name: Release

# PRD F8. On a v* tag push, build the single-file kigi binary for the five
# supported targets, package kigi-<version>-<target-triple>.{tar.gz|zip}
# (binary + LICENSE + NOTICE + THIRD-PARTY-NOTICES), and publish them as a
# GitHub Release alongside SHA256SUMS. install.sh, install.ps1 and
# auto_update::release_asset_name() all resolve these exact names — keep the
# naming in lockstep with them.
#
# RUNNERS. GitHub-hosted only; no job needs local state, and the repo is
# public, so nothing here may move to a self-hosted runner.
#
#   ubuntu-latest      x86_64-unknown-linux-gnu
#   ubuntu-24.04-arm   aarch64-unknown-linux-gnu, built natively (no cross C
#                      toolchain for ring, mimalloc, zstd-sys, libz-sys)
#   macos-latest       both Darwin targets; the runner is arm64, so x86_64 is
#                      a cross-compile against the same SDK
#   windows-latest     x86_64-pc-windows-msvc (VS Build Tools preinstalled,
#                      needed for the static MSVC CRT link)
#
# PUBLISH ORDER. The release is created as a draft and only made public once
# SHA256SUMS is attached, so `releases/latest` never hands the installer a
# release whose checksum manifest is still missing.

on:
  push:
    tags: ["v*"]

permissions:
  contents: write

env:
  CARGO_TERM_COLOR: always
  GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
  GH_REPO: ${{ github.repository }}
  # Matches the version pinned by the dotslash launcher in bin/protoc. That
  # launcher is not used here: it has no Windows entry and needs a `cargo
  # install dotslash` first, so every platform fetches protoc directly.
  PROTOC_VERSION: "29.3"

jobs:
  prepare:
    name: prepare draft release
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Check tag matches workspace version
        shell: bash
        run: |
          tag_version="${GITHUB_REF_NAME#v}"
          cargo_version="$(sed -n 's/^version = "\(.*\)"$/\1/p' Cargo.toml | head -n 1)"
          if [ "$tag_version" != "$cargo_version" ]; then
            echo "Tag $GITHUB_REF_NAME does not match workspace version $cargo_version" >&2
            exit 1
          fi

      # Idempotent so a re-run of a failed tag build reuses the same draft
      # instead of erroring on a duplicate tag_name.
      - name: Create or reuse draft release
        shell: bash
        run: |
          set -eu
          if gh release view "$GITHUB_REF_NAME" > /dev/null 2>&1; then
            echo "Reusing release $GITHUB_REF_NAME"
            exit 0
          fi
          prerelease=""
          case "$GITHUB_REF_NAME" in *-*) prerelease="--prerelease" ;; esac
          gh release create "$GITHUB_REF_NAME" --draft --verify-tag \
            --title "$GITHUB_REF_NAME" --generate-notes $prerelease
          echo "Created draft release $GITHUB_REF_NAME ${prerelease}"

  build:
    name: build (${{ matrix.target }})
    needs: prepare
    strategy:
      fail-fast: false
      matrix:
        include:
          - target: x86_64-unknown-linux-gnu
            runner: ubuntu-latest
            protoc: linux-x86_64
            ext: tar.gz
          - target: aarch64-unknown-linux-gnu
            runner: ubuntu-24.04-arm
            protoc: linux-aarch_64
            ext: tar.gz
          - target: aarch64-apple-darwin
            runner: macos-latest
            protoc: osx-aarch_64
            ext: tar.gz
          - target: x86_64-apple-darwin
            runner: macos-latest
            protoc: osx-aarch_64
            ext: tar.gz
          - target: x86_64-pc-windows-msvc
            runner: windows-latest
            protoc: win64
            ext: zip
    runs-on: ${{ matrix.runner }}
    steps:
      - uses: actions/checkout@v4

      # ── protoc ────────────────────────────────────────────────────────────
      - name: Install protoc (unix)
        if: matrix.ext == 'tar.gz'
        shell: bash
        run: |
          set -eu
          url="https://github.com/protocolbuffers/protobuf/releases/download/v${PROTOC_VERSION}/protoc-${PROTOC_VERSION}-${{ matrix.protoc }}.zip"
          curl -fsSL -o protoc.zip "$url"
          rm -rf "$HOME/protoc"
          unzip -q -o protoc.zip -d "$HOME/protoc"
          chmod +x "$HOME/protoc/bin/protoc"
          echo "$HOME/protoc/bin" >> "$GITHUB_PATH"

      - name: Install protoc (windows)
        if: matrix.ext == 'zip'
        shell: pwsh
        run: |
          $ErrorActionPreference = "Stop"
          $url = "https://github.com/protocolbuffers/protobuf/releases/download/v$env:PROTOC_VERSION/protoc-$env:PROTOC_VERSION-${{ matrix.protoc }}.zip"
          Invoke-WebRequest -Uri $url -OutFile protoc.zip
          $dest = Join-Path $env:USERPROFILE "protoc"
          if (Test-Path $dest) { Remove-Item $dest -Recurse -Force }
          Expand-Archive protoc.zip -DestinationPath $dest -Force
          Add-Content -Path $env:GITHUB_PATH -Value (Join-Path $dest "bin")

