const courses = require("../controllers/Course.controller.js");

const db = require("..");

var router = require("express").Router();

// Create a new Course
router.post("/", courses.create);

// GET AWARD
router.get("/", async (req, res) => {
  const id = req.query.id;
  if (!id) {
    return db.Course.findAll()
      .then(results => res.send(results))
  }

  return db.Course.findByPk(id)
    .then(async (course) => {
      if (course === null) {
        res.status(404).send({
          message: `Course with id=${id} was not found!`
        });
        return
      }
      res.send(course)
    })
    .catch(err => {
      res.status(500).send({
        message:
          err.message || "Some error occurred while retrieving courses."
      })
    })
});

// GET AWARD DETAILS
router.get("/details", async (req, res) => {
  const id = req.query.id;
  if (!id) {
    res.status(400).send({
      message: "Course id cannot be empty!"
    });
    return
  }
  return db.Course.findByPk(id, {
    include: [
      'trainingsHeld',
      'possibleAwards',
      'sme'
    ]
  })
    .then(async (course) => {
      if (course === null) {
        res.status(404).send({
          message: `Course with id=${id} was not found!`
        });
        return
      }
      res.send(course)
    })
    .catch(err => {
      res.status(500).send({
        message:
          err.message || "Some error occurred while retrieving courses."
      })
    })
});


// GET CATEGORIES
router.get("/categories", async (req, res) => {
  return db.Course.findAll({
    attributes: ['category'],
    group: ['category']
  })
    .then(async (courseCategories) => {
      if (courseCategories === null) {
        res.status(404).send({
          message: `Course categories were not found!`
        });
        return
      }
      res.send(courseCategories.map(courseCategory => courseCategory.category))
    })
    .catch(err => {
      res.status(500).send({
        message:
          err.message || "Some error occurred while retrieving course categories."
      })
    })
});

module.exports = {
  apiPath: "/api/courses",
  apiRouter: router
};