const Course = require("../models/Course");
const User = require("../models/User");


// we use req,res because it is not use in our rout
module.exports.addCourse = (req,res) => {

	let newCourse = new Course({
		name:req.body.name,
		description:req.body.description,
		price:req.body.price
	});
	return newCourse.save().then((course,error ) =>{

		if(error){
			return res.send(false);
		}else{
			return res.send(true);
		}
	}).catch();

}

module.exports.getAllCourses = (req,res) =>{

	// to retrieve all the documents in the "course" collection, we will use find({}) method.
	return Product.find({}).then(result =>{
		return res.send(result);
	});
}
	
module.exports.activeproduct = (req,res) =>{
	return Course.find({isActive:true}).then(result =>{
		return res.send(result);
	});
}

// module.exports.getCourse = (req,res) =>{
// 		return Course.findById(req.params.courseId).then(result =>{
// 			return res.send(result);
// 		});

// }
// module.exports.updateCourse = (req, res) => {

// 	// Specify the fields/properties of the document to be updated
// 	let updatedCourse = {
// 		name: req.body.name,
// 		description: req.body.description,
// 		price: req.body.price
// 	}

// 	// Syntax
// 		// findByIdAndUpdate(documentId, updatesToBeApplied)
// 	return Course.findByIdAndUpdate(req.params.courseId, updatedCourse).then((course, error) => {

// 		// If course was not updated
// 		if(error){
// 			return res.send(false);

// 		// If course was updated successfully
// 		} else {
// 			return res.send(true);
// 		}
// 	});
// }
// module.exports.archiveCourse = (req,res)=>{

// 	let updatedActiveField = {
// 		isActive:false
// 	}

// 	return Course.findByIdAndUpdate(req.params.courseId, updatedActiveField).then((course, error) =>{

// 		if(error){
// 			return res.send(false);

// 		// If course was updated successfully
// 		} else {
// 			return res.send(true);
// 		}

// 	});
// }

// module.exports.searchCoursesByName = async (req, res) => {
//   try {
//     const { courseName } = req.body;

//     // Use a regular expression to perform a case-insensitive search
//     // i = this will search something that case- insentitive will not matter
//     // 
//     const courses = await Course.find({
//       name: { $regex: courseName, $options: 'i' }
//     });

//     res.json(courses);
//   } catch (error) {
//     console.error(error);
//     res.status(500).json({ error: 'Internal Server Error' });
//   }
// };

module.exports.getEmailsOfEnrolledUsers = async (req, res) => {
  const courseId = req.params.courseId; // Use req.params instead of req.body

  try {
    // Find the course by courseId
    const course = await Course.findById(courseId);

    if (!course) {
      return res.status(404).json({ message: 'Course not found' });
    }

    // Get the userIds of enrolled users from the course
    const userIds = course.enrollees.map(enrollee => enrollee.userId);

    // Find the users with matching userIds
    const enrolledUsers = await User.find({ _id: { $in: userIds } }); // Use userIds variable instead of undefined "users"

    // Extract the emails from the enrolled users
    const emails = enrolledUsers.map(user => user.email); // Use map instead of forEach

    res.status(200).json({ userEmails: emails }); // Use the correct variable name userEmails instead of emails
  } catch (error) {
    res.status(500).json({ message: 'An error occurred while retrieving enrolled users' });
  }
};



module.exports.activateCourse = (req,res)=>{

	let updatedActiveField = {
		isActive:true
	}

	return Course.findByIdAndUpdate(req.params.courseId, updatedActiveField).then((course, error) =>{

		if(error){
			return res.send(false);

		// If course was updated successfully
		} else {
			return res.send(true);
		}

	});
}

// Controller function to update the user profile
module.exports.updateProfile = async (req, res) => {
  try {
    // Get the user ID from the authenticated token
    const userId = req.user.id;

    // Retrieve the updated profile information from the request body
    const { firstName, lastName, mobileNo } = req.body;

    // Update the user's profile in the database
    const updatedUser = await User.findByIdAndUpdate(
      userId,
      { firstName, lastName, mobileNo },
      { new: true }
    );

    res.json(updatedUser);
  } catch (error) {
    console.error(error);
    res.status(500).json({ message: 'Failed to update profile' });
  }
}