name: PR Build (Comment Triggered)

on:
  issue_comment:
    types: [created]

concurrency:
  group: pr-build-${{ github.event.issue.number }}
  cancel-in-progress: true

permissions:
  issues: write
  pull-requests: write
  actions: read

jobs:
  validate:
    runs-on: ubuntu-latest
    if: github.event.issue.pull_request != null
    outputs:
      build_windows: ${{ steps.parse.outputs.build_windows }}
      pr_ref: ${{ steps.parse.outputs.pr_ref }}
      pr_sha: ${{ steps.parse.outputs.pr_sha }}
      pr_number: ${{ steps.parse.outputs.pr_number }}

    steps:
      - name: Parse command and check permissions
        id: parse
        uses: actions/github-script@v7
        with:
          script: |
            const comment = context.payload.comment.body.trim();

            // Parse supported commands
            const commands = {
              '/build-windows': 'build_windows'
            };

            const command = commands[comment];
            if (!command) {
              console.log(`Comment "${comment}" is not a recognized build command, skipping.`);
              core.setOutput('build_windows', 'false');
              return;
            }

            try {
              await github.rest.reactions.createForIssueComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                comment_id: context.payload.comment.id,
                content: 'eyes'
              });
            } catch (e) {
              console.log(`Could not add reaction: ${e}`);
            }

            // Fetch PR details
            const pr = await github.rest.pulls.get({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.issue.number
            });

            // Verify PR is open
            if (pr.data.state !== 'open') {
              console.log('PR is not open, skipping.');
              core.setOutput('build_windows', 'false');
              return;
            }

            // Block fork PRs — fork code should not run with access to secrets
            const isFork = pr.data.head.repo.full_name !== context.repo.owner + '/' + context.repo.repo;
            if (isFork) {
              console.log(`PR is from fork ${pr.data.head.repo.full_name}, blocking build.`);
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.issue.number,
                body: 'On-demand builds are not available for PRs from forks.'
              });
              core.setOutput('build_windows', 'false');
              return;
            }

            // Verify commenter has write access
            let permission = 'none';
            try {
              const resp = await github.rest.repos.getCollaboratorPermissionLevel({
                owner: context.repo.owner,
                repo: context.repo.repo,
                username: context.payload.comment.user.login
              });
              permission = resp.data.permission;
            } catch (_) {}

            if (!['admin', 'write'].includes(permission)) {
              console.log(`User ${context.payload.comment.user.login} has '${permission}' permission — insufficient.`);
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.issue.number,
                body: `@${context.payload.comment.user.login} Only collaborators with write access can trigger builds.`
              });
              core.setOutput('build_windows', 'false');
              return;
            }

            console.log(`User ${context.payload.comment.user.login} has '${permission}' permission — proceeding with ${command}.`);
            core.setOutput(command, 'true');

            // Export PR details for downstream jobs
            core.setOutput('pr_ref', pr.data.head.ref);
            core.setOutput('pr_sha', pr.data.head.sha);
            core.setOutput('pr_number', String(pr.data.number));

  build-frontend:
    needs: validate
    if: needs.validate.outputs.build_windows == 'true'
    uses: ./.github/workflows/build-frontend.yml
    with:
      ref: ${{ needs.validate.outputs.pr_ref }}
    secrets: inherit

  build-windows:
    needs: [validate, build-frontend]
    if: needs.validate.outputs.build_windows == 'true'
    uses: ./.github/workflows/build-windows-installer.yml
    with:
      ref: ${{ needs.validate.outputs.pr_ref }}
    secrets: inherit

  post-result:
    needs: [validate, build-windows]
    if: always() && needs.validate.outputs.build_windows == 'true'
    runs-on: ubuntu-latest

    steps:
      - name: Post result comment
        uses: actions/github-script@v7
        with:
          script: |
            const buildResult = '${{ needs.build-windows.result }}';
            const runUrl = `https://github.com/${context.repo.owner}/${context.repo.repo}/actions/runs/${context.runId}`;
            const prRef = '${{ needs.validate.outputs.pr_ref }}';
            const prSha = '${{ needs.validate.outputs.pr_sha }}';
            const shortSha = prSha.substring(0, 7);

            // Skip comment for skipped builds
            if (buildResult === 'skipped') {
              console.log('Build was skipped, no comment needed.');
              return;
            }

            let body;
            if (buildResult === 'success') {
              body = [
                `Windows installer build **succeeded** for \`${prRef}\` (\`${shortSha}\`).`,
                ``,
                `**Download:** open the [workflow run](${runUrl}), scroll to the **Artifacts** section at the bottom.`,
                `The artifact \`Cleanuparr-windows-installer\` is retained for 30 days.`
              ].join('\n');
            } else if (buildResult === 'cancelled') {
              body = [
                `Windows installer build was **cancelled** for \`${prRef}\` (\`${shortSha}\`).`,
                ``,
                `See the [workflow run](${runUrl}) for details.`
              ].join('\n');
            } else {
              body = [
                `Windows installer build **failed** for \`${prRef}\` (\`${shortSha}\`).`,
                ``,
                `See the [workflow run](${runUrl}) for details.`
              ].join('\n');
            }

            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: parseInt('${{ needs.validate.outputs.pr_number }}'),
              body
            });