import response from "../response.js";
import models from "../models/index.js";
import fs from "fs";
import path from "path";
import {
  clearFileBuffers,
  saveFileToDisk,
} from "../middlewares/uploadSubject.js";

export const getSubjects = async (req, res) => {
  try {
    const subjects = await models.Subject.findAll();
    response(200, subjects, "Success", res);
  } catch (error) {
    console.log(error);
    response(500, null, "Error retrieving subjects data!", res);
  }
};

export const getSubjectById = async (req, res) => {
  try {
    const { id } = req.params;
    const subject = await models.Subject.findByPk(id);

    if (!subject) {
      return response(404, null, "Subject not found", res);
    }

    response(200, subject, "Success", res);
  } catch (error) {
    console.log(error);
    res.status(500).json({ message: "Internal Server Error" });
  }
};

export const createSubject = async (req, res) => {
  const { name, description } = req.body;

  // Files to be saved if everything else is okay
  const { icon, thumbnail } = req.filesToSave || {};

  // Validate name
  if (!name) {
    clearFileBuffers({ icon, thumbnail });
    return response(400, null, "Name is required", res);
  }

  // Validate description
  if (!description) {
    clearFileBuffers({ icon, thumbnail });
    return response(400, null, "Description is required", res);
  }

  try {
    const iconFilename = icon
      ? saveFileToDisk(icon, `${name}-icon`, name)
      : null;
    const thumbnailFilename = thumbnail
      ? saveFileToDisk(thumbnail, `${name}-thumbnail`, name)
      : null;

    const newSubject = await models.Subject.create({
      name,
      description,
      icon: iconFilename,
      thumbnail: thumbnailFilename,
    });

    response(201, newSubject, "Subject created successfully", res);
  } catch (error) {
    console.log(error);
    clearFileBuffers({ icon, thumbnail });
    res.status(500).json({ message: "Internal Server Error" });
  }
};

export const updateSubjectById = async (req, res) => {
  const { id } = req.params;
  const { name, description } = req.body;

  // Files to be saved if everything else is okay
  const { icon, thumbnail } = req.filesToSave || {};

  try {
    const subject = await models.Subject.findByPk(id);

    if (!subject) {
      clearFileBuffers({ icon, thumbnail });
      return response(404, null, "Subject not found", res);
    }

    // Update subject fields
    if (name) subject.name = name;
    if (description) subject.description = description;

    // Handle icon update
    if (icon) {
      if (subject.icon) {
        const oldIconPath = path.join("public/uploads/subject", subject.icon);
        if (fs.existsSync(oldIconPath)) {
          fs.unlinkSync(oldIconPath);
        }
      }
      subject.icon = saveFileToDisk(icon, `${name}-icon`, name);
    }

    // Handle thumbnail update
    if (thumbnail) {
      if (subject.thumbnail) {
        const oldThumbnailPath = path.join(
          "public/uploads/subject",
          subject.thumbnail
        );
        if (fs.existsSync(oldThumbnailPath)) {
          fs.unlinkSync(oldThumbnailPath);
        }
      }
      subject.thumbnail = saveFileToDisk(thumbnail, `${name}-thumbnail`, name);
    }

    await subject.save();

    response(200, subject, "Subject updated successfully", res);
  } catch (error) {
    console.log(error);
    clearFileBuffers({ icon, thumbnail });
    response(500, null, "Internal Server Error", res);
  }
};

export const deleteSubjectById = async (req, res) => {
  const { id } = req.params;

  try {
    const subject = await models.Subject.findByPk(id);

    if (!subject) {
      return response(404, null, "Subject not found", res);
    }

    // Remove associated icon if it exists
    if (subject.icon) {
      const iconPath = path.join("public/uploads/subject", subject.icon);
      if (fs.existsSync(iconPath)) {
        fs.unlinkSync(iconPath);
      }
    }

    // Remove associated thumbnail if it exists
    if (subject.thumbnail) {
      const thumbnailPath = path.join(
        "public/uploads/subject",
        subject.thumbnail
      );
      if (fs.existsSync(thumbnailPath)) {
        fs.unlinkSync(thumbnailPath);
      }
    }

    await subject.destroy();

    response(200, null, "Subject deleted successfully", res);
  } catch (error) {
    console.log(error);
    response(500, null, "Internal Server Error", res);
  }
};