name: CI / Flake Check
on:
  workflow_call:

env:
  CARGO_TERM_COLOR: always
  BUZZ_TEST_POSTGRES_PASSWORD: buzz_dev
  PLAYWRIGHT_BROWSERS_PATH: ${{ github.workspace }}/.cache/ms-playwright

# Advisory flake check: repeat the tests a pull request changes, ten times
# each with retries off, so a race inside a test surfaces before it lands on
# main. The lanes skip when no test changed, so they stay out of the required
# checks in ci.yml (whose gates reject skipped lanes); their own statuses and
# step summaries carry the result. Selections reach the lanes through env
# vars, never interpolated into run scripts; flake-check.mjs admits only plain
# path and identifier characters.
jobs:
  flake-select:
    name: Flake check selection
    runs-on: ubuntu-latest
    timeout-minutes: 10
    permissions:
      contents: read
    outputs:
      rust: ${{ steps.select.outputs.rust }}
      tauri: ${{ steps.select.outputs.tauri }}
      node: ${{ steps.select.outputs.node }}
      playwright: ${{ steps.select.outputs.playwright }}
      playwright_shards: ${{ steps.select.outputs.playwright_shards }}
      playwright_shard_total: ${{ steps.select.outputs.playwright_shard_total }}
      dart: ${{ steps.select.outputs.dart }}
    steps:
      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
        with:
          # The merge commit's first parent is the base branch tip, so this
          # diff is exactly the pull request's change without a full clone.
          fetch-depth: 2
      - uses: cashapp/activate-hermit@cea9af7913204a965fd488637a8d1811bba2e616 # v1
      # Only a changed spec needs desktop dependencies: Playwright lists its
      # smoke journeys and the desktop app's TypeScript parses it. Pull
      # requests without one skip the install.
      - name: Check for changed Playwright specs
        id: specs
        run: |
          if git diff --quiet --diff-filter=AM HEAD^1 HEAD -- 'desktop/tests/e2e/*.spec.ts'; then
            echo "changed=false" >> "$GITHUB_OUTPUT"
          else
            echo "changed=true" >> "$GITHUB_OUTPUT"
          fi
      - name: Get pnpm store directory
        if: steps.specs.outputs.changed == 'true'
        id: pnpm-cache
        run: echo "STORE_PATH=$(pnpm store path --silent)" >> "$GITHUB_OUTPUT"
      - name: Restore pnpm store cache
        if: steps.specs.outputs.changed == 'true'
        uses: actions/cache/restore@caa296126883cff596d87d8935842f9db880ef25 # v5
        with:
          path: ${{ steps.pnpm-cache.outputs.STORE_PATH }}
          key: pnpm-${{ runner.os }}-${{ hashFiles('**/pnpm-lock.yaml') }}
          restore-keys: pnpm-${{ runner.os }}-
      - name: Install desktop dependencies
        if: steps.specs.outputs.changed == 'true'
        run: just desktop-install-ci
      - name: Map changed hunks to tests
        id: select
        run: node scripts/flake-check.mjs select HEAD^1 HEAD

  flake-rust:
    name: Flake check (Rust)
    needs: [flake-select]
    if: needs.flake-select.outputs.rust != ''
    runs-on: ubuntu-latest
    timeout-minutes: 30
    permissions:
      contents: read
    steps:
      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
      - uses: cashapp/activate-hermit@cea9af7913204a965fd488637a8d1811bba2e616 # v1
      - uses: rui314/setup-mold@339e96b4ff1f3bd865856ba4cbbe8818a7acb038 # v1
      # Restores the Unit Tests lane's cache (_ci-rust.yml) read-only; this
      # lane never saves one of its own. The restore only hits while the cache
      # key matches: the same shared-key, and rust-cache's environment hash —
      # the CARGO*/RUST*/CC* environment variables, the lockfiles and the rustc
      # version — must stay identical to the Unit Tests job's, so any env this
      # job sets must be set there too (scripts/test-rust-cache-contract.sh
      # checks the key).
      - uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32
        with:
          shared-key: unit-tests-sherpa-cache-v1
          save-if: false
      - name: Install cargo-nextest
        uses: taiki-e/install-action@0fd46367812ee04360509b4169d9f659d6892bb2 # v2.79.15
        with:
          tool: cargo-nextest@0.9.136
      # nextest has no repeat flag; the script runs the selection once per
      # iteration under the `flake` profile (.config/nextest.toml).
      - name: Repeat changed Rust tests
        env:
          SELECTED: ${{ needs.flake-select.outputs.rust }}
        run: node scripts/flake-check.mjs rust --iterations=10 $SELECTED
      - name: Rust iteration reports
        if: ${{ !cancelled() }}
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: flake-rust
          path: test-results/flake
          if-no-files-found: ignore
          retention-days: 7

