name: CI / Rust
on:
  workflow_call:
    inputs:
      rust:
        required: true
        type: boolean
      desktop_rust:
        required: true
        type: boolean
      lane:
        required: true
        type: string
    outputs:
      rust_lint_result:
        value: ${{ jobs.results.outputs.rust_lint_result }}
      unit_tests_result:
        value: ${{ jobs.results.outputs.unit_tests_result }}
      windows_rust_result:
        value: ${{ jobs.results.outputs.windows_rust_result }}

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

jobs:
  rust-lint:
    name: Rust Lint
    runs-on: ubuntu-latest
    timeout-minutes: 30
    if: inputs.lane == 'required' && (github.event_name == 'push' || inputs.rust || inputs.desktop_rust)
    permissions:
      contents: read
    steps:
      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
      - uses: cashapp/activate-hermit@cea9af7913204a965fd488637a8d1811bba2e616 # v1
      - uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32
        with:
          save-if: ${{ github.event_name != 'pull_request' }}
      - name: Format check
        run: just fmt-check
      - name: Desktop Tauri format check
        run: just desktop-tauri-fmt-check
      - name: Clippy
        run: just clippy

  unit-tests:
    name: Unit Tests
    runs-on: ubuntu-latest
    timeout-minutes: 30
    if: inputs.lane == 'required' && (github.event_name == 'push' || inputs.rust)
    permissions:
      contents: read
    steps:
      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
      - uses: cashapp/activate-hermit@cea9af7913204a965fd488637a8d1811bba2e616 # v1
      - uses: rui314/setup-mold@7e4f20ad28a2e8ca6fd0892ccf72e2abb706b9c3 # v1
      - uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32
        with:
          key: sherpa-cache-v1
          save-if: ${{ github.event_name != 'pull_request' }}
      - name: Install cargo-nextest
        uses: taiki-e/install-action@0fd46367812ee04360509b4169d9f659d6892bb2 # v2.79.15
        with:
          tool: cargo-nextest@0.9.136
      - name: Unit tests
        run: just test-unit

  server-cross-compile:
    name: Server Cross-Compile
    runs-on: ubuntu-latest
    timeout-minutes: 30
    if: inputs.lane == 'cross-compile' && (github.event_name == 'push' || inputs.rust)
    permissions:
      contents: read
    strategy:
      fail-fast: false
      matrix:
        target:
          - x86_64-unknown-linux-musl
          - aarch64-unknown-linux-musl
    steps:
      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
      - uses: cashapp/activate-hermit@cea9af7913204a965fd488637a8d1811bba2e616 # v1
      - uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32
        with:
          key: cross-${{ matrix.target }}
          save-if: ${{ github.event_name != 'pull_request' }}
      - name: Install cross
        uses: taiki-e/install-action@0fd46367812ee04360509b4169d9f659d6892bb2 # v2.79.15
        with:
          tool: cross@0.2.5
      - name: Build server binaries
        env:
          TARGET: ${{ matrix.target }}
          # PRs: compile + build-script gate only (no codegen/link). Main: full link gate.
          CARGO_CMD: ${{ github.event_name == 'pull_request' && 'check' || 'build' }}
        run: |
          cross "$CARGO_CMD" --release --target "$TARGET" \
            -p buzz-relay \
            -p buzz-acp \
            -p buzz-agent \
            -p buzz-dev-mcp \
            -p git-credential-nostr \
            -p git-sign-nostr

