OppositionController.cs

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using System;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using ScientificReport.BLL.Interfaces;
using ScientificReport.Controllers.Utils;
using ScientificReport.DAL.Entities;
using ScientificReport.DAL.Roles;
using ScientificReport.DTO.Models.Opposition;

namespace ScientificReport.Controllers
{
    [Authorize(Roles = UserProfileRole.Any)]
    public class OppositionController : Controller
    {
        private readonly IOppositionService _oppositionService;
        private readonly IUserProfileService _userProfileService;
        private readonly IDepartmentService _departmentService;

        public OppositionController(
            IOppositionService oppositionService,
            IDepartmentService departmentService,
            IUserProfileService userProfileService
        )
        {
            _oppositionService = oppositionService;
            _userProfileService = userProfileService;
            _departmentService = departmentService;
        }

        // GET: Opposition
        public IActionResult Index(OppositionIndexModel model)
        {
            model.Oppositions = _oppositionService.GetPageByRole(model.CurrentPage, model.PageSize, User);
            model.Count = _oppositionService.GetCountByRole(User);
            return View(model);
        }

        // GET: Opposition/Details/{id}
        public IActionResult Details(Guid? id)
        {
            if (id == null)
            {
                return NotFound();
            }

            var opposition = _oppositionService.GetById(id.Value);
            if (opposition == null)
            {
                return NotFound();
            }

            if (!UserHasPermission(opposition))
            {
                return Forbid();
            }

            return View(opposition);
        }

        // GET: Opposition/Create
        public IActionResult Create() => View();

        // POST: Opposition/Create
        [HttpPost]
        [ValidateAntiForgeryToken]
        public IActionResult Create(OppositionModel model)
        {
            if (!ModelState.IsValid)
            {
                return View(model);
            }

            model.Opponent = _userProfileService.Get(User);
            _oppositionService.CreateItem(model);
            return RedirectToAction(nameof(Index));
        }

        // GET: Opposition/Edit/{id}
        public IActionResult Edit(Guid? id)
        {
            if (id == null)
            {
                return NotFound();
            }

            var opposition = _oppositionService.GetById(id.Value);
            if (opposition == null)
            {
                return NotFound();
            }
            
            if (!UserHasPermission(opposition))
            {
                return Forbid();
            }

            return View(new OppositionEditModel(opposition));
        }

        // POST: Opposition/Edit/{id}
        [HttpPost]
        [ValidateAntiForgeryToken]
        public IActionResult Edit(Guid id, OppositionEditModel model)
        {
            if (id != model.Id || !_oppositionService.Exists(id))
            {
                return NotFound();
            }

            if (!UserHasPermission(_oppositionService.GetById(id)))
            {
                return Forbid();
            }
            
            if (!ModelState.IsValid)
            {
                return View(model);
            }

            _oppositionService.UpdateItem(model);
            return RedirectToAction(nameof(Index));
        }

        // GET: Opposition/Delete/{id}
        public IActionResult Delete(Guid? id)
        {
            if (id == null)
            {
                return NotFound();
            }

            var opposition = _oppositionService.GetById(id.Value);
            if (opposition == null)
            {
                return NotFound();
            }
            
            if (!UserHasPermission(opposition))
            {
                return Forbid();
            }

            return View(opposition);
        }

        // POST: Opposition/Delete/{id}
        [HttpPost, ActionName("Delete")]
        [ValidateAntiForgeryToken]
        public IActionResult DeleteConfirmed(Guid id)
        {
            if (!_oppositionService.Exists(id))
            {
                return NotFound();
            }
            
            if (!UserHasPermission(_oppositionService.GetById(id)))
            {
                return Forbid();
            }
            
            _oppositionService.DeleteById(id);
            return RedirectToAction(nameof(Index));
        }
        
        private bool UserHasPermission(Opposition opposition)
        {
            var user = _userProfileService.Get(User);
            var department = _departmentService.Get(d => d.Staff.Contains(user));
            return PageHelpers.IsAdmin(User) ||
                   PageHelpers.IsHeadOfDepartment(User) &&
                   department.Staff.Contains(opposition.Opponent) ||
                   opposition.Opponent.Id == user.Id;
        }
    }
}