using OllamaStudy.Core;

namespace OllamaStudy.CoreTest;

public class OllamaServerConfigTest
{
    private readonly ITestOutputHelper _testOutput;
    private readonly string _configName = "OllamaServerConfig.json";
    private string _defaultConfigText = string.Empty;
    private readonly OllamaServerOption expectedOption = new OllamaServerOption();

    public OllamaServerConfigTest(ITestOutputHelper testOutput)
    { 
        _testOutput = testOutput;
    }

    [Fact]
    public void Config_Test()
    {
        //Arrange（准备阶段）
        var configBuilder = new ConfigurationBuilder()
            .SetBasePath(Directory.GetCurrentDirectory())
            .AddJsonFile(_configName, false, true);

        var config = configBuilder.Build();

        //Act（执行阶段）
        var serverUrl = config.GetValue<string>("OllamaServer:OllamaServerUrl");
        var modelId = config.GetValue<string>("OllamaServer:Model");

        //Assert（断言阶段）
        Assert.NotNull(serverUrl);
        Assert.NotNull(modelId);
        Assert.Equal("http://localhost:11434", serverUrl);
        Assert.Equal("qwen3:0.6b",modelId);
    }

    [Fact]
    public void Config_Bind_Test()
    {
        var configBuild = new ConfigurationBuilder()
            .SetBasePath(Directory.GetCurrentDirectory())
            .AddJsonFile(_configName, false, true);

        var config = configBuild.Build();

        //邦定
        var option = new OllamaServerOption() { OllamaServerUrl="",Model=""};

        //config.Bind(option);
        config.GetSection("OllamaServer").Bind(option);

        //断言
        Assert.Equal("http://localhost:11434",option.OllamaServerUrl);
        Assert.Equal("qwen3:0.6b",option.Model);
    }

    [Fact]
    public void Get_ServerOptions_Test()
    {
        //Arrange（准备阶段）
        var configBuilder = new ConfigurationBuilder()
            .SetBasePath(Directory.GetCurrentDirectory())
            .AddJsonFile(_configName, false, true);

        var config = configBuilder.Build();

        //Act（执行阶段）
        var serverUrl = config.GetValue<string>("OllamaServer:OllamaServerUrl");
        var modelId = config.GetValue<string>("OllamaServer:Model");

        var option = new OllamaServerOption()
        {
            OllamaServerUrl = serverUrl!,
            Model = modelId!
        };


        //Assert（断言阶段）
        Assert.NotNull(serverUrl);
        Assert.NotNull(modelId);
        Assert.Equal("http://localhost:11434", serverUrl);
        Assert.Equal("qwen3:0.6b", modelId);
    }

    [Fact]
    public void Get_IOption_Test()
    {
        //Arrange（准备阶段）
        var configBuilder = new ConfigurationBuilder()
            .SetBasePath(Directory.GetCurrentDirectory())
            .AddJsonFile(_configName, false, true);
        var config = configBuilder.Build();

        var services = new ServiceCollection();
        services
            .AddOptions()
            .Configure<OllamaServerOption>(config.GetRequiredSection("OllamaServer"));

        //Act（执行阶段）
        var o = services.BuildServiceProvider().GetRequiredService<IOptions<OllamaServerOption>>();

        var ollamaServerOption = o.Value;

        //Assert（断言阶段）
        Assert.NotNull(ollamaServerOption);
        Assert.Equal("http://localhost:11434", ollamaServerOption.OllamaServerUrl);
        Assert.Equal("qwen3:0.6b", ollamaServerOption.Model);
    }

    [Fact]
    public void Get_IOptionsSnapshot_Test()
    {
        //Arrange（准备阶段）
        var configBuilder = new ConfigurationBuilder()
            .SetBasePath(Directory.GetCurrentDirectory())
            .AddJsonFile(_configName, false, true);
        var config = configBuilder.Build();

        var services = new ServiceCollection();
        services
            .AddOptions()
            .Configure<OllamaServerOption>(config.GetRequiredSection("OllamaServer"));

        //Act（执行阶段）
        var o = services.BuildServiceProvider().GetRequiredService<IOptionsSnapshot<OllamaServerOption>>();

        var ollamaServerOption = o.Value;

