use axum::{
    http::StatusCode,
    response::{IntoResponse, Response},
};
use derive_more::From;

pub type Result<T> = core::result::Result<T, Error>;

#[derive(Debug, From)]
pub enum Error {
    ConfigNotFound,
    ConfigHomeNotFound,

    #[from]
    Io(std::io::Error),

    #[from]
    EnvVar(std::env::VarError),

    #[from]
    Askama(askama::Error),

    #[from]
    SerdeError(serde_json::Error),

    #[from]
    TomlDeError(toml::de::Error),

    #[from]
    TomlSerError(toml::ser::Error),
}

impl core::fmt::Display for Error {
    fn fmt(&self, fmt: &mut core::fmt::Formatter) -> core::result::Result<(), std::fmt::Error> {
        match self {
            Error::ConfigNotFound => write!(
                fmt,
                "Config file can't be found at ~/.config/sbm-rs/config.toml"
            ),
            Error::ConfigHomeNotFound => write!(fmt, "Config home can't be found"),
            Error::Io(e) => write!(fmt, "{e}"),
            Error::EnvVar(e) => write!(fmt, "Environment variable error: {e}"),
            Error::Askama(e) => write!(fmt, "Askama error: {e}"),
            Error::SerdeError(e) => write!(fmt, "Serde error: {e}"),
            Error::TomlDeError(e) => write!(fmt, "TOML deserialization error: {e}"),
            Error::TomlSerError(e) => write!(fmt, "TOML serialization error: {e}"),
        }
    }
}

impl IntoResponse for Error {
    fn into_response(self) -> Response {
        let (status, error_message) = match self {
            Error::ConfigNotFound => (
                StatusCode::INTERNAL_SERVER_ERROR,
                format!("Config file can't be found at ~/.config/sbm-rs/config.toml"),
            ),
            Error::ConfigHomeNotFound => (
                StatusCode::INTERNAL_SERVER_ERROR,
                format!("Config home can't be found"),
            ),
            Error::Io(ref e) => (StatusCode::INTERNAL_SERVER_ERROR, format!("{e}")),
            Error::EnvVar(ref e) => (
                StatusCode::INTERNAL_SERVER_ERROR,
                format!("Environment variable error: {e}"),
            ),
            Error::Askama(ref e) => (
                StatusCode::INTERNAL_SERVER_ERROR,
                format!("Askama error: {e}"),
            ),
            Error::SerdeError(ref e) => (
                StatusCode::INTERNAL_SERVER_ERROR,
                format!("Serde error: {e}"),
            ),
            Error::TomlDeError(ref e) => (
                StatusCode::INTERNAL_SERVER_ERROR,
                format!("TOML deserialization error: {e}"),
            ),
            Error::TomlSerError(ref e) => (
                StatusCode::INTERNAL_SERVER_ERROR,
                format!("TOML serialization error: {e}"),
            ),
        };

        println!("{} {}", &status, &error_message);
        (status, error_message).into_response()
    }
}