name: Release

on:
  push:
    tags:
      - '[0-9]+.[0-9]+.[0-9]+'
  workflow_dispatch:
    inputs:
      tag:
        description: 'Release tag (example: 3.3.15)'
        required: true
        type: string

concurrency:
  group: release-${{ github.ref_name }}-${{ github.event.inputs.tag || 'auto' }}
  cancel-in-progress: true

permissions:
  contents: read

env:
  CARGO_TERM_COLOR: always
  BINARY_NAME: telemt

jobs:
  prepare:
    name: Prepare
    runs-on: ubuntu-latest

    outputs:
      version: ${{ steps.vars.outputs.version }}
      prerelease: ${{ steps.vars.outputs.prerelease }}

    steps:
      - name: Resolve version
        id: vars
        shell: bash
        run: |
          set -euo pipefail

          if [ "${GITHUB_EVENT_NAME}" = "workflow_dispatch" ]; then
            VERSION="${{ github.event.inputs.tag }}"
          else
            VERSION="${GITHUB_REF#refs/tags/}"
          fi

          VERSION="${VERSION#refs/tags/}"

          if [ -z "${VERSION}" ]; then
            echo "Release version is empty" >&2
            exit 1
          fi

          if [[ "${VERSION}" == *-* ]]; then
            PRERELEASE=true
          else
            PRERELEASE=false
          fi

          echo "version=${VERSION}" >> "${GITHUB_OUTPUT}"
          echo "prerelease=${PRERELEASE}" >> "${GITHUB_OUTPUT}"

  # ==========================
  # GNU / glibc
  # ==========================
  build-gnu:
    name: GNU ${{ matrix.asset }}
    runs-on: ubuntu-latest
    needs: prepare

    container:
      image: rust:slim-bookworm

    strategy:
      fail-fast: false
      matrix:
        include:
          - target: x86_64-unknown-linux-gnu
            asset: telemt-x86_64-linux-gnu
            cpu: baseline

          - target: x86_64-unknown-linux-gnu
            asset: telemt-x86_64-v3-linux-gnu
            cpu: v3

          - target: aarch64-unknown-linux-gnu
            asset: telemt-aarch64-linux-gnu
            cpu: generic

    steps:
      - uses: actions/checkout@v4

      - uses: dtolnay/rust-toolchain@v1
        with:
          toolchain: stable
          targets: |
            x86_64-unknown-linux-gnu
            aarch64-unknown-linux-gnu

      - name: Install deps
        run: |
          apt-get update
          apt-get install -y \
            build-essential \
            clang \
            lld \
            pkg-config \
            gcc-aarch64-linux-gnu \
            g++-aarch64-linux-gnu

      - uses: actions/cache@v4
        with:
          path: |
            /usr/local/cargo/registry
            /usr/local/cargo/git
            target
          key: gnu-${{ matrix.asset }}-${{ hashFiles('**/Cargo.lock') }}
          restore-keys: |
            gnu-${{ matrix.asset }}-
            gnu-

      - name: Build
        shell: bash
        run: |
          set -euo pipefail

          if [ "${{ matrix.target }}" = "aarch64-unknown-linux-gnu" ]; then
            export CC=aarch64-linux-gnu-gcc
            export CXX=aarch64-linux-gnu-g++
            export RUSTFLAGS="-C linker=aarch64-linux-gnu-gcc -C lto=fat -C panic=abort"
          else
            export CC=clang
            export CXX=clang++

            if [ "${{ matrix.cpu }}" = "v3" ]; then
              CPU_FLAGS="-C target-cpu=x86-64-v3"
            else
              CPU_FLAGS="-C target-cpu=x86-64"
            fi

            export RUSTFLAGS="-C linker=clang -C link-arg=-fuse-ld=lld -C lto=fat -C panic=abort ${CPU_FLAGS}"
          fi

          cargo build --release --target ${{ matrix.target }} -j "$(nproc)"

