import Foundation
@testable import Closer

/// In-memory fake for `CoupleKeyStoreProtocol` used in unit tests.
///
/// The iOS Keychain requires a device entitlement / simulator environment and
/// cannot be exercised in a headless Linux Swift build. This fake validates the
/// store/load/delete contract at the business-logic layer.
public final class InMemoryCoupleKeyStore: @unchecked Sendable, CoupleKeyStoreProtocol {
    private var storage: [String: Data] = [:]
    private let lock = NSLock()

    public init() {}

    public func storeCoupleKey(_ key: CoupleKeyMaterial, for coupleId: String) throws {
        lock.lock()
        defer { lock.unlock() }
        storage[coupleId] = key.rawKey.bytes
    }

    public func loadCoupleKey(for coupleId: String) throws -> CoupleKeyMaterial? {
        lock.lock()
        defer { lock.unlock() }
        guard let bytes = storage[coupleId] else { return nil }
        return CoupleKeyMaterial(rawBytes: bytes)
    }

    public func deleteCoupleKey(for coupleId: String) throws {
        lock.lock()
        defer { lock.unlock() }
        storage.removeValue(forKey: coupleId)
    }
}