using AxiOmron.PcbCheck.Models;
using AxiOmron.PcbCheck.Options;
using AxiOmron.PcbCheck.Services.Interfaces;
using AxiOmron.PcbCheck.ViewModels;

namespace AxiOmron.PcbCheck.Tests;

/// <summary>
/// 验证系统设置页视图模型中的 SFTP 测试连接行为。
/// </summary>
public sealed class SystemSettingViewModelTests
{
    /// <summary>
    /// 当 SFTP 测试成功时，应更新成功状态文本。
    /// </summary>
    /// <returns>异步测试任务。</returns>
    [Fact]
    public async Task TestSftpConnectionAsync_ShouldReportSuccess_WhenConnectionSucceeds()
    {
        var configService = new FakeAppConfigService();
        var sftpLookupService = new FakeSftpLookupService
        {
            TestOutcome = new SftpConnectionTestOutcome
            {
                IsSuccess = true,
                RootPathAccessible = true,
                StatusMessage = "SFTP 连接成功，根目录可访问。"
            }
        };
        var viewModel = new SystemSettingViewModel(configService, sftpLookupService);

        await viewModel.TestSftpConnectionCommand.ExecuteAsync(null);

        Assert.Equal("SFTP 连接成功，根目录可访问。", viewModel.StatusMessage);
    }

    /// <summary>
    /// 当 SFTP 测试失败时，应将失败原因展示到状态文本。
    /// </summary>
    /// <returns>异步测试任务。</returns>
    [Fact]
    public async Task TestSftpConnectionAsync_ShouldReportFailure_WhenConnectionFails()
    {
        var configService = new FakeAppConfigService();
        var sftpLookupService = new FakeSftpLookupService
        {
            TestOutcome = new SftpConnectionTestOutcome
            {
                IsSuccess = false,
                IsSystemError = true,
                StatusMessage = "SFTP 连接失败: timeout"
            }
        };
        var viewModel = new SystemSettingViewModel(configService, sftpLookupService);

        await viewModel.TestSftpConnectionCommand.ExecuteAsync(null);

        Assert.Equal("SFTP 连接失败: timeout", viewModel.StatusMessage);
    }

    private sealed class FakeAppConfigService : IAppConfigService
    {
        public AppConfig Config { get; } = new();

        public AppConfig Load()
        {
            return Config;
        }

        public void Save(AppConfig config)
        {
            ArgumentNullException.ThrowIfNull(config);
        }

        public string GetConfigPath()
        {
            return "appConfig.json";
        }
    }

    private sealed class FakeSftpLookupService : ISftpLookupService
    {
        public SftpConnectionTestOutcome TestOutcome { get; set; } = new();

        public Task<SftpCheckOutcome> CheckFileAsync(string barcode, CancellationToken cancellationToken)
        {
            throw new NotSupportedException();
        }

        public Task<SftpConnectionTestOutcome> TestConnectionAsync(SftpOptions? options, CancellationToken cancellationToken)
        {
            return Task.FromResult(TestOutcome);
        }
    }
}