  flake-tauri:
    name: Flake check (Desktop Tauri)
    needs: [flake-select]
    if: needs.flake-select.outputs.tauri != ''
    runs-on: ubuntu-latest
    # Same bound as a Desktop Tauri lane (_ci-desktop.yml): ci-apt-retry.sh
    # bounds the apt step at ~34m worst case and a cold build needs ~15m.
    timeout-minutes: 55
    permissions:
      contents: read
    steps:
      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
      - uses: cashapp/activate-hermit@cea9af7913204a965fd488637a8d1811bba2e616 # v1
      - uses: rui314/setup-mold@339e96b4ff1f3bd865856ba4cbbe8818a7acb038 # v1
      # Restores the Desktop Tauri core lane's cache (_ci-desktop.yml)
      # read-only, under the same constraints as flake-rust's restore above:
      # the workspace, shared-key and environment hash must stay identical to
      # that job's.
      - uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32
        with:
          workspaces: desktop/src-tauri
          shared-key: desktop-core
          save-if: false
      - name: Install Tauri dependencies (Linux)
        env:
          DEBIAN_FRONTEND: noninteractive
        run: |
          CI_APT_ATTEMPT_SECONDS=90 scripts/ci-apt-retry.sh sudo apt-get update
          scripts/ci-apt-retry.sh sudo apt-get install -y --no-install-recommends \
            build-essential \
            curl \
            file \
            libasound2-dev \
            libayatana-appindicator3-dev \
            libgtk-3-dev \
            librsvg2-dev \
            libssl-dev \
            libwebkit2gtk-4.1-dev \
            libxdo-dev \
            patchelf \
            wget
      - name: Install cargo-nextest
        uses: taiki-e/install-action@0fd46367812ee04360509b4169d9f659d6892bb2 # v2.79.15
        with:
          tool: cargo-nextest@0.9.136
      # tauri-build validates the sidecar binaries at compile time; the Desktop
      # Tauri recipes create the same empty stubs.
      - name: Create sidecar stubs
        run: just _ensure-sidecar-stubs
      # Same script as flake-rust, against the Tauri workspace's manifest and
      # its own .config/nextest.toml `flake` profile.
      - name: Repeat changed desktop Tauri tests
        env:
          CMAKE_POLICY_VERSION_MINIMUM: "3.5"
          SELECTED: ${{ needs.flake-select.outputs.tauri }}
        run: node scripts/flake-check.mjs tauri --iterations=10 $SELECTED
      - name: Desktop Tauri iteration reports
        if: ${{ !cancelled() }}
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: flake-tauri
          path: test-results/flake
          if-no-files-found: ignore
          retention-days: 7

  flake-node:
    name: Flake check (node:test)
    needs: [flake-select]
    if: needs.flake-select.outputs.node != ''
    runs-on: ubuntu-latest
    timeout-minutes: 15
    permissions:
      contents: read
    steps:
      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
      - uses: cashapp/activate-hermit@cea9af7913204a965fd488637a8d1811bba2e616 # v1
      - name: Get pnpm store directory
        id: pnpm-cache
        run: echo "STORE_PATH=$(pnpm store path --silent)" >> "$GITHUB_OUTPUT"
      - name: Restore pnpm store cache
        uses: actions/cache/restore@caa296126883cff596d87d8935842f9db880ef25 # v5
        with:
          path: ${{ steps.pnpm-cache.outputs.STORE_PATH }}
          key: pnpm-${{ runner.os }}-${{ hashFiles('**/pnpm-lock.yaml') }}
          restore-keys: pnpm-${{ runner.os }}-
      - name: Install desktop dependencies
        run: just desktop-install-ci
      - name: Repeat changed node:test files
        env:
          SELECTED: ${{ needs.flake-select.outputs.node }}
        run: node scripts/flake-check.mjs node --iterations=10 $SELECTED
      - name: node:test iteration logs
        if: ${{ !cancelled() }}
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: flake-node
          path: test-results/flake
          if-no-files-found: ignore
          retention-days: 7

