import Foundation

/// One screen's loading lifecycle. `empty` is a first-class state, not a
/// failure — exit 3 lands here, and so does a list with nothing in it.
nonisolated enum LoadState<Value: Sendable>: Sendable {
    case loading
    case loaded(Value)
    case empty(String)
    case failed(String)

    var value: Value? {
        if case .loaded(let value) = self { return value }
        return nil
    }
}

extension LoadState {
    /// Map any thrown error onto the state a screen should show.
    static func from(_ error: any Error) -> LoadState {
        guard let error = error as? GitbayError else {
            return .failed(GitbayError.transport(error).userFacingMessage)
        }
        return error.isEmptyState ? .empty(error.userFacingMessage) : .failed(error.userFacingMessage)
    }
}