name: Release mirrored AI Toolkit

on:
  push:
    branches:
      - main
    paths:
      - package.json
      - CHANGELOG.md

jobs:
  release:
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - name: Checkout public mirror
        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
        with:
          fetch-depth: 0
          persist-credentials: false

      - name: Resolve release metadata
        id: release
        shell: bash
        run: |
          set -euo pipefail

          VERSION=$(node -p "require('./package.json').version")
          if [[ ! "$VERSION" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
            echo "Expected a major.minor.patch version, got: $VERSION" >&2
            exit 1
          fi

          TAG="v${VERSION}"
          NOTES_FILE="${RUNNER_TEMP}/release-notes.md"

          node - "$VERSION" "$NOTES_FILE" <<'NODE'
          const fs = require("node:fs");

          const [, , version, outputPath] = process.argv;
          const changelog = fs.readFileSync("CHANGELOG.md", "utf8");
          const heading = `## ${version}`;
          const start = changelog.indexOf(heading);

          if (start === -1) {
            throw new Error(`Could not find changelog section for ${version}`);
          }

          const bodyStart = start + heading.length;
          const nextVersionStart = changelog.indexOf("\n## ", bodyStart);
          const notes = changelog
            .slice(bodyStart, nextVersionStart === -1 ? undefined : nextVersionStart)
            .trim();

          fs.writeFileSync(outputPath, `${notes || `Release ${version}`}\n`);
          NODE

          echo "tag=$TAG" >> "$GITHUB_OUTPUT"
          echo "notes_file=$NOTES_FILE" >> "$GITHUB_OUTPUT"

      - name: Create tag and GitHub release
        shell: bash
        env:
          GH_TOKEN: ${{ github.token }}
          NOTES_FILE: ${{ steps.release.outputs.notes_file }}
          TAG: ${{ steps.release.outputs.tag }}
        run: |
          set -euo pipefail

          if gh release view "$TAG" --repo "$GITHUB_REPOSITORY" >/dev/null 2>&1; then
            echo "Release $TAG already exists."
            exit 0
          fi

          if git show-ref --verify --quiet "refs/tags/$TAG"; then
            TARGET_ARGS=(--verify-tag)
          else
            TARGET_ARGS=(--target "$GITHUB_SHA")
          fi

          gh release create "$TAG" \
            --repo "$GITHUB_REPOSITORY" \
            "${TARGET_ARGS[@]}" \
            --title "$TAG" \
            --notes-file "$NOTES_FILE"