using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Paca.Mobile.Core;
using Paca.Tests.Infrastructure;
using Xunit;

namespace Paca.Tests.Core;

/// <summary>
/// Gate 203 ~ 206: 스마트 대기열 우선순위 큐 및 동적 동시성 할당 엔진 기계적 검증
/// </summary>
public class SmartPriorityQueueGateTests
{
    [Fact]
    public void Gate203_SmartPriorityQueue_Orders_By_Priority_Then_Time()
    {
        var queue = new SmartPriorityQueueManager();

        queue.Enqueue("job-1", "Normal Job 1", DownloadPriorityLevel.Normal, DateTimeOffset.UtcNow.AddMinutes(-5));
        queue.Enqueue("job-2", "Low Job", DownloadPriorityLevel.Low, DateTimeOffset.UtcNow.AddMinutes(-4));
        queue.Enqueue("job-3", "Urgent Job", DownloadPriorityLevel.Urgent, DateTimeOffset.UtcNow); // 가장 나중에 추가됨

        var list = queue.GetScheduledJobs();

        Assert.Equal("job-3", list[0].Id); // Urgent가 최상단
        Assert.Equal("job-1", list[1].Id); // Normal
        Assert.Equal("job-2", list[2].Id); // Low
    }

    [Fact]
    public void Gate204_SmartPriorityQueue_BumpToTop()
    {
        var queue = new SmartPriorityQueueManager();

        queue.Enqueue("job-1", "Job 1", DownloadPriorityLevel.Normal);
        queue.Enqueue("job-2", "Job 2", DownloadPriorityLevel.Normal);
        queue.Enqueue("job-3", "Job 3", DownloadPriorityLevel.Normal);

        // job-3을 맨 위로 올리기(Bump)
        var bumped = queue.BumpToTop("job-3");
        Assert.True(bumped);

        var list = queue.GetScheduledJobs();
        Assert.Equal("job-3", list[0].Id);
        Assert.Equal(DownloadPriorityLevel.Urgent, list[0].Priority);
    }

    [Theory]
    [InlineData(NetworkProfileType.WiFi, 4)]
    [InlineData(NetworkProfileType.Cellular5G, 3)]
    [InlineData(NetworkProfileType.CellularLTE, 2)]
    [InlineData(NetworkProfileType.Cellular3G, 1)]
    public void Gate205_DynamicConcurrencyAllocator_Adjusts_By_Network(NetworkProfileType network, int expectedConcurrency)
    {
        var concurrency = DynamicConcurrencyAllocator.DetermineMaxConcurrentDownloads(network, isBatterySavingMode: false);
        Assert.Equal(expectedConcurrency, concurrency);

        // 배터리 절약 모드 켜지면 무조건 1개로 제한
        var batterySavingConcurrency = DynamicConcurrencyAllocator.DetermineMaxConcurrentDownloads(network, isBatterySavingMode: true);
        Assert.Equal(1, batterySavingConcurrency);
    }

    [Fact]
    public void Gate206_ServerHost_QueuePriority_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/queue/{id}/priority", code);
    }
}