using Microsoft.EntityFrameworkCore;
using NSubstitute;
using UniVerse.Application.DTOs.Lectures;
using UniVerse.Application.Interfaces;
using UniVerse.Domain.Entities;
using UniVerse.Infrastructure.Data;
using UniVerse.Infrastructure.Services;
using Xunit;

namespace UniVerse.Api.Tests.Lectures;

public class LectureServiceTests
{
    [Fact]
    public async Task GetAllAsync_MarksLecturesEnrolledByCurrentUser()
    {
        await using var db = CreateDbContext();
        var service = new LectureService(db, Substitute.For<IGamificationService>());
        var startsAt = DateTime.UtcNow.AddDays(1);

        db.Users.Add(new User { Id = 1, Email = "student@test.local" });
        db.Courses.Add(new Course { Id = 1, Name = "Course" });
        db.Lectures.AddRange(
            Lecture(1, startsAt),
            Lecture(2, startsAt.AddDays(1)));
        db.LectureEnrollments.Add(new LectureEnrollment { LectureId = 1, UserId = 1 });
        await db.SaveChangesAsync();

        var result = await service.GetAllAsync(new LectureFilterRequest(null, null, null, null, null, null, null, null), 1);

        Assert.True(result.Items.Single(item => item.Id == 1).IsEnrolled);
        Assert.False(result.Items.Single(item => item.Id == 2).IsEnrolled);
    }

    private static AppDbContext CreateDbContext()
    {
        var options = new DbContextOptionsBuilder<AppDbContext>()
            .UseInMemoryDatabase($"LectureServiceTests_{Guid.NewGuid()}")
            .Options;
        return new AppDbContext(options);
    }

    private static Lecture Lecture(int id, DateTime startsAt) => new()
    {
        Id = id,
        CourseId = 1,
        Title = $"Lecture {id}",
        StartsAt = startsAt,
        EndsAt = startsAt.AddHours(2),
        IsOpen = true,
        MaxEnrollments = 30
    };
}