import { GraphQLClient } from 'graphql-request'
import { createTestClient } from 'apollo-server-testing'
import Factory from '../../seed/factories'
import { host, login } from '../../jest/helpers'
import { neode, getDriver } from '../../bootstrap/neo4j'
import createServer from '../../server'

const driver = getDriver()
const factory = Factory()
const instance = neode()

let client
let userParams
let authorParams

const postTitle = 'I am a title'
const postContent = 'Some content'
const oldTitle = 'Old title'
const oldContent = 'Old content'
const newTitle = 'New title'
const newContent = 'New content'
const createPostVariables = { title: postTitle, content: postContent }
const createPostWithCategoriesMutation = `
  mutation($title: String!, $content: String!, $categoryIds: [ID]) {
    CreatePost(title: $title, content: $content, categoryIds: $categoryIds) {
      id
      title
    }
  }
`
const createPostWithCategoriesVariables = {
  title: postTitle,
  content: postContent,
  categoryIds: ['cat9', 'cat4', 'cat15'],
}
const postQueryWithCategories = `
  query($id: ID) {
    Post(id: $id) {
      categories {
        id
      }
    }
  }
`
const createPostWithoutCategoriesVariables = {
  title: 'This is a post without categories',
  content: 'I should be able to filter it out',
  categoryIds: null,
}
const postQueryFilteredByCategory = `
query Post($filter: _PostFilter) {
  Post(filter: $filter) {
      title
      id
      categories {
        id
      }
    }
  }
`
const postCategoriesFilterParam = { categories_some: { id_in: ['cat4'] } }
const postQueryFilteredByCategoryVariables = {
  filter: postCategoriesFilterParam,
}

const createPostMutation = `
  mutation($title: String!, $content: String!) {
    CreatePost(title: $title, content: $content) {
      id
      title
      content
      slug
      disabled
      deleted
    }
  }
`
beforeEach(async () => {
  userParams = {
    id: 'u198',
    name: 'TestUser',
    email: 'test@example.org',
    password: '1234',
  }
  authorParams = {
    id: 'u25',
    email: 'author@example.org',
    password: '1234',
  }
  await factory.create('User', userParams)
})

afterEach(async () => {
  await factory.cleanDatabase()
})

describe('CreatePost', () => {
  describe('unauthenticated', () => {
    it('throws authorization error', async () => {
      client = new GraphQLClient(host)
      await expect(client.request(createPostMutation, createPostVariables)).rejects.toThrow(
        'Not Authorised',
      )
    })
  })

  describe('authenticated', () => {
    let headers
    beforeEach(async () => {
      headers = await login(userParams)
      client = new GraphQLClient(host, { headers })
    })

    it('creates a post', async () => {
      const expected = {
        CreatePost: {
          title: postTitle,
          content: postContent,
        },
      }
      await expect(client.request(createPostMutation, createPostVariables)).resolves.toMatchObject(
        expected,
      )
    })

    it('assigns the authenticated user as author', async () => {
      await client.request(createPostMutation, createPostVariables)
      const { User } = await client.request(
        `{
          User(name: "TestUser") {
            contributions {
              title
            }
          }
        }`,
        { headers },
      )
      expect(User).toEqual([{ contributions: [{ title: postTitle }] }])
    })

    describe('disabled and deleted', () => {
      it('initially false', async () => {
        const expected = { CreatePost: { disabled: false, deleted: false } }
        await expect(
          client.request(createPostMutation, createPostVariables),
        ).resolves.toMatchObject(expected)
      })
    })

    describe('language', () => {
      it('allows a user to set the language of the post', async () => {
        const createPostWithLanguageMutation = `
          mutation($title: String!, $content: String!, $language: String) {
            CreatePost(title: $title, content: $content, language: $language) {
              language
            }
          }
        `
        const createPostWithLanguageVariables = {
          title: postTitle,
          content: postContent,
          language: 'en',
        }
        const expected = { CreatePost: { language: 'en' } }
        await expect(
          client.request(createPostWithLanguageMutation, createPostWithLanguageVariables),
        ).resolves.toEqual(expect.objectContaining(expected))
      })
    })

