name: CI

on:
  push:
    branches: [ main, develop ]
  pull_request:
    branches: [ main ]

env:
  CARGO_TERM_COLOR: always
  RUST_BACKTRACE: 1

# ── What this file may assume about where it runs ────────────────────────────
#
# It runs on ONE self-hosted runner: `rpi5-runner`, aarch64, advertising
# ["ubuntu-latest", "ubuntu-24.04", "ubuntu-22.04"]. Nothing else exists.
#
# This file was written for GitHub's hosted fleet — three operating systems and
# x86_64 throughout — and had never once gone green here: 23 runs cancelled, 2
# waiting, zero successes. Two separate reasons, and both are configuration
# describing a world that is not this one:
#
#   * `windows-latest` / `macos-latest` match no runner label, so those jobs sit
#     in WAITING for ever. The run therefore never reaches a terminal state, and
#     a pull request's checks never resolve either way — not red, just never
#     finished. That is worse than a failure: a red check tells you something.
#   * `--target x86_64-unknown-linux-gnu` on an aarch64 host makes every build a
#     cross-compile, and `wayland-sys`'s build script dies on it —
#     "pkg-config has not been configured to support cross-compilation".
#
# So: one job, on the machine that exists, building for the machine that exists.
# If a second architecture is ever wanted here it needs a second RUNNER, not a
# second matrix row.

jobs:
  # ── Native build, on the one runner there is ────────────────────────────────
  native:
    name: Native — linux
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4

      - name: Install Rust toolchain
        # `stable` installs a MINIMAL profile: rustc, cargo, rust-std and no
        # more. Components have to be named. Without this line the Clippy step
        # below dies on "'cargo-clippy' is not installed for the toolchain
        # 'stable-aarch64-unknown-linux-gnu'" — which is not a lint result, it
        # is the step never having run. The `fmt` job below always got this
        # right; this one never did.
        uses: dtolnay/rust-toolchain@stable
        with:
          components: clippy

      - name: Cache Cargo registry and build
        uses: Swatinem/rust-cache@v2

      # Linux: install Bevy's system dependencies (X11, Wayland, audio)
      - name: Install Linux system dependencies
        run: |
          sudo apt-get update
          sudo apt-get install -y \
            libasound2-dev \
            libudev-dev \
            libwayland-dev \
            libxkbcommon-dev \
            libx11-dev \
            libxi-dev \
            pkg-config

      - name: Check (fast compile check)
        run: cargo check --workspace

      - name: Build (debug)
        run: cargo build --workspace

      - name: Run tests
        run: cargo test --workspace

      # This step has never once executed on this codebase: the toolchain above
      # shipped without the component, so every run died on "not installed"
      # before clippy saw a line of source. Its result was never pass or fail,
      # only unmeasured. With the component installed it becomes a real check,
      # and the first honest thing it will report is that the workspace is not
      # clean — the build already emits ~13 plain rustc warnings (unused
      # imports, unused variables, needless `mut`, dead fields) that
      # `-D warnings` promotes to errors, before clippy's own lints are counted.
      #
      # Left gating on purpose. A red check that measures something is worth
      # more than a green one that measures nothing, and the alternative —
      # `continue-on-error`, or dropping `-D warnings` — cannot tell "debt not
      # yet paid" from "debt paid", which is the shape PROTOCOL.md forbids.
      # The debt is scoped in #13, as the rustfmt debt is in #12.
      - name: Clippy
        run: cargo clippy --workspace -- -D warnings

  # ── WASM / Web build ─────────────────────────────────────────────────────────
  wasm:
    name: WASM — Web
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4

      - name: Install Rust toolchain + WASM target
        uses: dtolnay/rust-toolchain@stable
        with:
          targets: wasm32-unknown-unknown

      - name: Cache Cargo
        uses: Swatinem/rust-cache@v2

      - name: Install Trunk
        uses: jetli/trunk-action@v0.5.0

      - name: Check WASM compile
        run: >
          cargo check
          --target wasm32-unknown-unknown
          -p sylpheed-viewer
          -p sylpheed-formats

      - name: Build WASM release with Trunk
        run: trunk build --release

      - name: Upload WASM dist artifact
        uses: actions/upload-artifact@v4
        with:
          name: web-dist
          path: dist/

  # ── Format check ─────────────────────────────────────────────────────────────
  fmt:
    name: Formatting
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: dtolnay/rust-toolchain@stable
        with:
          components: rustfmt
      - run: cargo fmt --all -- --check