{-# LANGUAGE OverloadedLabels #-}
{-# LANGUAGE OverloadedLists #-}
{-# LANGUAGE QuasiQuotes #-}

module EntitySpec where

import Control.Monad (void)
import Control.Monad.IO.Class
import Data.Text (Text)
import qualified Data.UUID as UUID
import qualified Data.Vector as V
import Database.PostgreSQL.Simple (Connection, Only (Only))
import Database.PostgreSQL.Simple.Migration (MigrationCommand (MigrationDirectory, MigrationInitialization),
                                             runMigrations)
import Database.PostgreSQL.Transact (DBT)
import Test.Hspec (Spec)
import Test.Hspec.DB (describeDB, itDB)
import Test.Hspec.Expectations.Lifted (shouldBe, shouldMatchList, shouldReturn)

import Database.PostgreSQL.Entity (_joinSelectWithFields, delete, deleteByField, selectById, selectManyByField,
                                   selectOneByField, selectWhereNotNull, selectWhereNull, update, updateFieldsBy)
import Database.PostgreSQL.Entity.DBT (QueryNature (..), query_)
import Database.PostgreSQL.Entity.Internal.BlogPost (Author (..), AuthorId (..), BlogPost (..), BlogPostId (BlogPostId),
                                                     insertAuthor, insertBlogPost)
import Database.PostgreSQL.Entity.Internal.QQ (field)

author1 :: Author
author1 =
  let authorId = AuthorId (read "74c3fa0e-79e4-11eb-8792-5405db82c3cd")
      name = "Jamie Reynolds"
      createdAt = read "2021-02-28 17:30:13 UTC"
   in Author{..}

author2 :: Author
author2 =
  let authorId = AuthorId (read "bc97c16c-7b83-11eb-83e5-5405db82c3cd")
      name = "Hansi Kürsch"
      createdAt = read "2021-02-28 17:30:17 UTC"
   in Author{..}

author3 :: Author
author3 =
  let authorId = AuthorId (read "3aa9232e-7f6d-11eb-823f-5405db82c3cd")
      name = "Johnson McElroy"
      createdAt = read "2021-02-28 17:31:39 UTC"
   in Author{..}

blogPost1 :: BlogPost
blogPost1 =
  let blogPostId = BlogPostId (read "55b3821a-79e4-11eb-ad18-5405db82c3cd")
      authorId   = #authorId author1
      uuidList   = [read "4401d848-7b40-11eb-b148-5405db82c3cd", read "4bbf0786-7b40-11eb-b1d9-5405db82c3cd"]
      title      = "Echoes from the other world"
      content    = "Send out a sound\nFor the wood between the worlds\nGently repeat\nAs the boundaries start to swirl"
      createdAt  = read "2021-02-28 17:48:15 UTC"
  in BlogPost{..}

blogPost2 :: BlogPost
blogPost2 =
  let blogPostId = BlogPostId (read "a8df9980-79fb-11eb-a061-5405db82c3cd")
      authorId   = #authorId author2
      uuidList   = [read "4401d848-7b40-11eb-b148-5405db82c3cd", read "4bbf0786-7b40-11eb-b1d9-5405db82c3cd"]
      title      = "A Past and Future Secret"
      content    = "Oh, I haven't been here for a while\nIn blindness and decay\nThe circle's been closed, now"
      createdAt  = read "2021-02-28 20:33:25 UTC"
  in BlogPost{..}

blogPost3 :: BlogPost
blogPost3 =
  let blogPostId = BlogPostId (read "1a032938-79fc-11eb-b1ec-5405db82c3cd")
      authorId   = #authorId author2
      uuidList   = [read "4401d848-7b40-11eb-b148-5405db82c3cd", read "4bbf0786-7b40-11eb-b1d9-5405db82c3cd"]
      title      = "The Script for my requiem"
      content    = "[…]"
      createdAt  = read "2021-02-28 21:23:25 UTC"
  in BlogPost{..}

