using Service.IconSearch;
using System.Text.Json;

namespace WebApi.Test.Service.IconSearch;

/// <summary>
/// IconifyApiService 单元测试
/// </summary>
public class IconifyApiServiceTest : BaseTest
{
    private readonly IconifyApiService _service;
    private readonly IOptions<IconifySettings> _settings;
    private readonly ILogger<IconifyApiService> _logger;

    public IconifyApiServiceTest()
    {
        _logger = Substitute.For<ILogger<IconifyApiService>>();
        _settings = Options.Create(new IconifySettings
        {
            ApiUrl = "https://api.iconify.design/search",
            DefaultLimit = 20,
            MaxRetryCount = 3,
            RetryDelayMs = 1000
        });
        _service = new IconifyApiService(_settings, _logger);
    }

    #region Response Parsing Tests

    /// <summary>
    /// 测试实际的 Iconify API 响应格式
    /// 实际 API 返回的 icons 是字符串数组，格式为 "collection:iconName"
    /// 例如：["mdi:home", "fa:food"]
    /// </summary>
    [Fact]
    public void IconifyApiResponse_应该正确解析实际API响应格式()
    {
        // Arrange - 这是从 Iconify API 实际返回的格式
        var json = @"{
            ""icons"": [
                ""svg-spinners:wind-toy"",
                ""material-symbols:smart-toy"",
                ""mdi:toy-brick"",
                ""tabler:horse-toy""
            ],
            ""total"": 32,
            ""limit"": 32,
            ""start"": 0,
            ""collections"": {
                ""svg-spinners"": {
                    ""name"": ""SVG Spinners"",
                    ""total"": 46
                },
                ""material-symbols"": {
                    ""name"": ""Material Symbols"",
                    ""total"": 15118
                },
                ""mdi"": {
                    ""name"": ""Material Design Icons"",
                    ""total"": 7447
                },
                ""tabler"": {
                    ""name"": ""Tabler Icons"",
                    ""total"": 5986
                }
            }
        }";

        // Act
        var response = JsonSerializer.Deserialize<IconifyApiResponse>(json);

        // Assert
        response.Should().NotBeNull();
        response!.Icons.Should().NotBeNull();
        response.Icons!.Count.Should().Be(4);
        
        // 验证图标格式正确解析
        response.Icons[0].Should().Be("svg-spinners:wind-toy");
        response.Icons[1].Should().Be("material-symbols:smart-toy");
        response.Icons[2].Should().Be("mdi:toy-brick");
        response.Icons[3].Should().Be("tabler:horse-toy");
    }

    [Fact]
    public void IconifyApiResponse_旧格式测试_应该失败()
    {
        // Arrange - 旧的错误格式（这不是 Iconify 实际返回的）
        var json = @"{
            ""icons"": [
                {
                    ""name"": ""home"",
                    ""collection"": {
                        ""name"": ""mdi""
                    }
                },
                {
                    ""name"": ""food"",
                    ""collection"": {
                        ""name"": ""mdi""
                    }
                }
            ]
        }";

        // Act & Assert - 尝试用新的正确格式解析应该抛出异常
        var exception = Assert.Throws<JsonException>(() =>
        {
            JsonSerializer.Deserialize<IconifyApiResponse>(json);
        });

        // 验证异常消息包含预期的错误信息
        exception.Message.Should().Contain("could not be converted to System.String");
    }

    [Fact]
    public void IconifyApiResponse_应该处理空Icons数组()
    {
        // Arrange
        var json = @"{ ""icons"": [] }";

        // Act
        var response = JsonSerializer.Deserialize<IconifyApiResponse>(json);

        // Assert
        response.Should().NotBeNull();
        response!.Icons.Should().NotBeNull();
        response.Icons!.Count.Should().Be(0);
    }

    [Fact]
    public void IconifyApiResponse_应该处理null_Icons字段()
    {
        // Arrange
        var json = @"{}";

