mod utils;

use crate::utils::start_server_and_client;
use bromine::prelude::*;
use bytes::Bytes;
use std::time::Duration;
use utils::call_counter::*;
use utils::get_free_port;
use utils::protocol::*;

/// Simple events are passed from the client to the server and responses
/// are emitted back to the client. Both will have received an event.
#[tokio::test]
async fn it_sends_events() {
    let port = get_free_port();
    let ctx = get_client_with_server(port).await;
    ctx.emit("ping", EmptyPayload).await.unwrap();

    // allow the event to be processed
    tokio::time::sleep(Duration::from_millis(10)).await;
    let counter = get_counter_from_context(&ctx).await;

    assert_eq!(counter.get("ping").await, 1);
    assert_eq!(counter.get("pong").await, 1);
}

/// Events sent to a specific namespace are handled by the namespace event handler
#[tokio::test]
async fn it_sends_namespaced_events() {
    let port = get_free_port();
    let ctx = get_client_with_server(port).await;
    ctx.emit_to("test", "ping", EmptyPayload).await.unwrap();
    ctx.emit_to("test", "pong", EmptyPayload).await.unwrap();

    // allow the event to be processed
    tokio::time::sleep(Duration::from_millis(10)).await;
    let counter = get_counter_from_context(&ctx).await;

    assert_eq!(counter.get("test:ping").await, 1);
    assert_eq!(counter.get("test:pong").await, 1);
}

/// When awaiting the reply to an event the handler for the event doesn't get called.
/// Therefore we expect it to have a call count of 0.
#[tokio::test]
async fn it_receives_responses() {
    let port = get_free_port();
    let ctx = get_client_with_server(port).await;
    let reply = ctx.emit("ping", EmptyPayload).await_reply().await.unwrap();
    let counter = get_counter_from_context(&ctx).await;

    assert_eq!(reply.name(), "pong");
    assert_eq!(counter.get("ping").await, 1);
    assert_eq!(counter.get("pong").await, 0);
}

/// When emitting errors from handlers the client should receive an error event
/// with the error that occurred on the server.
#[tokio::test]
async fn it_handles_errors() {
    let port = get_free_port();
    let ctx = get_client_with_server(port).await;
    ctx.emit("create_error", EmptyPayload).await.unwrap();
    // allow the event to be processed
    tokio::time::sleep(Duration::from_millis(10)).await;
    let counter = get_counter_from_context(&ctx).await;

    assert_eq!(counter.get("error").await, 1);
}

/// When waiting for the reply to an event and an error occurs, the error should
/// bypass the handler and be passed as the Err variant on the await reply instead.
#[tokio::test]
async fn it_receives_error_responses() {
    let port = get_free_port();
    let ctx = get_client_with_server(port).await;
    let result = ctx
        .emit("create_error", EmptyPayload)
        .await_reply()
        .with_timeout(Duration::from_millis(100))
        .await;

    let counter = get_counter_from_context(&ctx).await;

    assert!(result.is_err());
    assert_eq!(counter.get("error").await, 0);
}

async fn get_client_with_server(port: u8) -> Context {
    start_server_and_client(move || get_builder(port)).await
}

fn get_builder(port: u8) -> IPCBuilder<TestProtocolListener> {
    IPCBuilder::new()
        .address(port)
        .timeout(Duration::from_millis(100))
        .on("ping", callback!(handle_ping_event))
        .on("pong", callback!(handle_pong_event))
        .on("create_error", callback!(handle_create_error_event))
        .on("error", callback!(handle_error_event))
        .namespace("test")
        .on("ping", callback!(handle_ping_event))
        .on("pong", callback!(handle_pong_event))
        .on("create_error", callback!(handle_create_error_event))
        .build()
}

async fn handle_ping_event(ctx: &Context, event: Event) -> IPCResult<Response> {
    increment_counter_for_event(ctx, &event).await;
    ctx.emit("pong", EmptyPayload).await?;

    Ok(Response::empty())
}

async fn handle_pong_event(ctx: &Context, event: Event) -> IPCResult<Response> {
    increment_counter_for_event(ctx, &event).await;

    Ok(Response::empty())
}

async fn handle_create_error_event(ctx: &Context, event: Event) -> IPCResult<Response> {
    increment_counter_for_event(ctx, &event).await;

    Err(IPCError::from("Test Error"))
}

async fn handle_error_event(ctx: &Context, event: Event) -> IPCResult<Response> {
    increment_counter_for_event(ctx, &event).await;

    Ok(Response::empty())
}

pub struct EmptyPayload;

impl IntoPayload for EmptyPayload {
    fn into_payload(self, _: &Context) -> IPCResult<Bytes> {
        Ok(Bytes::new())
    }
}