        //Assert（断言阶段）
        Assert.NotNull(ollamaServerOption);
        Assert.Equal("http://localhost:11434", ollamaServerOption.OllamaServerUrl);
        Assert.Equal("qwen3:0.6b", ollamaServerOption.Model);
    }

    [Fact]
    public void Get_IOptionsMonitor_Test()
    {
        //Arrange（准备阶段）
        var configBuilder = new ConfigurationBuilder()
            .SetBasePath(Directory.GetCurrentDirectory())
            .AddJsonFile(_configName,false,true);
        var config = configBuilder.Build();

        var services = new ServiceCollection();
        services
            .AddOptions()
            .Configure<OllamaServerOption>(config.GetRequiredSection("OllamaServer"));

        //Act（执行阶段）
        var provider = services.BuildServiceProvider();
        var optionMonitor = provider.GetRequiredService<IOptionsMonitor<OllamaServerOption>>();

        var ollamaServerOption = optionMonitor.CurrentValue;

        //Assert（断言阶段）
        Assert.NotNull(ollamaServerOption);
        Assert.Equal("http://localhost:11434", ollamaServerOption.OllamaServerUrl);
        Assert.Equal("qwen3:0.6b", ollamaServerOption.Model);

        //修改配置文件后，再次获取值，否会更新？
        ChangeConfig();
        ollamaServerOption = optionMonitor.CurrentValue;

        //Assert（断言阶段）
        Assert.Equal("http://localhost:11434", ollamaServerOption.OllamaServerUrl);
        Assert.NotEqual("qwen3:0.6b", ollamaServerOption.Model);

        ResetConfig();
    }

    [Fact]
    public void Get_IOptionsMonitorCache_Test()
    {
        //Arrange（准备阶段）
        var configBuilder = new ConfigurationBuilder()
            .SetBasePath(Directory.GetCurrentDirectory())
            .AddJsonFile(_configName, false, true);
        var config = configBuilder.Build();

        var services = new ServiceCollection();
        services
            .AddOptions()
            .Configure<OllamaServerOption>(config.GetRequiredSection("OllamaServer"));

        //Act（执行阶段）
        var o = services.BuildServiceProvider().GetRequiredService<IOptionsMonitorCache<OllamaServerOption>>();

        var ollamaServerOption = o.GetOrAdd(Options.DefaultName, ()=>new OllamaServerOption());

        //Assert（断言阶段）
        Assert.NotNull(ollamaServerOption);
        Assert.Equal("http://localhost:11434", ollamaServerOption.OllamaServerUrl);
        Assert.Equal("qwen3:0.6b", ollamaServerOption.Model);
    }

    //改变配置文件
    private void ChangeConfig()
    {
        ConfigBox? configBox = new ConfigBox();

        var filePath = Path.Combine(Directory.GetCurrentDirectory(), _configName);
        using (var file = System.IO.File.OpenText(filePath))
        {
            var configText = file.ReadToEnd();
            configBox = System.Text.Json.JsonSerializer.Deserialize<ConfigBox>(configText);

            //保存默认配置
            this._defaultConfigText = configText;
        }

        if (configBox == null || configBox.OllamaServer == null)
        {
            return;
        }

        //修改内容
        configBox.OllamaServer.Model = Guid.NewGuid().ToString() + "_Model";

        System.Text.Json.JsonSerializerOptions serializerOptions = new System.Text.Json.JsonSerializerOptions()
        {
            WriteIndented = true,
        };

        var newConfigText = System.Text.Json.JsonSerializer.Serialize(configBox, serializerOptions);

        File.WriteAllText(filePath, newConfigText);

        //暂停几秒，让配置文件生效
        Thread.Sleep(3000);
    }

    /// <summary>
    /// 恢复配置文件
    /// </summary>
    private void ResetConfig()
    {
        var filePath = Path.Combine(Directory.GetCurrentDirectory(), _configName);
        File.WriteAllText(filePath, this._defaultConfigText);
    }

    private class ConfigBox
    { 
        public OllamaServerOption? OllamaServer{ get; set; }
    }
}