using Jiaowu.Api.Domain.Academic;
using Jiaowu.Api.Infrastructure.Persistence;
using Microsoft.Data.Sqlite;
using Microsoft.EntityFrameworkCore;

namespace Jiaowu.Api.Tests;

public sealed class PersistenceTests : IAsyncLifetime
{
    private readonly SqliteConnection _connection = new("Data Source=:memory:");
    private AppDbContext _db = null!;

    public async Task InitializeAsync()
    {
        await _connection.OpenAsync();
        var options = new DbContextOptionsBuilder<AppDbContext>()
            .UseSqlite(_connection)
            .Options;
        _db = new AppDbContext(options);
        await _db.Database.EnsureCreatedAsync();
    }

    public async Task DisposeAsync()
    {
        await _db.DisposeAsync();
        await _connection.DisposeAsync();
    }

    [Fact]
    public async Task Catalog_codes_are_unique()
    {
        _db.Campuses.Add(new Campus { Code = "MAIN", Name = "主校区" });
        await _db.SaveChangesAsync();

        _db.Campuses.Add(new Campus { Code = "MAIN", Name = "另一个校区" });

        await Assert.ThrowsAsync<DbUpdateException>(() => _db.SaveChangesAsync());
    }

    [Fact]
    public async Task Organization_relations_can_be_persisted()
    {
        var campus = new Campus { Code = "EAST", Name = "东校区" };
        var college = new College
        {
            Code = "ART",
            Name = "艺术学院",
            CampusId = campus.Id
        };
        var major = new Major
        {
            Code = "1305",
            Name = "设计学",
            CollegeId = college.Id,
            DegreeType = "艺术学学士"
        };
        _db.AddRange(campus, college, major);
        await _db.SaveChangesAsync();

        var saved = await _db.Majors
            .Include(x => x.College)
            .ThenInclude(x => x!.Campus)
            .SingleAsync();

        Assert.Equal("东校区", saved.College!.Campus!.Name);
    }

    [Fact]
    public async Task People_and_course_relations_can_be_persisted()
    {
        var campus = new Campus { Code = "MAIN", Name = "主校区" };
        var college = new College
        {
            Code = "CS",
            Name = "计算机学院",
            CampusId = campus.Id
        };
        var major = new Major
        {
            Code = "080901",
            Name = "计算机科学与技术",
            CollegeId = college.Id,
            DegreeType = "工学学士"
        };
        var administrativeClass = new AdministrativeClass
        {
            Code = "CS2026-01",
            Name = "计科 2026-1 班",
            MajorId = major.Id,
            Grade = 2026
        };
        _db.AddRange(
            campus,
            college,
            major,
            administrativeClass,
            new Teacher
            {
                TeacherNumber = "T2026001",
                Name = "陈老师",
                CollegeId = college.Id,
                Status = TeacherStatus.Active
            },
            new Student
            {
                StudentNumber = "202601001",
                Name = "周同学",
                AdministrativeClassId = administrativeClass.Id,
                EnrollmentYear = 2026,
                EnrollmentDate = new DateOnly(2026, 9, 7),
                Status = StudentStatus.Active
            },
            new Course
            {
                Code = "CS101",
                Name = "程序设计基础",
                CollegeId = college.Id,
                Credits = 4,
                TotalHours = 64,
                LectureHours = 40,
                PracticeHours = 24,
                Nature = CourseNature.MajorRequired,
                AssessmentMethod = AssessmentMethod.Examination
            });
        await _db.SaveChangesAsync();

        var teacher = await _db.Teachers.Include(x => x.College).SingleAsync();
        var student = await _db.Students
            .Include(x => x.AdministrativeClass)
            .ThenInclude(x => x!.Major)
            .SingleAsync();
        var course = await _db.Courses.Include(x => x.College).SingleAsync();

        Assert.Equal("计算机学院", teacher.College!.Name);
        Assert.Equal("计算机科学与技术", student.AdministrativeClass!.Major!.Name);
        Assert.Equal(4m, course.Credits);
        Assert.Equal(course.TotalHours, course.LectureHours + course.PracticeHours);
    }
}