const razorpay = require("razorpay");
const Order = require("../models/Order");
const User = require("../models/User");
const CourseType = require("../models/CourseType");
const Course = require("../models/Course");
const Student = require("../models/Student");
const Coupon = require("../models/Coupon");
const { getAllCoupons } = require("./coupon");

//test credentials of razorpay
const instance = new razorpay({
  key_id: process.env.KEY_ID,
  key_secret: process.env.KEY_SECRET,
});

module.exports.postVerify = async (req, res, next) => {
  try {
    //Secret we put in razorpay
    const SECRET = "CantileverLabs";

    const crypto = require("crypto");

    const shasum = crypto.createHmac("sha256", SECRET);
    shasum.update(JSON.stringify(req.body));
    const digest = shasum.digest("hex");

    //if secret is matched
    if (digest === req.headers["x-razorpay-signature"]) {
      console.log("request is legit");
      // process it
      const orderId = req.body.payload.payment.entity.order_id;
      //fetching the order from the orderId
      let order = await Order.findOne({ orderId: orderId });
      let courseId = order.course;
      //adding the payment detail
      order.paymentDetail = req.body.payload.payment;
      //making the paymentSuccess as true
      order.paymentSuccess = true;

      //now getting the details of user which has bought this course
      const userId = order.user;
      let user = await User.findById(userId);
      let student = await Student.findById(user.student);

      let ind = -1;
      //checking whether user has already bought this course or not
      if (student.courses) {
        ind = student.courses.findIndex(
          (course) => String(course.basicInfo) == String(courseId)
        );
      }
      console.log(ind);
      if (ind == -1) {
        //adding a new object in the courses array of student
        let newObj = {
          basicInfo: courseId,
          details: {
            completed: [],
          },
        };
        let courses = [...student.courses];
        courses.push(newObj);
        student.courses = courses;
        await student.save();
        await order.save();
        res.status(200).json({
          status: "ok",
        });
      } else {
        //user has already bought this course
        res.status(200).json({
          error: "already paid",
        });
      }

      //now updating that course in user also
      //console.log(req.body.payload.payment) ;
      //require('fs').writeFileSync('payment1.json', JSON.stringify(req.body, null, 4))
    } else {
      // pass it
      console.log("HELLO IN ERROR");
      res.status(200).json({
        error: "error",
      });
    }
  } catch (err) {
    console.log(err);
  }
};

module.exports.postRazorpay = async (req, res, next) => {
  try {
    //this route will be called after clicking the payment

    //here this is the id of courseType
    const courseId = req.body.courseId;
    const couponCode = req.body.couponCode;
    const userId = req.user._id;

    console.log(
      "Course ID =",
      courseId,
      " Coupon code =",
      couponCode,
      " user ID =",
      userId
    );

    let user = await User.findById(userId);
    let student = await Student.findById(user.student);
    let course = await CourseType.findById(courseId);

    console.log(student.courses);
    //we are creating a new order associated to it
    //we are setting the paymentSuccess to be false

    let discount = 0;

    let coupon = await Coupon.findOne({ couponCode: couponCode });
    if (coupon && coupon.numAllowed > 0) {
      discount = coupon.percentage;
    }

    let ind = -1;
    //checking whether user has already bought this course or not
    if (student.courses) {
      ind = student.courses.findIndex(
        (course) => String(course.basicInfo) == String(courseId)
      );
    }
    console.log(ind);
    if (ind == -1) {
      let order = new Order({
        course: courseId,
        user: userId,
        paymentSuccess: false,
      });

      order = await order.save();

      const payment_capture = 1;

      //setting the amount according to the course
      let amount = Number(course.amount);

      amount = amount - (amount * discount) / 100;

      amount = Math.ceil(amount);

      const options = {
        amount: (amount * 100).toString(),
        currency: "INR",
        receipt: order._id.toString(),
        payment_capture,
      };

      //this is a razorpay feature
      const response = await instance.orders.create(options);

      order.orderId = response.id;
      await order.save();
      res.status(200).json({
        id: response.id,
        currency: response.currency,
        amount: response.amount,
        name: user.firstName + " " + user.lastName,
        email: user.email,
        receipt: response.receipt,
        date_purchased: response.created_at,
      });
      if (coupon && coupon.numAllowed > 0) {
        coupon.numAllowed = coupon.numAllowed - 1;
        await coupon.save();
      }
    } else {
      //user has already bought this course
      res.status(500).json({
        error: "already paid",
      });
    }
  } catch (err) {
    console.log(err);
    res.status(500).json({
      error: "error",
    });
  }
};