package com.plannaplan.controllers;

import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;
import java.util.Optional;

import com.plannaplan.App;
import com.plannaplan.entities.Assignment;
import com.plannaplan.entities.Commision;
import com.plannaplan.entities.Groups;
import com.plannaplan.entities.User;
import com.plannaplan.exceptions.UserNotFoundException;
import com.plannaplan.responses.mappers.CommisionResponseMappers;
import com.plannaplan.responses.models.CommisionResponse;
import com.plannaplan.services.AssignmentService;
import com.plannaplan.services.CommisionService;
import com.plannaplan.services.GroupService;
import com.plannaplan.types.UserRoles;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.util.Assert;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;

@RestController
@CrossOrigin
@RequestMapping("/api/" + App.API_VERSION + "/commisions")
public class CommisionController extends TokenBasedController {

        @Autowired
        private CommisionService commisionService;

        @Autowired
        private GroupService groupServcicxe;

        @Autowired
        private AssignmentService assignmentService;

        public CommisionController() {
        }

        @PostMapping(value = { "/add", "/add/{id}" })
        public ResponseEntity<String> addCommision(@RequestBody List<Long> groups,
                        @PathVariable(name = "id", required = false) Long userId) {

                try {

                        final User asker = this.getCurrentUser()
                                        .orElseThrow(() -> new UserNotFoundException("Invalid token"));

                        final User user = userId != null
                                        ? userService.getById(userId).orElseThrow(
                                                        () -> new UserNotFoundException("Given user id not exist"))
                                        : asker;

                        Assert.isTrue((asker.getRole() == UserRoles.DEANERY && user.getRole() == UserRoles.STUDENT
                                        || (asker.getId() == user.getId() && user.getRole() == UserRoles.STUDENT)),
                                        "Incorrect attempt to change plan");

                        Optional<Long> notExistingGroup = this.groupServcicxe.findNotExistingGroup(groups);
                        Assert.isTrue(!notExistingGroup.isPresent(), "Group "
                                        + notExistingGroup.orElse(Long.MIN_VALUE).toString() + "doesn't exist");

                        final Commision com = new Commision(user);
                        this.commisionService.save(com);

                        groups.stream().forEach((groupId) -> {
                                Groups group = this.groupServcicxe.getGroupById(groupId)
                                                .orElseThrow(() -> new NullPointerException());
                                Assignment a = new Assignment(group, com);
                                this.assignmentService.save(a);
                        });

                        return new ResponseEntity<>("Succes", HttpStatus.OK);
                } catch (UserNotFoundException exception) {
                        return new ResponseEntity<>(exception.getMessage(), HttpStatus.NOT_FOUND);
                } catch (IllegalArgumentException exception) {
                        return new ResponseEntity<>(exception.getMessage(), HttpStatus.BAD_REQUEST);
                }
        }

        @GetMapping("/getAllCommisions")
        public ResponseEntity<List<CommisionResponse>> getAlCommisions() throws UserNotFoundException {
                User user = this.getCurrentUser().orElseThrow(() -> new NullPointerException());
                List<CommisionResponse> result = CommisionResponseMappers
                                .mapToResponse(this.commisionService.getUsersCommisions(user));
                return new ResponseEntity<>(result, HttpStatus.OK);
        }

}