# Inspired from https://github.com/Shopify/quilt/blob/main/.github/workflows/snapit.yml
name: Snapshot This

on:
  issue_comment:
    types:
      - created

concurrency: ${{ github.workflow }}-${{ github.ref }}

jobs:
  snapshot:
    name: Snapshot Release
    if: |
      github.event.issue.pull_request &&
      github.event.comment.body == '/snapshot-this'
    runs-on: ubuntu-latest
    steps:
      - name: Validate pull request
        uses: actions/github-script@v6
        with:
          script: |
            try {
              // Add a rocket reaction to the comment
              await github.rest.reactions.createForIssueComment({
                ...context.repo,
                comment_id: context.payload.comment.id,
                content: 'rocket',
              })

              // Only allow comment creators who have "write" permissions to repo
              const actorPermission = (await github.rest.repos.getCollaboratorPermissionLevel({
                ...context.repo,
                username: context.actor
              })).data.permission
              const isPermitted = ['write', 'admin'].includes(actorPermission)
              if (!isPermitted) {
                const errorMessage = 'Only users with write permission to the respository can run /snapshot-this'
                await github.rest.issues.createComment({
                  ...context.repo,
                  issue_number: context.issue.number,
                  body: errorMessage,
                })
                core.setFailed(errorMessage)
                return;
              }

              const pullRequest = await github.rest.pulls.get({
                ...context.repo,
                pull_number: context.issue.number,
              })
              // Pull request from fork
              if (context.payload.repository.full_name !== pullRequest.data.head.repo.full_name) {
                const errorMessage = '`/snapshot-this` is not supported on pull requests from forked repositories.'
                await github.rest.issues.createComment({
                  ...context.repo,
                  issue_number: context.issue.number,
                  body: errorMessage,
                })
                core.setFailed(errorMessage)
              }
            } catch (err) {
              core.setFailed(`Request failed with error ${err}`)
            }
      - name: Checkout pull request branch
        uses: actions/checkout@v3
        with:
          ref: ${{ format('refs/pull/{0}/merge', github.event.issue.number) }}

      # Because changeset entries are consumed and removed on the
      # 'changeset-release/main' branch, we need to reset the files
      # so the following 'changeset version --snapshot' command will
      # regenerate the package version bumps with the snapshot releases
      - name: Reset changeset entries on changeset-release/main branch
        run: |
          if [[ $(git branch --show-current) == 'changeset-release/main' ]]; then
            git checkout origin/main -- .changeset
          fi
      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: 20
          cache: "yarn"

      - name: Install dependencies
        uses: ./.github/actions/cache-deps
        with:
          extension: snapshot-this
          skip-build: "true"

      - name: Build Packages
        shell: "bash"
        run: yarn build

      - name: Create an .npmrc
        env:
          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
        run: |
          cat << EOF > "$HOME/.npmrc"
            //registry.npmjs.org/:_authToken=$NPM_TOKEN
          EOF

      - name: Create and publish snapshot release
        uses: actions/github-script@v6
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          script: |
            await exec.exec('yarn run changeset version --snapshot snapshot')
            const {stdout} = await exec.getExecOutput('yarn run release:snapshot')
            const newTags = Array
              .from(stdout.matchAll(/New tag:\s+([^\s\n]+)/g))
              .map(([_, tag]) => tag)
            if (newTags.length) {
              const multiple = newTags.length > 1
              const body = (
                `#### :rocket: A snapshot release has been made for this PR\n\n` +
                `Test the snapshot${multiple ? 's' : ''} by updating your \`package.json\` ` +
                `with the newly published version${multiple ? 's' : ''}:\n` +
                newTags.map(tag => (
                  '```sh\n' +
                  `yarn add ${tag}\n` +
                  '```'
                )).join('\n') +
                `\n\n> Latest commit: ${context.sha}`

              )
              await github.rest.issues.createComment({
                ...context.repo,
                issue_number: context.issue.number,
                body,
              })
              await github.rest.reactions.createForIssueComment({
                ...context.repo,
                comment_id: context.payload.comment.id,
                content: 'hooray',
              })
            }