  flake-playwright:
    name: Flake check (Playwright smoke, ${{ matrix.shard }}/${{ needs.flake-select.outputs.playwright_shard_total }})
    needs: [flake-select]
    if: needs.flake-select.outputs.playwright != ''
    runs-on: ubuntu-latest
    # Same bound as a smoke shard: Chromium dependency setup is bounded by
    # ci-apt-retry.sh (~25m worst case), and flake-check.mjs sizes the shards
    # so the repetitions fit the rest.
    timeout-minutes: 45
    strategy:
      fail-fast: false
      matrix:
        shard: ${{ fromJSON(needs.flake-select.outputs.playwright_shards) }}
    permissions:
      contents: read
    steps:
      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
      - uses: cashapp/activate-hermit@cea9af7913204a965fd488637a8d1811bba2e616 # v1
      - name: Get pnpm store directory
        id: pnpm-cache
        run: echo "STORE_PATH=$(pnpm store path --silent)" >> "$GITHUB_OUTPUT"
      - name: Restore pnpm store cache
        uses: actions/cache/restore@caa296126883cff596d87d8935842f9db880ef25 # v5
        with:
          path: ${{ steps.pnpm-cache.outputs.STORE_PATH }}
          key: pnpm-${{ runner.os }}-${{ hashFiles('**/pnpm-lock.yaml') }}
          restore-keys: pnpm-${{ runner.os }}-
      - name: Install desktop dependencies
        run: just desktop-install-ci
      - name: Get Playwright version
        id: pw-version
        run: echo "version=$(cd desktop && node -e "console.log(require('@playwright/test/package.json').version)")" >> "$GITHUB_OUTPUT"
      - name: Restore Playwright browser cache
        id: playwright-cache
        uses: actions/cache/restore@caa296126883cff596d87d8935842f9db880ef25 # v5
        with:
          path: ${{ env.PLAYWRIGHT_BROWSERS_PATH }}
          key: playwright-${{ runner.os }}-${{ steps.pw-version.outputs.version }}
      - name: Install Playwright Chromium
        if: steps.playwright-cache.outputs.cache-hit != 'true'
        run: cd desktop && pnpm exec playwright install chromium
      - name: Install Playwright system dependencies
        run: cd desktop && ../scripts/ci-apt-retry.sh pnpm exec playwright install-deps chromium
      - name: Desktop E2E build
        run: pnpm -C desktop build:e2e
      # --retries=0 overrides the config's CI retries, so every failed
      # repetition reports as unexpected and fails the step.
      - name: Repeat changed smoke journeys
        env:
          PLAYWRIGHT_JSON_OUTPUT_FILE: playwright-report.json
          SELECTED: ${{ needs.flake-select.outputs.playwright }}
          SHARD: ${{ matrix.shard }}
          SHARD_TOTAL: ${{ needs.flake-select.outputs.playwright_shard_total }}
        run: cd desktop && pnpm exec playwright test --project=smoke --repeat-each=10 --retries=0 --shard="$SHARD/$SHARD_TOTAL" --reporter=list,json $SELECTED
      - name: Summarize repetitions
        if: ${{ !cancelled() }}
        env:
          SHARD: ${{ matrix.shard }}
          SHARD_TOTAL: ${{ needs.flake-select.outputs.playwright_shard_total }}
        run: node scripts/flake-check.mjs playwright-summary desktop/playwright-report.json "Flake check (Playwright smoke, $SHARD/$SHARD_TOTAL)"
      - name: Playwright repetition artifacts
        if: ${{ !cancelled() }}
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: flake-playwright-${{ matrix.shard }}
          path: |
            desktop/playwright-report.json
            desktop/test-results
          if-no-files-found: ignore
          retention-days: 7

  flake-dart:
    name: Flake check (Flutter)
    needs: [flake-select]
    if: needs.flake-select.outputs.dart != ''
    runs-on: ubuntu-latest
    timeout-minutes: 30
    permissions:
      contents: read
    steps:
      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
      - uses: cashapp/activate-hermit@cea9af7913204a965fd488637a8d1811bba2e616 # v1
      # Restores the Mobile lane's Hermit and pub caches read-only; that lane
      # saves them.
      - name: Compute Hermit cache key
        id: hermit-bin-hash
        run: |
          hash="$(find ./bin ! -type d | sort | xargs openssl sha256 | openssl sha256 -r | cut -d' ' -f1)"
          echo "hash=$hash" >> "$GITHUB_OUTPUT"
      - name: Restore Hermit package cache
        uses: actions/cache/restore@caa296126883cff596d87d8935842f9db880ef25 # v5
        with:
          path: ~/.cache/hermit/pkg
          key: ${{ runner.os }}-hermit-cache-${{ steps.hermit-bin-hash.outputs.hash }}
          restore-keys: ${{ runner.os }}-hermit-cache-
      - name: Prime Flutter SDK
        run: flutter --version
      - name: Restore pub cache
        uses: actions/cache/restore@caa296126883cff596d87d8935842f9db880ef25 # v5
        with:
          path: ~/.pub-cache
          key: pub-${{ runner.os }}-${{ hashFiles('mobile/pubspec.lock') }}
          restore-keys: pub-${{ runner.os }}-
      - name: Install dependencies
        run: cd mobile && flutter pub get
      - name: Repeat changed Flutter tests
        env:
          SELECTED: ${{ needs.flake-select.outputs.dart }}
        run: node scripts/flake-check.mjs dart --iterations=10 $SELECTED
      - name: Flutter iteration reports
        if: ${{ !cancelled() }}
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: flake-dart
          path: test-results/flake
          if-no-files-found: ignore
          retention-days: 7