import Foundation

public enum SongProjectUpdateScope: String, CaseIterable, Codable, Equatable, Hashable, Sendable {
    case duration
    case genres
    case instruments
    case vocals
    case languages
    case lyrics
    case structure
    case arrangement
    case musicalParameters
    case emotionalArc
    case productionDirections
    case sunoOutput
}

public struct SongProjectUserLocks: Codable, Equatable, Sendable {
    public var scopes: [SongProjectUpdateScope]

    public init(scopes: [SongProjectUpdateScope] = []) {
        self.scopes = Self.uniqueScopes(scopes)
    }

    public func contains(_ scope: SongProjectUpdateScope) -> Bool {
        scopes.contains(scope)
    }

    public mutating func insert(_ scope: SongProjectUpdateScope) {
        guard !contains(scope) else { return }
        scopes.append(scope)
    }

    public mutating func remove(_ scope: SongProjectUpdateScope) {
        scopes.removeAll { $0 == scope }
    }

    private static func uniqueScopes(_ scopes: [SongProjectUpdateScope]) -> [SongProjectUpdateScope] {
        var seen = Set<SongProjectUpdateScope>()
        return scopes.filter { seen.insert($0).inserted }
    }
}