    describe('categories', () => {
      let postWithCategories
      beforeEach(async () => {
        await Promise.all([
          factory.create('Category', {
            id: 'cat9',
            name: 'Democracy & Politics',
            icon: 'university',
          }),
          factory.create('Category', {
            id: 'cat4',
            name: 'Environment & Nature',
            icon: 'tree',
          }),
          factory.create('Category', {
            id: 'cat15',
            name: 'Consumption & Sustainability',
            icon: 'shopping-cart',
          }),
        ])
        postWithCategories = await client.request(
          createPostWithCategoriesMutation,
          createPostWithCategoriesVariables,
        )
      })

      it('allows a user to set the categories of the post', async () => {
        const expected = [{ id: 'cat9' }, { id: 'cat4' }, { id: 'cat15' }]
        const postQueryWithCategoriesVariables = {
          id: postWithCategories.CreatePost.id,
        }

        await expect(
          client.request(postQueryWithCategories, postQueryWithCategoriesVariables),
        ).resolves.toEqual({ Post: [{ categories: expect.arrayContaining(expected) }] })
      })

      it('allows a user to filter for posts by category', async () => {
        await client.request(createPostWithCategoriesMutation, createPostWithoutCategoriesVariables)
        const categoryIds = [{ id: 'cat4' }, { id: 'cat15' }, { id: 'cat9' }]
        const expected = {
          Post: [
            {
              title: postTitle,
              id: postWithCategories.CreatePost.id,
              categories: expect.arrayContaining(categoryIds),
            },
          ],
        }
        await expect(
          client.request(postQueryFilteredByCategory, postQueryFilteredByCategoryVariables),
        ).resolves.toEqual(expected)
      })
    })
  })
})

describe('UpdatePost', () => {
  let updatePostMutation
  let updatePostVariables
  beforeEach(async () => {
    const asAuthor = Factory()
    await asAuthor.create('User', authorParams)
    await asAuthor.authenticateAs(authorParams)
    await asAuthor.create('Post', {
      id: 'p1',
      title: oldTitle,
      content: oldContent,
    })
    updatePostMutation = `
      mutation($id: ID!, $title: String!, $content: String!, $categoryIds: [ID]) {
        UpdatePost(id: $id, title: $title, content: $content, categoryIds: $categoryIds) {
          id
          content
        }
      }
    `

    updatePostVariables = {
      id: 'p1',
      title: newTitle,
      content: newContent,
      categoryIds: null,
    }
  })

  describe('unauthenticated', () => {
    it('throws authorization error', async () => {
      client = new GraphQLClient(host)
      await expect(client.request(updatePostMutation, updatePostVariables)).rejects.toThrow(
        'Not Authorised',
      )
    })
  })

  describe('authenticated but not the author', () => {
    let headers
    beforeEach(async () => {
      headers = await login(userParams)
      client = new GraphQLClient(host, { headers })
    })

    it('throws authorization error', async () => {
      await expect(client.request(updatePostMutation, updatePostVariables)).rejects.toThrow(
        'Not Authorised',
      )
    })
  })

  describe('authenticated as author', () => {
    let headers
    beforeEach(async () => {
      headers = await login(authorParams)
      client = new GraphQLClient(host, { headers })
    })

    it('updates a post', async () => {
      const expected = { UpdatePost: { id: 'p1', content: newContent } }
      await expect(client.request(updatePostMutation, updatePostVariables)).resolves.toEqual(
        expected,
      )
    })

