# Copyright 2023 Avaiga Private Limited
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
# an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
# specific language governing permissions and limitations under the License.

import filecmp
import os
import shutil
import sys
from unittest.mock import patch

import mongomock
import pytest

from src.taipy.core._entity._migrate_cli import _MigrateCLI


@pytest.fixture(scope="function", autouse=True)
def clean_data_folder():
    if os.path.exists("tests/core/_entity/.data"):
        shutil.rmtree("tests/core/_entity/.data")
    yield


def test_migrate_fs_default(caplog):
    _MigrateCLI.create_parser()

    # Test migrate with default .data folder
    with pytest.raises(SystemExit):
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "filesystem", "--skip-backup"]):
            _MigrateCLI.parse_arguments()
    assert "Starting entity migration from '.data' folder" in caplog.text


def test_migrate_fs_specified_folder(caplog):
    _MigrateCLI.create_parser()

    # Copy data_sample to .data folder for testing
    data_sample_path = "tests/core/_entity/data_sample"
    data_path = "tests/core/_entity/.data"
    shutil.copytree(data_sample_path, data_path)

    # Run with --skip-backup to only test the migration
    with pytest.raises(SystemExit):
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "filesystem", data_path, "--skip-backup"]):
            _MigrateCLI.parse_arguments()
    assert f"Starting entity migration from '{data_path}' folder" in caplog.text

    # Compare migrated .data folder with data_sample_migrated
    dircmp_result = filecmp.dircmp(data_path, "tests/core/_entity/data_sample_migrated")
    assert not dircmp_result.diff_files and not dircmp_result.left_only and not dircmp_result.right_only
    for subdir in dircmp_result.subdirs.values():
        assert not subdir.diff_files and not subdir.left_only and not subdir.right_only


def test_migrate_fs_backup_and_remove(caplog):
    _MigrateCLI.create_parser()

    # Copy data_sample to .data folder for testing
    data_sample_path = "tests/core/_entity/data_sample"
    data_path = "tests/core/_entity/.data"
    backup_path = "tests/core/_entity/.data_backup"
    shutil.copytree(data_sample_path, data_path)

    # Remove backup when it does not exist should raise an error
    with pytest.raises(SystemExit) as err:
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "filesystem", data_path, "--remove-backup"]):
            _MigrateCLI.parse_arguments()
    assert err.value.code == 1
    assert f"The backup folder '{backup_path}' does not exist." in caplog.text
    assert not os.path.exists(backup_path)

    # Run without --skip-backup to create the backup folder
    with pytest.raises(SystemExit):
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "filesystem", data_path]):
            _MigrateCLI.parse_arguments()
    assert f"Backed up entities from '{data_path}' to '{backup_path}' folder before migration." in caplog.text

    assert os.path.exists(backup_path)

    # Remove backup
    with pytest.raises(SystemExit):
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "filesystem", data_path, "--remove-backup"]):
            _MigrateCLI.parse_arguments()
    assert f"Removed backup entities from the backup folder '{backup_path}'." in caplog.text
    assert not os.path.exists(backup_path)


def test_migrate_fs_backup_and_restore(caplog):
    _MigrateCLI.create_parser()

    # Copy data_sample to .data folder for testing
    data_sample_path = "tests/core/_entity/data_sample"
    data_path = "tests/core/_entity/.data"
    backup_path = "tests/core/_entity/.data_backup"
    shutil.copytree(data_sample_path, data_path)

    # Restore backup when it does not exist should raise an error
    with pytest.raises(SystemExit) as err:
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "filesystem", data_path, "--restore"]):
            _MigrateCLI.parse_arguments()
    assert err.value.code == 1
    assert f"The backup folder '{backup_path}' does not exist." in caplog.text
    assert not os.path.exists(backup_path)

    # Run without --skip-backup to create the backup folder
    with pytest.raises(SystemExit):
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "filesystem", data_path]):
            _MigrateCLI.parse_arguments()

    assert os.path.exists(backup_path)

    # restore the backup
    with pytest.raises(SystemExit):
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "filesystem", data_path, "--restore"]):
            _MigrateCLI.parse_arguments()
    assert f"Restored entities from the backup folder '{backup_path}' to '{data_path}'." in caplog.text
    assert not os.path.exists(backup_path)

