-dev libayatana-appindicator3-dev librsvg2-dev patchelf

      - run: npm ci

      # Compile without the key, then bundle and sign with it: `tauri bundle`
      # packages the binary already built and runs no cargo build scripts.
      - run: npm run tauri build -- --no-bundle -- --locked

      - name: Bundle the AppImage and deb with updater signatures
        env:
          TAURI_SIGNING_PRIVATE_KEY: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY }}
          TAURI_SIGNING_PRIVATE_KEY_PASSWORD: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY_PASSWORD }}
        run: >-
          npm run tauri bundle --
          --bundles appimage,deb
          --config '{"bundle":{"createUpdaterArtifacts":true}}'

      # The bundler names outputs after productName, which has spaces, and
      # GitHub rewrites spaces in asset names, so the URLs in latest.json
      # would no longer match. A signature covers the content, not the name.
      - name: Rename the bundles to space-free names
        env:
          VERSION: ${{ needs.prepare.outputs.version }}
        run: |
          set -euo pipefail
          shopt -s nullglob
          one() {
            if [ "$#" -ne 1 ]; then
              echo "::error::Expected exactly one bundle, found $#: $*" >&2
              return 1
            fi
            printf '%s' "$1"
          }
          appimage=$(one target/release/bundle/appimage/*_amd64.AppImage)
          deb=$(one target/release/bundle/deb/*_amd64.deb)
          name="usage-monitor_${VERSION}_amd64"
          mkdir -p dist
          cp "$appimage" "dist/$name.AppImage"
          cp "$appimage.sig" "dist/$name.AppImage.sig"
          cp "$deb" "dist/$name.deb"
          test -s "dist/$name.AppImage.sig"
          ls -l dist

      - uses: actions/upload-artifact@v7
        with:
          name: release-linux-x64
          path: dist/
          retention-days: 7
          if-no-files-found: error

  publish:
    name: Publish
    needs: [prepare, win-x64, linux-x64]
    runs-on: ubuntu-latest
    permissions:
      contents: write
    env:
      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      TAG: ${{ needs.prepare.outputs.tag }}
    steps:
      - uses: actions/checkout@v7
        with:
          ref: ${{ needs.prepare.outputs.tag }}
          persist-credentials: false

      - uses: actions/setup-node@v7
        with:
          node-version: lts/*

      - uses: actions/download-artifact@v8
        with:
          pattern: release-*
          path: dist
          merge-multiple: true

      - name: Write latest.json and check the asset set
        run: node scripts/make-latest-json.js "$TAG" dist

      # Legacy clients read only `/releases/latest`, so a tag release must be
      # a non-draft, non-prerelease release marked latest.
      - name: Create the release
        run: |
          if [ "$GITHUB_EVENT_NAME" = workflow_dispatch ]; then
            mode=(--draft)
          else
            mode=(--latest)
          fi
          gh release create "$TAG" dist/* --verify-tag --title "$TAG" --generate-notes "${mode[@]}"

      - name: Check that /releases/latest is this release
        if: github.event_name != 'workflow_dispatch'
        run: |
          latest=$(gh api "repos/$GITHUB_REPOSITORY/releases/latest" -q .tag_name)
          if [ "$latest" != "$TAG" ]; then
            echo "::error::/releases/latest returns $latest, not $TAG; legacy clients would not see this release."
            exit 1
          fi