import Foundation
import Testing
@testable import ManaCore

@Suite("AuthClient Guest-Mode + Resilience")
@MainActor
struct AuthClientGuestAndResilienceTests {
    // MARK: - enterGuestMode / currentGuestId

    @Test("enterGuestMode aus signedOut erzeugt UUID und setzt .guest")
    func enterGuestModeFromSignedOut() throws {
        let mocked = makeMockedAuth()
        mocked.auth.bootstrap()
        #expect(mocked.auth.status == .signedOut)

        let id = try mocked.auth.enterGuestMode()
        #expect(!id.isEmpty)
        #expect(mocked.auth.status == .guest(id: id))
        #expect(mocked.auth.currentGuestId() == id)
    }

    @Test("enterGuestMode ist idempotent")
    func enterGuestModeIdempotent() throws {
        let mocked = makeMockedAuth()
        let first = try mocked.auth.enterGuestMode()
        let second = try mocked.auth.enterGuestMode()
        #expect(first == second)
        #expect(mocked.auth.status == .guest(id: first))
    }

    @Test("enterGuestMode stört aktive Session nicht")
    func enterGuestModeKeepsSignedIn() throws {
        let mocked = makeMockedAuth()
        try mocked.auth.persistSession(email: "u@x.de", accessToken: "a", refreshToken: "r")
        #expect(mocked.auth.status == .signedIn(email: "u@x.de"))

        let id = try mocked.auth.enterGuestMode()
        #expect(mocked.auth.status == .signedIn(email: "u@x.de"))
        #expect(mocked.auth.currentGuestId() == id)
    }

    @Test("clearGuestId aus .guest fällt auf .signedOut")
    func clearGuestIdFromGuest() throws {
        let mocked = makeMockedAuth()
        _ = try mocked.auth.enterGuestMode()
        mocked.auth.clearGuestId()
        #expect(mocked.auth.status == .signedOut)
        #expect(mocked.auth.currentGuestId() == nil)
    }

    @Test("clearGuestId aus .signedIn behält Status")
    func clearGuestIdKeepsSignedIn() throws {
        let mocked = makeMockedAuth()
        _ = try mocked.auth.enterGuestMode()
        try mocked.auth.persistSession(email: "u@x.de", accessToken: "a", refreshToken: "r")
        mocked.auth.clearGuestId()
        #expect(mocked.auth.status == .signedIn(email: "u@x.de"))
        #expect(mocked.auth.currentGuestId() == nil)
    }

    // MARK: - bootstrap

    @Test("bootstrap erkennt nur-Guest-Keychain als .guest")
    func bootstrapDetectsGuest() throws {
        let mocked = makeMockedAuth()
        _ = try mocked.auth.enterGuestMode()
        mocked.auth.bootstrap()
        if case let .guest(id) = mocked.auth.status {
            #expect(!id.isEmpty)
        } else {
            Issue.record("Expected .guest after bootstrap, got \(mocked.auth.status)")
        }
    }

    @Test("bootstrap priorisiert Session über Guest")
    func bootstrapPrioritisesSession() throws {
        let mocked = makeMockedAuth()
        _ = try mocked.auth.enterGuestMode()
        try mocked.auth.persistSession(email: "u@x.de", accessToken: "a", refreshToken: "r")
        mocked.auth.bootstrap()
        #expect(mocked.auth.status == .signedIn(email: "u@x.de"))
    }

    // MARK: - signOut(keepGuestMode:)

    @Test("signOut Default löscht alles inkl. Guest-ID")
    func signOutDefaultClearsGuest() async throws {
        let mocked = makeMockedAuth()
        _ = try mocked.auth.enterGuestMode()
        try mocked.auth.persistSession(email: "u@x.de", accessToken: "a", refreshToken: "r")
        mocked.setHandler { _ in (200, Data()) }

        await mocked.auth.signOut()
        #expect(mocked.auth.status == .signedOut)
        #expect(mocked.auth.currentGuestId() == nil)
    }

    @Test("signOut(keepGuestMode: true) behält existierende Guest-ID")
    func signOutKeepsExistingGuest() async throws {
        let mocked = makeMockedAuth()
        let id = try mocked.auth.enterGuestMode()
        try mocked.auth.persistSession(email: "u@x.de", accessToken: "a", refreshToken: "r")
        mocked.setHandler { _ in (200, Data()) }

        await mocked.auth.signOut(keepGuestMode: true)
        #expect(mocked.auth.status == .guest(id: id))
        #expect(mocked.auth.currentGuestId() == id)
    }

