using System;
using System.IO;
using Paca.Mobile.Core;
using Paca.Tests.Infrastructure;
using Xunit;

namespace Paca.Tests.Core;

/// <summary>
/// Gate 179 ~ 182: 스마트 대역폭 스케줄러 & 야간 오프피크 자동 큐잉 엔진 기계적 검증
/// </summary>
public class SmartBandwidthSchedulerGateTests
{
    [Fact]
    public void Gate179_BandwidthSchedulePolicy_Immediate_AlwaysAllowed()
    {
        var policy = BandwidthSchedulePolicy.ImmediateUncapped;
        var now = new DateTimeOffset(2026, 9, 4, 14, 0, 0, TimeSpan.FromHours(9)); // 오후 2시

        Assert.True(policy.IsDownloadAllowed(now));
        Assert.Equal(0, policy.GetCurrentRateLimitBytesPerSec(now)); // 0 = 무제한
    }

    [Fact]
    public void Gate180_BandwidthSchedulePolicy_NightOwl_TimeWindow()
    {
        // 01:00 ~ 06:00 야간 정책
        var policy = new BandwidthSchedulePolicy(
            ScheduleMode.NightOwlOffPeak,
            StartHour: 1,
            EndHour: 6,
            ThrottledBytesPerSec: 0
        );

        // 오후 14:00 -> 다운로드 대기(false)
        var afternoon = new DateTimeOffset(2026, 9, 4, 14, 30, 0, TimeSpan.FromHours(9));
        Assert.False(policy.IsDownloadAllowed(afternoon));

        // 새벽 03:00 -> 다운로드 허용(true)
        var midnight = new DateTimeOffset(2026, 9, 4, 3, 0, 0, TimeSpan.FromHours(9));
        Assert.True(policy.IsDownloadAllowed(midnight));
    }

    [Fact]
    public void Gate181_BandwidthSchedulePolicy_BusinessHours_Throttling()
    {
        // 09:00 ~ 18:00 업무 시간 1MB/s 제한, 그 외 무제한
        var policy = new BandwidthSchedulePolicy(
            ScheduleMode.BusinessHoursThrottled,
            StartHour: 9,
            EndHour: 18,
            ThrottledBytesPerSec: 1_048_576 // 1 MB/s
        );

        // 오전 11:00 -> 스로틀 적용 (1MB/s)
        var workingTime = new DateTimeOffset(2026, 9, 4, 11, 0, 0, TimeSpan.FromHours(9));
        Assert.True(policy.IsDownloadAllowed(workingTime));
        Assert.Equal(1_048_576, policy.GetCurrentRateLimitBytesPerSec(workingTime));

        // 밤 21:00 -> 무제한 (0)
        var evening = new DateTimeOffset(2026, 9, 4, 21, 0, 0, TimeSpan.FromHours(9));
        Assert.True(policy.IsDownloadAllowed(evening));
        Assert.Equal(0, policy.GetCurrentRateLimitBytesPerSec(evening));
    }

    [Fact]
    public void Gate182_ServerHost_SchedulePolicy_Endpoint_Audit()
    {
        var serverHostPath = Path.Combine(SourceTree.Root, "src", "Paca.Server", "ServerHost.cs");
        Assert.True(File.Exists(serverHostPath), "ServerHost.cs must exist");

        var code = File.ReadAllText(serverHostPath);

        Assert.Contains("/api/config/schedule", code);
    }
}