# Puts the downloadable builds on the repository's Releases page.
#
# Nothing here leaves GitHub: a release is exactly as visible as the repository it sits
# on. This is *not* the PyPI publish — that is `release.yml`, it is a separate act, and it
# does not run from here.
#
# Triggered by pushing a version tag, which is the moment a release exists in git anyway:
#
#     git tag -a v0.3.0 -m "MeshTerm 0.3.0"
#     git push origin v0.3.0
#
# The binaries are built by `installers.yml`, called rather than copied, so the files
# people download are made exactly the way the ones CI checks on every push are.
#
# Once the release exists, `website` puts it on meshterm.net: it rebuilds that site from
# the tagged tree — the landing and About pages carry the version — and pushes the result
# to jpmartineau/meshterm.net, which GitHub Pages serves. It writes with a deploy key
# scoped to that one repository (secret SITE_DEPLOY_KEY); that repo's README makes one.
name: GitHub release

on:
  push:
    tags: ["v*"]
  workflow_dispatch:
    inputs:
      tag:
        description: "Existing tag to build a release from (e.g. v0.2.0)"
        required: true
        type: string
      prerelease:
        description: "Mark as a pre-release (keeps it out of 'Latest')"
        type: boolean
        default: false

permissions:
  contents: read

jobs:
  build:
    uses: ./.github/workflows/installers.yml

  publish:
    name: create the release
    needs: build
    runs-on: ubuntu-latest
    timeout-minutes: 10
    permissions:
      # The one job that needs it: creating a release writes to the repository.
      contents: write
    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ inputs.tag || github.ref }}

      # Every platform's artifact, flattened into one directory of files to attach.
      - uses: actions/download-artifact@v4
        with:
          # The build uploads one artifact nobody should ever download: the unsigned
          # Windows binary it hands to SignPath. Everything meant for the release page is
          # named `meshterm-…`, so the pattern is the filter.
          pattern: meshterm-*
          path: artifacts
          merge-multiple: true

      - name: Gather the binaries and their checksums
        id: gather
        shell: bash
        run: |
          mkdir -p release
          find artifacts -type f -exec mv {} release/ \;
          ls -lh release/
          # One combined checksum file is easier to verify against than five loose ones.
          (cd release && cat *.sha256 > SHA256SUMS && rm -f *.sha256)
          tag="${{ inputs.tag || github.ref_name }}"
          echo "tag=$tag" >> "$GITHUB_OUTPUT"
          echo "version=${tag#v}" >> "$GITHUB_OUTPUT"

      - name: Take the release notes from the changelog
        id: notes
        shell: bash
        env:
          VERSION: ${{ steps.gather.outputs.version }}
        run: |
          # The section for this version, between its own heading and the next one. If the
          # changelog has nothing for it, say so plainly rather than inventing notes.
          #
          # Extracted once, into the file, and the *file* is what gets tested. It used to
          # run twice — once down a `| sed | head -1 | grep -q .` pipeline to decide, then
          # again for real — and this step runs under `bash -e -o pipefail`, where that
          # pipeline is a race it can lose. `head -1` exits the moment it has its line and
          # closes the pipe; if `sed` still has bytes to write it dies on SIGPIPE, pipefail
          # promotes that to a failed condition, and a version with a perfectly good
          # changelog section publishes "No changelog entry" instead. It only bites once a
          # section outgrows one buffered write, which is why every entry under 4 KB was
          # fine and 0.3.1 was not — while 0.3.0, the same size, happened to win.
          awk -v v="$VERSION" '
              $0 ~ "^## \\[" v "\\]" {found=1; next}
              found && /^## \[/ {exit}
              found {print}
            ' CHANGELOG.md > notes.md
          if ! grep -q '[^[:space:]]' notes.md; then
            echo "No changelog entry for $VERSION." > notes.md
          fi
          echo "--- notes ---"; cat notes.md

      - name: Create it
        env:
          GH_TOKEN: ${{ github.token }}
          TAG: ${{ steps.gather.outputs.tag }}
          PRERELEASE: ${{ inputs.prerelease && '--prerelease' || '' }}
        run: |
          gh release create "$TAG" release/* \
            --title "MeshTerm ${TAG#v}" \
            --notes-file notes.md \
            --verify-tag \
            $PRERELEASE
          echo "https://github.com/${{ github.repository }}/releases/tag/$TAG"

  website:
    name: put the version on meshterm.net
    needs: publish
    # A pre-release stays out of "Latest", so it stays off the landing page too.
    if: ${{ !inputs.prerelease }}
    runs-on: ubuntu-latest
    timeout-minutes: 10
    steps:
      - name: Check for the deploy key
        env:
          SITE_DEPLOY_KEY: ${{ secrets.SITE_DEPLOY_KEY }}
        run: |
          if [ -z "$SITE_DEPLOY_KEY" ]; then
            echo "::error::SITE_DEPLOY_KEY is not set; the meshterm.net README says how to make it."
            exit 1
          fi

      - uses: actions/checkout@v4
        with:
          ref: ${{ inputs.tag || github.ref }}
          path: meshterm

      - uses: actions/checkout@v4
        with:
          repository: jpmartineau/meshterm.net
          ssh-key: ${{ secrets.SITE_DEPLOY_KEY }}
          path: site

      - uses: actions/setup-python@v5
        with:
          python-version: "3.12"

      - name: Rebuild the site from this release
        run: |
          python -m pip install --quiet -r site/requirements.txt
          python site/build.py --meshterm meshterm

      - name: Publish it
        working-directory: site
        env:
          TAG: ${{ inputs.tag || github.ref_name }}
        run: |
          git add -A
          if git diff --cached --quiet; then
            echo "meshterm.net already shows ${TAG#v}."
            exit 0
          fi
          git config user.name "github-actions[bot]"
          git config user.email "41898341+github-actions[bot]@users.noreply.github.com"
          git commit -m "MeshTerm ${TAG#v}"
          git push