{
  "action": "apply_suggestions",
  "project_id": "myproject",
  "merge_request_iid": 42,
  "suggestion_ids": [12345, 12346, 12347],
  "commit_message": "Apply code review suggestions"
}

// src/entities/mrs/schema.ts

// Add to ManageMrDiscussionSchema discriminated union:

const ApplySuggestionSchema = z.object({
  action: z.literal("apply_suggestion").describe("Apply a single code suggestion"),
  project_id: projectIdField,
  merge_request_iid: mergeRequestIidField,
  suggestion_id: requiredId.describe("ID of the suggestion to apply"),
  commit_message: z.string().optional().describe("Custom commit message for the apply commit"),
});

const ApplySuggestionsSchema = z.object({
  action: z.literal("apply_suggestions").describe("Batch apply multiple code suggestions"),
  project_id: projectIdField,
  merge_request_iid: mergeRequestIidField,
  suggestion_ids: z.array(z.number()).min(1).describe("Array of suggestion IDs to apply"),
  commit_message: z.string().optional().describe("Custom commit message for the apply commit"),
});

// src/entities/mrs/registry.ts - in manage_mr_discussion handler

case "apply_suggestion": {
  const { project_id, merge_request_iid, suggestion_id, commit_message } = input;
  const encodedProjectId = encodeURIComponent(project_id);

  const body: Record<string, unknown> = {};
  if (commit_message) {
    body.commit_message = commit_message;
  }

  return gitlab.put(
    `projects/${encodedProjectId}/merge_requests/${merge_request_iid}/suggestions/${suggestion_id}/apply`,
    { body: Object.keys(body).length > 0 ? body : undefined, contentType: "json" }
  );
}

case "apply_suggestions": {
  const { project_id, merge_request_iid, suggestion_ids, commit_message } = input;
  const encodedProjectId = encodeURIComponent(project_id);

  const body: Record<string, unknown> = {
    ids: suggestion_ids,
  };
  if (commit_message) {
    body.commit_message = commit_message;
  }

  return gitlab.put(
    `projects/${encodedProjectId}/merge_requests/${merge_request_iid}/suggestions/batch_apply`,
    { body, contentType: "json" }
  );
}

describe("manage_mr_discussion", () => {
  describe("apply_suggestion", () => {
    it("applies a single suggestion", async () => {
      mockEnhancedFetch.mockResolvedValueOnce({
        id: 12345,
        applied: true,
      });

      const result = await handler({
        action: "apply_suggestion",
        project_id: "test/project",
        merge_request_iid: 42,
        suggestion_id: 12345,
      });

      expect(mockEnhancedFetch).toHaveBeenCalledWith(
        expect.stringContaining("/suggestions/12345/apply"),
        expect.objectContaining({ method: "PUT" })
      );
    });

    it("includes custom commit message when provided", async () => {
      // ...
    });
  });

  describe("apply_suggestions", () => {
    it("batch applies multiple suggestions", async () => {
      // ...
    });
  });
});

describe("suggestion workflow", () => {
  it("creates suggestion and applies it", async () => {
    // 1. Create MR with changes
    // 2. Add discussion with suggestion
    // 3. Apply suggestion
    // 4. Verify commit was created
  });
});