use axum::http::StatusCode;
use axum::response::{IntoResponse, Response};
use export::data::{AppResponseData, NoData};
use thiserror::Error;

pub type IssueResult<T> = Result<T, IssueError>;

#[derive(Debug, Error)]
pub enum IssueError {
    #[error("bad request: {0}")]
    BadRequest(String),
    #[error("unauthorized: {0}")]
    Unauthorized(String),
    #[error("forbidden: {0}")]
    Forbidden(String),
    #[error("not found: {0}")]
    NotFound(String),
    #[error("conflict: {0}")]
    Conflict(String),
    #[error("unprocessable: {0}")]
    Unprocessable(String),
    #[error("rate limited: {0}")]
    RateLimited(String),
    #[error("internal: {0}")]
    Internal(String),

    #[error("database error: {0}")]
    Sqlx(#[from] db::conn::SqlxError),
    #[error("uuid: {0}")]
    Uuid(#[from] uuid::Error),
}

impl From<axum::extract::rejection::JsonRejection> for IssueError {
    fn from(re: axum::extract::rejection::JsonRejection) -> Self {
        IssueError::BadRequest(re.body_text())
    }
}

impl From<axum::extract::rejection::PathRejection> for IssueError {
    fn from(re: axum::extract::rejection::PathRejection) -> Self {
        IssueError::BadRequest(re.body_text())
    }
}

impl From<axum::extract::rejection::QueryRejection> for IssueError {
    fn from(re: axum::extract::rejection::QueryRejection) -> Self {
        IssueError::BadRequest(re.body_text())
    }
}

impl IssueError {
    fn status(&self) -> StatusCode {
        match self {
            IssueError::BadRequest(_) => StatusCode::BAD_REQUEST,
            IssueError::Unauthorized(_) => StatusCode::UNAUTHORIZED,
            IssueError::Forbidden(_) => StatusCode::FORBIDDEN,
            IssueError::NotFound(_) => StatusCode::NOT_FOUND,
            IssueError::Conflict(_) => StatusCode::CONFLICT,
            IssueError::Unprocessable(_) => StatusCode::UNPROCESSABLE_ENTITY,
            IssueError::RateLimited(_) => StatusCode::TOO_MANY_REQUESTS,
            IssueError::Internal(_) | IssueError::Sqlx(_) | IssueError::Uuid(_) => {
                StatusCode::INTERNAL_SERVER_ERROR
            }
        }
    }

    fn is_user_facing(&self) -> bool {
        matches!(
            self,
            IssueError::BadRequest(_)
                | IssueError::Unauthorized(_)
                | IssueError::Forbidden(_)
                | IssueError::NotFound(_)
                | IssueError::Conflict(_)
                | IssueError::Unprocessable(_)
                | IssueError::RateLimited(_)
        )
    }

    pub fn error_kind(&self) -> &'static str {
        match self {
            IssueError::BadRequest(_) => "bad_request",
            IssueError::Unauthorized(_) => "unauthorized",
            IssueError::Forbidden(_) => "forbidden",
            IssueError::NotFound(_) => "not_found",
            IssueError::Conflict(_) => "conflict",
            IssueError::Unprocessable(_) => "unprocessable",
            IssueError::RateLimited(_) => "rate_limited",
            IssueError::Internal(_) => "internal_other",
            IssueError::Sqlx(_) => "internal_db",
            IssueError::Uuid(_) => "internal_uuid",
        }
    }
}

impl IntoResponse for IssueError {
    fn into_response(self) -> Response {
        let status = self.status();
        let msg = if self.is_user_facing() {
            self.to_string()
        } else {
            tracing::error!(error = %self, "issues internal error");
            "internal error".to_string()
        };
        AppResponseData::<NoData>::err_plain(status.as_u16() as i32, msg).into_response()
    }
}