blogPost4 :: BlogPost
blogPost4 =
  let blogPostId = BlogPostId (read "1e1e6dac-79fc-11eb-b6a6-5405db82c3cd")
      authorId   = #authorId author2
      uuidList   = [read "4401d848-7b40-11eb-b148-5405db82c3cd", read "4bbf0786-7b40-11eb-b1d9-5405db82c3cd"]
      title      = "Mordred's Song"
      content    = "[…]"
      createdAt  = read "2021-02-28 21:24:35 UTC"
  in BlogPost{..}


migrate :: Connection -> IO ()
migrate conn = void $ runMigrations False conn [MigrationInitialization, MigrationDirectory "./test/migrations"]

spec :: Spec
spec = describeDB migrate "Entity DB " $ do
  itDB "Insert authors" $ do
    insertAuthor author1
    insertAuthor author2
    insertAuthor author3
  itDB "Insert blog posts" $ do
    insertBlogPost blogPost1
    insertBlogPost blogPost2
    insertBlogPost blogPost3
    insertBlogPost blogPost4
    result <- selectById $ Only (#blogPostId blogPost1)
    result `shouldBe` Just blogPost1
  itDB "Select blog post by title" $ do
    selectOneByField @BlogPost [field| title |] (Only ("A Past and Future Secret" :: Text))
      `shouldReturn` Just blogPost2
  itDB "Select all blog posts by non-null condition" $ do
    result <- selectWhereNotNull @BlogPost [[field| author_id |], [field| title |]]
    V.toList result `shouldMatchList` [blogPost1, blogPost2, blogPost3, blogPost4]
  itDB "Select no blog post by null condition" $ do
    result <- selectWhereNull @BlogPost [[field| author_id |], [field| content |]]
    V.length result `shouldBe` 0
  itDB "Select multiple blog posts by author id" $ do
    result <- selectManyByField @BlogPost [field| author_id |] $ Only (#authorId blogPost4)
    V.toList result `shouldMatchList` [blogPost2, blogPost3, blogPost4]
  itDB "Delete a blog post" $ do
    delete @BlogPost (Only (blogPostId blogPost2))
    result <- selectManyByField @BlogPost [field| blogpost_id |] $ Only (#blogPostId blogPost2)
    V.length result `shouldBe` 0
  itDB "Delete a blog post by title" $ do
    deleteByField @BlogPost [[field| title |]] (Only @Text "Echoes from the other world")
    result <- selectManyByField @BlogPost [field| title |] $ Only (#title blogPost1)
    V.length result `shouldBe` 0
  itDB "Get all the article titles by author name" $ do
    let q = _joinSelectWithFields @BlogPost @Author [[field| title |]] [[field| name |]]
    (query_ Select q :: (MonadIO m) => DBT m (V.Vector (Text, Text)))
      `shouldReturn` [("The Script for my requiem","Hansi Kürsch"),("Mordred's Song","Hansi Kürsch")]
  itDB "Change the name of an author" $ do
    let newAuthor = author2{name = "Hannah Kürsch"}
    update @Author newAuthor
    selectById (Only (#authorId author2))
      `shouldReturn` Just newAuthor
  itDB "Change the name of an author according to their name" $ do
    let newName = "Tiberus McElroy" :: Text
    let oldName = "Johnson McElroy" :: Text
    updateFieldsBy @Author [[field| name |]] ([field| name |], oldName) (Only newName)
     `shouldReturn` 1
  itDB "Change the author and title of a blogpost" $ do
    let newAuthorId =  UUID.toText $ getAuthorId $ #authorId author3 :: Text
    let newTitle    = "Something Entirely New" :: Text
    modifiedRows <- updateFieldsBy @BlogPost [[field| author_id |], [field| title |]] ([field| title |], #title blogPost4) (newAuthorId, newTitle)
    result <- selectManyByField @BlogPost [field| author_id |] (Only (#authorId author3))
    V.length result `shouldBe` fromIntegral modifiedRows