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extern crate rmp_serde as rmps;
use rmps::{Deserializer, Serializer};
use serde::{Deserialize, Serialize};
use std::io::Cursor;

#[cfg(feature = "guest")]
extern crate wapc_guest as guest;
#[cfg(feature = "guest")]
use crate::{set_binding, CURRENT_BINDING};
#[cfg(feature = "guest")]
use guest::prelude::*;

#[cfg(feature = "guest")]
pub struct Host {}

#[cfg(feature = "guest")]
impl Default for Host {
    fn default() -> Self {
        set_binding("default");
        Host {}
    }
}

/// Creates a named host binding
#[cfg(feature = "guest")]
pub fn host(binding: &str) -> Host {
    set_binding(binding);
    Host {}
}

/// Creates the default host binding
#[cfg(feature = "guest")]
pub fn default() -> Host {
    Host::default()
}

#[cfg(feature = "guest")]
impl Host {
    pub(crate) fn _write_log(
        &self,
        target: String,
        level: String,
        text: String,
    ) -> HandlerResult<()> {
        let input_args = WriteLogArgs {
            target,
            level,
            text,
        };
        host_call(
            &CURRENT_BINDING.read().unwrap(),
            "wasmcloud:logging",
            "WriteLog",
            &serialize(input_args)?,
        )
        .map(|_vec| ())
        .map_err(|e| e.into())
    }
}

#[derive(Debug, PartialEq, Deserialize, Serialize, Default, Clone)]
pub struct WriteLogArgs {
    #[serde(rename = "target")]
    pub target: String,
    #[serde(rename = "level")]
    pub level: String,
    #[serde(rename = "text")]
    pub text: String,
}

/// The standard function for serializing codec structs into a format that can be
/// used for message exchange between actor and host. Use of any other function to
/// serialize could result in breaking incompatibilities.
pub fn serialize<T>(
    item: T,
) -> ::std::result::Result<Vec<u8>, Box<dyn std::error::Error + Send + Sync>>
where
    T: Serialize,
{
    let mut buf = Vec::new();
    item.serialize(&mut Serializer::new(&mut buf).with_struct_map())?;
    Ok(buf)
}

/// The standard function for de-serializing codec structs from a format suitable
/// for message exchange between actor and host. Use of any other function to
/// deserialize could result in breaking incompatibilities.
pub fn deserialize<'de, T: Deserialize<'de>>(
    buf: &[u8],
) -> ::std::result::Result<T, Box<dyn std::error::Error + Send + Sync>> {
    let mut de = Deserializer::new(Cursor::new(buf));
    match Deserialize::deserialize(&mut de) {
        Ok(t) => Ok(t),
        Err(e) => Err(format!("Failed to de-serialize: {}", e).into()),
    }
}