name: Build
on:
  pull_request:
  push:
    branches:
      - master
      - staging
      - trying
      - bors/staging
      - bors/trying

env:
  CARGO_TERM_COLOR: always
  DEV_VERSION: 2
  STABLE_VERSION: 1
  OLDSTABLE_VERSION: 0.5
  OLDOLDSTABLE_VERSION: 0.4

jobs:
  # Run cargo xtask format-check
  formatcheck:
    name: cargo fmt
    runs-on: ubuntu-22.04
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Fail on warnings
        run: find . -type f -name lib.rs -execdir sed -i 's,//deny_warnings_placeholder_for_ci,#![deny(warnings)],' {} +

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

      - name: cargo xtask format-check
        run:  cargo xtask format-check

  # Compilation check
  check:
    name: check
    runs-on: ubuntu-22.04
    strategy:
      matrix:
        backend:
          - thumbv7
          - thumbv6
          - thumbv8-base
          - thumbv8-main
        toolchain:
          - nightly
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Install Rust ${{ matrix.toolchain }}
        run: |
          rustup override set ${{ matrix.toolchain }}

      - name: Configure Rust target (v6, v7, v8.b v8.m)
        run: |
          rustup target add thumbv7m-none-eabi
          rustup target add thumbv6m-none-eabi
          rustup target add thumbv8m.base-none-eabi
          rustup target add thumbv8m.main-none-eabi

      - name: Fail on warnings
        run: find . -type f -name lib.rs -execdir sed -i 's,//deny_warnings_placeholder_for_ci,#![deny(warnings)],' {} +

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

      - run: cargo xtask --backend ${{ matrix.backend }} check 

  # Clippy
  clippy:
    name: clippy
    runs-on: ubuntu-22.04
    strategy:
      matrix:
        backend:
          - thumbv7
          - thumbv6
          - thumbv8-base
          - thumbv8-main
        toolchain:
          - nightly
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Install Rust ${{ matrix.toolchain }}
        run: |
          rustup override set ${{ matrix.toolchain }}

      - name: Configure Rust target (v6, v7, v8.b v8.m)
        run: |
          rustup target add thumbv7m-none-eabi
          rustup target add thumbv6m-none-eabi
          rustup target add thumbv8m.base-none-eabi
          rustup target add thumbv8m.main-none-eabi

      - name: Add Rust component clippy
        run: rustup component add clippy

      - name: Fail on warnings
        run: find . -type f -name lib.rs -execdir sed -i 's,//deny_warnings_placeholder_for_ci,#![deny(warnings)],' {} +

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

      - run: cargo xtask --backend ${{ matrix.backend }} clippy

  # Verify all examples, checks
  checkexamples:
    name: check examples
    runs-on: ubuntu-22.04
    strategy:
      matrix:
        backend:
          - thumbv7
          - thumbv6
          - thumbv8-base
          - thumbv8-main
        toolchain:
          - nightly
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Install Rust ${{ matrix.toolchain }}
        run: |
          rustup override set ${{ matrix.toolchain }}

      - name: Configure Rust target (v6, v7, v8.b v8.m)
        run: |
          rustup target add thumbv7m-none-eabi
          rustup target add thumbv6m-none-eabi
          rustup target add thumbv8m.base-none-eabi
          rustup target add thumbv8m.main-none-eabi

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

      - name: Check the examples
        if: ${{ matrix.backend == 'thumbv8-base' }}
        run: cargo xtask --backend ${{ matrix.backend }} --exampleexclude pool example-check

      - name: Check the examples
        if: ${{ matrix.backend != 'thumbv8-base' }}
        run: cargo xtask --backend ${{ matrix.backend }} example-check

  # Verify the example output with run-pass tests
  testexamples:
    name: QEMU run
    runs-on: ubuntu-22.04
    strategy:
      matrix:
        backend:
          - thumbv7
          - thumbv6
        toolchain:
          - nightly
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Install Rust ${{ matrix.toolchain }}
        run: |
          rustup set profile minimal
          rustup override set ${{ matrix.toolchain }}

      - name: Configure Rust target (v6, v7)
        run: |
          rustup target add thumbv7m-none-eabi
          rustup target add thumbv6m-none-eabi

