# Automated build + release for the uo-link Rust sidecar.
#
# Trigger: every push to `main` (i.e. every merged PR).
#
# Flow (two conceptual halves, kept separate on purpose):
#
#   ┌── RELEASE ENGINE (language-agnostic) ─────────────────────────────┐
#   │  reads: latest v* git tag + conventional-commit subjects          │
#   │  produces: next version, changelog, and (at the end) the release  │
#   └───────────────────────────────────────────────────────────────────┘
#   ┌── RUST ADAPTER (the only Rust-specific part) ─────────────────────┐
#   │  consumes: the version                                            │
#   │  produces: the artifacts (linux bin, windows exe, SHA256SUMS)     │
#   └───────────────────────────────────────────────────────────────────┘
#
# To retarget this engine at a C#/Node/Docker/static project later, only the
# "Rust adapter" steps change — the plan + release steps consume just
# {version, changelog, artifacts} and know nothing about Rust.
#
# Version bump (conventional commits since the last v* tag):
#   feat!: / BREAKING CHANGE  -> major     feat: -> minor     fix|perf: -> patch
#   nothing releasable        -> no release is cut
#   (first ever run, no tag)  -> releases the current Cargo.toml version as-is
#
# Prerequisites (Settings → Actions → Secrets on UOM/link):
#   REGISTRY_USER   — Gitea username the token below belongs to
#   REGISTRY_TOKEN  — Gitea access token. For image builds it needed
#                     write:package; THIS workflow additionally needs
#                     `write:repository` so it can push the bump commit + tag
#                     and create the release. Grant that scope to the token.
#   Also: `main` must accept a direct push from that user (disable branch
#   protection for it, or add it as an exception) — the bump commit lands on main.
#
# The bump commit carries `[skip ci]`, so it does not re-trigger this workflow.

name: Release sidecar

on:
  push:
    branches: [main]
  workflow_dispatch: {}

concurrency:
  group: release-sidecar
  cancel-in-progress: false

env:
  GITEA_HOST: gitea.whitlocktech.com
  REPO: UOM/link
  WORKDIR: sidecar
  BIN: uo-link-sidecar
  LINUX_TARGET: x86_64-unknown-linux-gnu
  WINDOWS_TARGET: x86_64-pc-windows-gnu

jobs:
  release:
    runs-on: ubuntu-latest
    # Don't loop on our own bump commit (belt-and-suspenders with [skip ci]).
    # Quoted because the expression contains a colon (`chore(release):`), which an
    # unquoted YAML scalar would misparse as a mapping value.
    if: "${{ !contains(github.event.head_commit.message, 'chore(release): bump version') }}"
    steps:
      - name: Check out full history (need tags + commit log for the bump)
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      # ── RELEASE ENGINE: decide the next version + changelog ──────────────
      - name: Plan the release (version + changelog)
        id: plan
        run: |
          set -euo pipefail
          mkdir -p dist
          git fetch --tags --force >/dev/null 2>&1 || true

          CARGO_VERSION="$(grep -m1 '^version' "${WORKDIR}/Cargo.toml" | sed -E 's/.*"([^"]+)".*/\1/')"
          LAST_TAG="$(git describe --tags --match 'v*' --abbrev=0 2>/dev/null || true)"
          if [ -n "$LAST_TAG" ]; then RANGE="${LAST_TAG}..HEAD"; else RANGE="HEAD"; fi

          SUBJECTS="$(git log --no-merges --format='%s' $RANGE || true)"
          BODIES="$(git log --no-merges --format='%B' $RANGE || true)"

          BUMP=none
          if echo "$BODIES"   | grep -qE 'BREAKING[ -]CHANGE'          ; then BUMP=major; fi
          if echo "$SUBJECTS" | grep -qE '^[a-z]+(\([^)]+\))?!:'       ; then BUMP=major; fi
          if [ "$BUMP" = none ] && echo "$SUBJECTS" | grep -qE '^feat(\([^)]+\))?:'      ; then BUMP=minor; fi
          if [ "$BUMP" = none ] && echo "$SUBJECTS" | grep -qE '^(fix|perf)(\([^)]+\))?:'; then BUMP=patch; fi

          bump() { # <x.y.z> <major|minor|patch> -> bumped
            IFS=. read -r MA MI PA <<< "$1"
            case "$2" in
              major) echo "$((MA+1)).0.0" ;;
              minor) echo "${MA}.$((MI+1)).0" ;;
              patch) echo "${MA}.${MI}.$((PA+1))" ;;
            esac
          }

