{-# LANGUAGE QuasiQuotes #-}
{-# LANGUAGE RecordWildCards #-}

-- | Testing nested relationships.
--
-- Original inspiration for this module is <https://github.com/hasura/graphql-engine-mono/blob/08caf7df10cad0aea0916327736147a0a8f808d1/server/tests-py/queries/graphql_query/mysql/nested_select_query_deep.yaml>
module NestedRelationshipsSpec (spec) where

import Harness.Constants
import Harness.Feature qualified as Feature
import Harness.Graphql
import Harness.GraphqlEngine qualified as GraphqlEngine
import Harness.Mysql as Mysql
import Harness.Sql
import Harness.State (State)
import Harness.Yaml
import Test.Hspec
import Prelude

--------------------------------------------------------------------------------
-- Preamble

spec :: SpecWith State
spec =
  Feature.feature
    Feature.Feature
      { Feature.backends =
          [ Feature.Backend
              { name = "MySQL",
                setup = mysqlSetup,
                teardown = mysqlTeardown
              }
          ],
        Feature.tests = tests
      }

--------------------------------------------------------------------------------
-- MySQL backend

mysqlSetup :: State -> IO ()
mysqlSetup state = do
  -- Clear and reconfigure the metadata
  GraphqlEngine.post_
    state
    "/v1/metadata"
    [yaml|
type: replace_metadata
args:
  version: 3
  sources:
  - name: mysql
    kind: mysql
    tables: []
    configuration:
      database: *mysqlDatabase
      user: *mysqlUser
      password: *mysqlPassword
      host: *mysqlHost
      port: *mysqlPort
      pool_settings: {}
|]

  -- Setup tables
  Mysql.run_
    [sql|
CREATE TABLE author
(
    id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(45) UNIQUE KEY,
    createdAt DATETIME
);
|]
  Mysql.run_
    [sql|
INSERT INTO author
    (name, createdAt)
VALUES
    ( 'Author 1', '2017-09-21 09:39:44' ),
    ( 'Author 2', '2017-09-21 09:50:44' );
|]

  -- Setup tables
  Mysql.run_
    [sql|
CREATE TABLE article (
    id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
    title TEXT,
    content TEXT,
    is_published BIT,
    published_on TIMESTAMP,
    author_id INT UNSIGNED,
    co_author_id INT UNSIGNED,
    FOREIGN KEY (author_id) REFERENCES author(id),
    FOREIGN KEY (co_author_id) REFERENCES author(id)
);
|]
  Mysql.run_
    [sql|
INSERT INTO article
    (title, content, author_id, is_published)
VALUES
    ( 'Article 1', 'Sample article content 1', 1, 0 ),
    ( 'Article 2', 'Sample article content 2', 1, 1 ),
    ( 'Article 3', 'Sample article content 3', 2, 1 );
|]

  -- Track the tables
  GraphqlEngine.post_
    state
    "/v1/metadata"
    [yaml|
type: mysql_track_table
args:
  source: mysql
  table:
    schema: hasura
    name: author
|]
  GraphqlEngine.post_
    state
    "/v1/metadata"
    [yaml|
type: mysql_track_table
args:
  source: mysql
  table:
    schema: hasura
    name: article
|]

  -- Setup relationships
  GraphqlEngine.post_
    state
    "/v1/metadata"
    [yaml|
type: mysql_create_object_relationship
args:
  source: mysql
  table:
    name: article
    schema: hasura
  name: author
  using:
    foreign_key_constraint_on: author_id
|]
  GraphqlEngine.post_
    state
    "/v1/metadata"
    [yaml|
type: mysql_create_array_relationship
args:
  source: mysql
  table:
    name: author
    schema: hasura
  name: articles
  using:
    foreign_key_constraint_on:
      table:
        name: article
        schema: hasura
      column: author_id
|]

mysqlTeardown :: State -> IO ()
mysqlTeardown _ = do
  Mysql.run_
    [sql|
DROP TABLE article;
|]
  Mysql.run_
    [sql|
DROP TABLE author;
|]

--------------------------------------------------------------------------------
-- Tests

tests :: SpecWith State
tests = do
  it "Nested select on article" $ \state ->
    shouldReturnYaml
      ( GraphqlEngine.postGraphql
          state
          [graphql|
query {
  hasura_article(where: {id: {_eq: 1}}) {
    id
    author {
      id
      articles(where: {id: {_eq: 1}}) {
        id
        author {
          id
          articles(where: {id: {_eq: 1}}) {
            id
            author {
              id
            }
          }
        }
      }
    }
  }
}
|]
      )
      [yaml|
  data:
    hasura_article:
    - id: 1
      author:
        id: 1
        articles:
        - id: 1
          author:
            id: 1
            articles:
            - id: 1
              author:
                id: 1
|]