      - name: Package
        shell: bash
        run: |
          set -euo pipefail

          mkdir -p dist
          cp "target/${{ matrix.target }}/release/${{ env.BINARY_NAME }}" dist/telemt

          if [ "${{ matrix.target }}" = "aarch64-unknown-linux-gnu" ]; then
            STRIP_BIN=aarch64-linux-gnu-strip
          else
            STRIP_BIN=strip
          fi

          "${STRIP_BIN}" dist/telemt

          cd dist
          tar -czf "${{ matrix.asset }}.tar.gz" \
            --owner=0 --group=0 --numeric-owner \
            telemt

          sha256sum "${{ matrix.asset }}.tar.gz" > "${{ matrix.asset }}.tar.gz.sha256"

      - uses: actions/upload-artifact@v4
        with:
          name: ${{ matrix.asset }}
          path: dist/*

  # ==========================
  # MUSL
  # ==========================
  build-musl:
    name: MUSL ${{ matrix.asset }}
    runs-on: ubuntu-latest
    needs: prepare

    container:
      image: rust:slim-bookworm

    strategy:
      fail-fast: false
      matrix:
        include:
          - target: x86_64-unknown-linux-musl
            asset: telemt-x86_64-linux-musl
            cpu: baseline

          - target: x86_64-unknown-linux-musl
            asset: telemt-x86_64-v3-linux-musl
            cpu: v3

          - target: aarch64-unknown-linux-musl
            asset: telemt-aarch64-linux-musl
            cpu: generic

    steps:
      - uses: actions/checkout@v4

      - name: Install deps
        run: |
          apt-get update
          apt-get install -y \
            musl-tools \
            pkg-config \
            curl

      - uses: actions/cache@v4
        if: matrix.target == 'aarch64-unknown-linux-musl'
        with:
          path: ~/.musl-aarch64
          key: musl-toolchain-aarch64-v1

      - name: Install aarch64 musl toolchain
        if: matrix.target == 'aarch64-unknown-linux-musl'
        shell: bash
        run: |
          set -euo pipefail

          TOOLCHAIN_DIR="$HOME/.musl-aarch64"
          ARCHIVE="aarch64-linux-musl-cross.tgz"
          URL="https://github.com/telemt/telemt/releases/download/toolchains/${ARCHIVE}"

          if [ -x "${TOOLCHAIN_DIR}/bin/aarch64-linux-musl-gcc" ]; then
            echo "MUSL toolchain cached"
          else
            curl -fL \
              --retry 5 \
              --retry-delay 3 \
              --connect-timeout 10 \
              --max-time 120 \
              -o "${ARCHIVE}" "${URL}"

            mkdir -p "${TOOLCHAIN_DIR}"
            tar -xzf "${ARCHIVE}" --strip-components=1 -C "${TOOLCHAIN_DIR}"
          fi

          echo "${TOOLCHAIN_DIR}/bin" >> "${GITHUB_PATH}"

      - name: Add rust target
        run: rustup target add ${{ matrix.target }}

      - uses: actions/cache@v4
        with:
          path: |
            /usr/local/cargo/registry
            /usr/local/cargo/git
            target
          key: musl-${{ matrix.asset }}-${{ hashFiles('**/Cargo.lock') }}
          restore-keys: |
            musl-${{ matrix.asset }}-
            musl-

      - name: Build
        shell: bash
        run: |
          set -euo pipefail

          if [ "${{ matrix.target }}" = "aarch64-unknown-linux-musl" ]; then
            export CC=aarch64-linux-musl-gcc
            export CC_aarch64_unknown_linux_musl=aarch64-linux-musl-gcc
            export RUSTFLAGS="-C target-feature=+crt-static -C linker=aarch64-linux-musl-gcc -C lto=fat -C panic=abort"
          else
            export CC=musl-gcc
            export CC_x86_64_unknown_linux_musl=musl-gcc

            if [ "${{ matrix.cpu }}" = "v3" ]; then
              CPU_FLAGS="-C target-cpu=x86-64-v3"
            else
              CPU_FLAGS="-C target-cpu=x86-64"
            fi

            export RUSTFLAGS="-C target-feature=+crt-static -C lto=fat -C panic=abort ${CPU_FLAGS}"
          fi

          cargo build --release --target ${{ matrix.target }} -j "$(nproc)"

