import os
import textwrap
from abc import ABC, abstractmethod

class Fixtures():
  setups = {} # Map backend [Setup]
  specs = {} # Map desc [Spec]

  def add_setup(self, backend, setup):
    if not backend in self.setups.keys():
      self.setups[backend] = []
    self.setups[backend].append(setup)

  def add_spec(self, desc, spec):
    if not desc in self.specs.keys():
      self.specs[desc] = []
    self.specs[desc].append(spec)

def render_gql(query):
  return f"""GraphqlEngine.postGraphql
  testEnvironment
  [graphql|
{textwrap.indent(query, '    ')}
  |]"""

def render_v2query(expected_status, query):
  return f"""GraphqlEngine.postV2Query
  {expected_status}
  testEnvironment
  [interpolateYaml|
{textwrap.indent(query, '    ')}
  |]"""

class Setup():
  def __init__(self, setup_name, original_file, url, value):
    self.setup_name = setup_name
    self.original_file = original_file
    self.url = url
    self.value = value

  def render_define(self, backend):
    return f"""-- original file: {self.original_file}
{self.setup_name}_{backend} :: Yaml.Value
{self.setup_name}_{backend} =
  [interpolateYaml|
{textwrap.indent(self.value, 4*' ')}
  |]
"""

  def render_run(self, backend):
    res = ""
    if self.url == "/v2/query":
      res = f"GraphqlEngine.postV2Query 200 testEnvironment {self.setup_name}_{backend}"
    elif self.url == "/v1/graphql":
      res = f"GraphqlEngine.postGraphql testEnvironment {self.setup_name}_{backend}"
    elif self.url == "/v1/metadata":
      res = f"""GraphqlEngine.postMetadata_ testEnvironment {self.setup_name}_{backend}"""

    else:
      raise f"Unknown query url: {self.url}"
    
    return res

class Spec(ABC):

  @abstractmethod
  def render(self):
    pass
  
class CovertSetupSpec(Spec):
  """
  Specs that do not make any assertions, i.e. are only run for their side
  effects.
  """
  def __init__(self, desc, file, url, query):
    self.desc = desc
    self.file = file
    self.url = url
    self.query = query

  def render(self):
    res = ""
    if self.url == "/v2/query":
      res = render_v2query(200, self.query)
    elif self.url == "/v1/graphql":
      res = render_gql(self.query)
    else:
      raise f"Unknown query url: {self.url}"

    res = "void $ " + res

    return f"""-- from: {self.file}
it "{self.desc}" \\testEnvironment -> do
{textwrap.indent(res, ' ')}"""

class PostSpec(Spec):
  """
  Specs that post something to HGE and make assertions against status code and
  response.
  """
  def __init__(self, desc, file, url, query, expected_status, expected_response):
    self.desc = desc
    self.file = file
    self.url = url
    self.query = query
    self.expected_status = expected_status
    self.expected_response = expected_response

  def render(self):
    actual = ""
    if self.url == "/v2/query":
      actual = render_v2query(self.expected_status, self.query)
    elif self.url == "/v1/graphql":
      actual = render_gql(self.query)
    else:
      raise f"Unknown query url: {self.url}"

    return f"""-- from: {self.file}
it "{self.desc}" \\testEnvironment -> do
  let expected :: Yaml.Value
      expected =
        [interpolateYaml|
{textwrap.indent(self.expected_response, '          ')}
        |]
   
      actual :: IO Yaml.Value
      actual =
{textwrap.indent(actual, '        ')}

  actual `shouldBe` expected"""


tests_to_port = {} # Map classname Fixtures

def with_test(name):

  if not name in tests_to_port.keys():
    tests_to_port[name] = Fixtures()

  return tests_to_port[name]


def write_tests_to_port():
  global tests_to_port

  os.makedirs("../lib/api-tests/src/Test/PortedFromPytest", exist_ok=True)

  for name, fixtures in tests_to_port.items():
    backends = fixtures.setups.keys()
    # Rather than directly make a hspec-discover'ed spec we include ported specs manually
    # for now.
    # This enables us to bulk-update the ported specs if we make changes to this porting script.
    #hspecified_name = name.removeprefix("Test") + "Spec"

    hspecified_name = name
    with open(f"../lib/api-tests/src/Test/PortedFromPytest/{hspecified_name}.hs", 'w') as ported_hs:
        ported_hs.write("{-# OPTIONS_GHC -Wno-deprecations #-}\n")
        ported_hs.write(f"""\
-- | GENERATED BY 'server/tests-py/PortToHaskell.py'.
-- Please avoid editing this file manually.
module Test.PortedFromPytest.{hspecified_name} (spec) where

import Data.Aeson qualified as Yaml
import Data.List.NonEmpty qualified as NE
""" + str.join('\n', [
        f"import Harness.Backend.{backend} qualified as {backend}"
           for backend in backends

        ]) +  
"""
import Harness.GraphqlEngine qualified as GraphqlEngine
import Harness.PytestPortedCompat (compatSetup)
import Harness.Quoter.Graphql (graphql)
import Harness.Quoter.Yaml
import Harness.Test.Fixture qualified as Fixture
import Harness.TestEnvironment (TestEnvironment (..))
import Harness.Yaml (shouldReturnYaml)
import Hasura.Prelude
import Test.Hspec

"""
        )

        for backend, setup_values in fixtures.setups.items():
          for setup in setup_values:
            ported_hs.write(setup.render_define(backend) + '\n')

          ported_hs.write(
        f"""
fixture_{backend} :: Fixture.Fixture ()
fixture_{backend} =
  (Fixture.fixture $ Fixture.Backend Fixture.{backend})""" +
  """
    { Fixture.setupTeardown = \\(testEnvironment, _) ->
        [ Fixture.SetupAction
            { Fixture.setupAction = do""" + f"""
                compatSetup testEnvironment Fixture.{backend}
""" + textwrap.indent(str.join('\n', map(lambda setup: setup.render_run(backend), setup_values)), 16*' ') + """,
              Fixture.teardownAction = \\_ -> return ()
            }
        ]
    }
""")

        ported_hs.write("""
spec :: SpecWith TestEnvironment
spec = Fixture.runSingleSetup (NE.fromList [""" + str.join(', ', ["fixture_" + backend for backend in backends]) + """]) tests

tests :: Fixture.Options -> SpecWith TestEnvironment
tests opts = do
  let shouldBe :: IO Yaml.Value -> Yaml.Value -> IO ()
      shouldBe = shouldReturnYaml opts
""")

        for desc, specs in fixtures.specs.items():
          ported_hs.write(f"""
  describe "{desc}" do
""")
          for spec in specs:
              ported_hs.write('\n' + textwrap.indent(spec.render(), 4*' ') + '\n')

  tests_to_port = {}