name: PR writer (label + comment)

on:
  pull_request_target:
    types: [opened, synchronize, reopened]

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

jobs:
  label:
    runs-on: ubuntu-latest
    steps:
      # Safe: labeler reads files from the base repo by default in pull_request_target context.
      # Do NOT checkout PR head.
      - uses: actions/labeler@v5
        with:
          configuration-path: .github/labeler.yml

  comment_firmware:
    runs-on: ubuntu-latest
    steps:
      - name: Find the matching CI run for this PR SHA
        id: find_run
        uses: actions/github-script@v8
        with:
          script: |
            const owner = context.repo.owner;
            const repo = context.repo.repo;
            const pr = context.payload.pull_request;
            const headSha = pr.head.sha;

            const { data } = await github.rest.actions.listWorkflowRunsForRepo({
                owner,
                repo,
                event: "pull_request",
                per_page: 50,
            });

            const run = data.workflow_runs.find(r => r.head_sha === headSha && r.name === "CI (build)");
            if (!run) core.setFailed(`No matching CI (build) run found for head_sha=${headSha}.`);

            core.setOutput("run_id", String(run.id));
            core.setOutput("run_html_url", run.html_url);

      - name: Locate artifact IDs in the CI run
        id: artifacts
        uses: actions/github-script@v8
        with:
          script: |
            const owner = context.repo.owner;
            const repo = context.repo.repo;
            const runId = Number("${{ steps.find_run.outputs.run_id }}");

            const { data } = await github.rest.actions.listWorkflowRunArtifacts({
                owner,
                repo,
                run_id: runId,
                per_page: 100,
            });

            const artifacts = data.artifacts || [];
            const fw = artifacts.find(a => a.name === "firmware-bin");
            const meta = artifacts.find(a => a.name === "build-meta");

            if (!meta) {
            core.setFailed("build-meta artifact not found in CI run artifacts.");
            return;
            }
            // firmware-bin is nice-to-have for linking; fail if you want.
            core.setOutput("fw_id", fw ? String(fw.id) : "");
            core.setOutput("meta_id", String(meta.id));

      - name: Download build-meta artifact zip and extract pio.log
        id: parse_log
        shell: bash
        env:
          OWNER: ${{ github.repository_owner }}
          REPO: ${{ github.event.repository.name }}
          META_ID: ${{ steps.artifacts.outputs.meta_id }}
          GH_TOKEN: ${{ github.token }}
        run: |
          set -euo pipefail

          # Download artifact zip via GitHub API (will redirect to blob storage; -L follows)
          api="https://api.github.com/repos/${OWNER}/${REPO}/actions/artifacts/${META_ID}/zip"
          curl -sSL \
            -H "Authorization: Bearer ${GH_TOKEN}" \
            -H "X-GitHub-Api-Version: 2022-11-28" \
            -o build-meta.zip \
            "${api}"

          mkdir -p build-meta
          unzip -q build-meta.zip -d build-meta

          if [[ ! -f build-meta/pio.log ]]; then
            echo "pio.log not found inside build-meta artifact"
            echo "ram_line=" >> "$GITHUB_OUTPUT"
            echo "flash_line=" >> "$GITHUB_OUTPUT"
            exit 0
          fi

          ram_line="$(grep -E "RAM:\\s" -m1 build-meta/pio.log || true)"
          flash_line="$(grep -E "Flash:\\s" -m1 build-meta/pio.log || true)"

          echo "ram_line=${ram_line}" >> "$GITHUB_OUTPUT"
          echo "flash_line=${flash_line}" >> "$GITHUB_OUTPUT"

      - name: Post/update PR comment with RAM/Flash + artifact links
        uses: actions/github-script@v8
        with:
          script: |
            const owner = context.repo.owner;
            const repo = context.repo.repo;
            const prNumber = context.payload.pull_request.number;

            const runId = Number("${{ steps.find_run.outputs.run_id }}");
            const runUrl = "${{ steps.find_run.outputs.run_html_url }}";

            const marker = '<!-- firmware-stats -->';
            const ram = `${{ steps.parse_log.outputs.ram_line }}`.trim();
            const flash = `${{ steps.parse_log.outputs.flash_line }}`.trim();

            const fwId = `${{ steps.artifacts.outputs.fw_id }}`.trim();
            const metaId = `${{ steps.artifacts.outputs.meta_id }}`.trim();

            const fwUrl = fwId ? `https://github.com/${owner}/${repo}/actions/runs/${runId}/artifacts/${fwId}` : null;
            const metaUrl = metaId ? `https://github.com/${owner}/${repo}/actions/runs/${runId}/artifacts/${metaId}` : null;

            const body =
              `${marker}\n**Firmware build stats**\n\n` +
              `\`\`\`\n${ram || "RAM: not found"}\n${flash || "Flash: not found"}\n\`\`\`\n\n` +
              `**Artifacts**\n` +
              `- CI run: ${runUrl}\n` +
              `- Firmware binary: ${fwUrl ? `[firmware-bin](${fwUrl})` : "artifact not found"}\n` +
              `- Build logs: ${metaUrl ? `[build-meta](${metaUrl})` : "artifact not found"}`;

            const { data: comments } = await github.rest.issues.listComments({
              owner,
              repo,
              issue_number: prNumber,
              per_page: 100,
            });

            const existing = comments.find(c => (c.body || "").includes(marker));
            if (existing) {
              await github.rest.issues.updateComment({
                owner,
                repo,
                comment_id: existing.id,
                body,
              });
            } else {
              await github.rest.issues.createComment({
                owner,
                repo,
                issue_number: prNumber,
                body,
              });
            }