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

namespace Paca.Tests.Mobile;

/// <summary>
/// 직관적 다운로드 큐, 다운로드 파일 브라우징, 필터링, 정렬 및 일괄 정리 게이트 (Gate 146 ~ Gate 152)
/// </summary>
public class MobileIntuitiveUxGateTests
{
    [Fact]
    public void Gate146_MobileLibraryFileManager_Scan_Audit()
    {
        var manager = new MobileLibraryFileManager();
        var fakeFiles = new List<LocalDownloadedFile>
        {
            new("v1.mp4", "/storage/emulated/0/Download/v1.mp4", 1024 * 1024 * 50, DateTime.UtcNow.AddMinutes(-10), LocalMediaType.Video),
            new("a1.mp3", "/storage/emulated/0/Download/a1.mp3", 1024 * 1024 * 5, DateTime.UtcNow.AddMinutes(-5), LocalMediaType.Audio),
            new("doc.pdf", "/storage/emulated/0/Download/doc.pdf", 1024 * 100, DateTime.UtcNow, LocalMediaType.Other)
        };

        manager.SetFiles(fakeFiles);
        Assert.Equal(3, manager.Files.Count);
        Assert.Equal("50.0 MB", fakeFiles[0].FormattedSize);
        Assert.Equal("5.0 MB", fakeFiles[1].FormattedSize);
    }

    [Fact]
    public void Gate147_MobileLibraryFilterEngine_Category_Audit()
    {
        var filter = new MobileLibraryFilterEngine();
        var files = new List<LocalDownloadedFile>
        {
            new("vid1.mp4", "/path/vid1.mp4", 500, DateTime.UtcNow, LocalMediaType.Video),
            new("vid2.webm", "/path/vid2.webm", 300, DateTime.UtcNow, LocalMediaType.Video),
            new("song.mp3", "/path/song.mp3", 100, DateTime.UtcNow, LocalMediaType.Audio),
            new("podcast.m4a", "/path/podcast.m4a", 150, DateTime.UtcNow, LocalMediaType.Audio)
        };

        var videos = filter.FilterByCategory(files, LibraryCategoryFilter.Video);
        Assert.Equal(2, videos.Count);
        Assert.All(videos, f => Assert.Equal(LocalMediaType.Video, f.Type));

        var audios = filter.FilterByCategory(files, LibraryCategoryFilter.Audio);
        Assert.Equal(2, audios.Count);
        Assert.All(audios, f => Assert.Equal(LocalMediaType.Audio, f.Type));

        var all = filter.FilterByCategory(files, LibraryCategoryFilter.All);
        Assert.Equal(4, all.Count);
    }

    [Fact]
    public void Gate148_MobileLibrarySortEngine_MultiCriteria_Audit()
    {
        var sorter = new MobileLibrarySortEngine();
        var files = new List<LocalDownloadedFile>
        {
            new("Banana.mp4", "/path/b", 100, DateTime.UtcNow.AddHours(-2), LocalMediaType.Video),
            new("Apple.mp4", "/path/a", 500, DateTime.UtcNow.AddHours(-1), LocalMediaType.Video),
            new("Cherry.mp4", "/path/c", 200, DateTime.UtcNow, LocalMediaType.Video)
        };

        // 최신순 (DateDesc)
        var byDate = sorter.Sort(files, LibrarySortCriteria.DateDesc);
        Assert.Equal("Cherry.mp4", byDate[0].FileName);
        Assert.Equal("Banana.mp4", byDate[2].FileName);

        // 이름순 (NameAsc)
        var byName = sorter.Sort(files, LibrarySortCriteria.NameAsc);
        Assert.Equal("Apple.mp4", byName[0].FileName);
        Assert.Equal("Cherry.mp4", byName[2].FileName);

        // 크기순 (SizeDesc)
        var bySize = sorter.Sort(files, LibrarySortCriteria.SizeDesc);
        Assert.Equal("Apple.mp4", bySize[0].FileName); // 500
        Assert.Equal("Banana.mp4", bySize[2].FileName); // 100
    }

    [Fact]
    public void Gate149_MobileLibraryBatchManager_Cleanup_Audit()
    {
        var batch = new MobileLibraryBatchManager();
        var files = new List<LocalDownloadedFile>
        {
            new("corrupt.part", "/path/corrupt.part", 0, DateTime.UtcNow, LocalMediaType.Other),
            new("normal.mp4", "/path/normal.mp4", 1024, DateTime.UtcNow, LocalMediaType.Video),
            new("empty.tmp", "/path/empty.tmp", 0, DateTime.UtcNow, LocalMediaType.Other)
        };

        var cleaned = batch.PurgeEmptyFiles(files);
        Assert.Single(cleaned);
        Assert.Equal("normal.mp4", cleaned[0].FileName);
    }

    [Fact]
    public void Gate150_MobileQuickDownloadBar_ClipboardDetection_Audit()
    {
        var quickBar = new MobileQuickDownloadBar();
        Assert.False(quickBar.TryDetectDownloadableMedia("안녕하세요 일반 텍스트입니다.", out _));

        Assert.True(quickBar.TryDetectDownloadableMedia("이 영상 봐봐 https://youtu.be/dQw4w9WgXcQ 짱이야", out var extractedUrl));
        Assert.Equal("https://youtu.be/dQw4w9WgXcQ", extractedUrl);
    }

    [Fact]
    public void Gate151_DownloadsPage_HubModel_Audit()
    {
        // 큐 관리와 파일 보관함을 한 곳에서 탭으로 쉽게 전환하는 통합 허브 모델
        var hub = new DownloadsHubModel();
        Assert.Equal(DownloadsHubTab.Queue, hub.CurrentTab);

        hub.SwitchTab(DownloadsHubTab.CompletedLibrary);
        Assert.Equal(DownloadsHubTab.CompletedLibrary, hub.CurrentTab);
    }

    [Fact]
    public void Gate152_EndToEndDownloadsAndLibraryJourneyAudit_Audit()
    {
        var qm = new MobileQueueManager();
        var library = new MobileLibraryFileManager();
        var filter = new MobileLibraryFilterEngine();
        var sorter = new MobileLibrarySortEngine();

        // 1. 큐에 비디오 및 오디오 다운로드 등록
        var item1 = qm.Enqueue("https://example.com/v1.mp4", "Epic Nature 4K");
        var item2 = qm.Enqueue("https://example.com/a1.m4a", "Chill Beats");

        // 2. 다운로드 완료 시 보관함에 자동 등록
        item1.Status = MobileQueueStatus.Completed;
        item2.Status = MobileQueueStatus.Completed;

        library.SetFiles(new List<LocalDownloadedFile>
        {
            new(item1.Title + ".mp4", "/storage/v1.mp4", 1024 * 1024 * 80, DateTime.UtcNow.AddMinutes(-2), LocalMediaType.Video),
            new(item2.Title + ".m4a", "/storage/a1.m4a", 1024 * 1024 * 10, DateTime.UtcNow, LocalMediaType.Audio)
        });

        // 3. 비디오만 필터링
        var videosOnly = filter.FilterByCategory(library.Files, LibraryCategoryFilter.Video);
        Assert.Single(videosOnly);
        Assert.Equal("Epic Nature 4K.mp4", videosOnly[0].FileName);

        // 4. 최신순 정렬
        var sorted = sorter.Sort(library.Files, LibrarySortCriteria.DateDesc);
        Assert.Equal("Chill Beats.m4a", sorted[0].FileName);
    }
}