# Copyright (c) Jupyter Development Team.
# Distributed under the terms of the Modified BSD License.
"""Test config file migration"""
from __future__ import annotations

import os
import re
import shutil
from tempfile import mkdtemp
from unittest.mock import patch

import pytest

from jupyter_core import migrate as migrate_mod
from jupyter_core.application import JupyterApp
from jupyter_core.migrate import (
    migrate,
    migrate_config,
    migrate_dir,
    migrate_file,
    migrate_one,
    migrate_static_custom,
)
from jupyter_core.utils import ensure_dir_exists

pjoin = os.path.join
here = os.path.dirname(__file__)
dotipython = pjoin(here, "dotipython")
dotipython_empty = pjoin(here, "dotipython_empty")


@pytest.fixture()
def td(request):
    """Fixture for a temporary directory"""
    td = mkdtemp("μnïcø∂e")
    yield td
    shutil.rmtree(td)


@pytest.fixture()
def env(request):
    """Fixture for a full testing environment"""
    td = mkdtemp()
    env = {
        "TESTDIR": td,
        "IPYTHONDIR": pjoin(td, "ipython"),
        "JUPYTER_CONFIG_DIR": pjoin(td, "jupyter"),
        "JUPYTER_DATA_DIR": pjoin(td, "jupyter_data"),
        "JUPYTER_RUNTIME_DIR": pjoin(td, "jupyter_runtime"),
        "JUPYTER_PATH": "",
    }
    env_patch = patch.dict(os.environ, env)
    env_patch.start()

    yield env

    env_patch.stop()
    shutil.rmtree(td, ignore_errors=os.name == "nt")


def touch(path, content=""):
    ensure_dir_exists(os.path.dirname(path))
    with open(path, "w", encoding="utf-8") as f:
        f.write(content)


def assert_files_equal(a, b):
    """Verify that two files match"""

    assert os.path.exists(b)
    with open(a, encoding="utf-8") as f:
        a_txt = f.read()

    with open(b, encoding="utf-8") as f:
        b_txt = f.read()

    assert a_txt == b_txt


def test_migrate_file(td):
    src = pjoin(td, "src")
    dst = pjoin(td, "dst")
    touch(src, "test file")
    assert migrate_file(src, dst)
    assert_files_equal(src, dst)

    src2 = pjoin(td, "src2")
    touch(src2, "different src")
    assert not migrate_file(src2, dst)
    assert_files_equal(src, dst)


def test_migrate_dir(td):
    src = pjoin(td, "src")
    dst = pjoin(td, "dst")
    os.mkdir(src)
    assert not migrate_dir(src, dst)
    assert not os.path.exists(dst)

    touch(pjoin(src, "f"), "test file")
    assert migrate_dir(src, dst)
    assert_files_equal(pjoin(src, "f"), pjoin(dst, "f"))

    touch(pjoin(src, "g"), "other test file")
    assert not migrate_dir(src, dst)
    assert not os.path.exists(pjoin(dst, "g"))

    shutil.rmtree(dst)
    os.mkdir(dst)
    assert migrate_dir(src, dst)
    assert_files_equal(pjoin(src, "f"), pjoin(dst, "f"))
    assert_files_equal(pjoin(src, "g"), pjoin(dst, "g"))


def test_migrate_one(td):
    src = pjoin(td, "src")
    srcdir = pjoin(td, "srcdir")
    dst = pjoin(td, "dst")
    dstdir = pjoin(td, "dstdir")

    touch(src, "test file")
    touch(pjoin(srcdir, "f"), "test dir file")

    called = {}

    def notice_m_file(src, dst):
        called["migrate_file"] = True
        return migrate_file(src, dst)

    def notice_m_dir(src, dst):
        called["migrate_dir"] = True
        return migrate_dir(src, dst)

