import json
from functools import wraps
import sqlite3
from flask import current_app, jsonify
from flask_jwt_extended import (
    create_access_token,
    create_refresh_token,
    current_user,
    get_jwt_identity,
    jwt_required,
    set_access_cookies,
)
from pydantic import BaseModel, Field
from flask_openapi3 import Tag
from flask_openapi3 import APIBlueprint

from swingmusic.db.userdata import UserTable
from swingmusic.utils.auth import check_password, hash_password
from swingmusic.config import UserConfig

bp_tag = Tag(name="Auth", description="Authentication stuff")
api = APIBlueprint("auth", __name__, url_prefix="/auth", abp_tags=[bp_tag])


def admin_required():
    """
    Decorator to require admin role
    """

    def wrapper(fn):
        @wraps(fn)
        def decorator(*args, **kwargs):
            if "admin" not in current_user["roles"]:
                return {"msg": "Only admins can do that!"}, 403
            return fn(*args, **kwargs)

        return decorator

    return wrapper


def create_new_token(user: dict):
    """
    Create a new token response
    """
    access_token = create_access_token(identity=user)
    max_age: int = current_app.config.get("JWT_ACCESS_TOKEN_EXPIRES")

    return {
        "msg": f"Logged in as {user['username']}",
        "accesstoken": access_token,
        "refreshtoken": create_refresh_token(identity=user),
        "maxage": max_age,
    }


class LoginBody(BaseModel):
    username: str = Field(description="The username", example="user0")
    password: str = Field(description="The password", example="password0")


@api.post("/login")
def login(body: LoginBody):
    """
    Authenticate using username and password
    """

    user = UserTable.get_by_username(body.username)

    if user is None:
        return {"msg": "User not found"}, 404

    password_ok = check_password(body.password, user.password)

    if not password_ok:
        return {"msg": "Hehe! invalid password"}, 401

    res = create_new_token(user.todict())
    token = res["accesstoken"]
    age = res["maxage"]
    res = jsonify(res)
    set_access_cookies(res, token, max_age=age)

    return res


pair_token = dict()


@api.get("/getpaircode")
def get_pair():
    """
    Get a new pair code to log in to thee Swing Music mobile app
    """
    # INFO: if user is already logged in, create a new pair code
    token = create_new_token(get_jwt_identity())
    key = token["accesstoken"][-6:]

    global pair_token
    pair_token = {
        key: token,
    }

    return {"code": key}


class PairDeviceQuery(BaseModel):
    code: str = Field("", description="The code")


@api.get("/pair")
@jwt_required(optional=True)
def pair_with_code(query: PairDeviceQuery):
    """
    Get an access token by sending a pair code. NOTE: A code can only be used once!
    """
    global pair_token
    token = pair_token.get(query.code, None)

    if token:
        pair_token = {}
        return token

    return {"msg": "Invalid code"}, 400


@api.post("/refresh")
@jwt_required(refresh=True)
def refresh():
    """
    Refresh an access token by sending a refresh token in the Authorization header

    >>> Headers:
    >>> Authorization: Bearer <refresh_token>

    Won't work with cookies!!!
    """
    user = get_jwt_identity()
    return create_new_token(user)


class UpdateProfileBody(BaseModel):
    id: int = Field(0, description="The user id")
    email: str = Field("", description="The email")
    username: str = Field("", description="The username", example="user0")
    password: str = Field("", description="The password", example="password0")
    roles: list[str] = Field(None, description="The roles")


@api.put("/profile/update")
def update_profile(body: UpdateProfileBody):
    """
    Update user profile
    """
    user = {
        "id": body.id,
        "username": body.username,
        "password": body.password,
        "roles": body.roles,
    }

    # prevent updating guest
    if current_user["username"] == "guest" or user["username"] == "guest":
        return {"msg": "Cannot update guest user"}, 400

    # if not id, update self
    if not user["id"]:
        user["id"] = current_user["id"]

    if body.roles is not None:
        # only admins can update roles
        if "admin" not in current_user["roles"]:
            return {"msg": "Only admins can update roles"}, 403

        # all_users = authdb.get_all_users()
        all_users = UserTable.get_all()
        if "admin" not in body.roles:
            # check if we're removing the last admin
            admins = [user for user in all_users if "admin" in user.roles]

            if len(admins) == 1 and admins[0].id == user["id"]:
                return {"msg": "Cannot remove the only admin"}, 400

