write_mode 0.2.1

name: src checks

on:
  push:
    branches: ["**"]

permissions:
  contents: write

jobs:
  cargo-ci:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
      
      - name: Setup rust toolchain
        uses: dtolnay/rust-toolchain@1.85.1
      - name: Cache cargo registry
        uses: actions/cache@v4
        with:
          path: ~/.cargo/registry
          key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}

      - name: Cache cargo git index
        uses: actions/cache@v4
        with:
          path: ~/.cargo/git
          key: ${{ runner.os }}-cargo-git-${{ hashFiles('**/Cargo.lock') }}

      - name: Cache build artifacts
        uses: actions/cache@v4
        with:
          path: target
          key: ${{ runner.os }}-cargo-target-${{ hashFiles('**/Cargo.lock') }}
          restore-keys: |
            ${{ runner.os }}-cargo-target-

      - name: Run all tests
        run: |
          cargo test --all-targets
          cargo test --doc

      - name: Check if docs build cleanly
        run: cargo rustdoc -- -D warnings

      - name: Install rustfmt
        run: rustup component add rustfmt

      - name: Try to auto-format
        run: cargo fmt --all

      - name: Commit formatting fixes (but skip Cargo.toml)
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"

          if [[ -n "$(git status --porcelain)" ]]; then
            git commit -am "style: auto-format with cargo fmt"
            git push origin HEAD
          fi

      - name: Check formatting
        run: cargo fmt --check --all

  revert-if-failed:
    if: ${{ failure() }}
    runs-on: ubuntu-latest
    needs: [cargo-ci]
    steps:
      - name: Checkout the repo
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Save original commit info
        id: original_commit
        run: |
          echo "sha=$(git rev-parse HEAD)" >> "$GITHUB_OUTPUT"
          echo "msg=$(git log -1 --pretty=format:'%s')" >> "$GITHUB_OUTPUT"
          echo "author=$(git log -1 --pretty=format:'%an <%ae>')" >> "$GITHUB_OUTPUT"

      - name: Configure Git
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"

      - name: Revert last commit and push
        run: |
          git reset --hard HEAD~1
          git push origin HEAD --force

      - name: Notify the pusher
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          COMMIT_SHA="${{ steps.original_commit.outputs.sha }}"
          COMMIT_MSG="${{ steps.original_commit.outputs.msg }}"
          COMMIT_AUTHOR="${{ steps.original_commit.outputs.author }}"

          gh api repos/${{ github.repository }}/commits/${COMMIT_SHA}/comments \
            -f body="❌ CI checks failed.<br />**Commit**: $COMMIT_SHA<br />**Message**: \`$COMMIT_MSG\`<br />**Author**: $COMMIT_AUTHOR<br />This commit has been automatically reverted." \
            -H "Accept: application/vnd.github.v3+json"