import dotenv from "dotenv";
import { partModel } from "../../schemas/management/part.schema.js";
import log4js from "log4js";
import mongoose from "mongoose";
import multer from "multer";
import fs from "fs";
import path from "path";
import { newAuditLog } from "../../util/index.js";
import { auditLogModel } from "../../schemas/management/auditlog.schema.js";

dotenv.config();

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

// Set storage engine
const partsStorage = multer.diskStorage({
  destination: process.env.PART_STORAGE,
  filename: async function (req, file, cb) {
    // Retrieve custom file name from request body
    const customFileName = req.params.id || "default"; // Default to 'default' if not provided
    // Create the final filename ensuring it ends with .g
    const finalFilename = `${customFileName}.stl`;

    // Call callback with the final filename
    cb(null, finalFilename);
  },
});

// Initialise upload
const partUpload = multer({
  storage: partsStorage,
  limits: { fileSize: 500000000 }, // 50MB limit
  fileFilter: function (req, file, cb) {
    checkFileType(file, cb);
  },
}).single("partFile"); // The name attribute of the file input in the HTML form

// Check file type
function checkFileType(file, cb) {
  // Allowed ext
  const filetypes = /stl|stl|stl/;
  // Check ext
  const extname = filetypes.test(path.extname(file.originalname).toLowerCase());

  if (extname) {
    console.log(file);
    return cb(null, true);
  } else {
    cb("Error: .stl files only!");
  }
}

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

    let part;
    let aggregateCommand = [];

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

    if (property != "") {
      logger.error(property);
      aggregateCommand.push({ $group: { _id: `$${property}` } }); // group all same properties
      aggregateCommand.push({ $project: { _id: 0, [property]: "$_id" } }); // rename _id to the property name
    } else {
      aggregateCommand.push({
        $lookup: {
          from: "products", // The collection name (usually lowercase plural)
          localField: "product", // The field in your current model
          foreignField: "_id", // The field in the products collection
          as: "product", // The output field name
        },
      });
      aggregateCommand.push({ $unwind: "$product" });
      aggregateCommand.push({
        $project: {
          name: 1,
          _id: 1,
          createdAt: 1,
          updatedAt: 1,
          "product._id": 1,
          "product.name": 1,
        },
      });
    }

    // Add sorting if sort parameter is provided
    if (sort) {
      const sortOrder = order === "descend" ? -1 : 1;
      aggregateCommand.push({ $sort: { [sort]: sortOrder } });
    }

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

    console.log(aggregateCommand);

    part = await partModel.aggregate(aggregateCommand);

    logger.trace(
      `List of parts (Page ${page}, Limit ${limit}, Property ${property}, Sort ${sort}, Order ${order}):`,
      part,
    );
    res.send(part);
  } catch (error) {
    logger.error("Error listing parts:", error);
    res.status(500).send({ error: error });
  }
};

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

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

    logger.trace(`Part with ID: ${id}:`, part);

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

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

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

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

    logger.trace(`Part with ID: ${id}:`, part);

    try {
      const { createdAt, updatedAt, started_at, status, ...updateData } =
        req.body;

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

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

export const newPartRouteHandler = async (req, res) => {
  try {
    if (Array.isArray(req.body)) {
      // Handle array of parts
      const partsToCreate = req.body.map((part) => ({
        createdAt: new Date(),
        updatedAt: new Date(),
        name: part.name,
        products: part?.products,
        fileName: part?.fileName,
      }));

      const results = await partModel.insertMany(partsToCreate);
      if (!results.length) {
        logger.error("No parts created.");
        return res.status(500).send({ error: "No parts created." });
      }

      // Create audit logs for each new part
      for (const result of results) {
        await newAuditLog(
          {},
          result.toObject(),
          result._id,
          'Part',
          req.user._id,
          'User'
        );
      }

      return res.status(200).send(results);
    } else {
      // Handle single part
      const newPart = {
        createdAt: new Date(),
        updatedAt: new Date(),
        name: req.body.name,
        products: req.body?.products,
        fileName: req.body?.fileName,
      };
      const result = await partModel.create(newPart);

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

      return res.status(200).send(result);
    }
  } catch (error) {
    logger.error("Error creating part(s):", error);
    return res.status(500).send({ error: error.message });
  }
};

export const uploadPartFileContentRouteHandler = async (req, res) => {
  try {
    // Get ID from params
    const id = new mongoose.Types.ObjectId(req.params.id);
    // Fetch the part with the given id
    const part = await partModel.findOne({ _id: id });
    if (!part) {
      // Error handling
      logger.warn(`Part not found with supplied id.`);
      return res.status(404).send({ error: "Print job not found." });
    }
    logger.trace(`Part with ID: ${id}`);
    try {
      partUpload(req, res, async (err) => {
        if (err) {
          res.status(500).send({
            error: err,
          });
        } else {
          if (req.file == undefined) {
            res.send({
              message: "No file selected!",
            });
          } else {
            res.send({
              status: "OK",
              file: `${req.file.filename}`,
            });
          }
        }
      });
    } catch (updateError) {
      logger.error("Error updating part:", updateError);
      res.status(500).send({ error: updateError.message });
    }
  } catch (fetchError) {
    logger.error("Error fetching part:", fetchError);
    res.status(500).send({ error: fetchError.message });
  }
};

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

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

    logger.trace(`Returning part file contents with ID: ${id}:`);

    const filePath = path.join(process.env.PART_STORAGE, id + ".stl");

    // Read the file
    fs.readFile(filePath, "utf8", (err, data) => {
      if (err) {
        if (err.code === "ENOENT") {
          // File not found
          return res.status(404).send({ error: "File not found!" });
        } else {
          // Other errors
          return res.status(500).send({ error: "Error reading file." });
        }
      }

      // Send the file contents in the response
      res.send(data);
    });
  } catch (error) {
    logger.error("Error fetching Part:", error);
    res.status(500).send({ error: error.message });
  }
};