import Foundation
import Testing
@testable import PediFoods

/// `AppContentCache.shared` is a true singleton with no injectable
/// instance; `invalidate()` with no prefix wipes every key regardless of
/// which test wrote it. Serialized so tests can't stomp on each other.
@Suite(.serialized)
struct AppContentCacheTests {
    @Test("value(for:) returns what was just set")
    func setThenGetRoundTrips() {
        let key = "test.\(UUID().uuidString)"
        AppContentCache.shared.set("hello", for: key, ttl: 60)
        #expect(AppContentCache.shared.value(for: key, as: String.self) == "hello")
    }

    @Test("value(for:) returns nil once the TTL has elapsed")
    func expiresAfterTTL() {
        let key = "test.\(UUID().uuidString)"
        AppContentCache.shared.set("hello", for: key, ttl: -1) // already expired
        #expect(AppContentCache.shared.value(for: key, as: String.self) == nil)
    }

    @Test("value(for:) returns nil for a key that was never set")
    func missingKeyReturnsNil() {
        let key = "test.\(UUID().uuidString)"
        #expect(AppContentCache.shared.value(for: key, as: String.self) == nil)
    }

    @Test("invalidate(prefix:) only removes keys matching that prefix")
    func invalidateWithPrefixIsScoped() {
        let prefix = "test.\(UUID().uuidString)."
        AppContentCache.shared.set("a", for: "\(prefix)a", ttl: 60)
        AppContentCache.shared.set("b", for: "\(prefix)b", ttl: 60)
        AppContentCache.shared.set("unrelated", for: "unrelated.\(UUID().uuidString)", ttl: 60)

        AppContentCache.shared.invalidate(prefix: prefix)

        #expect(AppContentCache.shared.value(for: "\(prefix)a", as: String.self) == nil)
        #expect(AppContentCache.shared.value(for: "\(prefix)b", as: String.self) == nil)
    }

    @Test("invalidate() with no prefix clears every entry")
    func invalidateWithNoPrefixClearsEverything() {
        let key = "test.\(UUID().uuidString)"
        AppContentCache.shared.set("hello", for: key, ttl: 60)
        AppContentCache.shared.invalidate()
        #expect(AppContentCache.shared.value(for: key, as: String.self) == nil)
    }
}