# Copyright 2019 Novartis Institutes for BioMedical Research Inc. 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 os

from flask_api import status

import env
from cellxgene_exception import CellxgeneException


def is_subdir(full_path, parent_path):
    subdir = os.path.realpath(full_path)
    parent = os.path.realpath(parent_path)
    return subdir.startswith(parent)


def create_dir(parent_path, dir_name):
    full_path = os.path.join(parent_path, dir_name)

    if "/" in dir_name:
        raise CellxgeneException(
            "Please have no slashes in the intended directory.",
            status.HTTP_400_BAD_REQUEST,
        )
    elif not os.path.exists(parent_path):
        raise CellxgeneException(
            "The selected User directory does not exist.", status.HTTP_400_BAD_REQUEST
        )
    elif os.path.exists(full_path):
        raise CellxgeneException(
            "The provided subdirectory already exists within Directory.",
            status.HTTP_400_BAD_REQUEST,
        )
    elif not is_subdir(full_path, parent_path):
        raise CellxgeneException(
            "The directory must be a subdirectory of the parent path.",
            status.HTTP_400_BAD_REQUEST,
        )
    elif not os.path.isdir(parent_path):
        raise CellxgeneException(
            "The parent is not a directory.", status.HTTP_400_BAD_REQUEST
        )
    else:
        os.mkdir(full_path)


def recurse_dir(path):
    if not os.path.exists(path):
        raise CellxgeneException(
            "The given path does not exist.", status.HTTP_400_BAD_REQUEST
        )

    def make_entry(el):
        full_path = os.path.join(path, el)
        if os.path.isfile(full_path):
            return {
                "path": full_path.replace(env.cellxgene_data, ""),
                "name": el,
                "type": "file",
            }
        elif os.path.isdir(full_path):
            return {
                "path": full_path,
                "name": el,
                "type": "directory",
                "children": recurse_dir(full_path),
            }
        else:
            raise CellxgeneException(
                "Given path is neither file nor directory.", status.HTTP_400_BAD_REQUEST
            )

    return [make_entry(x) for x in os.listdir(path)]


def render_entries(entries):
    return "<ul>" + "\n".join([render_entry(e) for e in entries]) + "</ul>"


def render_entry(entry):
    if entry["type"] == "file":
        return f"<li> <a target='_blank' href='view{entry['path']}'>{entry['name']}</a></li>"
    elif entry["type"] == "directory":
        return f"<li>{entry['name']}{render_entries(entry['children'])}</li>"