from django.core.files.storage import Storage
from collections import namedtuple
import requests
import re
from gzip import GzipFile

import logging

logger = logging.getLogger(__name__)

SHARED_FOLDER = re.compile(r"https://drive.google.com/drive/folders/(\w+)")
SHARED_FILE = re.compile(r"https://drive.google.com/file/d/([\w\-]+)")

FILES_API = "https://www.googleapis.com/drive/v3/files"


class DriveObject(namedtuple("DriveObject", ("id", "name"))):
    @classmethod
    def from_string(cls, s):
        return cls(*s.split("/", 1))

    def __str__(self):
        return f"{self.id}/{self.name}"


class GDriveLinkStorage(Storage):
    is_writable = False

    def __init__(self, api_key):
        self.api_key = api_key
        super().__init__()

    def parse_id(self, name):
        parts = name.split("/")
        return parts[0]

    def extract_id(self, url, *patterns):
        logger.debug("EXTRACT_ID: %r", url)
        for pattern in patterns:
            match = pattern.match(url)
            if match:
                return match.groups()[0]
        raise FileNotFoundError(f"Not a valid url: {url}")

    def get_json(self, url):
        logger.debug("GET_JSON: %s", url)
        response = requests.get(url)
        data = response.json()
        logger.debug("Data: %r", data)
        return data

    def listdir(self, path) -> tuple[list[str], list[str]]:

        # used to test for valid connection parameters - should do something to validate API key here
        if path == "":
            return [], []

        logger.debug("LISTDIR: %s", path)
        folder_id = self.parse_id(path)
        url = f"{FILES_API}?q='{folder_id}'+in+parents&key={self.api_key}"
        data = self.get_json(url)
        files = []
        folders = []
        for x in data["files"]:
            if x["mimeType"] == "application/vnd.google-apps.folder":
                # folders.append(f"{x['id']}/{x['name']}")
                folders.append(DriveObject(x["id"], x["name"]))
            else:
                # files.append(f"{x['id']}/{x['name']}")
                files.append(DriveObject(x["id"], x["name"]))

        return folders, files

    def get_meta(self, name):
        file_id = self.parse_id(name)
        url = f"{FILES_API}/{file_id}?key={self.api_key}"
        return self.get_json(url)

    def open(self, name, mode="rb"):
        file_id = self.parse_id(name)
        url = f"{FILES_API}/{file_id}?alt=media&key={self.api_key}"
        logger.info("URL: %s", url)
        response = requests.get(url, stream=True)
        return GzipFile(name, "rb", 9, response.raw)

    def size(self, name):
        raise NotImplementedError()

    def delete(self, name):
        pass

    def url(self, name):
        logger.debug("URL: %r", name)
        file_id = self.parse_id(name)
        return f"https://drive.usercontent.google.com/download?export=download&id={file_id}&confirm=yes"

    def get_folder_id(self, url):
        try:
            return self.extract_id(url, SHARED_FOLDER)
        except FileNotFoundError:
            return None

    def get_file_id(self, url):
        try:
            return self.extract_id(url, SHARED_FILE)
        except FileNotFoundError:
            return None


"""
    def import_link(self, url) -> str:
        file_id = self.extract_id(url, SHARED_FILE)
        meta = self.get_meta(file_id)
        return f"{file_id}/{meta['name']}"

    def folder_import(self, url) -> list[str]:
        folder_id = self.extract_id(url, SHARED_FOLDER)
        _, files = self.listdir(folder_id)
        return files
"""