    with patch.object(migrate_mod, "migrate_file", notice_m_file), patch.object(
        migrate_mod, "migrate_dir", notice_m_dir
    ):
        assert migrate_one(src, dst)
        assert called == {"migrate_file": True}
        called.clear()
        assert migrate_one(srcdir, dstdir)
        assert called == {"migrate_dir": True}
        called.clear()
        assert not migrate_one(pjoin(td, "does_not_exist"), dst)
        assert called == {}


def test_migrate_config(td):
    profile = pjoin(td, "profile")
    jpy = pjoin(td, "jupyter_config")
    ensure_dir_exists(profile)

    env = {
        "profile": profile,
        "jupyter_config": jpy,
    }
    cfg_py = pjoin(profile, "ipython_test_config.py")
    touch(cfg_py, "c.Klass.trait = 5\n")
    empty_cfg_py = pjoin(profile, "ipython_empty_config.py")
    touch(empty_cfg_py, "# c.Klass.trait = 5\n")

    assert not migrate_config("empty", env)
    assert not os.path.exists(jpy)

    with patch.dict(
        migrate_mod.config_substitutions,
        {
            re.compile(r"\bKlass\b"): "Replaced",
        },
    ):
        assert migrate_config("test", env)

    assert os.path.isdir(jpy)
    assert sorted(os.listdir(jpy)) == [
        "jupyter_test_config.py",
    ]

    with open(pjoin(jpy, "jupyter_test_config.py"), encoding="utf-8") as f:
        text = f.read()
    assert text == "c.Replaced.trait = 5\n"


def test_migrate_custom_default(td):
    profile = pjoin(dotipython, "profile_default")
    src = pjoin(profile, "static", "custom")
    assert os.path.exists(src)
    assert not migrate_static_custom(src, td)

    src = pjoin(td, "src")
    dst = pjoin(td, "dst")
    os.mkdir(src)
    src_custom_js = pjoin(src, "custom.js")
    src_custom_css = pjoin(src, "custom.css")
    touch(src_custom_js, "var a=5;")
    touch(src_custom_css, "div { height: 5px; }")

    assert migrate_static_custom(src, dst)


def test_migrate_nothing(env):
    migrate()
    assert os.listdir(env["JUPYTER_CONFIG_DIR"]) == ["migrated"]
    assert not os.path.exists(env["JUPYTER_DATA_DIR"])


def test_migrate_default(env):
    shutil.copytree(dotipython_empty, env["IPYTHONDIR"])
    migrate()
    assert os.listdir(env["JUPYTER_CONFIG_DIR"]) == ["migrated"]
    assert not os.path.exists(env["JUPYTER_DATA_DIR"])


def test_migrate(env):
    shutil.copytree(dotipython, env["IPYTHONDIR"])
    migrate()
    assert os.path.exists(env["JUPYTER_CONFIG_DIR"])
    assert os.path.exists(env["JUPYTER_DATA_DIR"])


def test_app_migrate(env):
    shutil.copytree(dotipython, env["IPYTHONDIR"])
    app = JupyterApp()
    app.initialize([])
    assert os.path.exists(env["JUPYTER_CONFIG_DIR"])
    assert os.path.exists(env["JUPYTER_DATA_DIR"])


def test_app_migrate_skip_if_marker(env):
    shutil.copytree(dotipython, env["IPYTHONDIR"])
    touch(pjoin(env["JUPYTER_CONFIG_DIR"], "migrated"), "done")
    app = JupyterApp()
    app.initialize([])
    assert os.listdir(env["JUPYTER_CONFIG_DIR"]) == ["migrated"]
    assert not os.path.exists(env["JUPYTER_DATA_DIR"])


def test_app_migrate_skip_unwritable_marker(env):
    shutil.copytree(dotipython, env["IPYTHONDIR"])
    migrated_marker = pjoin(env["JUPYTER_CONFIG_DIR"], "migrated")
    touch(migrated_marker, "done")
    os.chmod(migrated_marker, 0)  # make it unworkable
    app = JupyterApp()
    app.initialize([])
    assert os.listdir(env["JUPYTER_CONFIG_DIR"]) == ["migrated"]
    assert not os.path.exists(env["JUPYTER_DATA_DIR"])