name: Pre-release - Build and publish docs

on:
  push:
    tags:
      - "v*"
  workflow_dispatch:

permissions:
  contents: write

jobs:
  prerelease:
    if: >
      startsWith(github.ref_name, 'v')
      && contains(github.ref_name, '-rc')}}
    runs-on: ubuntu-latest

    steps:
      - name: Checkout (tag)
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Ensure tag commit is on release-candidate
        run: |
          set -euo pipefail
          git fetch origin release-candidate:refs/remotes/origin/release-candidate
          if ! git merge-base --is-ancestor "${GITHUB_SHA}" "origin/release-candidate"; then
            echo "ERROR: Tagged commit ${GITHUB_SHA} is not on release-candidate. Refusing prerelease."
            exit 1
          fi

      - name: Setup Python
        uses: actions/setup-python@v5
        with:
          python-version: "3.13"
          cache: "pip"
          cache-dependency-path: mkdocs/requirements.txt

      - name: Install dependencies
        run: |
          set -euo pipefail
          pip install -r mkdocs/requirements.txt

      - name: CI gate (MKDOCS_STRICT)
        run: |
          set -euo pipefail

          MKDOCS_STRICT="${MKDOCS_STRICT:-true}"
          STRICT_FLAG=""
          if [ "${MKDOCS_STRICT}" = "true" ]; then
            STRICT_FLAG="--strict"
          fi

          OFFLINE=true mkdocs build ${STRICT_FLAG} -f mkdocs/mkdocs.yml

      - name: Build artifact (non-strict)
        env:
          MKDOCS_STRICT: "false"
        run: |
          set -euo pipefail

          MKDOCS_STRICT="${MKDOCS_STRICT:-true}"
          STRICT_FLAG=""
          if [ "${MKDOCS_STRICT}" = "true" ]; then
            STRICT_FLAG="--strict"
          fi

          mkdir -p "${RUNNER_TEMP}/dist"
          OFFLINE=true mkdocs build ${STRICT_FLAG} -f mkdocs/mkdocs.yml -d "${RUNNER_TEMP}/dist/${{ github.ref_name }}"

      - name: Zip artifact
        run: |
          set -euo pipefail
          cd "${RUNNER_TEMP}/dist"
          zip -r "${{ github.ref_name }}.zip" "./${{ github.ref_name }}"

      - name: Publish prerelease (skip on act)
        if: ${{ env.ENABLE_RELEASE == 'true' && env.ACT != 'true' }}
        uses: softprops/action-gh-release@v2
        with:
          prerelease: true
          files: |
            ${{ runner.temp }}/dist/${{ github.ref_name }}.zip