    # Compare migrated .data folder with data_sample to ensure restoreing the backup worked
    dircmp_result = filecmp.dircmp(data_path, "tests/core/_entity/data_sample")
    assert not dircmp_result.diff_files and not dircmp_result.left_only and not dircmp_result.right_only
    for subdir in dircmp_result.subdirs.values():
        assert not subdir.diff_files and not subdir.left_only and not subdir.right_only


def test_migrate_fs_non_existing_folder(caplog):
    _MigrateCLI.create_parser()

    # Test migrate with a non-existing folder
    with pytest.raises(SystemExit) as err:
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "filesystem", "non-existing-folder"]):
            _MigrateCLI.parse_arguments()
    assert err.value.code == 1
    assert "Folder 'non-existing-folder' does not exist." in caplog.text


@patch("src.taipy.core._entity._migrate_cli._migrate_sql_entities")
def test_migrate_sql_specified_path(_migrate_sql_entities_mock, tmp_sqlite):
    _MigrateCLI.create_parser()

    # Test the _migrate_sql_entities is called once with the correct path
    with pytest.raises(SystemExit):
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "sql", tmp_sqlite, "--skip-backup"]):
            _MigrateCLI.parse_arguments()
            assert _migrate_sql_entities_mock.assert_called_once_with(path=tmp_sqlite)


def test_migrate_sql_backup_and_remove(caplog, tmp_sqlite):
    _MigrateCLI.create_parser()

    # Create the .sqlite file to test
    with open(tmp_sqlite, "w") as f:
        f.write("")

    file_name, file_extension = tmp_sqlite.rsplit(".", 1)
    backup_sqlite = f"{file_name}_backup.{file_extension}"

    # Remove backup when it does not exist should raise an error
    with pytest.raises(SystemExit) as err:
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "sql", tmp_sqlite, "--remove-backup"]):
            _MigrateCLI.parse_arguments()
    assert err.value.code == 1
    assert f"The backup database '{backup_sqlite}' does not exist." in caplog.text
    assert not os.path.exists(backup_sqlite)

    # Run without --skip-backup to create the backup database
    with pytest.raises(Exception):
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "sql", tmp_sqlite]):
            _MigrateCLI.parse_arguments()

    assert os.path.exists(backup_sqlite)

    # Remove backup
    with pytest.raises(SystemExit):
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "sql", tmp_sqlite, "--remove-backup"]):
            _MigrateCLI.parse_arguments()
    assert f"Removed backup entities from the backup database '{backup_sqlite}'." in caplog.text
    assert not os.path.exists(backup_sqlite)


@pytest.mark.skipif(sys.platform == "win32", reason="Does not run on windows due to PermissionError: [WinError 32]")
def test_migrate_sql_backup_and_restore(caplog, tmp_sqlite):
    _MigrateCLI.create_parser()

    # Create the .sqlite file to test
    with open(tmp_sqlite, "w") as f:
        f.write("")

    file_name, file_extension = tmp_sqlite.rsplit(".", 1)
    backup_sqlite = f"{file_name}_backup.{file_extension}"

    # Restore backup when it does not exist should raise an error
    with pytest.raises(SystemExit) as err:
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "sql", tmp_sqlite, "--restore"]):
            _MigrateCLI.parse_arguments()
    assert err.value.code == 1
    assert f"The backup database '{backup_sqlite}' does not exist." in caplog.text
    assert not os.path.exists(backup_sqlite)

    # Run without --skip-backup to create the backup database
    with pytest.raises(Exception):
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "sql", tmp_sqlite]):
            _MigrateCLI.parse_arguments()

    assert os.path.exists(backup_sqlite)

    # Restore the backup
    with pytest.raises(SystemExit):
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "sql", tmp_sqlite, "--restore"]):
            _MigrateCLI.parse_arguments()
    assert f"Restored entities from the backup database '{backup_sqlite}' to '{tmp_sqlite}'." in caplog.text
    assert not os.path.exists(backup_sqlite)


def test_migrate_sql_non_existing_path(caplog):
    _MigrateCLI.create_parser()

