import Foundation

struct Configuration: Codable {
    
    let contentFolder: String

    let trainingIterations: Int
    
    let serverPath: String
    
    let authenticationToken: String
    
    init(at url: URL) throws {
        guard FileManager.default.fileExists(atPath: url.path) else {
            print("[ERROR] No configuration at \(url.absoluteURL.path)")
            throw TrainingError.configurationFileMissing
        }
        let data: Data
        do {
            data = try Data(contentsOf: url)
        } catch {
            print("[ERROR] Failed to load configuration data at \(url.absoluteURL.path): \(error)")
            throw TrainingError.configurationFileUnreadable
        }
        do {
            self = try JSONDecoder().decode(Configuration.self, from: data)
        } catch {
            print("[ERROR] Failed to decode configuration at \(url.absoluteURL.path): \(error)")
            throw TrainingError.configurationFileDecodingFailed
        }
    }
    
    func serverUrl() throws -> URL {
        guard let serverUrl = URL(string: serverPath) else {
            print("[ERROR] Configuration: Invalid server path \(serverPath)")
            throw TrainingError.invalidServerPath
        }
        return serverUrl
    }
}