using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
using Paca.Mobile.Core;
using Xunit;

namespace Paca.Tests.Mobile;

/// <summary>
/// Gate 133 ~ 138: PacaDrop 초고속 미디어 전송 및 Send-to-PC 프로덕션 경험 기계적 검증
/// </summary>
public class MobileProductionFeaturesGateTests
{
    [Fact]
    public void Gate133_PacaDrop_TransferManifest_Integrity()
    {
        var rawData = Encoding.UTF8.GetBytes("PacaDrop-Binary-Content-Payload-Stream-Test-Data");
        var sha256 = Convert.ToHexString(SHA256.HashData(rawData));

        var manifest = new PacaDropManifest(
            FileId: "media-file-99",
            FileName: "BigBuckBunny_4K.mp4",
            TotalBytes: rawData.Length,
            Sha256Checksum: sha256,
            MimeType: "video/mp4",
            CreatedAt: DateTimeOffset.UtcNow
        );

        Assert.Equal("BigBuckBunny_4K.mp4", manifest.FileName);
        Assert.Equal(rawData.Length, manifest.TotalBytes);
        Assert.True(manifest.VerifyChecksum(rawData));

        // 위조되거나 잘린 데이터 검증 실패 확인
        var corruptedData = Encoding.UTF8.GetBytes("Corrupted-Data");
        Assert.False(manifest.VerifyChecksum(corruptedData));
    }

    [Fact]
    public void Gate134_PacaDropTransfer_Progress_And_Speed_Tracking()
    {
        var tracker = new PacaDropProgressTracker(totalBytes: 100_000_000L); // 100MB
        Assert.Equal(0, tracker.Percent);
        Assert.False(tracker.IsCompleted);

        // 50MB 수신 보고
        tracker.UpdateProgress(transferredBytes: 50_000_000L);
        Assert.Equal(50, (int)tracker.Percent);
        Assert.False(tracker.IsCompleted);

        // 100MB 완료 보고
        tracker.UpdateProgress(transferredBytes: 100_000_000L);
        Assert.Equal(100, (int)tracker.Percent);
        Assert.True(tracker.IsCompleted);
    }

    [Fact]
    public void Gate135_SendToPc_SmartDispatcher_Extracts_And_Enriches()
    {
        var dispatcher = new SendToPcDispatcher();
        var rawShareText = "Check this amazing video out! https://youtu.be/dQw4w9WgXcQ?si=abcdef [Sent from Mobile]";

        var request = dispatcher.PrepareRequest(rawShareText, preferredQuality: "4K");
        Assert.NotNull(request);
        Assert.Equal("https://youtu.be/dQw4w9WgXcQ?si=abcdef", request.NormalizedUrl);
        Assert.Equal("YouTube", request.DetectedPlatform);
        Assert.Equal("4K", request.PreferredQuality);
        Assert.True(request.IsReadyForEnqueue);
    }

    [Fact]
    public void Gate136_SendToPc_Rejects_Empty_Or_Non_Url()
    {
        var dispatcher = new SendToPcDispatcher();
        Assert.Null(dispatcher.PrepareRequest("Just random chat message without any link"));
        Assert.Null(dispatcher.PrepareRequest(""));
        Assert.Null(dispatcher.PrepareRequest(null!));
    }

    [Fact]
    public void Gate137_PositionSyncStore_Persists_And_Resolves_Accurately()
    {
        var store = new MobilePlaybackPositionStore();
        store.RecordPosition("item-101", 145.5); // 2분 25.5초 지점

        Assert.Equal(145.5, store.GetPosition("item-101"));
        Assert.Equal(0.0, store.GetPosition("non-existent-item"));

        // 유효하지 않은 음수 위치 방어
        store.RecordPosition("item-101", -5.0);
        Assert.Equal(0.0, store.GetPosition("item-101"));
    }

    [Fact]
    public void Gate138_OfflineStorageQuotaGuard_Evaluates_Available_Space()
    {
        var guard = new OfflineStorageQuotaGuard(maxQuotaBytes: 1_000_000_000L); // 1GB 한도
        Assert.True(guard.CanStoreItem(itemSizeBytes: 200_000_000L, currentUsageBytes: 300_000_000L)); // 500MB < 1GB
        Assert.False(guard.CanStoreItem(itemSizeBytes: 800_000_000L, currentUsageBytes: 300_000_000L)); // 1.1GB > 1GB
    }
}