    @Test("signOut(keepGuestMode: true) erzeugt neue Guest-ID wenn keine existiert")
    func signOutCreatesGuestWhenMissing() async throws {
        let mocked = makeMockedAuth()
        try mocked.auth.persistSession(email: "u@x.de", accessToken: "a", refreshToken: "r")
        mocked.setHandler { _ in (200, Data()) }

        await mocked.auth.signOut(keepGuestMode: true)
        if case let .guest(id) = mocked.auth.status {
            #expect(!id.isEmpty)
            #expect(mocked.auth.currentGuestId() == id)
        } else {
            Issue.record("Expected .guest after signOut(keepGuestMode:), got \(mocked.auth.status)")
        }
    }

    // MARK: - refreshAccessToken Resilience

    @Test("refresh 503 wirft serviceUnavailable, behält Session")
    func refreshKeepsSessionOn503() async throws {
        let mocked = makeMockedAuth()
        try mocked.auth.persistSession(email: "u@x.de", accessToken: "a", refreshToken: "r")
        mocked.setHandler { _ in
            (503, Data(#"{"error":"SERVICE_UNAVAILABLE","status":503}"#.utf8))
        }

        do {
            _ = try await mocked.auth.refreshAccessToken()
            Issue.record("Expected throw on 503")
        } catch let err as AuthError {
            #expect(err == .serviceUnavailable)
        }
        #expect(mocked.auth.status == .signedIn(email: "u@x.de"))
    }

    @Test("refresh 500 wirft serverInternal, behält Session")
    func refreshKeepsSessionOn500() async throws {
        let mocked = makeMockedAuth()
        try mocked.auth.persistSession(email: "u@x.de", accessToken: "a", refreshToken: "r")
        mocked.setHandler { _ in
            (500, Data(#"{"error":"INTERNAL","status":500}"#.utf8))
        }

        do {
            _ = try await mocked.auth.refreshAccessToken()
            Issue.record("Expected throw on 500")
        } catch let err as AuthError {
            #expect(err == .serverInternal)
        }
        #expect(mocked.auth.status == .signedIn(email: "u@x.de"))
    }

    @Test("refresh 429 wirft rateLimited, behält Session")
    func refreshKeepsSessionOnRateLimit() async throws {
        let mocked = makeMockedAuth()
        try mocked.auth.persistSession(email: "u@x.de", accessToken: "a", refreshToken: "r")
        mocked.setHandler { _ in
            (429, Data(#"{"error":"RATE_LIMITED","retryAfterSec":30,"status":429}"#.utf8))
        }

        do {
            _ = try await mocked.auth.refreshAccessToken()
            Issue.record("Expected throw on 429")
        } catch let err as AuthError {
            if case let .rateLimited(retryAfter) = err {
                #expect(retryAfter == 30)
            } else {
                Issue.record("Expected .rateLimited, got \(err)")
            }
        }
        #expect(mocked.auth.status == .signedIn(email: "u@x.de"))
    }

    @Test("refresh 401 invalidiert Session ohne Guest → .signedOut")
    func refreshInvalidates401NoGuest() async throws {
        let mocked = makeMockedAuth()
        try mocked.auth.persistSession(email: "u@x.de", accessToken: "a", refreshToken: "r")
        mocked.setHandler { _ in
            (401, Data(#"{"error":"UNAUTHORIZED","status":401}"#.utf8))
        }

        do {
            _ = try await mocked.auth.refreshAccessToken()
            Issue.record("Expected throw on 401")
        } catch let err as AuthError {
            #expect(err.invalidatesSession)
        }
        #expect(mocked.auth.status == .signedOut)
    }

    @Test("refresh 401 mit Guest-ID fällt auf .guest zurück")
    func refreshInvalidates401WithGuest() async throws {
        let mocked = makeMockedAuth()
        let id = try mocked.auth.enterGuestMode()
        try mocked.auth.persistSession(email: "u@x.de", accessToken: "a", refreshToken: "r")
        mocked.setHandler { _ in
            (401, Data(#"{"error":"UNAUTHORIZED","status":401}"#.utf8))
        }

        _ = try? await mocked.auth.refreshAccessToken()
        #expect(mocked.auth.status == .guest(id: id))
        #expect(mocked.auth.currentGuestId() == id)
    }

    // MARK: - AuthError.invalidatesSession

    @Test("invalidatesSession unterscheidet Session-Tot vs. transient")
    func invalidatesSessionPartitioning() {
        // Tot — Session muss weg
        #expect(AuthError.invalidCredentials.invalidatesSession)
        #expect(AuthError.unauthorized.invalidatesSession)
        #expect(AuthError.tokenExpired.invalidatesSession)
        #expect(AuthError.tokenInvalid.invalidatesSession)

        // Transient — Session bleibt
        #expect(!AuthError.serviceUnavailable.invalidatesSession)
        #expect(!AuthError.serverInternal.invalidatesSession)
        #expect(!AuthError.networkFailure("offline").invalidatesSession)
        #expect(!AuthError.rateLimited(retryAfter: 30).invalidatesSession)
        #expect(!AuthError.accountLocked(retryAfter: nil).invalidatesSession)
    }
}