use backtrace::Backtrace as CrateBacktrace;
use diesel::result::Error as DslError;
#[cfg(not(target_arch = "wasm32"))]
use reqwest::Error as ReqError;
use serde::{Deserialize, Serialize};
use std::fmt;
use thiserror::Error;
use uuid::Uuid;

pub type UResult<T> = std::result::Result<T, UErrorBt>;
pub type ULocalResult<T> = std::result::Result<T, ULocalError>;

#[derive(Error, Debug, Serialize, Deserialize, Clone)]
pub struct UErrorBt {
    pub err: UError,
    pub backtrace: String,
}

impl fmt::Display for UErrorBt {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{}\nBACKTRACE: \n{:?}", self.err, self.backtrace)
    }
}

impl From<UError> for UErrorBt {
    fn from(err: UError) -> UErrorBt {
        UErrorBt {
            err,
            backtrace: format!("{:?}", CrateBacktrace::new()),
        }
    }
}

#[derive(Error, Debug, Serialize, Deserialize, Clone)]
pub enum UError {
    #[error("Runtime error: {0}")]
    Runtime(String),

    #[error("Connection error: {0}. Body: {1}")]
    NetError(String, String),

    #[error("Parse error")]
    ParseError,

    #[error("Job error: {0}")]
    JobError(String),

    #[error("Argument parsing failed: {0}")]
    JobArgsError(String),

    #[error("Job is uncompleted yet")]
    JobUncompleted,

    #[error("Job cannot be ran on this platform. Expected: {0}, got: {1}")]
    InsuitablePlatform(String, String),

    #[error("Job {0} doesn't exist")]
    NoJob(Uuid),

    #[error("Error while processing {0}: {1}")]
    FSError(String, String),

    #[error("Wrong auth token")]
    WrongToken,

    #[error("Panicked: {0}")]
    Panic(String),

    #[error("UI init error: {0}")]
    TUIError(String),
}

impl UError {
    pub fn into_bt(self) -> UErrorBt {
        UErrorBt::from(self)
    }
}

#[cfg(not(target_arch = "wasm32"))]
impl From<ReqError> for UErrorBt {
    fn from(e: ReqError) -> Self {
        UError::from(e).into_bt()
    }
}

#[cfg(not(target_arch = "wasm32"))]
impl From<ReqError> for UError {
    fn from(e: ReqError) -> Self {
        UError::NetError(e.to_string(), String::new())
    }
}

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

    #[error("Error processing {0}")]
    ProcessingError(String),

    #[error(transparent)]
    DBError(#[from] DslError),
}