name: CI

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

permissions:
  contents: read
  pull-requests: write

env:
  CARGO_TERM_COLOR: always

jobs:
  fmt:
    name: Format
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
      - name: Install Rust
        run: |
          rustup override set stable
          rustup update stable
          rustup component add rustfmt
      - run: cargo fmt --all --check

  clippy:
    name: Clippy
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
      - name: Install Rust
        run: |
          rustup override set stable
          rustup update stable
          rustup component add clippy
      - uses: Swatinem/rust-cache@v2
      - run: cargo clippy --all-targets --all-features -- -D warnings

  test:
    name: Test
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
      - name: Install Rust
        run: |
          rustup override set stable
          rustup update stable
      - uses: Swatinem/rust-cache@v2
      - name: Run tests
        run: cargo test --verbose --all-features --all-targets
      - name: Run doc tests
        run: cargo test --verbose --all-features --doc

  examples:
    name: Examples
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
      - name: Install Rust
        run: |
          rustup override set stable
          rustup update stable
      - uses: Swatinem/rust-cache@v2
      - name: Run basic_optimization
        run: cargo run --example basic_optimization
      - name: Run parameter_types
        run: cargo run --example parameter_types --features derive
      - name: Run sampler_comparison
        run: cargo run --example sampler_comparison
      - name: Run pruning
        run: cargo run --example pruning
      - name: Run early_stopping
        run: cargo run --example early_stopping
      - name: Run async_parallel
        run: cargo run --example async_parallel --features async
      - name: Run journal_storage
        run: cargo run --example journal_storage --features journal
      - name: Run ask_and_tell
        run: cargo run --example ask_and_tell
      - name: Run multi_objective
        run: cargo run --example multi_objective

  docs:
    name: Docs
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
      - name: Install Rust
        run: |
          rustup override set stable
          rustup update stable
      - uses: Swatinem/rust-cache@v2
      - run: cargo doc --all-features --no-deps
        env:
          RUSTDOCFLAGS: -D warnings

  feature-check:
    name: Feature Combinations (${{ matrix.partition }}/4)
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        partition: [1, 2, 3, 4]
    steps:
      - uses: actions/checkout@v6
      - name: Install Rust
        run: |
          rustup override set stable
          rustup update stable
      - name: Install cargo-hack
        uses: taiki-e/install-action@cargo-hack
      - uses: Swatinem/rust-cache@v2
      - name: Check feature powerset
        run: cargo hack check --feature-powerset --no-dev-deps --partition ${{ matrix.partition }}/4

  coverage:
    name: Coverage
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
      - name: Install Rust
        run: |
          rustup override set stable
          rustup update stable
          rustup component add llvm-tools-preview
      - name: Install cargo-llvm-cov
        uses: taiki-e/install-action@cargo-llvm-cov
      - uses: Swatinem/rust-cache@v2
      - name: Generate coverage report
        run: cargo llvm-cov --all-features --lcov --output-path lcov.info
      - name: Upload coverage to Codecov
        uses: codecov/codecov-action@v5
        with:
          token: ${{ secrets.CODECOV_TOKEN }}
          files: lcov.info
          fail_ci_if_error: true

  msrv:
    name: MSRV (1.89)
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
      - name: Install Rust 1.89
        run: |
          rustup override set 1.89
          rustup update 1.89
      - uses: Swatinem/rust-cache@v2
      - name: Check compilation
        run: cargo check --all-features

  deny:
    name: Cargo Deny
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
      - uses: EmbarkStudios/cargo-deny-action@v2

  machete:
    name: Unused Dependencies
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
      - name: Install Rust
        run: |
          rustup override set stable
          rustup update stable
      - uses: Swatinem/rust-cache@v2
      - name: Machete
        uses: bnjbvr/cargo-machete@7959c845782fed02ee69303126d4a12d64f1db18

  semver:
    name: Semver Check
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
      - name: Install Rust
        run: |
          rustup override set stable
          rustup update stable
      - uses: Swatinem/rust-cache@v2
      - name: Install cargo-semver-checks
        uses: taiki-e/install-action@cargo-semver-checks
      - name: Check semver
        run: cargo semver-checks check-release

  minimal-versions:
    name: Minimal Versions
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
      - name: Install Rust nightly
        run: |
          rustup toolchain install nightly
          rustup override set nightly
      - uses: Swatinem/rust-cache@v2
      - name: Generate minimal version lockfile
        run: cargo +nightly -Z minimal-versions update
      - name: Install Rust stable
        run: |
          rustup override set stable
          rustup update stable
      - name: Check with minimal versions
        run: cargo check --all-features --locked

  cross-platform:
    name: ${{ matrix.os }}
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        os: [windows-latest, macos-latest]
    steps:
      - uses: actions/checkout@v6
      - name: Install Rust
        run: |
          rustup override set stable
          rustup update stable
      - uses: Swatinem/rust-cache@v2
      - name: Check compilation
        run: cargo check --all-features
      - name: Run tests
        run: cargo test --all-features

