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use wasm_bindgen::{JsCast, JsValue};

/// All possible Error variants that might be encountered while working with a Worker.
#[derive(Debug)]
#[non_exhaustive]
pub enum Error {
    BadEncoding,
    BodyUsed,
    Json((String, u16)),
    JsError(String),
    Internal(JsValue),
    BindingError(String),
    RouteInsertError(matchit::InsertError),
    RouteNoDataError,
    RustError(String),
    SerdeJsonError(serde_json::Error),
    SerdeWasmBindgenError(serde_wasm_bindgen::Error),
}

impl From<worker_kv::KvError> for Error {
    fn from(e: worker_kv::KvError) -> Self {
        let val: JsValue = e.into();
        val.into()
    }
}

impl From<url::ParseError> for Error {
    fn from(e: url::ParseError) -> Self {
        Self::RustError(e.to_string())
    }
}

impl std::fmt::Display for Error {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Error::BadEncoding => write!(f, "content-type mismatch"),
            Error::BodyUsed => write!(f, "body has already been read"),
            Error::Json((msg, status)) => write!(f, "{} (status: {})", msg, status),
            Error::JsError(s) | Error::RustError(s) => {
                write!(f, "{}", s)
            }
            Error::Internal(_) => write!(f, "unrecognized JavaScript object"),
            Error::BindingError(name) => write!(f, "no binding found for `{}`", name),
            Error::RouteInsertError(e) => write!(f, "failed to insert route: {}", e),
            Error::RouteNoDataError => write!(f, "route has no corresponding shared data"),
            Error::SerdeJsonError(e) => write!(f, "Serde Error: {}", e),
            Error::SerdeWasmBindgenError(e) => write!(f, "Serde Error: {}", e),
        }
    }
}

impl std::error::Error for Error {}

impl From<JsValue> for Error {
    fn from(v: JsValue) -> Self {
        match v
            .as_string()
            .or_else(|| v.dyn_ref::<js_sys::Error>().map(|e| e.to_string().into()))
        {
            Some(s) => Self::JsError(s),
            None => Self::Internal(v),
        }
    }
}

impl From<Error> for JsValue {
    fn from(e: Error) -> Self {
        JsValue::from_str(&e.to_string())
    }
}

impl From<&str> for Error {
    fn from(a: &str) -> Self {
        Error::RustError(a.to_string())
    }
}

impl From<String> for Error {
    fn from(a: String) -> Self {
        Error::RustError(a)
    }
}

impl From<matchit::InsertError> for Error {
    fn from(e: matchit::InsertError) -> Self {
        Error::RouteInsertError(e)
    }
}

impl From<serde_json::Error> for Error {
    fn from(e: serde_json::Error) -> Self {
        Error::SerdeJsonError(e)
    }
}

impl From<serde_wasm_bindgen::Error> for Error {
    fn from(e: serde_wasm_bindgen::Error) -> Self {
        Error::SerdeWasmBindgenError(e)
    }
}