name: Preview release template

on:
  workflow_dispatch:

jobs:
  variables:
    runs-on: ubuntu-latest
    outputs:
      build_date: ${{ steps.result.outputs.build_date }}
      build_tag: ${{ steps.result.outputs.build_tag }}
      last_rev: ${{ steps.result.outputs.last_rev }}
      last_tag: ${{ steps.result.outputs.last_tag }}

    steps:
      - name: Prepare version variables
        id: result
        shell: bash
        run: |
          remote_last_tag() {
            git ls-remote --tags --sort='version:refname' https://github.com/xoseperez/espurna.git 'github*' |\
              cut -d'/' -f3 |\
              grep -o -E '^github[0-9]{6}$' |\
              sort -r |\
              head -1
          }

          remote_revision() {
            git ls-remote --exit-code --heads https://github.com/xoseperez/espurna.git refs/heads/$1 | cut -d$'\t' -f1
          }

          date=$(date +'%y%m%d')
          echo "build_date=${date}" >> "$GITHUB_OUTPUT"

          tag="github${date}"
          echo "build_tag=${tag}" >> "$GITHUB_OUTPUT"

          dev=$(remote_revision dev)
          echo "last_rev=${dev}" >> "$GITHUB_OUTPUT"

          last=$(remote_last_tag)
          echo "last_tag=${last}" >> "$GITHUB_OUTPUT"

  build:
    needs: variables
    runs-on: ubuntu-latest
    strategy:
      matrix:
        id: [0, 1, 2, 3]
    steps:
      - uses: actions/checkout@v4
        with:
          path: espurna

      - uses: actions/setup-python@v5
        with:
          python-version: '3.x'

      - name: Build
        run: |
          echo "build_date=" ${{ needs.variables.outputs.build_date }}
          echo "build_tag=" ${{ needs.variables.outputs.build_tag }}
          echo "last_rev=" ${{ needs.variables.outputs.last_rev }}
          echo "last_tag=" ${{ needs.variables.outputs.last_tag }}

          pushd espurna/code
          # github actions allow empty / non-existent output names. check manually
          build_date=${{ needs.variables.outputs.build_date }}
          test -n "$build_date" || exit 2
          # each 'id' in matrix only builds every Nth environment
          ./scripts/generate_release_sh.py \
              --ignore secure-client \
              --destination ${GITHUB_WORKSPACE}/build \
              --builder-id ${{ strategy.job-index }} \
              --builder-total ${{ strategy.job-total }} \
              --suffix github${build_date}
          popd

  release:
    needs: [variables, build]
    runs-on: ubuntu-latest
    steps:
      - name: Fetch release template
        run: |
          curl \
            -H "Authorization: Bearer ${{ github.token }}" \
            -H "Accept: application/vnd.github.VERSION.raw" \
            -o release_template.md \
            https://api.github.com/repos/xoseperez/espurna/contents/.github/release_template.md

      - name: Render release template
        run: |
          echo "build_date=" ${{ needs.variables.outputs.build_date }}
          echo "build_tag=" ${{ needs.variables.outputs.build_tag }}
          echo "last_rev=" ${{ needs.variables.outputs.last_rev }}
          echo "last_tag=" ${{ needs.variables.outputs.last_tag }}

          sed \
            -i \
            -e 's/\$\$BUILD_TAG\$\$/'${{ needs.variables.outputs.build_tag }}'/g' \
            -e 's/\$\$LAST_TAG\$\$/'${{ needs.variables.outputs.last_tag }}'/g' \
            release_template.md

      - uses: actions/upload-artifact@v4
        with:
          name: release_template.md
          path: release_template.md