  cross-targets:
    name: ${{ matrix.target }}
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        target:
          - aarch64-unknown-linux-gnu
          - i686-unknown-linux-gnu
          - powerpc64le-unknown-linux-gnu
          - s390x-unknown-linux-gnu
    steps:
      - uses: actions/checkout@v6
      - name: Install Rust
        run: |
          rustup override set stable
          rustup update stable
          rustup target add ${{ matrix.target }}
      - uses: Swatinem/rust-cache@v2
      - name: Check compilation
        run: cargo check --all-features --target ${{ matrix.target }}

  typos:
    name: Typos
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
      - name: Install Rust
        run: |
          rustup override set stable
          rustup update stable
      - uses: taiki-e/cache-cargo-install-action@v3
        with:
          tool: typos-cli
      - name: Typos Check
        run: typos src/

  bench-check:
    name: Benchmark Smoke Test
    if: github.event_name == 'push'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
      - name: Install Rust
        run: |
          rustup override set stable
          rustup update stable
      - uses: Swatinem/rust-cache@v2
      - name: Run benchmarks (smoke test)
        run: cargo bench --all-features --bench samplers --bench optimization

  bench-compare:
    name: Benchmark Comparison
    if: github.event_name == 'pull_request'
    runs-on: ubuntu-latest
    steps:
      - name: Install Rust
        run: |
          rustup override set stable
          rustup update stable

      - name: Install critcmp
        run: cargo install critcmp

      # --- Run benchmarks on the BASE (target) branch ---
      - uses: actions/checkout@v6
        with:
          ref: ${{ github.event.pull_request.base.sha }}
          clean: false

      - uses: Swatinem/rust-cache@v2
        with:
          key: bench-base

      - name: Bench baseline
        run: cargo bench --all-features --bench samplers --bench optimization -- --save-baseline base

      # --- Run benchmarks on the HEAD (PR) branch ---
      - uses: actions/checkout@v6
        with:
          ref: ${{ github.event.pull_request.head.sha }}
          clean: false

      - uses: Swatinem/rust-cache@v2
        with:
          key: bench-head

      - name: Bench PR head
        run: cargo bench --all-features --bench samplers --bench optimization -- --save-baseline head

      # --- Compare and post comment ---
      - name: Compare benchmarks
        id: compare
        run: |
          EOF=$(dd if=/dev/urandom bs=15 count=1 status=none | base64)
          echo "result<<$EOF" >> "$GITHUB_OUTPUT"
          critcmp base head --color never >> "$GITHUB_OUTPUT"
          echo "$EOF" >> "$GITHUB_OUTPUT"

      - name: Find existing comment
        uses: peter-evans/find-comment@v4
        id: find-comment
        with:
          issue-number: ${{ github.event.pull_request.number }}
          comment-author: github-actions[bot]
          body-includes: "## Benchmark Comparison"

      - name: Post or update PR comment
        uses: peter-evans/create-or-update-comment@v5
        with:
          comment-id: ${{ steps.find-comment.outputs.comment-id }}
          issue-number: ${{ github.event.pull_request.number }}
          edit-mode: replace
          body: |
            ## Benchmark Comparison

            **Base:** `${{ github.event.pull_request.base.sha }}` | **Head:** `${{ github.event.pull_request.head.sha }}`

            <details>
            <summary>Click to expand full results</summary>

            ```
            ${{ steps.compare.outputs.result }}
            ```

            </details>

            > Benchmarks run on `ubuntu-latest` via [Criterion](https://github.com/bheisler/criterion.rs) + [critcmp](https://github.com/BurntSushi/critcmp).
            > Results may vary due to shared CI runners. Look for consistent >5% changes.

  publish:
    name: Publish to crates.io
    runs-on: ubuntu-latest
    if: github.event_name == 'push'
    needs:
      - fmt
      - clippy
      - test
      - examples
      - docs
      - feature-check
      - coverage
      - msrv
      - deny
      - machete
      - semver
      - minimal-versions
      - cross-platform
      - cross-targets
      - typos
      - bench-check
    steps:
      - uses: actions/checkout@v6
      - name: Install Rust
        run: |
          rustup override set stable
          rustup update stable
      - uses: Swatinem/rust-cache@v2

      - name: Check if version already published
        id: check
        run: |
          CARGO_VERSION=$(cargo metadata --no-deps --format-version 1 | jq -r '.packages[0].version')
          echo "version=$CARGO_VERSION" >> "$GITHUB_OUTPUT"

          HTTP_STATUS=$(curl -s -o /dev/null -w "%{http_code}" "https://crates.io/api/v1/crates/optimizer/$CARGO_VERSION")
          if [ "$HTTP_STATUS" = "200" ]; then
            echo "Version $CARGO_VERSION already exists on crates.io, skipping publish"
            echo "skip=true" >> "$GITHUB_OUTPUT"
          else
            echo "Version $CARGO_VERSION not found on crates.io, will publish"
            echo "skip=false" >> "$GITHUB_OUTPUT"
          fi

      - name: Publish
        if: steps.check.outputs.skip == 'false'
        run: |
          cargo publish --allow-dirty 2>&1 | tee publish_output.txt || {
            if grep -q "already uploaded" publish_output.txt; then
              echo "Version already published, skipping"
              exit 0
            fi
            exit 1
          }
        env:
          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}