backend/restservice/src/main/java/com/plannaplan/controllers/GroupController.java

package com.plannaplan.controllers;

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

import com.plannaplan.App;
import com.plannaplan.entities.Groups;
import com.plannaplan.responses.mappers.GroupsMappers;
import com.plannaplan.responses.models.GroupDefaultResponse;
import com.plannaplan.responses.models.CourseWithGroupsResponse;
import com.plannaplan.services.GroupService;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.security.access.prepost.PreAuthorize;
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.PutMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiParam;

/**
 * Rest controller to Groups related endpoints. More detailed api docs is
 * available via swagger
 */
@RestController
@CrossOrigin
@RequestMapping("/api/" + App.API_VERSION + "/groups")
@Api(tags = {
        "Group" }, value = "Group", description = "Enpoints to deal with gorups. Group is related directly to course and can be either class and lecture")
public class GroupController {
    @Autowired
    private GroupService groupService;

    /**
     * @param id          course to display with groups
     * @param capacity    should include capaticty in response
     * @param takenPlaces should include takenPlaces in response
     * @return CourseWithGroupsResponse
     */
    @GetMapping("/course/{id}")
    @ApiOperation(value = "Return list of lectures and classes (if present) given course")
    public ResponseEntity<CourseWithGroupsResponse<? extends GroupDefaultResponse>> getCourses(
            @PathVariable(name = "id") Long id,
            @RequestParam(name = "capacity", defaultValue = "true") @ApiParam(value = "Boolean if we want to have capacity field in response") Boolean capacity,
            @RequestParam(name = "takenPlaces", defaultValue = "false") @ApiParam(value = "Boolean if we want to have respoonse with information about taken places by other students") Boolean takenPlaces) {
        List<Groups> groups = this.groupService.getGroupsByCourse(id);

        if (takenPlaces) {
            HashMap<Long, Integer> ammounts = this.groupService.getTakenPlaces(groups);
            if (capacity) {
                return new ResponseEntity<>(GroupsMappers.mapToGetCourseGroupsWithCapacityResponse(groups, ammounts),
                        HttpStatus.OK);
            }
            return new ResponseEntity<>(GroupsMappers.mapToGetCourseGroupsDefaultResponse(groups, ammounts),
                    HttpStatus.OK);
        }

        if (capacity) {
            return new ResponseEntity<>(GroupsMappers.mapToGetCourseGroupsWithCapacityResponse(groups), HttpStatus.OK);
        }
        return new ResponseEntity<>(GroupsMappers.mapToGetCourseGroupsDefaultResponse(groups), HttpStatus.OK);
    }

    /**
     * @param id          group id to change capacity
     * @param newcapacity new capacity to insert
     * @return ResponseEntity was action success
     */
    @PutMapping("/{id}/capacity")
    @PreAuthorize("hasRole('ROLE_DEANERY')")
    @ApiOperation(value = "Change capacity of given group. You need to provide DEANERY token to be ale to change capacity")
    public ResponseEntity<String> updateCapacity(
            @PathVariable(name = "id", required = true) @ApiParam(value = "id of group to change capacity") Long id,
            @RequestParam(name = "newcapacity", required = true) Integer newcapacity) {
        final Optional<Groups> group = this.groupService.getGroupById(id);
        if (group.isEmpty()) {
            return new ResponseEntity<>("Given group doens't exist", HttpStatus.NOT_FOUND);
        }
        final Groups gr = group.get();
        gr.setCapacity(newcapacity);
        this.groupService.save(gr);
        return new ResponseEntity<>("Success", HttpStatus.OK);
    }
}