name: "Releasing PR"

on:
  pull_request:
    types: [closed]
    paths-ignore:
      - 'docs/**/*'

# Cancel in‑flight runs for the same PR when a new push arrives.
concurrency:
  group: pr-${{ github.workflow }}-${{ github.event.pull_request.number }}
  cancel-in-progress: true

jobs:
  finalize:
    name: Finalize Release
    runs-on: [self-hosted]
    permissions:
      contents: write

    if: |
      github.event.pull_request.merged == true &&
      contains(github.event.pull_request.labels.*.name, 'release')

    steps:
      - name: Generate GitHub App token
        id: app-token
        uses: actions/create-github-app-token@v1
        with:
          app-id: ${{ secrets.COZYSTACK_CI_APP_ID }}
          private-key: ${{ secrets.COZYSTACK_CI_PRIVATE_KEY }}
          owner: cozystack

      # Extract tag from branch name  (branch = release-X.Y.Z*)
      - name: Extract tag from branch name
        id: get_tag
        uses: actions/github-script@v7
        with:
          script: |
            const branch = context.payload.pull_request.head.ref;
            const m = branch.match(/^release-(\d+\.\d+\.\d+(?:[-\w\.]+)?)$/);
            if (!m) {
              core.setFailed(`Branch '${branch}' does not match 'release-X.Y.Z[-suffix]'`);
              return;
            }
            const tag = `v${m[1]}`;
            core.setOutput('tag', tag);
            console.log(`✅ Tag to publish: ${tag}`);

      # Checkout repo & create / push annotated tag
      - name: Checkout repo
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Create tag on merge commit
        env:
          APP_TOKEN: ${{ steps.app-token.outputs.token }}
        run: |
          git config user.name  "cozystack-ci[bot]"
          git config user.email "274107086+cozystack-ci[bot]@users.noreply.github.com"
          git remote set-url origin https://x-access-token:${APP_TOKEN}@github.com/${GITHUB_REPOSITORY}
          git tag -f ${{ steps.get_tag.outputs.tag }} ${{ github.sha }}
          git push -f origin ${{ steps.get_tag.outputs.tag }}

      # Ensure maintenance branch release-X.Y
      - name: Ensure maintenance branch release-X.Y
        uses: actions/github-script@v7
        with:
          github-token: ${{ steps.app-token.outputs.token }}
          script: |
            const tag = '${{ steps.get_tag.outputs.tag }}';  // e.g. v0.1.3 or v0.1.3-rc3
            const match = tag.match(/^v(\d+)\.(\d+)\.\d+(?:[-\w\.]+)?$/);
            if (!match) {
              core.setFailed(`❌ tag '${tag}' must match 'vX.Y.Z' or 'vX.Y.Z-suffix'`);
              return;
            }
            const line = `${match[1]}.${match[2]}`;
            const branch = `release-${line}`;

            // Get main branch commit for the tag
            const ref = await github.rest.git.getRef({
              owner: context.repo.owner,
              repo:  context.repo.repo,
              ref:   `tags/${tag}`
            });

            const commitSha = ref.data.object.sha;

            try {
              await github.rest.repos.getBranch({
                owner: context.repo.owner,
                repo: context.repo.repo,
                branch
              });
           
              await github.rest.git.updateRef({
                owner: context.repo.owner,
                repo: context.repo.repo,
                ref: `heads/${branch}`,
                sha: commitSha,
                force: true
              });
              console.log(`🔁 Force-updated '${branch}' to ${commitSha}`);
            } catch (err) {
              if (err.status === 404) {
                await github.rest.git.createRef({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  ref: `refs/heads/${branch}`,
                  sha: commitSha
                });
                console.log(`✅ Created branch '${branch}' at ${commitSha}`);
              } else {
                console.error('Unexpected error --', err);
                core.setFailed(`Unexpected error creating/updating branch: ${err.message}`);
                throw err;
              }
            }

      # Publish draft release and ensure correct latest flag
      - name: Publish draft release
        uses: actions/github-script@v7
        with:
          github-token: ${{ steps.app-token.outputs.token }}
          script: |
            const tag = '${{ steps.get_tag.outputs.tag }}';
            const m = tag.match(/^v(\d+\.\d+\.\d+)(-(?:alpha|beta|rc)\.\d+)?$/);
            if (!m) {
              core.setFailed(`❌ tag '${tag}' must match 'vX.Y.Z' or 'vX.Y.Z-(alpha|beta|rc).N'`);
              return;
            }
            const isRc = Boolean(m[2]);

            // Parse semver string to comparable numbers
            function parseSemver(v) {
              const match = v.replace(/^v/, '').match(/^(\d+)\.(\d+)\.(\d+)/);
              if (!match) return null;
              return {
                major: parseInt(match[1]),
                minor: parseInt(match[2]),
                patch: parseInt(match[3])
              };
            }

            // Compare two semver objects
            function compareSemver(a, b) {
              if (a.major !== b.major) return a.major - b.major;
              if (a.minor !== b.minor) return a.minor - b.minor;
              return a.patch - b.patch;
            }

            const currentSemver = parseSemver(tag);

            // Get all releases
            const releases = await github.rest.repos.listReleases({
              owner: context.repo.owner,
              repo: context.repo.repo,
              per_page: 100
            });

            // Find draft release to publish
            const draft = releases.data.find(r => r.tag_name === tag && r.draft);
            if (!draft) throw new Error(`Draft release for ${tag} not found`);

            // Find max semver among published releases (excluding current draft)
            const publishedReleases = releases.data
              .filter(r => !r.draft && !r.prerelease)
              .filter(r => /^v\d+\.\d+\.\d+$/.test(r.tag_name))
              .map(r => ({ id: r.id, tag: r.tag_name, semver: parseSemver(r.tag_name) }))
              .filter(r => r.semver !== null);

            let maxRelease = null;
            for (const rel of publishedReleases) {
              if (!maxRelease || compareSemver(rel.semver, maxRelease.semver) > 0) {
                maxRelease = rel;
              }
            }

            // Determine if this release should be latest
            const isOutdated = maxRelease && compareSemver(currentSemver, maxRelease.semver) < 0;
            const makeLatest = (isRc || isOutdated) ? 'false' : 'true';

            if (isRc) {
              console.log(`🏷️  ${tag} is a prerelease, make_latest: false`);
            } else if (isOutdated) {
              console.log(`🏷️  ${tag} < ${maxRelease.tag} (max semver), make_latest: false`);
            } else {
              console.log(`🏷️  ${tag} is the highest version, make_latest: true`);
            }

            // Publish the release
            await github.rest.repos.updateRelease({
              owner: context.repo.owner,
              repo: context.repo.repo,
              release_id: draft.id,
              draft: false,
              prerelease: isRc,
              make_latest: makeLatest
            });
            console.log(`🚀 Published release ${tag}`);

            // If this is a backport/outdated release, ensure the correct release is marked as latest
            if (isOutdated && maxRelease) {
              console.log(`🔧 Ensuring ${maxRelease.tag} remains the latest release...`);
              await github.rest.repos.updateRelease({
                owner: context.repo.owner,
                repo: context.repo.repo,
                release_id: maxRelease.id,
                make_latest: 'true'
              });
              console.log(`✅ Restored ${maxRelease.tag} as latest release`);
            }