using System;
using System.IO;
using System.Threading.Tasks;
using Paca.Core.Platform;
using Paca.Server;
using Paca.Server.Discovery;
using Xunit;

namespace Paca.Tests.Server;

public class ServerResilienceExtremeRedTests
{
    // ==========================================
    // 1. PositionStore
    // ==========================================

    [Theory]
    [InlineData(null)]
    [InlineData("")]
    [InlineData("   ")]
    public void PositionStore_Get_NullOrEmptyId_ReturnsZero(string? id)
    {
        var tempDir = Path.Combine(Path.GetTempPath(), "paca_test_pos_" + Guid.NewGuid().ToString("N"));
        try
        {
            var store = new PositionStore(tempDir);
            var pos = store.Get(id!);
            Assert.Equal(0, pos);
        }
        finally
        {
            if (Directory.Exists(tempDir)) Directory.Delete(tempDir, true);
        }
    }

    [Theory]
    [InlineData(null)]
    [InlineData("")]
    [InlineData("   ")]
    public void PositionStore_Set_NullOrWhitespaceId_DoesNotThrowAndDoesNotPersist(string? id)
    {
        var tempDir = Path.Combine(Path.GetTempPath(), "paca_test_pos_" + Guid.NewGuid().ToString("N"));
        try
        {
            var store = new PositionStore(tempDir);
            var ex = Record.Exception(() => store.Set(id!, 42.5));
            Assert.Null(ex);
            Assert.Equal(0, store.Get(id!));
        }
        finally
        {
            if (Directory.Exists(tempDir)) Directory.Delete(tempDir, true);
        }
    }

    [Theory]
    [InlineData(null)]
    [InlineData("")]
    [InlineData("   ")]
    public void PositionStore_Constructor_NullOrEmptyFolder_DoesNotCrash(string? folder)
    {
        var ex = Record.Exception(() =>
        {
            var store = new PositionStore(folder!);
            var testKey = "test-key-" + Guid.NewGuid().ToString("N");
            Assert.Equal(0, store.Get(testKey));
            store.Set(testKey, 15.0);
            Assert.Equal(15.0, store.Get(testKey));
        });
        Assert.Null(ex);
    }

    // ==========================================
    // 2. Thumbnailer
    // ==========================================

    [Theory]
    [InlineData(null, "C:\\media\\test.mp4")]
    [InlineData("ffmpeg.exe", null)]
    [InlineData("", "C:\\media\\test.mp4")]
    [InlineData("ffmpeg.exe", "   ")]
    public async Task Thumbnailer_GetThumbnailAsync_NullOrEmptyInputs_ReturnsNull(string? ffmpeg, string? media)
    {
        var thumb = new Thumbnailer(DesktopProcessRunner.Default);
        var res = await thumb.GetThumbnailAsync(ffmpeg!, media!);
        Assert.Null(res);
    }

    [Theory]
    [InlineData(null, "C:\\media\\test.mp4")]
    [InlineData("ffmpeg.exe", null)]
    [InlineData("", "C:\\media\\test.mp4")]
    [InlineData("ffmpeg.exe", "   ")]
    public async Task Thumbnailer_GetResolutionAsync_NullOrEmptyInputs_ReturnsNull(string? ffmpeg, string? media)
    {
        var thumb = new Thumbnailer(DesktopProcessRunner.Default);
        var res = await thumb.GetResolutionAsync(ffmpeg!, media!);
        Assert.Null(res);
    }

    // ==========================================
    // 3. MediaLibrary
    // ==========================================

    [Theory]
    [InlineData(null)]
    [InlineData("")]
    [InlineData("   ")]
    public void MediaLibrary_List_NullOrEmptyFolder_ReturnsEmpty(string? folder)
    {
        var list = MediaLibrary.List(folder!);
        Assert.NotNull(list);
        Assert.Empty(list);
    }

    [Theory]
    [InlineData(null, "some-id")]
    [InlineData("C:\\Media", null)]
    [InlineData("", "some-id")]
    [InlineData("C:\\Media", "   ")]
    public void MediaLibrary_Find_NullOrEmptyParameters_ReturnsNull(string? folder, string? id)
    {
        var item = MediaLibrary.Find(folder!, id!);
        Assert.Null(item);
    }

    // ==========================================
    // 4. LanBeaconResponder
    // ==========================================

    [Theory]
    [InlineData(null)]
    [InlineData("")]
    [InlineData("   ")]
    [InlineData("GARBAGE_PAYLOAD")]
    [InlineData("{ \"invalid\": true }")]
    public void LanBeaconResponder_ProcessIncomingPayload_NullOrGarbagePayload_ReturnsNull(string? payload)
    {
        var responder = new LanBeaconResponder("PACA-TEST", 52100);
        var response = responder.ProcessIncomingPayload(payload!, "192.168.1.50");
        Assert.Null(response);
    }

    [Fact]
    public void LanBeaconResponder_BuildPongMessage_NullIp_UsesDefaultIp()
    {
        var responder = new LanBeaconResponder("PACA-TEST", 52100);
        var pong = responder.BuildPongMessage(null);
        Assert.NotNull(pong);
        Assert.Contains("0.0.0.0", pong.Endpoint);
    }
}