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

package com.plannaplan.controllers;

import java.util.ArrayList;
import java.util.Dictionary;
import java.util.Hashtable;
import java.util.List;

import com.plannaplan.entities.Groups;
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.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
@CrossOrigin
public class GroupController {
    @Autowired
    private GroupService groupService;

    @GetMapping("/getCourseGroups")
    public ResponseEntity<List<Dictionary<String, Object>>> getCourses(@RequestParam("id") Long id, @RequestParam(name="capacity", defaultValue="true") Boolean capacity){
        List<Groups> groups = this.groupService.getGroupsByCourse(id);
        List<Dictionary<String, Object>> response = new ArrayList<>();


        for (Groups g : groups) {
            Dictionary<String, Object> group = new Hashtable<>();
            group.put("id", g.getId());
            group.put("day", g.getDay().label);
            group.put("time", g.getTimeString());
            group.put("lecturer", g.getLecturer().toString());
            group.put("room", g.getRoom());
            if (capacity) {
                group.put("capacity", g.getCapacity());
            } 
            group.put("type", g.getType());

            response.add(group);
        }

        return new ResponseEntity<>(response, HttpStatus.OK);
    }
}