// tests/e2e/system-verification.js
// Automated E2E verification script for C# .NET API Backend & BackOffice

const API_BASE = 'http://localhost:5000';

async function runE2EVerification() {
  console.log('==================================================');
  console.log(' D3RO Voice — Closed Loop E2E Automated Test');
  console.log('==================================================');

  try {
    // 1. Health & Server Stats
    console.log('\n[1/5] Testing Server Stats & Health...');
    const statsRes = await fetch(`${API_BASE}/api/admin/stats`);
    if (!statsRes.ok) throw new Error(`Stats endpoint failed with status ${statsRes.status}`);
    const stats = await statsRes.json();
    console.log('  ✓ Server Stats:', JSON.stringify(stats));

    // 2. User Registration & Login
    console.log('\n[2/5] Testing User Registration & Mandatory Login Guard...');
    const testEmail = `e2e_user_${Date.now()}@d3ro.ai`;
    const testPassword = 'Password123!';

    const regRes = await fetch(`${API_BASE}/api/auth/register`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ email: testEmail, password: testPassword })
    });
    if (!regRes.ok) throw new Error(`Registration failed: ${await regRes.text()}`);
    const regData = await regRes.json();
    console.log(`  ✓ Registration successful for: ${regData.email} (Role: ${regData.role})`);

    const loginRes = await fetch(`${API_BASE}/api/auth/login`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ email: testEmail, password: testPassword })
    });
    if (!loginRes.ok) throw new Error(`Login failed: ${await loginRes.text()}`);
    const loginData = await loginRes.json();
    const token = loginData.token;
    console.log('  ✓ Login successful, JWT token issued.');

    // Verify unauthenticated request fails
    const unauthRes = await fetch(`${API_BASE}/api/llm/generate`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ prompt: 'Test' })
    });
    if (unauthRes.status !== 401) throw new Error(`Expected 401 Unauthenticated, got ${unauthRes.status}`);
    console.log('  ✓ Mandatory Login Guard verified (Unauthenticated request rejected with 401).');

    // 3. Dynamic Model Endpoint Creation (Admin)
    console.log('\n[3/5] Testing Dynamic Service Model & Endpoint Addition...');
    const newModelId = `e2e-model-${Date.now()}`;
    const createEpRes = await fetch(`${API_BASE}/api/admin/endpoints`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        modelId: newModelId,
        modelName: 'E2E Dynamic Custom Model',
        provider: 'OpenAI',
        endpointUrl: 'https://api.openai.com/v1/chat/completions',
        apiKey: 'sk-e2e-dummy-key',
        costPer1kPromptTokens: 0.00020,
        costPer1kCompletionTokens: 0.00080
      })
    });
    if (!createEpRes.ok) throw new Error(`Endpoint creation failed: ${await createEpRes.text()}`);
    const epData = await createEpRes.json();
    console.log(`  ✓ Dynamic Model Endpoint added: ${epData.modelId}`);

    // 4. AI Generation & Usage Cost Calculation
    console.log('\n[4/5] Testing AI Generation & Token Cost Calculation...');
    const genRes = await fetch(`${API_BASE}/api/llm/generate`, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        Authorization: `Bearer ${token}`
      },
      body: JSON.stringify({
        prompt: 'Self-verification prompt for D3RO Voice E2E test',
        model: newModelId
      })
    });
    if (!genRes.ok) throw new Error(`AI generation failed: ${await genRes.text()}`);
    const genData = await genRes.json();
    console.log('  ✓ AI Generation result:', JSON.stringify(genData));
    if (typeof genData.cost !== 'number') throw new Error('Cost calculation missing in response');

    // 5. BackOffice Usage & Cost Analytics Report
    console.log('\n[5/5] Testing BackOffice Usage & Cost Analytics Report...');
    const usageRes = await fetch(`${API_BASE}/api/admin/usage`);
    if (!usageRes.ok) throw new Error(`Usage report failed: ${await usageRes.text()}`);
    const usageData = await usageRes.json();
    console.log('  ✓ Usage Report received:', JSON.stringify(usageData));

    console.log('\n==================================================');
    console.log(' SUCCESS: ALL E2E VERIFICATION CHECKS PASSED!');
    console.log('==================================================');
  } catch (err) {
    console.error('\n❌ E2E VERIFICATION FAILED:', err);
    process.exit(1);
  }
}

runE2EVerification();