//
//  NavigationRouterTests.swift
//  suixinkanTests
//
//  Created by Codex on 2026/6/22.
//

import UIKit
import XCTest
@testable import suixinkan_ios

/// UIKit 主导航器测试，覆盖 Tab 宿主、全局入口和当前栈 push 行为。
@MainActor
final class AppNavigatorTests: XCTestCase {
    /// 测试当前栈 push 会增加选中导航栈层级，并隐藏底部 TabBar。
    func testPushUsesCurrentNavigationStack() {
        let services = AppServices(apiClient: APIClient(session: AppNavigatorRecordingURLSession()))
        let host = AppNavigatorTestHost(services: services)
        let navigator = AppNavigator()
        navigator.attach(host: host)

        navigator.push(.home(.paymentCollection), from: nil, animated: false)

        let homeStack = host.navigationController(for: .home)!
        XCTAssertEqual(homeStack.viewControllers.count, 2)
        XCTAssertTrue(homeStack.viewControllers.last?.hidesBottomBarWhenPushed == true)
        XCTAssertTrue(homeStack.viewControllers.last is PaymentCollectionViewController)
    }

    /// 测试 tabRoot 会切换到指定 Tab、清空旧栈并打开目标页。
    func testTabRootSelectsTabResetsStackAndPushesRoute() {
        let services = AppServices(apiClient: APIClient(session: AppNavigatorRecordingURLSession()))
        let host = AppNavigatorTestHost(services: services)
        let navigator = AppNavigator()
        navigator.attach(host: host)
        host.navigationController(for: .home)?.push(route: .home(.wallet), animated: false)

        navigator.openHome(.taskManagement, policy: .tabRoot(.home), animated: false)

        let homeStack = host.navigationController(for: .home)!
        XCTAssertEqual(host.selectedTab, .home)
        XCTAssertEqual(homeStack.viewControllers.count, 2)
        XCTAssertTrue(homeStack.viewControllers.last is TaskManagementViewController)
    }

    /// 测试 preserveTab 只切换 Tab 并保留旧栈。
    func testPreserveTabKeepsExistingStack() {
        let services = AppServices(apiClient: APIClient(session: AppNavigatorRecordingURLSession()))
        let host = AppNavigatorTestHost(services: services)
        let navigator = AppNavigator()
        navigator.attach(host: host)
        host.navigationController(for: .profile)?.push(route: .profile(.settings), animated: false)

        navigator.openProfile(.realNameAuth, policy: .preserveTab(.profile), animated: false)

        let profileStack = host.navigationController(for: .profile)!
        XCTAssertEqual(host.selectedTab, .profile)
        XCTAssertEqual(profileStack.viewControllers.count, 3)
        XCTAssertTrue(profileStack.viewControllers[1] is SettingsViewController)
        XCTAssertTrue(profileStack.viewControllers.last is RealNameAuthViewController)
    }

    /// 测试宿主未挂载时全局请求会排队，并在 attach 后按顺序执行。
    func testPendingActionsRunAfterAttachInFIFOOrder() {
        let services = AppServices(apiClient: APIClient(session: AppNavigatorRecordingURLSession()))
        let host = AppNavigatorTestHost(services: services)
        let navigator = AppNavigator()

        navigator.openHome(.paymentCollection, policy: .tabRoot(.home), animated: false)
        navigator.openHome(.messageCenter, policy: .preserveTab(.home), animated: false)
        navigator.attach(host: host)

        let homeStack = host.navigationController(for: .home)!
        XCTAssertEqual(homeStack.viewControllers.count, 3)
        XCTAssertTrue(homeStack.viewControllers[1] is PaymentCollectionViewController)
        XCTAssertTrue(homeStack.viewControllers.last is MessageCenterViewController)
    }

    /// 测试 resetAllStacks 会清空暂存请求并重置已挂载宿主。
    func testResetAllStacksClearsPendingAndMountedStacks() {
        let services = AppServices(apiClient: APIClient(session: AppNavigatorRecordingURLSession()))
        let host = AppNavigatorTestHost(services: services)
        let navigator = AppNavigator()

        navigator.openHome(.paymentCollection, policy: .tabRoot(.home), animated: false)
        navigator.resetAllStacks()
        navigator.attach(host: host)
        XCTAssertEqual(host.navigationController(for: .home)?.viewControllers.count, 1)

        navigator.openHome(.wallet, policy: .tabRoot(.home), animated: false)
        navigator.resetAllStacks()
        XCTAssertEqual(host.navigationController(for: .home)?.viewControllers.count, 1)
        XCTAssertEqual(host.selectedTab, .home)
    }

    /// 测试打开订单入口会切到订单 Tab、回到根页面并传递扫码结果。
    func testOpenOrdersEntryAppliesRootStateAndScanCode() {
        let services = AppServices(apiClient: APIClient(session: AppNavigatorRecordingURLSession()))
        let host = AppNavigatorTestHost(services: services)
        let navigator = AppNavigator()
        navigator.attach(host: host)

        navigator.openOrdersEntry(.verificationOrders, scannedCode: "VERIFY001")

        XCTAssertEqual(host.selectedTab, .orders)
        XCTAssertEqual(host.appliedOrdersEntry, .verificationOrders)
        XCTAssertEqual(host.appliedScanCode, "VERIFY001")
        XCTAssertEqual(host.navigationController(for: .orders)?.viewControllers.count, 1)
    }
}

/// AppNavigator 单测专用宿主，模拟主 Tab 容器能力。
@MainActor
private final class AppNavigatorTestHost: AppNavigationHost {
    private let services: AppServices
    private var controllers: [AppTab: TabNavigationController] = [:]
    var selectedTab: AppTab = .home
    var appliedOrdersEntry: OrdersEntry?
    var appliedScanCode: String?

    /// 初始化所有 Tab 导航栈。
    init(services: AppServices) {
        self.services = services
        for tab in AppTab.allCases {
            controllers[tab] = TabNavigationController(tab: tab, services: services)
        }
    }

    /// 选中指定主 Tab。
    func selectTab(_ tab: AppTab) {
        selectedTab = tab
    }

    /// 返回指定 Tab 的导航控制器。
    func navigationController(for tab: AppTab) -> TabNavigationController? {
        controllers[tab]
    }

    /// 返回当前选中 Tab 的导航控制器。
    func selectedNavigationController() -> TabNavigationController? {
        controllers[selectedTab]
    }

    /// 重置全部 Tab 导航栈。
    func resetAllStacks() {
        for controller in controllers.values {
            controller.popToRootViewController(animated: false)
        }
        selectedTab = .home
    }

    /// 记录订单根页面接收到的入口状态。
    func applyOrdersEntry(_ entry: OrdersEntry, scannedCode: String?) {
        appliedOrdersEntry = entry
        appliedScanCode = scannedCode
    }
}

/// 空网络会话，避免路由测试发起真实请求。
private final class AppNavigatorRecordingURLSession: URLSessionProtocol {
    /// 返回空成功响应。
    func data(for request: URLRequest) async throws -> (Data, URLResponse) {
        let response = HTTPURLResponse(
            url: request.url ?? URL(string: "https://example.com")!,
            statusCode: 200,
            httpVersion: nil,
            headerFields: nil
        )!
        return (Data(), response)
    }
}