using System.Text.Json;
using Hua.Todo.Application.Services.CloudSync.Models;
using Hua.Todo.Core.Entities;
using Xunit;

namespace Hua.Todo.Host.Tests;

/// <summary>
/// CloudSync DTO 单元测试。
/// </summary>
public class CloudSyncDtoTests
{
    /// <summary>
    /// 测试 CloudTaskItem JSON 序列化使用 camelCase。
    /// </summary>
    [Fact]
    public void CloudTaskItem_Serialization_UsesCamelCase()
    {
        // Arrange
        var item = new CloudTaskItem
        {
            Id = Guid.Parse("12345678-1234-1234-1234-123456789012"),
            Title = "Test",
            Priority = TaskPriority.High,
            IsCompleted = true,
            CreationTime = new DateTime(2024, 1, 1, 0, 0, 0, DateTimeKind.Utc),
            LastModificationTime = new DateTime(2024, 1, 2, 0, 0, 0, DateTimeKind.Utc),
            IsDeleted = false
        };

        // Act
        var json = JsonSerializer.Serialize(item);
        var deserialized = JsonSerializer.Deserialize<Dictionary<string, object>>(json);

        // Assert
        Assert.NotNull(deserialized);
        Assert.True(deserialized.ContainsKey("id"));
        Assert.True(deserialized.ContainsKey("title"));
        Assert.True(deserialized.ContainsKey("priority"));
        Assert.True(deserialized.ContainsKey("isCompleted"));
        Assert.True(deserialized.ContainsKey("creationTime"));
        Assert.True(deserialized.ContainsKey("lastModificationTime"));
        Assert.True(deserialized.ContainsKey("isDeleted"));
    }

    /// <summary>
    /// 测试 CloudTaskUpsert JSON 反序列化。
    /// </summary>
    [Fact]
    public void CloudTaskUpsert_Deserialization_FromCamelCase()
    {
        // Arrange
        var json = @"{""id"":""12345678-1234-1234-1234-123456789012"",""title"":""Test Task"",""priority"":2,""isCompleted"":true,""lastModificationTime"":""2024-01-02T00:00:00Z""}";

        // Act
        var upsert = JsonSerializer.Deserialize<CloudTaskUpsert>(json);

        // Assert
        Assert.NotNull(upsert);
        Assert.Equal(Guid.Parse("12345678-1234-1234-1234-123456789012"), upsert.Id);
        Assert.Equal("Test Task", upsert.Title);
        Assert.Equal(TaskPriority.High, upsert.Priority);
        Assert.True(upsert.IsCompleted);
    }

    /// <summary>
    /// 测试 SyncRequest JSON 反序列化。
    /// </summary>
    [Fact]
    public void SyncRequest_Deserialization()
    {
        // Arrange
        var json = @"{
            ""upserts"": [
                {""id"":""12345678-1234-1234-1234-123456789012"",""title"":""Task 1""},
                {""title"":""Task 2""}
            ],
            ""deletes"": [""87654321-4321-4321-4321-210987654321""]
        }";

        // Act
        var request = JsonSerializer.Deserialize<SyncRequest>(json);

        // Assert
        Assert.NotNull(request);
        Assert.Equal(2, request.Upserts.Count);
        Assert.Single(request.Deletes);
    }

    /// <summary>
    /// 测试 SyncResponse JSON 序列化。
    /// </summary>
    [Fact]
    public void SyncResponse_Serialization()
    {
        // Arrange
        var response = new SyncResponse
        {
            ServerTimeUtc = new DateTime(2024, 1, 1, 12, 0, 0, DateTimeKind.Utc),
            Tasks = new List<CloudTaskItem>
            {
                new CloudTaskItem
                {
                    Id = Guid.NewGuid(),
                    Title = "Task 1",
                    Priority = TaskPriority.Medium
                }
            }
        };

        // Act
        var json = JsonSerializer.Serialize(response);
        var deserialized = JsonSerializer.Deserialize<Dictionary<string, object>>(json);

        // Assert
        Assert.NotNull(deserialized);
        Assert.True(deserialized.ContainsKey("serverTimeUtc"));
        Assert.True(deserialized.ContainsKey("tasks"));
    }

    /// <summary>
    /// 测试 Guid 类型的 JSON 序列化。
    /// </summary>
    [Fact]
    public void Guid_Serialization_IsString()
    {
        // Arrange
        var guid = Guid.NewGuid();
        var item = new CloudTaskItem { Id = guid };

        // Act
        var json = JsonSerializer.Serialize(item);

        // Assert
        Assert.Contains(guid.ToString(), json);
    }
}