      - name: Add Rust component llvm-tools-preview
        run: rustup component add llvm-tools-preview

      # Use precompiled binutils
      - name: Install cargo-binutils
        uses: taiki-e/install-action@v2
        with:
          tool: cargo-binutils

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

      - name: Install QEMU
        run: |
          sudo apt update
          sudo apt install -y qemu-system-arm

      - name: Fail on warnings
        working-directory: ./rtic
        run: sed -i 's,//deny_warnings_placeholder_for_ci,#![deny(warnings)],' src/lib.rs

      - name: Run-pass tests
        run: cargo xtask --backend ${{ matrix.backend }} qemu 

  # Run test suite
  tests:
    name: tests
    runs-on: ubuntu-22.04
    strategy:
      fail-fast: false
      matrix:
        backend:
          - thumbv7
          - thumbv6
          - thumbv8-base
          - thumbv8-main
        package:
          - rtic
          - rtic-common
          - rtic-macros
          - rtic-monotonics
          - rtic-sync
          - rtic-time

    steps:
      - name: Checkout
        uses: actions/checkout@v3

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

      - name: Configure Rust target (v6, v7, v8.b v8.m)
        run: |
          rustup target add thumbv7m-none-eabi
          rustup target add thumbv6m-none-eabi
          rustup target add thumbv8m.base-none-eabi
          rustup target add thumbv8m.main-none-eabi

      - name: Fail on warnings
        run: find . -type f -name lib.rs -execdir sed -i 's,//deny_warnings_placeholder_for_ci,#![deny(warnings)],' {} +

      - name: Run cargo test
        run: cargo xtask --backend ${{ matrix.backend }} test ${{ matrix.package }}

  # Build documentation, check links
  docs:
    name: build docs
    runs-on: ubuntu-22.04
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Install lychee
        uses: taiki-e/install-action@v2
        with:
          tool: lychee

      - name: Remove cargo-config
        run: rm -f .cargo/config

      - name: Build docs
        # TODO: Any difference between backends?
        run: cargo doc --features thumbv7-backend

      - name: Check links
        run: |
          td=$(mktemp -d)
          cp -r target/doc $td/api
          echo rtic
          lychee --offline --format detailed $td/api/rtic/
        
          echo rtic_common
          lychee --offline --format detailed $td/api/rtic_common/
        
          echo rtic_macros
          lychee --offline --format detailed $td/api/rtic_macros/
        
          echo rtic_monotonics
          lychee --offline --format detailed $td/api/rtic_monotonics/

          echo rtic_sync
          lychee --offline --format detailed $td/api/rtic_sync/
        
          echo rtic_time
          lychee --offline --format detailed $td/api/rtic_time/
      

      - name: Archive the API docs
        run: |
          cp -r target/doc apidocs
          tar -cf apidocs.tar apidocs

      - name: Store the API docs
        uses: actions/upload-artifact@v3
        with:
          name: apidocs
          path: apidocs.tar

  # Build the books
  mdbook:
    name: build mdbook
    needs: docs
    runs-on: ubuntu-22.04
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Install lychee
        uses: taiki-e/install-action@v2
        with:
          tool: lychee

      - name: Install mdbook
        uses: taiki-e/install-action@v2
        with:
          tool: mdbook

      - name: Install mdbook-mermaid
        uses: taiki-e/install-action@v2
        with:
          tool: mdbook-mermaid

      - name: Build book in English
        run: cargo xtask book

      - name: Download built API docs
        uses: actions/download-artifact@v3
        with:
          name: apidocs

      - name: Extract the API docs
        run: tar -xf apidocs.tar 

      - name: Check links
        run: |
          td=$(mktemp -d)
          mkdir $td/book
          cp -r book/en/book $td/book/en
          cp LICENSE-* $td/book/en
          cp -r apidocs/ $td/api

          lychee --offline --format detailed $td/book/en/
          mv $td bookroot

      - name: Archive the book + API docs
        run: |
          tar -cf book.tar bookroot

      - name: Store the Book + API docs
        uses: actions/upload-artifact@v3
        with:
          name: book
          path: book.tar

  mdbookold:
    name: build docs and mdbook for older releases
    needs: mergetostablebranch
    runs-on: ubuntu-22.04
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Install mdbook
        uses: taiki-e/install-action@v2
        with:
          tool: mdbook

