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use crate::client::Client;
use crate::error;
use crate::message::{FromPubSubMessage, Message};
use hyper::body::Buf;
use hyper::{Method, StatusCode};
use lazy_static::lazy_static;
use serde_derive::{Deserialize, Serialize};
use std::env;

lazy_static! {
    static ref PUBSUB_HOST: String = env::var("PUBSUB_EMULATOR_HOST")
        .map(|host| format!("http://{}", host))
        .unwrap_or_else(|_| String::from("https://pubsub.googleapis.com"));
}

#[derive(Deserialize)]
struct Response {
    #[serde(alias = "receivedMessages")]
    received_messages: Option<Vec<Message>>,
    error: Option<error::Error>,
}

#[derive(Serialize)]
struct AckRequest {
    #[serde(alias = "ackIds")]
    ack_ids: Vec<String>,
}

#[derive(Deserialize, Serialize, Clone)]
pub struct Subscription {
    #[serde(skip_serializing)]
    pub name: String,
    pub topic: Option<String>,

    #[serde(skip)]
    pub(crate) client: Option<Client>,
}

impl Subscription {
    pub async fn acknowledge_messages(&self, ids: Vec<String>) {
        let client = self
            .client
            .as_ref()
            .expect("Subscription was not created using a client");

        let uri: hyper::Uri = format!("{}/v1/{}:acknowledge", *PUBSUB_HOST, self.name)
            .parse()
            .unwrap();

        let json = serde_json::to_string(&AckRequest { ack_ids: ids }).unwrap();

        let mut req = client.request(Method::POST, json);
        *req.uri_mut() = uri.clone();

        if let Err(e) = client.hyper_client().request(req).await {
            log::error!("Failed ACK: {}", e);
        }
    }

    pub async fn get_messages<T: FromPubSubMessage>(
        &self,
    ) -> Result<Vec<(Result<T, error::Error>, String)>, error::Error> {
        let client = self
            .client
            .as_ref()
            .expect("Subscription was not created using a client");

        let uri: hyper::Uri = format!("{}/v1/{}:pull", *PUBSUB_HOST, self.name)
            .parse()
            .unwrap();

        let json = r#"{"maxMessages": 100}"#;

        let mut req = client.request(Method::POST, json);
        *req.uri_mut() = uri.clone();

        let response = client.hyper_client().request(req).await?;

        if response.status() == StatusCode::NOT_FOUND {
            return Err(error::Error::PubSub {
                code: 404,
                status: "Subscription Not Found".to_string(),
                message: self.name.clone(),
            });
        }
        let body = hyper::body::aggregate(response).await?;
        let response: Response = serde_json::from_reader(body.reader())?;
        if let Some(e) = response.error {
            return Err(e);
        }
        let messages = response
            .received_messages
            .unwrap_or_default()
            .into_iter()
            .map(|m| (T::from(m.message), m.ack_id))
            .collect();
        Ok(messages)
    }

    pub async fn destroy(self) -> Result<(), error::Error> {
        let client = self
            .client
            .expect("Subscription was not created using a client");

        let uri: hyper::Uri = format!("{}/v1/{}", *PUBSUB_HOST, self.name)
            .parse()
            .unwrap();

        let mut req = client.request(Method::DELETE, "");
        *req.uri_mut() = uri.clone();

        if let Err(e) = client.hyper_client().request(req).await {
            Err(e.into())
        } else {
            Ok(())
        }
    }

    pub fn client(&self) -> &Client {
        self.client.as_ref().unwrap()
    }
}