    describe('categories', () => {
      let postWithCategories
      beforeEach(async () => {
        await Promise.all([
          factory.create('Category', {
            id: 'cat9',
            name: 'Democracy & Politics',
            icon: 'university',
          }),
          factory.create('Category', {
            id: 'cat4',
            name: 'Environment & Nature',
            icon: 'tree',
          }),
          factory.create('Category', {
            id: 'cat15',
            name: 'Consumption & Sustainability',
            icon: 'shopping-cart',
          }),
          factory.create('Category', {
            id: 'cat27',
            name: 'Animal Protection',
            icon: 'paw',
          }),
        ])
        postWithCategories = await client.request(
          createPostWithCategoriesMutation,
          createPostWithCategoriesVariables,
        )
        updatePostVariables = {
          id: postWithCategories.CreatePost.id,
          title: newTitle,
          content: newContent,
          categoryIds: ['cat27'],
        }
      })

      it('allows a user to update the categories of a post', async () => {
        await client.request(updatePostMutation, updatePostVariables)
        const expected = [{ id: 'cat27' }]
        const postQueryWithCategoriesVariables = {
          id: postWithCategories.CreatePost.id,
        }
        await expect(
          client.request(postQueryWithCategories, postQueryWithCategoriesVariables),
        ).resolves.toEqual({ Post: [{ categories: expect.arrayContaining(expected) }] })
      })
    })
  })
})

describe('DeletePost', () => {
  const mutation = `
    mutation($id: ID!) {
      DeletePost(id: $id) {
        id
        content
      }
    }
  `

  const variables = {
    id: 'p1',
  }

  beforeEach(async () => {
    const asAuthor = Factory()
    await asAuthor.create('User', authorParams)
    await asAuthor.authenticateAs(authorParams)
    await asAuthor.create('Post', {
      id: 'p1',
      content: 'To be deleted',
    })
  })

  describe('unauthenticated', () => {
    it('throws authorization error', async () => {
      client = new GraphQLClient(host)
      await expect(client.request(mutation, variables)).rejects.toThrow('Not Authorised')
    })
  })

  describe('authenticated but not the author', () => {
    let headers
    beforeEach(async () => {
      headers = await login(userParams)
      client = new GraphQLClient(host, { headers })
    })

    it('throws authorization error', async () => {
      await expect(client.request(mutation, variables)).rejects.toThrow('Not Authorised')
    })
  })

  describe('authenticated as author', () => {
    let headers
    beforeEach(async () => {
      headers = await login(authorParams)
      client = new GraphQLClient(host, { headers })
    })

    it('deletes a post', async () => {
      const expected = { DeletePost: { id: 'p1', content: 'To be deleted' } }
      await expect(client.request(mutation, variables)).resolves.toEqual(expected)
    })
  })
})

describe('emotions', () => {
  let addPostEmotionsVariables,
    someUser,
    ownerNode,
    owner,
    postMutationAction,
    user,
    postQueryAction
  const postEmotionsCountQuery = `
    query($id: ID!) {
      Post(id: $id) {
        emotionsCount
      }
    }
  `
  const postEmotionsQuery = `
  query($id: ID!) {
    Post(id: $id) {
      emotions {
        emotion
        User {
          id
        }
      }
    }
  }
`
  beforeEach(async () => {
    userParams.id = 'u1987'
    authorParams.id = 'u257'
    const someUserNode = await instance.create('User', userParams)
    someUser = await someUserNode.toJson()
    ownerNode = await instance.create('User', authorParams)
    owner = await ownerNode.toJson()

    postMutationAction = async (user, mutation, variables) => {
      const { server } = createServer({
        context: () => {
          return {
            user,
            driver,
          }
        },
      })
      const { mutate } = createTestClient(server)

      return mutate({
        mutation,
        variables,
      })
    }
    postQueryAction = async (postQuery, variables) => {
      const { server } = createServer({
        context: () => {
          return {
            user,
            driver,
          }
        },
      })
      const { query } = createTestClient(server)
      return query({ query: postQuery, variables })
    }
  })

