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

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

export const getAllLevelById = async (req, res) => {
  try {
    const { id } = req.params;
    const level = await models.Level.findByPk(id);

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

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

export const getLevels = async (req, res) => {
  try {
    const levels = await models.Level.findAll({
      attributes: {
        exclude: ["route1", "route2", "route3", "route4"],
      },
    });

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

export const getLevelById = async (req, res) => {
  try {
    const { id } = req.params;
    const level = await models.Level.findByPk(id, {
      attributes: {
        exclude: ["route1", "route2", "route3", "route4"],
      },
    });

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

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

export const createLevel = async (req, res) => {
  const { title, subject_id, topic_id, is_pretest, content, youtube } =
    req.body;

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

  // Validate title
  if (!title) {
    clearFileBuffers({ video, audio, image });
    return response(400, null, "Title is required", res);
  }

  // Validate subject_id
  if (!subject_id) {
    clearFileBuffers({ video, audio, image });
    return response(400, null, "Subject ID is required", res);
  }

  // Validate topic_id
  if (!topic_id) {
    clearFileBuffers({ video, audio, image });
    return response(400, null, "Topic ID is required", res);
  }

  try {
    // Check if the title already exists under the same topic_id
    const existingLevel = await models.Level.findOne({
      where: { title, topic_id },
    });

    if (existingLevel) {
      clearFileBuffers({ video, audio, image });
      return response(
        409,
        null,
        "A level with this title already exists under this topic",
        res
      ); // 409 Conflict
    }

    // Save files to disk
    const videoFilename = video
      ? saveFileToDisk(video, "video", title, topic_id, subject_id)
      : null;
    const audioFilename = audio
      ? saveFileToDisk(audio, "audio", title, topic_id, subject_id)
      : null;
    const imageFilename = image
      ? saveFileToDisk(image, "image", title, topic_id, subject_id)
      : null;

    // Create the new level
    const newLevel = await models.Level.create({
      title,
      subject_id,
      topic_id,
      is_pretest: is_pretest || 0,
      content,
      video: videoFilename,
      audio: audioFilename,
      image: imageFilename,
      youtube,
      route1: 0,
      route2: 0,
      route3: 0,
      route4: 0,
    });

    // Update routes with the newly created level's ID
    await newLevel.update({
      route1: newLevel.id,
      route2: newLevel.id,
      route3: newLevel.id,
      route4: newLevel.id,
    });

    response(201, newLevel, "Level created successfully", res);
  } catch (error) {
    console.log(error);
    clearFileBuffers({ video, audio, image });
    return response(500, null, "Internal Server Error", res);
  }
};

export const updateLevelById = async (req, res) => {
  const { id } = req.params;
  const { title, subject_id, topic_id, is_pretest, content, youtube } =
    req.body;

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

  try {
    // Find the existing level by ID
    const level = await models.Level.findByPk(id);

    if (!level) {
      clearFileBuffers({ video, audio, image });
      return response(404, null, "Level not found", res);
    }

    // Check if a level with the same title under the same topic already exists
    if (title && topic_id) {
      const existingLevel = await models.Level.findOne({
        where: {
          title,
          topic_id,
          id: { [models.Sequelize.Op.ne]: id }, // Exclude the current level from the check
        },
      });

      if (existingLevel) {
        clearFileBuffers({ video, audio, image });
        return response(
          409,
          null,
          "A level with this title already exists under this topic",
          res
        ); // 409 Conflict
      }
    }

    // Update level fields
    if (title) level.title = title;
    if (subject_id) level.subject_id = subject_id;
    if (topic_id) level.topic_id = topic_id;
    if (is_pretest !== undefined) level.is_pretest = is_pretest;
    if (content) level.content = content;
    if (youtube) level.youtube = youtube;

    // Handle video update
    if (video) {
      if (level.video) {
        const oldVideoPath = path.join(
          "public/uploads/level/video",
          level.video
        );
        if (fs.existsSync(oldVideoPath)) {
          fs.unlinkSync(oldVideoPath);
        }
      }
      level.video = saveFileToDisk(
        video,
        "video",
        title || level.title,
        topic_id || level.topic_id,
        subject_id || level.subject_id
      );
    }

    // Handle audio update
    if (audio) {
      if (level.audio) {
        const oldAudioPath = path.join(
          "public/uploads/level/audio",
          level.audio
        );
        if (fs.existsSync(oldAudioPath)) {
          fs.unlinkSync(oldAudioPath);
        }
      }
      level.audio = saveFileToDisk(
        audio,
        "audio",
        title || level.title,
        topic_id || level.topic_id,
        subject_id || level.subject_id
      );
    }

    // Handle image update
    if (image) {
      if (level.image) {
        const oldImagePath = path.join(
          "public/uploads/level/image",
          level.image
        );
        if (fs.existsSync(oldImagePath)) {
          fs.unlinkSync(oldImagePath);
        }
      }
      level.image = saveFileToDisk(
        image,
        "image",
        title || level.title,
        topic_id || level.topic_id,
        subject_id || level.subject_id
      );
    }

    await level.save();

    response(200, level, "Level updated successfully", res);
  } catch (error) {
    console.log(error);
    clearFileBuffers({ video, audio, image });
    return response(500, null, "Internal Server Error", res);
  }
};

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

  try {
    // Find the existing level by ID
    const level = await models.Level.findByPk(id);

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

    // Delete associated files from disk if they exist
    const deleteFile = (filePath) => {
      if (fs.existsSync(filePath)) {
        fs.unlinkSync(filePath);
      }
    };

    if (level.video) {
      const videoPath = path.join("public/uploads/level/video", level.video);
      deleteFile(videoPath);
    }

    if (level.audio) {
      const audioPath = path.join("public/uploads/level/audio", level.audio);
      deleteFile(audioPath);
    }

    if (level.image) {
      const imagePath = path.join("public/uploads/level/image", level.image);
      deleteFile(imagePath);
    }

    // Delete the level from the database
    await level.destroy();

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

export const getRoutes = async (req, res) => {
  try {
    const levels = await models.Level.findAll({
      attributes: {
        exclude: [
          "subject_id",
          "topic_id",
          "is_pretest",
          "content",
          "video",
          "audio",
          "image",
          "youtube",
          "ts_entri",
        ],
      },
    });

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

export const getRouteById = async (req, res) => {
  try {
    const { id } = req.params;
    const level = await models.Level.findByPk(id, {
      attributes: {
        exclude: [
          "subject_id",
          "topic_id",
          "is_pretest",
          "content",
          "video",
          "audio",
          "image",
          "youtube",
          "ts_entri",
        ],
      },
    });

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

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

export const updateRouteById = async (req, res) => {
  const { id } = req.params;
  const { route1, route2, route3, route4 } = req.body;

  try {
    // Find the existing level by ID
    const level = await models.Level.findByPk(id);

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

    // Update only the route fields
    await level.update({
      route1: route1 !== undefined ? route1 : level.route1,
      route2: route2 !== undefined ? route2 : level.route2,
      route3: route3 !== undefined ? route3 : level.route3,
      route4: route4 !== undefined ? route4 : level.route4,
    });

    response(200, level, "Routes updated successfully", res);
  } catch (error) {
    console.log(error);
    return response(500, null, "Internal Server Error", res);
  }
};