use mlua::UserData;

use tokio::io::{self};

#[derive(Debug, thiserror::Error)]
pub enum Error {
    #[error("error parsing request: {0}")]
    Parse(#[from] httparse::Error),

    #[error("io error: {0}")]
    Io(#[from] io::Error),

    #[error("invalid method: {0}")]
    Method(#[from] http::method::InvalidMethod),

    #[error("invalid request: {0}")]
    Request(#[from] http::Error),

    #[error("unsupported version")]
    Version,
}

#[derive(Debug, Clone)]
pub struct Request<T>(http::Request<T>);

impl<T> Request<T> {
    pub fn inner(&self) -> &http::Request<T> {
        &self.0
    }

    pub fn new(request: http::Request<T>) -> Self {
        Self(request)
    }
}

impl<T> UserData for Request<T> {
    fn add_fields<F: mlua::UserDataFields<Self>>(fields: &mut F) {
        fields.add_field_method_get("method", |_, this| {
            Ok(this.inner().method().as_str().to_string())
        });

        fields.add_field_method_get("path", |_, this| Ok(this.inner().uri().path().to_string()));

        fields.add_field_method_get("headers", |lua, this| {
            let table = lua.create_table()?;

            for (key, value) in this.inner().headers() {
                table.set(key.as_str(), value.as_bytes())?;
            }

            Ok(table)
        })
    }
}