//! The error type shared by the core modules.

use std::io;

/// Everything a core operation can fail with. The `Display` text is shown to the
/// user as-is, so validation messages are written in Czech like the rest of the UI.
#[derive(Debug, thiserror::Error)]
pub enum CoreError {
    /// Invalid input (bad year, empty title, unknown 3D format, …).
    #[error("{0}")]
    Invalid(String),
    /// The target already exists and the caller asked not to overwrite it.
    #[error("{0}")]
    Exists(String),
    /// Something expected on disk is missing.
    #[error("{0}")]
    NotFound(String),
    /// A remote service (TMDb, ČSFD, Jellyfin) failed.
    #[error("{0}")]
    Remote(String),
    #[error(transparent)]
    Io(#[from] io::Error),
    #[error(transparent)]
    Json(#[from] serde_json::Error),
}

impl CoreError {
    pub fn invalid(msg: impl Into<String>) -> Self {
        Self::Invalid(msg.into())
    }
}

pub type CoreResult<T> = Result<T, CoreError>;