  describe('AddPostEmotions', () => {
    let postEmotionsQueryVariables
    beforeEach(async () => {
      user = owner
      const {
        data: { CreatePost },
      } = await postMutationAction(user, createPostMutation, createPostVariables)
      addPostEmotionsVariables = {
        from: { id: authorParams.id },
        to: { id: CreatePost.id },
        data: { emotion: 'happy' },
      }
      postEmotionsQueryVariables = { id: CreatePost.id }
    })

    const addPostEmotionsMutation = `
      mutation($from: _UserInput!, $to: _PostInput!, $data: _EMOTEDInput!) {
        AddPostEmotions(from: $from, to: $to, data: $data) {
          from { id }
          to { id }
          emotion
        }
      }
    `
    describe('unauthenticated', () => {
      it('throws authorization error', async () => {
        user = null
        const result = await postMutationAction(
          user,
          addPostEmotionsMutation,
          addPostEmotionsVariables,
        )

        expect(result.errors[0]).toHaveProperty('message', 'Not Authorised!')
      })
    })

    describe('authenticated and not the author', () => {
      beforeEach(() => {
        user = someUser
      })

      it('adds an emotion to the post', async () => {
        addPostEmotionsVariables.from.id = userParams.id
        const expected = {
          data: {
            AddPostEmotions: {
              from: addPostEmotionsVariables.from,
              to: addPostEmotionsVariables.to,
              emotion: 'happy',
            },
          },
        }
        await expect(
          postMutationAction(user, addPostEmotionsMutation, addPostEmotionsVariables),
        ).resolves.toEqual(expect.objectContaining(expected))
      })

      it('limits the addition of the same emotion to 1', async () => {
        const expected = {
          data: {
            Post: [
              {
                emotionsCount: 1,
              },
            ],
          },
        }
        await postMutationAction(user, addPostEmotionsMutation, addPostEmotionsVariables)
        await postMutationAction(user, addPostEmotionsMutation, addPostEmotionsVariables)
        await expect(
          postQueryAction(postEmotionsCountQuery, postEmotionsQueryVariables),
        ).resolves.toEqual(expect.objectContaining(expected))
      })

      it('allows a user to add more than one emotion', async () => {
        const expectedEmotions = [
          { emotion: 'happy', User: { id: authorParams.id } },
          { emotion: 'surprised', User: { id: authorParams.id } },
        ]
        const expectedResponse = {
          data: { Post: [{ emotions: expect.arrayContaining(expectedEmotions) }] },
        }
        await postMutationAction(user, addPostEmotionsMutation, addPostEmotionsVariables)
        addPostEmotionsVariables.data.emotion = 'surprised'
        await postMutationAction(user, addPostEmotionsMutation, addPostEmotionsVariables)
        await expect(
          postQueryAction(postEmotionsQuery, postEmotionsQueryVariables),
        ).resolves.toEqual(expect.objectContaining(expectedResponse))
      })
    })

    describe('authenticated as author', () => {
      beforeEach(() => {
        user = owner
      })

      it('adds an emotion to the post', async () => {
        const expected = {
          data: {
            AddPostEmotions: {
              from: addPostEmotionsVariables.from,
              to: addPostEmotionsVariables.to,
              emotion: 'happy',
            },
          },
        }
        await expect(
          postMutationAction(user, addPostEmotionsMutation, addPostEmotionsVariables),
        ).resolves.toEqual(expect.objectContaining(expected))
      })
    })
  })

  describe('RemovePostEmotions', () => {
    let removePostEmotionsVariables, postEmotionsQueryVariables
    const removePostEmotionsMutation = `
      mutation($from: _UserInput!, $to: _PostInput!, $data: _EMOTEDInput!) {
        RemovePostEmotions(from: $from, to: $to, data: $data)
      }
    `
    beforeEach(() => {
      removePostEmotionsVariables = {
        from: { id: authorParams.id },
        to: { id: 'p1376' },
        data: { emotion: 'cry' },
      }
    })