      - name: Install mdbook-mermaid
        uses: taiki-e/install-action@v2
        with:
          tool: mdbook-mermaid

      - name: Remove cargo-config
        run: rm -f .cargo/config

      - name: Prepare output folder
        run: mkdir -p mdbookold

      - name: Fetch and build books for older versions
        run: |
          # The latest stable must be the first element in the array
          vers=( "${{ env.STABLE_VERSION }}" "${{ env.OLDSTABLE_VERSION }}" )
          langs=( en )
          root=$(pwd)
          webroot=$(pwd)/mdbookold

          for ver in ${vers[@]}; do

              mkdir -p src/$ver
              src=$root/src/$ver
              curl -L https://github.com/rtic-rs/rtic/archive/release/v${ver}.tar.gz | tar xz --strip-components 1 -C $src

              pushd $src
              rm -f .cargo/config
              cargo doc || cargo doc --features timer-queue
              mkdir -p $webroot/$ver/book
              cp -r target/doc $webroot/$ver/api

              sed 's|URL|rtic/index.html|g' $root/redirect.html > $webroot/$ver/api/index.html
              popd

              for lang in ${langs[@]}; do
                  cargo xtask book build $src/book/$lang

                  cp -r $src/book/$lang/book $webroot/$ver/book/$lang
                  cp LICENSE-* $webroot/$ver/book/$lang/
              done
              # using master branch redirect file
              sed 's|URL|book/en|g' $root/redirect.html > $webroot/$ver/index.html

              rm -rf $src
          done

      - name: Archive the old books
        run: |
          tar -cf mdbookold.tar mdbookold

      - name: Store the old API docs
        uses: actions/upload-artifact@v3
        with:
          name: mdbookold
          path: mdbookold.tar

  parseversion:
    name: Parse the master branch RTIC version
    runs-on: ubuntu-22.04
    steps:
      - uses: actions/checkout@v3

      - name: Get crate version and print output branch release/vX
        id: crateversionbranch
        # Parse metadata for version number, extract the Semver Major
        run: |
          VERSION=$(cargo metadata --format-version 1 --no-deps --offline | jq -r '.packages[] | select(.name =="rtic") | .version')
          VERSIONMAJOR=${VERSION%.*.*}
          echo "branch=release/v$VERSIONMAJOR" >> $GITHUB_ENV
          echo "versionmajor=$VERSIONMAJOR" >> $GITHUB_ENV
          echo "version=$VERSION" >> $GITHUB_ENV


  # Update stable branch
  #
  # This is only valid when current stable resides in
  # master branch.
  # As master moves on to development, the work on the
  # stable version will happen in release/v"stable_version".
  # Thus, no need to push changes 
  #
  # This needs to run before book is built, as bookbuilding fetches from the branch
  mergetostablebranch:
    name: Merge branch into release/vX when pushing to master
    runs-on: ubuntu-22.04
    needs:
      - ci-success
      - parseversion

    # Only run this when pushing to master branch
    if: github.ref == 'refs/heads/master'
    steps:
      - uses: actions/checkout@v3

      - name: Push to stable release branch if master contains stable version
        if: ${{ env.versionmajor == env.STABLE_VERSION }}
        run: git push -u origin ${{ env.branch }}

  # Only runs when pushing to master branch
  # Bors run CI against staging branch,
  # if that succeeds Borst tries against master branch
  # If all tests pass, then deploy stage is run
  deploy:
    name: deploy
    runs-on: ubuntu-22.04
    needs:
      - mergetostablebranch
      - docs      
      - mdbookold      
      - mdbook

    # Only run this when pushing to master branch
    if: github.ref == 'refs/heads/master'
    steps:
      - uses: actions/checkout@v3

      - name: Install lychee
        uses: taiki-e/install-action@v2
        with:
         tool: lychee

      - name: Install mdbook-mermaid
        uses: taiki-e/install-action@v2
        with:
          tool: mdbook-mermaid
 
      - name: mdBook Action
        uses: peaceiris/actions-mdbook@v1
        with:
          mdbook-version: 'latest'

      - name: Remove cargo-config
        run: rm -f .cargo/config

      - name: Download built dev-ver book and API docs
        uses: actions/download-artifact@v3
        with:
          name: book

