import os
import sys
import types
import typing as tp
from unittest.mock import MagicMock

import pytest

from xonsh.aliases import Aliases
from xonsh.built_ins import XonshSession, XSH
from xonsh.completer import Completer
from xonsh.execer import Execer
from xonsh.jobs import tasks
from xonsh.events import events
from xonsh.parsers.completion_context import CompletionContextParser

from xonsh import commands_cache
from tools import DummyShell, sp, DummyHistory, copy_env


@pytest.fixture
def source_path():
    """Get the xonsh source path."""
    pwd = os.path.dirname(__file__)
    return os.path.dirname(pwd)


@pytest.fixture
def xonsh_execer(monkeypatch, xonsh_session):
    """Initiate the Execer with a mocked nop `load_builtins`"""
    yield xonsh_session.execer


@pytest.fixture
def xonsh_execer_exec(xonsh_execer):
    def factory(input, **kwargs):
        xonsh_execer.exec(input, **kwargs)
        return True

    return factory


@pytest.fixture
def xonsh_execer_parse(xonsh_execer):
    def factory(input):
        tree = XSH.execer.parse(input, ctx=None)
        return tree

    return factory


@pytest.fixture
def patch_commands_cache_bins(xession, tmp_path, monkeypatch):
    def _factory(binaries: tp.List[str]):
        xession.env["PATH"] = [tmp_path]
        exec_mock = MagicMock(return_value=binaries)
        monkeypatch.setattr(commands_cache, "executables_in", exec_mock)
        return xession.commands_cache

    return _factory


@pytest.fixture
def patch_locate_binary(monkeypatch):
    def locate_binary(self, name):
        return os.path.join(os.path.dirname(__file__), "bin", name)

    def factory(cc: commands_cache.CommandsCache):
        monkeypatch.setattr(cc, "locate_binary", types.MethodType(locate_binary, cc))
        return cc

    return factory


@pytest.fixture
def monkeypatch_stderr(monkeypatch):
    """Monkeypath sys.stderr with no ResourceWarning."""
    with open(os.devnull, "w") as fd:
        monkeypatch.setattr(sys, "stderr", fd)
        yield


@pytest.fixture
def xonsh_events():
    yield events
    for name, oldevent in vars(events).items():
        # Heavily based on transmogrification
        species = oldevent.species
        newevent = events._mkevent(name, species, species.__doc__)
        setattr(events, name, newevent)


@pytest.fixture(scope="session")
def session_os_env():
    """Env with values from os.environ like real session"""
    from xonsh.environ import Env, default_env

    return Env(default_env())


@pytest.fixture(scope="session")
def session_env():
    """Env with some initial values that doesn't load from os.environ"""
    from xonsh.environ import Env

    initial_vars = {
        "UPDATE_OS_ENVIRON": False,
        "XONSH_DEBUG": 1,
        "XONSH_COLOR_STYLE": "default",
        "VC_BRANCH_TIMEOUT": 1,
        "XONSH_ENCODING": "utf-8",
        "XONSH_ENCODING_ERRORS": "strict",
        "COMMANDS_CACHE_SAVE_INTERMEDIATE": False,
    }
    env = Env(initial_vars)
    return env


@pytest.fixture(scope="session")
def session_execer():
    return Execer()


@pytest.fixture
def os_env(session_os_env):
    """A mutable copy of Original session_os_env"""

    return copy_env(session_os_env)


@pytest.fixture
def env(tmpdir, session_env):
    """a mutable copy of session_env"""
    env_copy = copy_env(session_env)
    initial_vars = {"XONSH_DATA_DIR": str(tmpdir)}

    env_copy.update(initial_vars)
    return env_copy


@pytest.fixture
def xonsh_session(xonsh_events, session_execer, os_env, monkeypatch) -> XonshSession:
    """a fixture to use where XonshSession is fully loaded without any mocks"""

    XSH.load(
        ctx={},
        execer=session_execer,
        commands_cache=commands_cache.CommandsCache(),
        env=os_env,
    )
    yield XSH
    XSH.unload()
    tasks.clear()  # must to this to enable resetting all_jobs


@pytest.fixture
def mock_xonsh_session(monkeypatch, xonsh_events, xonsh_session, env):
    """Mock out most of the builtins xonsh attributes."""

