package nju.seec.helper.controller;

import nju.seec.helper.aspect.auth.Auth;
import nju.seec.helper.controller.response.EmptyResponse;
import nju.seec.helper.controller.response.PageResourceResponse;
import nju.seec.helper.controller.response.ResourceResponse;
import nju.seec.helper.dto.ChooseDTO;
import nju.seec.helper.dto.CourseDTO;
import nju.seec.helper.dto.LoginUser;
import nju.seec.helper.service.CourseService;
import nju.seec.helper.util.enums.UserType;
import nju.seec.helper.util.exception.HelperException;
import nju.seec.helper.vo.CourseVO;
import org.springframework.data.domain.Pageable;
import org.springframework.data.web.PageableDefault;
import org.springframework.web.bind.annotation.*;

import java.util.List;

/**
 * @author cst
 */
@RestController
@RequestMapping("/api/course")
public class CourseController {
    private final CourseService courseService;

    public CourseController(CourseService courseService) {
        this.courseService = courseService;
    }

    @Auth(roles = UserType.TEACHER, message = "创建课程")
    @PostMapping
    public ResourceResponse<CourseVO> createCourse(LoginUser user,
                                                   @RequestBody CourseDTO courseDTO) {
        CourseVO courseVO = courseService.createCourse(user, courseDTO);
        return ResourceResponse.of(courseVO);
    }

    @Auth(roles = UserType.STUDENT, message = "选课")
    @PostMapping("/choose")
    public EmptyResponse chooseCourse(LoginUser user,
                                      @RequestBody ChooseDTO chooseDTO) {
        courseService.chooseCourse(user, chooseDTO);
        return EmptyResponse.getInstance();
    }

    @Auth(roles = {UserType.TEACHER, UserType.STUDENT}, message = "查看课程")
    @GetMapping
    public PageResourceResponse<CourseVO> teacherGetCourses(LoginUser user,
                                                            @RequestParam(required = false, defaultValue = "") String key,
                                                            @PageableDefault(Integer.MAX_VALUE) Pageable pageable) {
        List<CourseVO> courseVOList;
        switch (user.getType()) {
            case TEACHER:
                courseVOList = courseService.teacherGetCourses(user, key, pageable);
                break;
            case STUDENT:
                courseVOList = courseService.studentGetCourses(user, key, pageable);
                break;
            default:
                throw HelperException.of(HelperException.ExceptionType.FORBIDDEN, "您暂时无法查看课程");
        }
        return PageResourceResponse.of(courseVOList, pageable.getPageNumber(), pageable.getPageSize());
    }

    @Auth(roles = UserType.STUDENT, message = "获取所选课程")
    @GetMapping("/choose")
    public PageResourceResponse<CourseVO> studentGetChooseCourses(LoginUser user,
                                                                  @RequestParam(required = false, defaultValue = "") String key,
                                                                  @PageableDefault(Integer.MAX_VALUE) Pageable pageable) {
        List<CourseVO> courseVOList = courseService.studentGetChooseCourses(user, key, pageable);
        return PageResourceResponse.of(courseVOList, pageable.getPageNumber(), pageable.getPageSize());
    }
}