      - name: Package
        shell: bash
        run: |
          set -euo pipefail

          mkdir -p dist
          cp "target/${{ matrix.target }}/release/${{ env.BINARY_NAME }}" dist/telemt

          if [ "${{ matrix.target }}" = "aarch64-unknown-linux-musl" ]; then
            STRIP_BIN=aarch64-linux-musl-strip
          else
            STRIP_BIN=strip
          fi

          "${STRIP_BIN}" dist/telemt

          cd dist
          tar -czf "${{ matrix.asset }}.tar.gz" \
            --owner=0 --group=0 --numeric-owner \
            telemt

          sha256sum "${{ matrix.asset }}.tar.gz" > "${{ matrix.asset }}.tar.gz.sha256"

      - uses: actions/upload-artifact@v4
        with:
          name: ${{ matrix.asset }}
          path: dist/*

  # ==========================
  # Release
  # ==========================
  release:
    name: Release
    runs-on: ubuntu-latest
    needs: [prepare, build-gnu, build-musl]

    permissions:
      contents: write

    steps:
      - uses: actions/download-artifact@v4
        with:
          path: artifacts

      - name: Flatten artifacts
        shell: bash
        run: |
          set -euo pipefail
          mkdir -p dist
          find artifacts -type f -exec cp {} dist/ \;

      - name: Create GitHub Release
        uses: softprops/action-gh-release@v2
        with:
          tag_name: ${{ needs.prepare.outputs.version }}
          target_commitish: ${{ github.sha }}
          files: dist/*
          generate_release_notes: true
          prerelease: ${{ needs.prepare.outputs.prerelease == 'true' }}
          overwrite_files: true

  # ==========================
  # Docker
  # ==========================
  docker:
    name: Docker
    runs-on: ubuntu-latest
    needs: [prepare, release]

    permissions:
      contents: read
      packages: write

    steps:
      - uses: actions/checkout@v4

      - uses: docker/setup-qemu-action@v3

      - uses: docker/setup-buildx-action@v3

      - uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Probe release assets
        shell: bash
        env:
          VERSION: ${{ needs.prepare.outputs.version }}
        run: |
          set -euo pipefail

          for asset in \
            telemt-x86_64-linux-musl.tar.gz \
            telemt-x86_64-linux-musl.tar.gz.sha256 \
            telemt-aarch64-linux-musl.tar.gz \
            telemt-aarch64-linux-musl.tar.gz.sha256
          do
            curl -fsIL \
              --retry 10 \
              --retry-delay 3 \
              "https://github.com/${GITHUB_REPOSITORY}/releases/download/${VERSION}/${asset}" \
              > /dev/null
          done

      - name: Compute image tags
        id: meta
        shell: bash
        env:
          VERSION: ${{ needs.prepare.outputs.version }}
        run: |
          set -euo pipefail

          IMAGE="$(echo "ghcr.io/${GITHUB_REPOSITORY}" | tr '[:upper:]' '[:lower:]')"
          TAGS="${IMAGE}:${VERSION}"

          if [[ "${VERSION}" != *-* ]]; then
            TAGS="${TAGS}"$'\n'"${IMAGE}:latest"
          fi

          {
            echo "tags<<EOF"
            printf '%s\n' "${TAGS}"
            echo "EOF"
          } >> "${GITHUB_OUTPUT}"

      - name: Build & Push
        uses: docker/build-push-action@v6
        with:
          context: .
          push: true
          pull: true
          platforms: linux/amd64,linux/arm64
          tags: ${{ steps.meta.outputs.tags }}
          build-args: |
            TELEMT_REPOSITORY=${{ github.repository }}
            TELEMT_VERSION=${{ needs.prepare.outputs.version }}
          cache-from: type=gha
          cache-to: type=gha,mode=max