        # guest roles cannot be updated
        _user = [u for u in all_users if u.id == user["id"]][0]
        if "guest" in _user.roles:
            return {"msg": "Cannot update guest user"}, 400

        # finally, convert roles to json string
        user["roles"] = json.dumps(body.roles)

    if user["password"]:
        user["password"] = hash_password(user["password"])

    # remove empty values
    clean_user = {k: v for k, v in user.items() if v}

    try:
        # return authdb.update_user(clean_user)
        UserTable.update_one(clean_user)
        return UserTable.get_by_id(user["id"]).todict()
    except sqlite3.IntegrityError:
        return {"msg": "Username already exists"}, 400


@api.post("/profile/create")
@admin_required()
def create_user(body: UpdateProfileBody):
    """
    Create a new user
    """
    if not body.username or not body.password:
        return {"msg": "Username and password are required"}, 400

    user = {
        "username": body.username,
        "password": hash_password(body.password),
        "roles": json.dumps([]),
    }

    # check if user already exists
    if UserTable.get_by_username(user["username"]):
        return {"msg": "Username already exists"}, 400

    UserTable.insert_one(user)
    user = UserTable.get_by_username(user["username"])

    if user:
        return user.todict()

    return {
        "msg": "Failed to create user",
    }, 500


@api.post("/profile/guest/create")
@admin_required()
def create_guest_user():
    """
    Create a guest user
    """
    # check if guest user already exists
    guest_user = UserTable.get_by_username("guest")

    if guest_user:
        return {
            "msg": "Guest user already exists",
        }, 400

    userid = UserTable.insert_guest_user()

    if userid:
        return {
            "msg": "Guest user created",
        }

    return {
        "msg": "Failed to create guest user",
    }, 500


class DeleteUseBody(BaseModel):
    username: str = Field("", description="The username")


@api.delete("/profile/delete")
@admin_required()
def delete_user(body: DeleteUseBody):
    """
    Delete a user by username
    """
    # prevent admin from deleting themselves
    if body.username == current_user["username"]:
        return {"msg": "Sorry! you cannot delete yourselfu"}, 400

    # prevent deleting the only admin
    users = UserTable.get_all()
    admins = [user for user in users if "admin" in user.roles]
    if len(admins) == 1 and admins[0].username == body.username:
        return {"msg": "Cannot delete the only admin"}, 400

    UserTable.remove_by_username(body.username)
    return {"msg": f"User {body.username} deleted"}


@api.get("/logout")
def logout():
    """
    Log out and clear the access token cookie
    """
    res = jsonify({"msg": "Logged out"})
    res.delete_cookie("access_token_cookie")
    return res


class GetAllUsersQuery(BaseModel):
    simplified: bool = Field(
        False, description="Whether to return simplified user data"
    )


@api.get("/users")
@jwt_required(optional=True)
def get_all_users(query: GetAllUsersQuery):
    """
    Get all users (if you're an admin, you will also receive accounts settings)
    """
    config = UserConfig()
    settings = {
        "enableGuest": False,
        "usersOnLogin": config.usersOnLogin,
    }

    res = {
        "settings": {},
        "users": [],
    }

    users = [u for u in UserTable.get_all()]
    is_admin = current_user and "admin" in current_user["roles"]
    settings["enableGuest"] = [
        user for user in users if user.username == "guest"
    ].__len__() > 0

    # if user is admin, also return settings
    if is_admin:
        res = {
            "settings": settings,
        }

    # if is normal user, return empty response
    elif current_user:
        return res

    # if not logged in and showing users on login is disabled, return empty response
    elif (
        not current_user
        and not settings["usersOnLogin"]
        and not settings["enableGuest"]
    ):
        return res

    # remove guest user
    # if not settings["enableGuest"]:
    #     users = [user for user in users if user.username != "guest"]

    if not settings["usersOnLogin"]:
        users = [user for user in users if user.username == "guest"]

    # reverse list to show latest users first
    users = reversed(users)
    # bring admins to the front
    users = sorted(users, key=lambda x: "admin" in x.roles, reverse=True)
    # bring current user to index 0
    if current_user:
        users = sorted(
            users,
            key=lambda x: x.username == current_user["username"],
            reverse=True,
        )

    if query.simplified:
        res["users"] = [user.todict_simplified() for user in users]
    else:
        res["users"] = [user.todict() for user in users]

    return res


@api.get("/user")
def get_logged_in_user():
    """
    Get logged in user
    """
    return dict(current_user)