import { describe, it, expect } from 'vitest';

/**
 * Pure function test: adminRouting parsing logic
 * Core parsing logic extracted from connectionStore.ts
 */
function parseAdminRouting(raw: string | null): 'relay' | 'local' | null {
  if (!raw) return null;
  try {
    const parsed = JSON.parse(raw);
    if (parsed && typeof parsed === 'object' && 'llm_routing' in parsed) {
      const routing = parsed.llm_routing;
      if (routing === 'relay' || routing === 'local') return routing;
    }
    return null;
  } catch {
    return null;
  }
}

describe('parseAdminRouting', () => {
  it('returns "relay" for valid relay config', () => {
    expect(parseAdminRouting('{"llm_routing":"relay"}')).toBe('relay');
  });

  it('returns "local" for valid local config', () => {
    expect(parseAdminRouting('{"llm_routing":"local"}')).toBe('local');
  });

  it('returns null for null input', () => {
    expect(parseAdminRouting(null)).toBeNull();
  });

  it('returns null for empty string', () => {
    expect(parseAdminRouting('')).toBeNull();
  });

  it('returns null for malformed JSON', () => {
    expect(parseAdminRouting('{not json}')).toBeNull();
  });

  it('returns null for missing llm_routing field', () => {
    expect(parseAdminRouting('{"name":"test"}')).toBeNull();
  });

  it('returns null for invalid routing value', () => {
    expect(parseAdminRouting('{"llm_routing":"invalid"}')).toBeNull();
  });

  it('returns null for number routing value', () => {
    expect(parseAdminRouting('{"llm_routing":123}')).toBeNull();
  });
});