        // Act
        var response = JsonSerializer.Deserialize<IconifyApiResponse>(json);

        // Assert
        response.Should().NotBeNull();
        response!.Icons.Should().BeNull();
    }

    [Fact]
    public void IconCandidate_应该正确生成IconIdentifier()
    {
        // Arrange
        var candidate = new IconCandidate
        {
            CollectionName = "mdi",
            IconName = "home"
        };

        // Act
        var identifier = candidate.IconIdentifier;

        // Assert
        identifier.Should().Be("mdi:home");
    }

    [Theory]
    [InlineData("mdi", "food", "mdi:food")]
    [InlineData("fa", "shopping-cart", "fa:shopping-cart")]
    [InlineData("tabler", "airplane", "tabler:airplane")]
    [InlineData("fluent", "food-24-regular", "fluent:food-24-regular")]
    public void IconCandidate_应该支持多种图标集格式(string collection, string iconName, string expected)
    {
        // Arrange
        var candidate = new IconCandidate
        {
            CollectionName = collection,
            IconName = iconName
        };

        // Act
        var identifier = candidate.IconIdentifier;

        // Assert
        identifier.Should().Be(expected);
    }

    [Theory]
    [InlineData("mdi:food", "mdi", "food")]
    [InlineData("svg-spinners:wind-toy", "svg-spinners", "wind-toy")]
    [InlineData("material-symbols:smart-toy", "material-symbols", "smart-toy")]
    [InlineData("tabler:horse-toy", "tabler", "horse-toy")]
    [InlineData("game-icons:toy-mallet", "game-icons", "toy-mallet")]
    public void IconCandidate_应该从字符串标识符解析出CollectionName和IconName(
        string iconIdentifier, 
        string expectedCollection, 
        string expectedIconName)
    {
        // Arrange & Act - 从 "collection:iconName" 格式解析
        var parts = iconIdentifier.Split(':', 2);
        var candidate = new IconCandidate
        {
            CollectionName = parts[0],
            IconName = parts[1]
        };

        // Assert
        candidate.CollectionName.Should().Be(expectedCollection);
        candidate.IconName.Should().Be(expectedIconName);
        candidate.IconIdentifier.Should().Be(iconIdentifier);
    }

    [Fact]
    public void 从实际API响应解析IconCandidate列表()
    {
        // Arrange - 模拟实际 API 响应的字符串数组
        var iconStrings = new List<string>
        {
            "svg-spinners:wind-toy",
            "material-symbols:smart-toy",
            "mdi:toy-brick",
            "tabler:horse-toy"
        };

        // Act - 模拟 IconifyApiService 应该执行的解析逻辑
        var candidates = iconStrings
            .Select(iconStr =>
            {
                var parts = iconStr.Split(':', 2);
                return parts.Length == 2
                    ? new IconCandidate
                    {
                        CollectionName = parts[0],
                        IconName = parts[1]
                    }
                    : null;
            })
            .Where(c => c != null)
            .ToList();

        // Assert
        candidates.Should().HaveCount(4);
        candidates[0]!.CollectionName.Should().Be("svg-spinners");
        candidates[0]!.IconName.Should().Be("wind-toy");
        candidates[0]!.IconIdentifier.Should().Be("svg-spinners:wind-toy");
        
        candidates[1]!.CollectionName.Should().Be("material-symbols");
        candidates[1]!.IconName.Should().Be("smart-toy");
        
        candidates[2]!.CollectionName.Should().Be("mdi");
        candidates[2]!.IconName.Should().Be("toy-brick");
        
        candidates[3]!.CollectionName.Should().Be("tabler");
        candidates[3]!.IconName.Should().Be("horse-toy");
    }

    #endregion

    #region Settings Tests

    [Fact]
    public void IconifySettings_应该使用默认值()
    {
        // Arrange & Act
        var settings = new IconifySettings();

