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

#[derive(Debug, Error)]
pub enum AppError {
    #[error("not found: {0}")]
    NotFound(String),

    #[error("bad request: {0}")]
    BadRequest(String),

    #[error("conflict: {0}")]
    Conflict(String),

    #[error("database error: {0}")]
    Database(#[from] sqlx::Error),

    #[error("internal error: {0}")]
    Internal(#[from] anyhow::Error),

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

    #[error("json error: {0}")]
    Json(#[from] serde_json::Error),
}

impl IntoResponse for AppError {
    fn into_response(self) -> Response {
        let (status, message) = match &self {
            AppError::NotFound(msg) => (StatusCode::NOT_FOUND, msg.clone()),
            AppError::BadRequest(msg) => (StatusCode::BAD_REQUEST, msg.clone()),
            AppError::Conflict(msg) => (StatusCode::CONFLICT, msg.clone()),
            AppError::Database(e) => {
                tracing::error!("Database error: {e}");
                (StatusCode::INTERNAL_SERVER_ERROR, "database error".into())
            }
            AppError::Internal(e) => {
                tracing::error!("Internal error: {e}");
                (
                    StatusCode::INTERNAL_SERVER_ERROR,
                    "internal server error".into(),
                )
            }
            AppError::Io(e) => {
                tracing::error!("IO error: {e}");
                (StatusCode::INTERNAL_SERVER_ERROR, "io error".into())
            }
            AppError::Json(e) => (StatusCode::BAD_REQUEST, format!("json parse error: {e}")),
        };

        let body = Json(json!({ "error": message }));
        (status, body).into_response()
    }
}

pub type AppResult<T> = Result<T, AppError>;