package com.plannaplan.controllers;

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

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

import java.util.ArrayList;
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.User;
import com.plannaplan.responses.mappers.AssignmentResponseMappers;
import com.plannaplan.responses.models.AssignmentResponse;
import com.plannaplan.services.AssignmentService;
import com.plannaplan.services.CommisionService;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestMapping;

@RestController
@CrossOrigin
@RequestMapping("/api/" + App.API_VERSION + "/assignments")
@Api(tags = {
        "Assignments" }, value = "Assignments", description = "Assignment is representation of student willing to join given group (lecture or calss)")
public class AssignmentsController extends TokenBasedController {

    @Autowired
    private CommisionService commisionService;

    @Autowired
    private AssignmentService assignmentService;

    @GetMapping("/user")
    @ApiOperation(value = "Return user current assignemts (from newest commision). STUDENT Token needs to be provided.")
    public ResponseEntity<List<AssignmentResponse>> getCurrentAssignments() throws Exception {
        User user = this.getCurrentUser().orElseThrow(() -> new NullPointerException("User not found"));
        Optional<Commision> com = this.commisionService.getNewestCommision(user);

        if (com.isPresent()) {
            List<Assignment> respone = this.assignmentService.getCommisionAssignments(com.get());
            return new ResponseEntity<>(AssignmentResponseMappers.mapToResponse(respone), HttpStatus.OK);
        }

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