import os
import sys
from pathlib import Path
from typing import Union

from dotenv import load_dotenv


def app_root_path():
    app_path = Path(sys.argv[0]).resolve()
    try:
        if app_path.parent.name == "bin":  # Installed in unixy hierachy
            return app_path.parents[1]
    except IndexError:
        pass
    return app_path.parent


# None will let direnv do its' thing
env_paths = [Path(".env"), app_root_path() / "etc/environment", None]

for env_path in env_paths:
    print("Loading environment from " + str(env_path))
    load_dotenv(dotenv_path=env_path)


class EnvService:
    # To be expanded upon later!
    def __init__(self):
        self.env = {}

    @staticmethod
    def environment_path_with_fallback(env_name, relative_fallback=None):
        dir = os.getenv(env_name)
        if dir != None:
            return Path(dir).resolve()

        if relative_fallback:
            app_relative = (app_root_path() / relative_fallback).resolve()
            if app_relative.exists():
                return app_relative

        return Path.cwd()

    @staticmethod
    def find_shared_file(file_name):
        share_file_paths = []
        share_dir = os.getenv("SHARE_DIR")
        if share_dir is not None:
            share_file_paths.append(Path(share_dir) / file_name)

        share_file_paths.extend(
            [
                app_root_path() / "share" / file_name,
                app_root_path() / file_name,
                Path(file_name),
            ]
        )

        for share_file_path in share_file_paths:
            if share_file_path.exists():
                return share_file_path.resolve()

        raise ValueError(f"Unable to find shared data file {file_name}")

    @staticmethod
    def get_allowed_guilds():
        # ALLOWED_GUILDS is a comma separated list of guild ids
        # It can also just be one guild ID
        # Read these allowed guilds and return as a list of ints
        try:
            allowed_guilds = os.getenv("ALLOWED_GUILDS")
        except:
            allowed_guilds = None

        if allowed_guilds is None:
            raise ValueError(
                "ALLOWED_GUILDS is not defined properly in the environment file!"
                "Please copy your server's guild ID and put it into ALLOWED_GUILDS in the .env file."
                'For example a line should look like: `ALLOWED_GUILDS="971268468148166697"`'
            )

        allowed_guilds = (
            allowed_guilds.split(",") if "," in allowed_guilds else [allowed_guilds]
        )
        allowed_guilds = [int(guild) for guild in allowed_guilds]
        return allowed_guilds

    @staticmethod
    def get_admin_roles():
        # ADMIN_ROLES is a comma separated list of string roles
        # It can also just be one role
        # Read these allowed roles and return as a list of strings
        try:
            admin_roles = os.getenv("ADMIN_ROLES")
        except:
            admin_roles = None

        if admin_roles is None:
            print(
                "ADMIN_ROLES is not defined properly in the environment file!"
                "Please copy your server's role and put it into ADMIN_ROLES in the .env file."
                'For example a line should look like: `ADMIN_ROLES="Admin"`'
            )
            print("Defaulting to allowing all users to use admin commands...")
            return [None]

        admin_roles = (
            admin_roles.lower().split(",")
            if "," in admin_roles
            else [admin_roles.lower()]
        )
        return admin_roles

    @staticmethod
    def get_dalle_roles():
        # DALLE_ROLES is a comma separated list of string roles
        # It can also just be one role
        # Read these allowed roles and return as a list of strings
        try:
            dalle_roles = os.getenv("DALLE_ROLES")
        except:
            dalle_roles = None

        if dalle_roles is None:
            print(
                "DALLE_ROLES is not defined properly in the environment file!"
                "Please copy your server's role and put it into DALLE_ROLES in the .env file."
                'For example a line should look like: `DALLE_ROLES="Dalle"`'
            )
            print("Defaulting to allowing all users to use Dalle commands...")
            return [None]

        dalle_roles = (
            dalle_roles.lower().split(",")
            if "," in dalle_roles
            else [dalle_roles.lower()]
        )
        return dalle_roles

    @staticmethod
    def get_gpt_roles():
        # GPT_ROLES is a comma separated list of string roles
        # It can also just be one role
        # Read these allowed roles and return as a list of strings
        try:
            gpt_roles = os.getenv("GPT_ROLES")
        except:
            gpt_roles = None

        if gpt_roles is None:
            print(
                "GPT_ROLES is not defined properly in the environment file!"
                "Please copy your server's role and put it into GPT_ROLES in the .env file."
                'For example a line should look like: `GPT_ROLES="Gpt"`'
            )
            print("Defaulting to allowing all users to use GPT commands...")
            return [None]

        gpt_roles = (
            gpt_roles.lower().strip().split(",")
            if "," in gpt_roles
            else [gpt_roles.lower()]
        )
        return gpt_roles

    @staticmethod
    def get_welcome_message():
        # WELCOME_MESSAGE is a default string used to welcome new members to the server if GPT3 is not available.
        # The string can be blank but this is not advised. If a string cannot be found in the .env file, the below string is used.
        # The string is DMd to the new server member as part of an embed.
        try:
            welcome_message = os.getenv("WELCOME_MESSAGE")
        except:
            welcome_message = "Hi there! Welcome to our Discord server!"
        return welcome_message

    @staticmethod
    def get_moderations_alert_channel():
        # MODERATIONS_ALERT_CHANNEL is a channel id where moderation alerts are sent to
        # The string can be blank but this is not advised. If a string cannot be found in the .env file, the below string is used.
        try:
            moderations_alert_channel = os.getenv("MODERATIONS_ALERT_CHANNEL")
        except:
            moderations_alert_channel = None
        return moderations_alert_channel

    @staticmethod
    def get_user_input_api_keys():
        try:
            user_input_api_keys = os.getenv("USER_INPUT_API_KEYS")
            if user_input_api_keys.lower().strip() == "true":
                return True
            else:
                return False
        except:
            return False

    @staticmethod
    def get_user_key_db_path() -> Union[Path, None]:
        try:
            user_key_db_path = os.getenv("USER_KEY_DB_PATH")
            if user_key_db_path is None:
                return None
            else:
                return Path(user_key_db_path)
        except:
            return None