//
// BLEServiceCoreTests.swift
// bitchatTests
//
// Focused BLEService tests for packet handling behavior.
//

import Testing
import Foundation
import CoreBluetooth
@testable import bitchat

struct BLEServiceCoreTests {

    @Test
    func duplicatePacket_isDeduped() async {
        let ble = makeService()
        let delegate = PublicCaptureDelegate()
        ble.delegate = delegate

        let sender = PeerID(str: "1122334455667788")
        let timestamp = UInt64(Date().timeIntervalSince1970 * 1000)
        let packet = makePublicPacket(content: "Hello", sender: sender, timestamp: timestamp)

        ble._test_handlePacket(packet, fromPeerID: sender)
        ble._test_handlePacket(packet, fromPeerID: sender)

        _ = await TestHelpers.waitUntil({ delegate.publicMessagesSnapshot().count == 1 },
                                        timeout: TestConstants.shortTimeout)

        let messages = delegate.publicMessagesSnapshot()
        #expect(messages.count == 1)
        #expect(messages.first?.content == "Hello")
    }

    @Test
    func staleBroadcast_isIgnored() async {
        let ble = makeService()
        let delegate = PublicCaptureDelegate()
        ble.delegate = delegate

        let sender = PeerID(str: "A1B2C3D4E5F60708")
        let oldTimestamp = UInt64(Date().addingTimeInterval(-901).timeIntervalSince1970 * 1000)
        let packet = makePublicPacket(content: "Old", sender: sender, timestamp: oldTimestamp)

        ble._test_handlePacket(packet, fromPeerID: sender)

        let didReceive = await TestHelpers.waitUntil({ !delegate.publicMessagesSnapshot().isEmpty }, timeout: 0.3)
        #expect(!didReceive)
        #expect(delegate.publicMessagesSnapshot().isEmpty)
    }

    @Test
    func announceSenderMismatch_isRejected() async throws {
        let ble = makeService()

        let signer = NoiseEncryptionService(keychain: MockKeychain())
        let announcement = AnnouncementPacket(
            nickname: "Spoof",
            noisePublicKey: signer.getStaticPublicKeyData(),
            signingPublicKey: signer.getSigningPublicKeyData(),
            directNeighbors: nil
        )
        let payload = try #require(announcement.encode(), "Failed to encode announcement")

        let derivedPeerID = PeerID(publicKey: announcement.noisePublicKey)
        let wrongFirst = derivedPeerID.bare.first == "0" ? "1" : "0"
        let wrongBare = String(wrongFirst) + String(derivedPeerID.bare.dropFirst())
        let wrongPeerID = PeerID(str: wrongBare)
        let packet = BitchatPacket(
            type: MessageType.announce.rawValue,
            senderID: Data(hexString: wrongPeerID.id) ?? Data(),
            recipientID: nil,
            timestamp: UInt64(Date().timeIntervalSince1970 * 1000),
            payload: payload,
            signature: nil,
            ttl: 7
        )
        let signed = try #require(signer.signPacket(packet), "Failed to sign announce packet")

        ble._test_handlePacket(signed, fromPeerID: wrongPeerID, preseedPeer: false)

        _ = await TestHelpers.waitUntil({ !ble.currentPeerSnapshots().isEmpty }, timeout: 0.3)
        #expect(ble.currentPeerSnapshots().isEmpty)
    }
}

private func makeService() -> BLEService {
    let keychain = MockKeychain()
    let identityManager = MockIdentityManager(keychain)
    let idBridge = NostrIdentityBridge(keychain: MockKeychainHelper())
    return BLEService(keychain: keychain, idBridge: idBridge, identityManager: identityManager)
}

private func makePublicPacket(content: String, sender: PeerID, timestamp: UInt64) -> BitchatPacket {
    BitchatPacket(
        type: MessageType.message.rawValue,
        senderID: Data(hexString: sender.id) ?? Data(),
        recipientID: nil,
        timestamp: timestamp,
        payload: Data(content.utf8),
        signature: nil,
        ttl: 3
    )
}

private final class PublicCaptureDelegate: BitchatDelegate {
    private let lock = NSLock()
    private(set) var publicMessages: [BitchatMessage] = []

    func didReceivePublicMessage(from peerID: PeerID, nickname: String, content: String, timestamp: Date, messageID: String?) {
        let message = BitchatMessage(
            id: messageID,
            sender: nickname,
            content: content,
            timestamp: timestamp,
            isRelay: false,
            originalSender: nil,
            isPrivate: false,
            recipientNickname: nil,
            senderPeerID: peerID,
            mentions: nil
        )
        lock.lock()
        publicMessages.append(message)
        lock.unlock()
    }

    func didReceiveMessage(_ message: BitchatMessage) {}
    func didConnectToPeer(_ peerID: PeerID) {}
    func didDisconnectFromPeer(_ peerID: PeerID) {}
    func didUpdatePeerList(_ peers: [PeerID]) {}
    func didUpdateBluetoothState(_ state: CBManagerState) {}

    func publicMessagesSnapshot() -> [BitchatMessage] {
        lock.lock()
        defer { lock.unlock() }
        return publicMessages
    }
}