const mongoose = require('mongoose')
const supertest = require('supertest')
const app = require('../app')

const api = supertest(app)

const Blog = require('../models/blog')
const bcrypt = require('bcrypt')
const User = require('../models/user')
const helper = require('./test_helper')

beforeEach(async () => {
  await Blog.deleteMany({})
  await Blog.insertMany(helper.initialBlogs)
})

describe('getting blogs', () => {
  test('blogs are returned as json', async () => {
    await api
      .get('/api/blogs')
      .expect(200)
      .expect('Content-Type', /application\/json/)
  })

  test('all blogs are returned', async () => {
    const response = await api.get('/api/blogs')
    expect(response.body).toHaveLength(helper.initialBlogs.length)
  })

  test('a specific blog is within the returned blogs', async () => {
    const response = await api.get('/api/blogs')
    const contents = response.body.map((r) => r.title)
    expect(contents).toContain('Another blog')
  })
})

describe('adding blog', () => {
  test('a valid blog can be added ', async () => {
    const newBlog = {
      title: 'Test',
      author: 'Tester',
      url: 'http:/test.com',
      likes: 999
    }

    await api
      .post('/api/blogs')
      .send(newBlog)
      .expect(201)
      .expect('Content-Type', /application\/json/)

    const blogsAtEnd = await helper.blogsInDb()
    expect(blogsAtEnd).toHaveLength(helper.initialBlogs.length + 1)
    const contents = blogsAtEnd.map((n) => n.title)
    expect(contents).toContain('Test')
  })

  test('blog without title or url is not added', async () => {
    const newBlog = {
      author: 'Tester',
      likes: 999
    }

    await api.post('/api/blogs').send(newBlog).expect(400)

    const blogsAtEnd = await helper.blogsInDb()
    expect(blogsAtEnd).toHaveLength(helper.initialBlogs.length)
  })

  test('blog without likes is added with 0 likes', async () => {
    const newBlog = {
      title: 'Another test',
      author: 'Tester',
      url: 'http:/test.com'
    }

    await api
      .post('/api/blogs')
      .send(newBlog)
      .expect(201)
      .expect('Content-Type', /application\/json/)

    const blogsAtEnd = await helper.blogsInDb()
    const addedBlog = blogsAtEnd.find(blog => blog.title === 'Another test')
    expect(addedBlog.likes).toBe(0)
  })
})

describe('deleting blog', () => {
  test('a blog can be deleted', async () => {
    const blogsAtStart = await helper.blogsInDb()
    const blogToDelete = blogsAtStart[0]

    await api.delete(`/api/blogs/${blogToDelete.id}`).expect(204)

    const blogsAtEnd = await helper.blogsInDb()
    expect(blogsAtEnd).toHaveLength(helper.initialBlogs.length - 1)
    const contents = blogsAtEnd.map((r) => r.title)
    expect(contents).not.toContain(blogToDelete.title)
  })
})

describe('updating blog', () => {
  test('a blog can be updated', async () => {
    const blogsAtStart = await helper.blogsInDb()
    const blogToUpdate = blogsAtStart[0]

    const newBlog = {
      title: 'Updated blog',
      author: blogToUpdate.author,
      url: blogToUpdate.url,
      likes: blogToUpdate.likes
    }

    await api.put(`/api/blogs/${blogToUpdate.id}`).send(newBlog).expect(200)

    const blogsAtEnd = await helper.blogsInDb()
    expect(blogsAtEnd).toHaveLength(helper.initialBlogs.length)
    const contents = blogsAtEnd.map((r) => r.title)
    expect(contents).toContain('Updated blog')
  })

  test('creation fails with proper statuscode and message if username already taken', async () => {
    const usersAtStart = await helper.usersInDb()

    const newUser = {
      username: 'root',
      name: 'Superuser',
      password: 'salainen',
    }

    const result = await api
      .post('/api/users')
      .send(newUser)
      .expect(400)
      .expect('Content-Type', /application\/json/)

    expect(result.body.error).toContain('expected `username` to be unique')

    const usersAtEnd = await helper.usersInDb()
    expect(usersAtEnd).toEqual(usersAtStart)
  })
})

describe('blog id check', () => {
  test('blog id is defined', async () => {
    const response = await api.get('/api/blogs')
    expect(response.body[0].id).toBeDefined()
  })
})

describe('when there is initially one user in db', () => {
  beforeEach(async () => {
    await User.deleteMany({})

    const passwordHash = await bcrypt.hash('sekret', 10)
    const user = new User({ username: 'root', passwordHash })

    await user.save()
  })

  test('creation succeeds with a fresh username', async () => {
    const usersAtStart = await helper.usersInDb()

    const newUser = {
      username: 'mluukkai',
      name: 'Matti Luukkainen',
      password: 'salainen',
    }

    await api
      .post('/api/users')
      .send(newUser)
      .expect(201)
      .expect('Content-Type', /application\/json/)

    const usersAtEnd = await helper.usersInDb()
    expect(usersAtEnd).toHaveLength(usersAtStart.length + 1)

    const usernames = usersAtEnd.map(u => u.username)
    expect(usernames).toContain(newUser.username)
  })
})

describe('user validation', () => {
  test('username must be at least 3 characters long', async () => {
    const newUser = {
      username: 'ml',
      name: 'Matti Luukkainen',
      password: 'salainen',
    }

    await api.post('/api/users').send(newUser).expect(400)
  })

  test('password must be at least 3 characters long', async () => {
    const newUser = {
      username: 'mluukkai',
      name: 'Matti Luukkainen',
      password: 'sa',
    }

    await api.post('/api/users').send(newUser).expect(400)
  })
})

afterAll(async () => {
  await mongoose.connection.close()
})