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

pub type SirenResult<T> = Result<T, Error>;

#[derive(Debug, Deserialize, Serialize)]
pub struct Error {
  pub status: u16,
  pub details: String,
}

impl Error {
  pub fn new(error_status_code: u16, error_message: String) -> Self {
    Self {
      status: error_status_code,
      details: error_message,
    }
  }
}

impl fmt::Display for Error {
  fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
    f.write_str(self.details.as_str())
  }
}

impl std::error::Error for Error {
  fn description(&self) -> &str {
    &self.details
  }
}

impl IntoResponse for Error {
  fn into_response(self) -> Response {
    let status = StatusCode::from_u16(self.status).unwrap_or(StatusCode::INTERNAL_SERVER_ERROR);

    // Create a JSON response with the structured error
    let body = Json(serde_json::json!({
        "error": {
            "status": self.status,
            "details": self.details,
        }
    }));

    // Return the response with the proper status and error body
    (status, body).into_response()
  }
}

impl From<std::io::Error> for Error {
  fn from(error: std::io::Error) -> Self {
    Self::new(500, format!("Unknown io error: {}", error))
  }
}

impl From<StatusCode> for Error {
  fn from(status: StatusCode) -> Self {
    Error {
      status: status.as_u16(),
      details: status
        .canonical_reason()
        .unwrap_or("Unknown error")
        .to_string(),
    }
  }
}

impl From<std::string::FromUtf8Error> for Error {
  fn from(error: std::string::FromUtf8Error) -> Self {
    Self::new(500, format!("Unknown from utf8 error: {}", error))
  }
}

impl From<sqlx::Error> for Error {
  fn from(error: sqlx::Error) -> Self {
    match error {
      sqlx::Error::RowNotFound => Error::new(404, "Not found".to_string()),
      sqlx::Error::ColumnIndexOutOfBounds { .. } => Error::new(422, error.to_string()),
      sqlx::Error::ColumnNotFound { .. } => Error::new(422, error.to_string()),
      sqlx::Error::ColumnDecode { .. } => Error::new(422, error.to_string()),
      sqlx::Error::Decode(_) => Error::new(422, error.to_string()),
      sqlx::Error::PoolTimedOut => Error::new(503, error.to_string()),
      sqlx::Error::PoolClosed => Error::new(503, error.to_string()),
      sqlx::Error::Tls(_) => Error::new(500, error.to_string()),
      sqlx::Error::Io(_) => Error::new(500, error.to_string()),
      sqlx::Error::Protocol(_) => Error::new(500, error.to_string()),
      sqlx::Error::Configuration(_) => Error::new(500, error.to_string()),
      sqlx::Error::AnyDriverError(_) => Error::new(500, error.to_string()),
      sqlx::Error::Database(err) => {
        if let Some(code) = err.code() {
          match code.trim() {
            // Unique violation
            "23505" => return Error::new(409, err.to_string()),
            _ => (),
          }
        }
        Error::new(500, err.to_string())
      }
      sqlx::Error::Migrate(_) => Error::new(500, error.to_string()),
      sqlx::Error::TypeNotFound { type_name } => {
        Error::new(500, format!("Type not found: {}", type_name))
      }
      sqlx::Error::WorkerCrashed => Error::new(500, error.to_string()),
      _ => Error::new(500, error.to_string()),
    }
  }
}

impl From<sqlx::migrate::MigrateError> for Error {
  fn from(error: sqlx::migrate::MigrateError) -> Self {
    Error::new(500, error.to_string())
  }
}

impl From<reqwest::Error> for Error {
  fn from(error: reqwest::Error) -> Self {
    Self::new(500, format!("Unknown reqwest error: {}", error))
  }
}

impl From<serde_json::Error> for Error {
  fn from(error: serde_json::Error) -> Self {
    Self::new(500, format!("Unknown serde_json error: {}", error))
  }
}

impl From<serenity::Error> for Error {
  fn from(error: serenity::Error) -> Self {
    Self::new(500, format!("Unknown serenity error: {}", error))
  }
}

impl From<redis::RedisError> for Error {
  fn from(error: redis::RedisError) -> Self {
    Self::new(500, format!("Unknown redis error: {}", error))
  }
}

impl From<uuid::Error> for Error {
  fn from(error: uuid::Error) -> Self {
    Self::new(500, format!("Unknown uuid error: {}", error))
  }
}

impl From<std::env::VarError> for Error {
  fn from(error: std::env::VarError) -> Self {
    Self::new(500, format!("Unknown env error: {}", error))
  }
}

impl From<songbird::error::JoinError> for Error {
  fn from(error: songbird::error::JoinError) -> Self {
    Self::new(500, format!("Unable to join channel: {}", error))
  }
}