using System.Threading;
using System.Threading.Tasks;
using InternshipSystem.Api.Queries;
using InternshipSystem.Api.Security;
using InternshipSystem.Core;
using InternshipSystem.Repository;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;

namespace InternshipSystem.Api.Controllers
{
    [Route("student")]
    [ApiController]
    public class StudentController : ControllerBase
    {
        private readonly InternshipDbContext _context;

        public StudentController(InternshipDbContext context)
        {
            _context = context;
        }

        [HttpGet("current")]
        [Authorize]
        public async Task<Student> GetCurrentStudentData([FromServices] User user, CancellationToken cancellationToken)
        {
            return await _context.Students.FindAsync(user.PersonNumber);
        }
        
        [HttpPut("updateCurrent")]
        [Authorize]
        public async Task<ActionResult> UpdateStudentData([FromBody] StudentForm studentNewData, [FromServices] User user, CancellationToken cancellationToken)
        {
            var validator = new StudentForm.Validator();
            var validationResult = await validator.ValidateAsync(studentNewData, cancellationToken);

            if (!validationResult.IsValid || !user.PersonNumber.Equals(studentNewData.Id))
            {
                return BadRequest();
            }

            var currentStudent = await _context.Students.FindAsync(user.PersonNumber);

            currentStudent.AlbumNumber = studentNewData.AlbumNumber ?? currentStudent.AlbumNumber;
            currentStudent.FirstName = string.IsNullOrEmpty(studentNewData.FirstName) ? currentStudent.FirstName : studentNewData.FirstName;
            currentStudent.LastName = string.IsNullOrEmpty(studentNewData.LastName) ? currentStudent.LastName : studentNewData.LastName;
            currentStudent.Email = string.IsNullOrEmpty(studentNewData.Email) ? currentStudent.Email : studentNewData.Email;
            currentStudent.Course = string.IsNullOrEmpty(studentNewData.Course) ? currentStudent.Course : studentNewData.Course;
            currentStudent.Semester = studentNewData.Semester ?? currentStudent.Semester;

            await _context.SaveChangesAsync(cancellationToken);
            
            return Ok();
        }
    }
}