          RELEASE=true
          if [ -z "$LAST_TAG" ]; then
            VERSION="$CARGO_VERSION"                 # first release: ship what's in Cargo.toml
          elif [ "$BUMP" = none ]; then
            RELEASE=false                            # no feat/fix/breaking since last tag
            VERSION="${LAST_TAG#v}"
          else
            VERSION="$(bump "${LAST_TAG#v}" "$BUMP")"
          fi

          if git rev-parse -q --verify "refs/tags/v${VERSION}" >/dev/null; then
            echo "Tag v${VERSION} already exists — nothing to release."
            RELEASE=false
          fi

          {
            echo "## ${BIN} v${VERSION}"
            echo
            FEATS="$(echo "$SUBJECTS" | grep -E '^feat'        || true)"
            FIXES="$(echo "$SUBJECTS" | grep -E '^(fix|perf)'  || true)"
            [ -n "$FEATS" ] && { echo "### Features";  echo "$FEATS" | sed 's/^/- /'; echo; }
            [ -n "$FIXES" ] && { echo "### Fixes";     echo "$FIXES" | sed 's/^/- /'; echo; }
            echo "### All changes"
            if [ -n "$LAST_TAG" ]; then echo "Since ${LAST_TAG}:"; fi
            echo "$SUBJECTS" | sed 's/^/- /'
          } > dist/CHANGELOG.md

          echo "version=${VERSION}"   >> "$GITHUB_OUTPUT"
          echo "tag=v${VERSION}"      >> "$GITHUB_OUTPUT"
          echo "release=${RELEASE}"   >> "$GITHUB_OUTPUT"
          echo "bump=${BUMP}"         >> "$GITHUB_OUTPUT"
          echo "==> release=${RELEASE} version=${VERSION} bump=${BUMP} last_tag=${LAST_TAG:-<none>}"

      # ── RUST ADAPTER: toolchain + cross-compile deps ─────────────────────
      - name: Install Rust toolchain, Windows target, and MinGW linker
        if: ${{ steps.plan.outputs.release == 'true' }}
        run: |
          set -euo pipefail
          SUDO=""; [ "$(id -u)" -ne 0 ] && SUDO="sudo"
          $SUDO apt-get update
          $SUDO apt-get install -y --no-install-recommends \
            build-essential gcc-mingw-w64-x86-64 curl ca-certificates git jq

          if ! command -v cargo >/dev/null 2>&1; then
            curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs \
              | sh -s -- -y --profile minimal --default-toolchain stable
          fi
          echo "${HOME}/.cargo/bin" >> "$GITHUB_PATH"
          export PATH="${HOME}/.cargo/bin:${PATH}"
          rustup component add rustfmt
          rustup target add "${WINDOWS_TARGET}"

      - name: Set the crate version to match the release
        if: ${{ steps.plan.outputs.release == 'true' }}
        run: |
          set -euo pipefail
          VERSION="${{ steps.plan.outputs.version }}"
          # Replace only the [package] version (the first `version = "..."`).
          sed -i -E "0,/^version = \"[^\"]+\"/s//version = \"${VERSION}\"/" "${WORKDIR}/Cargo.toml"
          grep -m1 '^version' "${WORKDIR}/Cargo.toml"
          # Bumping the manifest version desyncs this crate's own entry in
          # Cargo.lock, which would make the `--locked` fmt/test/build steps below
          # fail ("cannot update the lock file ... --locked was passed"). Sync just
          # the workspace member(s) into the lock — dependency pins are untouched.
          cargo update --manifest-path "${WORKDIR}/Cargo.toml" --workspace

      # ── RUST ADAPTER: gates ──────────────────────────────────────────────
      - name: cargo fmt --check
        if: ${{ steps.plan.outputs.release == 'true' }}
        working-directory: sidecar
        run: cargo fmt --check