    # Test migrate without providing a path
    with pytest.raises(SystemExit) as err:
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "sql"]):
            _MigrateCLI.parse_arguments()

    assert err.value.code == 1
    assert "Missing the required sqlite path." in caplog.text

    caplog.clear()

    # Test migrate with a non-existing-path.sqlite file
    with pytest.raises(SystemExit) as err:
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "sql", "non-existing-path.sqlite"]):
            _MigrateCLI.parse_arguments()
    assert err.value.code == 1
    assert "File 'non-existing-path.sqlite' does not exist." in caplog.text


@patch("src.taipy.core._entity._migrate_cli._migrate_mongo_entities")
def test_call_to_migrate_mongo(_migrate_mongo_entities_mock):
    _MigrateCLI.create_parser()

    with pytest.raises(SystemExit):
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "mongo"]):
            _MigrateCLI.parse_arguments()
            assert _migrate_mongo_entities_mock.assert_called_once_with()

    with pytest.raises(SystemExit):
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "mongo", "host", "port", "user", "password"]):
            _MigrateCLI.parse_arguments()
            assert _migrate_mongo_entities_mock.assert_called_once_with("host", "port", "user", "password")


@mongomock.patch(servers=(("localhost", 27017),))
def test_migrate_mongo_backup_and_remove(caplog):
    _MigrateCLI.create_parser()

    mongo_backup_path = ".mongo_backup"

    # Remove backup when it does not exist should raise an error
    with pytest.raises(SystemExit) as err:
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "mongo", "--remove-backup"]):
            _MigrateCLI.parse_arguments()
    assert err.value.code == 1
    assert f"The backup folder '{mongo_backup_path}' does not exist." in caplog.text
    assert not os.path.exists(mongo_backup_path)

    # Run without --skip-backup to create the backup database
    with pytest.raises(Exception):
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "mongo"]):
            _MigrateCLI.parse_arguments()

    assert os.path.exists(mongo_backup_path)

    # Remove backup
    with pytest.raises(SystemExit):
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "mongo", "--remove-backup"]):
            _MigrateCLI.parse_arguments()
    assert f"Removed backup entities from the backup folder '{mongo_backup_path}'." in caplog.text
    assert not os.path.exists(mongo_backup_path)


@mongomock.patch(servers=(("localhost", 27017),))
def test_migrate_mongo_backup_and_restore(caplog):
    _MigrateCLI.create_parser()

    mongo_backup_path = ".mongo_backup"

    # Restore backup when it does not exist should raise an error
    with pytest.raises(SystemExit) as err:
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "mongo", "--restore"]):
            _MigrateCLI.parse_arguments()
    assert err.value.code == 1
    assert f"The backup folder '{mongo_backup_path}' does not exist." in caplog.text
    assert not os.path.exists(mongo_backup_path)

    # Run without --skip-backup to create the backup database
    with pytest.raises(Exception):
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "mongo"]):
            _MigrateCLI.parse_arguments()

    assert os.path.exists(mongo_backup_path)

    # Restore the backup
    with pytest.raises(SystemExit):
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "mongo", "--restore"]):
            _MigrateCLI.parse_arguments()
    assert f"Restored entities from the backup folder '{mongo_backup_path}'." in caplog.text
    assert not os.path.exists(mongo_backup_path)


def test_not_provide_valid_repository_type(caplog):
    _MigrateCLI.create_parser()

    with pytest.raises(SystemExit):
        with patch("sys.argv", ["prog", "migrate"]):
            _MigrateCLI.parse_arguments()
            assert "the following arguments are required: --repository-type" in caplog.text

    with pytest.raises(SystemExit):
        with patch("sys.argv", ["prog", "migrate", "--repository-type"]):
            _MigrateCLI.parse_arguments()
            assert "argument --repository-type: expected at least one argument" in caplog.text

    with pytest.raises(SystemExit):
        with patch("sys.argv", ["prog", "migrate", "--repository-type", "invalid-repository-type"]):
            _MigrateCLI.parse_arguments()
            assert "Unknown repository type invalid-repository-type" in caplog.text