import dotenv from 'dotenv';
import { productModel } from '../../schemas/management/product.schema.js';
import { partModel } from '../../schemas/management/part.schema.js';
import log4js from 'log4js';
import mongoose from 'mongoose';
import { newAuditLog } from '../../utils.js';
import { auditLogModel } from '../../schemas/management/auditlog.schema.js';
dotenv.config();

const logger = log4js.getLogger('Products');
logger.level = process.env.LOG_LEVEL;

export const listProductsRouteHandler = 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 product;
    let aggregateCommand = [];

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

    if (property != '') {
      // Match documents where the specified property is either null, undefined, empty string, empty array or empty object
      aggregateCommand.push({
        $match: {
          $or: [
            { [property]: null },
            { [property]: '' },
            { [property]: [] },
            { [property]: {} },
            { [property]: { $exists: false } },
          ],
        },
      });
      aggregateCommand.push({ $project: { _id: 1, [property]: 1 } });
    } else {
      aggregateCommand.push({ $project: { image: 0, url: 0 } });
    }

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

    console.log(aggregateCommand);

    product = await productModel.aggregate(aggregateCommand);

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

export const getProductRouteHandler = async (req, res) => {
  try {
    // Get ID from params
    const id = new mongoose.Types.ObjectId(req.params.id);
    // Fetch the product with the given remote address
    const product = await productModel
      .findOne({
        _id: id,
      })
      .populate('vendor')
      .populate('parts');

    if (!product) {
      logger.warn(`Product not found with supplied id.`);
      return res.status(404).send({ error: 'Print job not found.' });
    }

    logger.trace(`Product with ID: ${id}:`, product);

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

    res.send({ ...product._doc, auditLogs: auditLogs });
  } catch (error) {
    logger.error('Error fetching Product:', error);
    res.status(500).send({ error: error.message });
  }
};

export const editProductRouteHandler = async (req, res) => {
  // Get ID from params
  const id = new mongoose.Types.ObjectId(req.params.id);
  var product = null;

  try {
    // Fetch the product with the given remote address
    product = await productModel.findOne({ _id: id });

    if (!product) {
      // Error handling
      logger.warn(`Product not found with supplied id.`);
      return res.status(404).send({ error: 'Print job not found.' });
    }

    logger.trace(`Product with ID: ${id}:`, product);
  } catch (fetchError) {
    logger.error('Error fetching product:', fetchError);
    res.status(500).send({ error: fetchError.message });
  }

  try {
    const updateData = {
      updatedAt: new Date(),
      name: req.body?.name,
      vendor: req.body?.vendor?.id,
      tags: req.body?.tags,
      version: req.body?.version,
      parts: req.body?.parts,
      margin: req.body.margin,
      price: req.body.price,
      marginOrPrice: req.body.marginOrPrice,
    };

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

    const result = await productModel.updateOne({ _id: id }, { $set: updateData });
    if (result.nModified === 0) {
      logger.error('No Product updated.');
      res.status(500).send({ error: 'No products updated.' });
    }
  } catch (updateError) {
    logger.error('Error updating product:', updateError);
    res.status(500).send({ error: updateError.message });
  }
  res.send('OK');
};

export const newProductRouteHandler = async (req, res) => {
  try {
    const newProduct = {
      createdAt: new Date(),
      updatedAt: new Date(),
      name: req.body.name,
      vendor: req.body.vendor.id,
      parts: partIds,
      margin: req.body.margin,
      price: req.body.price,
      marginOrPrice: req.body.marginOrPrice,
    };

    const newProductResult = await productModel.create(newProduct);

    if (newProductResult.nCreated === 0) {
      logger.error('No product created.');
      res.status(500).send({ error: 'No product created.' });
    }

    // Create audit log for new product
    await newAuditLog({}, newProduct, newProductResult._id, 'Product', req.user._id, 'User');

    const parts = req.body.parts || [];
    const productId = newProductResult._id;

    var partIds = [];

    for (const part of parts) {
      const newPart = {
        createdAt: new Date(),
        updatedAt: new Date(),
        name: part.name,
        product: productId,
      };

      const newPartResult = await partModel.create(newPart);
      if (newPartResult.nCreated === 0) {
        logger.error('No parts created.');
        res.status(500).send({ error: 'No parts created.' });
      }
      partIds.push(newPartResult._id);

      // Create audit log for each new part
      await newAuditLog({}, newPart, newPartResult._id, 'Part', req.user._id, 'User');
    }

    const editProductResult = await productModel.updateOne(
      { _id: productId },
      { $set: { parts: partIds } }
    );

    if (editProductResult.nModified === 0) {
      logger.error('No product updated.');
      res.status(500).send({ error: 'No products updated.' });
    }

    res.status(200).send({ ...newProductResult, parts: partIds });
  } catch (updateError) {
    logger.error('Error updating product:', updateError);
    res.status(500).send({ error: updateError.message });
  }
};