      # ── toolchain ─────────────────────────────────────────────────────────
      # rust-toolchain.toml pins the channel (1.97.0); `rustup show`
      # materialises exactly that.
      - name: Install toolchain
        shell: bash
        run: |
          set -eu
          # The arm64 Linux image is not guaranteed to ship rustup.
          # `--default-toolchain none` leaves the channel choice to
          # rust-toolchain.toml.
          if ! command -v rustup >/dev/null; then
            curl --proto '=https' --tlsv1.2 -fsSL https://sh.rustup.rs \
              | sh -s -- -y --no-modify-path --profile minimal --default-toolchain none
            echo "$HOME/.cargo/bin" >> "$GITHUB_PATH"
            export PATH="$HOME/.cargo/bin:$PATH"
          fi
          rustup show
          rustup target add ${{ matrix.target }}

      - uses: Swatinem/rust-cache@v2
        with:
          key: ${{ matrix.target }}

      # ── build ─────────────────────────────────────────────────────────────
      - name: Build kigi
        shell: bash
        run: cargo build --profile release-dist -p kigi-bin --locked --target ${{ matrix.target }}

      # ── package, upload, checksum ─────────────────────────────────────────
      # Archives go straight to the release rather than through the artifact
      # store: they are large, and the release is the only place install.sh
      # can read them from anyway. Only the checksum line travels as an
      # artifact, for the publish job to concatenate.
      - name: Package (unix)
        if: matrix.ext == 'tar.gz'
        shell: bash
        run: |
          set -eu
          version="${GITHUB_REF_NAME#v}"
          archive="kigi-${version}-${{ matrix.target }}.tar.gz"
          staging="$(mktemp -d)"
          cp "target/${{ matrix.target }}/release-dist/kigi" "$staging/kigi"
          cp LICENSE "$staging/"
          [ -f NOTICE ] && cp NOTICE "$staging/"
          for f in THIRD-PARTY-NOTICES THIRD-PARTY-NOTICES.md; do
            [ -f "$f" ] && cp "$f" "$staging/"
          done
          tar -C "$staging" -czf "$archive" .
          echo "ARCHIVE=$archive" >> "$GITHUB_ENV"

      - name: Package (windows)
        if: matrix.ext == 'zip'
        shell: pwsh
        run: |
          $ErrorActionPreference = "Stop"
          $version = $env:GITHUB_REF_NAME.TrimStart("v")
          $archive = "kigi-$version-${{ matrix.target }}.zip"
          $staging = Join-Path $env:RUNNER_TEMP "staging"
          if (Test-Path $staging) { Remove-Item $staging -Recurse -Force }
          New-Item -ItemType Directory -Force -Path $staging | Out-Null
          Copy-Item "target/${{ matrix.target }}/release-dist/kigi.exe" (Join-Path $staging "kigi.exe")
          Copy-Item LICENSE $staging
          if (Test-Path NOTICE) { Copy-Item NOTICE $staging }
          foreach ($f in @("THIRD-PARTY-NOTICES", "THIRD-PARTY-NOTICES.md")) {
            if (Test-Path $f) { Copy-Item $f $staging }
          }
          Compress-Archive -Path (Join-Path $staging "*") -DestinationPath $archive -Force
          Add-Content -Path $env:GITHUB_ENV -Value "ARCHIVE=$archive"

      # Git Bash on Windows; sha256sum is available on every runner except
      # macOS, which has shasum.
      - name: Upload and checksum
        shell: bash
        run: |
          set -eu
          gh release upload "$GITHUB_REF_NAME" "$ARCHIVE" --clobber
          echo "Uploaded $ARCHIVE"
          if command -v sha256sum >/dev/null; then
            sha256sum "$ARCHIVE" > "checksum-${{ matrix.target }}.txt"
          else
            shasum -a 256 "$ARCHIVE" > "checksum-${{ matrix.target }}.txt"
          fi
          cat "checksum-${{ matrix.target }}.txt"

      - uses: actions/upload-artifact@v4
        with:
          name: checksum-${{ matrix.target }}
          path: checksum-${{ matrix.target }}.txt
          if-no-files-found: error

  publish:
    name: publish release
    needs: [prepare, build]
    runs-on: ubuntu-latest
    steps:
      - uses: actions/download-artifact@v4
        with:
          path: checksums
          pattern: checksum-*
          merge-multiple: true

      - name: Assemble SHA256SUMS
        shell: bash
        run: |
          set -eu
          # Strip CR (Git Bash may emit CRLF) and the binary-mode `*` marker
          # so every line is `<hash>  <name>` for install.sh.
          cat checksums/checksum-*.txt \
            | tr -d '\r' | sed 's/ \*/  /' | grep -v '^$' | sort -k2 > SHA256SUMS
          lines="$(wc -l < SHA256SUMS)"
          if [ "$lines" -ne 5 ]; then
            echo "expected 5 checksum lines, got $lines" >&2
            cat SHA256SUMS >&2
            exit 1
          fi
          cat SHA256SUMS

      # Flip the draft public only now that every asset install.sh looks for
      # is attached.
      - name: Attach SHA256SUMS and publish
        shell: bash
        run: |
          set -eu
          gh release upload "$GITHUB_REF_NAME" SHA256SUMS --clobber
          gh release edit "$GITHUB_REF_NAME" --draft=false
          echo "Published $GITHUB_REF_NAME"