/*
 * Copyright (C) 2022  Aravinth Manivannan <realaravinth@batsense.net>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

use std::convert::From;

use argon2_creds::errors::CredsError;
//use db_core::errors::DBError;
use actix_web::http;
use actix_web::http::StatusCode;
use actix_web::HttpResponse;
use actix_web::HttpResponseBuilder;
use actix_web::ResponseError;
use derive_more::{Display, Error};
use serde::{Deserialize, Serialize};
use tokio::sync::oneshot::error::RecvError;
use url::ParseError;

//#[derive(Debug, Display, Error)]
//pub struct DBErrorWrapper(DBError);
//
//impl std::cmp::PartialEq for DBErrorWrapper {
//    fn eq(&self, other: &Self) -> bool {
//        format!("{}", self.0) == format!("{}", other.0)
//    }
//}
//
#[derive(Debug, Display, PartialEq, Eq, Error)]
#[cfg(not(tarpaulin_include))]
#[allow(dead_code)]
pub enum ServiceError {
    #[display(fmt = "unauthorized")]
    Unauthorized,

    #[display(fmt = "internal server error")]
    InternalServerError,

    #[display(
        fmt = "This server is is closed for registration. Contact admin if this is unexpecter"
    )]
    ClosedForRegistration,

    #[display(fmt = "The value you entered for email is not an email")] //405j
    NotAnEmail,
    #[display(fmt = "The value you entered for URL is not a URL")] //405j
    NotAUrl,

    #[display(fmt = "Wrong password")]
    WrongPassword,

    /// when the value passed contains profainity
    #[display(fmt = "Can't allow profanity in usernames")]
    ProfainityError,
    /// when the value passed contains blacklisted words
    /// see [blacklist](https://github.com/shuttlecraft/The-Big-Username-Blacklist)
    #[display(fmt = "Username contains blacklisted words")]
    BlacklistError,
    /// when the value passed contains characters not present
    /// in [UsernameCaseMapped](https://tools.ietf.org/html/rfc8265#page-7)
    /// profile
    #[display(fmt = "username_case_mapped violation")]
    UsernameCaseMappedError,

    #[display(fmt = "Passsword too short")]
    PasswordTooShort,
    #[display(fmt = "Username too long")]
    PasswordTooLong,
    #[display(fmt = "Passwords don't match")]
    PasswordsDontMatch,

    /// when the a username is already taken
    #[display(fmt = "Username not available")]
    UsernameTaken,

    /// email is already taken
    #[display(fmt = "Email not available")]
    EmailTaken,
    //    #[display(fmt = "{}", _0)]
    //    DBError(DBErrorWrapper),
}

#[derive(Serialize, Deserialize)]
#[cfg(not(tarpaulin_include))]
pub struct ErrorToResponse {
    pub error: String,
}

#[cfg(not(tarpaulin_include))]
impl ResponseError for ServiceError {
    #[cfg(not(tarpaulin_include))]
    fn error_response(&self) -> HttpResponse {
        HttpResponseBuilder::new(self.status_code())
            .append_header((
                http::header::CONTENT_TYPE,
                "application/json; charset=UTF-8",
            ))
            .body(
                serde_json::to_string(&ErrorToResponse {
                    error: self.to_string(),
                })
                .unwrap(),
            )
    }

    #[cfg(not(tarpaulin_include))]
    fn status_code(&self) -> StatusCode {
        match self {
            ServiceError::ClosedForRegistration => StatusCode::FORBIDDEN,
            ServiceError::InternalServerError => StatusCode::INTERNAL_SERVER_ERROR,
            ServiceError::NotAUrl => StatusCode::BAD_REQUEST,
            ServiceError::NotAnEmail => StatusCode::BAD_REQUEST,
            ServiceError::WrongPassword => StatusCode::UNAUTHORIZED,
            ServiceError::Unauthorized => StatusCode::UNAUTHORIZED,

            ServiceError::ProfainityError => StatusCode::BAD_REQUEST,
            ServiceError::BlacklistError => StatusCode::BAD_REQUEST,
            ServiceError::UsernameCaseMappedError => StatusCode::BAD_REQUEST,

            ServiceError::PasswordTooShort => StatusCode::BAD_REQUEST,
            ServiceError::PasswordTooLong => StatusCode::BAD_REQUEST,
            ServiceError::PasswordsDontMatch => StatusCode::BAD_REQUEST,

            ServiceError::UsernameTaken => StatusCode::BAD_REQUEST,
            ServiceError::EmailTaken => StatusCode::BAD_REQUEST,
            //            ServiceError::DBError(_) => StatusCode::INTERNAL_SERVER_ERROR,
        }
    }
}

impl From<CredsError> for ServiceError {
    #[cfg(not(tarpaulin_include))]
    fn from(e: CredsError) -> ServiceError {
        match e {
            CredsError::UsernameCaseMappedError => ServiceError::UsernameCaseMappedError,
            CredsError::ProfainityError => ServiceError::ProfainityError,
            CredsError::BlacklistError => ServiceError::BlacklistError,
            CredsError::NotAnEmail => ServiceError::NotAnEmail,
            CredsError::Argon2Error(_) => ServiceError::InternalServerError,
            CredsError::PasswordTooLong => ServiceError::PasswordTooLong,
            CredsError::PasswordTooShort => ServiceError::PasswordTooShort,
        }
    }
}

//impl From<DBError> for ServiceError {
//    #[cfg(not(tarpaulin_include))]
//    fn from(e: DBError) -> ServiceError {
//        println!("from conversin: {}", e);
//        match e {
//            DBError::UsernameTaken => ServiceError::UsernameTaken,
//            DBError::SecretTaken => ServiceError::InternalServerError,
//            DBError::EmailTaken => ServiceError::EmailTaken,
//            DBError::AccountNotFound => ServiceError::AccountNotFound,
//            _ => ServiceError::DBError(DBErrorWrapper(e)),
//        }
//    }
//}

impl From<ParseError> for ServiceError {
    #[cfg(not(tarpaulin_include))]
    fn from(_: ParseError) -> ServiceError {
        ServiceError::NotAUrl
    }
}

#[cfg(not(tarpaulin_include))]
impl From<RecvError> for ServiceError {
    #[cfg(not(tarpaulin_include))]
    fn from(e: RecvError) -> Self {
        log::error!("{:?}", e);
        ServiceError::InternalServerError
    }
}

#[cfg(not(tarpaulin_include))]
pub type ServiceResult<V> = std::result::Result<V, ServiceError>;