use std::cell::RefCell;
use std::collections::HashMap;
use std::fmt;
use std::rc::Rc;

use reqwest::Client;
use serde::{Deserialize, Serialize};

use crate::api::{Limit, LimitType};
use crate::errors::ChorusResult;
use crate::ratelimiter::ChorusRequest;
use crate::types::types::subconfigs::limits::rates::RateLimits;
use crate::types::{GeneralConfiguration, User, UserSettings};
use crate::UrlBundle;

#[derive(Debug, Clone)]
/**
The [`Instance`] what you will be using to perform all sorts of actions on the Spacebar server.
If `limits_information` is `None`, then the instance will not be rate limited.
 */
pub struct Instance {
    pub urls: UrlBundle,
    pub instance_info: GeneralConfiguration,
    pub limits_information: Option<LimitsInformation>,
    pub client: Client,
}

#[derive(Debug, Clone)]
pub struct LimitsInformation {
    pub ratelimits: HashMap<LimitType, Limit>,
    pub configuration: RateLimits,
}

impl Instance {
    /// Creates a new [`Instance`].
    /// # Arguments
    /// * `urls` - The [`URLBundle`] that contains all the URLs that are needed to connect to the Spacebar server.
    /// * `requester` - The [`LimitedRequester`] that will be used to make requests to the Spacebar server.
    /// # Errors
    /// * [`InstanceError`] - If the instance cannot be created.
    pub async fn new(urls: UrlBundle, limited: bool) -> ChorusResult<Instance> {
        let limits_information;
        if limited {
            let limits_configuration =
                Some(ChorusRequest::get_limits_config(&urls.api).await?.rate);
            let limits = Some(ChorusRequest::limits_config_to_hashmap(
                limits_configuration.as_ref().unwrap(),
            ));
            limits_information = Some(LimitsInformation {
                ratelimits: limits.unwrap(),
                configuration: limits_configuration.unwrap(),
            });
        } else {
            limits_information = None;
        }
        let mut instance = Instance {
            urls: urls.clone(),
            // Will be overwritten in the next step
            instance_info: GeneralConfiguration::default(),
            limits_information,
            client: Client::new(),
        };
        instance.instance_info = match instance.general_configuration_schema().await {
            Ok(schema) => schema,
            Err(e) => {
                log::warn!("Could not get instance configuration schema: {}", e);
                GeneralConfiguration::default()
            }
        };
        Ok(instance)
    }
    pub(crate) fn clone_limits_if_some(&self) -> Option<HashMap<LimitType, Limit>> {
        if self.limits_information.is_some() {
            return Some(self.limits_information.as_ref().unwrap().ratelimits.clone());
        }
        None
    }
}

#[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
pub struct Token {
    pub token: String,
}

impl fmt::Display for Token {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}", self.token)
    }
}

#[derive(Debug)]
pub struct UserMeta {
    pub belongs_to: Rc<RefCell<Instance>>,
    pub token: String,
    pub limits: Option<HashMap<LimitType, Limit>>,
    pub settings: UserSettings,
    pub object: User,
}

impl UserMeta {
    pub fn token(&self) -> String {
        self.token.clone()
    }

    pub fn set_token(&mut self, token: String) {
        self.token = token;
    }

    pub fn new(
        belongs_to: Rc<RefCell<Instance>>,
        token: String,
        limits: Option<HashMap<LimitType, Limit>>,
        settings: UserSettings,
        object: User,
    ) -> UserMeta {
        UserMeta {
            belongs_to,
            token,
            limits,
            settings,
            object,
        }
    }

    /// Creates a new 'shell' of a user. The user does not exist as an object, and exists so that you have
    /// a UserMeta object to make Rate Limited requests with. This is useful in scenarios like
    /// registering or logging in to the Instance, where you do not yet have a User object, but still
    /// need to make a RateLimited request.
    pub(crate) fn shell(instance: Rc<RefCell<Instance>>, token: String) -> UserMeta {
        let settings = UserSettings::default();
        let object = User::default();
        UserMeta {
            belongs_to: instance.clone(),
            token,
            limits: instance
                .borrow()
                .limits_information
                .as_ref()
                .map(|info| info.ratelimits.clone()),
            settings,
            object,
        }
    }
}