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//! Errors raised by the builder DSL

use anomaly::BoxError;
use anomaly::Context;
use tendermint::block::Height;
use tendermint::Hash;
use thiserror::Error;

use crate::components::io::IoError;

/// An error raised by the builder
pub type Error = anomaly::Error<Kind>;

/// The various error kinds raised by the builder
#[derive(Debug, Clone, Error, PartialEq)]
pub enum Kind {
    /// I/O error
    #[error("I/O error: {0}")]
    Io(#[from] IoError),

    /// Height mismatch
    #[error("height mismatch: given = {given}, found = {found}")]
    HeightMismatch {
        /// Height of trusted header
        given: Height,
        /// Height of fetched header
        found: Height,
    },

    /// Hash mismatch
    #[error("hash mismatch: given = {given}, found = {found}")]
    HashMismatch {
        /// Hash of trusted header
        given: Hash,
        /// hash of fetched header
        found: Hash,
    },

    /// Invalid light block
    #[error("invalid light block")]
    InvalidLightBlock,

    /// No trusted state as found in the store
    #[error("no trusted state in store")]
    NoTrustedStateInStore,

    /// An empty witness list was given
    #[error("empty witness list")]
    EmptyWitnessList,
}

impl Kind {
    /// Add additional context (i.e. include a source error and capture a backtrace).
    /// You can convert the resulting `Context` into an `Error` by calling `.into()`.
    pub fn context(self, source: impl Into<BoxError>) -> Context<Self> {
        Context::new(self, Some(source.into()))
    }
}