import dotenv from "dotenv";
import { userModel } from "../../schemas/user.schema.js";
import jwt from "jsonwebtoken";
import log4js from "log4js";
import mongoose from "mongoose";
import { newAuditLog } from "../../util/index.js";
import { auditLogModel } from "../../schemas/auditlog.schema.js";

dotenv.config();

const logger = log4js.getLogger("Users");
logger.level = process.env.LOG_LEVEL;

export const listUsersRouteHandler = async (
  req,
  res,
  page = 1,
  limit = 25,
  property = "",
  filter = {},
) => {
  try {
    // Calculate the skip value based on the page number and limit
    const skip = (page - 1) * limit;

    let user;
    let aggregateCommand = [];

    if (filter != {}) {
      // use filtering if present
      aggregateCommand.push({ $match: filter });
    }

    if (property != "") {
      aggregateCommand.push({ $group: { _id: `$${property}` } }); // group all same properties
      aggregateCommand.push({ $project: { _id: 0, [property]: "$_id" } }); // rename _id to the property name
   
    }

    aggregateCommand.push({ $skip: skip });
    aggregateCommand.push({ $limit: Number(limit) });

    console.log(aggregateCommand);

    user = await userModel.aggregate(aggregateCommand);

    logger.trace(
      `List of users (Page ${page}, Limit ${limit}, Property ${property}):`,
      user,
    );
    res.send(user);
  } catch (error) {
    logger.error("Error listing users:", error);
    res.status(500).send({ error: error });
  }
};

export const getUserRouteHandler = async (req, res) => {
  try {
    // Get ID from params
    const id = new mongoose.Types.ObjectId(req.params.id);
    // Fetch the user with the given ID
    const user = await userModel.findOne({
      _id: id,
    });

    if (!user) {
      logger.warn(`User not found with supplied id.`);
      return res.status(404).send({ error: "User not found." });
    }

    logger.trace(`User with ID: ${id}:`, user);

    const auditLogs = await auditLogModel.find({ 
      target: id 
    }).populate('owner');

    res.send({...user._doc, auditLogs: auditLogs});
  } catch (error) {
    logger.error("Error fetching User:", error);
    res.status(500).send({ error: error.message });
  }
};

export const editUserRouteHandler = async (req, res) => {
  try {
    // Get ID from params
    const id = new mongoose.Types.ObjectId(req.params.id);
    // Fetch the user with the given ID
    const user = await userModel.findOne({ _id: id });

    if (!user) {
      // Error handling
      logger.warn(`User not found with supplied id.`);
      return res.status(404).send({ error: "User not found." });
    }

    logger.trace(`User with ID: ${id}:`, user);

    try {
      const updateData = {
        updatedAt: new Date(),
        username: req.body.username,
        name: req.body.name,
        firstName: req.body.firstName,
        lastName: req.body.lastName,
        email: req.body.email,
      };

      console.log(req.user)

      // Create audit log before updating
      await newAuditLog(
        user.toObject(),
        updateData,
        id,
        'User',
        req.user._id,
        'User'
      );

      const result = await userModel.updateOne(
        { _id: id },
        { $set: updateData },
      );
      if (result.nModified === 0) {
        logger.error("No User updated.");
        res.status(500).send({ error: "No users updated." });
      }
    } catch (updateError) {
      logger.error("Error updating user:", updateError);
      res.status(500).send({ error: updateError.message });
    }
    res.send("OK");
  } catch (fetchError) {
    logger.error("Error fetching user:", fetchError);
    res.status(500).send({ error: fetchError.message });
  }
};