  windows-rust:
    name: Windows Rust (x86_64-pc-windows-msvc)
    runs-on: windows-latest
    # Windows runners are slow and this compiles the workspace + Tauri crate
    # cold across four steps; budget generously.
    timeout-minutes: 45
    if: inputs.lane == 'required' && (github.event_name == 'push' || inputs.rust || inputs.desktop_rust)
    permissions:
      contents: read
    env:
      TARGET: x86_64-pc-windows-msvc
    steps:
      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
      # MSVC needs windows.h (aws-lc-sys et al.), so this runs on a real Windows
      # runner — hermit, used by the Linux jobs, does not provide MSVC. The
      # toolchain (1.95.0 + clippy via profile = default) comes from the
      # repo-root rust-toolchain.toml, which the runner's preinstalled rustup
      # honors on demand; the host triple already is x86_64-pc-windows-msvc.
      - uses: Swatinem/rust-cache@e18b497796c12c097a38f9edb9d0641fb99eee32
        with:
          workspaces: |
            .
            desktop/src-tauri
          key: windows-msvc
          save-if: ${{ github.event_name != 'pull_request' }}
      # Tauri validates externalBin at compile time, so the Tauri-crate steps
      # below fail without these stubs. Mirrors scripts/bundle-sidecars.sh's
      # Windows naming (binaries/<bin>-<triple>.exe); empty files suffice for a
      # type-check since nothing executes them.
      - name: Create sidecar placeholders
        shell: bash
        run: |
          mkdir -p desktop/src-tauri/binaries
          for bin in buzz-acp buzz-agent buzz-dev-mcp git-credential-nostr buzz; do
            touch "desktop/src-tauri/binaries/${bin}-${TARGET}.exe"
          done
      - name: Clippy (workspace)
        run: cargo clippy --workspace --all-targets --target $env:TARGET -- -D warnings
      - name: Check (workspace)
        run: cargo check --workspace --all-targets --target $env:TARGET
      - name: Test (buzz-dev-mcp)
        # The Windows-only bash resolver lives in buzz-dev-mcp; its unit tests
        # only gate if this crate is tested ON Windows.
        # Serial: windows_resolver_tests mutate process-global env
        # (BUZZ_SHELL/GIT_BASH/SystemRoot) that SharedState::new reads.
        run: cargo test -p buzz-dev-mcp --target $env:TARGET -- --test-threads=1
      - name: Test (ACP launch-prefix platform contract)
        # Execute the non-Unix refusal branch; a cross-compile cannot test it.
        run: cargo test -p buzz-acp --target $env:TARGET --lib acp::launch::platform_tests
      - name: Test (buzz-agent auth coordinator)
        # The auth coordinator single-flights on an OS advisory lock, which is
        # LockFileEx on Windows; this integration suite drives real second
        # processes on the same lock file, so it only exercises the Windows
        # lock runtime if it runs ON Windows. Every other job compiles it but
        # never executes it. Tests exercised on Windows: lock serialization
        # (two coordinators race for the same key), cooldown sidecar sharing
        # across processes, attempt-sidecar adoption (UserInitiated waiter
        # adopts a predecessor's denial), and the in-process single-flight for
        # same-key coalescing. Tests that are UNIX-ONLY and NOT executed here:
        # crash-release (flock drop on SIGKILL, guarded by #[cfg(unix)]) and
        # cross-process cache success/race (on-disk token handoff, also
        # #[cfg(unix)]).
        run: cargo test -p buzz-agent --target $env:TARGET --test databricks_auth_coordinator
      # Smoke-test the new host-prereq contract: Git for Windows (which provides
      # bash) is available on the runner, a shell command round-trips, and bash
      # does NOT resolve from System32 (so WSL's launcher is never picked up).
      # windows-latest runners have Git for Windows pre-installed; the unit tests
      # above exercise the MCP resolver itself. This step verifies the host env.
      - name: Smoke-test host Git Bash prereq (host env check)
        shell: bash
        run: |
          set -euo pipefail
          # Git for Windows ships bash.exe under its bin/ directory; confirm it
          # resolves from the standard location the runtime resolver probes first.
          bash_path=$(command -v bash 2>/dev/null || true)
          [[ -n "$bash_path" ]] || { echo "ERROR: bash not found on PATH — host Git for Windows missing" >&2; exit 1; }
          echo "Resolved bash: $bash_path"
          [[ "$bash_path" != *System32* ]] || { echo "ERROR: resolved bash is WSL's System32 launcher" >&2; exit 1; }

          # Run a basic pipeline through the resolved bash (same invocation the
          # agent uses: bash -c '...').
          out=$(bash -c 'echo hello | tr a-z A-Z')
          [[ "$out" == "HELLO" ]] || { echo "bash pipeline failed: got '$out'" >&2; exit 1; }

          # Confirm git itself works — agents run git commands frequently.
          git --version
          repo=$(mktemp -d)
          cd "$repo"
          git init -q
          git -c user.name=ci -c user.email=ci@example.com commit -q --allow-empty -m smoke
          git log -1 --format=%s | grep -qx smoke
          echo "Host bash resolved and functional; git commit round-trip passed"
      - name: Check (Tauri crate)
        run: cargo check --manifest-path desktop/src-tauri/Cargo.toml --workspace --all-targets --target $env:TARGET
        env:
          CMAKE_POLICY_VERSION_MINIMUM: "3.5"
      - name: Test (Tauri crate)
        run: cargo test --manifest-path desktop/src-tauri/Cargo.toml --target $env:TARGET
        env:
          CMAKE_POLICY_VERSION_MINIMUM: "3.5"


  results:
    name: Results
    if: ${{ always() }}
    needs: [rust-lint, unit-tests, server-cross-compile, windows-rust]
    runs-on: ubuntu-latest
    timeout-minutes: 5
    permissions: {}
    outputs:
      rust_lint_result: ${{ needs.rust-lint.result }}
      unit_tests_result: ${{ needs.unit-tests.result }}
      windows_rust_result: ${{ needs.windows-rust.result }}
    steps:
      - run: echo "Captured Rust job results"