using IM.Application.Chat.Commands;
using IM.Application.Chat.DTOs;
using IM.Application.Chat.Validators;
using IM.Domain.Enums;
using Xunit;

namespace BuildFlow.IM.Tests.Chat;

public class SendMessageCommandValidatorTests
{
    private readonly SendMessageCommandValidator _validator = new();

    [Fact]
    public void Rejects_file_message_without_file_metadata()
    {
        var command = CreateCommand(MessageContentType.File, "report.md", null);

        var result = _validator.Validate(command);

        Assert.False(result.IsValid);
        Assert.Contains(result.Errors, e => e.ErrorMessage == "文件消息必须包含文件元数据");
    }

    [Fact]
    public void Accepts_file_message_with_storage_reference_metadata()
    {
        var metadata = new MessageMetadataDto("report.md", 1024, null, null, null, null, null)
        {
            BucketName = "im-files",
            ObjectKey = "im/20260609/report.md",
            ContentType = "text/markdown"
        };
        var command = CreateCommand(MessageContentType.File, "report.md", metadata);

        var result = _validator.Validate(command);

        Assert.True(result.IsValid);
    }

    [Fact]
    public void Rejects_file_message_larger_than_200mb()
    {
        var metadata = new MessageMetadataDto("report.zip", 200L * 1024 * 1024 + 1, null, null, null, null, null)
        {
            BucketName = "im-files",
            ObjectKey = "im/20260705/report.zip",
            ContentType = "application/zip"
        };
        var command = CreateCommand(MessageContentType.File, "report.zip", metadata);

        var result = _validator.Validate(command);

        Assert.False(result.IsValid);
        Assert.Contains(result.Errors, e => e.ErrorMessage == "文件不能超过 200MB");
    }

    [Fact]
    public void Rejects_image_message_without_preview_or_storage_reference()
    {
        var metadata = new MessageMetadataDto("photo.png", 2048, null, null, null, null, null);
        var command = CreateCommand(MessageContentType.Image, "[图片]", metadata);

        var result = _validator.Validate(command);

        Assert.False(result.IsValid);
        Assert.Contains(result.Errors, e => e.ErrorMessage == "图片消息必须包含图片预览地址或存储引用");
    }

    [Fact]
    public void Rejects_unknown_message_content_type()
    {
        var command = CreateCommand((MessageContentType)999, "hello", null);

        var result = _validator.Validate(command);

        Assert.False(result.IsValid);
        Assert.Contains(result.Errors, e => e.ErrorMessage == "不支持的消息类型");
    }

    private static SendMessageCommand CreateCommand(
        MessageContentType contentType,
        string content,
        MessageMetadataDto? metadata)
    {
        return new SendMessageCommand(
            Guid.Parse("11111111-1111-1111-1111-111111111111"),
            Guid.Parse("22222222-2222-2222-2222-222222222222"),
            "alice",
            contentType,
            content,
            metadata,
            null);
    }
}