using System;
using System.Linq;
using Jellyfin.Plugin.Floatplane.Api.Models;
using Jellyfin.Plugin.Floatplane.Playback;
using Xunit;

namespace Jellyfin.Plugin.Floatplane.Tests;

public class DeliveryResolverTests
{
    private static ResolvedVariant[] Variants() => Fixture.Json<DeliveryInfoModel>("delivery-info.json").Resolve().ToArray();

    [Fact]
    public void SelectVariant_exact_level()
    {
        var v = DeliveryResolver.SelectVariant(Variants(), "720");

        Assert.NotNull(v);
        Assert.Equal("720-avc1", v!.Name);
    }

    [Fact]
    public void SelectVariant_falls_back_to_not_taller()
    {
        // 2160 is denied → best usable ≤ 2160 is 1080
        var v = DeliveryResolver.SelectVariant(Variants(), "2160");

        Assert.Equal("1080-avc1", v!.Name);

        var v2 = DeliveryResolver.SelectVariant(Variants(), "600");
        Assert.Equal("480-avc1", v2!.Name);
    }

    [Fact]
    public void SelectVariant_falls_back_to_best_when_nothing_fits()
    {
        var v = DeliveryResolver.SelectVariant(Variants(), "240");

        Assert.Equal("1080-avc1", v!.Name);
    }

    [Fact]
    public void SelectVariant_returns_null_without_usable_variants()
    {
        var disabled = Variants().Select(v => new ResolvedVariant(new DeliveryVariant { Name = v.Name, Url = string.Empty, Enabled = false }, v.Url)).ToList();

        Assert.Null(DeliveryResolver.SelectVariant(disabled, "1080"));
        Assert.Null(DeliveryResolver.SelectVariant(Array.Empty<ResolvedVariant>(), "1080"));
    }

    [Fact]
    public void TokenExpiry_reads_exp_from_jwt()
    {
        var url = Variants().First(v => v.Height == 1080).Url;

        var exp = DeliveryResolver.TokenExpiry(url);

        Assert.Equal(DateTimeOffset.FromUnixTimeSeconds(1792935296), exp);
    }

    [Theory]
    [InlineData("https://cdn.example/x.m3u8")]
    [InlineData("https://cdn.example/x.m3u8?token=not-a-jwt")]
    [InlineData("not a url")]
    public void TokenExpiry_returns_null_without_jwt(string url)
    {
        Assert.Null(DeliveryResolver.TokenExpiry(url));
    }
}