      - name: cargo test
        if: ${{ steps.plan.outputs.release == 'true' }}
        working-directory: sidecar
        run: cargo test --locked

      # ── RUST ADAPTER: build both targets ─────────────────────────────────
      - name: cargo build --release (Linux)
        if: ${{ steps.plan.outputs.release == 'true' }}
        working-directory: sidecar
        run: cargo build --release --locked --target "${LINUX_TARGET}"

      - name: cargo build --release (Windows, cross via MinGW)
        if: ${{ steps.plan.outputs.release == 'true' }}
        working-directory: sidecar
        env:
          CARGO_TARGET_X86_64_PC_WINDOWS_GNU_LINKER: x86_64-w64-mingw32-gcc
          CC_x86_64_pc_windows_gnu: x86_64-w64-mingw32-gcc
          AR_x86_64_pc_windows_gnu: x86_64-w64-mingw32-ar
        run: cargo build --release --locked --target "${WINDOWS_TARGET}"

      # ── RUST ADAPTER: package artifacts (+ checksums) ────────────────────
      - name: Package artifacts and SHA256SUMS
        if: ${{ steps.plan.outputs.release == 'true' }}
        run: |
          set -euo pipefail
          cp "${WORKDIR}/target/${LINUX_TARGET}/release/${BIN}"        "dist/${BIN}-linux-x86_64"
          cp "${WORKDIR}/target/${WINDOWS_TARGET}/release/${BIN}.exe"  "dist/${BIN}-windows-x86_64.exe"
          ( cd dist && sha256sum "${BIN}-linux-x86_64" "${BIN}-windows-x86_64.exe" > SHA256SUMS )
          ls -l dist && echo "----" && cat dist/SHA256SUMS

      # ── RELEASE ENGINE: commit the bump, tag, push ───────────────────────
      - name: Commit version bump and push tag
        if: ${{ steps.plan.outputs.release == 'true' }}
        run: |
          set -euo pipefail
          VERSION="${{ steps.plan.outputs.version }}"
          TAG="${{ steps.plan.outputs.tag }}"
          git config user.name  "uo-link-ci"
          git config user.email "ci@whitlocktech.com"
          git remote set-url origin \
            "https://${{ secrets.REGISTRY_USER }}:${{ secrets.REGISTRY_TOKEN }}@${GITEA_HOST}/${REPO}.git"

          git add "${WORKDIR}/Cargo.toml" "${WORKDIR}/Cargo.lock"
          if ! git diff --cached --quiet; then
            git commit -m "chore(release): bump version to ${TAG} [skip ci]"
            git push origin "HEAD:main"
          else
            echo "Version unchanged (first release) — no bump commit needed."
          fi
          git tag "${TAG}"
          git push origin "${TAG}"

      # ── RELEASE ENGINE: create the Gitea release + upload assets ─────────
      - name: Create Gitea release and upload assets
        if: ${{ steps.plan.outputs.release == 'true' }}
        run: |
          set -euo pipefail
          TAG="${{ steps.plan.outputs.tag }}"
          API="https://${GITEA_HOST}/api/v1/repos/${REPO}"
          BODY="$(cat dist/CHANGELOG.md)"

          REL_ID="$(curl -sSf -X POST "${API}/releases" \
            -H "Authorization: token ${{ secrets.REGISTRY_TOKEN }}" \
            -H "Content-Type: application/json" \
            -d "$(jq -n --arg tag "$TAG" --arg body "$BODY" \
                   '{tag_name:$tag, name:$tag, body:$body, draft:false, prerelease:false}')" \
            | jq -r '.id')"
          echo "Created release ${TAG} (id=${REL_ID})"

          for f in "${BIN}-linux-x86_64" "${BIN}-windows-x86_64.exe" SHA256SUMS; do
            curl -sSf -X POST "${API}/releases/${REL_ID}/assets?name=${f}" \
              -H "Authorization: token ${{ secrets.REGISTRY_TOKEN }}" \
              -F "attachment=@dist/${f}" >/dev/null
            echo "  uploaded ${f}"
          done