    describe('unauthenticated', () => {
      it('throws authorization error', async () => {
        user = null
        const result = await postMutationAction(
          user,
          removePostEmotionsMutation,
          removePostEmotionsVariables,
        )

        expect(result.errors[0]).toHaveProperty('message', 'Not Authorised!')
      })
    })

    describe('authenticated', () => {
      beforeEach(async () => {
        user = owner
        const {
          data: { CreatePost },
        } = await postMutationAction(user, createPostMutation, createPostVariables)
        await factory.emote({
          from: authorParams.id,
          to: CreatePost.id,
          data: 'cry',
        })
        await factory.emote({
          from: authorParams.id,
          to: CreatePost.id,
          data: 'happy',
        })
        postEmotionsQueryVariables = { id: CreatePost.id }
      })

      describe('but not the emoter', () => {
        it('throws an authorization error', async () => {
          user = someUser
          const result = await postMutationAction(
            user,
            removePostEmotionsMutation,
            removePostEmotionsVariables,
          )

          expect(result.errors[0]).toHaveProperty('message', 'Not Authorised!')
        })
      })

      describe('as the emoter', () => {
        it('removes an emotion from a post', async () => {
          user = owner
          const expected = { data: { RemovePostEmotions: true } }
          await expect(
            postMutationAction(user, removePostEmotionsMutation, removePostEmotionsVariables),
          ).resolves.toEqual(expect.objectContaining(expected))
        })

        it('removes only the requested emotion, not all emotions', async () => {
          const expectedEmotions = [{ emotion: 'happy', User: { id: authorParams.id } }]
          const expectedResponse = {
            data: { Post: [{ emotions: expect.arrayContaining(expectedEmotions) }] },
          }
          await postMutationAction(user, removePostEmotionsMutation, removePostEmotionsVariables)
          await expect(
            postQueryAction(postEmotionsQuery, postEmotionsQueryVariables),
          ).resolves.toEqual(expect.objectContaining(expectedResponse))
        })
      })
    })
  })

  describe('posts emotions count', () => {
    let postsEmotionsCountByEmotionVariables
    let postsEmotionsCountByCurrentUserVariables

    const postsEmotionsCountByEmotionQuery = `
      query($postId: ID!, $data: _EMOTEDInput!) {
        postsEmotionsCountByEmotion(postId: $postId, data: $data) 
      }
      `

    const postsEmotionsCountByCurrentUserQuery = `
      query($postId: ID!) {
        postsEmotionsCountByCurrentUser(postId: $postId)
      }
    `
    beforeEach(async () => {
      user = owner
      const {
        data: { CreatePost },
      } = await postMutationAction(user, createPostMutation, createPostVariables)
      await factory.emote({
        from: authorParams.id,
        to: CreatePost.id,
        data: 'cry',
      })
      postsEmotionsCountByEmotionVariables = {
        postId: CreatePost.id,
        data: { emotion: 'cry' },
      }
      postsEmotionsCountByCurrentUserVariables = { postId: CreatePost.id }
    })

    describe('postsEmotionsCountByEmotion', () => {
      it("returns a post's emotions count", async () => {
        const expectedResponse = { data: { postsEmotionsCountByEmotion: 1 } }
        await expect(
          postQueryAction(postsEmotionsCountByEmotionQuery, postsEmotionsCountByEmotionVariables),
        ).resolves.toEqual(expect.objectContaining(expectedResponse))
      })
    })

    describe('postsEmotionsCountByEmotion', () => {
      it("returns a currentUser's emotions on a post", async () => {
        const expectedResponse = { data: { postsEmotionsCountByCurrentUser: ['cry'] } }
        await expect(
          postQueryAction(
            postsEmotionsCountByCurrentUserQuery,
            postsEmotionsCountByCurrentUserVariables,
          ),
        ).resolves.toEqual(expect.objectContaining(expectedResponse))
      })
    })
  })
})