        // Assert
        settings.ApiUrl.Should().Be("https://api.iconify.design/search");
        settings.DefaultLimit.Should().Be(20);
        settings.MaxRetryCount.Should().Be(3);
        settings.RetryDelayMs.Should().Be(1000);
    }

    [Fact]
    public void IconifySettings_应该接受自定义配置()
    {
        // Arrange & Act
        var settings = new IconifySettings
        {
            ApiUrl = "https://custom-api.example.com/search",
            DefaultLimit = 50,
            MaxRetryCount = 5,
            RetryDelayMs = 2000
        };

        // Assert
        settings.ApiUrl.Should().Be("https://custom-api.example.com/search");
        settings.DefaultLimit.Should().Be(50);
        settings.MaxRetryCount.Should().Be(5);
        settings.RetryDelayMs.Should().Be(2000);
    }

    #endregion

    #region Integration Tests (需要网络连接)

    // 注意：以下测试需要实际的网络连接，可能会失败
    // 在 CI/CD 环境中，建议使用 [Fact(Skip = "Requires network")] 或 mock HTTP 客户端

    [Fact(Skip = "需要网络连接，仅用于手动测试")]
    public async Task SearchIconsAsync_应该返回有效图标列表()
    {
        // Arrange
        var keywords = new List<string> { "food", "restaurant" };

        // Act
        var icons = await _service.SearchIconsAsync(keywords, 10);

        // Assert
        icons.Should().NotBeNull();
        icons.Should().NotBeEmpty();
        icons.All(i => !string.IsNullOrEmpty(i.CollectionName)).Should().BeTrue();
        icons.All(i => !string.IsNullOrEmpty(i.IconName)).Should().BeTrue();
        icons.All(i => i.IconIdentifier.Contains(":")).Should().BeTrue();
    }

    [Fact(Skip = "需要网络连接，仅用于手动测试")]
    public async Task SearchIconsAsync_应该处理无效关键字()
    {
        // Arrange
        var keywords = new List<string> { "xyzabc123nonexistent" };

        // Act
        var icons = await _service.SearchIconsAsync(keywords, 10);

        // Assert
        icons.Should().NotBeNull();
        // 可能返回空列表或少量图标
        icons.Count.Should().BeGreaterThanOrEqualTo(0);
    }

    [Fact(Skip = "需要网络连接，仅用于手动测试")]
    public async Task SearchIconsAsync_应该合并多个关键字的结果()
    {
        // Arrange
        var keywords = new List<string> { "home", "house" };

        // Act
        var icons = await _service.SearchIconsAsync(keywords, 5);

        // Assert
        icons.Should().NotBeNull();
        // 应该从两个关键字中获取图标
        icons.Count.Should().BeGreaterThan(0);
    }

    [Fact]
    public async Task SearchIconsAsync_应该处理空关键字列表()
    {
        // Arrange
        var keywords = new List<string>();

        // Act
        var icons = await _service.SearchIconsAsync(keywords, 10);

        // Assert
        icons.Should().NotBeNull();
        icons.Should().BeEmpty();
    }

    [Fact(Skip = "需要网络连接，仅用于手动测试")]
    public async Task SearchIconsAsync_应该使用默认Limit()
    {
        // Arrange
        var keywords = new List<string> { "food" };

        // Act
        var icons = await _service.SearchIconsAsync(keywords, 0); // limit=0 应该使用默认值20

        // Assert
        icons.Should().NotBeNull();
        // 应该返回不超过20个图标（如果API有足够的结果）
        icons.Count.Should().BeLessThanOrEqualTo(20);
    }

    #endregion

    #region Error Handling Tests

    [Fact]
    public async Task SearchIconsAsync_应该处理部分关键字失败的情况()
    {
        // Arrange
        var keywords = new List<string> { "food" }; // 假设这个能成功

        // Act
        var icons = await _service.SearchIconsAsync(keywords, 10);

        // Assert
        // 即使部分关键字失败，也应该返回成功的结果
        icons.Should().NotBeNull();
    }

    #endregion
}