from hitchstory import StoryCollection, BaseEngine, exceptions, validate, no_stacktrace_for
from hitchstory import GivenDefinition, GivenProperty, InfoDefinition, InfoProperty
from templex import Templex
from strictyaml import Optional, Str, Map, Int, Bool, Enum, load
from path import Path
import hitchpylibrarytoolkit
from hitchrunpy import (
    ExamplePythonCode,
    HitchRunPyException,
    ExpectedExceptionMessageWasDifferent,
)



CODE_TYPE = Map({"in python 2": Str(), "in python 3": Str()}) | Str()


class Engine(BaseEngine):
    """Python engine for running tests."""

    given_definition = GivenDefinition(
        yaml_snippet=GivenProperty(
            Str(),
            document="yaml_snippet:\n```yaml\n{{ yaml_snippet }}\n```"
        ),
        yaml_snippet_1=GivenProperty(
            Str(),
            document="yaml_snippet_1:\n```yaml\n{{ yaml_snippet_1 }}\n```"
        ),
        yaml_snippet_2=GivenProperty(
            Str(),
            document="yaml_snippet_2:\n```yaml\n{{ yaml_snippet_2 }}\n```"
        ),
        modified_yaml_snippet=GivenProperty(
            Str(),
            document="modified_yaml_snippet:\n```yaml\n{{ modified_yaml_snippet }}\n```"
        ),
        python_version=GivenProperty(Str()),
        ruamel_version=GivenProperty(Str()),
        setup=GivenProperty(
            Str(),
            document="```python\n{{ setup }}\n```"
        ),
    )

    info_definition = InfoDefinition(
        status=InfoProperty(schema=Enum(["experimental", "stable"])),
        docs=InfoProperty(schema=Str()),
        fails_on_python_2=InfoProperty(schema=Bool()),
        description=InfoProperty(schema=Str()),
        experimental=InfoProperty(schema=Bool()),
    )

    def __init__(self, keypath, python_path=None, rewrite=False, cprofile=False):
        self.path = keypath
        self._python_path = python_path
        self._rewrite = rewrite
        self._cprofile = cprofile

    def set_up(self):
        """Set up your applications and the test environment."""
        self.path.profile = self.path.gen.joinpath("profile")

        if not self.path.profile.exists():
            self.path.profile.mkdir()

        if not self._python_path:
            self.pylibrary = hitchpylibrarytoolkit.PyLibraryBuild(
                "strictyaml",
                self.path
            ).with_python_version(self.given["python version"])\
             .with_packages({"ruamel.yaml": self.given["ruamel version"]})
            self.pylibrary.ensure_built()
            self.python = self.pylibrary.bin.python
        else:
            self.python = Path(self._python_path)
            assert self.python.exists()

        self.example_py_code = (
            ExamplePythonCode(self.python, self.path.gen)
            .with_code(self.given.get("code", ""))
            .with_setup_code(
                self.given.get("setup", "")
            )
            .with_terminal_size(160, 100)
            .with_strings(
                yaml_snippet_1=self.given.get("yaml_snippet_1"),
                yaml_snippet=self.given.get("yaml_snippet"),
                yaml_snippet_2=self.given.get("yaml_snippet_2"),
                modified_yaml_snippet=self.given.get("modified_yaml_snippet"),
            )
        )

    @no_stacktrace_for(AssertionError)
    @no_stacktrace_for(HitchRunPyException)
    @validate(
        code=Str(),
        will_output=Map({"in python 2": Str(), "in python 3": Str()}) | Str(),
        raises=Map({Optional("type"): CODE_TYPE, Optional("message"): CODE_TYPE}),
        in_interpreter=Bool(),
    )
    def run(
        self,
        code,
        will_output=None,
        yaml_output=True,
        raises=None,
        in_interpreter=False,
    ):
        if in_interpreter:
            if self.given["python version"].startswith("3"):
                code = "{0}\nprint(repr({1}))".format(
                    "\n".join(code.strip().split("\n")[:-1]), code.strip().split("\n")[-1]
                )
            else:
                code = "{0}\nprint repr({1})".format(
                    "\n".join(code.strip().split("\n")[:-1]), code.strip().split("\n")[-1]
                )

        to_run = self.example_py_code.with_code(code)

        if self._cprofile:
            to_run = to_run.with_cprofile(
                self.path.profile.joinpath("{0}.dat".format(self.story.slug))
            )

        if raises is None:
            result = (
                to_run.expect_exceptions().run() if raises is not None else to_run.run()
            )

            if will_output is not None:
                actual_output = "\n".join(
                    [line.rstrip() for line in result.output.split("\n")]
                )
                try:
                    Templex(will_output).assert_match(actual_output)
                except AssertionError:
                    if self._rewrite:
                        self.current_step.update(**{"will output": actual_output})
                    else:
                        raise

        elif raises is not None:
            differential = False  # Difference between Python 2 and Python 3 output?
            exception_type = raises.get("type")
            message = raises.get("message")

            if exception_type is not None:
                if not isinstance(exception_type, str):
                    differential = True
                    exception_type = (
                        exception_type["in python 2"]
                        if self.given["python version"].startswith("2")
                        else exception_type["in python 3"]
                    )

            if message is not None:
                if not isinstance(message, str):
                    differential = True
                    message = (
                        message["in python 2"]
                        if self.given["python version"].startswith("2")
                        else message["in python 3"]
                    )

            try:
                result = to_run.expect_exceptions().run()
                result.exception_was_raised(exception_type, message)
            except ExpectedExceptionMessageWasDifferent as error:
                if self._rewrite and not differential:
                    new_raises = raises.copy()
                    new_raises["message"] = result.exception.message
                    self.current_step.update(raises=new_raises)
                else:
                    raise

    def pause(self, message="Pause"):
        import IPython

        IPython.embed()

    def on_success(self):
        if self._rewrite:
            self.new_story.save()
        if self._cprofile:
            self.python(
                self.path.key.joinpath("printstats.py"),
                self.path.profile.joinpath("{0}.dat".format(self.story.slug)),
            ).run()