import { describe, it, expect, beforeAll, afterAll } from 'vitest';
import request from 'supertest';
import express from 'express';
import cors from 'cors';
import { mkdirSync, existsSync, rmSync } from 'fs';
import { join } from 'path';
import Database from 'better-sqlite3';

const testDbPath = join(process.cwd(), 'tests', 'integration', 'test.db');
let app;
let db;

function setupTestDB() {
  const dbDir = join(process.cwd(), 'tests', 'integration');
  if (!existsSync(dbDir)) {
    mkdirSync(dbDir, { recursive: true });
  }
  
  if (existsSync(testDbPath)) {
    rmSync(testDbPath);
  }
  
  db = new Database(testDbPath);
  
  db.exec(`
    CREATE TABLE IF NOT EXISTS cv_data (
      id INTEGER PRIMARY KEY CHECK (id = 1),
      data TEXT NOT NULL,
      updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
    )
  `);
  
  const defaultData = {
    personal: { name: 'Test User', title: 'Developer', email: 'test@test.com' },
    experience: [],
    skills: {},
    education: [],
    projects: []
  };
  
  db.prepare('INSERT INTO cv_data (id, data) VALUES (1, ?)').run(JSON.stringify(defaultData));
}

function createTestApp() {
  const app = express();
  app.use(cors());
  app.use(express.json());
  
  app.get('/api/cv', (req, res) => {
    const row = db.prepare('SELECT data FROM cv_data WHERE id = 1').get();
    if (!row) return res.status(404).json({ error: 'CV data not found' });
    res.json(JSON.parse(row.data));
  });
  
  app.put('/api/cv', (req, res) => {
    const data = req.body;
    if (!data?.personal?.name) {
      return res.status(400).json({ error: 'personal.name is required' });
    }
    db.prepare('UPDATE cv_data SET data = ?, updated_at = CURRENT_TIMESTAMP WHERE id = 1')
      .run(JSON.stringify(data));
    res.json({ success: true, message: 'CV data updated' });
  });
  
  app.get('/api/cv/export', (req, res) => {
    const row = db.prepare('SELECT data FROM cv_data WHERE id = 1').get();
    res.setHeader('Content-Type', 'application/json');
    res.setHeader('Content-Disposition', 'attachment; filename="cv.json"');
    res.send(row.data);
  });
  
  app.post('/api/cv/import', (req, res) => {
    const data = req.body;
    if (!data?.personal?.name) {
      return res.status(400).json({ error: 'personal.name is required' });
    }
    db.prepare('UPDATE cv_data SET data = ?, updated_at = CURRENT_TIMESTAMP WHERE id = 1')
      .run(JSON.stringify(data));
    res.json({ success: true, message: 'CV data imported' });
  });
  
  app.get('/health', (req, res) => {
    res.json({ status: 'ok', timestamp: new Date().toISOString() });
  });
  
  return app;
}

describe('Integration: Full Stack CV API', () => {
  beforeAll(() => {
    setupTestDB();
    app = createTestApp();
  });
  
  afterAll(() => {
    if (db) {
      db.close();
    }
    if (existsSync(testDbPath)) {
      rmSync(testDbPath);
    }
  });
  
  describe('GET /api/cv', () => {
    it('returns CV data from database', async () => {
      const response = await request(app).get('/api/cv');
      expect(response.status).toBe(200);
      expect(response.body).toHaveProperty('personal');
      expect(response.body.personal.name).toBe('Test User');
    });
    
    it('returns all required CV sections', async () => {
      const response = await request(app).get('/api/cv');
      expect(response.body).toHaveProperty('personal');
      expect(response.body).toHaveProperty('experience');
      expect(response.body).toHaveProperty('skills');
      expect(response.body).toHaveProperty('education');
      expect(response.body).toHaveProperty('projects');
    });
  });
  
  describe('PUT /api/cv', () => {
    it('updates CV data in database', async () => {
      const newData = {
        personal: { name: 'Updated Name', title: 'Senior Dev', email: 'updated@test.com' },
        experience: [{ id: 1, role: 'New Role' }],
        skills: { 'Backend': ['Node.js'] },
        education: [],
        projects: []
      };
      
      const response = await request(app)
        .put('/api/cv')
        .send(newData);
      
      expect(response.status).toBe(200);
      expect(response.body.success).toBe(true);
      
      const verifyResponse = await request(app).get('/api/cv');
      expect(verifyResponse.body.personal.name).toBe('Updated Name');
      expect(verifyResponse.body.experience).toHaveLength(1);
    });
    
    it('validates required fields', async () => {
      const response = await request(app)
        .put('/api/cv')
        .send({ personal: {} });
      
      expect(response.status).toBe(400);
      expect(response.body.error).toContain('name is required');
    });
  });
  
  describe('GET /api/cv/export', () => {
    it('exports CV as JSON file', async () => {
      const response = await request(app).get('/api/cv/export');
      
      expect(response.status).toBe(200);
      expect(response.headers['content-type']).toContain('application/json');
      expect(response.headers['content-disposition']).toContain('cv.json');
      
      const data = JSON.parse(response.text);
      expect(data).toHaveProperty('personal');
    });
  });
  
  describe('POST /api/cv/import', () => {
    it('imports valid CV data', async () => {
      const importData = {
        personal: { name: 'Imported User', title: 'Dev', email: 'import@test.com' },
        experience: [],
        skills: {},
        education: [],
        projects: []
      };
      
      const response = await request(app)
        .post('/api/cv/import')
        .send(importData);
      
      expect(response.status).toBe(200);
      expect(response.body.success).toBe(true);
      
      const verifyResponse = await request(app).get('/api/cv');
      expect(verifyResponse.body.personal.name).toBe('Imported User');
    });
    
    it('rejects invalid CV data', async () => {
      const response = await request(app)
        .post('/api/cv/import')
        .send({ personal: { title: 'No Name' } });
      
      expect(response.status).toBe(400);
    });
  });
  
  describe('GET /health', () => {
    it('returns health status', async () => {
      const response = await request(app).get('/health');
      expect(response.status).toBe(200);
      expect(response.body.status).toBe('ok');
      expect(response.body).toHaveProperty('timestamp');
    });
  });
});