    # make sure that all other fixtures call this mock only one time
    session = []

    def factory(*attrs: str):
        """

        Parameters
        ----------
        attrs
            do not mock the given attributes

        Returns
        -------
        XonshSession
            with most of the attributes mocked out
        """
        if session:
            raise RuntimeError("The factory should be called only once per test")

        for attr, val in [
            ("env", env),
            ("shell", DummyShell()),
            ("help", lambda x: x),
            ("aliases", Aliases()),
            ("exit", False),
            ("history", DummyHistory()),
            (
                "commands_cache",
                commands_cache.CommandsCache(),
            ),  # since env,aliases change , patch cmds-cache
            # ("subproc_captured", sp),
            ("subproc_uncaptured", sp),
            ("subproc_captured_stdout", sp),
            ("subproc_captured_inject", sp),
            ("subproc_captured_object", sp),
            ("subproc_captured_hiddenobject", sp),
        ]:
            if attr in attrs:
                continue
            monkeypatch.setattr(xonsh_session, attr, val)

        for attr, val in [
            ("evalx", eval),
            ("execx", None),
            ("compilex", None),
            # Unlike all the other stuff, this has to refer to the "real" one because all modules that would
            # be firing events on the global instance.
            ("events", xonsh_events),
        ]:
            # attributes to builtins are dynamicProxy and should pickup the following
            monkeypatch.setattr(xonsh_session.builtins, attr, val)

        session.append(xonsh_session)
        return xonsh_session

    yield factory
    session.clear()


@pytest.fixture
def xession(mock_xonsh_session) -> XonshSession:
    """Mock out most of the builtins xonsh attributes."""
    return mock_xonsh_session()


@pytest.fixture
def xsh_with_aliases(mock_xonsh_session) -> XonshSession:
    return mock_xonsh_session("aliases")


@pytest.fixture(scope="session")
def completion_context_parse():
    return CompletionContextParser().parse


@pytest.fixture
def check_completer():
    """Helper function to run completer and parse the results as set of strings"""
    completer = Completer()

    def _factory(line: str, prefix="", send_original=False):
        completions, _ = completer.complete_line(line, prefix=prefix)
        values = {getattr(i, "value", i).strip() for i in completions}

        if send_original:
            # just return the bare completions without appended-space for easier assertions
            return values, completions

        return values

    return _factory


@pytest.fixture
def ptk_shell(xonsh_execer):
    from prompt_toolkit.input import create_pipe_input
    from prompt_toolkit.output import DummyOutput
    from xonsh.ptk_shell.shell import PromptToolkitShell

    inp = create_pipe_input()
    out = DummyOutput()
    shell = PromptToolkitShell(
        execer=xonsh_execer, ctx={}, ptk_args={"input": inp, "output": out}
    )
    yield inp, out, shell
    inp.close()


@pytest.fixture
def readline_shell(xonsh_execer, tmpdir, mocker):
    from xonsh.readline_shell import ReadlineShell

    inp_path = tmpdir / "in"
    inp = inp_path.open("w+")
    out_path = tmpdir / "out"
    out = out_path.open("w+")

    shell = ReadlineShell(execer=xonsh_execer, ctx={}, stdin=inp, stdout=out)
    mocker.patch.object(shell, "_load_remaining_input_into_queue")
    yield shell
    inp.close()
    out.close()


def pytest_configure(config):
    """Abort test run if --flake8 requested, since it would hang on parser_test.py"""
    if config.getoption("--flake8", ""):
        pytest.exit("pytest-flake8 no longer supported, use flake8 instead.")


@pytest.fixture
def load_xontrib():
    to_unload = []

    def wrapper(*names: str):
        from xonsh.xontribs import xontribs_load

        for name in names:
            module = f"xontrib.{name}"
            if module not in sys.modules:
                to_unload.append(module)

            xontribs_load([name])
        return

    yield wrapper

    for mod in to_unload:
        del sys.modules[mod]