use axum::{
    http::StatusCode,
    response::{IntoResponse, Response},
    Json,
};
use serde::Serialize;

#[derive(Debug)]
pub struct ApiError {
    pub status: StatusCode,
    pub message: String,
}

#[derive(Serialize)]
struct ErrorBody<'a> {
    error: &'a str,
}

impl ApiError {
    pub fn bad_request(message: impl Into<String>) -> Self {
        Self {
            status: StatusCode::BAD_REQUEST,
            message: message.into(),
        }
    }

    pub fn unauthorized(message: impl Into<String>) -> Self {
        Self {
            status: StatusCode::UNAUTHORIZED,
            message: message.into(),
        }
    }

    pub fn forbidden(message: impl Into<String>) -> Self {
        Self {
            status: StatusCode::FORBIDDEN,
            message: message.into(),
        }
    }

    pub fn unprocessable_entity(message: impl Into<String>) -> Self {
        Self {
            status: StatusCode::UNPROCESSABLE_ENTITY,
            message: message.into(),
        }
    }

    pub fn not_found(message: impl Into<String>) -> Self {
        Self {
            status: StatusCode::NOT_FOUND,
            message: message.into(),
        }
    }

    pub fn internal(message: impl Into<String>) -> Self {
        Self {
            status: StatusCode::INTERNAL_SERVER_ERROR,
            message: message.into(),
        }
    }
}

impl IntoResponse for ApiError {
    fn into_response(self) -> Response {
        (
            self.status,
            Json(ErrorBody {
                error: &self.message,
            }),
        )
            .into_response()
    }
}

impl From<sqlx::Error> for ApiError {
    fn from(err: sqlx::Error) -> Self {
        Self::internal(format!("database error: {err}"))
    }
}

impl From<std::io::Error> for ApiError {
    fn from(err: std::io::Error) -> Self {
        Self::internal(format!("IO error: {err}"))
    }
}

impl From<reqwest::Error> for ApiError {
    fn from(err: reqwest::Error) -> Self {
        Self::internal(format!("HTTP client error: {err}"))
    }
}