using IM.Application.Chat.Handlers;
using Xunit;

namespace BuildFlow.IM.Tests.Chat;

/// <summary>
/// 消息撤回权限矩阵与时间窗测试。
/// 测 <see cref="RecallMessageCommandHandler.CanRecall"/> 纯判定逻辑（剥离出 Handler，避免依赖 MongoDB）。
/// </summary>
public class RecallMessageCommandHandlerTests
{
    private static readonly DateTime Now = new(2026, 6, 27, 10, 0, 0, DateTimeKind.Utc);

    [Fact]
    public void Sender_can_recall_within_time_window()
    {
        var createdAt = Now.AddSeconds(-30);
        Assert.True(RecallMessageCommandHandler.CanRecall(isSelf: true, isAdmin: false, createdAt, Now));
    }

    [Fact]
    public void Sender_cannot_recall_after_time_window()
    {
        var createdAt = Now.AddMinutes(-3); // 超过 2 分钟窗口
        Assert.False(RecallMessageCommandHandler.CanRecall(isSelf: true, isAdmin: false, createdAt, Now));
    }

    [Fact]
    public void Sender_can_recall_at_exact_window_boundary()
    {
        // 恰好 2 分钟：<= 窗口，允许撤回（边界含等号）
        var createdAt = Now.AddMinutes(-RecallMessageCommandHandler.RecallTimeWindowMinutes);
        Assert.True(RecallMessageCommandHandler.CanRecall(isSelf: true, isAdmin: false, createdAt, Now));
    }

    [Fact]
    public void Non_participant_cannot_recall()
    {
        var createdAt = Now.AddSeconds(-10);
        Assert.False(RecallMessageCommandHandler.CanRecall(isSelf: false, isAdmin: false, createdAt, Now));
    }

    [Fact]
    public void Group_admin_can_recall_others_message_without_time_limit()
    {
        // 管理员撤回他人 1 小时前的消息，不受时间窗限制
        var createdAt = Now.AddHours(-1);
        Assert.True(RecallMessageCommandHandler.CanRecall(isSelf: false, isAdmin: true, createdAt, Now));
    }

    [Fact]
    public void Group_admin_can_recall_own_message_without_time_limit()
    {
        var createdAt = Now.AddHours(-2);
        Assert.True(RecallMessageCommandHandler.CanRecall(isSelf: true, isAdmin: true, createdAt, Now));
    }
}