use axum::{http::StatusCode, response::{IntoResponse, Response}, Json};
use serde_json::json;
use thiserror::Error;

#[derive(Debug, Error)]
pub enum AppError {
    #[error("database error: {0}")]
    Db(#[from] sqlx::Error),
    #[error("not found")]
    NotFound,
    #[error("conflict: {0}")]
    Conflict(String),
    #[error("unauthorized")]
    Unauthorized,
    #[error("bad request: {0}")]
    BadRequest(String),
}

impl IntoResponse for AppError {
    fn into_response(self) -> Response {
        let (status, msg) = match &self {
            AppError::Db(e) => {
                tracing::error!(error = %e, "database error");
                (StatusCode::INTERNAL_SERVER_ERROR, "internal error".into())
            }
            AppError::NotFound => (StatusCode::NOT_FOUND, "not found".into()),
            AppError::Conflict(m) => (StatusCode::CONFLICT, m.clone()),
            AppError::Unauthorized => (StatusCode::UNAUTHORIZED, "unauthorized".into()),
            AppError::BadRequest(m) => (StatusCode::BAD_REQUEST, m.clone()),
        };
        (status, Json(json!({"error": msg}))).into_response()
    }
}