      - name: Extract the dev-version book and API docs
        run: |
          tar -xf book.tar 

      - name: Download built old versions of books and API docs
        uses: actions/download-artifact@v3
        with:
          name: mdbookold

      - name: Extract the old version books and API docs
        run: |
          tar -xf mdbookold.tar 

      - name: Prepare books
        shell: 'script --return --quiet --command "bash {0}"'
        run: |
          langs=( en )
          devver=( dev )
          # The latest stable must be the first element in the array
          vers=( "${{ env.STABLE_VERSION }}" "${{ env.OLDSTABLE_VERSION }}" )

          # All releases start with "v"
          # followed by MAJOR.MINOR.PATCH, see semver.org
          # Store first in array as stable
          stable=${vers}
          crateversion=${{ env.versionmajor }}

          echo "Latest stable version: $stable"
          echo "Current crate version: $crateversion"

          # Create directories
          td=$(mktemp -d)
          mkdir -p $td/$devver/
          cp -r bookroot/* $td/$devver/

          # Redirect rtic.rs/meeting/index.html to hackmd
          mkdir $td/meeting
          sed "s|URL|https://hackmd.io/c_mFUZL-Q2C6614MlrrxOg|g" redirect.html > $td/meeting/index.html
          sed -i "s|Page Redirection|RTIC Meeting|" $td/meeting/index.html
          sed -i "s|If you|Redirecting to RTIC HackMD. If you|" $td/meeting/index.html

          # Redirect the main site to the stable release
          sed "s|URL|$stable|g" redirect.html > $td/index.html

          # Create the redirects for dev-version
          # If the current stable and the version being built differ,
          # then there is a dev-version and the links should point to it.
          if [[ "$stable" != "$crateversion" ]];
          then
            sed 's|URL|rtic/index.html|g' redirect.html > $td/$devver/api/index.html
            sed 's|URL|book/en|g' redirect.html > $td/$devver/index.html
          else
            # If the current stable and the "dev" version in master branch
            # share the same major version, redirect dev/ to stable book
            # This makes sense, preferable to have doc/book updates going live directly to rtic.rs
            sed 's|URL|rtic.rs/$stable/api/rtic|g' redirect.html > $td/$devver/api/index.html
            sed 's|URL|rtic.rs/$stable|g' redirect.html > $td/$devver/index.html
          fi

          # Package older versions, including stable

          # Copy the stable book to the stable alias
          cp -r mdbookold/${{ env.STABLE_VERSION }} $td/stable

          # Copy the stable book to the webroot
          cp -r mdbookold/${{ env.STABLE_VERSION }} $td/
          # Copy the old stable book to the webroot
          cp -r mdbookold/${{ env.OLDSTABLE_VERSION }} $td/

          # Forward CNAME file
          cp CNAME $td/
          mv $td/ bookstodeploy

      - name: Archive the webroot
        run: |
          tar -cf bookstodeploy.tar bookstodeploy

      - name: Store the books
        uses: actions/upload-artifact@v3
        with:
          name: bookstodeploy
          path: bookstodeploy.tar

  ghapages:
    name: Publish rtic.rs
    runs-on: ubuntu-22.04
    needs:
      - deploy
    steps:
      - name: Download books
        uses: actions/download-artifact@v3
        with:
          name: bookstodeploy

      - name: Extract the books
        run: |
          tar -xf bookstodeploy.tar 

      - name: Deploy to GH-pages
        uses: peaceiris/actions-gh-pages@v3
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          publish_dir: ./bookstodeploy
          force_orphan: true

  # Refs: https://github.com/rust-lang/crater/blob/9ab6f9697c901c4a44025cf0a39b73ad5b37d198/.github/workflows/bors.yml#L125-L149
  #
  # ALL THE PREVIOUS JOBS NEEDS TO BE ADDED TO THE `needs` SECTION OF THIS JOB!

  ci-success:
    name: ci
    if: github.event_name == 'push' && success()
    needs:
      - formatcheck
      - check
      - clippy
      - checkexamples
      - testexamples
      - tests
      - docs
      - mdbook
    runs-on: ubuntu-22.04
    steps:
      - name: Mark the job as a success
        run: exit 0