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use crate::reply::Event;
use crate::{bail, Error};
use serde_derive::Serialize;
use serde_json::from_slice;
use std::convert::TryFrom;

#[derive(Debug, Serialize)]
#[serde(rename_all = "snake_case")]
pub enum EventType {
    Workspace,
    Mode,
    Window,
    #[serde(rename = "barconfig_update")]
    BarConfigUpdate,
    Binding,
    Shutdown,
    Tick,
    BarStateUpdate,
    Input,
}

impl TryFrom<(u32, Vec<u8>)> for Event {
    type Error = Error;

    fn try_from((event_type, payload): (u32, Vec<u8>)) -> Result<Self, Self::Error> {
        Ok(
            // strip the highest order bit indicating it's an event
            match (event_type << 1) >> 1 {
                0 => Event::Workspace(from_slice(&payload)?),
                2 => Event::Mode(from_slice(&payload)?),
                3 => Event::Window(from_slice(&payload)?),
                4 => Event::BarConfigUpdate(from_slice(&payload)?),
                5 => Event::Binding(from_slice(&payload)?),
                6 => Event::Shutdown(from_slice(&payload)?),
                7 => Event::Tick(from_slice(&payload)?),
                20 => Event::BarStateUpdate(from_slice(&payload)?),
                21 => Event::Input(from_slice(&payload)?),
                _ => bail!("received unimplemented event '{}'", (event_type << 1) >> 1),
            },
        )
    }
}