const express = require("express");
const router = express.Router();
const { HBCform } = require("../models");
const { Op } = require("sequelize");
const yup = require("yup");
const multer = require("multer");
const sharp = require("sharp");
const { sendThankYouEmail } = require("../connections/mailersend");
const upload = multer({ storage: multer.memoryStorage() });

async function processFile(file) {
  try {
    const { buffer, mimetype } = file;
    const maxSize = 5 * 1024 * 1024; // 5MB limit for compressed image size
    let processedBuffer;

    if (mimetype.startsWith("image/")) {
      // Handle image files
      const metadata = await sharp(buffer).metadata();

      // Compress the image based on its format
      if (metadata.format === "jpeg") {
        processedBuffer = await sharp(buffer)
          .jpeg({ quality: 80 }) // Compress to JPEG
          .toBuffer();
      } else if (metadata.format === "png") {
        processedBuffer = await sharp(buffer)
          .png({ quality: 80 }) // Compress to PNG
          .toBuffer();
      } else if (metadata.format === "webp") {
        processedBuffer = await sharp(buffer)
          .webp({ quality: 80 }) // Compress to WebP
          .toBuffer();
      } else {
        // For other image formats (e.g., TIFF), convert to JPEG
        processedBuffer = await sharp(buffer)
          .toFormat("jpeg")
          .jpeg({ quality: 80 })
          .toBuffer();
      }

      // Check the size of the compressed image
      if (processedBuffer.length > maxSize) {
        throw new Error(
          `Compressed file too large: ${(
            processedBuffer.length / 1000000
          ).toFixed(2)}MB`
        );
      }
    } else if (mimetype === "application/pdf") {
      // Handle PDF files
      console.log("Processing PDF");
      processedBuffer = buffer; // Store the PDF as is
      // Optionally, process PDF using pdf-lib or other libraries
    } else {
      throw new Error(`Unsupported file type: ${mimetype}`);
    }

    return processedBuffer;
  } catch (err) {
    console.error("Error processing file:", err);
    throw err;
  }
}

router.post(
  "/",
  upload.fields([{ name: "billPicture", maxCount: 1 }]),
  async (req, res) => {
    let data = req.body;
    let files = req.files;

    // Validate request body
    let validationSchema = yup.object({
      electricalBill: yup.number().positive().required(),
      waterBill: yup.number().positive().required(),
      totalBill: yup.number().positive().required(),
      noOfDependents: yup.number().integer().positive().required(),
      avgBill: yup.number().positive().required(),
    });

    try {
      data = await validationSchema.validate(data, { abortEarly: false });

      // Process the files
      const processedbillPicture = await processFile(files.billPicture[0]);

      // Save the form with processed files
      let result = await HBCform.create({
        ...data,
        billPicture: processedbillPicture,
      });

      res.json(result);
    } catch (err) {
      console.error("Error processing request:", err);
      res
        .status(400)
        .json({ message: "Bad request", errors: err.errors || err.message });
    }
  }
);

router.get("/", async (req, res) => {
  let condition = {};
  let search = req.query.search;
  if (search) {
    condition[Op.or] = [
      { electricalBill: { [Op.like]: `%${search}%` } },
      { waterBill: { [Op.like]: `%${search}%` } },
      { totalBill: { [Op.like]: `%${search}%` } },
      { noOfDependents: { [Op.like]: `%${search}%` } },
      { avgBill: { [Op.like]: `%${search}%` } },
    ];
  }
  let list = await HBCform.findAll({
    where: condition,
    order: [["createdAt", "ASC"]],
    attributes: { exclude: ["billPicture"] },
  });
  res.json(list);
});

router.get("/:id", async (req, res) => {
  let id = req.params.id;
  let hbcform = await HBCform.findByPk(id);
  if (!hbcform) {
    res.sendStatus(404);
    return;
  }
  res.json(hbcform);
});

router.get("/billPicture/:id", async (req, res) => {
  let id = req.params.id;
  let hbcform = await HBCform.findByPk(id);

  if (!hbcform || !hbcform.billPicture) {
    res.sendStatus(404);
    return;
  }

  try {
    res.set("Content-Type", "image/jpeg"); // Adjust the content type as necessary
    res.send(hbcform.billPicture);
  } catch (err) {
    res
      .status(500)
      .json({ message: "Error retrieving electrical bill", error: err });
  }
});

router.delete("/:id", async (req, res) => {
  let id = req.params.id;
  try {
    const result = await HBCform.destroy({ where: { id } });
    if (result === 0) {
      // No rows were deleted
      res.sendStatus(404);
    } else {
      // Successfully deleted
      res.sendStatus(204);
    }
  } catch (err) {
    console.error("Error deleting form entry:", err);
    res
      .status(500)
      .json({ message: "Failed to delete form entry", error: err });
  }
});

// Endpoint for sending emails related to home bill contest
router.post("/send-homebill-contest-email", async (req, res) => {
  const { email, name } = req.body;
  try {
    await sendThankYouEmail(email, name);
    res.status(200).send({ message: "Email sent successfully" });
  } catch (error) {
    console.error("Failed to send email:", error);
    res.status(500).send({ error: "Failed to send email" });
  }
});

router.get("/has-handed-in-form/:userId", async (req, res) => {
  const userId = req.params.userId;
  try {
    const form = await HBCform.findOne({ where: { userId } });
    if (form) {
      res.json({ hasHandedInForm: true, formId: form.id });
    } else {
      res.json({ hasHandedInForm: false });
    }
  } catch (err) {
    console.error("Error checking if user has handed in form:", err);
    res.status(500).json({
      message: "Failed to check if user has handed in form",
      error: err,
    });
  }
});

router.post("/stringify-image", upload.single("image"), async (req, res) => {
  try {
    console.log("stringifying image..");
    if (!req.file) {
      return res.status(400).send({ error: "No file uploaded" });
    }

    const compressedImageBuffer = await sharp(req.file.buffer)
      .resize(720, 1280)
      .toBuffer();

    const base64Image = compressedImageBuffer.toString("base64");

    console.log("buffered!");

    res.status(200).send({ base64Image });
  } catch (error) {
    console.error("Failed to process image:", error);
    res.status(500).send({ error: "Failed to process image" });
  }
});

module.exports = router;